blob: 4f544a904d1ccf54a55aa2a5e649bf9986f14680 [file] [log] [blame]
// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef UI_EVENTS_WIN_KEYBOARD_HOOK_MONITOR_IMPL_H_
#define UI_EVENTS_WIN_KEYBOARD_HOOK_MONITOR_IMPL_H_
#include "base/component_export.h"
#include "base/no_destructor.h"
#include "base/observer_list_threadsafe.h"
#include "base/threading/thread_checker.h"
#include "ui/events/win/keyboard_hook_monitor.h"
#include "ui/events/win/keyboard_hook_observer.h"
namespace ui {
// An implementation of the KeyboardHookMonitor interface which is used to
// notify listeners of KeyboardHook registration events and provide status.
// Note that this class is bound to the thread which creates it. In the browser
// process, this will be the UI thread. All methods should be called on that
// thread and all observer methods will be run on that thread.
class COMPONENT_EXPORT(KEYBOARD_HOOK) KeyboardHookMonitorImpl
: public KeyboardHookMonitor {
public:
static KeyboardHookMonitorImpl* GetInstance();
KeyboardHookMonitorImpl(const KeyboardHookMonitorImpl&) = delete;
KeyboardHookMonitorImpl& operator=(const KeyboardHookMonitorImpl&) = delete;
KeyboardHookMonitorImpl(KeyboardHookMonitorImpl&&) = delete;
KeyboardHookMonitorImpl& operator=(KeyboardHookMonitorImpl&&) = delete;
~KeyboardHookMonitorImpl() override;
// KeyboardHookMonitor implementation.
void AddObserver(KeyboardHookObserver* observer) override;
void RemoveObserver(KeyboardHookObserver* observer) override;
bool IsActive() override;
// Send a notification to all listeners in |observers_| to indicate that a
// keyboard hook has been registered and is listening for key events.
void NotifyHookRegistered();
// Send a notification to all listeners in |observers_| to indicate that a
// keyboard hook has been removed and is no longer listening to key events.
void NotifyHookUnregistered();
private:
friend base::NoDestructor<KeyboardHookMonitorImpl>;
KeyboardHookMonitorImpl();
bool is_hook_active_ = false;
base::ObserverList<KeyboardHookObserver> observers_;
THREAD_CHECKER(thread_checker_);
};
} // namespace ui
#endif // UI_EVENTS_WIN_KEYBOARD_HOOK_MONITOR_IMPL_H_