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/*
* Copyright (C) 2017 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.systemui.recents.views.grid;
import android.content.Context;
import android.graphics.Rect;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewTreeObserver.OnGlobalFocusChangeListener;
import com.android.systemui.R;
import com.android.systemui.shared.recents.model.TaskStack;
import com.android.systemui.recents.views.TaskStackView;
public class TaskViewFocusFrame extends View implements OnGlobalFocusChangeListener {
private TaskStackView mSv;
private TaskGridLayoutAlgorithm mTaskGridLayoutAlgorithm;
public TaskViewFocusFrame(Context context) {
this(context, null);
}
public TaskViewFocusFrame(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public TaskViewFocusFrame(Context context, AttributeSet attrs, int defStyleAttr) {
this(context, attrs, defStyleAttr, 0);
}
public TaskViewFocusFrame(Context context, AttributeSet attrs, int defStyleAttr,
int defStyleRes) {
super(context, attrs, defStyleAttr, defStyleRes);
setBackground(mContext.getDrawable(
R.drawable.recents_grid_task_view_focus_frame_background));
setFocusable(false);
hide();
}
public TaskViewFocusFrame(Context context, TaskStackView stackView,
TaskGridLayoutAlgorithm taskGridLayoutAlgorithm) {
this(context);
mSv = stackView;
mTaskGridLayoutAlgorithm = taskGridLayoutAlgorithm;
}
/**
* Measure the width and height of the focus frame according to the current grid task view size.
*/
public void measure() {
int thickness = mTaskGridLayoutAlgorithm.getFocusFrameThickness();
Rect rect = mTaskGridLayoutAlgorithm.getTaskGridRect();
measure(
MeasureSpec.makeMeasureSpec(rect.width() + thickness * 2, MeasureSpec.EXACTLY),
MeasureSpec.makeMeasureSpec(rect.height() + thickness * 2, MeasureSpec.EXACTLY));
}
/**
* Layout the focus frame with its size.
*/
public void layout() {
layout(0, 0, getMeasuredWidth(), getMeasuredHeight());
}
/**
* Update the current size of grid task view and the focus frame.
*/
public void resize() {
if (mSv.useGridLayout()) {
mTaskGridLayoutAlgorithm.updateTaskGridRect(mSv.getStack().getTaskCount());
measure();
requestLayout();
}
}
/**
* Move the task view focus frame to surround the newly focused view. If it's {@code null} or
* it's not an instance of GridTaskView, we hide the focus frame.
* @param newFocus The newly focused view.
*/
public void moveGridTaskViewFocus(View newFocus) {
if (mSv.useGridLayout()) {
// The frame only shows up in the grid layout. It shouldn't show up in the stack
// layout including when we're in the split screen.
if (newFocus instanceof GridTaskView) {
// If the focus goes to a GridTaskView, we show the frame and layout it.
int[] location = new int[2];
newFocus.getLocationInWindow(location);
int thickness = mTaskGridLayoutAlgorithm.getFocusFrameThickness();
setTranslationX(location[0] - thickness);
setTranslationY(location[1] - thickness);
show();
} else {
// If focus goes to other views, we hide the frame.
hide();
}
}
}
@Override
public void onGlobalFocusChanged(View oldFocus, View newFocus) {
if (!mSv.useGridLayout()) {
return;
}
if (newFocus == null) {
// We're going to touch mode, unset the focus.
moveGridTaskViewFocus(null);
return;
}
if (oldFocus == null) {
// We're returning from touch mode, set the focus to the previously focused task.
final TaskStack stack = mSv.getStack();
final int taskCount = stack.getTaskCount();
final int k = stack.indexOfStackTask(mSv.getFocusedTask());
final int taskIndexToFocus = k == -1 ? (taskCount - 1) : (k % taskCount);
mSv.setFocusedTask(taskIndexToFocus, false, true);
}
}
private void show() {
setAlpha(1f);
}
private void hide() {
setAlpha(0f);
}
}
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