diff --git a/doric-android/doric/src/main/java/pub/doric/shader/ScrollerNode.java b/doric-android/doric/src/main/java/pub/doric/shader/ScrollerNode.java index 18ccf135..b7b1d236 100644 --- a/doric-android/doric/src/main/java/pub/doric/shader/ScrollerNode.java +++ b/doric-android/doric/src/main/java/pub/doric/shader/ScrollerNode.java @@ -21,7 +21,7 @@ import com.github.pengfeizhou.jscore.JSValue; import pub.doric.DoricContext; import pub.doric.extension.bridge.DoricPlugin; -import pub.doric.widget.HVScrollView; +import pub.doric.widget.NewHVScrollView; /** * @Description: pub.doric.shader @@ -29,7 +29,7 @@ import pub.doric.widget.HVScrollView; * @CreateDate: 2019-11-18 */ @DoricPlugin(name = "Scroller") -public class ScrollerNode extends SuperNode { +public class ScrollerNode extends SuperNode { private String mChildViewId; private ViewNode mChildNode; @@ -50,12 +50,12 @@ public class ScrollerNode extends SuperNode { } @Override - protected HVScrollView build() { - return new HVScrollView(getContext()); + protected NewHVScrollView build() { + return new NewHVScrollView(getContext()); } @Override - protected void blend(HVScrollView view, String name, JSValue prop) { + protected void blend(NewHVScrollView view, String name, JSValue prop) { if ("content".equals(name)) { mChildViewId = prop.asString().value(); } else { diff --git a/doric-android/doric/src/main/java/pub/doric/widget/HVScrollView.java b/doric-android/doric/src/main/java/pub/doric/widget/HVScrollView.java index 8c3bdcdb..82456d55 100644 --- a/doric-android/doric/src/main/java/pub/doric/widget/HVScrollView.java +++ b/doric-android/doric/src/main/java/pub/doric/widget/HVScrollView.java @@ -1,9 +1,25 @@ +/* + * Copyright [2019] [Doric.Pub] + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ package pub.doric.widget; + import android.content.Context; +import android.content.res.TypedArray; import android.graphics.Canvas; import android.graphics.Rect; -import android.os.Build; import android.os.Bundle; import android.os.Parcel; import android.os.Parcelable; @@ -20,51 +36,44 @@ import android.view.ViewGroup; import android.view.ViewParent; import android.view.accessibility.AccessibilityEvent; import android.view.animation.AnimationUtils; +import android.widget.EdgeEffect; +import android.widget.FrameLayout; +import android.widget.OverScroller; import android.widget.ScrollView; +import androidx.annotation.RestrictTo; import androidx.core.view.AccessibilityDelegateCompat; import androidx.core.view.InputDeviceCompat; -import androidx.core.view.MotionEventCompat; -import androidx.core.view.NestedScrollingChild; +import androidx.core.view.NestedScrollingChild2; import androidx.core.view.NestedScrollingChildHelper; import androidx.core.view.NestedScrollingParent; import androidx.core.view.NestedScrollingParentHelper; import androidx.core.view.ScrollingView; -import androidx.core.view.VelocityTrackerCompat; import androidx.core.view.ViewCompat; -import androidx.core.view.accessibility.AccessibilityEventCompat; import androidx.core.view.accessibility.AccessibilityNodeInfoCompat; import androidx.core.view.accessibility.AccessibilityRecordCompat; import androidx.core.widget.EdgeEffectCompat; -import androidx.core.widget.ScrollerCompat; import java.util.List; -public class HVScrollView extends ViewGroup implements NestedScrollingParent, - NestedScrollingChild, ScrollingView { - private boolean DEBUG = false; +/** + * NestedScrollView is just like {@link android.widget.ScrollView}, but it supports acting + * as both a nested scrolling parent and child on both new and old versions of Android. + * Nested scrolling is enabled by default. + */ +public class HVScrollView extends FrameLayout implements NestedScrollingParent, + NestedScrollingChild2, ScrollingView { static final int ANIMATED_SCROLL_GAP = 250; static final float MAX_SCROLL_FACTOR = 0.5f; private static final String TAG = "NestedScrollView"; - private boolean mChildLayoutCenter; - private int mInitialTouchY; - private int mInitialTouchX; -// private boolean mIsBeingDragged; - - public void setChildLayoutCenter(boolean childLayoutCenter) { - if (mChildLayoutCenter != childLayoutCenter) { - this.mChildLayoutCenter = childLayoutCenter; - requestLayout(); - } - } /** * Interface definition for a callback to be invoked when the scroll * X or Y positions of a view change. *

- * This version of the interface works on all versions of Android, back to API v4. + *

This version of the interface works on all versions of Android, back to API v4.

* * @see #setOnScrollChangeListener(OnScrollChangeListener) */ @@ -85,18 +94,20 @@ public class HVScrollView extends ViewGroup implements NestedScrollingParent, private long mLastScroll; private final Rect mTempRect = new Rect(); - private ScrollerCompat mScroller; - private EdgeEffectCompat mEdgeGlowTop; - private EdgeEffectCompat mEdgeGlowBottom; - private EdgeEffectCompat mEdgeGlowLeft; - private EdgeEffectCompat mEdgeGlowRight; + private OverScroller mScroller; + private EdgeEffect mEdgeGlowTop; + private EdgeEffect mEdgeGlowBottom; + private EdgeEffect mEdgeGlowLeft; + private EdgeEffect mEdgeGlowRight; + private int scrollModeFlag = 0; + public static final int DISABLE_VERTICAL_SCROLL = 1; + public static final int DISABLE_HORIZONTAL_SCROLL = 2; /** * Position of the last motion event. */ - private int mLastMotionY; - private int mLastMotionX; + private int mLastMotionY; /** * True when the layout has changed but the traversal has not come through yet. @@ -112,32 +123,12 @@ public class HVScrollView extends ViewGroup implements NestedScrollingParent, */ private View mChildToScrollTo = null; -// /** -// * True if the user is currently dragging this ScrollView around. This is -// * not the same as 'is being flinged', which can be checked by -// * mScroller.isFinished() (flinging begins when the user lifts his finger). -// */ -// private boolean mIsBeingDragged = false; - /** - * The RecyclerView is not currently scrolling. + * True if the user is currently dragging this ScrollView around. This is + * not the same as 'is being flinged', which can be checked by + * mScroller.isFinished() (flinging begins when the user lifts his finger). */ - public static final int SCROLL_STATE_IDLE = 0; - - /** - * The RecyclerView is currently being dragged by outside input such as user touch input. - */ - public static final int SCROLL_STATE_DRAGGING = 1; - - /** - * The RecyclerView is currently animating to a final position while not under - * outside control. - */ - public static final int SCROLL_STATE_SETTLING = 2; - - // Touch/scrolling handling - - private int mScrollState = SCROLL_STATE_IDLE; + private boolean mIsBeingDragged = false; /** * Determines speed during touch scrolling @@ -164,8 +155,11 @@ public class HVScrollView extends ViewGroup implements NestedScrollingParent, */ private final int[] mScrollOffset = new int[2]; private final int[] mScrollConsumed = new int[2]; - private int mNestedYOffset; private int mNestedXOffset; + private int mNestedYOffset; + + private int mLastScrollerX; + private int mLastScrollerY; /** * Sentinel value for no current active pointer. @@ -177,12 +171,15 @@ public class HVScrollView extends ViewGroup implements NestedScrollingParent, private static final AccessibilityDelegate ACCESSIBILITY_DELEGATE = new AccessibilityDelegate(); - private boolean mFillViewportH; - private boolean mFillViewportV; + private static final int[] SCROLLVIEW_STYLEABLE = new int[]{ + android.R.attr.fillViewport + }; + private final NestedScrollingParentHelper mParentHelper; private final NestedScrollingChildHelper mChildHelper; private float mVerticalScrollFactor; + private float mHorizontalScrollFactor; private OnScrollChangeListener mOnScrollChangeListener; @@ -194,29 +191,13 @@ public class HVScrollView extends ViewGroup implements NestedScrollingParent, this(context, attrs, 0); } - public static final int SCROLL_ORIENTATION_NONE = 0; - public static final int SCROLL_ORIENTATION_HORIZONTAL = 1; - public static final int SCROLL_ORIENTATION_VERTICAL = 2; - public static final int SCROLL_ORIENTATION_BOTH = 3; - private int mScrollOrientation; - - public void setScrollOrientation(int scrollOrientation) { - this.mScrollOrientation = scrollOrientation; - requestLayout(); - } - - public int getScrollOrientation() { - return mScrollOrientation; - } - public HVScrollView(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); initScrollView(); - mChildLayoutCenter = false; - mFillViewportH = true; - mFillViewportV = false; - mScrollOrientation = SCROLL_ORIENTATION_BOTH; + final TypedArray a = context.obtainStyledAttributes( + attrs, SCROLLVIEW_STYLEABLE, defStyleAttr, 0); + a.recycle(); mParentHelper = new NestedScrollingParentHelper(this); mChildHelper = new NestedScrollingChildHelper(this); @@ -244,16 +225,31 @@ public class HVScrollView extends ViewGroup implements NestedScrollingParent, return mChildHelper.startNestedScroll(axes); } + @Override + public boolean startNestedScroll(int axes, int type) { + return mChildHelper.startNestedScroll(axes, type); + } + @Override public void stopNestedScroll() { mChildHelper.stopNestedScroll(); } + @Override + public void stopNestedScroll(int type) { + mChildHelper.stopNestedScroll(type); + } + @Override public boolean hasNestedScrollingParent() { return mChildHelper.hasNestedScrollingParent(); } + @Override + public boolean hasNestedScrollingParent(int type) { + return mChildHelper.hasNestedScrollingParent(type); + } + @Override public boolean dispatchNestedScroll(int dxConsumed, int dyConsumed, int dxUnconsumed, int dyUnconsumed, int[] offsetInWindow) { @@ -261,11 +257,24 @@ public class HVScrollView extends ViewGroup implements NestedScrollingParent, offsetInWindow); } + @Override + public boolean dispatchNestedScroll(int dxConsumed, int dyConsumed, int dxUnconsumed, + int dyUnconsumed, int[] offsetInWindow, int type) { + return mChildHelper.dispatchNestedScroll(dxConsumed, dyConsumed, dxUnconsumed, dyUnconsumed, + offsetInWindow, type); + } + @Override public boolean dispatchNestedPreScroll(int dx, int dy, int[] consumed, int[] offsetInWindow) { return mChildHelper.dispatchNestedPreScroll(dx, dy, consumed, offsetInWindow); } + @Override + public boolean dispatchNestedPreScroll(int dx, int dy, int[] consumed, int[] offsetInWindow, + int type) { + return mChildHelper.dispatchNestedPreScroll(dx, dy, consumed, offsetInWindow, type); + } + @Override public boolean dispatchNestedFling(float velocityX, float velocityY, boolean consumed) { return mChildHelper.dispatchNestedFling(velocityX, velocityY, consumed); @@ -280,16 +289,14 @@ public class HVScrollView extends ViewGroup implements NestedScrollingParent, @Override public boolean onStartNestedScroll(View child, View target, int nestedScrollAxes) { - return ((nestedScrollAxes & ViewCompat.SCROLL_AXIS_VERTICAL) != 0 && canScrollVertically()) || ((nestedScrollAxes & ViewCompat.SCROLL_AXIS_HORIZONTAL) != 0 && canScrollHorizontally()); + return (nestedScrollAxes & ViewCompat.SCROLL_AXIS_VERTICAL) != 0 + || (nestedScrollAxes & ViewCompat.SCROLL_AXIS_HORIZONTAL) != 0; } @Override public void onNestedScrollAccepted(View child, View target, int nestedScrollAxes) { mParentHelper.onNestedScrollAccepted(child, target, nestedScrollAxes); - int axes = ViewCompat.SCROLL_AXIS_NONE; - axes = canScrollHorizontally() ? axes | ViewCompat.SCROLL_AXIS_HORIZONTAL : axes; - axes = canScrollVertically() ? axes | ViewCompat.SCROLL_AXIS_VERTICAL : axes; - startNestedScroll(axes); + startNestedScroll(nestedScrollAxes); } @Override @@ -298,25 +305,16 @@ public class HVScrollView extends ViewGroup implements NestedScrollingParent, stopNestedScroll(); } - public boolean canScrollHorizontally() { - return (mScrollOrientation & SCROLL_ORIENTATION_HORIZONTAL) == SCROLL_ORIENTATION_HORIZONTAL; - } - - public boolean canScrollVertically() { - return (mScrollOrientation & SCROLL_ORIENTATION_VERTICAL) == SCROLL_ORIENTATION_VERTICAL; - } - - @Override public void onNestedScroll(View target, int dxConsumed, int dyConsumed, int dxUnconsumed, int dyUnconsumed) { - final int oldScrollY = getScrollY(); final int oldScrollX = getScrollX(); - scrollBy(canScrollHorizontally() ? dxUnconsumed : 0, canScrollVertically() ? dyUnconsumed : 0); - final int myConsumedY = getScrollY() - oldScrollY; + final int oldScrollY = getScrollY(); + scrollBy(dxUnconsumed, dyUnconsumed); final int myConsumedX = getScrollX() - oldScrollX; - final int myUnconsumedY = dyUnconsumed - myConsumedY; final int myUnconsumedX = dxUnconsumed - myConsumedX; + final int myConsumedY = getScrollY() - oldScrollY; + final int myUnconsumedY = dyUnconsumed - myConsumedY; dispatchNestedScroll(myConsumedX, myConsumedY, myUnconsumedX, myUnconsumedY, null); } @@ -328,7 +326,7 @@ public class HVScrollView extends ViewGroup implements NestedScrollingParent, @Override public boolean onNestedFling(View target, float velocityX, float velocityY, boolean consumed) { if (!consumed) { - fling((int) velocityX, (int) velocityY); + flingWithNestedDispatch((int) velocityX, (int) velocityY); return true; } return false; @@ -346,27 +344,14 @@ public class HVScrollView extends ViewGroup implements NestedScrollingParent, // ScrollView import + @Override public boolean shouldDelayChildPressedState() { return true; } - @Override - protected float getLeftFadingEdgeStrength() { - if (getChildCount() == 0 || !canScrollHorizontally()) { - return 0.0f; - } - - final int length = getHorizontalFadingEdgeLength(); - final int scrollX = getScrollX(); - if (scrollX < length) { - return scrollX / (float) length; - } - return 1.0f; - } - @Override protected float getTopFadingEdgeStrength() { - if (getChildCount() == 0 || !canScrollVertically()) { + if (getChildCount() == 0) { return 0.0f; } @@ -375,12 +360,13 @@ public class HVScrollView extends ViewGroup implements NestedScrollingParent, if (scrollY < length) { return scrollY / (float) length; } + return 1.0f; } @Override protected float getBottomFadingEdgeStrength() { - if (getChildCount() == 0 || !canScrollVertically()) { + if (getChildCount() == 0) { return 0.0f; } @@ -394,15 +380,30 @@ public class HVScrollView extends ViewGroup implements NestedScrollingParent, return 1.0f; } + @Override + protected float getLeftFadingEdgeStrength() { + if (getChildCount() == 0) { + return 0.0f; + } + + final int length = getHorizontalFadingEdgeLength(); + final int scrollX = getScrollX(); + if (scrollX < length) { + return scrollX / (float) length; + } + + return 1.0f; + } + @Override protected float getRightFadingEdgeStrength() { - if (getChildCount() == 0 || !canScrollHorizontally()) { + if (getChildCount() == 0) { return 0.0f; } final int length = getHorizontalFadingEdgeLength(); final int rightEdge = getWidth() - getPaddingRight(); - final int span = getChildAt(0).getRight() - getScrollX() - rightEdge; + final int span = getChildAt(0).getRight() - getScrollY() - rightEdge; if (span < length) { return span / (float) length; } @@ -414,16 +415,12 @@ public class HVScrollView extends ViewGroup implements NestedScrollingParent, * @return The maximum amount this scroll view will scroll in response to * an arrow event. */ - public int getMaxScrollAmountY() { + public int getMaxScrollAmount() { return (int) (MAX_SCROLL_FACTOR * getHeight()); } - public int getMaxScrollAmountX() { - return (int) (MAX_SCROLL_FACTOR * getWidth()); - } - private void initScrollView() { - mScroller = ScrollerCompat.create(getContext(), null); + mScroller = new OverScroller(getContext()); setFocusable(true); setDescendantFocusability(FOCUS_AFTER_DESCENDANTS); setWillNotDraw(false); @@ -452,7 +449,7 @@ public class HVScrollView extends ViewGroup implements NestedScrollingParent, } @Override - public void addView(View child, LayoutParams params) { + public void addView(View child, ViewGroup.LayoutParams params) { if (getChildCount() > 0) { throw new IllegalStateException("ScrollView can host only one direct child"); } @@ -461,7 +458,7 @@ public class HVScrollView extends ViewGroup implements NestedScrollingParent, } @Override - public void addView(View child, int index, LayoutParams params) { + public void addView(View child, int index, ViewGroup.LayoutParams params) { if (getChildCount() > 0) { throw new IllegalStateException("ScrollView can host only one direct child"); } @@ -472,11 +469,11 @@ public class HVScrollView extends ViewGroup implements NestedScrollingParent, /** * Register a callback to be invoked when the scroll X or Y positions of * this view change. - * This version of the method works on all versions of Android, back to API v4. + *

This version of the method works on all versions of Android, back to API v4.

