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      1 /*
      2  * Copyright (C) 2017 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.grid;
     18 
     19 import android.content.Context;
     20 import android.graphics.Rect;
     21 import android.util.AttributeSet;
     22 import android.view.View;
     23 
     24 import android.view.ViewTreeObserver.OnGlobalFocusChangeListener;
     25 import com.android.systemui.R;
     26 import com.android.systemui.recents.model.TaskStack;
     27 import com.android.systemui.recents.views.TaskStackView;
     28 
     29 public class TaskViewFocusFrame extends View implements OnGlobalFocusChangeListener {
     30 
     31     private TaskStackView mSv;
     32     private TaskGridLayoutAlgorithm mTaskGridLayoutAlgorithm;
     33     public TaskViewFocusFrame(Context context) {
     34         this(context, null);
     35     }
     36 
     37     public TaskViewFocusFrame(Context context, AttributeSet attrs) {
     38         this(context, attrs, 0);
     39     }
     40 
     41     public TaskViewFocusFrame(Context context, AttributeSet attrs, int defStyleAttr) {
     42         this(context, attrs, defStyleAttr, 0);
     43     }
     44 
     45     public TaskViewFocusFrame(Context context, AttributeSet attrs, int defStyleAttr,
     46         int defStyleRes) {
     47         super(context, attrs, defStyleAttr, defStyleRes);
     48         setBackground(mContext.getDrawable(
     49             R.drawable.recents_grid_task_view_focus_frame_background));
     50         setFocusable(false);
     51         hide();
     52     }
     53 
     54     public TaskViewFocusFrame(Context context, TaskStackView stackView,
     55         TaskGridLayoutAlgorithm taskGridLayoutAlgorithm) {
     56         this(context);
     57         mSv = stackView;
     58         mTaskGridLayoutAlgorithm = taskGridLayoutAlgorithm;
     59     }
     60 
     61     /**
     62      * Measure the width and height of the focus frame according to the current grid task view size.
     63      */
     64     public void measure() {
     65         int thickness = mTaskGridLayoutAlgorithm.getFocusFrameThickness();
     66         Rect rect = mTaskGridLayoutAlgorithm.getTaskGridRect();
     67         measure(
     68             MeasureSpec.makeMeasureSpec(rect.width() + thickness * 2, MeasureSpec.EXACTLY),
     69             MeasureSpec.makeMeasureSpec(rect.height() + thickness * 2, MeasureSpec.EXACTLY));
     70     }
     71 
     72     /**
     73      * Layout the focus frame with its size.
     74      */
     75     public void layout() {
     76         layout(0, 0, getMeasuredWidth(), getMeasuredHeight());
     77     }
     78 
     79     /**
     80      * Update the current size of grid task view and the focus frame.
     81      */
     82     public void resize() {
     83         if (mSv.useGridLayout()) {
     84             mTaskGridLayoutAlgorithm.updateTaskGridRect(mSv.getStack().getTaskCount());
     85             measure();
     86             requestLayout();
     87         }
     88     }
     89 
     90     /**
     91      * Move the task view focus frame to surround the newly focused view. If it's {@code null} or
     92      * it's not an instance of GridTaskView, we hide the focus frame.
     93      * @param newFocus The newly focused view.
     94      */
     95     public void moveGridTaskViewFocus(View newFocus) {
     96         if (mSv.useGridLayout()) {
     97             // The frame only shows up in the grid layout. It shouldn't show up in the stack
     98             // layout including when we're in the split screen.
     99             if (newFocus instanceof GridTaskView) {
    100                 // If the focus goes to a GridTaskView, we show the frame and layout it.
    101                 int[] location = new int[2];
    102                 newFocus.getLocationInWindow(location);
    103                 int thickness = mTaskGridLayoutAlgorithm.getFocusFrameThickness();
    104                 setTranslationX(location[0] - thickness);
    105                 setTranslationY(location[1] - thickness);
    106                 show();
    107             } else {
    108                 // If focus goes to other views, we hide the frame.
    109                 hide();
    110             }
    111         }
    112     }
    113 
    114     @Override
    115     public void onGlobalFocusChanged(View oldFocus, View newFocus) {
    116         if (!mSv.useGridLayout()) {
    117             return;
    118         }
    119         if (newFocus == null) {
    120             // We're going to touch mode, unset the focus.
    121             moveGridTaskViewFocus(null);
    122             return;
    123         }
    124         if (oldFocus == null) {
    125             // We're returning from touch mode, set the focus to the previously focused task.
    126             final TaskStack stack = mSv.getStack();
    127             final int taskCount = stack.getTaskCount();
    128             final int k = stack.indexOfStackTask(mSv.getFocusedTask());
    129             final int taskIndexToFocus = k == -1 ? (taskCount - 1) : (k % taskCount);
    130             mSv.setFocusedTask(taskIndexToFocus, false, true);
    131         }
    132     }
    133 
    134     private void show() {
    135         setAlpha(1f);
    136     }
    137 
    138     private void hide() {
    139         setAlpha(0f);
    140     }
    141 }
    142