| /* |
| * 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.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.indexOfTask(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); |
| } |
| } |