Generate tap gesture with tap_count = 3 for triple-tap

ui/base/gestures/gesture_point.cc

Index: ui/base/gestures/gesture_point.cc
diff --git a/ui/base/gestures/gesture_point.cc b/ui/base/gestures/gesture_point.cc
index 765ffd98c01e58081183b595a0d065e71844377e..5e6c52fcd73660f1722effff7b5c5961dc3f7e4d 100644
--- a/ui/base/gestures/gesture_point.cc
+++ b/ui/base/gestures/gesture_point.cc
@@ -19,6 +19,7 @@ GesturePoint::GesturePoint()
     : first_touch_time_(0.0),
       second_last_touch_time_(0.0),
       last_touch_time_(0.0),
+      second_last_tap_time_(0.0),
       last_tap_time_(0.0),
       velocity_calculator_(
           GestureConfiguration::points_buffered_for_velocity()),
@@ -76,6 +77,8 @@ void GesturePoint::UpdateValues(const TouchEvent& event) {
 
 void GesturePoint::UpdateForTap() {
   // Update the tap-position and time, and reset every other state.
+  second_last_tap_position_ = last_tap_position_;
+  second_last_tap_time_ = last_tap_time_;
   last_tap_time_ = last_touch_time_;
   last_tap_position_ = last_touch_position_;
 }
@@ -95,6 +98,11 @@ bool GesturePoint::IsInDoubleClickWindow(const TouchEvent& event) const {
          IsSecondClickInsideManhattanSquare(event);
 }
 
+bool GesturePoint::IsInTripleClickWindow(const TouchEvent& event) const {
+  return IsInThirdClickTimeWindow() &&
+         IsThirdClickInsideManhattanSquare(event);
+}
+
 bool GesturePoint::IsInScrollWindow(const TouchEvent& event) const {
   return event.type() == ui::ET_TOUCH_MOVED &&
          !IsInsideManhattanSquare(event);
@@ -166,6 +174,13 @@ bool GesturePoint::IsInSecondClickTimeWindow() const {
   return duration < GestureConfiguration::max_seconds_between_double_click();
 }
 
+bool GesturePoint::IsInThirdClickTimeWindow() const {
+  double duration1 =  last_touch_time_ - last_tap_time_;
+  double duration2 =  last_tap_time_ - second_last_tap_time_;
+  return duration1 < GestureConfiguration::max_seconds_between_double_click() &&
+      duration2 < GestureConfiguration::max_seconds_between_double_click();
+}
+

[sadrul, 2013/05/28 17:48:46]

Refactor IsInSecondClickTimeWindow and IsInThirdClickTimeWindow into one
function:

  IsInClickAggregateTimeWindow(double before, double after)

[Yufeng Shen (Slow to review), 2013/05/28 19:31:44]

Done.

 bool GesturePoint::IsInsideManhattanSquare(const TouchEvent& event) const {
   return ui::gestures::IsInsideManhattanSquare(event.location(),
                                                first_touch_position_);
@@ -179,6 +194,21 @@ bool GesturePoint::IsSecondClickInsideManhattanSquare(
       GestureConfiguration::max_distance_between_taps_for_double_tap();
 }
 
+bool GesturePoint::IsThirdClickInsideManhattanSquare(
+    const TouchEvent& event) const {
+  int manhattan_distance1 =
+      abs(event.location().x() - last_tap_position_.x()) +
+      abs(event.location().y() - last_tap_position_.y());
+  int manhattan_distance2 =
+      abs(last_tap_position_.x() - second_last_tap_position_.x()) +
+      abs(last_tap_position_.y() - second_last_tap_position_.y());
+
+  return manhattan_distance1 <
+      GestureConfiguration::max_distance_between_taps_for_double_tap() &&
+      manhattan_distance2 <
+      GestureConfiguration::max_distance_between_taps_for_double_tap();
+}
+

[sadrul, 2013/05/28 17:48:46]

Similarly,

 IsLocationsInsideManhattanSquare(point 1, point 2)

[Yufeng Shen (Slow to review), 2013/05/28 19:31:44]

Done.

 bool GesturePoint::IsOverMinFlickSpeed() {
   return velocity_calculator_.VelocitySquared() >
       GestureConfiguration::min_flick_speed_squared();