| /* |
| * Copyright (C) 2015 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package android.support.design.widget; |
| |
| import android.graphics.Rect; |
| import android.os.Build; |
| import android.view.View; |
| import android.view.ViewGroup; |
| |
| class ViewGroupUtils { |
| |
| private interface ViewGroupUtilsImpl { |
| void offsetDescendantRect(ViewGroup parent, View child, Rect rect); |
| } |
| |
| private static class ViewGroupUtilsImplBase implements ViewGroupUtilsImpl { |
| @Override |
| public void offsetDescendantRect(ViewGroup parent, View child, Rect rect) { |
| parent.offsetDescendantRectToMyCoords(child, rect); |
| // View#offsetDescendantRectToMyCoords includes scroll offsets of the last child. |
| // We need to reverse it here so that we get the rect of the view itself rather |
| // than its content. |
| rect.offset(child.getScrollX(), child.getScrollY()); |
| } |
| } |
| |
| private static class ViewGroupUtilsImplHoneycomb implements ViewGroupUtilsImpl { |
| @Override |
| public void offsetDescendantRect(ViewGroup parent, View child, Rect rect) { |
| ViewGroupUtilsHoneycomb.offsetDescendantRect(parent, child, rect); |
| } |
| } |
| |
| private static final ViewGroupUtilsImpl IMPL; |
| |
| static { |
| final int version = Build.VERSION.SDK_INT; |
| if (version >= 11) { |
| IMPL = new ViewGroupUtilsImplHoneycomb(); |
| } else { |
| IMPL = new ViewGroupUtilsImplBase(); |
| } |
| } |
| |
| /** |
| * This is a port of the common |
| * {@link ViewGroup#offsetDescendantRectToMyCoords(android.view.View, android.graphics.Rect)} |
| * from the framework, but adapted to take transformations into account. The result |
| * will be the bounding rect of the real transformed rect. |
| * |
| * @param descendant view defining the original coordinate system of rect |
| * @param rect (in/out) the rect to offset from descendant to this view's coordinate system |
| */ |
| static void offsetDescendantRect(ViewGroup parent, View descendant, Rect rect) { |
| IMPL.offsetDescendantRect(parent, descendant, rect); |
| } |
| |
| /** |
| * Retrieve the transformed bounding rect of an arbitrary descendant view. |
| * This does not need to be a direct child. |
| * |
| * @param descendant descendant view to reference |
| * @param out rect to set to the bounds of the descendant view |
| */ |
| static void getDescendantRect(ViewGroup parent, View descendant, Rect out) { |
| out.set(0, 0, descendant.getWidth(), descendant.getHeight()); |
| offsetDescendantRect(parent, descendant, out); |
| } |
| |
| } |