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.animation.TimeInterpolator;
22import android.view.View;
23import android.view.ViewGroup;
24import android.view.animation.AccelerateInterpolator;
25import android.view.animation.DecelerateInterpolator;
26
27/**
28 * This transition captures the visibility of target objects before and
29 * after a scene change and animates any changes by sliding the target
30 * objects into or out of place.
31 *
32 * @hide
33 */
34public class Slide extends Visibility {
35
36    // TODO: Add parameter for sliding factor - it's hard-coded below
37
38    private static final TimeInterpolator sAccelerator = new AccelerateInterpolator();
39    private static final TimeInterpolator sDecelerator = new DecelerateInterpolator();
40
41    @Override
42    public Animator onAppear(ViewGroup sceneRoot,
43            TransitionValues startValues, int startVisibility,
44            TransitionValues endValues, int endVisibility) {
45        View endView = (endValues != null) ? endValues.view : null;
46        endView.setTranslationY(-2 * endView.getHeight());
47        ObjectAnimator anim = ObjectAnimator.ofFloat(endView, View.TRANSLATION_Y,
48                -2 * endView.getHeight(), 0);
49        anim.setInterpolator(sDecelerator);
50        return anim;
51    }
52
53    @Override
54    public Animator onDisappear(ViewGroup sceneRoot,
55            TransitionValues startValues, int startVisibility,
56            TransitionValues endValues, int endVisibility) {
57        View startView = (startValues != null) ? startValues.view : null;
58        startView.setTranslationY(0);
59        ObjectAnimator anim = ObjectAnimator.ofFloat(startView, View.TRANSLATION_Y, 0,
60                -2 * startView.getHeight());
61        anim.setInterpolator(sAccelerator);
62        return anim;
63    }
64
65}
66