| /* |
| * Copyright (C) 2019 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.wm; |
| |
| import android.os.Handler; |
| import android.os.RemoteException; |
| import android.view.IDisplayWindowRotationCallback; |
| import android.view.IDisplayWindowRotationController; |
| import android.view.IWindowManager; |
| import android.view.WindowContainerTransaction; |
| |
| import java.util.ArrayList; |
| |
| /** |
| * This module deals with display rotations coming from WM. When WM starts a rotation: after it has |
| * frozen the screen, it will call into this class. This will then call all registered local |
| * controllers and give them a chance to queue up task changes to be applied synchronously with that |
| * rotation. |
| */ |
| public class DisplayChangeController { |
| |
| private final Handler mHandler; |
| private final IWindowManager mWmService; |
| |
| private final ArrayList<OnDisplayChangingListener> mRotationListener = |
| new ArrayList<>(); |
| private final ArrayList<OnDisplayChangingListener> mTmpListeners = new ArrayList<>(); |
| |
| private final IDisplayWindowRotationController mDisplayRotationController = |
| new IDisplayWindowRotationController.Stub() { |
| @Override |
| public void onRotateDisplay(int displayId, final int fromRotation, |
| final int toRotation, IDisplayWindowRotationCallback callback) { |
| mHandler.post(() -> { |
| WindowContainerTransaction t = new WindowContainerTransaction(); |
| synchronized (mRotationListener) { |
| mTmpListeners.clear(); |
| // Make a local copy in case the handlers add/remove themselves. |
| mTmpListeners.addAll(mRotationListener); |
| } |
| for (OnDisplayChangingListener c : mTmpListeners) { |
| c.onRotateDisplay(displayId, fromRotation, toRotation, t); |
| } |
| try { |
| callback.continueRotateDisplay(toRotation, t); |
| } catch (RemoteException e) { |
| } |
| }); |
| } |
| }; |
| |
| public DisplayChangeController(Handler mainHandler, IWindowManager wmService) { |
| mHandler = mainHandler; |
| mWmService = wmService; |
| try { |
| mWmService.setDisplayWindowRotationController(mDisplayRotationController); |
| } catch (RemoteException e) { |
| throw new RuntimeException("Unable to register rotation controller"); |
| } |
| } |
| |
| /** |
| * Adds a display rotation controller. |
| */ |
| public void addRotationListener(OnDisplayChangingListener listener) { |
| synchronized (mRotationListener) { |
| mRotationListener.add(listener); |
| } |
| } |
| |
| /** |
| * Removes a display rotation controller. |
| */ |
| public void removeRotationListener(OnDisplayChangingListener listener) { |
| synchronized (mRotationListener) { |
| mRotationListener.remove(listener); |
| } |
| } |
| |
| /** |
| * Give a listener a chance to queue up configuration changes to execute as part of a |
| * display rotation. The contents of {@link #onRotateDisplay} must run synchronously. |
| */ |
| public interface OnDisplayChangingListener { |
| /** |
| * Called before the display is rotated. Contents of this method must run synchronously. |
| * @param displayId Id of display that is rotating. |
| * @param fromRotation starting rotation of the display. |
| * @param toRotation target rotation of the display (after rotating). |
| * @param t A task transaction to populate. |
| */ |
| void onRotateDisplay(int displayId, int fromRotation, int toRotation, |
| WindowContainerTransaction t); |
| } |
| } |