* * @param l The listener to notify when the scroll X or Y position changes. - * @see View#getScrollX() - * @see View#getScrollY() + * @see android.view.View#getScrollX() + * @see android.view.View#getScrollY() */ public void setOnScrollChangeListener(OnScrollChangeListener l) { mOnScrollChangeListener = l; @@ -486,15 +483,23 @@ public class HVScrollView extends ViewGroup implements NestedScrollingParent, * @return Returns true this ScrollView can be scrolled */ private boolean canScroll() { + return canScrollHorizontally() || canScrollVertically(); + } + + private boolean canScrollVertically() { View child = getChildAt(0); if (child != null) { int childHeight = child.getHeight(); + return getHeight() < childHeight + getPaddingTop() + getPaddingBottom(); + } + return false; + } + + private boolean canScrollHorizontally() { + View child = getChildAt(0); + if (child != null) { int childWidth = child.getWidth(); - boolean canY = getHeight() < childHeight + getPaddingTop() + getPaddingBottom(); - canY |= canScrollVertically(); - boolean canX = getWidth() < childWidth + getPaddingLeft() + getPaddingRight(); - canX |= canScrollHorizontally(); - return canX || canY; + return getWidth() < childWidth + getPaddingLeft() + getPaddingRight(); } return false; } @@ -524,6 +529,48 @@ public class HVScrollView extends ViewGroup implements NestedScrollingParent, } } + @Override + protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { + super.onMeasure(widthMeasureSpec, heightMeasureSpec); + + final int widthMode = MeasureSpec.getMode(widthMeasureSpec); + final int heightMode = MeasureSpec.getMode(heightMeasureSpec); + if (heightMode == MeasureSpec.UNSPECIFIED && widthMode == MeasureSpec.UNSPECIFIED) { + return; + } + + if (getChildCount() > 0) { + final View child = getChildAt(0); + int width = getMeasuredWidth(); + int height = getMeasuredHeight(); + width -= getPaddingLeft(); + width -= getPaddingRight(); + height -= getPaddingTop(); + height -= getPaddingBottom(); + int childWidthMeasureSpec; + int childHeightMeasureSpec; + final FrameLayout.LayoutParams lp = (LayoutParams) child.getLayoutParams(); + if (lp.width != ViewGroup.LayoutParams.MATCH_PARENT && lp.height != ViewGroup.LayoutParams.MATCH_PARENT) { + return; + } + if (child.getMeasuredWidth() < width && lp.width == ViewGroup.LayoutParams.MATCH_PARENT) { + childWidthMeasureSpec = MeasureSpec.makeMeasureSpec(width, MeasureSpec.EXACTLY); + } else { + widthMeasureSpec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED); + childWidthMeasureSpec = getChildMeasureSpec(widthMeasureSpec, + getPaddingLeft() + getPaddingRight(), lp.width); + } + if (child.getMeasuredHeight() < height && lp.height == ViewGroup.LayoutParams.MATCH_PARENT) { + childHeightMeasureSpec = MeasureSpec.makeMeasureSpec(height, MeasureSpec.EXACTLY); + } else { + heightMeasureSpec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED); + childHeightMeasureSpec = getChildMeasureSpec(heightMeasureSpec, + getPaddingTop() + getPaddingBottom(), lp.height); + } + child.measure(childWidthMeasureSpec, childHeightMeasureSpec); + } + } + @Override public boolean dispatchKeyEvent(KeyEvent event) { // Let the focused view and/or our descendants get the key first @@ -558,47 +605,21 @@ public class HVScrollView extends ViewGroup implements NestedScrollingParent, if (event.getAction() == KeyEvent.ACTION_DOWN) { switch (event.getKeyCode()) { case KeyEvent.KEYCODE_DPAD_UP: - if (canScrollVertically()) { - if (!event.isAltPressed()) { - handled = arrowScrollVertically(View.FOCUS_UP); - } else { - handled = fullScrollVertically(View.FOCUS_UP); - } + if (!event.isAltPressed()) { + handled = arrowScroll(View.FOCUS_UP); + } else { + handled = fullScroll(View.FOCUS_UP); } break; case KeyEvent.KEYCODE_DPAD_DOWN: - if (canScrollVertically()) { - if (!event.isAltPressed()) { - handled = arrowScrollVertically(View.FOCUS_DOWN); - } else { - handled = fullScrollVertically(View.FOCUS_DOWN); - } - } - break; - case KeyEvent.KEYCODE_DPAD_LEFT: - if (canScrollHorizontally()) { - if (!event.isAltPressed()) { - handled = arrowScrollHorizontally(View.FOCUS_LEFT); - } else { - handled = fullScrollHorizontally(View.FOCUS_LEFT); - } - } - break; - case KeyEvent.KEYCODE_DPAD_RIGHT: - if (canScrollHorizontally()) { - if (!event.isAltPressed()) { - handled = arrowScrollHorizontally(View.FOCUS_DOWN); - } else { - handled = fullScrollHorizontally(View.FOCUS_DOWN); - } + if (!event.isAltPressed()) { + handled = arrowScroll(View.FOCUS_DOWN); + } else { + handled = fullScroll(View.FOCUS_DOWN); } break; case KeyEvent.KEYCODE_SPACE: - if (canScrollHorizontally()) { - pageScrollHorizontally(event.isShiftPressed() ? View.FOCUS_UP : View.FOCUS_DOWN); - } else if (canScrollVertically()) { - pageScrollVertically(event.isShiftPressed() ? View.FOCUS_UP : View.FOCUS_DOWN); - } + pageScroll(event.isShiftPressed() ? View.FOCUS_UP : View.FOCUS_DOWN); break; } } @@ -609,11 +630,12 @@ public class HVScrollView extends ViewGroup implements NestedScrollingParent, private boolean inChild(int x, int y) { if (getChildCount() > 0) { final int scrollY = getScrollY(); + final int scrollX = getScrollX(); final View child = getChildAt(0); return !(y < child.getTop() - scrollY || y >= child.getBottom() - scrollY - || x < child.getLeft() - || x >= child.getRight()); + || x < child.getLeft() - scrollX + || x >= child.getRight() - scrollX); } return false; } @@ -647,41 +669,9 @@ public class HVScrollView extends ViewGroup implements NestedScrollingParent, super.requestDisallowInterceptTouchEvent(disallowIntercept); } - private void setScrollState(int state) { - if (state == mScrollState) { - return; - } - if (DEBUG) { - Log.d(TAG, "setting scroll state to " + state + " from " + mScrollState, - new Exception()); - } - mScrollState = state; - if (state != SCROLL_STATE_SETTLING) { -// stopScrollersInternal(); - } -// dispatchOnScrollStateChanged(state); - } - - private void cancelTouch() { - resetTouch(); - setScrollState(SCROLL_STATE_IDLE); - } - - private void resetTouch() { - recycleVelocityTracker(); - stopNestedScroll(); - releaseGlows(); - } - - private void releaseGlows() { - boolean needsInvalidate = false; - if (mEdgeGlowLeft != null) needsInvalidate = mEdgeGlowLeft.onRelease(); - if (mEdgeGlowTop != null) needsInvalidate |= mEdgeGlowTop.onRelease(); - if (mEdgeGlowRight != null) needsInvalidate |= mEdgeGlowRight.onRelease(); - if (mEdgeGlowBottom != null) needsInvalidate |= mEdgeGlowBottom.onRelease(); - if (needsInvalidate) { - ViewCompat.postInvalidateOnAnimation(this); - } + @Override + public boolean dispatchTouchEvent(MotionEvent ev) { + return super.dispatchTouchEvent(ev); } @Override @@ -697,23 +687,12 @@ public class HVScrollView extends ViewGroup implements NestedScrollingParent, * state and he is moving his finger. We want to intercept this * motion. */ - - final int action = ev.getAction(); -// if ((action == MotionEvent.ACTION_MOVE) && (mIsBeingDragged)) { -// return true; -// } - - if (action == MotionEvent.ACTION_MOVE && mScrollState == SCROLL_STATE_DRAGGING) { + if ((action == MotionEvent.ACTION_MOVE) && (mIsBeingDragged)) { return true; } - setScrollState(SCROLL_STATE_IDLE); - - final boolean canScrollHorizontally = canScrollHorizontally(); - final boolean canScrollVertically = canScrollVertically(); - - switch (action & MotionEventCompat.ACTION_MASK) { + switch (action & MotionEvent.ACTION_MASK) { case MotionEvent.ACTION_MOVE: { /* * mIsBeingDragged == false, otherwise the shortcut would have caught it. Check @@ -730,58 +709,54 @@ public class HVScrollView extends ViewGroup implements NestedScrollingParent, break; } - final int pointerIndex = MotionEventCompat.findPointerIndex(ev, activePointerId); + final int pointerIndex = ev.findPointerIndex(activePointerId); if (pointerIndex == -1) { Log.e(TAG, "Invalid pointerId=" + activePointerId + " in onInterceptTouchEvent"); break; } - final int y = (int) MotionEventCompat.getY(ev, pointerIndex); - final int x = (int) MotionEventCompat.getX(ev, pointerIndex); - if (mScrollState != SCROLL_STATE_DRAGGING) { - final int dx = x - mInitialTouchX; - final int dy = y - mInitialTouchY; - boolean startScroll = false; - if (canScrollHorizontally && Math.abs(dx) > mTouchSlop) { - mLastMotionX = mInitialTouchX + mTouchSlop * (dx < 0 ? -1 : 1); - startScroll = true; - } - if (canScrollVertically && Math.abs(dy) > mTouchSlop) { - mLastMotionY = mInitialTouchY + mTouchSlop * (dy < 0 ? -1 : 1); - startScroll = true; - } + final int x = (int) ev.getX(pointerIndex); + final int y = (int) ev.getY(pointerIndex); + final int xDiff = Math.abs(x - mLastMotionX); + final int yDiff = Math.abs(y - mLastMotionY); + if ((xDiff > mTouchSlop + && (getNestedScrollAxes() & ViewCompat.SCROLL_AXIS_HORIZONTAL) == 0 + && canScrollHorizontally()) + || (yDiff > mTouchSlop + && (getNestedScrollAxes() & ViewCompat.SCROLL_AXIS_VERTICAL) == 0 + && canScrollVertically())) { + mIsBeingDragged = true; + mLastMotionX = x; + mLastMotionY = y; initVelocityTrackerIfNotExists(); mVelocityTracker.addMovement(ev); + mNestedXOffset = 0; mNestedYOffset = 0; - if (startScroll) { -// mIsBeingDragged = true; - setScrollState(SCROLL_STATE_DRAGGING); + final ViewParent parent = getParent(); + if (parent != null) { + parent.requestDisallowInterceptTouchEvent(true); } } break; } case MotionEvent.ACTION_DOWN: { - final int y = (int) ev.getY(); final int x = (int) ev.getX(); + final int y = (int) ev.getY(); if (!inChild(x, y)) { - setScrollState(SCROLL_STATE_IDLE); + mIsBeingDragged = false; recycleVelocityTracker(); break; } - /* * Remember location of down touch. * ACTION_DOWN always refers to pointer index 0. */ - mLastMotionY = y; mLastMotionX = x; - mInitialTouchY = mLastMotionY; - mInitialTouchX = mLastMotionX; - - mActivePointerId = MotionEventCompat.getPointerId(ev, 0); + mLastMotionY = y; + mActivePointerId = ev.getPointerId(0); initOrResetVelocityTracker(); mVelocityTracker.addMovement(ev); @@ -792,38 +767,24 @@ public class HVScrollView extends ViewGroup implements NestedScrollingParent, * isFinished() is correct. */ mScroller.computeScrollOffset(); -// mIsBeingDragged = !mScroller.isFinished(); - - if (mScrollState == SCROLL_STATE_SETTLING) { - getParent().requestDisallowInterceptTouchEvent(true); - setScrollState(SCROLL_STATE_DRAGGING); - } - int nestedScrollAxis = ViewCompat.SCROLL_AXIS_NONE; - if (canScrollHorizontally) { - nestedScrollAxis |= ViewCompat.SCROLL_AXIS_HORIZONTAL; - } - if (canScrollVertically) { - nestedScrollAxis |= ViewCompat.SCROLL_AXIS_VERTICAL; - } - startNestedScroll(nestedScrollAxis); + mIsBeingDragged = !mScroller.isFinished(); + int axes = getAxes(); + startNestedScroll(axes, ViewCompat.TYPE_TOUCH); break; } case MotionEvent.ACTION_CANCEL: -// mIsBeingDragged = false; - cancelTouch(); - break; case MotionEvent.ACTION_UP: /* Release the drag */ -// mIsBeingDragged = false; -// mActivePointerId = INVALID_POINTER; + mIsBeingDragged = false; + mActivePointerId = INVALID_POINTER; recycleVelocityTracker(); -// if (mScroller.springBack(getScrollX(), getScrollY(), 0, getScrollRangeX(), 0, getScrollRangeY())) { -// ViewCompat.postInvalidateOnAnimation(this); -// } - stopNestedScroll(); + if (mScroller.springBack(getScrollX(), getScrollY(), 0, getScrollRangeX(), 0, getScrollRangeY())) { + ViewCompat.postInvalidateOnAnimation(this); + } + stopNestedScroll(ViewCompat.TYPE_TOUCH); break; - case MotionEventCompat.ACTION_POINTER_UP: + case MotionEvent.ACTION_POINTER_UP: onSecondaryPointerUp(ev); break; } @@ -832,29 +793,34 @@ public class HVScrollView extends ViewGroup implements NestedScrollingParent, * The only time we want to intercept motion events is if we are in the * drag mode. */ - return false; + return mIsBeingDragged; } @Override public boolean onTouchEvent(MotionEvent ev) { - initVelocityTrackerIfNotExists(); MotionEvent vtev = MotionEvent.obtain(ev); - final boolean canScrollHorizontally = canScrollHorizontally(); - final boolean canScrollVertically = canScrollVertically(); - - final int actionMasked = MotionEventCompat.getActionMasked(ev); + final int actionMasked = ev.getActionMasked(); if (actionMasked == MotionEvent.ACTION_DOWN) { - mNestedYOffset = 0; mNestedXOffset = 0; + mNestedYOffset = 0; } vtev.offsetLocation(mNestedXOffset, mNestedYOffset); switch (actionMasked) { case MotionEvent.ACTION_DOWN: { + if (getChildCount() == 0) { + return false; + } + if ((mIsBeingDragged = !mScroller.isFinished())) { + final ViewParent parent = getParent(); + if (parent != null) { + parent.requestDisallowInterceptTouchEvent(true); + } + } /* * If being flinged and user touches, stop the fling. isFinished @@ -865,137 +831,116 @@ public class HVScrollView extends ViewGroup implements NestedScrollingParent, } // Remember where the motion event started - mInitialTouchX = mLastMotionY = (int) ev.getY(); - mInitialTouchY = mLastMotionX = (int) ev.getX(); - mActivePointerId = MotionEventCompat.getPointerId(ev, 0); - - int nestedScrollAxis = ViewCompat.SCROLL_AXIS_NONE; - if (canScrollHorizontally) { - nestedScrollAxis |= ViewCompat.SCROLL_AXIS_HORIZONTAL; - } - if (canScrollVertically) { - nestedScrollAxis |= ViewCompat.SCROLL_AXIS_VERTICAL; - } - startNestedScroll(nestedScrollAxis); + mLastMotionX = (int) ev.getX(); + mLastMotionY = (int) ev.getY(); + mActivePointerId = ev.getPointerId(0); + int axes = getAxes(); + startNestedScroll(axes, ViewCompat.TYPE_TOUCH); break; } case MotionEvent.ACTION_MOVE: - final int activePointerIndex = MotionEventCompat.findPointerIndex(ev, - mActivePointerId); + final int activePointerIndex = ev.findPointerIndex(mActivePointerId); if (activePointerIndex == -1) { Log.e(TAG, "Invalid pointerId=" + mActivePointerId + " in onTouchEvent"); - return false; + break; } - final int y = (int) MotionEventCompat.getY(ev, activePointerIndex); - final int x = (int) MotionEventCompat.getX(ev, activePointerIndex); - int dy = mLastMotionY - y; - int dx = mLastMotionX - x; - if (dispatchNestedPreScroll(dx, dy, mScrollConsumed, mScrollOffset)) { - dy -= mScrollConsumed[1]; - dx -= mScrollConsumed[0]; + final int x = (int) ev.getX(activePointerIndex); + final int y = (int) ev.getY(activePointerIndex); + int deltaX = mLastMotionX - x; + int deltaY = mLastMotionY - y; + if (dispatchNestedPreScroll(deltaX, deltaY, mScrollConsumed, mScrollOffset, + ViewCompat.TYPE_TOUCH)) { + deltaX -= mScrollConsumed[0]; + deltaY -= mScrollConsumed[1]; vtev.offsetLocation(mScrollOffset[0], mScrollOffset[1]); - mNestedYOffset += mScrollOffset[1]; mNestedXOffset += mScrollOffset[0]; + mNestedYOffset += mScrollOffset[1]; } - - if (mScrollState != SCROLL_STATE_DRAGGING) { - boolean startScroll = false; - if (canScrollHorizontally && Math.abs(dx) > mTouchSlop) { - if (dx > 0) { - dx -= mTouchSlop; - } else { - dx += mTouchSlop; - } - startScroll = true; + if (!mIsBeingDragged && (Math.abs(deltaX) > mTouchSlop || Math.abs(deltaY) > mTouchSlop)) { + final ViewParent parent = getParent(); + if (parent != null) { + parent.requestDisallowInterceptTouchEvent(true); } - if (canScrollVertically && Math.abs(dy) > mTouchSlop) { - if (dy > 0) { - dy -= mTouchSlop; - } else { - dy += mTouchSlop; - } - startScroll = true; + mIsBeingDragged = true; + if (deltaX > 0) { + deltaX -= mTouchSlop; + } else { + deltaX += mTouchSlop; } - if (startScroll) { - setScrollState(SCROLL_STATE_DRAGGING); + if (deltaY > 0) { + deltaY -= mTouchSlop; + } else { + deltaY += mTouchSlop; } } - - if (mScrollState == SCROLL_STATE_DRAGGING) { + if (mIsBeingDragged) { // Scroll to follow the motion event - mLastMotionY = y - mScrollOffset[1]; mLastMotionX = x - mScrollOffset[0]; + mLastMotionY = y - mScrollOffset[1]; - final int oldY = getScrollY(); final int oldX = getScrollX(); - final int rangeY = getScrollRangeY(); + final int oldY = getScrollY(); final int rangeX = getScrollRangeX(); - final int overscrollMode = ViewCompat.getOverScrollMode(this); - boolean canOverscrollY = overscrollMode == ViewCompat.OVER_SCROLL_ALWAYS || - (overscrollMode == ViewCompat.OVER_SCROLL_IF_CONTENT_SCROLLS && - rangeY > 0); - boolean canOverscrollX = overscrollMode == ViewCompat.OVER_SCROLL_ALWAYS || - (overscrollMode == ViewCompat.OVER_SCROLL_IF_CONTENT_SCROLLS && - rangeX > 0); - boolean canOverscroll = (canOverscrollY && canScrollVertically()) || (canOverscrollX && canScrollHorizontally()); - -// final ViewParent parent = getParent(); -// if (parent != null) { -// parent.requestDisallowInterceptTouchEvent(true); -// } + final int rangeY = getScrollRangeY(); + final int overscrollMode = getOverScrollMode(); + boolean canOverscroll = overscrollMode == View.OVER_SCROLL_ALWAYS + || (overscrollMode == View.OVER_SCROLL_IF_CONTENT_SCROLLS && (rangeX > 0 || rangeY > 0)); // Calling overScrollByCompat will call onOverScrolled, which // calls onScrollChanged if applicable. - if (overScrollByCompat(dx, dy, getScrollX(), getScrollY(), rangeX, rangeY, 0, 0, true)) { + if (overScrollByCompat(deltaX, deltaY, getScrollX(), getScrollY(), rangeX, rangeY, 0, + 0, true) && !hasNestedScrollingParent(ViewCompat.TYPE_TOUCH)) { // Break our velocity if we hit a scroll barrier. -// mVelocityTracker.clear(); - if (mChildHelper.hasNestedScrollingParent()) { - getParent().requestDisallowInterceptTouchEvent(true); - } + mVelocityTracker.clear(); } - final int scrolledDeltaY = getScrollY() - oldY; final int scrolledDeltaX = getScrollX() - oldX; - final int unconsumedY = dy - scrolledDeltaY; - final int unconsumedX = dx - scrolledDeltaX; - if (dispatchNestedScroll(scrolledDeltaX, scrolledDeltaY, unconsumedX, unconsumedY, mScrollOffset)) { - mLastMotionY -= mScrollOffset[1]; + final int scrolledDeltaY = getScrollY() - oldY; + final int unconsumedX = deltaX - scrolledDeltaX; + final int unconsumedY = deltaY - scrolledDeltaY; + if (dispatchNestedScroll(scrolledDeltaX, scrolledDeltaY, unconsumedX, unconsumedY, mScrollOffset, + ViewCompat.TYPE_TOUCH)) { mLastMotionX -= mScrollOffset[0]; + mLastMotionY -= mScrollOffset[1]; vtev.offsetLocation(mScrollOffset[0], mScrollOffset[1]); - mNestedYOffset += mScrollOffset[1]; mNestedXOffset += mScrollOffset[0]; + mNestedYOffset += mScrollOffset[1]; } else if (canOverscroll) { ensureGlows(); - final int pulledToY = oldY + dy; - final int pulledToX = oldX + dx; - if (canScrollVertically()) { - if (pulledToY < 0) { - mEdgeGlowTop.onPull((float) dy / getHeight(), MotionEventCompat.getX(ev, activePointerIndex) / getWidth()); - if (!mEdgeGlowBottom.isFinished()) { - mEdgeGlowBottom.onRelease(); - } - } else if (pulledToY > rangeY) { - mEdgeGlowBottom.onPull((float) dy / getHeight(), 1.f - MotionEventCompat.getX(ev, activePointerIndex) / getWidth()); - if (!mEdgeGlowTop.isFinished()) { - mEdgeGlowTop.onRelease(); - } + final int pulledToX = oldX + deltaX; + final int pulledToY = oldY + deltaY; + if (pulledToX < 0) { + EdgeEffectCompat.onPull(mEdgeGlowLeft, (float) deltaX / getWidth(), + ev.getY(activePointerIndex) / getHeight()); + if (!mEdgeGlowRight.isFinished()) { + mEdgeGlowRight.onRelease(); + } + } else if (pulledToX > rangeX) { + EdgeEffectCompat.onPull(mEdgeGlowRight, (float) deltaX / getWidth(), + 1.f - ev.getY(activePointerIndex) + / getHeight()); + if (!mEdgeGlowLeft.isFinished()) { + mEdgeGlowLeft.onRelease(); } } - if (canScrollHorizontally()) { - if (pulledToX < 0) { - mEdgeGlowLeft.onPull((float) dx / getWidth(), MotionEventCompat.getX(ev, activePointerIndex) / getHeight()); - if (!mEdgeGlowLeft.isFinished()) { - mEdgeGlowLeft.onRelease(); - } - } else if (pulledToX > rangeX) { - mEdgeGlowRight.onPull((float) dx / getWidth(), 1.f - MotionEventCompat.getX(ev, activePointerIndex) / getHeight()); - if (!mEdgeGlowRight.isFinished()) { - mEdgeGlowRight.onRelease(); - } + if (pulledToY < 0) { + EdgeEffectCompat.onPull(mEdgeGlowTop, (float) deltaY / getHeight(), + ev.getX(activePointerIndex) / getWidth()); + if (!mEdgeGlowBottom.isFinished()) { + mEdgeGlowBottom.onRelease(); + } + } else if (pulledToY > rangeY) { + EdgeEffectCompat.onPull(mEdgeGlowBottom, (float) deltaY / getHeight(), + 1.f - ev.getX(activePointerIndex) + / getWidth()); + if (!mEdgeGlowTop.isFinished()) { + mEdgeGlowTop.onRelease(); } } - if (mEdgeGlowTop != null && (!mEdgeGlowTop.isFinished() || !mEdgeGlowBottom.isFinished() || !mEdgeGlowLeft.isFinished() || !mEdgeGlowRight.isFinished())) { + if (mEdgeGlowTop != null + && (!mEdgeGlowTop.isFinished() || !mEdgeGlowBottom.isFinished() + || !mEdgeGlowLeft.isFinished() || !mEdgeGlowRight.isFinished())) { ViewCompat.postInvalidateOnAnimation(this); } } @@ -1004,38 +949,38 @@ public class HVScrollView extends ViewGroup implements NestedScrollingParent, case MotionEvent.ACTION_UP: final VelocityTracker velocityTracker = mVelocityTracker; velocityTracker.computeCurrentVelocity(1000, mMaximumVelocity); - - final float xvel = canScrollHorizontally ? - -VelocityTrackerCompat.getXVelocity(mVelocityTracker, mActivePointerId) : 0; - final float yvel = canScrollVertically ? - -VelocityTrackerCompat.getYVelocity(mVelocityTracker, mActivePointerId) : 0; - - if (fling((int) xvel, (int) yvel)) { - setScrollState(SCROLL_STATE_IDLE); - } else if (mScroller.springBack(getScrollX(), getScrollY(), 0, getScrollRangeX(), 0, getScrollRangeY())) { + int initialVelocityX = (int) velocityTracker.getXVelocity(mActivePointerId); + int initialVelocityY = (int) velocityTracker.getYVelocity(mActivePointerId); + if ((Math.abs(initialVelocityX) > mMinimumVelocity) || (Math.abs(initialVelocityY) > mMinimumVelocity)) { + flingWithNestedDispatch(-initialVelocityX, -initialVelocityY); + } else if (mScroller.springBack(getScrollX(), getScrollY(), 0, getScrollRangeX(), 0, + getScrollRangeY())) { ViewCompat.postInvalidateOnAnimation(this); } mActivePointerId = INVALID_POINTER; - resetTouch(); + endDrag(); break; case MotionEvent.ACTION_CANCEL: - if (mScrollState == SCROLL_STATE_DRAGGING) { - if (mScroller.springBack(getScrollX(), getScrollY(), 0, getScrollRangeX(), 0, getScrollRangeY())) { + if (mIsBeingDragged && getChildCount() > 0) { + if (mScroller.springBack(getScrollX(), getScrollY(), 0, getScrollRangeX(), 0, + getScrollRangeY())) { ViewCompat.postInvalidateOnAnimation(this); } } mActivePointerId = INVALID_POINTER; - cancelTouch(); + endDrag(); break; - case MotionEventCompat.ACTION_POINTER_DOWN: { - final int index = MotionEventCompat.getActionIndex(ev); - mInitialTouchX = mLastMotionY = (int) MotionEventCompat.getY(ev, index); - mInitialTouchX = mLastMotionX = (int) MotionEventCompat.getX(ev, index); - mActivePointerId = MotionEventCompat.getPointerId(ev, index); + case MotionEvent.ACTION_POINTER_DOWN: { + final int index = ev.getActionIndex(); + mLastMotionX = (int) ev.getX(index); + mLastMotionY = (int) ev.getY(index); + mActivePointerId = ev.getPointerId(index); break; } - case MotionEventCompat.ACTION_POINTER_UP: + case MotionEvent.ACTION_POINTER_UP: onSecondaryPointerUp(ev); + mLastMotionX = (int) ev.getX(ev.findPointerIndex(mActivePointerId)); + mLastMotionY = (int) ev.getY(ev.findPointerIndex(mActivePointerId)); break; } @@ -1046,57 +991,56 @@ public class HVScrollView extends ViewGroup implements NestedScrollingParent, return true; } + private int getAxes() { + int axes = ViewCompat.SCROLL_AXIS_NONE; + if ((scrollModeFlag & DISABLE_VERTICAL_SCROLL) != DISABLE_VERTICAL_SCROLL) { + axes |= ViewCompat.SCROLL_AXIS_VERTICAL; + } + if ((scrollModeFlag & DISABLE_HORIZONTAL_SCROLL) != DISABLE_HORIZONTAL_SCROLL) { + axes |= ViewCompat.SCROLL_AXIS_HORIZONTAL; + } + return axes; + } + private void onSecondaryPointerUp(MotionEvent ev) { - final int pointerIndex = (ev.getAction() & MotionEventCompat.ACTION_POINTER_INDEX_MASK) >> - MotionEventCompat.ACTION_POINTER_INDEX_SHIFT; - final int pointerId = MotionEventCompat.getPointerId(ev, pointerIndex); + final int pointerIndex = ev.getActionIndex(); + final int pointerId = ev.getPointerId(pointerIndex); if (pointerId == mActivePointerId) { // This was our active pointer going up. Choose a new // active pointer and adjust accordingly. // TODO: Make this decision more intelligent. final int newPointerIndex = pointerIndex == 0 ? 1 : 0; - mInitialTouchX = mLastMotionY = (int) MotionEventCompat.getY(ev, newPointerIndex); - mInitialTouchY = mLastMotionX = (int) MotionEventCompat.getX(ev, newPointerIndex); - mActivePointerId = MotionEventCompat.getPointerId(ev, newPointerIndex); + mLastMotionY = (int) ev.getY(newPointerIndex); + mLastMotionX = (int) ev.getX(newPointerIndex); + mActivePointerId = ev.getPointerId(newPointerIndex); if (mVelocityTracker != null) { mVelocityTracker.clear(); } } } + @Override public boolean onGenericMotionEvent(MotionEvent event) { - if ((MotionEventCompat.getSource(event) & InputDeviceCompat.SOURCE_CLASS_POINTER) != 0) { + if ((event.getSource() & InputDeviceCompat.SOURCE_CLASS_POINTER) != 0) { switch (event.getAction()) { - case MotionEventCompat.ACTION_SCROLL: { - final float vscroll = MotionEventCompat.getAxisValue(event, MotionEventCompat.AXIS_VSCROLL); - final float hscroll = MotionEventCompat.getAxisValue(event, MotionEventCompat.AXIS_HSCROLL); - if (vscroll != 0) { - int newScrollY = getScrollY(), oldScrollY = newScrollY; - int newScrollX = getScrollX(), oldScrollX = newScrollX; - if (canScrollHorizontally()) { - final int rangeX = getScrollRangeX(); + case MotionEvent.ACTION_SCROLL: { + if (!mIsBeingDragged) { + final float hscroll = event.getAxisValue(MotionEvent.AXIS_HSCROLL); + final float vscroll = event.getAxisValue(MotionEvent.AXIS_VSCROLL); + if (vscroll != 0 || hscroll != 0) { final int deltaX = (int) (hscroll * getHorizontalScrollFactorCompat()); - newScrollX = oldScrollX - deltaX; - if (newScrollX < 0) { - newScrollX = 0; - } else if (newScrollX > rangeX) { - newScrollX = rangeX; - } - } - if (canScrollVertically()) { final int deltaY = (int) (vscroll * getVerticalScrollFactorCompat()); + final int rangeX = getScrollRangeX(); final int rangeY = getScrollRangeY(); - newScrollY = oldScrollY - deltaY; - if (newScrollY < 0) { - newScrollY = 0; - } else if (newScrollY > rangeY) { - newScrollY = rangeY; + int oldScrollX = getScrollX(); + int oldScrollY = getScrollY(); + int newScrollX = Math.max(0, Math.min(rangeX, oldScrollX - deltaX)); + int newScrollY = Math.max(0, Math.min(rangeY, oldScrollY - deltaY)); + if (newScrollY != oldScrollY || newScrollX != oldScrollX) { + super.scrollTo(newScrollX, newScrollY); + return true; } } - if (newScrollY != oldScrollY || newScrollX != oldScrollX) { - super.scrollTo(newScrollX, newScrollY); - return true; - } } } } @@ -1104,6 +1048,21 @@ public class HVScrollView extends ViewGroup implements NestedScrollingParent, return false; } + private float getHorizontalScrollFactorCompat() { + if (mHorizontalScrollFactor == 0) { + TypedValue outValue = new TypedValue(); + final Context context = getContext(); + if (!context.getTheme().resolveAttribute( + android.R.attr.listPreferredItemHeight, outValue, true)) { + throw new IllegalStateException( + "Expected theme to define listPreferredItemHeight."); + } + mHorizontalScrollFactor = outValue.getDimension( + context.getResources().getDisplayMetrics()); + } + return mHorizontalScrollFactor; + } + private float getVerticalScrollFactorCompat() { if (mVerticalScrollFactor == 0) { TypedValue outValue = new TypedValue(); @@ -1119,21 +1078,7 @@ public class HVScrollView extends ViewGroup implements NestedScrollingParent, return mVerticalScrollFactor; } - private float getHorizontalScrollFactorCompat() { - if (mVerticalScrollFactor == 0) { - TypedValue outValue = new TypedValue(); - final Context context = getContext(); - if (!context.getTheme().resolveAttribute( - android.R.attr.listPreferredItemHeight, outValue, true)) { - throw new IllegalStateException( - "Expected theme to define listPreferredItemHeight."); - } - mVerticalScrollFactor = outValue.getDimension( - context.getResources().getDisplayMetrics()); - } - return mVerticalScrollFactor; - } - + @Override protected void onOverScrolled(int scrollX, int scrollY, boolean clampedX, boolean clampedY) { super.scrollTo(scrollX, scrollY); @@ -1144,27 +1089,24 @@ public class HVScrollView extends ViewGroup implements NestedScrollingParent, int scrollRangeX, int scrollRangeY, int maxOverScrollX, int maxOverScrollY, boolean isTouchEvent) { - int oldScrollX = getScrollX(); - int oldScrollY = getScrollY(); - - final int overScrollMode = ViewCompat.getOverScrollMode(this); + final int overScrollMode = getOverScrollMode(); final boolean canScrollHorizontal = - computeHorizontalScrollRange() > computeHorizontalScrollExtent() && canScrollHorizontally(); + computeHorizontalScrollRange() > computeHorizontalScrollExtent(); final boolean canScrollVertical = - computeVerticalScrollRange() > computeVerticalScrollExtent() && canScrollVertically(); - final boolean overScrollHorizontal = overScrollMode == ViewCompat.OVER_SCROLL_ALWAYS || - (overScrollMode == ViewCompat.OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollHorizontal); - final boolean overScrollVertical = overScrollMode == ViewCompat.OVER_SCROLL_ALWAYS || - (overScrollMode == ViewCompat.OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollVertical); + computeVerticalScrollRange() > computeVerticalScrollExtent(); + final boolean overScrollHorizontal = overScrollMode == View.OVER_SCROLL_ALWAYS + || (overScrollMode == View.OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollHorizontal); + final boolean overScrollVertical = overScrollMode == View.OVER_SCROLL_ALWAYS + || (overScrollMode == View.OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollVertical); - int newScrollX = scrollX; - if (canScrollHorizontally()) { - newScrollX += deltaX; + int newScrollX = scrollX + deltaX; + if (!overScrollHorizontal) { + maxOverScrollX = 0; } - int newScrollY = scrollY; - if (canScrollVertically()) { - newScrollY += deltaY; + int newScrollY = scrollY + deltaY; + if (!overScrollVertical) { + maxOverScrollY = 0; } // Clamp values if at the limits and record @@ -1191,35 +1133,39 @@ public class HVScrollView extends ViewGroup implements NestedScrollingParent, clampedY = true; } - if (clampedY && clampedX) { + if ((clampedX || clampedY) && !hasNestedScrollingParent(ViewCompat.TYPE_NON_TOUCH)) { mScroller.springBack(newScrollX, newScrollY, 0, getScrollRangeX(), 0, getScrollRangeY()); } onOverScrolled(newScrollX, newScrollY, clampedX, clampedY); - return getScrollX() - oldScrollX == deltaX || getScrollY() - oldScrollY == deltaY; + return clampedX || clampedY; } - private int getScrollRangeY() { + int getScrollRangeX() { int scrollRange = 0; if (getChildCount() > 0) { View child = getChildAt(0); - scrollRange = Math.max(0, child.getHeight() - (getHeight() - getPaddingBottom() - getPaddingTop())); + scrollRange = Math.max(0, + child.getWidth() - (getWidth() - getPaddingLeft() - getPaddingRight())); } return scrollRange; } - private int getScrollRangeX() { + int getScrollRangeY() { int scrollRange = 0; if (getChildCount() > 0) { View child = getChildAt(0); - scrollRange = Math.max(0, child.getWidth() - (getWidth() - getPaddingLeft() - getPaddingRight())); + scrollRange = Math.max(0, + child.getHeight() - (getHeight() - getPaddingBottom() - getPaddingTop())); } return scrollRange; } /** + *

