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      1 /*
      2  * Copyright (C) 2019 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.glwallpaper;
     18 
     19 import android.animation.Animator;
     20 import android.animation.AnimatorListenerAdapter;
     21 import android.animation.ValueAnimator;
     22 
     23 import com.android.systemui.Interpolators;
     24 
     25 /**
     26  * Use ValueAnimator and appropriate interpolator to control the progress of reveal transition.
     27  * The transition will happen while getting awake and quit events.
     28  */
     29 class ImageRevealHelper {
     30     private static final String TAG = ImageRevealHelper.class.getSimpleName();
     31     private static final float MAX_REVEAL = 0f;
     32     private static final float MIN_REVEAL = 1f;
     33 
     34     private final ValueAnimator mAnimator;
     35     private final RevealStateListener mRevealListener;
     36     private float mReveal = MAX_REVEAL;
     37     private boolean mAwake = false;
     38 
     39     ImageRevealHelper(RevealStateListener listener) {
     40         mRevealListener = listener;
     41         mAnimator = ValueAnimator.ofFloat();
     42         mAnimator.setInterpolator(Interpolators.FAST_OUT_SLOW_IN);
     43         mAnimator.addUpdateListener(animator -> {
     44             mReveal = (float) animator.getAnimatedValue();
     45             if (mRevealListener != null) {
     46                 mRevealListener.onRevealStateChanged();
     47             }
     48         });
     49         mAnimator.addListener(new AnimatorListenerAdapter() {
     50             private boolean mIsCanceled;
     51 
     52             @Override
     53             public void onAnimationCancel(Animator animation) {
     54                 mIsCanceled = true;
     55             }
     56 
     57             @Override
     58             public void onAnimationEnd(Animator animation) {
     59                 if (!mIsCanceled && mRevealListener != null) {
     60                     mRevealListener.onRevealEnd();
     61                 }
     62                 mIsCanceled = false;
     63             }
     64 
     65             @Override
     66             public void onAnimationStart(Animator animation) {
     67                 if (mRevealListener != null) {
     68                     mRevealListener.onRevealStart(true /* animate */);
     69                 }
     70             }
     71         });
     72     }
     73 
     74     private void animate() {
     75         mAnimator.cancel();
     76         mAnimator.setFloatValues(mReveal, mAwake ? MAX_REVEAL : MIN_REVEAL);
     77         mAnimator.start();
     78     }
     79 
     80     public float getReveal() {
     81         return mReveal;
     82     }
     83 
     84     void updateAwake(boolean awake, long duration) {
     85         mAwake = awake;
     86         mAnimator.setDuration(duration);
     87         if (duration == 0) {
     88             // We are transiting from home to aod or aod to home directly,
     89             // we don't need to do transition in these cases.
     90             mReveal = mAwake ? MAX_REVEAL : MIN_REVEAL;
     91             mRevealListener.onRevealStart(false /* animate */);
     92             mRevealListener.onRevealStateChanged();
     93             mRevealListener.onRevealEnd();
     94         } else {
     95             animate();
     96         }
     97     }
     98 
     99     /**
    100      * A listener to trace value changes of reveal.
    101      */
    102     public interface RevealStateListener {
    103 
    104         /**
    105          * Called back while reveal status changes.
    106          */
    107         void onRevealStateChanged();
    108 
    109         /**
    110          * Called back while reveal starts.
    111          */
    112         void onRevealStart(boolean animate);
    113 
    114         /**
    115          * Called back while reveal ends.
    116          */
    117         void onRevealEnd();
    118     }
    119 }
    120