ozone: evdev: Factor keyboard into KeyboardEvdev

ui/events/ozone/evdev/keyboard_evdev.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_KEYBOARD_EVDEV_H_
+#define UI_EVENTS_OZONE_EVDEV_KEYBOARD_EVDEV_H_
+
+#include <bitset>
+#include <linux/input.h>
+
+#include "ui/events/ozone/evdev/event_device_util.h"
+#include "ui/events/ozone/evdev/event_dispatch_callback.h"
+#include "ui/events/ozone/evdev/events_ozone_evdev_export.h"
+
+namespace ui {
+
+class EventModifiersEvdev;
+
+// Keyboard for evdev.
+//
+// This object is responsible for combining all attached keyboards into
+// one logical keyboard, applying modifiers & implementing key repeat.
+//
+// It also currently also applies the layout (hardcoded as US).
+//
+// TODO(spang): Implement key repeat & turn off kernel repeat.
+class EVENTS_OZONE_EVDEV_EXPORT KeyboardEvdev {
+ public:
+  KeyboardEvdev(EventModifiersEvdev* modifiers,
+                const EventDispatchCallback& callback);
+  ~KeyboardEvdev();
+
+  // Handlers for raw key presses & releases.
+  void OnKeyChange(unsigned int code, bool down);
+
+ private:
+  void UpdateModifier(unsigned int key, bool down);
+  void DispatchKey(unsigned int key, bool down);
+
+  // Aggregated key state. There is only one bit of state per key; we do not
+  // attempt to count presses of the same key on multiple keyboards.
+  //
+  // A key is down iff the most recent event pertaining to that key was a key
+  // down event rather than a key up event. Therefore, a particular key position
+  // can be considered released even if it is being depresssed on one or more
+  // keyboards.
+  std::bitset<KEY_CNT> key_state_;
+
+  // Callback for dispatching events.
+  EventDispatchCallback callback_;
+
+  // Shared modifier state.
+  EventModifiersEvdev* modifiers_;
+
+  DISALLOW_COPY_AND_ASSIGN(KeyboardEvdev);
+};
+
+}  // namespace ui
+
+#endif  // UI_EVENTS_OZONE_EVDEV_KEYBOARD_EVDEV_H_