IPC::ParamTraits for ui::Event (towards ui::Events over mojo IPC)

ui/events/gesture_event_details.h

 // Copyright 2014 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_EVENTS_GESTURE_DETECTION_GESTURE_EVENT_DETAILS_H_
 #define UI_EVENTS_GESTURE_DETECTION_GESTURE_EVENT_DETAILS_H_
 
+#include <string.h>
+
 #include "base/logging.h"
 #include "ui/events/event_constants.h"
 #include "ui/events/events_base_export.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/gfx/geometry/rect_conversions.h"
 
+namespace IPC {
+template <class P> struct ParamTraits;
+}
+
 namespace ui {
 
 struct EVENTS_BASE_EXPORT GestureEventDetails {
  public:
   GestureEventDetails();
   explicit GestureEventDetails(EventType type);
   GestureEventDetails(EventType type, float delta_x, float delta_y);
 
   // The caller is responsible for ensuring that the gesture data from |other|
   // is compatible and sufficient for that expected by gestures of |type|.
@@ skipping 106 matching lines @@
   void mark_previous_scroll_update_in_sequence_prevented() {
     DCHECK_EQ(ET_GESTURE_SCROLL_UPDATE, type_);
     data_.scroll_update.previous_update_in_sequence_prevented = true;
   }
 
   bool previous_scroll_update_in_sequence_prevented() const {
     DCHECK_EQ(ET_GESTURE_SCROLL_UPDATE, type_);
     return data_.scroll_update.previous_update_in_sequence_prevented;
   }
 
+  // Supports comparison over internal structures for testing.
+  bool operator==(const GestureEventDetails& other) const {
+    return type_ == other.type_ &&
+           !memcmp(&data_, &other.data_, sizeof(Details)) &&
+           touch_points_ == other.touch_points_ &&
+           bounding_box_ == other.bounding_box_;
+  }
+
  private:
   EventType type_;
   union Details {
     Details();
     struct {  // SCROLL start details.
       // Distance that caused the scroll to start.  Generally redundant with
       // the x/y values from the first scroll_update.
       float x_hint;
       float y_hint;
     } scroll_begin;
@@ skipping 25 matching lines @@
       bool right;
       bool up;
       bool down;
     } swipe;
 
     // Tap information must be set for ET_GESTURE_TAP,
     // ET_GESTURE_TAP_UNCONFIRMED, and ET_GESTURE_DOUBLE_TAP events.
     int tap_count;  // TAP repeat count.
   } data_;
 
+  // For mojo native implementation of (de)serialization.
+  friend struct IPC::ParamTraits<ui::GestureEventDetails>;
+  friend struct IPC::ParamTraits<ui::GestureEventDetails::Details>;
+
   int touch_points_;  // Number of active touch points in the gesture.
 
   // Bounding box is an axis-aligned rectangle that contains all the
   // enclosing rectangles of the touch-points in the gesture.
   gfx::RectF bounding_box_;
 };
 
 }  // namespace ui
 
 #endif  // UI_EVENTS_GESTURE_DETECTION_GESTURE_EVENT_DETAILS_H_