* Finds the next focusable component that fits in the specified bounds. + *

* * @param topFocus look for a candidate is the one at the top of the bounds * if topFocus is true, or at the bottom of the bounds if topFocus is @@ -1231,7 +1177,7 @@ public class HVScrollView extends ViewGroup implements NestedScrollingParent, * @return the next focusable component in the bounds or null if none can * be found */ - private View findFocusableViewInBoundsVertically(boolean topFocus, int top, int bottom) { + private View findFocusableViewInBounds(boolean topFocus, int top, int bottom) { List focusables = getFocusables(View.FOCUS_FORWARD); View focusCandidate = null; @@ -1257,8 +1203,7 @@ public class HVScrollView extends ViewGroup implements NestedScrollingParent, * focusing */ - final boolean viewIsFullyContained = (top < viewTop) && - (viewBottom < bottom); + final boolean viewIsFullyContained = (top < viewTop) && (viewBottom < bottom); if (focusCandidate == null) { /* No candidate, take this one */ @@ -1266,76 +1211,8 @@ public class HVScrollView extends ViewGroup implements NestedScrollingParent, foundFullyContainedFocusable = viewIsFullyContained; } else { final boolean viewIsCloserToBoundary = - (topFocus && viewTop < focusCandidate.getTop()) || - (!topFocus && viewBottom > focusCandidate - .getBottom()); - - if (foundFullyContainedFocusable) { - if (viewIsFullyContained && viewIsCloserToBoundary) { - /* - * We're dealing with only fully contained views, so - * it has to be closer to the boundary to beat our - * candidate - */ - focusCandidate = view; - } - } else { - if (viewIsFullyContained) { - /* Any fully contained view beats a partially contained view */ - focusCandidate = view; - foundFullyContainedFocusable = true; - } else if (viewIsCloserToBoundary) { - /* - * Partially contained view beats another partially - * contained view if it's closer - */ - focusCandidate = view; - } - } - } - } - } - - return focusCandidate; - } - - private View findFocusableViewInBoundsHorizontally(boolean topFocus, int left, int right) { - List focusables = getFocusables(View.FOCUS_FORWARD); - View focusCandidate = null; - - /* - * A fully contained focusable is one where its top is below the bound's - * top, and its bottom is above the bound's bottom. A partially - * contained focusable is one where some part of it is within the - * bounds, but it also has some part that is not within bounds. A fully contained - * focusable is preferred to a partially contained focusable. - */ - boolean foundFullyContainedFocusable = false; - - int count = focusables.size(); - for (int i = 0; i < count; i++) { - View view = focusables.get(i); - int viewLeft = view.getLeft(); - int viewRight = view.getRight(); - - if (left < viewRight && viewLeft < viewRight) { - /* - * the focusable is in the target area, it is a candidate for - * focusing - */ - - final boolean viewIsFullyContained = (left < viewLeft) && - (viewRight < right); - - if (focusCandidate == null) { - /* No candidate, take this one */ - focusCandidate = view; - foundFullyContainedFocusable = viewIsFullyContained; - } else { - final boolean viewIsCloserToBoundary = - (topFocus && viewLeft < focusCandidate.getTop()) || - (!topFocus && viewRight > focusCandidate - .getBottom()); + (topFocus && viewTop < focusCandidate.getTop()) + || (!topFocus && viewBottom > focusCandidate.getBottom()); if (foundFullyContainedFocusable) { if (viewIsFullyContained && viewIsCloserToBoundary) { @@ -1367,41 +1244,18 @@ public class HVScrollView extends ViewGroup implements NestedScrollingParent, } /** - * Handles scrolling in response to a "page up/down" shortcut press. This + *

Handles scrolling in response to a "page up/down" shortcut press. This * method will scroll the view by one page up or down and give the focus * to the topmost/bottommost component in the new visible area. If no * component is a good candidate for focus, this scrollview reclaims the - * focus. + * focus.

* - * @param direction the scroll direction: {@link View#FOCUS_UP} + * @param direction the scroll direction: {@link android.view.View#FOCUS_UP} * to go one page up or - * {@link View#FOCUS_DOWN} to go one page down + * {@link android.view.View#FOCUS_DOWN} to go one page down * @return true if the key event is consumed by this method, false otherwise */ - public boolean pageScrollHorizontally(int direction) { - boolean down = direction == View.FOCUS_DOWN; - int width = getWidth(); - - if (down) { - mTempRect.left = getScrollX() + width; - int count = getChildCount(); - if (count > 0) { - View view = getChildAt(count - 1); - if (mTempRect.left + width > view.getRight()) { - mTempRect.left = view.getRight() - width; - } - } - } else { - mTempRect.left = getScrollY() - width; - if (mTempRect.left < 0) { - mTempRect.left = 0; - } - } - mTempRect.right = mTempRect.left + width; - return scrollAndFocusHorizontally(direction, mTempRect.left, mTempRect.right); - } - - public boolean pageScrollVertically(int direction) { + public boolean pageScroll(int direction) { boolean down = direction == View.FOCUS_DOWN; int height = getHeight(); @@ -1421,22 +1275,23 @@ public class HVScrollView extends ViewGroup implements NestedScrollingParent, } } mTempRect.bottom = mTempRect.top + height; - return scrollAndFocusVertically(direction, mTempRect.top, mTempRect.bottom); + + return scrollAndFocus(direction, mTempRect.top, mTempRect.bottom); } /** - * Handles scrolling in response to a "home/end" shortcut press. This + *

Handles scrolling in response to a "home/end" shortcut press. This * method will scroll the view to the top or bottom and give the focus * to the topmost/bottommost component in the new visible area. If no * component is a good candidate for focus, this scrollview reclaims the - * focus. + * focus.

* - * @param direction the scroll direction: {@link View#FOCUS_UP} + * @param direction the scroll direction: {@link android.view.View#FOCUS_UP} * to go the top of the view or - * {@link View#FOCUS_DOWN} to go the bottom + * {@link android.view.View#FOCUS_DOWN} to go the bottom * @return true if the key event is consumed by this method, false otherwise */ - public boolean fullScrollVertically(int direction) { + public boolean fullScroll(int direction) { boolean down = direction == View.FOCUS_DOWN; int height = getHeight(); @@ -1452,79 +1307,22 @@ public class HVScrollView extends ViewGroup implements NestedScrollingParent, } } - return scrollAndFocusVertically(direction, mTempRect.top, mTempRect.bottom); + return scrollAndFocus(direction, mTempRect.top, mTempRect.bottom); } /** - * Handles scrolling in response to a "home/end" shortcut press. This - * method will scroll the view to the top or bottom and give the focus - * to the topmost/bottommost component in the new visible area. If no - * component is a good candidate for focus, this scrollview reclaims the - * focus. - * - * @param direction the scroll direction: {@link View#FOCUS_UP} - * to go the top of the view or - * {@link View#FOCUS_DOWN} to go the bottom - * @return true if the key event is consumed by this method, false otherwise - */ - public boolean fullScrollHorizontally(int direction) { - boolean down = direction == View.FOCUS_RIGHT; - int width = getWidth(); - - mTempRect.left = 0; - mTempRect.right = width; - - if (down) { - int count = getChildCount(); - if (count > 0) { - View view = getChildAt(count - 1); - mTempRect.right = view.getRight() + getPaddingLeft(); - mTempRect.left = mTempRect.right - width; - } - } - - return scrollAndFocusHorizontally(direction, mTempRect.left, mTempRect.right); - } - - - private boolean scrollAndFocusHorizontally(int direction, int left, int right) { - boolean handled = true; - - int width = getWidth(); - int containerLeft = getScrollX(); - int containerRight = containerLeft + width; - boolean up = direction == View.FOCUS_LEFT; - - View newFocused = findFocusableViewInBoundsHorizontally(up, left, right); - if (newFocused == null) { - newFocused = this; - } - - if (left >= containerLeft && right <= containerRight) { - handled = false; - } else { - int delta = up ? (left - containerLeft) : (right - containerRight); - doScrollX(delta); - } - - if (newFocused != findFocus()) newFocused.requestFocus(direction); - - return handled; - } - - /** - * Scrolls the view to make the area defined by top and + *

Scrolls the view to make the area defined by top and * bottom visible. This method attempts to give the focus * to a component visible in this area. If no component can be focused in - * the new visible area, the focus is reclaimed by this ScrollView. + * the new visible area, the focus is reclaimed by this ScrollView.

* - * @param direction the scroll direction: {@link View#FOCUS_UP} - * to go upward, {@link View#FOCUS_DOWN} to downward + * @param direction the scroll direction: {@link android.view.View#FOCUS_UP} + * to go upward, {@link android.view.View#FOCUS_DOWN} to downward * @param top the top offset of the new area to be made visible * @param bottom the bottom offset of the new area to be made visible * @return true if the key event is consumed by this method, false otherwise */ - private boolean scrollAndFocusVertically(int direction, int top, int bottom) { + private boolean scrollAndFocus(int direction, int top, int bottom) { boolean handled = true; int height = getHeight(); @@ -1532,7 +1330,7 @@ public class HVScrollView extends ViewGroup implements NestedScrollingParent, int containerBottom = containerTop + height; boolean up = direction == View.FOCUS_UP; - View newFocused = findFocusableViewInBoundsVertically(up, top, bottom); + View newFocused = findFocusableViewInBounds(up, top, bottom); if (newFocused == null) { newFocused = this; } @@ -1541,7 +1339,7 @@ public class HVScrollView extends ViewGroup implements NestedScrollingParent, handled = false; } else { int delta = up ? (top - containerTop) : (bottom - containerBottom); - doScrollY(delta); + doScroll(new int[]{0, delta}); } if (newFocused != findFocus()) newFocused.requestFocus(direction); @@ -1556,77 +1354,20 @@ public class HVScrollView extends ViewGroup implements NestedScrollingParent, * pressed * @return True if we consumed the event, false otherwise */ - public boolean arrowScrollHorizontally(int direction) { + public boolean arrowScroll(int direction) { View currentFocused = findFocus(); if (currentFocused == this) currentFocused = null; View nextFocused = FocusFinder.getInstance().findNextFocus(this, currentFocused, direction); - final int maxJump = getMaxScrollAmountX(); + final int maxJump = getMaxScrollAmount(); - if (nextFocused != null && isWithinDeltaOfScreenX(nextFocused, maxJump, getWidth())) { + if (nextFocused != null && isWithinDeltaOfScreen(nextFocused, maxJump, getHeight())) { nextFocused.getDrawingRect(mTempRect); offsetDescendantRectToMyCoords(nextFocused, mTempRect); int[] scrollDelta = computeScrollDeltaToGetChildRectOnScreen(mTempRect); - doScrollX(scrollDelta[0]); - nextFocused.requestFocus(direction); - } else { - // no new focus - int scrollDelta = maxJump; - - if (direction == View.FOCUS_UP && getScrollX() < scrollDelta) { - scrollDelta = getScrollX(); - } else if (direction == View.FOCUS_DOWN) { - if (getChildCount() > 0) { - int daRight = getChildAt(0).getRight(); - int screenRight = getScrollX() + getWidth() - getPaddingRight(); - if (daRight - screenRight < maxJump) { - scrollDelta = daRight - screenRight; - } - } - } - if (scrollDelta == 0) { - return false; - } - doScrollX(direction == View.FOCUS_DOWN ? scrollDelta : -scrollDelta); - } - - if (currentFocused != null && currentFocused.isFocused() && isOffScreenX(currentFocused)) { - // previously focused item still has focus and is off screen, give - // it up (take it back to ourselves) - // (also, need to temporarily force FOCUS_BEFORE_DESCENDANTS so we are - // sure to - // get it) - final int descendantFocusability = getDescendantFocusability(); // save - setDescendantFocusability(ViewGroup.FOCUS_BEFORE_DESCENDANTS); - requestFocus(); - setDescendantFocusability(descendantFocusability); // restore - } - return true; - } - - /** - * Handle scrolling in response to an up or down arrow click. - * - * @param direction The direction corresponding to the arrow key that was - * pressed - * @return True if we consumed the event, false otherwise - */ - public boolean arrowScrollVertically(int direction) { - - View currentFocused = findFocus(); - if (currentFocused == this) currentFocused = null; - - View nextFocused = FocusFinder.getInstance().findNextFocus(this, currentFocused, direction); - - final int maxJump = getMaxScrollAmountY(); - - if (nextFocused != null && isWithinDeltaOfScreenY(nextFocused, maxJump, getHeight())) { - nextFocused.getDrawingRect(mTempRect); - offsetDescendantRectToMyCoords(nextFocused, mTempRect); - int[] scrollDelta = computeScrollDeltaToGetChildRectOnScreen(mTempRect); - doScrollY(scrollDelta[1]); + doScroll(scrollDelta); nextFocused.requestFocus(direction); } else { // no new focus @@ -1646,11 +1387,11 @@ public class HVScrollView extends ViewGroup implements NestedScrollingParent, if (scrollDelta == 0) { return false; } - doScrollY(direction == View.FOCUS_DOWN ? scrollDelta : -scrollDelta); + doScroll(new int[]{0, direction == View.FOCUS_DOWN ? scrollDelta : -scrollDelta}); } if (currentFocused != null && currentFocused.isFocused() - && isOffScreenY(currentFocused)) { + && isOffScreen(currentFocused)) { // previously focused item still has focus and is off screen, give // it up (take it back to ourselves) // (also, need to temporarily force FOCUS_BEFORE_DESCENDANTS so we are @@ -1668,36 +1409,15 @@ public class HVScrollView extends ViewGroup implements NestedScrollingParent, * @return whether the descendant of this scroll view is scrolled off * screen. */ - private boolean isOffScreenX(View descendant) { - return !isWithinDeltaOfScreenX(descendant, 0, getWidth()); - } - - - /** - * @return whether the descendant of this scroll view is scrolled off - * screen. - */ - private boolean isOffScreenY(View descendant) { - return !isWithinDeltaOfScreenY(descendant, 0, getHeight()); + private boolean isOffScreen(View descendant) { + return !isWithinDeltaOfScreen(descendant, 0, getHeight()); } /** * @return whether the descendant of this scroll view is within delta * pixels of being on the screen. */ - private boolean isWithinDeltaOfScreenX(View descendant, int delta, int width) { - descendant.getDrawingRect(mTempRect); - offsetDescendantRectToMyCoords(descendant, mTempRect); - - return (mTempRect.right + delta) >= getScrollX() - && (mTempRect.left - delta) <= (getScrollX() + width); - } - - /** - * @return whether the descendant of this scroll view is within delta - * pixels of being on the screen. - */ - private boolean isWithinDeltaOfScreenY(View descendant, int delta, int height) { + private boolean isWithinDeltaOfScreen(View descendant, int delta, int height) { descendant.getDrawingRect(mTempRect); offsetDescendantRectToMyCoords(descendant, mTempRect); @@ -1705,41 +1425,17 @@ public class HVScrollView extends ViewGroup implements NestedScrollingParent, && (mTempRect.top - delta) <= (getScrollY() + height); } - private void doScrollXY(int[] delta) { - doScrollXY(delta[0], delta[1]); - } - - private void doScrollXY(int deltaX, int deltaY) { - if (deltaX != 0 || deltaY != 0) { - if (mSmoothScrollingEnabled) { - smoothScrollBy(deltaX, deltaY); - } else { - scrollBy(deltaX, deltaY); - } - } - } - /** - * Smooth scroll by a Y delta + * Smooth scroll * - * @param delta the number of pixels to scroll by on the Y axis + * @param delta the number of pixels to scroll by on the X or Y axis */ - private void doScrollY(int delta) { - if (delta != 0) { + private void doScroll(int[] delta) { + if (delta[0] != 0 || delta[1] != 0) { if (mSmoothScrollingEnabled) { - smoothScrollBy(0, delta); + smoothScrollBy(delta[0], delta[1]); } else { - scrollBy(0, delta); - } - } - } - - private void doScrollX(int delta) { - if (delta != 0) { - if (mSmoothScrollingEnabled) { - smoothScrollBy(delta, 0); - } else { - scrollBy(delta, 0); + scrollBy(delta[0], delta[1]); } } } @@ -1757,23 +1453,19 @@ public class HVScrollView extends ViewGroup implements NestedScrollingParent, } long duration = AnimationUtils.currentAnimationTimeMillis() - mLastScroll; if (duration > ANIMATED_SCROLL_GAP) { - setScrollState(SCROLL_STATE_SETTLING); - + final int width = getWidth() - getPaddingLeft() - getPaddingRight(); final int height = getHeight() - getPaddingBottom() - getPaddingTop(); - final int bottom = getChildAt(0).getHeight(); - final int width = getWidth() - getPaddingRight() - getPaddingLeft(); final int right = getChildAt(0).getWidth(); - final int maxY = Math.max(0, bottom - height); + final int bottom = getChildAt(0).getHeight(); final int maxX = Math.max(0, right - width); - final int scrollY = getScrollY(); + final int maxY = Math.max(0, bottom - height); final int scrollX = getScrollX(); - dy = Math.max(0, Math.min(scrollY + dy, maxY)) - scrollY; + final int scrollY = getScrollY(); dx = Math.max(0, Math.min(scrollX + dx, maxX)) - scrollX; - + dy = Math.max(0, Math.min(scrollY + dy, maxY)) - scrollY; mScroller.startScroll(scrollX, scrollY, dx, dy); ViewCompat.postInvalidateOnAnimation(this); } else { - setScrollState(SCROLL_STATE_IDLE); if (!mScroller.isFinished()) { mScroller.abortAnimation(); } @@ -1792,16 +1484,15 @@ public class HVScrollView extends ViewGroup implements NestedScrollingParent, smoothScrollBy(x - getScrollX(), y - getScrollY()); } - /** - * The scroll range of a scroll view is the overall height of all of its - * children. + *

The scroll range of a scroll view is the overall height of all of its + * children.

