| /* |
| * Copyright (C) 2022 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.dreams.touch; |
| |
| import static com.android.systemui.dreams.touch.dagger.DreamTouchModule.INPUT_SESSION_NAME; |
| import static com.android.systemui.dreams.touch.dagger.DreamTouchModule.PILFER_ON_GESTURE_CONSUME; |
| |
| import android.os.Looper; |
| import android.view.Choreographer; |
| import android.view.GestureDetector; |
| import android.view.MotionEvent; |
| |
| import com.android.systemui.settings.DisplayTracker; |
| import com.android.systemui.shared.system.InputChannelCompat; |
| import com.android.systemui.shared.system.InputMonitorCompat; |
| |
| import javax.inject.Inject; |
| import javax.inject.Named; |
| |
| /** |
| * {@link InputSession} encapsulates components behind input monitoring and handles their lifecycle. |
| * Sessions are meant to be disposable; actions such as exclusively capturing touch events is modal |
| * and destroying the sessions allows a reset. Additionally, {@link InputSession} is meant to have |
| * a single listener for input and gesture. Any broadcasting must be accomplished elsewhere. |
| */ |
| public class InputSession { |
| private final InputMonitorCompat mInputMonitor; |
| private final InputChannelCompat.InputEventReceiver mInputEventReceiver; |
| private final GestureDetector mGestureDetector; |
| |
| /** |
| * Default session constructor. |
| * @param sessionName The session name that will be applied to the underlying |
| * {@link InputMonitorCompat}. |
| * @param inputEventListener A listener to receive input events. |
| * @param gestureListener A listener to receive gesture events. |
| * @param pilferOnGestureConsume Whether touch events should be pilfered after a gesture has |
| * been consumed. |
| */ |
| @Inject |
| public InputSession(@Named(INPUT_SESSION_NAME) String sessionName, |
| InputChannelCompat.InputEventListener inputEventListener, |
| GestureDetector.OnGestureListener gestureListener, |
| DisplayTracker displayTracker, |
| @Named(PILFER_ON_GESTURE_CONSUME) boolean pilferOnGestureConsume) { |
| mInputMonitor = new InputMonitorCompat(sessionName, displayTracker.getDefaultDisplayId()); |
| mGestureDetector = new GestureDetector(gestureListener); |
| |
| mInputEventReceiver = mInputMonitor.getInputReceiver(Looper.getMainLooper(), |
| Choreographer.getInstance(), |
| ev -> { |
| // Process event. Since sometimes input may be a prerequisite for some |
| // gesture logic, process input first. |
| inputEventListener.onInputEvent(ev); |
| |
| if (ev instanceof MotionEvent |
| && mGestureDetector.onTouchEvent((MotionEvent) ev) |
| && pilferOnGestureConsume) { |
| mInputMonitor.pilferPointers(); |
| } |
| }); |
| } |
| |
| /** |
| * Destroys the {@link InputSession}, removing any component from listening to future touch |
| * events. |
| */ |
| public void dispose() { |
| if (mInputEventReceiver != null) { |
| mInputEventReceiver.dispose(); |
| } |
| |
| if (mInputMonitor != null) { |
| mInputMonitor.dispose(); |
| } |
| } |
| } |