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      1 /*
      2  * Copyright (C) 2014 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.recents.views;
     18 
     19 import com.android.systemui.recents.Constants;
     20 import com.android.systemui.recents.RecentsConfiguration;
     21 import com.android.systemui.recents.model.Task;
     22 
     23 import java.util.ArrayList;
     24 import java.util.HashMap;
     25 
     26 /* The layout logic for a TaskStackView */
     27 public class TaskStackViewFilterAlgorithm {
     28 
     29     RecentsConfiguration mConfig;
     30     TaskStackView mStackView;
     31     ViewPool<TaskView, Task> mViewPool;
     32 
     33     public TaskStackViewFilterAlgorithm(RecentsConfiguration config, TaskStackView stackView,
     34                                         ViewPool<TaskView, Task> viewPool) {
     35         mConfig = config;
     36         mStackView = stackView;
     37         mViewPool = viewPool;
     38     }
     39 
     40     /** Orchestrates the animations of the current child views and any new views. */
     41     void startFilteringAnimation(ArrayList<Task> curTasks,
     42                                  ArrayList<TaskViewTransform> curTaskTransforms,
     43                                  final ArrayList<Task> tasks,
     44                                  final ArrayList<TaskViewTransform> taskTransforms) {
     45         // Calculate the transforms to animate out all the existing views if they are not in the
     46         // new visible range (or to their final positions in the stack if they are)
     47         final ArrayList<TaskView> childrenToRemove = new ArrayList<TaskView>();
     48         final HashMap<TaskView, TaskViewTransform> childViewTransforms =
     49                 new HashMap<TaskView, TaskViewTransform>();
     50         int duration = getExitTransformsForFilterAnimation(curTasks, curTaskTransforms, tasks,
     51                 taskTransforms, childViewTransforms, childrenToRemove);
     52 
     53         // If all the current views are in the visible range of the new stack, then don't wait for
     54         // views to animate out and animate all the new views into their place
     55         final boolean unifyNewViewAnimation = childrenToRemove.isEmpty();
     56         if (unifyNewViewAnimation) {
     57             int inDuration = getEnterTransformsForFilterAnimation(tasks, taskTransforms,
     58                     childViewTransforms);
     59             duration = Math.max(duration, inDuration);
     60         }
     61 
     62         // Animate all the views to their final transforms
     63         for (final TaskView tv : childViewTransforms.keySet()) {
     64             TaskViewTransform t = childViewTransforms.get(tv);
     65             tv.animate().cancel();
     66             tv.animate()
     67                     .withEndAction(new Runnable() {
     68                         @Override
     69                         public void run() {
     70                             childViewTransforms.remove(tv);
     71                             if (childViewTransforms.isEmpty()) {
     72                                 // Return all the removed children to the view pool
     73                                 for (TaskView tv : childrenToRemove) {
     74                                     mViewPool.returnViewToPool(tv);
     75                                 }
     76 
     77                                 if (!unifyNewViewAnimation) {
     78                                     // For views that are not already visible, animate them in
     79                                     childViewTransforms.clear();
     80                                     int duration = getEnterTransformsForFilterAnimation(tasks,
     81                                             taskTransforms, childViewTransforms);
     82                                     for (final TaskView tv : childViewTransforms.keySet()) {
     83                                         TaskViewTransform t = childViewTransforms.get(tv);
     84                                         tv.updateViewPropertiesToTaskTransform(t, duration);
     85                                     }
     86                                 }
     87                             }
     88                         }
     89                     });
     90             tv.updateViewPropertiesToTaskTransform(t, duration);
     91         }
     92     }
     93 
     94     /**
     95      * Creates the animations for all the children views that need to be animated in when we are
     96      * un/filtering a stack, and returns the duration for these animations.
     97      */
     98     int getEnterTransformsForFilterAnimation(ArrayList<Task> tasks,
     99                                              ArrayList<TaskViewTransform> taskTransforms,
    100                                              HashMap<TaskView, TaskViewTransform> childViewTransformsOut) {
    101         int offset = 0;
    102         int movement = 0;
    103         int taskCount = tasks.size();
    104         for (int i = taskCount - 1; i >= 0; i--) {
    105             Task task = tasks.get(i);
    106             TaskViewTransform toTransform = taskTransforms.get(i);
    107             if (toTransform.visible) {
    108                 TaskView tv = mStackView.getChildViewForTask(task);
    109                 if (tv == null) {
    110                     // For views that are not already visible, animate them in
    111                     tv = mViewPool.pickUpViewFromPool(task, task);
    112 
    113                     // Compose a new transform to fade and slide the new task in
    114                     TaskViewTransform fromTransform = new TaskViewTransform(toTransform);
    115                     tv.prepareTaskTransformForFilterTaskHidden(fromTransform);
    116                     tv.updateViewPropertiesToTaskTransform(fromTransform, 0);
    117 
    118                     toTransform.startDelay = offset * Constants.Values.TaskStackView.FilterStartDelay;
    119                     childViewTransformsOut.put(tv, toTransform);
    120 
    121                     // Use the movement of the new views to calculate the duration of the animation
    122                     movement = Math.max(movement,
    123                             Math.abs(toTransform.translationY - fromTransform.translationY));
    124                     offset++;
    125                 }
    126             }
    127         }
    128         return mConfig.filteringNewViewsAnimDuration;
    129     }
    130 
    131     /**
    132      * Creates the animations for all the children views that need to be removed or to move views
    133      * to their un/filtered position when we are un/filtering a stack, and returns the duration
    134      * for these animations.
    135      */
    136     int getExitTransformsForFilterAnimation(ArrayList<Task> curTasks,
    137                                             ArrayList<TaskViewTransform> curTaskTransforms,
    138                                             ArrayList<Task> tasks, ArrayList<TaskViewTransform> taskTransforms,
    139                                             HashMap<TaskView, TaskViewTransform> childViewTransformsOut,
    140                                             ArrayList<TaskView> childrenToRemoveOut) {
    141         // Animate all of the existing views out of view (if they are not in the visible range in
    142         // the new stack) or to their final positions in the new stack
    143         int offset = 0;
    144         int movement = 0;
    145         int childCount = mStackView.getChildCount();
    146         for (int i = 0; i < childCount; i++) {
    147             TaskView tv = (TaskView) mStackView.getChildAt(i);
    148             Task task = tv.getTask();
    149             int taskIndex = tasks.indexOf(task);
    150             TaskViewTransform toTransform;
    151 
    152             // If the view is no longer visible, then we should just animate it out
    153             boolean willBeInvisible = taskIndex < 0 || !taskTransforms.get(taskIndex).visible;
    154             if (willBeInvisible) {
    155                 if (taskIndex < 0) {
    156                     toTransform = curTaskTransforms.get(curTasks.indexOf(task));
    157                 } else {
    158                     toTransform = new TaskViewTransform(taskTransforms.get(taskIndex));
    159                 }
    160                 tv.prepareTaskTransformForFilterTaskVisible(toTransform);
    161                 childrenToRemoveOut.add(tv);
    162             } else {
    163                 toTransform = taskTransforms.get(taskIndex);
    164                 // Use the movement of the visible views to calculate the duration of the animation
    165                 movement = Math.max(movement, Math.abs(toTransform.translationY -
    166                         (int) tv.getTranslationY()));
    167             }
    168 
    169             toTransform.startDelay = offset * Constants.Values.TaskStackView.FilterStartDelay;
    170             childViewTransformsOut.put(tv, toTransform);
    171             offset++;
    172         }
    173         return mConfig.filteringCurrentViewsAnimDuration;
    174     }
    175 
    176 }