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 <bitset>
   9 #include <gestures/gestures.h>
  10 #include <libevdev/libevdev.h>
  11
  12 #include "base/callback.h"
  13 #include "base/memory/scoped_ptr.h"
  14 #include "ui/events/ozone/evdev/cursor_delegate_evdev.h"
  15 #include "ui/events/ozone/evdev/event_device_util.h"
  16 #include "ui/events/ozone/evdev/event_dispatch_callback.h"
  17 #include "ui/events/ozone/evdev/events_ozone_evdev_export.h"
  18 #include "ui/events/ozone/evdev/libgestures_glue/event_reader_libevdev_cros.h"
  19
  20 namespace ui {
  21
  22 class DeviceEventDispatcherEvdev;
  23 class EventDeviceInfo;
  24 class CursorDelegateEvdev;
  25 struct 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                                  CursorDelegateEvdev* cursor,
  46                                  GesturePropertyProvider* property_provider,
  47                                  DeviceEventDispatcherEvdev* dispatcher);
  48   ~GestureInterpreterLibevdevCros() override;
  49
  50   // Overriden from ui::EventReaderLibevdevCros::Delegate
  51   void OnLibEvdevCrosOpen(Evdev* evdev, EventStateRec* evstate) override;
  52   void OnLibEvdevCrosEvent(Evdev* evdev,
  53                            EventStateRec* evstate,
  54                            const timeval& time) override;
  55   void OnLibEvdevCrosStopped(Evdev* evdev, EventStateRec* state) override;
  56
  57   // Handler for gesture events generated from libgestures.
  58   void OnGestureReady(const Gesture* gesture);
  59
  60   // Accessors.
  61   int id() { return id_; }
  62   GesturePropertyProvider* property_provider() { return property_provider_; }
  63   Evdev* evdev() { return evdev_; }
  64
  65  private:
  66   void OnGestureMove(const Gesture* gesture, const GestureMove* move);
  67   void OnGestureScroll(const Gesture* gesture, const GestureScroll* move);
  68   void OnGestureButtonsChange(const Gesture* gesture,
  69                               const GestureButtonsChange* move);
  70   void OnGestureContactInitiated(const Gesture* gesture);
  71   void OnGestureFling(const Gesture* gesture, const GestureFling* fling);
  72   void OnGestureSwipe(const Gesture* gesture, const GestureSwipe* swipe);
  73   void OnGestureSwipeLift(const Gesture* gesture,
  74                           const GestureSwipeLift* swipelift);
  75   void OnGesturePinch(const Gesture* gesture, const GesturePinch* pinch);
  76   void OnGestureMetrics(const Gesture* gesture, const GestureMetrics* metrics);
  77
  78   void DispatchChangedMouseButtons(unsigned int changed_buttons,
  79                                    bool down,
  80                                    stime_t time);
  81   void DispatchMouseButton(unsigned int button,
  82                            bool down,
  83                            stime_t time);
  84   void DispatchChangedKeys(unsigned long* changed_keys, stime_t timestamp);
  85   void ReleaseKeys(stime_t timestamp);
  86   bool SetMouseButtonState(unsigned int button, bool down);
  87   void ReleaseMouseButtons(stime_t timestamp);
  88
  89   // The unique device id.
  90   int id_;
  91
  92   // True if the device may be regarded as a mouse. This includes normal mice
  93   // and multi-touch mice.
  94   bool is_mouse_ = false;
  95
  96   // Shared cursor state.
  97   CursorDelegateEvdev* cursor_;
  98
  99   // Shared gesture property provider.
 100   GesturePropertyProvider* property_provider_;
 101
 102   // Dispatcher for events.
 103   DeviceEventDispatcherEvdev* dispatcher_;
 104
 105   // Gestures interpretation state.
 106   gestures::GestureInterpreter* interpreter_ = nullptr;
 107
 108   // Last key state from libevdev.
 109   unsigned long prev_key_state_[EVDEV_BITS_TO_LONGS(KEY_CNT)];
 110
 111   // Last mouse button state.
 112   static const int kMouseButtonCount = BTN_JOYSTICK - BTN_MOUSE;
 113   std::bitset<kMouseButtonCount> mouse_button_state_;
 114
 115   // Device pointer.
 116   Evdev* evdev_ = nullptr;
 117
 118   // Gesture lib device properties.
 119   scoped_ptr<GestureDeviceProperties> device_properties_;
 120
 121   DISALLOW_COPY_AND_ASSIGN(GestureInterpreterLibevdevCros);
 122 };
 123
 124 }  // namspace ui
 125
 126 #endif  // UI_EVENTS_OZONE_EVDEV_LIBGESTURES_GLUE_GESTURE_INTERPRETER_LIBEVDEV_CROS_H_