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 17 package androidx.window.sidecar; 18 19 import android.os.IBinder; 20 21 import androidx.annotation.NonNull; 22 23 import java.util.HashSet; 24 import java.util.Set; 25 26 /** 27 * Basic implementation of the {@link SidecarInterface}. An OEM can choose to use it as the base 28 * class for their implementation. 29 */ 30 abstract class StubSidecar implements SidecarInterface { 31 32 private SidecarCallback mSidecarCallback; 33 private final Set<IBinder> mWindowLayoutChangeListenerTokens = new HashSet<>(); 34 private boolean mDeviceStateChangeListenerRegistered; 35 StubSidecar()36 StubSidecar() { 37 } 38 39 @Override setSidecarCallback(@onNull SidecarCallback sidecarCallback)40 public void setSidecarCallback(@NonNull SidecarCallback sidecarCallback) { 41 this.mSidecarCallback = sidecarCallback; 42 } 43 44 @Override onWindowLayoutChangeListenerAdded(@onNull IBinder iBinder)45 public void onWindowLayoutChangeListenerAdded(@NonNull IBinder iBinder) { 46 this.mWindowLayoutChangeListenerTokens.add(iBinder); 47 this.onListenersChanged(); 48 } 49 50 @Override onWindowLayoutChangeListenerRemoved(@onNull IBinder iBinder)51 public void onWindowLayoutChangeListenerRemoved(@NonNull IBinder iBinder) { 52 this.mWindowLayoutChangeListenerTokens.remove(iBinder); 53 this.onListenersChanged(); 54 } 55 56 @Override onDeviceStateListenersChanged(boolean isEmpty)57 public void onDeviceStateListenersChanged(boolean isEmpty) { 58 this.mDeviceStateChangeListenerRegistered = !isEmpty; 59 this.onListenersChanged(); 60 } 61 updateDeviceState(SidecarDeviceState newState)62 void updateDeviceState(SidecarDeviceState newState) { 63 if (this.mSidecarCallback != null) { 64 mSidecarCallback.onDeviceStateChanged(newState); 65 } 66 } 67 updateWindowLayout(@onNull IBinder windowToken, @NonNull SidecarWindowLayoutInfo newLayout)68 void updateWindowLayout(@NonNull IBinder windowToken, 69 @NonNull SidecarWindowLayoutInfo newLayout) { 70 if (this.mSidecarCallback != null) { 71 mSidecarCallback.onWindowLayoutChanged(windowToken, newLayout); 72 } 73 } 74 75 @NonNull getWindowsListeningForLayoutChanges()76 Set<IBinder> getWindowsListeningForLayoutChanges() { 77 return mWindowLayoutChangeListenerTokens; 78 } 79 hasListeners()80 protected boolean hasListeners() { 81 return !mWindowLayoutChangeListenerTokens.isEmpty() || mDeviceStateChangeListenerRegistered; 82 } 83 onListenersChanged()84 protected abstract void onListenersChanged(); 85 } 86