ozone: evdev: Add libgestures bindings for touchpad & mouse support

ui/events/ozone/evdev/libgestures_glue/gesture_interpreter_libevdev_cros.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_OZONE_EVDEV_LIBGESTURES_GLUE_GESTURE_INTERPRETER_LIBEVDEV_CROS_H_
+#define UI_EVENTS_OZONE_EVDEV_LIBGESTURES_GLUE_GESTURE_INTERPRETER_LIBEVDEV_CROS_H_
+
+#include <gestures/gestures.h>
+#include <libevdev/libevdev.h>
+
+#include "base/callback.h"
+#include "base/memory/scoped_ptr.h"
+#include "ui/events/events_export.h"
+#include "ui/events/ozone/evdev/cursor_delegate_evdev.h"
+#include "ui/events/ozone/evdev/libgestures_glue/event_reader_libevdev_cros.h"
+
+namespace ui {
+
+class Event;
+class EventDeviceInfo;
+class EventModifiersEvdev;
+class CursorDelegateEvdev;
+
+typedef base::Callback<void(Event*)> EventDispatchCallback;
+
+// Convert libevdev-cros events to ui::Events using libgestures.
+//
+// This builds a GestureInterpreter for an input device (touchpad or
+// mouse).
+//
+// Raw input events must be preprocessed into a form suitable for
+// libgestures. The kernel protocol only emits changes to the device state,
+// so changes must be accumulated until a sync event. The full device state
+// at sync is then processed by libgestures.
+//
+// Once we have the state at sync, we convert it to a HardwareState object
+// and forward it to libgestures. If any gestures are produced, they are
+// converted to ui::Events and dispatched.
+class EVENTS_EXPORT GestureInterpreterLibevdevCros
+    : public EventReaderLibevdevCros::Delegate {
+ public:
+  GestureInterpreterLibevdevCros(EventModifiersEvdev* modifiers,
+                                 CursorDelegateEvdev* cursor,
+                                 const EventDispatchCallback& callback);
+  virtual ~GestureInterpreterLibevdevCros();
+
+  // Overriden from ui::EventReaderLibevdevCros::Delegate
+  virtual void OnLibEvdevCrosOpen(Evdev* evdev,
+                                  EventStateRec* evstate) OVERRIDE;
+  virtual void OnLibEvdevCrosEvent(Evdev* evdev,
+                                   EventStateRec* evstate,
+                                   const timeval& time) OVERRIDE;
+
+  // Handler for gesture events generated from libgestures.
+  void OnGestureReady(const Gesture* gesture);
+
+ private:
+  void OnGestureMove(const Gesture* gesture, const GestureMove* move);
+  void OnGestureScroll(const Gesture* gesture, const GestureScroll* move);
+  void OnGestureButtonsChange(const Gesture* gesture,
+                              const GestureButtonsChange* move);
+  void Dispatch(Event* event);
+  void DispatchMouseButton(unsigned int modifier, bool down);
+
+  // Shared modifier state.
+  EventModifiersEvdev* modifiers_;
+
+  // Shared cursor state.
+  CursorDelegateEvdev* cursor_;
+
+  // Callback for dispatching events.
+  EventDispatchCallback dispatch_callback_;
+
+  // Gestures interpretation state.
+  gestures::GestureInterpreter* interpreter_;
+
+  DISALLOW_COPY_AND_ASSIGN(GestureInterpreterLibevdevCros);
+};
+
+}  // namspace ui
+
+#endif  // UI_EVENTS_OZONE_EVDEV_LIBGESTURES_GLUE_GESTURE_INTERPRETER_LIBEVDEV_CROS_H_