From 7140190adfb4abbc64b9ceb5a91ea378fc299139 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?=E7=8E=8B=E5=8A=B2=E9=B9=8F?= Date: Wed, 15 Jan 2020 14:11:01 +0800 Subject: [PATCH] HVScrollView fling changed --- .../java/pub/doric/shader/ScrollerNode.java | 10 +- .../java/pub/doric/widget/HVScrollView.java | 11 +- .../pub/doric/widget/NewHVScrollView.java | 2719 ----------------- 3 files changed, 11 insertions(+), 2729 deletions(-) delete mode 100644 doric-android/doric/src/main/java/pub/doric/widget/NewHVScrollView.java 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 b7b1d236..18ccf135 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.NewHVScrollView; +import pub.doric.widget.HVScrollView; /** * @Description: pub.doric.shader @@ -29,7 +29,7 @@ import pub.doric.widget.NewHVScrollView; * @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 NewHVScrollView build() { - return new NewHVScrollView(getContext()); + protected HVScrollView build() { + return new HVScrollView(getContext()); } @Override - protected void blend(NewHVScrollView view, String name, JSValue prop) { + protected void blend(HVScrollView 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 82456d55..91322fa5 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 @@ -1960,11 +1960,12 @@ public class HVScrollView extends FrameLayout implements NestedScrollingParent, 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 + 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 / 3, height * 2 / 3); mLastScrollerX = getScrollX(); mLastScrollerY = getScrollY(); ViewCompat.postInvalidateOnAnimation(this); 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 deleted file mode 100644 index 3b0aa002..00000000 --- a/doric-android/doric/src/main/java/pub/doric/widget/NewHVScrollView.java +++ /dev/null @@ -1,2719 +0,0 @@ -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