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 com.android.systemui.statusbar;
18
19import android.view.View;
20
21import com.android.systemui.Interpolators;
22import com.android.systemui.statusbar.stack.StackStateAnimator;
23
24/**
25 * A helper to fade views in and out.
26 */
27public class CrossFadeHelper {
28    public static final long ANIMATION_DURATION_LENGTH = 210;
29
30    public static void fadeOut(final View view, final Runnable endRunnable) {
31        view.animate().cancel();
32        view.animate()
33                .alpha(0f)
34                .setDuration(ANIMATION_DURATION_LENGTH)
35                .setInterpolator(Interpolators.ALPHA_OUT)
36                .withEndAction(new Runnable() {
37                    @Override
38                    public void run() {
39                        if (endRunnable != null) {
40                            endRunnable.run();
41                        }
42                        view.setVisibility(View.INVISIBLE);
43                    }
44                });
45        if (view.hasOverlappingRendering()) {
46            view.animate().withLayer();
47        }
48    }
49
50    public static void fadeOut(View view, float fadeOutAmount) {
51        view.animate().cancel();
52        if (fadeOutAmount == 1.0f) {
53            view.setVisibility(View.INVISIBLE);
54        } else if (view.getVisibility() == View.INVISIBLE) {
55            view.setVisibility(View.VISIBLE);
56        }
57        fadeOutAmount = mapToFadeDuration(fadeOutAmount);
58        float alpha = Interpolators.ALPHA_OUT.getInterpolation(1.0f - fadeOutAmount);
59        view.setAlpha(alpha);
60        updateLayerType(view, alpha);
61    }
62
63    private static float mapToFadeDuration(float fadeOutAmount) {
64        // Assuming a linear interpolator, we can easily map it to our new duration
65        float endPoint = (float) ANIMATION_DURATION_LENGTH
66                / (float) StackStateAnimator.ANIMATION_DURATION_STANDARD;
67        return Math.min(fadeOutAmount / endPoint, 1.0f);
68    }
69
70    private static void updateLayerType(View view, float alpha) {
71        if (view.hasOverlappingRendering() && alpha > 0.0f && alpha < 1.0f) {
72            view.setLayerType(View.LAYER_TYPE_HARDWARE, null);
73        } else if (view.getLayerType() == View.LAYER_TYPE_HARDWARE) {
74            view.setLayerType(View.LAYER_TYPE_NONE, null);
75        }
76    }
77
78    public static void fadeIn(final View view) {
79        view.animate().cancel();
80        if (view.getVisibility() == View.INVISIBLE) {
81            view.setAlpha(0.0f);
82            view.setVisibility(View.VISIBLE);
83        }
84        view.animate()
85                .alpha(1f)
86                .setDuration(ANIMATION_DURATION_LENGTH)
87                .setInterpolator(Interpolators.ALPHA_IN)
88                .withEndAction(null);
89        if (view.hasOverlappingRendering()) {
90            view.animate().withLayer();
91        }
92    }
93
94    public static void fadeIn(View view, float fadeInAmount) {
95        view.animate().cancel();
96        if (view.getVisibility() == View.INVISIBLE) {
97            view.setVisibility(View.VISIBLE);
98        }
99        fadeInAmount = mapToFadeDuration(fadeInAmount);
100        float alpha = Interpolators.ALPHA_IN.getInterpolation(fadeInAmount);
101        view.setAlpha(alpha);
102        updateLayerType(view, alpha);
103    }
104}
105