+ * + * @hide */ + @RestrictTo(RestrictTo.Scope.LIBRARY_GROUP) @Override public int computeVerticalScrollRange() { - if (!canScrollVertically()) { - return super.computeVerticalScrollRange(); - } final int count = getChildCount(); final int contentHeight = getHeight() - getPaddingBottom() - getPaddingTop(); if (count == 0) { @@ -1821,31 +1512,31 @@ public class HVScrollView extends ViewGroup implements NestedScrollingParent, } /** - * + * @hide */ + @RestrictTo(RestrictTo.Scope.LIBRARY_GROUP) @Override public int computeVerticalScrollOffset() { return Math.max(0, super.computeVerticalScrollOffset()); } /** - * + * @hide */ + @RestrictTo(RestrictTo.Scope.LIBRARY_GROUP) @Override public int computeVerticalScrollExtent() { return super.computeVerticalScrollExtent(); } /** - * + * @hide */ + @RestrictTo(RestrictTo.Scope.LIBRARY_GROUP) @Override public int computeHorizontalScrollRange() { - if (!canScrollHorizontally()) { - return super.computeHorizontalScrollRange(); - } final int count = getChildCount(); - final int contentWidth = getWidth() - getPaddingRight() - getPaddingLeft(); + final int contentWidth = getWidth() - getPaddingLeft() - getPaddingRight(); if (count == 0) { return contentWidth; } @@ -1858,235 +1549,117 @@ public class HVScrollView extends ViewGroup implements NestedScrollingParent, } else if (scrollX > overscrollRight) { scrollRange += scrollX - overscrollRight; } + return scrollRange; } /** - * + * @hide */ + @RestrictTo(RestrictTo.Scope.LIBRARY_GROUP) @Override public int computeHorizontalScrollOffset() { - return Math.max(0, super.computeHorizontalScrollOffset()); + return super.computeHorizontalScrollOffset(); } /** - * + * @hide */ + @RestrictTo(RestrictTo.Scope.LIBRARY_GROUP) @Override public int computeHorizontalScrollExtent() { return super.computeHorizontalScrollExtent(); } @Override - protected void onLayout(boolean changed, int l, int t, int r, int b) { - if (getChildCount() == 0) { - return; - } - View child = getChildAt(0); - final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams(); + protected void measureChild(View child, int parentWidthMeasureSpec, + int parentHeightMeasureSpec) { + ViewGroup.LayoutParams lp = child.getLayoutParams(); - int childLeft = getPaddingLeft() + lp.leftMargin; - int childTop = getPaddingTop() + lp.topMargin; - if (mChildLayoutCenter) { - if (getMeasuredWidth() > child.getMeasuredWidth()) { - childLeft = (getMeasuredWidth() - child.getMeasuredWidth()) / 2; - } - if (getMeasuredHeight() > child.getMeasuredHeight()) { - childTop = (getMeasuredHeight() - child.getMeasuredHeight()) / 2; - } - } - int measureHeight = child.getMeasuredHeight(); - int measuredWidth = child.getMeasuredWidth(); - child.layout(childLeft, childTop, measuredWidth + childLeft, childTop + measureHeight); - - - mIsLayoutDirty = false; - // Give a child focus if it needs it - if (mChildToScrollTo != null && isViewDescendantOf(mChildToScrollTo, this)) { - scrollToChild(mChildToScrollTo); - } - mChildToScrollTo = null; - - if (!mIsLaidOut) { - if (mSavedState != null) { - scrollTo(mSavedState.scrollXPosition, mSavedState.scrollYPosition); - mSavedState = null; - } // mScrollY default value is "0" - - final int childHeight = (getChildCount() > 0) ? getChildAt(0).getMeasuredHeight() : 0; - final int scrollRangeY = Math.max(0, - childHeight - (b - t - getPaddingBottom() - getPaddingTop())); - - final int childWidth = (getChildCount() > 0) ? getChildAt(0).getMeasuredWidth() : 0; - final int scrollRangeX = Math.max(0, - childWidth - (b - t - getPaddingRight() - getPaddingLeft())); - - int sY = getScrollY(); - int sX = getScrollX(); - - // Don't forget to clamp - if (getScrollY() > scrollRangeY) { - sY = scrollRangeY; - } else if (getScrollY() < 0) { - sY = 0; - } - if (getScrollX() > scrollRangeX) { - sX = scrollRangeX; - } else if (getScrollX() < 0) { - sX = 0; - } - if (sX != getScrollX() || sY != getScrollY()) { - scrollTo(sX, sY); - } - } - - // Calling this with the present values causes it to re-claim them - scrollTo(getScrollX(), getScrollY()); - mIsLaidOut = true; - } - - @Override - public MarginLayoutParams generateLayoutParams(AttributeSet attrs) { - return new MarginLayoutParams(getContext(), attrs); - } - - /** - * {@inheritDoc} - */ - @Override - protected boolean checkLayoutParams(LayoutParams p) { - return p instanceof MarginLayoutParams; - } - - @Override - protected MarginLayoutParams generateLayoutParams(LayoutParams p) { - return new MarginLayoutParams(p); - } - - @Override - protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { - if (getChildCount() == 0) { - return; - } - View child = getChildAt(0); - MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams(); - - int widthPadding = lp.leftMargin + lp.rightMargin + getPaddingLeft() + getPaddingRight(); - int heightPadding = lp.topMargin + lp.bottomMargin + getPaddingTop() + getPaddingBottom(); - int maxWidth = widthPadding; - int maxHeight = heightPadding; - maxHeight = Math.max(maxHeight, getSuggestedMinimumHeight()); - maxWidth = Math.max(maxWidth, getSuggestedMinimumWidth()); - - int childState = 0; int childWidthMeasureSpec; int childHeightMeasureSpec; - if (canScrollVertically()) { - childHeightMeasureSpec = MeasureSpec.makeMeasureSpec( - MeasureSpec.getSize(heightMeasureSpec), MeasureSpec.UNSPECIFIED); - } else { - childHeightMeasureSpec = getChildMeasureSpec(heightMeasureSpec, - getPaddingBottom() + getPaddingTop() + lp.topMargin + lp.bottomMargin, lp.height); - } - if (canScrollHorizontally()) { - childWidthMeasureSpec = MeasureSpec.makeMeasureSpec( - MeasureSpec.getSize(widthMeasureSpec), MeasureSpec.UNSPECIFIED); - } else { - childWidthMeasureSpec = getChildMeasureSpec(widthMeasureSpec, - getPaddingLeft() + getPaddingRight() + lp.leftMargin + lp.rightMargin, lp.width); - } + childWidthMeasureSpec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED); + + childHeightMeasureSpec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED); + child.measure(childWidthMeasureSpec, childHeightMeasureSpec); + } - if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) { - childState = combineMeasuredStates(childState, child.getMeasuredState()); - } - maxWidth = Math.max(maxWidth, child.getMeasuredWidth() + lp.leftMargin + lp.rightMargin); - maxHeight = Math.max(maxHeight, child.getMeasuredHeight() + lp.topMargin + lp.bottomMargin); + @Override + protected void measureChildWithMargins(View child, int parentWidthMeasureSpec, int widthUsed, + int parentHeightMeasureSpec, int heightUsed) { + final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams(); - maxHeight = Math.max(maxHeight, getSuggestedMinimumHeight()); - maxWidth = Math.max(maxWidth, getSuggestedMinimumWidth()); + final int childWidthMeasureSpec = MeasureSpec.makeMeasureSpec( + lp.leftMargin + lp.rightMargin, MeasureSpec.UNSPECIFIED); + final int childHeightMeasureSpec = MeasureSpec.makeMeasureSpec( + lp.topMargin + lp.bottomMargin, MeasureSpec.UNSPECIFIED); - int measuredWidth = ViewCompat.resolveSizeAndState(maxWidth, widthMeasureSpec, childState); - int measuredHeight = ViewCompat.resolveSizeAndState(maxHeight, heightMeasureSpec, childState << MEASURED_HEIGHT_STATE_SHIFT); - setMeasuredDimension(measuredWidth, measuredHeight); - - - boolean needMeasure = false; - final int heightMode = MeasureSpec.getMode(heightMeasureSpec); - if (heightMode != MeasureSpec.UNSPECIFIED && mFillViewportV) { - if (child.getMeasuredHeight() < measuredHeight - heightPadding) { - int newChildHeightMeasureSpec = MeasureSpec.makeMeasureSpec(measuredHeight - heightPadding, MeasureSpec.EXACTLY); - if (newChildHeightMeasureSpec != childHeightMeasureSpec) { - childHeightMeasureSpec = newChildHeightMeasureSpec; - needMeasure = true; - } - } - } - final int widthMode = MeasureSpec.getMode(widthMeasureSpec); - if (widthMode != MeasureSpec.UNSPECIFIED && mFillViewportH) { - if (child.getMeasuredWidth() < measuredWidth - widthPadding) { - int newChildWidthMeasureSpec = MeasureSpec.makeMeasureSpec(measuredWidth - widthPadding, MeasureSpec.EXACTLY); - if (newChildWidthMeasureSpec != childWidthMeasureSpec) { - childWidthMeasureSpec = newChildWidthMeasureSpec; - needMeasure = true; - } - } - } - if (needMeasure) { - child.measure(childWidthMeasureSpec, childHeightMeasureSpec); - } + child.measure(childWidthMeasureSpec, childHeightMeasureSpec); } @Override public void computeScroll() { if (mScroller.computeScrollOffset()) { - int oldX = getScrollX(); - int oldY = getScrollY(); - int x = mScroller.getCurrX(); - int y = mScroller.getCurrY(); + final int x = mScroller.getCurrX(); + final int y = mScroller.getCurrY(); - if (oldX != x || oldY != y) { - final int rangeY = getScrollRangeY(); + int dx = x - mLastScrollerX; + int dy = y - mLastScrollerY; + + // Dispatch up to parent + if (dispatchNestedPreScroll(dx, dy, mScrollConsumed, null, ViewCompat.TYPE_NON_TOUCH)) { + dx -= mScrollConsumed[0]; + dy -= mScrollConsumed[1]; + } + + if (dy != 0 || dx != 0) { final int rangeX = getScrollRangeX(); - final int overscrollMode = ViewCompat.getOverScrollMode(this); - final boolean canOverscrollY = overscrollMode == ViewCompat.OVER_SCROLL_ALWAYS || - (overscrollMode == ViewCompat.OVER_SCROLL_IF_CONTENT_SCROLLS && rangeY > 0); - final boolean canOverscrollX = overscrollMode == ViewCompat.OVER_SCROLL_ALWAYS || - (overscrollMode == ViewCompat.OVER_SCROLL_IF_CONTENT_SCROLLS && rangeX > 0); - boolean canOverscroll = canOverscrollY || canOverscrollX; + final int rangeY = getScrollRangeY(); + final int oldScrollX = getScrollX(); + final int oldScrollY = getScrollY(); - overScrollByCompat(x - oldX, y - oldY, oldX, oldY, rangeX, rangeY, - 0, 0, false); + overScrollByCompat(dx, dy, oldScrollX, oldScrollY, rangeX, rangeY, 0, 0, false); - if (canOverscroll) { - ensureGlows(); - if (y <= 0 && oldY > 0) { - mEdgeGlowTop.onAbsorb((int) mScroller.getCurrVelocity()); - } else if (y >= rangeY && oldY < rangeY) { - mEdgeGlowBottom.onAbsorb((int) mScroller.getCurrVelocity()); - } + final int scrolledDeltaX = getScrollX() - oldScrollX; + final int scrolledDeltaY = getScrollY() - oldScrollY; + final int unconsumedX = dx - scrolledDeltaX; + final int unconsumedY = dy - scrolledDeltaY; - if (x <= 0 && oldX > 0) { - mEdgeGlowLeft.onAbsorb((int) mScroller.getCurrVelocity()); - } else if (x >= rangeX && oldX < rangeX) { - mEdgeGlowRight.onAbsorb((int) mScroller.getCurrVelocity()); + if (!dispatchNestedScroll(scrolledDeltaX, scrolledDeltaY, unconsumedX, unconsumedY, null, + ViewCompat.TYPE_NON_TOUCH)) { + final int mode = getOverScrollMode(); + final boolean canOverscroll = mode == OVER_SCROLL_ALWAYS + || (mode == OVER_SCROLL_IF_CONTENT_SCROLLS && (rangeX > 0 || rangeY > 0)); + if (canOverscroll) { + ensureGlows(); + if (x <= 0 && oldScrollX > 0) { + mEdgeGlowLeft.onAbsorb((int) mScroller.getCurrVelocity()); + } else if (x >= rangeX && oldScrollX < rangeX) { + mEdgeGlowRight.onAbsorb((int) mScroller.getCurrVelocity()); + } + if (y <= 0 && oldScrollY > 0) { + mEdgeGlowTop.onAbsorb((int) mScroller.getCurrVelocity()); + } else if (y >= rangeY && oldScrollY < rangeY) { + mEdgeGlowBottom.onAbsorb((int) mScroller.getCurrVelocity()); + } } } } -// final boolean fullyConsumedVertical = canScrollVertically() -// && x == getScrollX(); -// final boolean fullyConsumedHorizontal = canScrollHorizontally() -// && x == getScrollY(); -// final boolean fullyConsumedAny = fullyConsumedHorizontal -// || fullyConsumedVertical; - - if (mScroller.isFinished()) { - setScrollState(SCROLL_STATE_IDLE); // setting state to idle will stop this. - } else { - ViewCompat.postInvalidateOnAnimation(this); + // Finally update the scroll positions and post an invalidation + mLastScrollerX = x; + mLastScrollerY = y; + ViewCompat.postInvalidateOnAnimation(this); + } else { + // We can't scroll any more, so stop any indirect scrolling + if (hasNestedScrollingParent(ViewCompat.TYPE_NON_TOUCH)) { + stopNestedScroll(ViewCompat.TYPE_NON_TOUCH); } + // and reset the scroller y + mLastScrollerX = 0; + mLastScrollerY = 0; } } @@ -2101,7 +1674,7 @@ public class HVScrollView extends ViewGroup implements NestedScrollingParent, /* Offset from child's local coordinates to ScrollView coordinates */ offsetDescendantRectToMyCoords(child, mTempRect); - int scrollDelta[] = computeScrollDeltaToGetChildRectOnScreen(mTempRect); + int[] scrollDelta = computeScrollDeltaToGetChildRectOnScreen(mTempRect); if (scrollDelta[0] != 0 || scrollDelta[1] != 0) { scrollBy(scrollDelta[0], scrollDelta[1]); @@ -2117,7 +1690,7 @@ public class HVScrollView extends ViewGroup implements NestedScrollingParent, * @return true if scrolling was performed */ private boolean scrollToChildRect(Rect rect, boolean immediate) { - final int delta[] = computeScrollDeltaToGetChildRectOnScreen(rect); + final int[] delta = computeScrollDeltaToGetChildRectOnScreen(rect); final boolean scroll = delta[0] != 0 || delta[1] != 0; if (scroll) { if (immediate) { @@ -2140,15 +1713,15 @@ public class HVScrollView extends ViewGroup implements NestedScrollingParent, protected int[] computeScrollDeltaToGetChildRectOnScreen(Rect rect) { if (getChildCount() == 0) return new int[]{0, 0}; - int height = getHeight(); int width = getWidth(); + int height = getHeight(); int screenTop = getScrollY(); - int screenBottom = screenTop + height; int screenLeft = getScrollX(); int screenRight = screenLeft + width; + int screenBottom = screenTop + height; - int fadingEdgeY = getVerticalFadingEdgeLength(); int fadingEdgeX = getHorizontalFadingEdgeLength(); + int fadingEdgeY = getVerticalFadingEdgeLength(); // leave room for top fading edge as long as rect isn't at very top if (rect.top > 0) { @@ -2157,18 +1730,49 @@ public class HVScrollView extends ViewGroup implements NestedScrollingParent, if (rect.left > 0) { screenLeft += fadingEdgeX; } - + if (rect.right < getChildAt(0).getHeight()) { + screenRight -= fadingEdgeX; + } // leave room for bottom fading edge as long as rect isn't at very bottom if (rect.bottom < getChildAt(0).getHeight()) { screenBottom -= fadingEdgeY; } - if (rect.right < getChildAt(0).getWidth()) { - screenRight -= fadingEdgeX; - } - int scrollYDelta = 0; int scrollXDelta = 0; + int scrollYDelta = 0; + if (rect.right > screenRight && rect.left > screenLeft) { + // need to move down to get it in view: move down just enough so + // that the entire rectangle is in view (or at least the first + // screen size chunk). + if (rect.width() > width) { + // just enough to get screen size chunk on + scrollXDelta += (rect.left - screenLeft); + } else { + // get entire rect at bottom of screen + scrollXDelta += (rect.right - screenRight); + } + + // make sure we aren't scrolling beyond the end of our content + int right = getChildAt(0).getRight(); + int distanceToRight = right - screenRight; + scrollXDelta = Math.min(scrollXDelta, distanceToRight); + } else if (rect.left < screenLeft && rect.right < screenRight) { + // need to move up to get it in view: move up just enough so that + // entire rectangle is in view (or at least the first screen + // size chunk of it). + + if (rect.width() > width) { + // screen size chunk + scrollXDelta -= (screenRight - rect.right); + } else { + // entire rect at top + scrollXDelta -= (screenLeft - rect.left); + } + + // make sure we aren't scrolling any further than the top our content + scrollXDelta = Math.max(scrollXDelta, -getScrollX()); + } if (rect.bottom > screenBottom && rect.top > screenTop) { // need to move down to get it in view: move down just enough so // that the entire rectangle is in view (or at least the first @@ -2203,40 +1807,6 @@ public class HVScrollView extends ViewGroup implements NestedScrollingParent, // make sure we aren't scrolling any further than the top our content scrollYDelta = Math.max(scrollYDelta, -getScrollY()); } - if (rect.right > screenRight && rect.left > screenLeft) { - // need to move down to get it in view: move down just enough so - // that the entire rectangle is in view (or at least the first - // screen size chunk). - - if (rect.width() > width) { - // just enough to get screen size chunk on - scrollXDelta += (rect.left - screenLeft); - } else { - // get entire rect at bottom of screen - scrollXDelta += (rect.right - screenRight); - } - - // make sure we aren't scrolling beyond the end of our content - int right = getChildAt(0).getRight(); - int distanceToRight = right - screenRight; - scrollXDelta = Math.min(scrollXDelta, distanceToRight); - - } else if (rect.left < screenLeft && rect.right < screenRight) { - // need to move up to get it in view: move up just enough so that - // entire rectangle is in view (or at least the first screen - // size chunk of it). - - if (rect.width() > width) { - // screen size chunk - scrollXDelta -= (screenRight - rect.right); - } else { - // entire rect at top - scrollXDelta -= (screenLeft - rect.left); - } - - // make sure we aren't scrolling any further than the top our content - scrollXDelta = Math.max(scrollXDelta, -getScrollX()); - } return new int[]{scrollXDelta, scrollYDelta}; } @@ -2256,7 +1826,7 @@ public class HVScrollView extends ViewGroup implements NestedScrollingParent, * When looking for focus in children of a scroll view, need to be a little * more careful not to give focus to something that is scrolled off screen. *

- * This is more expensive than the default {@link ViewGroup} + * This is more expensive than the default {@link android.view.ViewGroup} * implementation, otherwise this behavior might have been made the default. */ @Override @@ -2271,23 +1841,17 @@ public class HVScrollView extends ViewGroup implements NestedScrollingParent, direction = View.FOCUS_UP; } - final View nextFocus = previouslyFocusedRect == null ? - FocusFinder.getInstance().findNextFocus(this, null, direction) : - FocusFinder.getInstance().findNextFocusFromRect(this, - previouslyFocusedRect, direction); + final View nextFocus = previouslyFocusedRect == null + ? FocusFinder.getInstance().findNextFocus(this, null, direction) + : FocusFinder.getInstance().findNextFocusFromRect( + this, previouslyFocusedRect, direction); if (nextFocus == null) { return false; } - if (canScrollHorizontally()) { - if (isOffScreenX(nextFocus)) { - return false; - } - } else if (canScrollVertically()) { - if (isOffScreenY(nextFocus)) { - return false; - } + if (isOffScreen(nextFocus)) { + return false; } return nextFocus.requestFocus(direction, previouslyFocusedRect); @@ -2309,6 +1873,40 @@ public class HVScrollView extends ViewGroup implements NestedScrollingParent, super.requestLayout(); } + @Override + protected void onLayout(boolean changed, int l, int t, int r, int b) { + super.onLayout(changed, l, t, r, b); + mIsLayoutDirty = false; + // Give a child focus if it needs it + if (mChildToScrollTo != null && isViewDescendantOf(mChildToScrollTo, this)) { + scrollToChild(mChildToScrollTo); + } + mChildToScrollTo = null; + + if (!mIsLaidOut) { + if (mSavedState != null) { + scrollTo(mSavedState.scrollPositionX, mSavedState.scrollPositionY); + mSavedState = null; + } // mScrollY default value is "0" + + final int childWidth = (getChildCount() > 0) ? getChildAt(0).getMeasuredWidth() : 0; + final int childHeight = (getChildCount() > 0) ? getChildAt(0).getMeasuredHeight() : 0; + final int scrollRangeX = Math.max(0, + childWidth - (b - t - getPaddingLeft() - getPaddingRight())); + final int scrollRangeY = Math.max(0, + childHeight - (b - t - getPaddingBottom() - getPaddingTop())); + + // Don't forget to clamp + int scrollX = Math.max(0, Math.min(scrollRangeX, getScrollX())); + int scrollY = Math.max(0, Math.min(scrollRangeY, getScrollY())); + scrollTo(scrollX, scrollY); + } + + // Calling this with the present values causes it to re-claim them + scrollTo(getScrollX(), getScrollY()); + mIsLaidOut = true; + } + @Override public void onAttachedToWindow() { super.onAttachedToWindow(); @@ -2321,17 +1919,18 @@ public class HVScrollView extends ViewGroup implements NestedScrollingParent, super.onSizeChanged(w, h, oldw, oldh); View currentFocused = findFocus(); - if (null == currentFocused || this == currentFocused) + if (null == currentFocused || this == currentFocused) { return; + } // If the currently-focused view was visible on the screen when the // screen was at the old height, then scroll the screen to make that // view visible with the new screen height. - if (isWithinDeltaOfScreenX(currentFocused, 0, oldw) || isWithinDeltaOfScreenY(currentFocused, 0, oldh)) { + if (isWithinDeltaOfScreen(currentFocused, oldw, oldh)) { currentFocused.getDrawingRect(mTempRect); offsetDescendantRectToMyCoords(currentFocused, mTempRect); - int scrollDelta[] = computeScrollDeltaToGetChildRectOnScreen(mTempRect); - doScrollXY(scrollDelta); + int[] scrollDelta = computeScrollDeltaToGetChildRectOnScreen(mTempRect); + doScroll(scrollDelta); } } @@ -2347,68 +1946,63 @@ public class HVScrollView extends ViewGroup implements NestedScrollingParent, return (theParent instanceof ViewGroup) && isViewDescendantOf((View) theParent, parent); } - private boolean fling(int velocityX, int velocityY) { - final boolean canScrollHorizontal = canScrollHorizontally(); - final boolean canScrollVertical = canScrollVertically(); - - if (!canScrollHorizontal || Math.abs(velocityX) < mMinimumVelocity) { - velocityX = 0; + /** + * Fling the scroll view + * + * @param velocityX The initial velocity in the X direction. Positive + * numbers mean that the finger/cursor is moving right to the screen, + * which means we want to scroll towards the left. + * @param velocityY The initial velocity in the Y direction. Positive + * numbers mean that the finger/cursor is moving down the screen, + * which means we want to scroll towards the top. + */ + public void fling(int velocityX, int velocityY) { + if (getChildCount() > 0) { + int axes = getAxes(); + startNestedScroll(axes, ViewCompat.TYPE_NON_TOUCH); + mScroller.fling(getScrollX(), getScrollY(), // start + velocityX, velocityY, // velocities + Integer.MIN_VALUE, Integer.MAX_VALUE, // x + Integer.MIN_VALUE, Integer.MAX_VALUE, // y + 0, 0); // overscroll + mLastScrollerX = getScrollX(); + mLastScrollerY = getScrollY(); + ViewCompat.postInvalidateOnAnimation(this); } - if (!canScrollVertical || Math.abs(velocityY) < mMinimumVelocity) { - velocityY = 0; - } - if (velocityX == 0 && velocityY == 0) { - // If we don't have any velocity, return false - return false; - } - - if (!dispatchNestedPreFling(velocityX, velocityY)) { - final int scrollY = getScrollY(); - final int scrollX = getScrollX(); - final boolean canFlingY = (scrollY > 0 || velocityY > 0) && - (scrollY < getScrollRangeY() || velocityY < 0); - final boolean canFlingX = (scrollX > 0 || velocityX > 0) && - (scrollX < getScrollRangeX() || velocityX < 0); - boolean canFling = canFlingY || canFlingX; - dispatchNestedFling(velocityX, velocityY, canFling); - if (canFling) { - setScrollState(SCROLL_STATE_SETTLING); - - velocityX = Math.max(-mMaximumVelocity, Math.min(velocityX, mMaximumVelocity)); - velocityY = Math.max(-mMaximumVelocity, Math.min(velocityY, mMaximumVelocity)); - - int height = getHeight() - getPaddingBottom() - getPaddingTop(); - int width = getWidth() - getPaddingRight() - getPaddingLeft(); - int bottom = getChildAt(0).getHeight(); - int right = getChildAt(0).getWidth(); - mScroller.fling(getScrollX(), getScrollY(), velocityX, velocityY, 0, Math.max(0, right - width), 0, - Math.max(0, bottom - height), width / 2, height / 2); - -// ViewCompat.postInvalidateOnAnimation(this); - return true; - } - } - return false; } -// private void endDrag() { -// mIsBeingDragged = false; -// -// recycleVelocityTracker(); -// stopNestedScroll(); -// -// if (mEdgeGlowTop != null) { -// mEdgeGlowTop.onRelease(); -// mEdgeGlowBottom.onRelease(); -// mEdgeGlowLeft.onRelease(); -// mEdgeGlowRight.onRelease(); -// } -// } + private void flingWithNestedDispatch(int velocityX, int velocityY) { + final int scrollX = getScrollX(); + final int scrollY = getScrollY(); + final boolean canFling = ((scrollY > 0 || velocityY > 0) + && (scrollY < getScrollRangeY() || velocityY < 0)) + || ((scrollX > 0 || velocityX > 0) + && (scrollX < getScrollRangeX() || velocityX < 0)); + if (!dispatchNestedPreFling(velocityX, velocityY)) { + dispatchNestedFling(velocityX, velocityY, canFling); + fling(velocityX, velocityY); + } + + } + + private void endDrag() { + mIsBeingDragged = false; + + recycleVelocityTracker(); + stopNestedScroll(ViewCompat.TYPE_TOUCH); + + if (mEdgeGlowTop != null) { + mEdgeGlowTop.onRelease(); + mEdgeGlowBottom.onRelease(); + mEdgeGlowLeft.onRelease(); + mEdgeGlowRight.onRelease(); + } + } /** * {@inheritDoc} *

