| /* |
| * 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.annotation.Nullable; |
| import android.content.Context; |
| import android.content.res.Configuration; |
| import android.hardware.display.DisplayManager; |
| import android.os.Handler; |
| import android.os.RemoteException; |
| import android.util.Slog; |
| import android.util.SparseArray; |
| import android.view.Display; |
| import android.view.IDisplayWindowListener; |
| import android.view.IWindowManager; |
| |
| import com.android.systemui.dagger.qualifiers.Main; |
| import com.android.systemui.wm.DisplayChangeController.OnDisplayChangingListener; |
| |
| import java.util.ArrayList; |
| |
| import javax.inject.Inject; |
| import javax.inject.Singleton; |
| |
| /** |
| * 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. |
| */ |
| @Singleton |
| public class DisplayController { |
| private static final String TAG = "DisplayController"; |
| |
| private final Handler mHandler; |
| private final Context mContext; |
| private final IWindowManager mWmService; |
| private final DisplayChangeController mChangeController; |
| |
| private final SparseArray<DisplayRecord> mDisplays = new SparseArray<>(); |
| private final ArrayList<OnDisplaysChangedListener> mDisplayChangedListeners = new ArrayList<>(); |
| |
| /** |
| * Get's a display by id from DisplayManager. |
| */ |
| public Display getDisplay(int displayId) { |
| final DisplayManager displayManager = mContext.getSystemService(DisplayManager.class); |
| return displayManager.getDisplay(displayId); |
| } |
| |
| private final IDisplayWindowListener mDisplayContainerListener = |
| new IDisplayWindowListener.Stub() { |
| @Override |
| public void onDisplayAdded(int displayId) { |
| mHandler.post(() -> { |
| synchronized (mDisplays) { |
| if (mDisplays.get(displayId) != null) { |
| return; |
| } |
| Display display = getDisplay(displayId); |
| if (display == null) { |
| // It's likely that the display is private to some app and thus not |
| // accessible by system-ui. |
| return; |
| } |
| DisplayRecord record = new DisplayRecord(); |
| record.mDisplayId = displayId; |
| record.mContext = (displayId == Display.DEFAULT_DISPLAY) ? mContext |
| : mContext.createDisplayContext(display); |
| record.mDisplayLayout = new DisplayLayout(record.mContext, display); |
| mDisplays.put(displayId, record); |
| for (int i = 0; i < mDisplayChangedListeners.size(); ++i) { |
| mDisplayChangedListeners.get(i).onDisplayAdded(displayId); |
| } |
| } |
| }); |
| } |
| |
| @Override |
| public void onDisplayConfigurationChanged(int displayId, Configuration newConfig) { |
| mHandler.post(() -> { |
| synchronized (mDisplays) { |
| DisplayRecord dr = mDisplays.get(displayId); |
| if (dr == null) { |
| Slog.w(TAG, "Skipping Display Configuration change on non-added" |
| + " display."); |
| return; |
| } |
| Display display = getDisplay(displayId); |
| Context perDisplayContext = mContext; |
| if (displayId != Display.DEFAULT_DISPLAY) { |
| perDisplayContext = mContext.createDisplayContext(display); |
| } |
| dr.mContext = perDisplayContext.createConfigurationContext(newConfig); |
| dr.mDisplayLayout = new DisplayLayout(dr.mContext, display); |
| for (int i = 0; i < mDisplayChangedListeners.size(); ++i) { |
| mDisplayChangedListeners.get(i).onDisplayConfigurationChanged( |
| displayId, newConfig); |
| } |
| } |
| }); |
| } |
| |
| @Override |
| public void onDisplayRemoved(int displayId) { |
| mHandler.post(() -> { |
| synchronized (mDisplays) { |
| if (mDisplays.get(displayId) == null) { |
| return; |
| } |
| for (int i = mDisplayChangedListeners.size() - 1; i >= 0; --i) { |
| mDisplayChangedListeners.get(i).onDisplayRemoved(displayId); |
| } |
| mDisplays.remove(displayId); |
| } |
| }); |
| } |
| }; |
| |
| @Inject |
| public DisplayController(Context context, @Main Handler mainHandler, |
| IWindowManager wmService) { |
| mHandler = mainHandler; |
| mContext = context; |
| mWmService = wmService; |
| mChangeController = new DisplayChangeController(mHandler, mWmService); |
| try { |
| mWmService.registerDisplayWindowListener(mDisplayContainerListener); |
| } catch (RemoteException e) { |
| throw new RuntimeException("Unable to register hierarchy listener"); |
| } |
| } |
| |
| /** |
| * Gets the DisplayLayout associated with a display. |
| */ |
| public @Nullable DisplayLayout getDisplayLayout(int displayId) { |
| final DisplayRecord r = mDisplays.get(displayId); |
| return r != null ? r.mDisplayLayout : null; |
| } |
| |
| /** |
| * Gets a display-specific context for a display. |
| */ |
| public @Nullable Context getDisplayContext(int displayId) { |
| final DisplayRecord r = mDisplays.get(displayId); |
| return r != null ? r.mContext : null; |
| } |
| |
| /** |
| * Add a display window-container listener. It will get notified whenever a display's |
| * configuration changes or when displays are added/removed from the WM hierarchy. |
| */ |
| public void addDisplayWindowListener(OnDisplaysChangedListener listener) { |
| synchronized (mDisplays) { |
| if (mDisplayChangedListeners.contains(listener)) { |
| return; |
| } |
| mDisplayChangedListeners.add(listener); |
| for (int i = 0; i < mDisplays.size(); ++i) { |
| listener.onDisplayAdded(mDisplays.keyAt(i)); |
| } |
| } |
| } |
| |
| /** |
| * Remove a display window-container listener. |
| */ |
| public void removeDisplayWindowListener(OnDisplaysChangedListener listener) { |
| synchronized (mDisplays) { |
| mDisplayChangedListeners.remove(listener); |
| } |
| } |
| |
| /** |
| * Adds a display rotation controller. |
| */ |
| public void addDisplayChangingController(OnDisplayChangingListener controller) { |
| mChangeController.addRotationListener(controller); |
| } |
| |
| /** |
| * Removes a display rotation controller. |
| */ |
| public void removeDisplayChangingController(OnDisplayChangingListener controller) { |
| mChangeController.removeRotationListener(controller); |
| } |
| |
| private static class DisplayRecord { |
| int mDisplayId; |
| Context mContext; |
| DisplayLayout mDisplayLayout; |
| } |
| |
| /** |
| * Gets notified when a display is added/removed to the WM hierarchy and when a display's |
| * window-configuration changes. |
| * |
| * @see IDisplayWindowListener |
| */ |
| public interface OnDisplaysChangedListener { |
| /** |
| * Called when a display has been added to the WM hierarchy. |
| */ |
| default void onDisplayAdded(int displayId) {} |
| |
| /** |
| * Called when a display's window-container configuration changes. |
| */ |
| default void onDisplayConfigurationChanged(int displayId, Configuration newConfig) {} |
| |
| /** |
| * Called when a display is removed. |
| */ |
| default void onDisplayRemoved(int displayId) {} |
| } |
| } |