1 /* 2 * Copyright (C) 2020 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.quickstep.util; 17 18 import static android.view.Surface.ROTATION_0; 19 import static android.view.Surface.ROTATION_180; 20 21 import android.annotation.TargetApi; 22 import android.content.Context; 23 import android.graphics.Insets; 24 import android.graphics.Rect; 25 import android.os.Build; 26 import android.view.WindowInsets.Type; 27 import android.view.WindowManager; 28 import android.view.WindowMetrics; 29 30 import androidx.annotation.NonNull; 31 import androidx.annotation.Nullable; 32 import androidx.annotation.UiThread; 33 34 import com.android.launcher3.R; 35 import com.android.launcher3.util.DefaultDisplay; 36 import com.android.launcher3.util.WindowBounds; 37 38 import java.util.ArrayList; 39 40 /** 41 * Utility class to hold the information abound a window bounds for split screen 42 */ 43 @TargetApi(Build.VERSION_CODES.R) 44 public class SplitScreenBounds { 45 46 public static final SplitScreenBounds INSTANCE = new SplitScreenBounds(); 47 private final ArrayList<OnChangeListener> mListeners = new ArrayList<>(); 48 49 @Nullable 50 private WindowBounds mBounds; 51 SplitScreenBounds()52 private SplitScreenBounds() { } 53 54 @UiThread setSecondaryWindowBounds(@onNull WindowBounds bounds)55 public void setSecondaryWindowBounds(@NonNull WindowBounds bounds) { 56 if (!bounds.equals(mBounds)) { 57 mBounds = bounds; 58 for (OnChangeListener listener : mListeners) { 59 listener.onSecondaryWindowBoundsChanged(); 60 } 61 } 62 } 63 getSecondaryWindowBounds(Context context)64 public @NonNull WindowBounds getSecondaryWindowBounds(Context context) { 65 if (mBounds == null) { 66 mBounds = createDefaultWindowBounds(context); 67 } 68 return mBounds; 69 } 70 71 /** 72 * Creates window bounds as 50% of device size 73 */ createDefaultWindowBounds(Context context)74 private static WindowBounds createDefaultWindowBounds(Context context) { 75 WindowMetrics wm = context.getSystemService(WindowManager.class).getMaximumWindowMetrics(); 76 Insets insets = wm.getWindowInsets().getInsets(Type.systemBars()); 77 78 WindowBounds bounds = new WindowBounds(wm.getBounds(), 79 new Rect(insets.left, insets.top, insets.right, insets.bottom)); 80 int rotation = DefaultDisplay.INSTANCE.get(context).getInfo().rotation; 81 int halfDividerSize = context.getResources() 82 .getDimensionPixelSize(R.dimen.multi_window_task_divider_size) / 2; 83 84 if (rotation == ROTATION_0 || rotation == ROTATION_180) { 85 bounds.bounds.top = bounds.insets.top + bounds.availableSize.y / 2 + halfDividerSize; 86 bounds.insets.top = 0; 87 } else { 88 bounds.bounds.left = bounds.insets.left + bounds.availableSize.x / 2 + halfDividerSize; 89 bounds.insets.left = 0; 90 } 91 return new WindowBounds(bounds.bounds, bounds.insets); 92 } 93 addOnChangeListener(OnChangeListener listener)94 public void addOnChangeListener(OnChangeListener listener) { 95 mListeners.add(listener); 96 } 97 removeOnChangeListener(OnChangeListener listener)98 public void removeOnChangeListener(OnChangeListener listener) { 99 mListeners.remove(listener); 100 } 101 102 /** 103 * Interface to receive window bounds changes 104 */ 105 public interface OnChangeListener { 106 107 /** 108 * Called when window bounds for secondary window changes 109 */ onSecondaryWindowBoundsChanged()110 void onSecondaryWindowBoundsChanged(); 111 } 112 } 113