- * This version also clamps the scrolling to the bounds of our child. + *

This version also clamps the scrolling to the bounds of our child. */ @Override public void scrollTo(int x, int y) { @@ -2424,13 +2018,13 @@ public class HVScrollView extends ViewGroup implements NestedScrollingParent, } private void ensureGlows() { - if (ViewCompat.getOverScrollMode(this) != ViewCompat.OVER_SCROLL_NEVER) { + if (getOverScrollMode() != View.OVER_SCROLL_NEVER) { if (mEdgeGlowTop == null) { Context context = getContext(); - mEdgeGlowTop = new EdgeEffectCompat(context); - mEdgeGlowBottom = new EdgeEffectCompat(context); - mEdgeGlowLeft = new EdgeEffectCompat(context); - mEdgeGlowRight = new EdgeEffectCompat(context); + mEdgeGlowTop = new EdgeEffect(context); + mEdgeGlowBottom = new EdgeEffect(context); + mEdgeGlowLeft = new EdgeEffect(context); + mEdgeGlowRight = new EdgeEffect(context); } } else { mEdgeGlowTop = null; @@ -2441,8 +2035,8 @@ public class HVScrollView extends ViewGroup implements NestedScrollingParent, } @Override - public void dispatchDraw(Canvas canvas) { - super.dispatchDraw(canvas); + public void draw(Canvas canvas) { + super.draw(canvas); if (mEdgeGlowTop != null) { final int scrollX = getScrollX(); final int scrollY = getScrollY(); @@ -2450,38 +2044,19 @@ public class HVScrollView extends ViewGroup implements NestedScrollingParent, final int restoreCount = canvas.save(); final int width = getWidth() - getPaddingLeft() - getPaddingRight(); - canvas.translate(getPaddingLeft() + scrollX, Math.min(0, scrollY)); + canvas.translate(getPaddingLeft(), Math.min(0, scrollY)); mEdgeGlowTop.setSize(width, getHeight()); if (mEdgeGlowTop.draw(canvas)) { ViewCompat.postInvalidateOnAnimation(this); } canvas.restoreToCount(restoreCount); } - if (!mEdgeGlowBottom.isFinished()) { - final int restoreCount = canvas.save(); - final int width = getWidth() - getPaddingLeft() - getPaddingRight(); - final int height = getHeight(); - - canvas.translate(-width + getPaddingLeft() + scrollX, - Math.max(getScrollRangeY(), scrollY) + height); - canvas.rotate(180, width, 0); - mEdgeGlowBottom.setSize(width, height); - if (mEdgeGlowBottom.draw(canvas)) { - ViewCompat.postInvalidateOnAnimation(this); - } - canvas.restoreToCount(restoreCount); - } if (!mEdgeGlowLeft.isFinished()) { - final int restoreCount = canvas.save(); - final int width = getWidth(); final int height = getHeight() - getPaddingTop() - getPaddingBottom(); - canvas.rotate(270); - - canvas.translate(-height + getPaddingTop() - scrollY, Math.min(0, scrollX)); -// canvas.rotate(90, 0, 0); - mEdgeGlowLeft.setSize(height, width); + canvas.translate(getPaddingTop(), Math.min(0, scrollX)); + mEdgeGlowLeft.setSize(getWidth(), height); if (mEdgeGlowLeft.draw(canvas)) { ViewCompat.postInvalidateOnAnimation(this); } @@ -2492,11 +2067,24 @@ public class HVScrollView extends ViewGroup implements NestedScrollingParent, final int width = getWidth(); final int height = getHeight() - getPaddingTop() - getPaddingBottom(); - canvas.rotate(90); - canvas.translate(-getPaddingTop() + scrollY, - -(Math.max(getScrollRangeX(), scrollX) + width)); - mEdgeGlowRight.setSize(height, width); - if (mEdgeGlowRight.draw(canvas)) { + canvas.translate(Math.max(getScrollRangeX(), scrollX) + width, -height + getPaddingTop()); + canvas.rotate(180, 0, height); + mEdgeGlowBottom.setSize(width, height); + if (mEdgeGlowBottom.draw(canvas)) { + ViewCompat.postInvalidateOnAnimation(this); + } + canvas.restoreToCount(restoreCount); + } + if (!mEdgeGlowBottom.isFinished()) { + final int restoreCount = canvas.save(); + final int width = getWidth() - getPaddingLeft() - getPaddingRight(); + final int height = getHeight(); + + canvas.translate(-width + getPaddingLeft(), + Math.max(getScrollRangeY(), scrollY) + height); + canvas.rotate(180, width, 0); + mEdgeGlowBottom.setSize(width, height); + if (mEdgeGlowBottom.draw(canvas)) { ViewCompat.postInvalidateOnAnimation(this); } canvas.restoreToCount(restoreCount); @@ -2551,49 +2139,53 @@ public class HVScrollView extends ViewGroup implements NestedScrollingParent, protected Parcelable onSaveInstanceState() { Parcelable superState = super.onSaveInstanceState(); SavedState ss = new SavedState(superState); - ss.scrollYPosition = getScrollY(); - ss.scrollXPosition = getScrollX(); + ss.scrollPositionX = getScrollX(); + ss.scrollPositionY = getScrollY(); return ss; } static class SavedState extends BaseSavedState { - public int scrollYPosition; - public int scrollXPosition; + public int scrollPositionX; + public int scrollPositionY; SavedState(Parcelable superState) { super(superState); } - public SavedState(Parcel source) { + SavedState(Parcel source) { super(source); - scrollYPosition = source.readInt(); - scrollXPosition = source.readInt(); + scrollPositionX = source.readInt(); + scrollPositionY = source.readInt(); } @Override public void writeToParcel(Parcel dest, int flags) { super.writeToParcel(dest, flags); - dest.writeInt(scrollYPosition); - dest.writeInt(scrollXPosition); + dest.writeInt(scrollPositionX); + dest.writeInt(scrollPositionY); } @Override public String toString() { return "HorizontalScrollView.SavedState{" + Integer.toHexString(System.identityHashCode(this)) - + " scrollXPosition=" + scrollXPosition + " scrollYPosition=" + scrollYPosition + "}"; + + " scrollPositionX=" + scrollPositionX + + ", scrollPositionY=" + scrollPositionY + + "}"; } - public static final Creator CREATOR - = new Creator() { - public SavedState createFromParcel(Parcel in) { - return new SavedState(in); - } + public static final Parcelable.Creator CREATOR = + new Parcelable.Creator() { + @Override + public SavedState createFromParcel(Parcel in) { + return new SavedState(in); + } - public SavedState[] newArray(int size) { - return new SavedState[size]; - } - }; + @Override + public SavedState[] newArray(int size) { + return new SavedState[size]; + } + }; } static class AccessibilityDelegate extends AccessibilityDelegateCompat { @@ -2610,14 +2202,10 @@ public class HVScrollView extends ViewGroup implements NestedScrollingParent, case AccessibilityNodeInfoCompat.ACTION_SCROLL_FORWARD: { final int viewportHeight = nsvHost.getHeight() - nsvHost.getPaddingBottom() - nsvHost.getPaddingTop(); - final int viewportWidth = nsvHost.getWidth() - nsvHost.getPaddingRight() - - nsvHost.getPaddingLeft(); final int targetScrollY = Math.min(nsvHost.getScrollY() + viewportHeight, nsvHost.getScrollRangeY()); - final int targetScrollX = Math.min(nsvHost.getScrollX() + viewportWidth, - nsvHost.getScrollRangeX()); - if (targetScrollY != nsvHost.getScrollY() || targetScrollX != nsvHost.getScrollX()) { - nsvHost.smoothScrollTo(targetScrollX, targetScrollY); + if (targetScrollY != nsvHost.getScrollY()) { + nsvHost.smoothScrollTo(0, targetScrollY); return true; } } @@ -2625,12 +2213,9 @@ public class HVScrollView extends ViewGroup implements NestedScrollingParent, case AccessibilityNodeInfoCompat.ACTION_SCROLL_BACKWARD: { final int viewportHeight = nsvHost.getHeight() - nsvHost.getPaddingBottom() - nsvHost.getPaddingTop(); - final int viewportWidth = nsvHost.getWidth() - nsvHost.getPaddingRight() - - nsvHost.getPaddingLeft(); final int targetScrollY = Math.max(nsvHost.getScrollY() - viewportHeight, 0); - final int targetScrollX = Math.min(nsvHost.getScrollX() - viewportWidth, 0); - if (targetScrollY != nsvHost.getScrollY() || targetScrollX != nsvHost.getScrollX()) { - nsvHost.smoothScrollTo(targetScrollX, targetScrollY); + if (targetScrollY != nsvHost.getScrollY()) { + nsvHost.smoothScrollTo(0, targetScrollY); return true; } } @@ -2645,14 +2230,13 @@ public class HVScrollView extends ViewGroup implements NestedScrollingParent, final HVScrollView nsvHost = (HVScrollView) host; info.setClassName(ScrollView.class.getName()); if (nsvHost.isEnabled()) { - final int scrollRangeY = nsvHost.getScrollRangeY(); - final int scrollRangeX = nsvHost.getScrollRangeX(); - if (scrollRangeY > 0 || scrollRangeX > 0) { + final int scrollRange = nsvHost.getScrollRangeY(); + if (scrollRange > 0) { info.setScrollable(true); - if (nsvHost.getScrollY() > 0 || nsvHost.getScrollX() > 0) { + if (nsvHost.getScrollY() > 0) { info.addAction(AccessibilityNodeInfoCompat.ACTION_SCROLL_BACKWARD); } - if (nsvHost.getScrollY() < scrollRangeY || nsvHost.getScrollX() < scrollRangeX) { + if (nsvHost.getScrollY() < scrollRange) { info.addAction(AccessibilityNodeInfoCompat.ACTION_SCROLL_FORWARD); } } @@ -2664,56 +2248,12 @@ public class HVScrollView extends ViewGroup implements NestedScrollingParent, super.onInitializeAccessibilityEvent(host, event); final HVScrollView nsvHost = (HVScrollView) host; event.setClassName(ScrollView.class.getName()); - final AccessibilityRecordCompat record = AccessibilityEventCompat.asRecord(event); - final boolean scrollableX = nsvHost.getScrollRangeY() > 0; - final boolean scrollableY = nsvHost.getScrollRangeX() > 0; - boolean scrollable = scrollableX || scrollableY; - record.setScrollable(scrollable); - record.setScrollX(nsvHost.getScrollX()); - record.setScrollY(nsvHost.getScrollY()); - record.setMaxScrollX(nsvHost.getScrollRangeX()); - record.setMaxScrollY(nsvHost.getScrollRangeY()); - } - } - - - public void setFillViewportH(boolean fillViewportH) { - if (mFillViewportH != fillViewportH) { - this.mFillViewportH = fillViewportH; - requestLayout(); - } - } - - public void setFillViewportV(boolean fillViewportV) { - if (mFillViewportV != fillViewportV) { - this.mFillViewportV = fillViewportV; - requestLayout(); - } - } - - public void setFillViewportHV(boolean fillViewportH, boolean fillViewportV) { - if (mFillViewportH != fillViewportH || mFillViewportV != fillViewportV) { - this.mFillViewportH = fillViewportH; - this.mFillViewportV = fillViewportV; - requestLayout(); - } - } - - @Override - public boolean canScrollHorizontally(int direction) { - if (direction > 0) { - return getScrollX() < getScrollRangeX(); - } else { - return getScrollX() > 0 && getScrollRangeX() > 0; - } - } - - @Override - public boolean canScrollVertically(int direction) { - if (direction > 0) { - return getScrollY() < getScrollRangeY(); - } else { - return getScrollY() > 0 && getScrollRangeY() > 0; + final boolean scrollable = nsvHost.getScrollRangeY() > 0; + event.setScrollable(scrollable); + event.setScrollX(nsvHost.getScrollX()); + event.setScrollY(nsvHost.getScrollY()); + AccessibilityRecordCompat.setMaxScrollX(event, nsvHost.getScrollX()); + AccessibilityRecordCompat.setMaxScrollY(event, nsvHost.getScrollRangeY()); } } } \ No newline at end of file diff --git a/doric-android/doric/src/main/java/pub/doric/widget/NewHVScrollView.java b/doric-android/doric/src/main/java/pub/doric/widget/NewHVScrollView.java new file mode 100644 index 00000000..3b0aa002 --- /dev/null +++ b/doric-android/doric/src/main/java/pub/doric/widget/NewHVScrollView.java @@ -0,0 +1,2719 @@ +package pub.doric.widget; + +import android.content.Context; +import android.graphics.Canvas; +import android.graphics.Rect; +import android.os.Build; +import android.os.Bundle; +import android.os.Parcel; +import android.os.Parcelable; +import android.util.AttributeSet; +import android.util.Log; +import android.util.TypedValue; +import android.view.FocusFinder; +import android.view.KeyEvent; +import android.view.MotionEvent; +import android.view.VelocityTracker; +import android.view.View; +import android.view.ViewConfiguration; +import android.view.ViewGroup; +import android.view.ViewParent; +import android.view.accessibility.AccessibilityEvent; +import android.view.animation.AnimationUtils; +import android.widget.ScrollView; + +import androidx.core.view.AccessibilityDelegateCompat; +import androidx.core.view.InputDeviceCompat; +import androidx.core.view.MotionEventCompat; +import androidx.core.view.NestedScrollingChild; +import androidx.core.view.NestedScrollingChildHelper; +import androidx.core.view.NestedScrollingParent; +import androidx.core.view.NestedScrollingParentHelper; +import androidx.core.view.ScrollingView; +import androidx.core.view.VelocityTrackerCompat; +import androidx.core.view.ViewCompat; +import androidx.core.view.accessibility.AccessibilityEventCompat; +import androidx.core.view.accessibility.AccessibilityNodeInfoCompat; +import androidx.core.view.accessibility.AccessibilityRecordCompat; +import androidx.core.widget.EdgeEffectCompat; +import androidx.core.widget.ScrollerCompat; + +import java.util.List; + +public class NewHVScrollView extends ViewGroup implements NestedScrollingParent, + NestedScrollingChild, ScrollingView { + private boolean DEBUG = false; + static final int ANIMATED_SCROLL_GAP = 250; + + static final float MAX_SCROLL_FACTOR = 0.5f; + + private static final String TAG = "NestedScrollView"; + private boolean mChildLayoutCenter; + private int mInitialTouchY; + private int mInitialTouchX; +// private boolean mIsBeingDragged; + + public void setChildLayoutCenter(boolean childLayoutCenter) { + if (mChildLayoutCenter != childLayoutCenter) { + this.mChildLayoutCenter = childLayoutCenter; + requestLayout(); + } + } + + /** + * Interface definition for a callback to be invoked when the scroll + * X or Y positions of a view change. + *

