1/*
2 * Copyright (C) 2013 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.transition;
18
19import android.animation.Animator;
20import android.animation.ObjectAnimator;
21import android.view.View;
22import android.view.ViewGroup;
23
24/**
25 * This transition captures the rotation property of targets before and after
26 * the scene change and animates any changes.
27 *
28 * @hide
29 */
30public class Rotate extends Transition {
31
32    private static final String PROPNAME_ROTATION = "android:rotate:rotation";
33
34    @Override
35    public void captureStartValues(TransitionValues transitionValues) {
36        transitionValues.values.put(PROPNAME_ROTATION, transitionValues.view.getRotation());
37    }
38
39    @Override
40    public void captureEndValues(TransitionValues transitionValues) {
41        transitionValues.values.put(PROPNAME_ROTATION, transitionValues.view.getRotation());
42    }
43
44    @Override
45    public Animator createAnimator(ViewGroup sceneRoot, TransitionValues startValues,
46            TransitionValues endValues) {
47        if (startValues == null || endValues == null) {
48            return null;
49        }
50        final View view = endValues.view;
51        float startRotation = (Float) startValues.values.get(PROPNAME_ROTATION);
52        float endRotation = (Float) endValues.values.get(PROPNAME_ROTATION);
53        if (startRotation != endRotation) {
54            view.setRotation(startRotation);
55            return ObjectAnimator.ofFloat(view, View.ROTATION,
56                    startRotation, endRotation);
57        }
58        return null;
59    }
60}
61