ui/events/gestures/motion_event_aura.h

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef UI_EVENTS_GESTURE_DETECTION_UI_MOTION_EVENT_H_
   6 #define UI_EVENTS_GESTURE_DETECTION_UI_MOTION_EVENT_H_
   7
   8 #include <map>
   9
  10 #include "base/memory/scoped_ptr.h"
  11 #include "base/time/time.h"
  12 #include "ui/events/event.h"
  13 #include "ui/events/events_export.h"
  14 #include "ui/events/gesture_detection/motion_event_generic.h"
  15
  16 namespace ui {
  17
  18 // Implementation of MotionEvent which takes a stream of ui::TouchEvents.
  19 class EVENTS_EXPORT MotionEventAura : public MotionEventGeneric {
  20  public:
  21   MotionEventAura();
  22   ~MotionEventAura() override;
  23
  24   // MotionEventGeneric:
  25   int GetId() const override;
  26   int GetSourceDeviceId(size_t pointer_index) const override;
  27
  28   // Returns true iff the touch was valid.
  29   bool OnTouch(const TouchEvent& touch);
  30
  31   // We can't cleanup removed touch points immediately upon receipt of a
  32   // TouchCancel or TouchRelease, as the MotionEvent needs to be able to report
  33   // information about those touch events. Once the MotionEvent has been
  34   // processed, we call CleanupRemovedTouchPoints to do the required
  35   // book-keeping.
  36   void CleanupRemovedTouchPoints(const TouchEvent& event);
  37
  38  private:
  39   void AddTouch(const TouchEvent& touch);
  40   void UpdateTouch(const TouchEvent& touch);
  41   void UpdateCachedAction(const TouchEvent& touch);
  42   int GetIndexFromId(int id) const;
  43
  44   DISALLOW_COPY_AND_ASSIGN(MotionEventAura);
  45 };
  46
  47 }  // namespace ui
  48
  49 #endif  // UI_EVENTS_GESTURE_DETECTION_UI_MOTION_EVENT_H_