1 /** 2 * Copyright (C) 2019 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 android.view; 18 19 import android.view.IDisplayChangeWindowCallback; 20 import android.window.DisplayAreaInfo; 21 22 /** 23 * Singular controller of a "remote" display change. When a display rotation or change is started, 24 * WM freezes the screen. It will then call into this controller and wait for a response via the 25 * callback. 26 * 27 * This needs to provide configuration changes because those changes need to be applied in sync 28 * with the actual display rotation to prevent relayouts with mismatched information. 29 * 30 * The flow is like this: 31 * 1. DisplayContent/Rotation freezes the screen 32 * 2. This controller is notified of a rotation and provided a callback. 33 * 3. This controller is responsible for collecting a set of configuration changes to go along with 34 * the rotation. 35 * 4. The callback is fired which tells DisplayContent/Rotation to apply the provided configuration 36 * changes and continue the rotation. 37 * 38 * @hide 39 */ 40 oneway interface IDisplayChangeWindowController { 41 42 /** 43 * Called when WM needs to know how to update tasks in response to a display change. 44 * If this isn't called, a timeout will continue the change in WM. 45 * 46 * @param fromRotation the old rotation 47 * @param newRotation the new rotation 48 * @param newDisplayAreaInfo the new display area info after the change 49 * @param callback A callback to be called when this has calculated updated configs. 50 */ onDisplayChange(int displayId, int fromRotation, int toRotation, in DisplayAreaInfo newDisplayAreaInfo, in IDisplayChangeWindowCallback callback)51 void onDisplayChange(int displayId, int fromRotation, int toRotation, 52 in DisplayAreaInfo newDisplayAreaInfo, in IDisplayChangeWindowCallback callback); 53 54 } 55