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      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 
     30     public static void fadeOut(final View view, final Runnable endRunnable) {
     31         fadeOut(view, ANIMATION_DURATION_LENGTH, 0, endRunnable);
     32     }
     33 
     34     public static void fadeOut(final View view, long duration, int delay,
     35             final Runnable endRunnable) {
     36         view.animate().cancel();
     37         view.animate()
     38                 .alpha(0f)
     39                 .setDuration(duration)
     40                 .setInterpolator(Interpolators.ALPHA_OUT)
     41                 .setStartDelay(delay)
     42                 .withEndAction(new Runnable() {
     43                     @Override
     44                     public void run() {
     45                         if (endRunnable != null) {
     46                             endRunnable.run();
     47                         }
     48                         view.setVisibility(View.INVISIBLE);
     49                     }
     50                 });
     51         if (view.hasOverlappingRendering()) {
     52             view.animate().withLayer();
     53         }
     54     }
     55 
     56     public static void fadeOut(View view, float fadeOutAmount) {
     57         fadeOut(view, fadeOutAmount, true /* remap */);
     58     }
     59 
     60     /**
     61      * Fade out a view by a given progress amount
     62      * @param view the view to fade out
     63      * @param fadeOutAmount how much the view is faded out. 0 means not at all and 1 means fully
     64      *                      faded out
     65      * @param remap whether the fade amount should be remapped to the shorter duration
     66      * {@link #ANIMATION_DURATION_LENGTH} from the normal fade duration
     67      * {@link StackStateAnimator#ANIMATION_DURATION_STANDARD} in order to have a faster fading.
     68      *
     69      * @see #fadeIn(View, float, boolean)
     70      */
     71     public static void fadeOut(View view, float fadeOutAmount, boolean remap) {
     72         view.animate().cancel();
     73         if (fadeOutAmount == 1.0f) {
     74             view.setVisibility(View.INVISIBLE);
     75         } else if (view.getVisibility() == View.INVISIBLE) {
     76             view.setVisibility(View.VISIBLE);
     77         }
     78         if (remap) {
     79             fadeOutAmount = mapToFadeDuration(fadeOutAmount);
     80         }
     81         float alpha = Interpolators.ALPHA_OUT.getInterpolation(1.0f - fadeOutAmount);
     82         view.setAlpha(alpha);
     83         updateLayerType(view, alpha);
     84     }
     85 
     86     private static float mapToFadeDuration(float fadeOutAmount) {
     87         // Assuming a linear interpolator, we can easily map it to our new duration
     88         float endPoint = (float) ANIMATION_DURATION_LENGTH
     89                 / (float) StackStateAnimator.ANIMATION_DURATION_STANDARD;
     90         return Math.min(fadeOutAmount / endPoint, 1.0f);
     91     }
     92 
     93     private static void updateLayerType(View view, float alpha) {
     94         if (view.hasOverlappingRendering() && alpha > 0.0f && alpha < 1.0f) {
     95             view.setLayerType(View.LAYER_TYPE_HARDWARE, null);
     96         } else if (view.getLayerType() == View.LAYER_TYPE_HARDWARE) {
     97             view.setLayerType(View.LAYER_TYPE_NONE, null);
     98         }
     99     }
    100 
    101     public static void fadeIn(final View view) {
    102         fadeIn(view, ANIMATION_DURATION_LENGTH, 0);
    103     }
    104 
    105     public static void fadeIn(final View view, long duration, int delay) {
    106         view.animate().cancel();
    107         if (view.getVisibility() == View.INVISIBLE) {
    108             view.setAlpha(0.0f);
    109             view.setVisibility(View.VISIBLE);
    110         }
    111         view.animate()
    112                 .alpha(1f)
    113                 .setDuration(duration)
    114                 .setStartDelay(delay)
    115                 .setInterpolator(Interpolators.ALPHA_IN)
    116                 .withEndAction(null);
    117         if (view.hasOverlappingRendering()) {
    118             view.animate().withLayer();
    119         }
    120     }
    121 
    122     public static void fadeIn(View view, float fadeInAmount) {
    123         fadeIn(view, fadeInAmount, true /* remap */);
    124     }
    125 
    126     /**
    127      * Fade in a view by a given progress amount
    128      * @param view the view to fade in
    129      * @param fadeInAmount how much the view is faded in. 0 means not at all and 1 means fully
    130      *                     faded in.
    131      * @param remap whether the fade amount should be remapped to the shorter duration
    132      * {@link #ANIMATION_DURATION_LENGTH} from the normal fade duration
    133      * {@link StackStateAnimator#ANIMATION_DURATION_STANDARD} in order to have a faster fading.
    134      *
    135      * @see #fadeOut(View, float, boolean)
    136      */
    137     public static void fadeIn(View view, float fadeInAmount, boolean remap) {
    138         view.animate().cancel();
    139         if (view.getVisibility() == View.INVISIBLE) {
    140             view.setVisibility(View.VISIBLE);
    141         }
    142         if (remap) {
    143             fadeInAmount = mapToFadeDuration(fadeInAmount);
    144         }
    145         float alpha = Interpolators.ALPHA_IN.getInterpolation(fadeInAmount);
    146         view.setAlpha(alpha);
    147         updateLayerType(view, alpha);
    148     }
    149 }
    150