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Add NodeRegion to allow any FlatShadowNode to respond to touch events

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Summary: @public When Android dispatches `MotionEvent` to `ReactRootView`, it needs to find a correspoding react node that should receive it. To be able to do it, we need to store boundaries of every `FlatShadowNode` in `FlatViewGroup`. Then we can iterate over node boundaries and find one that contains the touch event coordinates.

Reviewed By: sriramramani

Differential Revision: D2694197
This commit is contained in:
Denis Koroskin
2015-12-13 18:26:10 -08:00
committed by Ahmed El-Helw
parent 8de2acd3a9
commit dad378e394
6 changed files with 118 additions and 8 deletions
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22
ReactAndroid/src/main/java/com/facebook/react/flat/FlatViewGroup.java
View File

@@ -19,11 +19,13 @@ import android.view.View;
import android.view.ViewGroup;
import android.view.ViewParent;
import com.facebook.react.uimanager.ReactCompoundView;
/**
* A view that FlatShadowNode hierarchy maps to. Performs drawing by iterating over
* array of DrawCommands, executing them one by one.
*/
/* package */ final class FlatViewGroup extends ViewGroup {
/* package */ final class FlatViewGroup extends ViewGroup implements ReactCompoundView {
/**
* Helper class that allows AttachDetachListener to invalidate the hosting View.
*/
@@ -47,6 +49,7 @@ import android.view.ViewParent;
private @Nullable InvalidateCallback mInvalidateCallback;
private DrawCommand[] mDrawCommands = DrawCommand.EMPTY_ARRAY;
private AttachDetachListener[] mAttachDetachListeners = AttachDetachListener.EMPTY_ARRAY;
private NodeRegion[] mNodeRegions = NodeRegion.EMPTY_ARRAY;
private int mDrawChildIndex = 0;
private boolean mIsAttached = false;
@@ -59,6 +62,19 @@ import android.view.ViewParent;
super.detachAllViewsFromParent();
}
@Override
public int reactTagForTouch(float touchX, float touchY) {
for (NodeRegion nodeRegion : mNodeRegions) {
if (nodeRegion.mLeft <= touchX && touchX < nodeRegion.mRight &&
nodeRegion.mTop <= touchY && touchY < nodeRegion.mBottom) {
return nodeRegion.mTag;
}
}
// no children found
return getId();
}
@Override
public void dispatchDraw(Canvas canvas) {
super.dispatchDraw(canvas);
@@ -143,6 +159,10 @@ import android.view.ViewParent;
mAttachDetachListeners = listeners;
}
/* package */ void mountNodeRegions(NodeRegion[] nodeRegions) {
mNodeRegions = nodeRegions;
}
/* package */ void mountViews(ViewResolver viewResolver, int[] viewsToAdd, int[] viewsToDetach) {
for (int viewToAdd : viewsToAdd) {
if (viewToAdd > 0) {