1/* 2 * Copyright (C) 2015 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17package android.support.design.widget; 18 19import android.graphics.Matrix; 20import android.graphics.Rect; 21import android.graphics.RectF; 22import android.view.View; 23import android.view.ViewGroup; 24import android.view.ViewParent; 25 26class ViewGroupUtilsHoneycomb { 27 private static final ThreadLocal<Matrix> sMatrix = new ThreadLocal<>(); 28 private static final ThreadLocal<RectF> sRectF = new ThreadLocal<>(); 29 private static final Matrix IDENTITY = new Matrix(); 30 31 public static void offsetDescendantRect(ViewGroup group, View child, Rect rect) { 32 Matrix m = sMatrix.get(); 33 if (m == null) { 34 m = new Matrix(); 35 sMatrix.set(m); 36 } else { 37 m.set(IDENTITY); 38 } 39 40 offsetDescendantMatrix(group, child, m); 41 42 RectF rectF = sRectF.get(); 43 if (rectF == null) { 44 rectF = new RectF(); 45 } 46 rectF.set(rect); 47 m.mapRect(rectF); 48 rect.set((int) (rectF.left + 0.5f), (int) (rectF.top + 0.5f), 49 (int) (rectF.right + 0.5f), (int) (rectF.bottom + 0.5f)); 50 } 51 52 static void offsetDescendantMatrix(ViewParent target, View view, Matrix m) { 53 final ViewParent parent = view.getParent(); 54 if (parent instanceof View && parent != target) { 55 final View vp = (View) parent; 56 offsetDescendantMatrix(target, vp, m); 57 m.preTranslate(-vp.getScrollX(), -vp.getScrollY()); 58 } 59 60 m.preTranslate(view.getLeft(), view.getTop()); 61 62 if (!view.getMatrix().isIdentity()) { 63 m.preConcat(view.getMatrix()); 64 } 65 } 66} 67