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Fix touch target computation

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Differential Revision: D2516811

fb-gh-sync-id: 1f3490f969912f1eb8f4d49a5daa976314bbc25f
This commit is contained in:
Andrei Coman
2015-10-07 01:45:12 -07:00
committed by facebook-github-bot-7
parent fb90ba6ded
commit c805157cac
3 changed files with 20 additions and 10 deletions
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24
ReactAndroid/src/main/java/com/facebook/react/uimanager/TouchTargetHelper.java
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@@ -79,17 +79,27 @@ public class TouchTargetHelper {
// parent, therefore `getGlobalVisibleRect` call will return bogus result as it treat view
// with no parent as a root of the view hierarchy. To prevent this from happening we check
// that view has a parent before visiting it.
if (child.getParent() != null && child.getGlobalVisibleRect(mVisibleRect)) {
if (eventX >= mVisibleRect.left && eventX <= mVisibleRect.right
&& eventY >= mVisibleRect.top && eventY <= mVisibleRect.bottom) {
View targetView = findTouchTargetViewWithPointerEvents(eventX, eventY, child);
if (targetView != null) {
return targetView;
}
if (child.getParent() != null && isTouchPointInView(eventX, eventY, viewGroup, child)) {
// Apply offset to event coordinates to transform them into the coordinate space of the
// child view, taken from {@link ViewGroup#dispatchTransformedTouchEvent()}.
eventX += viewGroup.getScrollX() - child.getLeft();
eventY += viewGroup.getScrollY() - child.getTop();
View targetView = findTouchTargetViewWithPointerEvents(eventX, eventY, child);
if (targetView != null) {
return targetView;
}
}
}
return viewGroup;
}
// Taken from {@link ViewGroup#isTransformedTouchPointInView()}
private static boolean isTouchPointInView(float x, float y, ViewGroup parent, View child) {
float localX = x + parent.getScrollX() - child.getLeft();
float localY = y + parent.getScrollY() - child.getTop();
// Taken from {@link View#pointInView()}.
return localX >= 0 && localX < (child.getRight() - child.getLeft())
&& localY >= 0 && localY < (child.getBottom() - child.getTop());
}
/**