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// Copyright 2023 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef ASH_ACCELERATORS_SHORTCUT_INPUT_HANDLER_H_
#define ASH_ACCELERATORS_SHORTCUT_INPUT_HANDLER_H_
#include "ash/ash_export.h"
#include "ash/events/prerewritten_event_forwarder.h"
#include "ash/public/mojom/input_device_settings.mojom-forward.h"
#include "base/observer_list.h"
#include "ui/events/event_handler.h"
namespace ui {
class KeyEvent;
} // namespace ui
namespace ash {
// `ShortcutInputHandler` intercepts events and forwards them to other
// components for the purposes of inputting shortcuts in ChromeOS. Utilized in
// the Peripheral Customization and Shortcut Customization features. This class
// is intended to be a singleton and used by both apps through the same
// instance.
class ASH_EXPORT ShortcutInputHandler
: public ui::EventHandler,
public PrerewrittenEventForwarder::Observer {
public:
class Observer : public base::CheckedObserver {
public:
// Called whenever a key event is pressed by the user when the
// `ShortcutInputHandler` is observing.
virtual void OnShortcutInputEventPressed(
const mojom::KeyEvent& key_event) = 0;
// Called whenever a key event is released by the user when the
// `ShortcutInputHandler` is observing.
virtual void OnShortcutInputEventReleased(
const mojom::KeyEvent& key_event) = 0;
// Called whenever a key event is pressed by the user when the
// `ShortcutInputHandler` is observing. Sends the pre-rewritten event.
virtual void OnPrerewrittenShortcutInputEventPressed(
const mojom::KeyEvent& key_event) = 0;
// Called whenever a key event is released by the user when the
// `ShortcutInputHandler` is observing. Sends the pre-rewritten event.
virtual void OnPrerewrittenShortcutInputEventReleased(
const mojom::KeyEvent& key_event) = 0;
};
ShortcutInputHandler();
~ShortcutInputHandler() override;
ShortcutInputHandler(const ShortcutInputHandler&) = delete;
ShortcutInputHandler& operator=(const ShortcutInputHandler&) = delete;
void Initialize();
// ui::EventHandler:
void OnKeyEvent(ui::KeyEvent* event) override;
// PrerewrittenEventForwarder::Observer:
void OnPrerewriteKeyInputEvent(const ui::KeyEvent& event) override;
void SetShouldConsumeKeyEvents(bool should_consume_key_events);
bool should_consume_key_events() const { return should_consume_key_events_; }
void AddObserver(Observer* observer);
void RemoveObserver(Observer* observer);
private:
bool should_consume_key_events_ = false;
base::ObserverList<Observer> observers_;
bool initialized_ = false;
};
} // namespace ash
#endif // ASH_ACCELERATORS_SHORTCUT_INPUT_HANDLER_H_
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