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Android: impl scroll to item with top offset api

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王劲鹏 2023-08-03 19:11:22 +08:00 committed by osborn
parent 3dd44cf9f7
commit 411ca694e4
1 changed files with 31 additions and 1 deletions
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30
doric-android/doric/src/main/java/pub/doric/shader/list/ListNode.java
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@ -44,6 +44,7 @@ import org.json.JSONArray;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Objects;
import java.util.Set;
import java.util.concurrent.Callable;
@ -472,8 +473,13 @@ public class ListNode extends SuperNode<RecyclerView> implements IDoricScrollabl
animated = params.getProperty("animated").asBoolean().value();
}
JSNumber pos = params.getProperty("index").asNumber();
JSValue topOffsetValue = params.getProperty("topOffset");
if (topOffsetValue.isNumber()) {
moveToPositionWithTopOffset(pos.toInt(), animated, topOffsetValue.asNumber().toFloat());
} else {
moveToPosition(pos.toInt(), animated);
}
}
@DoricMethod
public JSONArray findVisibleItems() {
@ -537,6 +543,11 @@ public class ListNode extends SuperNode<RecyclerView> implements IDoricScrollabl
}
}
private void moveToPositionWithTopOffset(int pos, boolean animated, float topOffset) {
RecyclerView.SmoothScroller smoothScroller = new OffsetLinearSmoothScroller(getContext(), DoricUtils.dp2px(-topOffset));
smoothScroller.setTargetPosition(pos);
Objects.requireNonNull(mView.getLayoutManager()).startSmoothScroll(smoothScroller);
}
private void defaultScrollTo(int pos, boolean b) {
if (b) {
@ -714,4 +725,23 @@ public class ListNode extends SuperNode<RecyclerView> implements IDoricScrollabl
return calculateDtToFit(top, bottom, start, end, snapPreference);
}
}
private static class OffsetLinearSmoothScroller extends LinearSmoothScroller {
private final int offset;
public OffsetLinearSmoothScroller(Context context, int offset) {
super(context);
this.offset = offset;
}
@Override
public int calculateDtToFit(int viewStart, int viewEnd, int boxStart, int boxEnd, int snapPreference) {
return boxStart - viewStart + offset;
}
@Override
protected int getVerticalSnapPreference() {
return LinearSmoothScroller.SNAP_TO_START;
}
}
}