Generate tap gesture with tap_count = 3 for triple-tap

ui/base/gestures/gesture_point.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_BASE_GESTURES_GESTURE_POINT_H_
 #define UI_BASE_GESTURES_GESTURE_POINT_H_
 
 #include "base/basictypes.h"
 #include "ui/base/gestures/velocity_calculator.h"
 #include "ui/gfx/point.h"
@@ skipping 21 matching lines @@
   // point.
   void UpdateForScroll();
 
   // Updates states depending on the event and the gesture-state.
   void UpdateValues(const TouchEvent& event);
 
   // Responds according to the state of the gesture point (i.e. the point can
   // represent a click or scroll etc.)
   bool IsInClickWindow(const TouchEvent& event) const;
   bool IsInDoubleClickWindow(const TouchEvent& event) const;
+  bool IsInTripleClickWindow(const TouchEvent& event) const;
   bool IsInScrollWindow(const TouchEvent& event) const;
   bool IsInFlickWindow(const TouchEvent& event);
   bool IsInHorizontalRailWindow() const;
   bool IsInVerticalRailWindow() const;
   bool IsInsideManhattanSquare(const TouchEvent& event) const;
   bool BreaksHorizontalRail();
   bool BreaksVerticalRail();
   bool DidScroll(const TouchEvent& event, int distance) const;
 
   const gfx::Point& first_touch_position() const {
@@ skipping 27 matching lines @@
   const gfx::Rect& enclosing_rectangle() const { return enclosing_rect_; }
 
   // Tests if the point has a consistent scroll vector across a window of touch
   // move events.
   bool IsConsistentScrollingActionUnderway();
 
  private:
   // Various statistical functions to manipulate gestures.
   bool IsInClickTimeWindow() const;
   bool IsInSecondClickTimeWindow() const;
+  bool IsInThirdClickTimeWindow() const;
   bool IsSecondClickInsideManhattanSquare(const TouchEvent& event) const;
+  bool IsThirdClickInsideManhattanSquare(const TouchEvent& event) const;
   bool IsOverMinFlickSpeed();
 
   // Returns -1, 0, 1 for |v| below the negative velocity threshold,
   // in [-threshold, threshold] or above respectively.
   int ScrollVelocityDirection(float v);
 
   // The enclosing rectangle represents a rectangular touch region generated
   // by a sequence of ET_TOUCH_PRESSED, ET_TOUCH_MOVED, and ET_TOUCH_RELEASED
   // events forming a GESTURE_TAP event. The enclosing rectangle is updated
   // to be the union of the touch data from each of these events. It is
   // cleared on a ET_TOUCH_PRESSED event (i.e., at the beginning of a possible
   // GESTURE_TAP event) or when Reset is called.
   void UpdateEnclosingRectangle(const TouchEvent& event);
   void clear_enclosing_rectangle() { enclosing_rect_ = gfx::Rect(); }
 
   // The position of the first touchdown event.
   gfx::Point first_touch_position_;
   double first_touch_time_;
 
   gfx::Point second_last_touch_position_;
   double second_last_touch_time_;
 
   gfx::Point last_touch_position_;
   double last_touch_time_;
 
+  double second_last_tap_time_;
+  gfx::Point second_last_tap_position_;
+
   double last_tap_time_;
   gfx::Point last_tap_position_;
 
   VelocityCalculator velocity_calculator_;
 
   int point_id_;
   int touch_id_;
 
   // Represents the rectangle that encloses the circles/ellipses
   // generated by a sequence of touch events
   gfx::Rect enclosing_rect_;
 
   // Count of the number of events with same direction.
   gfx::Vector2d same_direction_count_;
 
   DISALLOW_COPY_AND_ASSIGN(GesturePoint);
 };
 
 }  // namespace ui
 
 #endif  // UI_BASE_GESTURES_GESTURE_POINT_H_