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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 UI_VIEWS_WIN_WINDOWS_SESSION_CHANGE_OBSERVER_H_
#define UI_VIEWS_WIN_WINDOWS_SESSION_CHANGE_OBSERVER_H_
#include <windows.h>
#include "base/callback.h"
#include "base/macros.h"
namespace views {
// Calls the provided callback on WM_WTSSESSION_CHANGE messages along with
// managing the tricky business of observing a singleton object.
class WindowsSessionChangeObserver {
public:
typedef base::Callback<void(WPARAM)> WtsCallback;
explicit WindowsSessionChangeObserver(const WtsCallback& callback);
~WindowsSessionChangeObserver();
private:
class WtsRegistrationNotificationManager;
void OnSessionChange(WPARAM wparam);
void ClearCallback();
WtsCallback callback_;
DISALLOW_COPY_AND_ASSIGN(WindowsSessionChangeObserver);
};
} // namespace views
#endif // UI_VIEWS_WIN_WINDOWS_SESSION_CHANGE_OBSERVER_H_
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