deskflow/src/lib/platform/MSWindowsScreenSaver.h

/*
 * Deskflow -- mouse and keyboard sharing utility
 * SPDX-FileCopyrightText: (C) 2012 - 2016 Symless Ltd.
 * SPDX-FileCopyrightText: (C) 2002 Chris Schoeneman
 * SPDX-License-Identifier: GPL-2.0-only WITH LicenseRef-OpenSSL-Exception
 */

#pragma once

#include "deskflow/IScreenSaver.h"

#define WIN32_LEAN_AND_MEAN
#include <Windows.h>

class Thread;

//! Microsoft windows screen saver implementation
class MSWindowsScreenSaver : public IScreenSaver
{
public:
  MSWindowsScreenSaver();
  ~MSWindowsScreenSaver() override;

  //! @name manipulators
  //@{

  //! Check if screen saver started
  /*!
  Check if the screen saver really started.  Returns false if it
  hasn't, true otherwise.  When the screen saver stops, \c msg will
  be posted to the current thread's message queue with the given
  parameters.
  */
  bool checkStarted(UINT msg, WPARAM, LPARAM);

  //@}

  // IScreenSaver overrides
  void enable() override;
  void disable() override;
  void activate() override;
  void deactivate() override;
  bool isActive() const override;

private:
  class FindScreenSaverInfo
  {
  public:
    HDESK m_desktop;
    HWND m_window;
  };

  static BOOL CALLBACK killScreenSaverFunc(HWND hwnd, LPARAM lParam);

  void watchDesktop();
  void watchProcess(HANDLE process);
  void unwatchProcess();
  void watchDesktopThread(void *);
  void watchProcessThread(void *);

  void setSecure(bool secure, bool saveSecureAsInt);
  bool isSecure(bool *wasSecureAnInt) const;

private:
  BOOL m_wasEnabled;
  bool m_wasSecure;
  bool m_wasSecureAnInt;

  HANDLE m_process;
  Thread *m_watch;
  DWORD m_threadID;
  UINT m_msg;
  WPARAM m_wParam;
  LPARAM m_lParam;

  // checkActive state.  true if the screen saver is being watched
  // for deactivation (and is therefore active).
  bool m_active;
};