gesture recognizer: Expose bounding-box for the points in a gesture-event.

ui/base/gestures/gesture_types.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_TYPES_H_
 #define UI_BASE_GESTURES_GESTURE_TYPES_H_
 
 #include "base/logging.h"
 #include "base/time.h"
 #include "ui/base/events.h"
+#include "ui/gfx/rect.h"
 
 namespace ui {
 
 struct UI_EXPORT GestureEventDetails {
  public:
   GestureEventDetails(EventType type, float delta_x, float delta_y);
 
   EventType type() const { return type_; }
 
   int touch_points() const { return touch_points_; }
   void set_touch_points(int touch_points) { touch_points_ = touch_points; }
 
+  const gfx::Rect& bounding_box() const { return bounding_box_; }
+  void set_bounding_box(const gfx::Rect& box) { bounding_box_ = box; }
+
   float scroll_x() const {
     CHECK_EQ(ui::ET_GESTURE_SCROLL_UPDATE, type_);
     return data.scroll.x;
   }
   float scroll_y() const {
     CHECK_EQ(ui::ET_GESTURE_SCROLL_UPDATE, type_);
     return data.scroll.y;
   }
 
   float velocity_x() const {
     CHECK_EQ(ui::ET_SCROLL_FLING_START, type_);
     return data.velocity.x;
   }
   float velocity_y() const {
     CHECK_EQ(ui::ET_SCROLL_FLING_START, type_);
     return data.velocity.y;
   }
 
-  float radius_x() const {
-    CHECK_EQ(ui::ET_GESTURE_TAP, type_);
-    return data.radius.x;
-  }
-  float radius_y() const {
-    CHECK_EQ(ui::ET_GESTURE_TAP, type_);
-    return data.radius.y;
-  }
-
   int touch_id() const {
     CHECK_EQ(ui::ET_GESTURE_LONG_PRESS, type_);
     return data.touch_id;
   }
 
   float scale() const {
     CHECK_EQ(ui::ET_GESTURE_PINCH_UPDATE, type_);
     return data.scale;
   }
 
@@ skipping 30 matching lines @@
       float y;
     } scroll;
 
     float scale;  // PINCH scale.
 
     struct {  // FLING velocity.
       float x;
       float y;
     } velocity;
 
-    struct {  // TAP radius.
-      float x;
-      float y;
-    } radius;
-
     int touch_id;  // LONG_PRESS touch-id.
 
     struct {  // SWIPE direction.
       bool left;
       bool right;
       bool up;
       bool down;
     } swipe;
 
     struct {
       float delta_x;
       float delta_y;
     } generic;
   } data;
 
   int touch_points_;  // Number of active touch points in the gesture.
+
+  // Bounding box is an axis-aligned rectangle that contains all the
+  // touch-points in the gesture.

[tdanderson, 2012/07/23 20:21:02]

Instead shouldn't this comment be "contains all the enclosing rectangles of the
touch-points in the gesture" ?

[sadrul, 2012/07/23 20:34:41]

Done.

+  gfx::Rect bounding_box_;
 };
 
 // An abstract type to represent touch-events. The gesture-recognizer uses this
 // interface to communicate with the touch-events.
 class UI_EXPORT TouchEvent {
  public:
   virtual ~TouchEvent() {}
 
   virtual EventType GetEventType() const = 0;
   virtual gfx::Point GetLocation() const = 0;
@@ skipping 67 matching lines @@
                                        int touch_id,
                                        base::TimeDelta time_stamp) = 0;
 
   virtual bool DispatchLongPressGestureEvent(GestureEvent* event) = 0;
   virtual bool DispatchCancelTouchEvent(TouchEvent* event) = 0;
 };
 
 }  // namespace ui
 
 #endif  // UI_BASE_GESTURES_GESTURE_TYPES_H_