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      1 /*
      2  * Copyright (C) 2013 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.android.server.wm;
     18 
     19 import android.graphics.Region;
     20 import android.view.DisplayInfo;
     21 import android.view.MotionEvent;
     22 import android.view.WindowManagerPolicy.PointerEventListener;
     23 
     24 import com.android.server.wm.WindowManagerService.H;
     25 
     26 public class StackTapPointerEventListener implements PointerEventListener {
     27     private static final int TAP_TIMEOUT_MSEC = 300;
     28     private static final float TAP_MOTION_SLOP_INCHES = 0.125f;
     29 
     30     private final int mMotionSlop;
     31     private float mDownX;
     32     private float mDownY;
     33     private int mPointerId;
     34     final private Region mTouchExcludeRegion;
     35     private final WindowManagerService mService;
     36     private final DisplayContent mDisplayContent;
     37 
     38     public StackTapPointerEventListener(WindowManagerService service,
     39             DisplayContent displayContent) {
     40         mService = service;
     41         mDisplayContent = displayContent;
     42         mTouchExcludeRegion = displayContent.mTouchExcludeRegion;
     43         DisplayInfo info = displayContent.getDisplayInfo();
     44         mMotionSlop = (int)(info.logicalDensityDpi * TAP_MOTION_SLOP_INCHES);
     45     }
     46 
     47     @Override
     48     public void onPointerEvent(MotionEvent motionEvent) {
     49         final int action = motionEvent.getAction();
     50         switch (action & MotionEvent.ACTION_MASK) {
     51             case MotionEvent.ACTION_DOWN:
     52                 mPointerId = motionEvent.getPointerId(0);
     53                 mDownX = motionEvent.getX();
     54                 mDownY = motionEvent.getY();
     55                 break;
     56             case MotionEvent.ACTION_MOVE:
     57                 if (mPointerId >= 0) {
     58                     int index = motionEvent.findPointerIndex(mPointerId);
     59                     if ((motionEvent.getEventTime() - motionEvent.getDownTime()) > TAP_TIMEOUT_MSEC
     60                             || (motionEvent.getX(index) - mDownX) > mMotionSlop
     61                             || (motionEvent.getY(index) - mDownY) > mMotionSlop) {
     62                         mPointerId = -1;
     63                     }
     64                 }
     65                 break;
     66             case MotionEvent.ACTION_UP:
     67             case MotionEvent.ACTION_POINTER_UP: {
     68                 int index = (action & MotionEvent.ACTION_POINTER_INDEX_MASK)
     69                         >> MotionEvent.ACTION_POINTER_INDEX_SHIFT;
     70                 // Extract the index of the pointer that left the touch sensor
     71                 if (mPointerId == motionEvent.getPointerId(index)) {
     72                     final int x = (int)motionEvent.getX(index);
     73                     final int y = (int)motionEvent.getY(index);
     74                     if ((motionEvent.getEventTime() - motionEvent.getDownTime())
     75                             < TAP_TIMEOUT_MSEC
     76                             && (x - mDownX) < mMotionSlop && (y - mDownY) < mMotionSlop
     77                             && !mTouchExcludeRegion.contains(x, y)) {
     78                         mService.mH.obtainMessage(H.TAP_OUTSIDE_STACK, x, y,
     79                                 mDisplayContent).sendToTarget();
     80                     }
     81                     mPointerId = -1;
     82                 }
     83                 break;
     84             }
     85         }
     86     }
     87 }
     88