/**
* Copyright (c) 2015-present, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under the BSD-style license found in the
* LICENSE file in the root directory of this source tree. An additional grant
* of patent rights can be found in the PATENTS file in the same directory.
*/
package com.facebook.react.views.view;
import javax.annotation.concurrent.NotThreadSafe;
import android.graphics.Rect;
import android.view.View;
import android.view.ViewParent;
import com.facebook.react.uimanager.CatalystStylesDiffMap;
/**
* Provides implementation of common tasks for view and it's view manager supporting property
* {@code removeClippedSubviews}.
*/
@NotThreadSafe
public class ReactClippingViewGroupHelper {
public static final String PROP_REMOVE_CLIPPED_SUBVIEWS = "removeClippedSubviews";
private static final Rect sHelperRect = new Rect();
/**
* Can be used by view that support {@code removeClippedSubviews} property to calculate area that
* given {@param view} should be clipped to based on the clipping rectangle of it's parent in
* case when parent is also set to clip it's children.
*
* @param view view that we want to calculate clipping rect for
* @param outputRect where the calculated rectangle will be written
*/
public static void calculateClippingRect(View view, Rect outputRect) {
ViewParent parent = view.getParent();
if (parent == null) {
outputRect.setEmpty();
return;
} else if (parent instanceof ReactClippingViewGroup) {
ReactClippingViewGroup clippingViewGroup = (ReactClippingViewGroup) parent;
if (clippingViewGroup.getRemoveClippedSubviews()) {
clippingViewGroup.getClippingRect(sHelperRect);
sHelperRect.offset(-view.getLeft(), -view.getTop());
view.getDrawingRect(outputRect);
if (!outputRect.intersect(sHelperRect)) {
// rectangles does not intersect -> we should write empty rect to output
outputRect.setEmpty();
}
return;
}
}
view.getDrawingRect(outputRect);
}
}