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// Copyright 2015 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 COMPONENTS_EXO_KEYBOARD_H_
#define COMPONENTS_EXO_KEYBOARD_H_
#include <vector>
#include "ash/wm/tablet_mode/tablet_mode_observer.h"
#include "base/containers/flat_map.h"
#include "base/containers/flat_set.h"
#include "base/macros.h"
#include "base/observer_list.h"
#include "components/exo/keyboard_observer.h"
#include "components/exo/seat_observer.h"
#include "components/exo/surface_observer.h"
#include "ui/events/devices/input_device_event_observer.h"
#include "ui/events/event.h"
#include "ui/events/event_handler.h"
namespace ui {
enum class DomCode;
class KeyEvent;
}
namespace exo {
class KeyboardDelegate;
class KeyboardDeviceConfigurationDelegate;
class Seat;
class Surface;
// This class implements a client keyboard that represents one or more keyboard
// devices.
class Keyboard : public ui::EventHandler,
public ui::InputDeviceEventObserver,
public ash::TabletModeObserver,
public SurfaceObserver,
public SeatObserver {
public:
Keyboard(KeyboardDelegate* delegate, Seat* seat);
~Keyboard() override;
KeyboardDelegate* delegate() const { return delegate_; }
bool HasDeviceConfigurationDelegate() const;
void SetDeviceConfigurationDelegate(
KeyboardDeviceConfigurationDelegate* delegate);
// Management of the observer list.
void AddObserver(KeyboardObserver* observer);
bool HasObserver(KeyboardObserver* observer) const;
void RemoveObserver(KeyboardObserver* observer);
void SetNeedKeyboardKeyAcks(bool need_acks);
bool AreKeyboardKeyAcksNeeded() const;
void AckKeyboardKey(uint32_t serial, bool handled);
// Overridden from ui::EventHandler:
void OnKeyEvent(ui::KeyEvent* event) override;
// Overridden from SurfaceObserver:
void OnSurfaceDestroying(Surface* surface) override;
// Overridden from ui::InputDeviceEventObserver:
void OnKeyboardDeviceConfigurationChanged() override;
// Overridden from ash::TabletModeObserver:
void OnTabletModeStarted() override;
void OnTabletModeEnding() override;
void OnTabletModeEnded() override;
// Overridden from SeatObserver:
void OnSurfaceFocusing(Surface* gaining_focus) override;
void OnSurfaceFocused(Surface* gained_focus) override;
private:
// Change keyboard focus to |surface|.
void SetFocus(Surface* surface);
// Processes expired key state changes in |pending_key_acks_| as they have not
// been acknowledged.
void ProcessExpiredPendingKeyAcks();
// Schedule next call of ProcessExpiredPendingKeyAcks after |delay|
void ScheduleProcessExpiredPendingKeyAcks(base::TimeDelta delay);
// Adds/Removes pre or post event handler depending on if key acks are needed.
// If key acks are needed, pre target handler will be added because this class
// wants to dispatch keys before they are consumed by Chrome. Otherwise, post
// target handler will be added because all accelerators should be handled by
// Chrome before they are dispatched by this class.
void AddEventHandler();
void RemoveEventHandler();
// The delegate instance that all events except for events about device
// configuration are dispatched to.
KeyboardDelegate* const delegate_;
// Seat that the Keyboard recieves focus events from.
Seat* const seat_;
// The delegate instance that events about device configuration are dispatched
// to.
KeyboardDeviceConfigurationDelegate* device_configuration_delegate_ = nullptr;
// Indicates that each key event is expected to be acknowledged.
bool are_keyboard_key_acks_needed_ = false;
// The current focus surface for the keyboard.
Surface* focus_ = nullptr;
// Set of currently pressed keys.
base::flat_set<ui::DomCode> pressed_keys_;
// Current set of modifier flags.
int modifier_flags_ = 0;
// Key state changes that are expected to be acknowledged.
using KeyStateChange = std::pair<ui::KeyEvent, base::TimeTicks>;
base::flat_map<uint32_t, KeyStateChange> pending_key_acks_;
// Indicates that a ProcessExpiredPendingKeyAcks call is pending.
bool process_expired_pending_key_acks_pending_ = false;
// Delay until a key state change expected to be acknowledged is expired.
const base::TimeDelta expiration_delay_for_pending_key_acks_;
base::ObserverList<KeyboardObserver> observer_list_;
base::WeakPtrFactory<Keyboard> weak_ptr_factory_;
DISALLOW_COPY_AND_ASSIGN(Keyboard);
};
} // namespace exo
#endif // COMPONENTS_EXO_KEYBOARD_H_
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