+ * This version of the interface works on all versions of Android, back to API v4. + * + * @see #setOnScrollChangeListener(OnScrollChangeListener) + */ + public interface OnScrollChangeListener { + /** + * Called when the scroll position of a view changes. + * + * @param v The view whose scroll position has changed. + * @param scrollX Current horizontal scroll origin. + * @param scrollY Current vertical scroll origin. + * @param oldScrollX Previous horizontal scroll origin. + * @param oldScrollY Previous vertical scroll origin. + */ + void onScrollChange(NewHVScrollView v, int scrollX, int scrollY, + int oldScrollX, int oldScrollY); + } + + private long mLastScroll; + + private final Rect mTempRect = new Rect(); + private ScrollerCompat mScroller; + private EdgeEffectCompat mEdgeGlowTop; + private EdgeEffectCompat mEdgeGlowBottom; + private EdgeEffectCompat mEdgeGlowLeft; + private EdgeEffectCompat mEdgeGlowRight; + + /** + * Position of the last motion event. + */ + private int mLastMotionY; + + private int mLastMotionX; + + /** + * True when the layout has changed but the traversal has not come through yet. + * Ideally the view hierarchy would keep track of this for us. + */ + private boolean mIsLayoutDirty = true; + private boolean mIsLaidOut = false; + + /** + * The child to give focus to in the event that a child has requested focus while the + * layout is dirty. This prevents the scroll from being wrong if the child has not been + * laid out before requesting focus. + */ + private View mChildToScrollTo = null; + +// /** +// * True if the user is currently dragging this ScrollView around. This is +// * not the same as 'is being flinged', which can be checked by +// * mScroller.isFinished() (flinging begins when the user lifts his finger). +// */ +// private boolean mIsBeingDragged = false; + + /** + * The RecyclerView is not currently scrolling. + */ + public static final int SCROLL_STATE_IDLE = 0; + + /** + * The RecyclerView is currently being dragged by outside input such as user touch input. + */ + public static final int SCROLL_STATE_DRAGGING = 1; + + /** + * The RecyclerView is currently animating to a final position while not under + * outside control. + */ + public static final int SCROLL_STATE_SETTLING = 2; + + // Touch/scrolling handling + + private int mScrollState = SCROLL_STATE_IDLE; + + /** + * Determines speed during touch scrolling + */ + private VelocityTracker mVelocityTracker; + + /** + * Whether arrow scrolling is animated. + */ + private boolean mSmoothScrollingEnabled = true; + + private int mTouchSlop; + private int mMinimumVelocity; + private int mMaximumVelocity; + + /** + * ID of the active pointer. This is used to retain consistency during + * drags/flings if multiple pointers are used. + */ + private int mActivePointerId = INVALID_POINTER; + + /** + * Used during scrolling to retrieve the new offset within the window. + */ + private final int[] mScrollOffset = new int[2]; + private final int[] mScrollConsumed = new int[2]; + private int mNestedYOffset; + private int mNestedXOffset; + + /** + * Sentinel value for no current active pointer. + * Used by {@link #mActivePointerId}. + */ + private static final int INVALID_POINTER = -1; + + private SavedState mSavedState; + + private static final AccessibilityDelegate ACCESSIBILITY_DELEGATE = new AccessibilityDelegate(); + + private boolean mFillViewportH; + private boolean mFillViewportV; + private final NestedScrollingParentHelper mParentHelper; + private final NestedScrollingChildHelper mChildHelper; + + private float mVerticalScrollFactor; + + private OnScrollChangeListener mOnScrollChangeListener; + + public NewHVScrollView(Context context) { + this(context, null); + } + + public NewHVScrollView(Context context, AttributeSet attrs) { + this(context, attrs, 0); + } + + public static final int SCROLL_ORIENTATION_NONE = 0; + public static final int SCROLL_ORIENTATION_HORIZONTAL = 1; + public static final int SCROLL_ORIENTATION_VERTICAL = 2; + public static final int SCROLL_ORIENTATION_BOTH = 3; + private int mScrollOrientation; + + public void setScrollOrientation(int scrollOrientation) { + this.mScrollOrientation = scrollOrientation; + requestLayout(); + } + + public int getScrollOrientation() { + return mScrollOrientation; + } + + public NewHVScrollView(Context context, AttributeSet attrs, int defStyleAttr) { + super(context, attrs, defStyleAttr); + initScrollView(); + + mChildLayoutCenter = false; + mFillViewportH = true; + mFillViewportV = false; + mScrollOrientation = SCROLL_ORIENTATION_BOTH; + + mParentHelper = new NestedScrollingParentHelper(this); + mChildHelper = new NestedScrollingChildHelper(this); + + // ...because why else would you be using this widget? + setNestedScrollingEnabled(true); + + ViewCompat.setAccessibilityDelegate(this, ACCESSIBILITY_DELEGATE); + } + + // NestedScrollingChild + + @Override + public void setNestedScrollingEnabled(boolean enabled) { + mChildHelper.setNestedScrollingEnabled(enabled); + } + + @Override + public boolean isNestedScrollingEnabled() { + return mChildHelper.isNestedScrollingEnabled(); + } + + @Override + public boolean startNestedScroll(int axes) { + return mChildHelper.startNestedScroll(axes); + } + + @Override + public void stopNestedScroll() { + mChildHelper.stopNestedScroll(); + } + + @Override + public boolean hasNestedScrollingParent() { + return mChildHelper.hasNestedScrollingParent(); + } + + @Override + public boolean dispatchNestedScroll(int dxConsumed, int dyConsumed, int dxUnconsumed, + int dyUnconsumed, int[] offsetInWindow) { + return mChildHelper.dispatchNestedScroll(dxConsumed, dyConsumed, dxUnconsumed, dyUnconsumed, + offsetInWindow); + } + + @Override + public boolean dispatchNestedPreScroll(int dx, int dy, int[] consumed, int[] offsetInWindow) { + return mChildHelper.dispatchNestedPreScroll(dx, dy, consumed, offsetInWindow); + } + + @Override + public boolean dispatchNestedFling(float velocityX, float velocityY, boolean consumed) { + return mChildHelper.dispatchNestedFling(velocityX, velocityY, consumed); + } + + @Override + public boolean dispatchNestedPreFling(float velocityX, float velocityY) { + return mChildHelper.dispatchNestedPreFling(velocityX, velocityY); + } + + // NestedScrollingParent + + @Override + public boolean onStartNestedScroll(View child, View target, int nestedScrollAxes) { + return ((nestedScrollAxes & ViewCompat.SCROLL_AXIS_VERTICAL) != 0 && canScrollVertically()) || ((nestedScrollAxes & ViewCompat.SCROLL_AXIS_HORIZONTAL) != 0 && canScrollHorizontally()); + } + + @Override + public void onNestedScrollAccepted(View child, View target, int nestedScrollAxes) { + mParentHelper.onNestedScrollAccepted(child, target, nestedScrollAxes); + int axes = ViewCompat.SCROLL_AXIS_NONE; + axes = canScrollHorizontally() ? axes | ViewCompat.SCROLL_AXIS_HORIZONTAL : axes; + axes = canScrollVertically() ? axes | ViewCompat.SCROLL_AXIS_VERTICAL : axes; + startNestedScroll(axes); + } + + @Override + public void onStopNestedScroll(View target) { + mParentHelper.onStopNestedScroll(target); + stopNestedScroll(); + } + + public boolean canScrollHorizontally() { + return (mScrollOrientation & SCROLL_ORIENTATION_HORIZONTAL) == SCROLL_ORIENTATION_HORIZONTAL; + } + + public boolean canScrollVertically() { + return (mScrollOrientation & SCROLL_ORIENTATION_VERTICAL) == SCROLL_ORIENTATION_VERTICAL; + } + + + @Override + public void onNestedScroll(View target, int dxConsumed, int dyConsumed, int dxUnconsumed, + int dyUnconsumed) { + final int oldScrollY = getScrollY(); + final int oldScrollX = getScrollX(); + scrollBy(canScrollHorizontally() ? dxUnconsumed : 0, canScrollVertically() ? dyUnconsumed : 0); + final int myConsumedY = getScrollY() - oldScrollY; + final int myConsumedX = getScrollX() - oldScrollX; + final int myUnconsumedY = dyUnconsumed - myConsumedY; + final int myUnconsumedX = dxUnconsumed - myConsumedX; + dispatchNestedScroll(myConsumedX, myConsumedY, myUnconsumedX, myUnconsumedY, null); + } + + @Override + public void onNestedPreScroll(View target, int dx, int dy, int[] consumed) { + dispatchNestedPreScroll(dx, dy, consumed, null); + } + + @Override + public boolean onNestedFling(View target, float velocityX, float velocityY, boolean consumed) { + if (!consumed) { + fling((int) velocityX, (int) velocityY); + return true; + } + return false; + } + + @Override + public boolean onNestedPreFling(View target, float velocityX, float velocityY) { + return dispatchNestedPreFling(velocityX, velocityY); + } + + @Override + public int getNestedScrollAxes() { + return mParentHelper.getNestedScrollAxes(); + } + + // ScrollView import + + public boolean shouldDelayChildPressedState() { + return true; + } + + @Override + protected float getLeftFadingEdgeStrength() { + if (getChildCount() == 0 || !canScrollHorizontally()) { + return 0.0f; + } + + final int length = getHorizontalFadingEdgeLength(); + final int scrollX = getScrollX(); + if (scrollX < length) { + return scrollX / (float) length; + } + return 1.0f; + } + + @Override + protected float getTopFadingEdgeStrength() { + if (getChildCount() == 0 || !canScrollVertically()) { + return 0.0f; + } + + final int length = getVerticalFadingEdgeLength(); + final int scrollY = getScrollY(); + if (scrollY < length) { + return scrollY / (float) length; + } + return 1.0f; + } + + @Override + protected float getBottomFadingEdgeStrength() { + if (getChildCount() == 0 || !canScrollVertically()) { + return 0.0f; + } + + final int length = getVerticalFadingEdgeLength(); + final int bottomEdge = getHeight() - getPaddingBottom(); + final int span = getChildAt(0).getBottom() - getScrollY() - bottomEdge; + if (span < length) { + return span / (float) length; + } + + return 1.0f; + } + + @Override + protected float getRightFadingEdgeStrength() { + if (getChildCount() == 0 || !canScrollHorizontally()) { + return 0.0f; + } + + final int length = getHorizontalFadingEdgeLength(); + final int rightEdge = getWidth() - getPaddingRight(); + final int span = getChildAt(0).getRight() - getScrollX() - rightEdge; + if (span < length) { + return span / (float) length; + } + + return 1.0f; + } + + /** + * @return The maximum amount this scroll view will scroll in response to + * an arrow event. + */ + public int getMaxScrollAmountY() { + return (int) (MAX_SCROLL_FACTOR * getHeight()); + } + + public int getMaxScrollAmountX() { + return (int) (MAX_SCROLL_FACTOR * getWidth()); + } + + private void initScrollView() { + mScroller = ScrollerCompat.create(getContext(), null); + setFocusable(true); + setDescendantFocusability(FOCUS_AFTER_DESCENDANTS); + setWillNotDraw(false); + final ViewConfiguration configuration = ViewConfiguration.get(getContext()); + mTouchSlop = configuration.getScaledTouchSlop(); + mMinimumVelocity = configuration.getScaledMinimumFlingVelocity(); + mMaximumVelocity = configuration.getScaledMaximumFlingVelocity(); + } + + @Override + public void addView(View child) { + if (getChildCount() > 0) { + throw new IllegalStateException("ScrollView can host only one direct child"); + } + + super.addView(child); + } + + @Override + public void addView(View child, int index) { + if (getChildCount() > 0) { + throw new IllegalStateException("ScrollView can host only one direct child"); + } + + super.addView(child, index); + } + + @Override + public void addView(View child, LayoutParams params) { + if (getChildCount() > 0) { + throw new IllegalStateException("ScrollView can host only one direct child"); + } + + super.addView(child, params); + } + + @Override + public void addView(View child, int index, LayoutParams params) { + if (getChildCount() > 0) { + throw new IllegalStateException("ScrollView can host only one direct child"); + } + + super.addView(child, index, params); + } + + /** + * Register a callback to be invoked when the scroll X or Y positions of + * this view change. + * This version of the method works on all versions of Android, back to API v4. + * + * @param l The listener to notify when the scroll X or Y position changes. + * @see View#getScrollX() + * @see View#getScrollY() + */ + public void setOnScrollChangeListener(OnScrollChangeListener l) { + mOnScrollChangeListener = l; + } + + /** + * @return Returns true this ScrollView can be scrolled + */ + private boolean canScroll() { + View child = getChildAt(0); + if (child != null) { + int childHeight = child.getHeight(); + int childWidth = child.getWidth(); + boolean canY = getHeight() < childHeight + getPaddingTop() + getPaddingBottom(); + canY |= canScrollVertically(); + boolean canX = getWidth() < childWidth + getPaddingLeft() + getPaddingRight(); + canX |= canScrollHorizontally(); + return canX || canY; + } + return false; + } + + /** + * @return Whether arrow scrolling will animate its transition. + */ + public boolean isSmoothScrollingEnabled() { + return mSmoothScrollingEnabled; + } + + /** + * Set whether arrow scrolling will animate its transition. + * + * @param smoothScrollingEnabled whether arrow scrolling will animate its transition + */ + public void setSmoothScrollingEnabled(boolean smoothScrollingEnabled) { + mSmoothScrollingEnabled = smoothScrollingEnabled; + } + + @Override + protected void onScrollChanged(int l, int t, int oldl, int oldt) { + super.onScrollChanged(l, t, oldl, oldt); + + if (mOnScrollChangeListener != null) { + mOnScrollChangeListener.onScrollChange(this, l, t, oldl, oldt); + } + } + + @Override + public boolean dispatchKeyEvent(KeyEvent event) { + // Let the focused view and/or our descendants get the key first + return super.dispatchKeyEvent(event) || executeKeyEvent(event); + } + + /** + * You can call this function yourself to have the scroll view perform + * scrolling from a key event, just as if the event had been dispatched to + * it by the view hierarchy. + * + * @param event The key event to execute. + * @return Return true if the event was handled, else false. + */ + public boolean executeKeyEvent(KeyEvent event) { + mTempRect.setEmpty(); + + if (!canScroll()) { + if (isFocused() && event.getKeyCode() != KeyEvent.KEYCODE_BACK) { + View currentFocused = findFocus(); + if (currentFocused == this) currentFocused = null; + View nextFocused = FocusFinder.getInstance().findNextFocus(this, + currentFocused, View.FOCUS_DOWN); + return nextFocused != null + && nextFocused != this + && nextFocused.requestFocus(View.FOCUS_DOWN); + } + return false; + } + + boolean handled = false; + if (event.getAction() == KeyEvent.ACTION_DOWN) { + switch (event.getKeyCode()) { + case KeyEvent.KEYCODE_DPAD_UP: + if (canScrollVertically()) { + if (!event.isAltPressed()) { + handled = arrowScrollVertically(View.FOCUS_UP); + } else { + handled = fullScrollVertically(View.FOCUS_UP); + } + } + break; + case KeyEvent.KEYCODE_DPAD_DOWN: + if (canScrollVertically()) { + if (!event.isAltPressed()) { + handled = arrowScrollVertically(View.FOCUS_DOWN); + } else { + handled = fullScrollVertically(View.FOCUS_DOWN); + } + } + break; + case KeyEvent.KEYCODE_DPAD_LEFT: + if (canScrollHorizontally()) { + if (!event.isAltPressed()) { + handled = arrowScrollHorizontally(View.FOCUS_LEFT); + } else { + handled = fullScrollHorizontally(View.FOCUS_LEFT); + } + } + break; + case KeyEvent.KEYCODE_DPAD_RIGHT: + if (canScrollHorizontally()) { + if (!event.isAltPressed()) { + handled = arrowScrollHorizontally(View.FOCUS_DOWN); + } else { + handled = fullScrollHorizontally(View.FOCUS_DOWN); + } + } + break; + case KeyEvent.KEYCODE_SPACE: + if (canScrollHorizontally()) { + pageScrollHorizontally(event.isShiftPressed() ? View.FOCUS_UP : View.FOCUS_DOWN); + } else if (canScrollVertically()) { + pageScrollVertically(event.isShiftPressed() ? View.FOCUS_UP : View.FOCUS_DOWN); + } + break; + } + } + + return handled; + } + + private boolean inChild(int x, int y) { + if (getChildCount() > 0) { + final int scrollY = getScrollY(); + final View child = getChildAt(0); + return !(y < child.getTop() - scrollY + || y >= child.getBottom() - scrollY + || x < child.getLeft() + || x >= child.getRight()); + } + return false; + } + + private void initOrResetVelocityTracker() { + if (mVelocityTracker == null) { + mVelocityTracker = VelocityTracker.obtain(); + } else { + mVelocityTracker.clear(); + } + } + + private void initVelocityTrackerIfNotExists() { + if (mVelocityTracker == null) { + mVelocityTracker = VelocityTracker.obtain(); + } + } + + private void recycleVelocityTracker() { + if (mVelocityTracker != null) { + mVelocityTracker.recycle(); + mVelocityTracker = null; + } + } + + @Override + public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) { + if (disallowIntercept) { + recycleVelocityTracker(); + } + super.requestDisallowInterceptTouchEvent(disallowIntercept); + } + + private void setScrollState(int state) { + if (state == mScrollState) { + return; + } + if (DEBUG) { + Log.d(TAG, "setting scroll state to " + state + " from " + mScrollState, + new Exception()); + } + mScrollState = state; + if (state != SCROLL_STATE_SETTLING) { +// stopScrollersInternal(); + } +// dispatchOnScrollStateChanged(state); + } + + private void cancelTouch() { + resetTouch(); + setScrollState(SCROLL_STATE_IDLE); + } + + private void resetTouch() { + recycleVelocityTracker(); + stopNestedScroll(); + releaseGlows(); + } + + private void releaseGlows() { + boolean needsInvalidate = false; + if (mEdgeGlowLeft != null) needsInvalidate = mEdgeGlowLeft.onRelease(); + if (mEdgeGlowTop != null) needsInvalidate |= mEdgeGlowTop.onRelease(); + if (mEdgeGlowRight != null) needsInvalidate |= mEdgeGlowRight.onRelease(); + if (mEdgeGlowBottom != null) needsInvalidate |= mEdgeGlowBottom.onRelease(); + if (needsInvalidate) { + ViewCompat.postInvalidateOnAnimation(this); + } + } + + @Override + public boolean onInterceptTouchEvent(MotionEvent ev) { + /* + * This method JUST determines whether we want to intercept the motion. + * If we return true, onMotionEvent will be called and we do the actual + * scrolling there. + */ + + /* + * Shortcut the most recurring case: the user is in the dragging + * state and he is moving his finger. We want to intercept this + * motion. + */ + + + final int action = ev.getAction(); +// if ((action == MotionEvent.ACTION_MOVE) && (mIsBeingDragged)) { +// return true; +// } + + if (action == MotionEvent.ACTION_MOVE && mScrollState == SCROLL_STATE_DRAGGING) { + return true; + } + + setScrollState(SCROLL_STATE_IDLE); + + final boolean canScrollHorizontally = canScrollHorizontally(); + final boolean canScrollVertically = canScrollVertically(); + + switch (action & MotionEventCompat.ACTION_MASK) { + case MotionEvent.ACTION_MOVE: { + /* + * mIsBeingDragged == false, otherwise the shortcut would have caught it. Check + * whether the user has moved far enough from his original down touch. + */ + + /* + * Locally do absolute value. mLastMotionY is set to the y value + * of the down event. + */ + final int activePointerId = mActivePointerId; + if (activePointerId == INVALID_POINTER) { + // If we don't have a valid id, the touch down wasn't on content. + break; + } + + final int pointerIndex = MotionEventCompat.findPointerIndex(ev, activePointerId); + if (pointerIndex == -1) { + Log.e(TAG, "Invalid pointerId=" + activePointerId + + " in onInterceptTouchEvent"); + break; + } + + final int y = (int) MotionEventCompat.getY(ev, pointerIndex); + final int x = (int) MotionEventCompat.getX(ev, pointerIndex); + if (mScrollState != SCROLL_STATE_DRAGGING) { + final int dx = x - mInitialTouchX; + final int dy = y - mInitialTouchY; + boolean startScroll = false; + if (canScrollHorizontally && Math.abs(dx) > mTouchSlop) { + mLastMotionX = mInitialTouchX + mTouchSlop * (dx < 0 ? -1 : 1); + startScroll = true; + } + if (canScrollVertically && Math.abs(dy) > mTouchSlop) { + mLastMotionY = mInitialTouchY + mTouchSlop * (dy < 0 ? -1 : 1); + startScroll = true; + } + initVelocityTrackerIfNotExists(); + mVelocityTracker.addMovement(ev); + mNestedYOffset = 0; + if (startScroll) { +// mIsBeingDragged = true; + setScrollState(SCROLL_STATE_DRAGGING); + } + } + break; + } + + case MotionEvent.ACTION_DOWN: { + final int y = (int) ev.getY(); + final int x = (int) ev.getX(); + if (!inChild(x, y)) { + setScrollState(SCROLL_STATE_IDLE); + recycleVelocityTracker(); + break; + } + + + /* + * Remember location of down touch. + * ACTION_DOWN always refers to pointer index 0. + */ + mLastMotionY = y; + mLastMotionX = x; + mInitialTouchY = mLastMotionY; + mInitialTouchX = mLastMotionX; + + mActivePointerId = MotionEventCompat.getPointerId(ev, 0); + + initOrResetVelocityTracker(); + mVelocityTracker.addMovement(ev); + /* + * If being flinged and user touches the screen, initiate drag; + * otherwise don't. mScroller.isFinished should be false when + * being flinged. We need to call computeScrollOffset() first so that + * isFinished() is correct. + */ + mScroller.computeScrollOffset(); +// mIsBeingDragged = !mScroller.isFinished(); + + if (mScrollState == SCROLL_STATE_SETTLING) { + getParent().requestDisallowInterceptTouchEvent(true); + setScrollState(SCROLL_STATE_DRAGGING); + } + int nestedScrollAxis = ViewCompat.SCROLL_AXIS_NONE; + if (canScrollHorizontally) { + nestedScrollAxis |= ViewCompat.SCROLL_AXIS_HORIZONTAL; + } + if (canScrollVertically) { + nestedScrollAxis |= ViewCompat.SCROLL_AXIS_VERTICAL; + } + startNestedScroll(nestedScrollAxis); + break; + } + + case MotionEvent.ACTION_CANCEL: +// mIsBeingDragged = false; + cancelTouch(); + break; + case MotionEvent.ACTION_UP: + /* Release the drag */ +// mIsBeingDragged = false; +// mActivePointerId = INVALID_POINTER; + recycleVelocityTracker(); +// if (mScroller.springBack(getScrollX(), getScrollY(), 0, getScrollRangeX(), 0, getScrollRangeY())) { +// ViewCompat.postInvalidateOnAnimation(this); +// } + stopNestedScroll(); + break; + case MotionEventCompat.ACTION_POINTER_UP: + onSecondaryPointerUp(ev); + break; + } + + /* + * The only time we want to intercept motion events is if we are in the + * drag mode. + */ + return false; + } + + @Override + public boolean onTouchEvent(MotionEvent ev) { + + initVelocityTrackerIfNotExists(); + + MotionEvent vtev = MotionEvent.obtain(ev); + + final boolean canScrollHorizontally = canScrollHorizontally(); + final boolean canScrollVertically = canScrollVertically(); + + final int actionMasked = MotionEventCompat.getActionMasked(ev); + + if (actionMasked == MotionEvent.ACTION_DOWN) { + mNestedYOffset = 0; + mNestedXOffset = 0; + } + vtev.offsetLocation(mNestedXOffset, mNestedYOffset); + + switch (actionMasked) { + case MotionEvent.ACTION_DOWN: { + + /* + * If being flinged and user touches, stop the fling. isFinished + * will be false if being flinged. + */ + if (!mScroller.isFinished()) { + mScroller.abortAnimation(); + } + + // Remember where the motion event started + mInitialTouchX = mLastMotionY = (int) ev.getY(); + mInitialTouchY = mLastMotionX = (int) ev.getX(); + mActivePointerId = MotionEventCompat.getPointerId(ev, 0); + + int nestedScrollAxis = ViewCompat.SCROLL_AXIS_NONE; + if (canScrollHorizontally) { + nestedScrollAxis |= ViewCompat.SCROLL_AXIS_HORIZONTAL; + } + if (canScrollVertically) { + nestedScrollAxis |= ViewCompat.SCROLL_AXIS_VERTICAL; + } + startNestedScroll(nestedScrollAxis); + break; + } + case MotionEvent.ACTION_MOVE: + final int activePointerIndex = MotionEventCompat.findPointerIndex(ev, + mActivePointerId); + if (activePointerIndex == -1) { + Log.e(TAG, "Invalid pointerId=" + mActivePointerId + " in onTouchEvent"); + return false; + } + + final int y = (int) MotionEventCompat.getY(ev, activePointerIndex); + final int x = (int) MotionEventCompat.getX(ev, activePointerIndex); + int dy = mLastMotionY - y; + int dx = mLastMotionX - x; + if (dispatchNestedPreScroll(dx, dy, mScrollConsumed, mScrollOffset)) { + dy -= mScrollConsumed[1]; + dx -= mScrollConsumed[0]; + vtev.offsetLocation(mScrollOffset[0], mScrollOffset[1]); + mNestedYOffset += mScrollOffset[1]; + mNestedXOffset += mScrollOffset[0]; + } + + if (mScrollState != SCROLL_STATE_DRAGGING) { + boolean startScroll = false; + if (canScrollHorizontally && Math.abs(dx) > mTouchSlop) { + if (dx > 0) { + dx -= mTouchSlop; + } else { + dx += mTouchSlop; + } + startScroll = true; + } + if (canScrollVertically && Math.abs(dy) > mTouchSlop) { + if (dy > 0) { + dy -= mTouchSlop; + } else { + dy += mTouchSlop; + } + startScroll = true; + } + if (startScroll) { + setScrollState(SCROLL_STATE_DRAGGING); + } + } + + if (mScrollState == SCROLL_STATE_DRAGGING) { + // Scroll to follow the motion event + mLastMotionY = y - mScrollOffset[1]; + mLastMotionX = x - mScrollOffset[0]; + + final int oldY = getScrollY(); + final int oldX = getScrollX(); + final int rangeY = getScrollRangeY(); + final int rangeX = getScrollRangeX(); + final int overscrollMode = ViewCompat.getOverScrollMode(this); + boolean canOverscrollY = overscrollMode == ViewCompat.OVER_SCROLL_ALWAYS || + (overscrollMode == ViewCompat.OVER_SCROLL_IF_CONTENT_SCROLLS && + rangeY > 0); + boolean canOverscrollX = overscrollMode == ViewCompat.OVER_SCROLL_ALWAYS || + (overscrollMode == ViewCompat.OVER_SCROLL_IF_CONTENT_SCROLLS && + rangeX > 0); + boolean canOverscroll = (canOverscrollY && canScrollVertically()) || (canOverscrollX && canScrollHorizontally()); + +// final ViewParent parent = getParent(); +// if (parent != null) { +// parent.requestDisallowInterceptTouchEvent(true); +// } + + // Calling overScrollByCompat will call onOverScrolled, which + // calls onScrollChanged if applicable. + if (overScrollByCompat(dx, dy, getScrollX(), getScrollY(), rangeX, rangeY, 0, 0, true)) { + // Break our velocity if we hit a scroll barrier. +// mVelocityTracker.clear(); + if (mChildHelper.hasNestedScrollingParent()) { + getParent().requestDisallowInterceptTouchEvent(true); + } + } + + final int scrolledDeltaY = getScrollY() - oldY; + final int scrolledDeltaX = getScrollX() - oldX; + final int unconsumedY = dy - scrolledDeltaY; + final int unconsumedX = dx - scrolledDeltaX; + if (dispatchNestedScroll(scrolledDeltaX, scrolledDeltaY, unconsumedX, unconsumedY, mScrollOffset)) { + mLastMotionY -= mScrollOffset[1]; + mLastMotionX -= mScrollOffset[0]; + vtev.offsetLocation(mScrollOffset[0], mScrollOffset[1]); + mNestedYOffset += mScrollOffset[1]; + mNestedXOffset += mScrollOffset[0]; + } else if (canOverscroll) { + ensureGlows(); + final int pulledToY = oldY + dy; + final int pulledToX = oldX + dx; + if (canScrollVertically()) { + if (pulledToY < 0) { + mEdgeGlowTop.onPull((float) dy / getHeight(), MotionEventCompat.getX(ev, activePointerIndex) / getWidth()); + if (!mEdgeGlowBottom.isFinished()) { + mEdgeGlowBottom.onRelease(); + } + } else if (pulledToY > rangeY) { + mEdgeGlowBottom.onPull((float) dy / getHeight(), 1.f - MotionEventCompat.getX(ev, activePointerIndex) / getWidth()); + if (!mEdgeGlowTop.isFinished()) { + mEdgeGlowTop.onRelease(); + } + } + } + if (canScrollHorizontally()) { + if (pulledToX < 0) { + mEdgeGlowLeft.onPull((float) dx / getWidth(), MotionEventCompat.getX(ev, activePointerIndex) / getHeight()); + if (!mEdgeGlowLeft.isFinished()) { + mEdgeGlowLeft.onRelease(); + } + } else if (pulledToX > rangeX) { + mEdgeGlowRight.onPull((float) dx / getWidth(), 1.f - MotionEventCompat.getX(ev, activePointerIndex) / getHeight()); + if (!mEdgeGlowRight.isFinished()) { + mEdgeGlowRight.onRelease(); + } + } + } + if (mEdgeGlowTop != null && (!mEdgeGlowTop.isFinished() || !mEdgeGlowBottom.isFinished() || !mEdgeGlowLeft.isFinished() || !mEdgeGlowRight.isFinished())) { + ViewCompat.postInvalidateOnAnimation(this); + } + } + } + break; + case MotionEvent.ACTION_UP: + final VelocityTracker velocityTracker = mVelocityTracker; + velocityTracker.computeCurrentVelocity(1000, mMaximumVelocity); + + final float xvel = canScrollHorizontally ? + -VelocityTrackerCompat.getXVelocity(mVelocityTracker, mActivePointerId) : 0; + final float yvel = canScrollVertically ? + -VelocityTrackerCompat.getYVelocity(mVelocityTracker, mActivePointerId) : 0; + + if (fling((int) xvel, (int) yvel)) { + setScrollState(SCROLL_STATE_IDLE); + } else if (mScroller.springBack(getScrollX(), getScrollY(), 0, getScrollRangeX(), 0, getScrollRangeY())) { + ViewCompat.postInvalidateOnAnimation(this); + } + mActivePointerId = INVALID_POINTER; + resetTouch(); + break; + case MotionEvent.ACTION_CANCEL: + if (mScrollState == SCROLL_STATE_DRAGGING) { + if (mScroller.springBack(getScrollX(), getScrollY(), 0, getScrollRangeX(), 0, getScrollRangeY())) { + ViewCompat.postInvalidateOnAnimation(this); + } + } + mActivePointerId = INVALID_POINTER; + cancelTouch(); + break; + case MotionEventCompat.ACTION_POINTER_DOWN: { + final int index = MotionEventCompat.getActionIndex(ev); + mInitialTouchX = mLastMotionY = (int) MotionEventCompat.getY(ev, index); + mInitialTouchX = mLastMotionX = (int) MotionEventCompat.getX(ev, index); + mActivePointerId = MotionEventCompat.getPointerId(ev, index); + break; + } + case MotionEventCompat.ACTION_POINTER_UP: + onSecondaryPointerUp(ev); + break; + } + + if (mVelocityTracker != null) { + mVelocityTracker.addMovement(vtev); + } + vtev.recycle(); + return true; + } + + private void onSecondaryPointerUp(MotionEvent ev) { + final int pointerIndex = (ev.getAction() & MotionEventCompat.ACTION_POINTER_INDEX_MASK) >> + MotionEventCompat.ACTION_POINTER_INDEX_SHIFT; + final int pointerId = MotionEventCompat.getPointerId(ev, pointerIndex); + if (pointerId == mActivePointerId) { + // This was our active pointer going up. Choose a new + // active pointer and adjust accordingly. + // TODO: Make this decision more intelligent. + final int newPointerIndex = pointerIndex == 0 ? 1 : 0; + mInitialTouchX = mLastMotionY = (int) MotionEventCompat.getY(ev, newPointerIndex); + mInitialTouchY = mLastMotionX = (int) MotionEventCompat.getX(ev, newPointerIndex); + mActivePointerId = MotionEventCompat.getPointerId(ev, newPointerIndex); + if (mVelocityTracker != null) { + mVelocityTracker.clear(); + } + } + } + + public boolean onGenericMotionEvent(MotionEvent event) { + if ((MotionEventCompat.getSource(event) & InputDeviceCompat.SOURCE_CLASS_POINTER) != 0) { + switch (event.getAction()) { + case MotionEventCompat.ACTION_SCROLL: { + final float vscroll = MotionEventCompat.getAxisValue(event, MotionEventCompat.AXIS_VSCROLL); + final float hscroll = MotionEventCompat.getAxisValue(event, MotionEventCompat.AXIS_HSCROLL); + if (vscroll != 0) { + int newScrollY = getScrollY(), oldScrollY = newScrollY; + int newScrollX = getScrollX(), oldScrollX = newScrollX; + if (canScrollHorizontally()) { + final int rangeX = getScrollRangeX(); + final int deltaX = (int) (hscroll * getHorizontalScrollFactorCompat()); + newScrollX = oldScrollX - deltaX; + if (newScrollX < 0) { + newScrollX = 0; + } else if (newScrollX > rangeX) { + newScrollX = rangeX; + } + } + if (canScrollVertically()) { + final int deltaY = (int) (vscroll * getVerticalScrollFactorCompat()); + final int rangeY = getScrollRangeY(); + newScrollY = oldScrollY - deltaY; + if (newScrollY < 0) { + newScrollY = 0; + } else if (newScrollY > rangeY) { + newScrollY = rangeY; + } + } + if (newScrollY != oldScrollY || newScrollX != oldScrollX) { + super.scrollTo(newScrollX, newScrollY); + return true; + } + } + } + } + } + return false; + } + + private float getVerticalScrollFactorCompat() { + if (mVerticalScrollFactor == 0) { + TypedValue outValue = new TypedValue(); + final Context context = getContext(); + if (!context.getTheme().resolveAttribute( + android.R.attr.listPreferredItemHeight, outValue, true)) { + throw new IllegalStateException( + "Expected theme to define listPreferredItemHeight."); + } + mVerticalScrollFactor = outValue.getDimension( + context.getResources().getDisplayMetrics()); + } + return mVerticalScrollFactor; + } + + private float getHorizontalScrollFactorCompat() { + if (mVerticalScrollFactor == 0) { + TypedValue outValue = new TypedValue(); + final Context context = getContext(); + if (!context.getTheme().resolveAttribute( + android.R.attr.listPreferredItemHeight, outValue, true)) { + throw new IllegalStateException( + "Expected theme to define listPreferredItemHeight."); + } + mVerticalScrollFactor = outValue.getDimension( + context.getResources().getDisplayMetrics()); + } + return mVerticalScrollFactor; + } + + protected void onOverScrolled(int scrollX, int scrollY, + boolean clampedX, boolean clampedY) { + super.scrollTo(scrollX, scrollY); + } + + boolean overScrollByCompat(int deltaX, int deltaY, + int scrollX, int scrollY, + int scrollRangeX, int scrollRangeY, + int maxOverScrollX, int maxOverScrollY, + boolean isTouchEvent) { + int oldScrollX = getScrollX(); + int oldScrollY = getScrollY(); + + final int overScrollMode = ViewCompat.getOverScrollMode(this); + final boolean canScrollHorizontal = + computeHorizontalScrollRange() > computeHorizontalScrollExtent() && canScrollHorizontally(); + final boolean canScrollVertical = + computeVerticalScrollRange() > computeVerticalScrollExtent() && canScrollVertically(); + final boolean overScrollHorizontal = overScrollMode == ViewCompat.OVER_SCROLL_ALWAYS || + (overScrollMode == ViewCompat.OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollHorizontal); + final boolean overScrollVertical = overScrollMode == ViewCompat.OVER_SCROLL_ALWAYS || + (overScrollMode == ViewCompat.OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollVertical); + + int newScrollX = scrollX; + if (canScrollHorizontally()) { + newScrollX += deltaX; + } + + int newScrollY = scrollY; + if (canScrollVertically()) { + newScrollY += deltaY; + } + + // Clamp values if at the limits and record + final int left = -maxOverScrollX; + final int right = maxOverScrollX + scrollRangeX; + final int top = -maxOverScrollY; + final int bottom = maxOverScrollY + scrollRangeY; + + boolean clampedX = false; + if (newScrollX > right) { + newScrollX = right; + clampedX = true; + } else if (newScrollX < left) { + newScrollX = left; + clampedX = true; + } + + boolean clampedY = false; + if (newScrollY > bottom) { + newScrollY = bottom; + clampedY = true; + } else if (newScrollY < top) { + newScrollY = top; + clampedY = true; + } + + if (clampedY && clampedX) { + mScroller.springBack(newScrollX, newScrollY, 0, getScrollRangeX(), 0, getScrollRangeY()); + } + + onOverScrolled(newScrollX, newScrollY, clampedX, clampedY); + + return getScrollX() - oldScrollX == deltaX || getScrollY() - oldScrollY == deltaY; + } + + private int getScrollRangeY() { + int scrollRange = 0; + if (getChildCount() > 0) { + View child = getChildAt(0); + scrollRange = Math.max(0, child.getHeight() - (getHeight() - getPaddingBottom() - getPaddingTop())); + } + return scrollRange; + } + + private int getScrollRangeX() { + int scrollRange = 0; + if (getChildCount() > 0) { + View child = getChildAt(0); + scrollRange = Math.max(0, child.getWidth() - (getWidth() - getPaddingLeft() - getPaddingRight())); + } + return scrollRange; + } + + /** + * Finds the next focusable component that fits in the specified bounds. + * + * @param topFocus look for a candidate is the one at the top of the bounds + * if topFocus is true, or at the bottom of the bounds if topFocus is + * false + * @param top the top offset of the bounds in which a focusable must be + * found + * @param bottom the bottom offset of the bounds in which a focusable must + * be found + * @return the next focusable component in the bounds or null if none can + * be found + */ + private View findFocusableViewInBoundsVertically(boolean topFocus, int top, int bottom) { + + List focusables = getFocusables(View.FOCUS_FORWARD); + View focusCandidate = null; + + /* + * A fully contained focusable is one where its top is below the bound's + * top, and its bottom is above the bound's bottom. A partially + * contained focusable is one where some part of it is within the + * bounds, but it also has some part that is not within bounds. A fully contained + * focusable is preferred to a partially contained focusable. + */ + boolean foundFullyContainedFocusable = false; + + int count = focusables.size(); + for (int i = 0; i < count; i++) { + View view = focusables.get(i); + int viewTop = view.getTop(); + int viewBottom = view.getBottom(); + + if (top < viewBottom && viewTop < bottom) { + /* + * the focusable is in the target area, it is a candidate for + * focusing + */ + + final boolean viewIsFullyContained = (top < viewTop) && + (viewBottom < bottom); + + if (focusCandidate == null) { + /* No candidate, take this one */ + focusCandidate = view; + foundFullyContainedFocusable = viewIsFullyContained; + } else { + final boolean viewIsCloserToBoundary = + (topFocus && viewTop < focusCandidate.getTop()) || + (!topFocus && viewBottom > focusCandidate + .getBottom()); + + if (foundFullyContainedFocusable) { + if (viewIsFullyContained && viewIsCloserToBoundary) { + /* + * We're dealing with only fully contained views, so + * it has to be closer to the boundary to beat our + * candidate + */ + focusCandidate = view; + } + } else { + if (viewIsFullyContained) { + /* Any fully contained view beats a partially contained view */ + focusCandidate = view; + foundFullyContainedFocusable = true; + } else if (viewIsCloserToBoundary) { + /* + * Partially contained view beats another partially + * contained view if it's closer + */ + focusCandidate = view; + } + } + } + } + } + + return focusCandidate; + } + + private View findFocusableViewInBoundsHorizontally(boolean topFocus, int left, int right) { + List focusables = getFocusables(View.FOCUS_FORWARD); + View focusCandidate = null; + + /* + * A fully contained focusable is one where its top is below the bound's + * top, and its bottom is above the bound's bottom. A partially + * contained focusable is one where some part of it is within the + * bounds, but it also has some part that is not within bounds. A fully contained + * focusable is preferred to a partially contained focusable. + */ + boolean foundFullyContainedFocusable = false; + + int count = focusables.size(); + for (int i = 0; i < count; i++) { + View view = focusables.get(i); + int viewLeft = view.getLeft(); + int viewRight = view.getRight(); + + if (left < viewRight && viewLeft < viewRight) { + /* + * the focusable is in the target area, it is a candidate for + * focusing + */ + + final boolean viewIsFullyContained = (left < viewLeft) && + (viewRight < right); + + if (focusCandidate == null) { + /* No candidate, take this one */ + focusCandidate = view; + foundFullyContainedFocusable = viewIsFullyContained; + } else { + final boolean viewIsCloserToBoundary = + (topFocus && viewLeft < focusCandidate.getTop()) || + (!topFocus && viewRight > focusCandidate + .getBottom()); + + if (foundFullyContainedFocusable) { + if (viewIsFullyContained && viewIsCloserToBoundary) { + /* + * We're dealing with only fully contained views, so + * it has to be closer to the boundary to beat our + * candidate + */ + focusCandidate = view; + } + } else { + if (viewIsFullyContained) { + /* Any fully contained view beats a partially contained view */ + focusCandidate = view; + foundFullyContainedFocusable = true; + } else if (viewIsCloserToBoundary) { + /* + * Partially contained view beats another partially + * contained view if it's closer + */ + focusCandidate = view; + } + } + } + } + } + + return focusCandidate; + } + + /** + * Handles scrolling in response to a "page up/down" shortcut press. This + * method will scroll the view by one page up or down and give the focus + * to the topmost/bottommost component in the new visible area. If no + * component is a good candidate for focus, this scrollview reclaims the + * focus. + * + * @param direction the scroll direction: {@link View#FOCUS_UP} + * to go one page up or + * {@link View#FOCUS_DOWN} to go one page down + * @return true if the key event is consumed by this method, false otherwise + */ + public boolean pageScrollHorizontally(int direction) { + boolean down = direction == View.FOCUS_DOWN; + int width = getWidth(); + + if (down) { + mTempRect.left = getScrollX() + width; + int count = getChildCount(); + if (count > 0) { + View view = getChildAt(count - 1); + if (mTempRect.left + width > view.getRight()) { + mTempRect.left = view.getRight() - width; + } + } + } else { + mTempRect.left = getScrollY() - width; + if (mTempRect.left < 0) { + mTempRect.left = 0; + } + } + mTempRect.right = mTempRect.left + width; + return scrollAndFocusHorizontally(direction, mTempRect.left, mTempRect.right); + } + + public boolean pageScrollVertically(int direction) { + boolean down = direction == View.FOCUS_DOWN; + int height = getHeight(); + + if (down) { + mTempRect.top = getScrollY() + height; + int count = getChildCount(); + if (count > 0) { + View view = getChildAt(count - 1); + if (mTempRect.top + height > view.getBottom()) { + mTempRect.top = view.getBottom() - height; + } + } + } else { + mTempRect.top = getScrollY() - height; + if (mTempRect.top < 0) { + mTempRect.top = 0; + } + } + mTempRect.bottom = mTempRect.top + height; + return scrollAndFocusVertically(direction, mTempRect.top, mTempRect.bottom); + } + + /** + * Handles scrolling in response to a "home/end" shortcut press. This + * method will scroll the view to the top or bottom and give the focus + * to the topmost/bottommost component in the new visible area. If no + * component is a good candidate for focus, this scrollview reclaims the + * focus. + * + * @param direction the scroll direction: {@link View#FOCUS_UP} + * to go the top of the view or + * {@link View#FOCUS_DOWN} to go the bottom + * @return true if the key event is consumed by this method, false otherwise + */ + public boolean fullScrollVertically(int direction) { + boolean down = direction == View.FOCUS_DOWN; + int height = getHeight(); + + mTempRect.top = 0; + mTempRect.bottom = height; + + if (down) { + int count = getChildCount(); + if (count > 0) { + View view = getChildAt(count - 1); + mTempRect.bottom = view.getBottom() + getPaddingBottom(); + mTempRect.top = mTempRect.bottom - height; + } + } + + return scrollAndFocusVertically(direction, mTempRect.top, mTempRect.bottom); + } + + /** + * Handles scrolling in response to a "home/end" shortcut press. This + * method will scroll the view to the top or bottom and give the focus + * to the topmost/bottommost component in the new visible area. If no + * component is a good candidate for focus, this scrollview reclaims the + * focus. + * + * @param direction the scroll direction: {@link View#FOCUS_UP} + * to go the top of the view or + * {@link View#FOCUS_DOWN} to go the bottom + * @return true if the key event is consumed by this method, false otherwise + */ + public boolean fullScrollHorizontally(int direction) { + boolean down = direction == View.FOCUS_RIGHT; + int width = getWidth(); + + mTempRect.left = 0; + mTempRect.right = width; + + if (down) { + int count = getChildCount(); + if (count > 0) { + View view = getChildAt(count - 1); + mTempRect.right = view.getRight() + getPaddingLeft(); + mTempRect.left = mTempRect.right - width; + } + } + + return scrollAndFocusHorizontally(direction, mTempRect.left, mTempRect.right); + } + + + private boolean scrollAndFocusHorizontally(int direction, int left, int right) { + boolean handled = true; + + int width = getWidth(); + int containerLeft = getScrollX(); + int containerRight = containerLeft + width; + boolean up = direction == View.FOCUS_LEFT; + + View newFocused = findFocusableViewInBoundsHorizontally(up, left, right); + if (newFocused == null) { + newFocused = this; + } + + if (left >= containerLeft && right <= containerRight) { + handled = false; + } else { + int delta = up ? (left - containerLeft) : (right - containerRight); + doScrollX(delta); + } + + if (newFocused != findFocus()) newFocused.requestFocus(direction); + + return handled; + } + + /** + * Scrolls the view to make the area defined by top and + * bottom visible. This method attempts to give the focus + * to a component visible in this area. If no component can be focused in + * the new visible area, the focus is reclaimed by this ScrollView. + * + * @param direction the scroll direction: {@link View#FOCUS_UP} + * to go upward, {@link View#FOCUS_DOWN} to downward + * @param top the top offset of the new area to be made visible + * @param bottom the bottom offset of the new area to be made visible + * @return true if the key event is consumed by this method, false otherwise + */ + private boolean scrollAndFocusVertically(int direction, int top, int bottom) { + boolean handled = true; + + int height = getHeight(); + int containerTop = getScrollY(); + int containerBottom = containerTop + height; + boolean up = direction == View.FOCUS_UP; + + View newFocused = findFocusableViewInBoundsVertically(up, top, bottom); + if (newFocused == null) { + newFocused = this; + } + + if (top >= containerTop && bottom <= containerBottom) { + handled = false; + } else { + int delta = up ? (top - containerTop) : (bottom - containerBottom); + doScrollY(delta); + } + + if (newFocused != findFocus()) newFocused.requestFocus(direction); + + return handled; + } + + /** + * Handle scrolling in response to an up or down arrow click. + * + * @param direction The direction corresponding to the arrow key that was + * pressed + * @return True if we consumed the event, false otherwise + */ + public boolean arrowScrollHorizontally(int direction) { + + View currentFocused = findFocus(); + if (currentFocused == this) currentFocused = null; + + View nextFocused = FocusFinder.getInstance().findNextFocus(this, currentFocused, direction); + + final int maxJump = getMaxScrollAmountX(); + + if (nextFocused != null && isWithinDeltaOfScreenX(nextFocused, maxJump, getWidth())) { + nextFocused.getDrawingRect(mTempRect); + offsetDescendantRectToMyCoords(nextFocused, mTempRect); + int[] scrollDelta = computeScrollDeltaToGetChildRectOnScreen(mTempRect); + doScrollX(scrollDelta[0]); + nextFocused.requestFocus(direction); + } else { + // no new focus + int scrollDelta = maxJump; + + if (direction == View.FOCUS_UP && getScrollX() < scrollDelta) { + scrollDelta = getScrollX(); + } else if (direction == View.FOCUS_DOWN) { + if (getChildCount() > 0) { + int daRight = getChildAt(0).getRight(); + int screenRight = getScrollX() + getWidth() - getPaddingRight(); + if (daRight - screenRight < maxJump) { + scrollDelta = daRight - screenRight; + } + } + } + if (scrollDelta == 0) { + return false; + } + doScrollX(direction == View.FOCUS_DOWN ? scrollDelta : -scrollDelta); + } + + if (currentFocused != null && currentFocused.isFocused() && isOffScreenX(currentFocused)) { + // previously focused item still has focus and is off screen, give + // it up (take it back to ourselves) + // (also, need to temporarily force FOCUS_BEFORE_DESCENDANTS so we are + // sure to + // get it) + final int descendantFocusability = getDescendantFocusability(); // save + setDescendantFocusability(ViewGroup.FOCUS_BEFORE_DESCENDANTS); + requestFocus(); + setDescendantFocusability(descendantFocusability); // restore + } + return true; + } + + /** + * Handle scrolling in response to an up or down arrow click. + * + * @param direction The direction corresponding to the arrow key that was + * pressed + * @return True if we consumed the event, false otherwise + */ + public boolean arrowScrollVertically(int direction) { + + View currentFocused = findFocus(); + if (currentFocused == this) currentFocused = null; + + View nextFocused = FocusFinder.getInstance().findNextFocus(this, currentFocused, direction); + + final int maxJump = getMaxScrollAmountY(); + + if (nextFocused != null && isWithinDeltaOfScreenY(nextFocused, maxJump, getHeight())) { + nextFocused.getDrawingRect(mTempRect); + offsetDescendantRectToMyCoords(nextFocused, mTempRect); + int[] scrollDelta = computeScrollDeltaToGetChildRectOnScreen(mTempRect); + doScrollY(scrollDelta[1]); + nextFocused.requestFocus(direction); + } else { + // no new focus + int scrollDelta = maxJump; + + if (direction == View.FOCUS_UP && getScrollY() < scrollDelta) { + scrollDelta = getScrollY(); + } else if (direction == View.FOCUS_DOWN) { + if (getChildCount() > 0) { + int daBottom = getChildAt(0).getBottom(); + int screenBottom = getScrollY() + getHeight() - getPaddingBottom(); + if (daBottom - screenBottom < maxJump) { + scrollDelta = daBottom - screenBottom; + } + } + } + if (scrollDelta == 0) { + return false; + } + doScrollY(direction == View.FOCUS_DOWN ? scrollDelta : -scrollDelta); + } + + if (currentFocused != null && currentFocused.isFocused() + && isOffScreenY(currentFocused)) { + // previously focused item still has focus and is off screen, give + // it up (take it back to ourselves) + // (also, need to temporarily force FOCUS_BEFORE_DESCENDANTS so we are + // sure to + // get it) + final int descendantFocusability = getDescendantFocusability(); // save + setDescendantFocusability(ViewGroup.FOCUS_BEFORE_DESCENDANTS); + requestFocus(); + setDescendantFocusability(descendantFocusability); // restore + } + return true; + } + + /** + * @return whether the descendant of this scroll view is scrolled off + * screen. + */ + private boolean isOffScreenX(View descendant) { + return !isWithinDeltaOfScreenX(descendant, 0, getWidth()); + } + + + /** + * @return whether the descendant of this scroll view is scrolled off + * screen. + */ + private boolean isOffScreenY(View descendant) { + return !isWithinDeltaOfScreenY(descendant, 0, getHeight()); + } + + /** + * @return whether the descendant of this scroll view is within delta + * pixels of being on the screen. + */ + private boolean isWithinDeltaOfScreenX(View descendant, int delta, int width) { + descendant.getDrawingRect(mTempRect); + offsetDescendantRectToMyCoords(descendant, mTempRect); + + return (mTempRect.right + delta) >= getScrollX() + && (mTempRect.left - delta) <= (getScrollX() + width); + } + + /** + * @return whether the descendant of this scroll view is within delta + * pixels of being on the screen. + */ + private boolean isWithinDeltaOfScreenY(View descendant, int delta, int height) { + descendant.getDrawingRect(mTempRect); + offsetDescendantRectToMyCoords(descendant, mTempRect); + + return (mTempRect.bottom + delta) >= getScrollY() + && (mTempRect.top - delta) <= (getScrollY() + height); + } + + private void doScrollXY(int[] delta) { + doScrollXY(delta[0], delta[1]); + } + + private void doScrollXY(int deltaX, int deltaY) { + if (deltaX != 0 || deltaY != 0) { + if (mSmoothScrollingEnabled) { + smoothScrollBy(deltaX, deltaY); + } else { + scrollBy(deltaX, deltaY); + } + } + } + + /** + * Smooth scroll by a Y delta + * + * @param delta the number of pixels to scroll by on the Y axis + */ + private void doScrollY(int delta) { + if (delta != 0) { + if (mSmoothScrollingEnabled) { + smoothScrollBy(0, delta); + } else { + scrollBy(0, delta); + } + } + } + + private void doScrollX(int delta) { + if (delta != 0) { + if (mSmoothScrollingEnabled) { + smoothScrollBy(delta, 0); + } else { + scrollBy(delta, 0); + } + } + } + + /** + * Like {@link View#scrollBy}, but scroll smoothly instead of immediately. + * + * @param dx the number of pixels to scroll by on the X axis + * @param dy the number of pixels to scroll by on the Y axis + */ + public final void smoothScrollBy(int dx, int dy) { + if (getChildCount() == 0) { + // Nothing to do. + return; + } + long duration = AnimationUtils.currentAnimationTimeMillis() - mLastScroll; + if (duration > ANIMATED_SCROLL_GAP) { + setScrollState(SCROLL_STATE_SETTLING); + + final int height = getHeight() - getPaddingBottom() - getPaddingTop(); + final int bottom = getChildAt(0).getHeight(); + final int width = getWidth() - getPaddingRight() - getPaddingLeft(); + final int right = getChildAt(0).getWidth(); + final int maxY = Math.max(0, bottom - height); + final int maxX = Math.max(0, right - width); + final int scrollY = getScrollY(); + final int scrollX = getScrollX(); + dy = Math.max(0, Math.min(scrollY + dy, maxY)) - scrollY; + dx = Math.max(0, Math.min(scrollX + dx, maxX)) - scrollX; + + mScroller.startScroll(scrollX, scrollY, dx, dy); + ViewCompat.postInvalidateOnAnimation(this); + } else { + setScrollState(SCROLL_STATE_IDLE); + if (!mScroller.isFinished()) { + mScroller.abortAnimation(); + } + scrollBy(dx, dy); + } + mLastScroll = AnimationUtils.currentAnimationTimeMillis(); + } + + /** + * Like {@link #scrollTo}, but scroll smoothly instead of immediately. + * + * @param x the position where to scroll on the X axis + * @param y the position where to scroll on the Y axis + */ + public final void smoothScrollTo(int x, int y) { + smoothScrollBy(x - getScrollX(), y - getScrollY()); + } + + + /** + * The scroll range of a scroll view is the overall height of all of its + * children. + */ + @Override + public int computeVerticalScrollRange() { + if (!canScrollVertically()) { + return super.computeVerticalScrollRange(); + } + final int count = getChildCount(); + final int contentHeight = getHeight() - getPaddingBottom() - getPaddingTop(); + if (count == 0) { + return contentHeight; + } + + int scrollRange = getChildAt(0).getBottom(); + final int scrollY = getScrollY(); + final int overscrollBottom = Math.max(0, scrollRange - contentHeight); + if (scrollY < 0) { + scrollRange -= scrollY; + } else if (scrollY > overscrollBottom) { + scrollRange += scrollY - overscrollBottom; + } + + return scrollRange; + } + + /** + * + */ + @Override + public int computeVerticalScrollOffset() { + return Math.max(0, super.computeVerticalScrollOffset()); + } + + /** + * + */ + @Override + public int computeVerticalScrollExtent() { + return super.computeVerticalScrollExtent(); + } + + /** + * + */ + @Override + public int computeHorizontalScrollRange() { + if (!canScrollHorizontally()) { + return super.computeHorizontalScrollRange(); + } + final int count = getChildCount(); + final int contentWidth = getWidth() - getPaddingRight() - getPaddingLeft(); + if (count == 0) { + return contentWidth; + } + + int scrollRange = getChildAt(0).getRight(); + final int scrollX = getScrollX(); + final int overscrollRight = Math.max(0, scrollRange - contentWidth); + if (scrollX < 0) { + scrollRange -= scrollX; + } else if (scrollX > overscrollRight) { + scrollRange += scrollX - overscrollRight; + } + return scrollRange; + } + + /** + * + */ + @Override + public int computeHorizontalScrollOffset() { + return Math.max(0, super.computeHorizontalScrollOffset()); + } + + /** + * + */ + @Override + public int computeHorizontalScrollExtent() { + return super.computeHorizontalScrollExtent(); + } + + @Override + protected void onLayout(boolean changed, int l, int t, int r, int b) { + if (getChildCount() == 0) { + return; + } + View child = getChildAt(0); + final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams(); + + int childLeft = getPaddingLeft() + lp.leftMargin; + int childTop = getPaddingTop() + lp.topMargin; + if (mChildLayoutCenter) { + if (getMeasuredWidth() > child.getMeasuredWidth()) { + childLeft = (getMeasuredWidth() - child.getMeasuredWidth()) / 2; + } + if (getMeasuredHeight() > child.getMeasuredHeight()) { + childTop = (getMeasuredHeight() - child.getMeasuredHeight()) / 2; + } + } + int measureHeight = child.getMeasuredHeight(); + int measuredWidth = child.getMeasuredWidth(); + child.layout(childLeft, childTop, measuredWidth + childLeft, childTop + measureHeight); + + + mIsLayoutDirty = false; + // Give a child focus if it needs it + if (mChildToScrollTo != null && isViewDescendantOf(mChildToScrollTo, this)) { + scrollToChild(mChildToScrollTo); + } + mChildToScrollTo = null; + + if (!mIsLaidOut) { + if (mSavedState != null) { + scrollTo(mSavedState.scrollXPosition, mSavedState.scrollYPosition); + mSavedState = null; + } // mScrollY default value is "0" + + final int childHeight = (getChildCount() > 0) ? getChildAt(0).getMeasuredHeight() : 0; + final int scrollRangeY = Math.max(0, + childHeight - (b - t - getPaddingBottom() - getPaddingTop())); + + final int childWidth = (getChildCount() > 0) ? getChildAt(0).getMeasuredWidth() : 0; + final int scrollRangeX = Math.max(0, + childWidth - (b - t - getPaddingRight() - getPaddingLeft())); + + int sY = getScrollY(); + int sX = getScrollX(); + + // Don't forget to clamp + if (getScrollY() > scrollRangeY) { + sY = scrollRangeY; + } else if (getScrollY() < 0) { + sY = 0; + } + if (getScrollX() > scrollRangeX) { + sX = scrollRangeX; + } else if (getScrollX() < 0) { + sX = 0; + } + if (sX != getScrollX() || sY != getScrollY()) { + scrollTo(sX, sY); + } + } + + // Calling this with the present values causes it to re-claim them + scrollTo(getScrollX(), getScrollY()); + mIsLaidOut = true; + } + + @Override + public MarginLayoutParams generateLayoutParams(AttributeSet attrs) { + return new MarginLayoutParams(getContext(), attrs); + } + + /** + * {@inheritDoc} + */ + @Override + protected boolean checkLayoutParams(LayoutParams p) { + return p instanceof MarginLayoutParams; + } + + @Override + protected MarginLayoutParams generateLayoutParams(LayoutParams p) { + return new MarginLayoutParams(p); + } + + @Override + protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { + if (getChildCount() == 0) { + return; + } + View child = getChildAt(0); + MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams(); + + int widthPadding = lp.leftMargin + lp.rightMargin + getPaddingLeft() + getPaddingRight(); + int heightPadding = lp.topMargin + lp.bottomMargin + getPaddingTop() + getPaddingBottom(); + int maxWidth = widthPadding; + int maxHeight = heightPadding; + maxHeight = Math.max(maxHeight, getSuggestedMinimumHeight()); + maxWidth = Math.max(maxWidth, getSuggestedMinimumWidth()); + + int childState = 0; + int childWidthMeasureSpec; + int childHeightMeasureSpec; + + if (canScrollVertically()) { + childHeightMeasureSpec = MeasureSpec.makeMeasureSpec( + MeasureSpec.getSize(heightMeasureSpec), MeasureSpec.UNSPECIFIED); + } else { + childHeightMeasureSpec = getChildMeasureSpec(heightMeasureSpec, + getPaddingBottom() + getPaddingTop() + lp.topMargin + lp.bottomMargin, lp.height); + } + if (canScrollHorizontally()) { + childWidthMeasureSpec = MeasureSpec.makeMeasureSpec( + MeasureSpec.getSize(widthMeasureSpec), MeasureSpec.UNSPECIFIED); + } else { + childWidthMeasureSpec = getChildMeasureSpec(widthMeasureSpec, + getPaddingLeft() + getPaddingRight() + lp.leftMargin + lp.rightMargin, lp.width); + } + child.measure(childWidthMeasureSpec, childHeightMeasureSpec); + + if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) { + childState = combineMeasuredStates(childState, child.getMeasuredState()); + } + maxWidth = Math.max(maxWidth, child.getMeasuredWidth() + lp.leftMargin + lp.rightMargin); + maxHeight = Math.max(maxHeight, child.getMeasuredHeight() + lp.topMargin + lp.bottomMargin); + + maxHeight = Math.max(maxHeight, getSuggestedMinimumHeight()); + maxWidth = Math.max(maxWidth, getSuggestedMinimumWidth()); + + int measuredWidth = ViewCompat.resolveSizeAndState(maxWidth, widthMeasureSpec, childState); + int measuredHeight = ViewCompat.resolveSizeAndState(maxHeight, heightMeasureSpec, childState << MEASURED_HEIGHT_STATE_SHIFT); + setMeasuredDimension(measuredWidth, measuredHeight); + + + boolean needMeasure = false; + final int heightMode = MeasureSpec.getMode(heightMeasureSpec); + if (heightMode != MeasureSpec.UNSPECIFIED && mFillViewportV) { + if (child.getMeasuredHeight() < measuredHeight - heightPadding) { + int newChildHeightMeasureSpec = MeasureSpec.makeMeasureSpec(measuredHeight - heightPadding, MeasureSpec.EXACTLY); + if (newChildHeightMeasureSpec != childHeightMeasureSpec) { + childHeightMeasureSpec = newChildHeightMeasureSpec; + needMeasure = true; + } + } + } + final int widthMode = MeasureSpec.getMode(widthMeasureSpec); + if (widthMode != MeasureSpec.UNSPECIFIED && mFillViewportH) { + if (child.getMeasuredWidth() < measuredWidth - widthPadding) { + int newChildWidthMeasureSpec = MeasureSpec.makeMeasureSpec(measuredWidth - widthPadding, MeasureSpec.EXACTLY); + if (newChildWidthMeasureSpec != childWidthMeasureSpec) { + childWidthMeasureSpec = newChildWidthMeasureSpec; + needMeasure = true; + } + } + } + if (needMeasure) { + child.measure(childWidthMeasureSpec, childHeightMeasureSpec); + } + } + + @Override + public void computeScroll() { + if (mScroller.computeScrollOffset()) { + int oldX = getScrollX(); + int oldY = getScrollY(); + int x = mScroller.getCurrX(); + int y = mScroller.getCurrY(); + + if (oldX != x || oldY != y) { + final int rangeY = getScrollRangeY(); + final int rangeX = getScrollRangeX(); + final int overscrollMode = ViewCompat.getOverScrollMode(this); + final boolean canOverscrollY = overscrollMode == ViewCompat.OVER_SCROLL_ALWAYS || + (overscrollMode == ViewCompat.OVER_SCROLL_IF_CONTENT_SCROLLS && rangeY > 0); + final boolean canOverscrollX = overscrollMode == ViewCompat.OVER_SCROLL_ALWAYS || + (overscrollMode == ViewCompat.OVER_SCROLL_IF_CONTENT_SCROLLS && rangeX > 0); + boolean canOverscroll = canOverscrollY || canOverscrollX; + + overScrollByCompat(x - oldX, y - oldY, oldX, oldY, rangeX, rangeY, + 0, 0, false); + + if (canOverscroll) { + ensureGlows(); + if (y <= 0 && oldY > 0) { + mEdgeGlowTop.onAbsorb((int) mScroller.getCurrVelocity()); + } else if (y >= rangeY && oldY < rangeY) { + mEdgeGlowBottom.onAbsorb((int) mScroller.getCurrVelocity()); + } + + if (x <= 0 && oldX > 0) { + mEdgeGlowLeft.onAbsorb((int) mScroller.getCurrVelocity()); + } else if (x >= rangeX && oldX < rangeX) { + mEdgeGlowRight.onAbsorb((int) mScroller.getCurrVelocity()); + } + } + } + +// final boolean fullyConsumedVertical = canScrollVertically() +// && x == getScrollX(); +// final boolean fullyConsumedHorizontal = canScrollHorizontally() +// && x == getScrollY(); +// final boolean fullyConsumedAny = fullyConsumedHorizontal +// || fullyConsumedVertical; + + if (mScroller.isFinished()) { + setScrollState(SCROLL_STATE_IDLE); // setting state to idle will stop this. + } else { + ViewCompat.postInvalidateOnAnimation(this); + } + } + } + + /** + * Scrolls the view to the given child. + * + * @param child the View to scroll to + */ + private void scrollToChild(View child) { + child.getDrawingRect(mTempRect); + + /* Offset from child's local coordinates to ScrollView coordinates */ + offsetDescendantRectToMyCoords(child, mTempRect); + + int scrollDelta[] = computeScrollDeltaToGetChildRectOnScreen(mTempRect); + + if (scrollDelta[0] != 0 || scrollDelta[1] != 0) { + scrollBy(scrollDelta[0], scrollDelta[1]); + } + } + + /** + * If rect is off screen, scroll just enough to get it (or at least the + * first screen size chunk of it) on screen. + * + * @param rect The rectangle. + * @param immediate True to scroll immediately without animation + * @return true if scrolling was performed + */ + private boolean scrollToChildRect(Rect rect, boolean immediate) { + final int delta[] = computeScrollDeltaToGetChildRectOnScreen(rect); + final boolean scroll = delta[0] != 0 || delta[1] != 0; + if (scroll) { + if (immediate) { + scrollBy(delta[0], delta[1]); + } else { + smoothScrollBy(delta[0], delta[1]); + } + } + return scroll; + } + + /** + * Compute the amount to scroll in the Y direction in order to get + * a rectangle completely on the screen (or, if taller than the screen, + * at least the first screen size chunk of it). + * + * @param rect The rect. + * @return The scroll delta. + */ + protected int[] computeScrollDeltaToGetChildRectOnScreen(Rect rect) { + if (getChildCount() == 0) return new int[]{0, 0}; + + int height = getHeight(); + int width = getWidth(); + int screenTop = getScrollY(); + int screenBottom = screenTop + height; + int screenLeft = getScrollX(); + int screenRight = screenLeft + width; + + int fadingEdgeY = getVerticalFadingEdgeLength(); + int fadingEdgeX = getHorizontalFadingEdgeLength(); + + // leave room for top fading edge as long as rect isn't at very top + if (rect.top > 0) { + screenTop += fadingEdgeY; + } + if (rect.left > 0) { + screenLeft += fadingEdgeX; + } + + // leave room for bottom fading edge as long as rect isn't at very bottom + if (rect.bottom < getChildAt(0).getHeight()) { + screenBottom -= fadingEdgeY; + } + if (rect.right < getChildAt(0).getWidth()) { + screenRight -= fadingEdgeX; + } + + int scrollYDelta = 0; + int scrollXDelta = 0; + + if (rect.bottom > screenBottom && rect.top > screenTop) { + // need to move down to get it in view: move down just enough so + // that the entire rectangle is in view (or at least the first + // screen size chunk). + + if (rect.height() > height) { + // just enough to get screen size chunk on + scrollYDelta += (rect.top - screenTop); + } else { + // get entire rect at bottom of screen + scrollYDelta += (rect.bottom - screenBottom); + } + + // make sure we aren't scrolling beyond the end of our content + int bottom = getChildAt(0).getBottom(); + int distanceToBottom = bottom - screenBottom; + scrollYDelta = Math.min(scrollYDelta, distanceToBottom); + + } else if (rect.top < screenTop && rect.bottom < screenBottom) { + // need to move up to get it in view: move up just enough so that + // entire rectangle is in view (or at least the first screen + // size chunk of it). + + if (rect.height() > height) { + // screen size chunk + scrollYDelta -= (screenBottom - rect.bottom); + } else { + // entire rect at top + scrollYDelta -= (screenTop - rect.top); + } + + // make sure we aren't scrolling any further than the top our content + scrollYDelta = Math.max(scrollYDelta, -getScrollY()); + } + if (rect.right > screenRight && rect.left > screenLeft) { + // need to move down to get it in view: move down just enough so + // that the entire rectangle is in view (or at least the first + // screen size chunk). + + if (rect.width() > width) { + // just enough to get screen size chunk on + scrollXDelta += (rect.left - screenLeft); + } else { + // get entire rect at bottom of screen + scrollXDelta += (rect.right - screenRight); + } + + // make sure we aren't scrolling beyond the end of our content + int right = getChildAt(0).getRight(); + int distanceToRight = right - screenRight; + scrollXDelta = Math.min(scrollXDelta, distanceToRight); + + } else if (rect.left < screenLeft && rect.right < screenRight) { + // need to move up to get it in view: move up just enough so that + // entire rectangle is in view (or at least the first screen + // size chunk of it). + + if (rect.width() > width) { + // screen size chunk + scrollXDelta -= (screenRight - rect.right); + } else { + // entire rect at top + scrollXDelta -= (screenLeft - rect.left); + } + + // make sure we aren't scrolling any further than the top our content + scrollXDelta = Math.max(scrollXDelta, -getScrollX()); + } + return new int[]{scrollXDelta, scrollYDelta}; + } + + @Override + public void requestChildFocus(View child, View focused) { + if (!mIsLayoutDirty) { + scrollToChild(focused); + } else { + // The child may not be laid out yet, we can't compute the scroll yet + mChildToScrollTo = focused; + } + super.requestChildFocus(child, focused); + } + + + /** + * When looking for focus in children of a scroll view, need to be a little + * more careful not to give focus to something that is scrolled off screen. + *

