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/*
* 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;
}
}
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