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 17 package com.android.systemui.statusbar; 18 19 import android.view.View; 20 21 import com.android.systemui.Interpolators; 22 import com.android.systemui.statusbar.stack.StackStateAnimator; 23 24 /** 25 * A helper to fade views in and out. 26 */ 27 public class CrossFadeHelper { 28 public static final long ANIMATION_DURATION_LENGTH = 210; 29 fadeOut(final View view, final Runnable endRunnable)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 fadeOut(View view, float fadeOutAmount)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 mapToFadeDuration(float fadeOutAmount)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 updateLayerType(View view, float alpha)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 fadeIn(final View view)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 fadeIn(View view, float fadeInAmount)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