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