src/ui/events/ozone/evdev/libgestures_glue/gesture_interpreter_libevdev_cros.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_OZONE_EVDEV_LIBGESTURES_GLUE_GESTURE_INTERPRETER_LIBEVDEV_CROS_H_
   6 #define UI_EVENTS_OZONE_EVDEV_LIBGESTURES_GLUE_GESTURE_INTERPRETER_LIBEVDEV_CROS_H_
   7
   8 #include <gestures/gestures.h>
   9 #include <libevdev/libevdev.h>
  10
  11 #include "base/callback.h"
  12 #include "base/memory/scoped_ptr.h"
  13 #include "ui/events/ozone/evdev/cursor_delegate_evdev.h"
  14 #include "ui/events/ozone/evdev/event_device_util.h"
  15 #include "ui/events/ozone/evdev/event_dispatch_callback.h"
  16 #include "ui/events/ozone/evdev/events_ozone_evdev_export.h"
  17 #include "ui/events/ozone/evdev/libgestures_glue/event_reader_libevdev_cros.h"
  18
  19 namespace ui {
  20
  21 class EventDeviceInfo;
  22 class EventModifiersEvdev;
  23 class CursorDelegateEvdev;
  24 class KeyboardEvdev;
  25 class GestureDeviceProperties;
  26 class GesturePropertyProvider;
  27
  28 // Convert libevdev-cros events to ui::Events using libgestures.
  29 //
  30 // This builds a GestureInterpreter for an input device (touchpad or
  31 // mouse).
  32 //
  33 // Raw input events must be preprocessed into a form suitable for
  34 // libgestures. The kernel protocol only emits changes to the device state,
  35 // so changes must be accumulated until a sync event. The full device state
  36 // at sync is then processed by libgestures.
  37 //
  38 // Once we have the state at sync, we convert it to a HardwareState object
  39 // and forward it to libgestures. If any gestures are produced, they are
  40 // converted to ui::Events and dispatched.
  41 class EVENTS_OZONE_EVDEV_EXPORT GestureInterpreterLibevdevCros
  42     : public EventReaderLibevdevCros::Delegate {
  43  public:
  44   GestureInterpreterLibevdevCros(int id,
  45                                  EventModifiersEvdev* modifiers,
  46                                  CursorDelegateEvdev* cursor,
  47                                  KeyboardEvdev* keyboard,
  48                                  GesturePropertyProvider* property_provider,
  49                                  const EventDispatchCallback& callback);
  50   ~GestureInterpreterLibevdevCros() override;
  51
  52   // Overriden from ui::EventReaderLibevdevCros::Delegate
  53   void OnLibEvdevCrosOpen(Evdev* evdev, EventStateRec* evstate) override;
  54   void OnLibEvdevCrosEvent(Evdev* evdev,
  55                            EventStateRec* evstate,
  56                            const timeval& time) override;
  57
  58   // Handler for gesture events generated from libgestures.
  59   void OnGestureReady(const Gesture* gesture);
  60
  61   // Accessors.
  62   int id() { return id_; }
  63   GesturePropertyProvider* property_provider() { return property_provider_; }
  64   Evdev* evdev() { return evdev_; }
  65
  66  private:
  67   void OnGestureMove(const Gesture* gesture, const GestureMove* move);
  68   void OnGestureScroll(const Gesture* gesture, const GestureScroll* move);
  69   void OnGestureButtonsChange(const Gesture* gesture,
  70                               const GestureButtonsChange* move);
  71   void OnGestureContactInitiated(const Gesture* gesture);
  72   void OnGestureFling(const Gesture* gesture, const GestureFling* fling);
  73   void OnGestureSwipe(const Gesture* gesture, const GestureSwipe* swipe);
  74   void OnGestureSwipeLift(const Gesture* gesture,
  75                           const GestureSwipeLift* swipelift);
  76   void OnGesturePinch(const Gesture* gesture, const GesturePinch* pinch);
  77   void OnGestureMetrics(const Gesture* gesture, const GestureMetrics* metrics);
  78
  79   void Dispatch(scoped_ptr<Event> event);
  80   void DispatchMouseButton(unsigned int modifier, bool down);
  81   void DispatchChangedKeys(Evdev* evdev, const timeval& time);
  82
  83   // The unique device id.
  84   int id_;
  85
  86   // Shared modifier state.
  87   EventModifiersEvdev* modifiers_;
  88
  89   // Shared cursor state.
  90   CursorDelegateEvdev* cursor_;
  91
  92   // Shared keyboard state.
  93   KeyboardEvdev* keyboard_;
  94
  95   // Shared gesture property provider.
  96   GesturePropertyProvider* property_provider_;
  97
  98   // Callback for dispatching events.
  99   EventDispatchCallback dispatch_callback_;
 100
 101   // Gestures interpretation state.
 102   gestures::GestureInterpreter* interpreter_;
 103
 104   // Last key state from libevdev.
 105   unsigned long prev_key_state_[EVDEV_BITS_TO_LONGS(KEY_CNT)];
 106
 107   // Device pointer.
 108   Evdev* evdev_;
 109
 110   // Gesture lib device properties.
 111   scoped_ptr<GestureDeviceProperties> device_properties_;
 112
 113   DISALLOW_COPY_AND_ASSIGN(GestureInterpreterLibevdevCros);
 114 };
 115
 116 }  // namspace ui
 117
 118 #endif  // UI_EVENTS_OZONE_EVDEV_LIBGESTURES_GLUE_GESTURE_INTERPRETER_LIBEVDEV_CROS_H_