+ * This is more expensive than the default {@link ViewGroup} + * implementation, otherwise this behavior might have been made the default. + */ + @Override + protected boolean onRequestFocusInDescendants(int direction, + Rect previouslyFocusedRect) { + + // convert from forward / backward notation to up / down / left / right + // (ugh). + if (direction == View.FOCUS_FORWARD) { + direction = View.FOCUS_DOWN; + } else if (direction == View.FOCUS_BACKWARD) { + direction = View.FOCUS_UP; + } + + final View nextFocus = previouslyFocusedRect == null ? + FocusFinder.getInstance().findNextFocus(this, null, direction) : + FocusFinder.getInstance().findNextFocusFromRect(this, + previouslyFocusedRect, direction); + + if (nextFocus == null) { + return false; + } + + if (canScrollHorizontally()) { + if (isOffScreenX(nextFocus)) { + return false; + } + } else if (canScrollVertically()) { + if (isOffScreenY(nextFocus)) { + return false; + } + } + + return nextFocus.requestFocus(direction, previouslyFocusedRect); + } + + @Override + public boolean requestChildRectangleOnScreen(View child, Rect rectangle, + boolean immediate) { + // offset into coordinate space of this scroll view + rectangle.offset(child.getLeft() - child.getScrollX(), + child.getTop() - child.getScrollY()); + + return scrollToChildRect(rectangle, immediate); + } + + @Override + public void requestLayout() { + mIsLayoutDirty = true; + super.requestLayout(); + } + + @Override + public void onAttachedToWindow() { + super.onAttachedToWindow(); + + mIsLaidOut = false; + } + + @Override + protected void onSizeChanged(int w, int h, int oldw, int oldh) { + super.onSizeChanged(w, h, oldw, oldh); + + View currentFocused = findFocus(); + if (null == currentFocused || this == currentFocused) + return; + + // If the currently-focused view was visible on the screen when the + // screen was at the old height, then scroll the screen to make that + // view visible with the new screen height. + if (isWithinDeltaOfScreenX(currentFocused, 0, oldw) || isWithinDeltaOfScreenY(currentFocused, 0, oldh)) { + currentFocused.getDrawingRect(mTempRect); + offsetDescendantRectToMyCoords(currentFocused, mTempRect); + int scrollDelta[] = computeScrollDeltaToGetChildRectOnScreen(mTempRect); + doScrollXY(scrollDelta); + } + } + + /** + * Return true if child is a descendant of parent, (or equal to the parent). + */ + private static boolean isViewDescendantOf(View child, View parent) { + if (child == parent) { + return true; + } + + final ViewParent theParent = child.getParent(); + return (theParent instanceof ViewGroup) && isViewDescendantOf((View) theParent, parent); + } + + private boolean fling(int velocityX, int velocityY) { + final boolean canScrollHorizontal = canScrollHorizontally(); + final boolean canScrollVertical = canScrollVertically(); + + if (!canScrollHorizontal || Math.abs(velocityX) < mMinimumVelocity) { + velocityX = 0; + } + if (!canScrollVertical || Math.abs(velocityY) < mMinimumVelocity) { + velocityY = 0; + } + if (velocityX == 0 && velocityY == 0) { + // If we don't have any velocity, return false + return false; + } + + if (!dispatchNestedPreFling(velocityX, velocityY)) { + final int scrollY = getScrollY(); + final int scrollX = getScrollX(); + final boolean canFlingY = (scrollY > 0 || velocityY > 0) && + (scrollY < getScrollRangeY() || velocityY < 0); + final boolean canFlingX = (scrollX > 0 || velocityX > 0) && + (scrollX < getScrollRangeX() || velocityX < 0); + boolean canFling = canFlingY || canFlingX; + dispatchNestedFling(velocityX, velocityY, canFling); + if (canFling) { + setScrollState(SCROLL_STATE_SETTLING); + + velocityX = Math.max(-mMaximumVelocity, Math.min(velocityX, mMaximumVelocity)); + velocityY = Math.max(-mMaximumVelocity, Math.min(velocityY, mMaximumVelocity)); + + int height = getHeight() - getPaddingBottom() - getPaddingTop(); + int width = getWidth() - getPaddingRight() - getPaddingLeft(); + int bottom = getChildAt(0).getHeight(); + int right = getChildAt(0).getWidth(); + mScroller.fling(getScrollX(), getScrollY(), velocityX, velocityY, 0, Math.max(0, right - width), 0, + Math.max(0, bottom - height), width / 2, height / 2); + +// ViewCompat.postInvalidateOnAnimation(this); + return true; + } + } + return false; + } + +// private void endDrag() { +// mIsBeingDragged = false; +// +// recycleVelocityTracker(); +// stopNestedScroll(); +// +// if (mEdgeGlowTop != null) { +// mEdgeGlowTop.onRelease(); +// mEdgeGlowBottom.onRelease(); +// mEdgeGlowLeft.onRelease(); +// mEdgeGlowRight.onRelease(); +// } +// } + + /** + * {@inheritDoc} + *

