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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 package androidx.leanback.testutils;
     17 
     18 import static org.junit.Assert.fail;
     19 
     20 import android.app.Activity;
     21 import android.view.View;
     22 
     23 public abstract class PollingCheck {
     24 
     25     private static final long TIME_SLICE = 250;
     26     private long mTimeout = 5000;
     27 
     28     public abstract static class PollingCheckCondition {
     29         public abstract boolean canProceed();
     30 
     31         public boolean canPreProceed() {
     32             return canProceed();
     33         }
     34     }
     35 
     36     public PollingCheck() {
     37     }
     38 
     39     public PollingCheck(long timeout) {
     40         mTimeout = timeout;
     41     }
     42 
     43     protected abstract boolean check();
     44 
     45     protected boolean preCheck() {
     46         return check();
     47     }
     48 
     49     public void run() {
     50         if (preCheck()) {
     51             return;
     52         }
     53 
     54         long timeout = mTimeout;
     55         while (timeout > 0) {
     56             try {
     57                 Thread.sleep(TIME_SLICE);
     58             } catch (InterruptedException e) {
     59                 fail("unexpected InterruptedException");
     60             }
     61 
     62             if (check()) {
     63                 return;
     64             }
     65 
     66             timeout -= TIME_SLICE;
     67         }
     68 
     69         fail("unexpected timeout");
     70     }
     71 
     72     public static void waitFor(final PollingCheckCondition condition) {
     73         new PollingCheck() {
     74             @Override
     75             protected boolean check() {
     76                 return condition.canProceed();
     77             }
     78 
     79             @Override
     80             protected boolean preCheck() {
     81                 return condition.canPreProceed();
     82             }
     83         }.run();
     84     }
     85 
     86     public static void waitFor(long timeout, final PollingCheckCondition condition) {
     87         new PollingCheck(timeout) {
     88             @Override
     89             protected boolean check() {
     90                 return condition.canProceed();
     91             }
     92         }.run();
     93     }
     94 
     95     public static class ViewScreenPositionDetector {
     96 
     97         int[] lastLocation = null;
     98         int[] newLocation = new int[2];
     99 
    100         public boolean isViewStableOnScreen(View view) {
    101             if (lastLocation == null) {
    102                 // get initial location
    103                 lastLocation = new int[2];
    104                 view.getLocationInWindow(lastLocation);
    105             } else {
    106                 // get new location and compare to old location
    107                 view.getLocationInWindow(newLocation);
    108                 if (newLocation[0] == lastLocation[0]
    109                         && newLocation[1] == lastLocation[1]) {
    110                     // location stable,  animation finished
    111                     return true;
    112                 }
    113                 lastLocation[0] = newLocation[0];
    114                 lastLocation[1] = newLocation[1];
    115             }
    116             return false;
    117         }
    118     }
    119 
    120     public static class ViewStableOnScreen extends PollingCheckCondition {
    121 
    122         View mView;
    123         ViewScreenPositionDetector mDector = new ViewScreenPositionDetector();
    124 
    125         public ViewStableOnScreen(View view) {
    126             mView = view;
    127         }
    128 
    129         @Override
    130         public boolean canPreProceed() {
    131             return false;
    132         }
    133 
    134         @Override
    135         public boolean canProceed() {
    136             return mDector.isViewStableOnScreen(mView);
    137         }
    138 
    139     }
    140 
    141     public static class ActivityDestroy extends PollingCheckCondition {
    142 
    143         Activity mActivity;
    144 
    145         public ActivityDestroy(Activity activity) {
    146             mActivity = activity;
    147         }
    148 
    149         @Override
    150         public boolean canProceed() {
    151             return mActivity.isDestroyed();
    152         }
    153 
    154     }
    155 
    156 }