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Android shouldn't dispatch onLayout if frame didn't change

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Summary:
Fixes [#7202 Android Redundant onLayout event](https://github.com/facebook/react-native/issues/7202)
Closes https://github.com/facebook/react-native/pull/7250

Differential Revision: D4104066

Pulled By: mkonicek

fbshipit-source-id: 383efdb4b4881aa7d7e508d61c9c01165bcf7bb6
This commit is contained in:
Howard Yeh 2016-10-31 10:51:37 -07:00 committed by Facebook Github Bot
parent 9833e1bd34
commit d4b8ae7a8a
2 changed files with 28 additions and 8 deletions
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28
ReactAndroid/src/main/java/com/facebook/react/uimanager/ReactShadowNode.java
View File

@ -237,7 +237,10 @@ public class ReactShadowNode extends CSSNodeDEPRECATED {
public void onCollectExtraUpdates(UIViewOperationQueue uiViewOperationQueue) {
}
/* package */ void dispatchUpdates(
/**
* @return true if layout (position or dimensions) changed, false otherwise.
*/
/* package */ boolean dispatchUpdates(
float absoluteX,
float absoluteY,
UIViewOperationQueue uiViewOperationQueue,
@ -247,12 +250,27 @@ public class ReactShadowNode extends CSSNodeDEPRECATED {
}
if (hasNewLayout()) {
mAbsoluteLeft = Math.round(absoluteX + getLayoutX());
mAbsoluteTop = Math.round(absoluteY + getLayoutY());
mAbsoluteRight = Math.round(absoluteX + getLayoutX() + getLayoutWidth());
mAbsoluteBottom = Math.round(absoluteY + getLayoutY() + getLayoutHeight());
float newLeft = Math.round(absoluteX + getLayoutX());
float newTop = Math.round(absoluteY + getLayoutY());
float newRight = Math.round(absoluteX + getLayoutX() + getLayoutWidth());
float newBottom = Math.round(absoluteY + getLayoutY() + getLayoutHeight());
if (newLeft == mAbsoluteLeft &&
newRight == mAbsoluteRight &&
newTop == mAbsoluteTop &&
newBottom == mAbsoluteBottom) {
return false;
}
mAbsoluteLeft = newLeft;
mAbsoluteTop = newTop;
mAbsoluteRight = newRight;
mAbsoluteBottom = newBottom;
nativeViewHierarchyOptimizer.handleUpdateLayout(this);
return true;
} else {
return false;
}
}

8
ReactAndroid/src/main/java/com/facebook/react/uimanager/UIImplementation.java
View File

@ -789,14 +789,16 @@ public class UIImplementation {
int tag = cssNode.getReactTag();
if (!mShadowNodeRegistry.isRootNode(tag)) {
cssNode.dispatchUpdates(
boolean frameDidChange = cssNode.dispatchUpdates(
absoluteX,
absoluteY,
mOperationsQueue,
mNativeViewHierarchyOptimizer);
// notify JS about layout event if requested
if (cssNode.shouldNotifyOnLayout()) {
// Notify JS about layout event if requested
// and if the position or dimensions actually changed
// (consistent with iOS).
if (frameDidChange && cssNode.shouldNotifyOnLayout()) {
mEventDispatcher.dispatchEvent(
OnLayoutEvent.obtain(
tag,