1 /* 2 * Copyright (C) 2024 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.wm.shell.shared; 18 19 import com.android.wm.shell.shared.annotations.ExternalThread; 20 21 /** 22 * Listener to get focus-related transition callbacks. 23 */ 24 @ExternalThread 25 public interface FocusTransitionListener { 26 /** 27 * Called when a transition changes the top, focused display. 28 */ onFocusedDisplayChanged(int displayId)29 default void onFocusedDisplayChanged(int displayId) {} 30 31 /** 32 * Called when the per-app or system-wide focus state has changed for a task. 33 */ onFocusedTaskChanged(int taskId, boolean isFocusedOnDisplay, boolean isFocusedGlobally)34 default void onFocusedTaskChanged(int taskId, boolean isFocusedOnDisplay, 35 boolean isFocusedGlobally) {} 36 } 37