src/content/browser/renderer_host/input/gesture_event_packet.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 CONTENT_BROWSER_RENDERER_HOST_INPUT_GESTURE_EVENT_PACKET_H_
   6 #define CONTENT_BROWSER_RENDERER_HOST_INPUT_GESTURE_EVENT_PACKET_H_
   7
   8 #include "content/common/content_export.h"
   9 #include "third_party/WebKit/public/web/WebInputEvent.h"
  10
  11 namespace content {
  12
  13 // Acts as a transport container for gestures created (directly or indirectly)
  14 // by a touch event.
  15 class CONTENT_EXPORT GestureEventPacket {
  16  public:
  17   enum GestureSource {
  18     UNDEFINED = -1,        // Used only for a default-constructed packet.
  19     INVALID,               // The source of the gesture was invalid.
  20     TOUCH_SEQUENCE_BEGIN,  // The start of a new gesture sequence.
  21     TOUCH_SEQUENCE_END,    // The end of gesture sequence.
  22     TOUCH_BEGIN,           // A touch down occured during a gesture sequence.
  23     TOUCH_MOVE,            // A touch move occured during a gesture sequence.
  24     TOUCH_END,             // A touch up occured during a gesture sequence.
  25     TOUCH_TIMEOUT,         // Timeout from an existing gesture sequence.
  26   };
  27
  28   GestureEventPacket();
  29   GestureEventPacket(const GestureEventPacket& other);
  30   ~GestureEventPacket();
  31   GestureEventPacket& operator=(const GestureEventPacket& other);
  32
  33   // Factory methods for creating a packet from a particular event.
  34   static GestureEventPacket FromTouch(const blink::WebTouchEvent& event);
  35   static GestureEventPacket FromTouchTimeout(
  36       const blink::WebGestureEvent& event);
  37
  38   void Push(const blink::WebGestureEvent& gesture);
  39
  40   const blink::WebGestureEvent& gesture(size_t i) const { return gestures_[i]; }
  41   size_t gesture_count() const { return gesture_count_; }
  42   GestureSource gesture_source() const { return gesture_source_; }
  43
  44 private:
  45   explicit GestureEventPacket(GestureSource source);
  46
  47   enum { kMaxGesturesPerTouch = 5 };
  48   blink::WebGestureEvent gestures_[kMaxGesturesPerTouch];
  49   size_t gesture_count_;
  50   GestureSource gesture_source_;
  51 };
  52
  53 }  // namespace content
  54
  55 #endif  // CONTENT_BROWSER_RENDERER_HOST_INPUT_GESTURE_EVENT_PACKET_H_