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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 import java.util.List;
     26 
     27 /* The layout logic for a TaskStackView */
     28 public class TaskStackViewFilterAlgorithm {
     29 
     30     RecentsConfiguration mConfig;
     31     TaskStackView mStackView;
     32     ViewPool<TaskView, Task> mViewPool;
     33 
     34     public TaskStackViewFilterAlgorithm(RecentsConfiguration config, TaskStackView stackView,
     35                                         ViewPool<TaskView, Task> viewPool) {
     36         mConfig = config;
     37         mStackView = stackView;
     38         mViewPool = viewPool;
     39     }
     40 
     41     /** Orchestrates the animations of the current child views and any new views. */
     42     void startFilteringAnimation(ArrayList<Task> curTasks,
     43                                  ArrayList<TaskViewTransform> curTaskTransforms,
     44                                  final ArrayList<Task> tasks,
     45                                  final ArrayList<TaskViewTransform> taskTransforms) {
     46         // Calculate the transforms to animate out all the existing views if they are not in the
     47         // new visible range (or to their final positions in the stack if they are)
     48         final ArrayList<TaskView> childrenToRemove = new ArrayList<TaskView>();
     49         final HashMap<TaskView, TaskViewTransform> childViewTransforms =
     50                 new HashMap<TaskView, TaskViewTransform>();
     51         int duration = getExitTransformsForFilterAnimation(curTasks, curTaskTransforms, tasks,
     52                 taskTransforms, childViewTransforms, childrenToRemove);
     53 
     54         // If all the current views are in the visible range of the new stack, then don't wait for
     55         // views to animate out and animate all the new views into their place
     56         final boolean unifyNewViewAnimation = childrenToRemove.isEmpty();
     57         if (unifyNewViewAnimation) {
     58             int inDuration = getEnterTransformsForFilterAnimation(tasks, taskTransforms,
     59                     childViewTransforms);
     60             duration = Math.max(duration, inDuration);
     61         }
     62 
     63         // Animate all the views to their final transforms
     64         for (final TaskView tv : childViewTransforms.keySet()) {
     65             TaskViewTransform t = childViewTransforms.get(tv);
     66             tv.animate().cancel();
     67             tv.animate()
     68                     .withEndAction(new Runnable() {
     69                         @Override
     70                         public void run() {
     71                             childViewTransforms.remove(tv);
     72                             if (childViewTransforms.isEmpty()) {
     73                                 // Return all the removed children to the view pool
     74                                 for (TaskView tv : childrenToRemove) {
     75                                     mViewPool.returnViewToPool(tv);
     76                                 }
     77 
     78                                 if (!unifyNewViewAnimation) {
     79                                     // For views that are not already visible, animate them in
     80                                     childViewTransforms.clear();
     81                                     int duration = getEnterTransformsForFilterAnimation(tasks,
     82                                             taskTransforms, childViewTransforms);
     83                                     for (final TaskView tv : childViewTransforms.keySet()) {
     84                                         TaskViewTransform t = childViewTransforms.get(tv);
     85                                         tv.updateViewPropertiesToTaskTransform(t, duration);
     86                                     }
     87                                 }
     88                             }
     89                         }
     90                     });
     91             tv.updateViewPropertiesToTaskTransform(t, duration);
     92         }
     93     }
     94 
     95     /**
     96      * Creates the animations for all the children views that need to be animated in when we are
     97      * un/filtering a stack, and returns the duration for these animations.
     98      */
     99     int getEnterTransformsForFilterAnimation(ArrayList<Task> tasks,
    100                                              ArrayList<TaskViewTransform> taskTransforms,
    101                                              HashMap<TaskView, TaskViewTransform> childViewTransformsOut) {
    102         int offset = 0;
    103         int movement = 0;
    104         int taskCount = tasks.size();
    105         for (int i = taskCount - 1; i >= 0; i--) {
    106             Task task = tasks.get(i);
    107             TaskViewTransform toTransform = taskTransforms.get(i);
    108             if (toTransform.visible) {
    109                 TaskView tv = mStackView.getChildViewForTask(task);
    110                 if (tv == null) {
    111                     // For views that are not already visible, animate them in
    112                     tv = mViewPool.pickUpViewFromPool(task, task);
    113 
    114                     // Compose a new transform to fade and slide the new task in
    115                     TaskViewTransform fromTransform = new TaskViewTransform(toTransform);
    116                     tv.prepareTaskTransformForFilterTaskHidden(fromTransform);
    117                     tv.updateViewPropertiesToTaskTransform(fromTransform, 0);
    118 
    119                     toTransform.startDelay = offset * Constants.Values.TaskStackView.FilterStartDelay;
    120                     childViewTransformsOut.put(tv, toTransform);
    121 
    122                     // Use the movement of the new views to calculate the duration of the animation
    123                     movement = Math.max(movement,
    124                             Math.abs(toTransform.translationY - fromTransform.translationY));
    125                     offset++;
    126                 }
    127             }
    128         }
    129         return mConfig.filteringNewViewsAnimDuration;
    130     }
    131 
    132     /**
    133      * Creates the animations for all the children views that need to be removed or to move views
    134      * to their un/filtered position when we are un/filtering a stack, and returns the duration
    135      * for these animations.
    136      */
    137     int getExitTransformsForFilterAnimation(ArrayList<Task> curTasks,
    138                                             ArrayList<TaskViewTransform> curTaskTransforms,
    139                                             ArrayList<Task> tasks, ArrayList<TaskViewTransform> taskTransforms,
    140                                             HashMap<TaskView, TaskViewTransform> childViewTransformsOut,
    141                                             ArrayList<TaskView> childrenToRemoveOut) {
    142         // Animate all of the existing views out of view (if they are not in the visible range in
    143         // the new stack) or to their final positions in the new stack
    144         int offset = 0;
    145         int movement = 0;
    146         List<TaskView> taskViews = mStackView.getTaskViews();
    147         int taskViewCount = taskViews.size();
    148         for (int i = 0; i < taskViewCount; i++) {
    149             TaskView tv = taskViews.get(i);
    150             Task task = tv.getTask();
    151             int taskIndex = tasks.indexOf(task);
    152             TaskViewTransform toTransform;
    153 
    154             // If the view is no longer visible, then we should just animate it out
    155             boolean willBeInvisible = taskIndex < 0 || !taskTransforms.get(taskIndex).visible;
    156             if (willBeInvisible) {
    157                 if (taskIndex < 0) {
    158                     toTransform = curTaskTransforms.get(curTasks.indexOf(task));
    159                 } else {
    160                     toTransform = new TaskViewTransform(taskTransforms.get(taskIndex));
    161                 }
    162                 tv.prepareTaskTransformForFilterTaskVisible(toTransform);
    163                 childrenToRemoveOut.add(tv);
    164             } else {
    165                 toTransform = taskTransforms.get(taskIndex);
    166                 // Use the movement of the visible views to calculate the duration of the animation
    167                 movement = Math.max(movement, Math.abs(toTransform.translationY -
    168                         (int) tv.getTranslationY()));
    169             }
    170 
    171             toTransform.startDelay = offset * Constants.Values.TaskStackView.FilterStartDelay;
    172             childViewTransformsOut.put(tv, toTransform);
    173             offset++;
    174         }
    175         return mConfig.filteringCurrentViewsAnimDuration;
    176     }
    177 
    178 }