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/*
* Copyright (C) 2013 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.server.wm;
import android.graphics.Region;
import android.os.Looper;
import android.view.DisplayInfo;
import android.view.InputChannel;
import android.view.InputDevice;
import android.view.InputEvent;
import android.view.InputEventReceiver;
import android.view.MotionEvent;
import com.android.server.wm.WindowManagerService.H;
public class StackTapDetector extends InputEventReceiver {
private static final int TAP_TIMEOUT_MSEC = 300;
private static final float TAP_MOTION_SLOP_INCHES = 0.125f;
private final int mMotionSlop;
private float mDownX;
private float mDownY;
private int mPointerId;
final private Region mTouchExcludeRegion;
private final WindowManagerService mService;
private final DisplayContent mDisplayContent;
public StackTapDetector(WindowManagerService service, DisplayContent displayContent,
InputChannel inputChannel, Looper looper) {
super(inputChannel, looper);
mService = service;
mDisplayContent = displayContent;
mTouchExcludeRegion = displayContent.mTouchExcludeRegion;
DisplayInfo info = displayContent.getDisplayInfo();
mMotionSlop = (int)(info.logicalDensityDpi * TAP_MOTION_SLOP_INCHES);
}
@Override
public void onInputEvent(InputEvent event) {
try {
if (!(event instanceof MotionEvent)
|| !event.isFromSource(InputDevice.SOURCE_CLASS_POINTER)) {
return;
}
final MotionEvent motionEvent = (MotionEvent)event;
final int action = motionEvent.getAction();
switch (action & MotionEvent.ACTION_MASK) {
case MotionEvent.ACTION_DOWN:
mPointerId = motionEvent.getPointerId(0);
mDownX = motionEvent.getX();
mDownY = motionEvent.getY();
break;
case MotionEvent.ACTION_MOVE:
if (mPointerId >= 0) {
int index = motionEvent.findPointerIndex(mPointerId);
if ((motionEvent.getEventTime() - motionEvent.getDownTime())
> TAP_TIMEOUT_MSEC
|| (motionEvent.getX(index) - mDownX) > mMotionSlop
|| (motionEvent.getY(index) - mDownY) > mMotionSlop) {
mPointerId = -1;
}
}
break;
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_POINTER_UP: {
int index = (action & MotionEvent.ACTION_POINTER_INDEX_MASK)
>> MotionEvent.ACTION_POINTER_INDEX_SHIFT;
// Extract the index of the pointer that left the touch sensor
if (mPointerId == motionEvent.getPointerId(index)) {
final int x = (int)motionEvent.getX(index);
final int y = (int)motionEvent.getY(index);
synchronized (this) {
if ((motionEvent.getEventTime() - motionEvent.getDownTime())
< TAP_TIMEOUT_MSEC
&& (x - mDownX) < mMotionSlop && (y - mDownY) < mMotionSlop
&& !mTouchExcludeRegion.contains(x, y)) {
mService.mH.obtainMessage(H.TAP_OUTSIDE_STACK, x, y,
mDisplayContent).sendToTarget();
}
}
mPointerId = -1;
}
break;
}
}
} finally {
finishInputEvent(event, false /*ignored for monitors*/);
}
}
}
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