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https://github.com/zhigang1992/react-native.git
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e2cf37a5a6
Summary: This is to be able to depend on ReactClippingViewGroup from BaseViewManager. Devs using ReactClippingViewGroup may need to update their imports when updating past this commit. Reviewed By: lexs Differential Revision: D3835328 fbshipit-source-id: 290c08b130d837e553b68a90377bd9a30b7ec6dc
62 lines
2.2 KiB
Java
62 lines
2.2 KiB
Java
/**
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* Copyright (c) 2015-present, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*/
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package com.facebook.react.uimanager;
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import javax.annotation.concurrent.NotThreadSafe;
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import android.graphics.Rect;
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import android.view.View;
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import android.view.ViewParent;
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/**
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* Provides implementation of common tasks for view and it's view manager supporting property
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* {@code removeClippedSubviews}.
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*/
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@NotThreadSafe
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public class ReactClippingViewGroupHelper {
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public static final String PROP_REMOVE_CLIPPED_SUBVIEWS = "removeClippedSubviews";
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private static final Rect sHelperRect = new Rect();
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/**
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* Can be used by view that support {@code removeClippedSubviews} property to calculate area that
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* given {@param view} should be clipped to based on the clipping rectangle of it's parent in
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* case when parent is also set to clip it's children.
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*
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* @param view view that we want to calculate clipping rect for
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* @param outputRect where the calculated rectangle will be written
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*/
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public static void calculateClippingRect(View view, Rect outputRect) {
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ViewParent parent = view.getParent();
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if (parent == null) {
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outputRect.setEmpty();
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return;
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} else if (parent instanceof ReactClippingViewGroup) {
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ReactClippingViewGroup clippingViewGroup = (ReactClippingViewGroup) parent;
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if (clippingViewGroup.getRemoveClippedSubviews()) {
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clippingViewGroup.getClippingRect(sHelperRect);
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// Intersect the view with the parent's rectangle
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// This will result in the overlap with coordinates in the parent space
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if (!sHelperRect.intersect(view.getLeft(), view.getTop(), view.getRight(), view.getBottom())) {
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outputRect.setEmpty();
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return;
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}
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// Now we move the coordinates to the View's coordinate space
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sHelperRect.offset(-view.getLeft(), -view.getTop());
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sHelperRect.offset(view.getScrollX(), view.getScrollY());
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outputRect.set(sHelperRect);
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return;
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}
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}
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view.getDrawingRect(outputRect);
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}
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}
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