1 files changed, 87 insertions, 0 deletions
diff --git a/services/core/java/com/android/server/wm/StackTapPointerEventListener.java b/services/core/java/com/android/server/wm/StackTapPointerEventListener.java
new file mode 100644
index 0000000..19d8ab3
--- /dev/null
+++ b/services/core/java/com/android/server/wm/StackTapPointerEventListener.java
@@ -0,0 +1,87 @@
+/*
+ * 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.view.DisplayInfo;
+import android.view.MotionEvent;
+import android.view.WindowManagerPolicy.PointerEventListener;
+
+import com.android.server.wm.WindowManagerService.H;
+
+public class StackTapPointerEventListener implements PointerEventListener {
+    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 StackTapPointerEventListener(WindowManagerService service,
+            DisplayContent displayContent) {
+        mService = service;
+        mDisplayContent = displayContent;
+        mTouchExcludeRegion = displayContent.mTouchExcludeRegion;
+        DisplayInfo info = displayContent.getDisplayInfo();
+        mMotionSlop = (int)(info.logicalDensityDpi * TAP_MOTION_SLOP_INCHES);
+    }
+
+    @Override
+    public void onPointerEvent(MotionEvent motionEvent) {
+        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);
+                    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;
+            }
+        }
+    }
+}