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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 com.android.systemui.recents.tv.views;
     17 
     18 import android.animation.Animator;
     19 import android.animation.AnimatorSet;
     20 import android.content.Context;
     21 import android.support.v17.leanback.widget.HorizontalGridView;
     22 import android.util.AttributeSet;
     23 import android.view.View;
     24 
     25 import com.android.systemui.R;
     26 import com.android.systemui.recents.RecentsActivity;
     27 import com.android.systemui.recents.events.EventBus;
     28 import com.android.systemui.recents.events.ui.AllTaskViewsDismissedEvent;
     29 import com.android.systemui.recents.model.Task;
     30 import com.android.systemui.recents.model.TaskStack;
     31 import com.android.systemui.recents.model.TaskStack.TaskStackCallbacks;
     32 import com.android.systemui.recents.views.AnimationProps;
     33 
     34 /**
     35  * Horizontal Grid View Implementation to show the Task Stack for TV.
     36  */
     37 public class TaskStackHorizontalGridView extends HorizontalGridView implements TaskStackCallbacks {
     38     private static final int ANIMATION_DELAY_MS = 50;
     39     private static final int MSG_START_RECENT_ROW_FOCUS_ANIMATION = 100;
     40     private TaskStack mStack;
     41     private Task mFocusedTask;
     42     private AnimatorSet mRecentsRowFocusAnimation;
     43 
     44     public TaskStackHorizontalGridView(Context context) {
     45         this(context, null);
     46     }
     47 
     48     public TaskStackHorizontalGridView(Context context, AttributeSet attrs) {
     49         super(context, attrs);
     50     }
     51 
     52     @Override
     53     protected void onAttachedToWindow() {
     54         EventBus.getDefault().register(this, RecentsActivity.EVENT_BUS_PRIORITY + 1);
     55         setWindowAlignment(WINDOW_ALIGN_NO_EDGE);
     56         setImportantForAccessibility(View.IMPORTANT_FOR_ACCESSIBILITY_YES);
     57         super.onAttachedToWindow();
     58     }
     59 
     60     @Override
     61     protected void onDetachedFromWindow() {
     62         super.onDetachedFromWindow();
     63         EventBus.getDefault().unregister(this);
     64     }
     65 
     66     /**
     67      * Initializes the grid view.
     68      * @param stack
     69      */
     70     public void init(TaskStack stack) {
     71         // Set new stack
     72         mStack = stack;
     73         if (mStack != null) {
     74             mStack.setCallbacks(this);
     75         }
     76     }
     77 
     78     /**
     79      * @return Returns the task stack.
     80      */
     81     public TaskStack getStack() {
     82         return mStack;
     83     }
     84 
     85     /**
     86      * @return - The focused task.
     87      */
     88     public Task getFocusedTask() {
     89         if (findFocus() != null) {
     90             mFocusedTask = ((TaskCardView)findFocus()).getTask();
     91         }
     92         return mFocusedTask;
     93     }
     94 
     95     /**
     96      * @param task
     97      * @return Child view for given task
     98      */
     99     public TaskCardView getChildViewForTask(Task task) {
    100         for (int i = 0; i < getChildCount(); i++) {
    101             TaskCardView tv = (TaskCardView) getChildAt(i);
    102             if (tv.getTask() == task) {
    103                 return tv;
    104             }
    105         }
    106         return null;
    107     }
    108 
    109 
    110     /**
    111      * Starts the Recents row's focus gain animation.
    112      */
    113     public void startFocusGainAnimation() {
    114         for (int i = 0; i < getChildCount(); i++) {
    115             TaskCardView v = (TaskCardView) getChildAt(i);
    116             if (v.hasFocus()) {
    117                 v.getViewFocusAnimator().changeSize(true);
    118             }
    119             v.getRecentsRowFocusAnimationHolder().startFocusGainAnimation();
    120         }
    121     }
    122 
    123     /**
    124      * Starts the Recents row's focus loss animation.
    125      */
    126     public void startFocusLossAnimation() {
    127         for (int i = 0; i < getChildCount(); i++) {
    128             TaskCardView v = (TaskCardView) getChildAt(i);
    129             if (v.hasFocus()) {
    130                 v.getViewFocusAnimator().changeSize(false);
    131             }
    132             v.getRecentsRowFocusAnimationHolder().startFocusLossAnimation();
    133         }
    134     }
    135 
    136     @Override
    137     public void onStackTaskAdded(TaskStack stack, Task newTask) {
    138         ((TaskStackHorizontalViewAdapter) getAdapter()).addTaskAt(newTask,
    139                 stack.indexOfStackTask(newTask));
    140     }
    141 
    142     @Override
    143     public void onStackTaskRemoved(TaskStack stack, Task removedTask, Task newFrontMostTask,
    144             AnimationProps animation, boolean fromDockGesture) {
    145         ((TaskStackHorizontalViewAdapter) getAdapter()).removeTask(removedTask);
    146         if (mFocusedTask == removedTask) {
    147             mFocusedTask = null;
    148         }
    149         // If there are no remaining tasks, then just close recents
    150         if (mStack.getStackTaskCount() == 0) {
    151             boolean shouldFinishActivity = (mStack.getStackTaskCount() == 0);
    152             if (shouldFinishActivity) {
    153                 EventBus.getDefault().send(new AllTaskViewsDismissedEvent(fromDockGesture
    154                         ? R.string.recents_empty_message
    155                         : R.string.recents_empty_message_dismissed_all));
    156             }
    157         }
    158     }
    159 
    160     @Override
    161     public void onStackTasksRemoved(TaskStack stack) {
    162         // Do nothing
    163     }
    164 
    165     @Override
    166     public void onStackTasksUpdated(TaskStack stack) {
    167         // Do nothing
    168     }
    169 }
    170