1/*
2 * Copyright (C) 2016 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.transition;
18
19import android.graphics.Matrix;
20import android.support.annotation.NonNull;
21import android.support.annotation.RequiresApi;
22import android.view.View;
23import android.view.ViewParent;
24
25@RequiresApi(14)
26class ViewUtilsApi14 implements ViewUtilsImpl {
27
28    private float[] mMatrixValues;
29
30    @Override
31    public ViewOverlayImpl getOverlay(@NonNull View view) {
32        return ViewOverlayApi14.createFrom(view);
33    }
34
35    @Override
36    public WindowIdImpl getWindowId(@NonNull View view) {
37        return new WindowIdApi14(view.getWindowToken());
38    }
39
40    @Override
41    public void setTransitionAlpha(@NonNull View view, float alpha) {
42        Float savedAlpha = (Float) view.getTag(R.id.save_non_transition_alpha);
43        if (savedAlpha != null) {
44            view.setAlpha(savedAlpha * alpha);
45        } else {
46            view.setAlpha(alpha);
47        }
48    }
49
50    @Override
51    public float getTransitionAlpha(@NonNull View view) {
52        Float savedAlpha = (Float) view.getTag(R.id.save_non_transition_alpha);
53        if (savedAlpha != null) {
54            return view.getAlpha() / savedAlpha;
55        } else {
56            return view.getAlpha();
57        }
58    }
59
60    @Override
61    public void saveNonTransitionAlpha(@NonNull View view) {
62        if (view.getTag(R.id.save_non_transition_alpha) == null) {
63            view.setTag(R.id.save_non_transition_alpha, view.getAlpha());
64        }
65    }
66
67    @Override
68    public void clearNonTransitionAlpha(@NonNull View view) {
69        // We don't clear the saved value when the view is hidden; that's the situation we are
70        // saving this value for.
71        if (view.getVisibility() == View.VISIBLE) {
72            view.setTag(R.id.save_non_transition_alpha, null);
73        }
74    }
75
76    @Override
77    public void transformMatrixToGlobal(@NonNull View view, @NonNull Matrix matrix) {
78        final ViewParent parent = view.getParent();
79        if (parent instanceof View) {
80            final View vp = (View) parent;
81            transformMatrixToGlobal(vp, matrix);
82            matrix.preTranslate(-vp.getScrollX(), -vp.getScrollY());
83        }
84        matrix.preTranslate(view.getLeft(), view.getTop());
85        final Matrix vm = view.getMatrix();
86        if (!vm.isIdentity()) {
87            matrix.preConcat(vm);
88        }
89    }
90
91    @Override
92    public void transformMatrixToLocal(@NonNull View view, @NonNull Matrix matrix) {
93        final ViewParent parent = view.getParent();
94        if (parent instanceof View) {
95            final View vp = (View) parent;
96            transformMatrixToLocal(vp, matrix);
97            matrix.postTranslate(vp.getScrollX(), vp.getScrollY());
98        }
99        matrix.postTranslate(view.getLeft(), view.getTop());
100        final Matrix vm = view.getMatrix();
101        if (!vm.isIdentity()) {
102            final Matrix inverted = new Matrix();
103            if (vm.invert(inverted)) {
104                matrix.postConcat(inverted);
105            }
106        }
107    }
108
109    @Override
110    public void setAnimationMatrix(@NonNull View view, Matrix matrix) {
111        if (matrix == null || matrix.isIdentity()) {
112            view.setPivotX(view.getWidth() / 2);
113            view.setPivotY(view.getHeight() / 2);
114            view.setTranslationX(0);
115            view.setTranslationY(0);
116            view.setScaleX(1);
117            view.setScaleY(1);
118            view.setRotation(0);
119        } else {
120            float[] values = mMatrixValues;
121            if (values == null) {
122                mMatrixValues = values = new float[9];
123            }
124            matrix.getValues(values);
125            final float sin = values[Matrix.MSKEW_Y];
126            final float cos = (float) Math.sqrt(1 - sin * sin)
127                    * (values[Matrix.MSCALE_X] < 0 ? -1 : 1);
128            final float rotation = (float) Math.toDegrees(Math.atan2(sin, cos));
129            final float scaleX = values[Matrix.MSCALE_X] / cos;
130            final float scaleY = values[Matrix.MSCALE_Y] / cos;
131            final float dx = values[Matrix.MTRANS_X];
132            final float dy = values[Matrix.MTRANS_Y];
133            view.setPivotX(0);
134            view.setPivotY(0);
135            view.setTranslationX(dx);
136            view.setTranslationY(dy);
137            view.setRotation(rotation);
138            view.setScaleX(scaleX);
139            view.setScaleY(scaleY);
140        }
141    }
142
143    @Override
144    public void setLeftTopRightBottom(View v, int left, int top, int right, int bottom) {
145        v.setLeft(left);
146        v.setTop(top);
147        v.setRight(right);
148        v.setBottom(bottom);
149    }
150
151}
152