+ * This version also clamps the scrolling to the bounds of our child. + */ + @Override + public void scrollTo(int x, int y) { + // we rely on the fact the View.scrollBy calls scrollTo. + if (getChildCount() > 0) { + View child = getChildAt(0); + x = clamp(x, getWidth() - getPaddingRight() - getPaddingLeft(), child.getWidth()); + y = clamp(y, getHeight() - getPaddingBottom() - getPaddingTop(), child.getHeight()); + if (x != getScrollX() || y != getScrollY()) { + super.scrollTo(x, y); + } + } + } + + private void ensureGlows() { + if (ViewCompat.getOverScrollMode(this) != ViewCompat.OVER_SCROLL_NEVER) { + if (mEdgeGlowTop == null) { + Context context = getContext(); + mEdgeGlowTop = new EdgeEffectCompat(context); + mEdgeGlowBottom = new EdgeEffectCompat(context); + mEdgeGlowLeft = new EdgeEffectCompat(context); + mEdgeGlowRight = new EdgeEffectCompat(context); + } + } else { + mEdgeGlowTop = null; + mEdgeGlowBottom = null; + mEdgeGlowLeft = null; + mEdgeGlowRight = null; + } + } + + @Override + public void dispatchDraw(Canvas canvas) { + super.dispatchDraw(canvas); + if (mEdgeGlowTop != null) { + final int scrollX = getScrollX(); + final int scrollY = getScrollY(); + if (!mEdgeGlowTop.isFinished()) { + final int restoreCount = canvas.save(); + final int width = getWidth() - getPaddingLeft() - getPaddingRight(); + + canvas.translate(getPaddingLeft() + scrollX, Math.min(0, scrollY)); + mEdgeGlowTop.setSize(width, getHeight()); + if (mEdgeGlowTop.draw(canvas)) { + ViewCompat.postInvalidateOnAnimation(this); + } + canvas.restoreToCount(restoreCount); + } + if (!mEdgeGlowBottom.isFinished()) { + final int restoreCount = canvas.save(); + final int width = getWidth() - getPaddingLeft() - getPaddingRight(); + final int height = getHeight(); + + canvas.translate(-width + getPaddingLeft() + scrollX, + Math.max(getScrollRangeY(), scrollY) + height); + canvas.rotate(180, width, 0); + mEdgeGlowBottom.setSize(width, height); + if (mEdgeGlowBottom.draw(canvas)) { + ViewCompat.postInvalidateOnAnimation(this); + } + canvas.restoreToCount(restoreCount); + } + if (!mEdgeGlowLeft.isFinished()) { + + final int restoreCount = canvas.save(); + final int width = getWidth(); + final int height = getHeight() - getPaddingTop() - getPaddingBottom(); + + canvas.rotate(270); + + canvas.translate(-height + getPaddingTop() - scrollY, Math.min(0, scrollX)); +// canvas.rotate(90, 0, 0); + mEdgeGlowLeft.setSize(height, width); + if (mEdgeGlowLeft.draw(canvas)) { + ViewCompat.postInvalidateOnAnimation(this); + } + canvas.restoreToCount(restoreCount); + } + if (!mEdgeGlowRight.isFinished()) { + final int restoreCount = canvas.save(); + final int width = getWidth(); + final int height = getHeight() - getPaddingTop() - getPaddingBottom(); + + canvas.rotate(90); + canvas.translate(-getPaddingTop() + scrollY, + -(Math.max(getScrollRangeX(), scrollX) + width)); + mEdgeGlowRight.setSize(height, width); + if (mEdgeGlowRight.draw(canvas)) { + ViewCompat.postInvalidateOnAnimation(this); + } + canvas.restoreToCount(restoreCount); + } + } + } + + private static int clamp(int n, int my, int child) { + if (my >= child || n < 0) { + /* my >= child is this case: + * |--------------- me ---------------| + * |------ child ------| + * or + * |--------------- me ---------------| + * |------ child ------| + * or + * |--------------- me ---------------| + * |------ child ------| + * + * n < 0 is this case: + * |------ me ------| + * |-------- child --------| + * |-- mScrollX --| + */ + return 0; + } + if ((my + n) > child) { + /* this case: + * |------ me ------| + * |------ child ------| + * |-- mScrollX --| + */ + return child - my; + } + return n; + } + + @Override + protected void onRestoreInstanceState(Parcelable state) { + if (!(state instanceof SavedState)) { + super.onRestoreInstanceState(state); + return; + } + + SavedState ss = (SavedState) state; + super.onRestoreInstanceState(ss.getSuperState()); + mSavedState = ss; + requestLayout(); + } + + @Override + protected Parcelable onSaveInstanceState() { + Parcelable superState = super.onSaveInstanceState(); + SavedState ss = new SavedState(superState); + ss.scrollYPosition = getScrollY(); + ss.scrollXPosition = getScrollX(); + return ss; + } + + static class SavedState extends BaseSavedState { + public int scrollYPosition; + public int scrollXPosition; + + SavedState(Parcelable superState) { + super(superState); + } + + public SavedState(Parcel source) { + super(source); + scrollYPosition = source.readInt(); + scrollXPosition = source.readInt(); + } + + @Override + public void writeToParcel(Parcel dest, int flags) { + super.writeToParcel(dest, flags); + dest.writeInt(scrollYPosition); + dest.writeInt(scrollXPosition); + } + + @Override + public String toString() { + return "HorizontalScrollView.SavedState{" + + Integer.toHexString(System.identityHashCode(this)) + + " scrollXPosition=" + scrollXPosition + " scrollYPosition=" + scrollYPosition + "}"; + } + + public static final Creator CREATOR + = new Creator() { + public SavedState createFromParcel(Parcel in) { + return new SavedState(in); + } + + public SavedState[] newArray(int size) { + return new SavedState[size]; + } + }; + } + + static class AccessibilityDelegate extends AccessibilityDelegateCompat { + @Override + public boolean performAccessibilityAction(View host, int action, Bundle arguments) { + if (super.performAccessibilityAction(host, action, arguments)) { + return true; + } + final NewHVScrollView nsvHost = (NewHVScrollView) host; + if (!nsvHost.isEnabled()) { + return false; + } + switch (action) { + case AccessibilityNodeInfoCompat.ACTION_SCROLL_FORWARD: { + final int viewportHeight = nsvHost.getHeight() - nsvHost.getPaddingBottom() + - nsvHost.getPaddingTop(); + final int viewportWidth = nsvHost.getWidth() - nsvHost.getPaddingRight() + - nsvHost.getPaddingLeft(); + final int targetScrollY = Math.min(nsvHost.getScrollY() + viewportHeight, + nsvHost.getScrollRangeY()); + final int targetScrollX = Math.min(nsvHost.getScrollX() + viewportWidth, + nsvHost.getScrollRangeX()); + if (targetScrollY != nsvHost.getScrollY() || targetScrollX != nsvHost.getScrollX()) { + nsvHost.smoothScrollTo(targetScrollX, targetScrollY); + return true; + } + } + return false; + case AccessibilityNodeInfoCompat.ACTION_SCROLL_BACKWARD: { + final int viewportHeight = nsvHost.getHeight() - nsvHost.getPaddingBottom() + - nsvHost.getPaddingTop(); + final int viewportWidth = nsvHost.getWidth() - nsvHost.getPaddingRight() + - nsvHost.getPaddingLeft(); + final int targetScrollY = Math.max(nsvHost.getScrollY() - viewportHeight, 0); + final int targetScrollX = Math.min(nsvHost.getScrollX() - viewportWidth, 0); + if (targetScrollY != nsvHost.getScrollY() || targetScrollX != nsvHost.getScrollX()) { + nsvHost.smoothScrollTo(targetScrollX, targetScrollY); + return true; + } + } + return false; + } + return false; + } + + @Override + public void onInitializeAccessibilityNodeInfo(View host, AccessibilityNodeInfoCompat info) { + super.onInitializeAccessibilityNodeInfo(host, info); + final NewHVScrollView nsvHost = (NewHVScrollView) host; + info.setClassName(ScrollView.class.getName()); + if (nsvHost.isEnabled()) { + final int scrollRangeY = nsvHost.getScrollRangeY(); + final int scrollRangeX = nsvHost.getScrollRangeX(); + if (scrollRangeY > 0 || scrollRangeX > 0) { + info.setScrollable(true); + if (nsvHost.getScrollY() > 0 || nsvHost.getScrollX() > 0) { + info.addAction(AccessibilityNodeInfoCompat.ACTION_SCROLL_BACKWARD); + } + if (nsvHost.getScrollY() < scrollRangeY || nsvHost.getScrollX() < scrollRangeX) { + info.addAction(AccessibilityNodeInfoCompat.ACTION_SCROLL_FORWARD); + } + } + } + } + + @Override + public void onInitializeAccessibilityEvent(View host, AccessibilityEvent event) { + super.onInitializeAccessibilityEvent(host, event); + final NewHVScrollView nsvHost = (NewHVScrollView) host; + event.setClassName(ScrollView.class.getName()); + final AccessibilityRecordCompat record = AccessibilityEventCompat.asRecord(event); + final boolean scrollableX = nsvHost.getScrollRangeY() > 0; + final boolean scrollableY = nsvHost.getScrollRangeX() > 0; + boolean scrollable = scrollableX || scrollableY; + record.setScrollable(scrollable); + record.setScrollX(nsvHost.getScrollX()); + record.setScrollY(nsvHost.getScrollY()); + record.setMaxScrollX(nsvHost.getScrollRangeX()); + record.setMaxScrollY(nsvHost.getScrollRangeY()); + } + } + + + public void setFillViewportH(boolean fillViewportH) { + if (mFillViewportH != fillViewportH) { + this.mFillViewportH = fillViewportH; + requestLayout(); + } + } + + public void setFillViewportV(boolean fillViewportV) { + if (mFillViewportV != fillViewportV) { + this.mFillViewportV = fillViewportV; + requestLayout(); + } + } + + public void setFillViewportHV(boolean fillViewportH, boolean fillViewportV) { + if (mFillViewportH != fillViewportH || mFillViewportV != fillViewportV) { + this.mFillViewportH = fillViewportH; + this.mFillViewportV = fillViewportV; + requestLayout(); + } + } + + @Override + public boolean canScrollHorizontally(int direction) { + if (direction > 0) { + return getScrollX() < getScrollRangeX(); + } else { + return getScrollX() > 0 && getScrollRangeX() > 0; + } + } + + @Override + public boolean canScrollVertically(int direction) { + if (direction > 0) { + return getScrollY() < getScrollRangeY(); + } else { + return getScrollY() > 0 && getScrollRangeY() > 0; + } + } +} \ No newline at end of file