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

ui/events/ozone/evdev/libgestures_glue/event_reader_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_EVENT_READER_LIBEVDEV_CROS_H_
+#define UI_EVENTS_OZONE_EVDEV_LIBGESTURES_GLUE_EVENT_READER_LIBEVDEV_CROS_H_
+
+#include <libevdev/libevdev.h>
+
+#include "base/files/file_path.h"
+#include "base/message_loop/message_loop.h"
+#include "ui/events/ozone/evdev/event_converter_evdev.h"
+
+namespace ui {
+
+// Basic wrapper for libevdev-cros.
+//
+// This drives libevdev-cros from a file descriptor and calls delegate
+// with the updated event state from libevdev-cros.
+//
+// The library doesn't support all devices currently. In particular there
+// is no support for keyboard events.
+class EventReaderLibevdevCros : public base::MessagePumpLibevent::Watcher,
+                                public EventConverterEvdev {
+ public:
+  class Delegate {
+   public:
+    virtual ~Delegate();
+
+    // Notifier for open. This is called with the initial event state.
+    virtual void OnLibEvdevCrosOpen(Evdev* evdev, EventStateRec* evstate) = 0;
+
+    // Notifier for event. This is called with the updated event state.
+    virtual void OnLibEvdevCrosEvent(Evdev* evdev,
+                                     EventStateRec* state,
+                                     const timeval& time) = 0;
+  };
+
+  EventReaderLibevdevCros(int fd,
+                          const base::FilePath& path,
+                          scoped_ptr<Delegate> delegate);
+  ~EventReaderLibevdevCros();
+
+  // Overridden from ui::EventDeviceEvdev.
+  void Start() OVERRIDE;
+  void Stop() OVERRIDE;
+
+  // Overidden from MessagePumpLibevent::Watcher.
+  virtual void OnFileCanReadWithoutBlocking(int fd) OVERRIDE;
+  virtual void OnFileCanWriteWithoutBlocking(int fd) OVERRIDE;
+
+ private:
+  static void OnSynReport(void* data,
+                          EventStateRec* evstate,
+                          struct timeval* tv);
+  static void OnLogMessage(void*, int level, const char*, ...);
+
+  // Libevdev state.
+  Evdev evdev_;
+
+  // Event state.
+  EventStateRec evstate_;
+
+  // Path to input device.
+  base::FilePath path_;
+
+  // Delegate for event processing.
+  scoped_ptr<Delegate> delegate_;
+
+  // Controller for watching the input fd.
+  base::MessagePumpLibevent::FileDescriptorWatcher controller_;
+
+  DISALLOW_COPY_AND_ASSIGN(EventReaderLibevdevCros);
+};
+
+}  // namspace ui
+
+#endif  // UI_EVENTS_OZONE_EVDEV_LIBGESTURES_GLUE_EVENT_READER_LIBEVDEV_CROS_H_