| /* |
| * Copyright (C) 2018 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 android.view; |
| |
| import android.content.Context; |
| import android.os.Build; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| /** |
| * Compatibility processor for InputEvents that allows events to be adjusted before and |
| * after it is sent to the application. |
| * |
| * {@hide} |
| */ |
| public class InputEventCompatProcessor { |
| |
| protected Context mContext; |
| protected int mTargetSdkVersion; |
| |
| /** List of events to be used to return the processed events */ |
| private List<InputEvent> mProcessedEvents; |
| |
| public InputEventCompatProcessor(Context context) { |
| mContext = context; |
| mTargetSdkVersion = context.getApplicationInfo().targetSdkVersion; |
| mProcessedEvents = new ArrayList<>(); |
| } |
| |
| /** |
| * Processes the InputEvent for compatibility before it is sent to the app, allowing for the |
| * generation of more than one event if necessary. |
| * |
| * @param e The InputEvent to process |
| * @return The list of adjusted events, or null if no adjustments are needed. Do not keep a |
| * reference to the output as the list is reused. |
| */ |
| public List<InputEvent> processInputEventForCompatibility(InputEvent e) { |
| if (mTargetSdkVersion < Build.VERSION_CODES.M && e instanceof MotionEvent) { |
| mProcessedEvents.clear(); |
| MotionEvent motion = (MotionEvent) e; |
| final int mask = |
| MotionEvent.BUTTON_STYLUS_PRIMARY | MotionEvent.BUTTON_STYLUS_SECONDARY; |
| final int buttonState = motion.getButtonState(); |
| final int compatButtonState = (buttonState & mask) >> 4; |
| if (compatButtonState != 0) { |
| motion.setButtonState(buttonState | compatButtonState); |
| } |
| mProcessedEvents.add(motion); |
| return mProcessedEvents; |
| } |
| return null; |
| } |
| |
| /** |
| * Processes the InputEvent for compatibility before it is finished by calling |
| * InputEventReceiver#finishInputEvent(). |
| * |
| * @param e The InputEvent to process |
| * @return The InputEvent to finish, or null if it should not be finished |
| */ |
| public InputEvent processInputEventBeforeFinish(InputEvent e) { |
| // No changes needed |
| return e; |
| } |
| } |