1/*
2 * Copyright (C) 2014 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
5 * in compliance with the License. You may obtain a copy of the License at
6 *
7 * http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software distributed under the License
10 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
11 * or implied. See the License for the specific language governing permissions and limitations under
12 * the License.
13 */
14package android.support.v17.leanback.transition;
15
16import android.animation.AnimatorInflater;
17import android.content.Context;
18import android.os.Build;
19import android.support.v17.leanback.R;
20import android.view.Gravity;
21import android.view.View;
22import android.view.animation.DecelerateInterpolator;
23import android.view.animation.Interpolator;
24
25/**
26 * Helper class to load Leanback specific transition.
27 * @hide
28 */
29public class LeanbackTransitionHelper {
30
31    static interface LeanbackTransitionHelperVersion {
32
33        public Object loadTitleInTransition(Context context, TransitionHelper helper);
34
35        public Object loadTitleOutTransition(Context context, TransitionHelper helper);
36    }
37
38    /*
39     * Kitkat does not allow load custom transition from resource, calling
40     * LeanbackTransitionHelperKitKat to build custom transition in code.
41     */
42    static class LeanbackTransitionHelperKitKatImpl implements LeanbackTransitionHelperVersion {
43
44        @Override
45        public Object loadTitleInTransition(Context context, TransitionHelper helper) {
46            return LeanbackTransitionHelperKitKat.loadTitleInTransition(context);
47        }
48
49        @Override
50        public Object loadTitleOutTransition(Context context, TransitionHelper helper) {
51            return LeanbackTransitionHelperKitKat.loadTitleOutTransition(context);
52        }
53    }
54
55    /*
56     * Load transition from resource or just return stub for API17.
57     */
58    static class LeanbackTransitionHelperDefault implements LeanbackTransitionHelperVersion {
59
60        @Override
61        public Object loadTitleInTransition(Context context, TransitionHelper helper) {
62            return helper.loadTransition(context, R.transition.lb_title_in);
63        }
64
65        @Override
66        public Object loadTitleOutTransition(Context context, TransitionHelper helper) {
67            return helper.loadTransition(context, R.transition.lb_title_out);
68        }
69    }
70
71    static LeanbackTransitionHelperVersion sImpl;
72
73    static {
74        if (Build.VERSION.SDK_INT >= 21) {
75            sImpl = new LeanbackTransitionHelperDefault();
76        } else if (Build.VERSION.SDK_INT >= 19) {
77            sImpl = new LeanbackTransitionHelperKitKatImpl();
78        } else {
79            // Helper will create a stub object for transition in this case.
80            sImpl = new LeanbackTransitionHelperDefault();
81        }
82    }
83
84    static public Object loadTitleInTransition(Context context, TransitionHelper helper) {
85        return sImpl.loadTitleInTransition(context, helper);
86    }
87
88    static public Object loadTitleOutTransition(Context context, TransitionHelper helper) {
89        return sImpl.loadTitleOutTransition(context, helper);
90    }
91}
92