barrier/lib/platform/CMSWindowsScreen.h

/*
 * synergy -- mouse and keyboard sharing utility
 * Copyright (C) 2002 Chris Schoeneman
 * 
 * This package is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * found in the file COPYING that should have accompanied this file.
 * 
 * This package is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#ifndef CMSWINDOWSSCREEN_H
#define CMSWINDOWSSCREEN_H

#include "IScreen.h"
#include "CSynergyHook.h"
#include "CMutex.h"
#include "CString.h"
#define WIN32_LEAN_AND_MEAN
#include <windows.h>

class CMSWindowsScreenSaver;
class CThread;

// Microsoft windows event
class CEvent {
public:
	MSG					m_msg;
	LRESULT				m_result;
};

class IScreenReceiver;
class IMSWindowsScreenEventHandler;

//! Implementation of IScreen for Microsoft Windows
class CMSWindowsScreen : public IScreen {
public:
	CMSWindowsScreen(IScreenReceiver*, IMSWindowsScreenEventHandler*);
	virtual ~CMSWindowsScreen();

	//! @name manipulators
	//@{

	//! Initialize
	/*!
	Saves the application's HINSTANCE.  This \b must be called by
	WinMain with the HINSTANCE it was passed.
	*/
	static void			init(HINSTANCE);

	//! Open desktop
	/*!
	Open the desktop and create and return the window.  Returns NULL
	on failure.
	*/
	HWND				openDesktop();

	//! Close desktop
	/*!
	Close the window and desktop.
	*/
	void				closeDesktop();

	//! Install a one-shot timer
	/*!
	Installs a one-shot timer for \c timeout seconds and returns the
	id of the timer (which will be passed to the receiver's
	\c onTimerExpired()).
	*/
	UInt32				addOneShotTimer(double timeout);

	//@}
	//! @name accessors
	//@{

	//! Test for multiple monitors
	/*!
	Returns true iff the system appears to have multiple monitors.
	*/
	bool				isMultimon() const;

	//! Get instance
	/*!
	Returns the application instance handle passed to init().
	*/
	static HINSTANCE	getInstance();

	//@}

	// IScreen overrides
	// note -- this class expects the hook DLL to have been loaded
	// and initialized before open() is called.
	void				open();
	void				mainLoop();
	void				exitMainLoop();
	void				close();
	bool				setClipboard(ClipboardID, const IClipboard*);
	void				checkClipboards();
	void				openScreensaver(bool notify);
	void				closeScreensaver();
	void				screensaver(bool activate);
	void				syncDesktop();
	bool				getClipboard(ClipboardID, IClipboard*) const;
	void				getShape(SInt32&, SInt32&, SInt32&, SInt32&) const;
	void				getCursorPos(SInt32&, SInt32&) const;
	void				getCursorCenter(SInt32&, SInt32&) const;

private:
	// update screen size cache
	void				updateScreenShape();

	// internal pre-dispatch event processing
	bool				onPreDispatch(const CEvent* event);

	// internal (post-dispatch) event processing
	bool				onEvent(CEvent* event);

	// create the transparent cursor
	void				createBlankCursor();

	// switch to the given desktop.  this destroys the window and unhooks
	// all hooks, switches the desktop, then creates the window and rehooks
	// all hooks (because you can't switch the thread's desktop if it has
	// any windows or hooks).
	bool				switchDesktop(HDESK desk);

	// get the input desktop.  caller must CloseDesktop() the result.
	// do not call under windows 95/98/me.
	HDESK				openInputDesktop() const;

	// get the desktop's name.  do not call under windows 95/98/me.
	CString				getDesktopName(HDESK) const;

	// returns true iff desk is the current desk.  do not call under
	// windows 95/98/me.
	bool				isCurrentDesktop(HDESK desk) const;

	// our window proc
	static LRESULT CALLBACK wndProc(HWND, UINT, WPARAM, LPARAM);

private:
	static HINSTANCE	s_instance;

	IScreenReceiver*	m_receiver;
	IMSWindowsScreenEventHandler*	m_eventHandler;

	ATOM				m_class;
	HICON				m_icon;
	HCURSOR				m_cursor;

	// true if windows 95/98/me
	bool				m_is95Family;

	// our window
	HWND				m_window;

	// screen shape
	SInt32				m_x, m_y;
	SInt32				m_w, m_h;

	// true if system appears to have multiple monitors
	bool				m_multimon;

	// the main loop's thread id
	DWORD				m_threadID;

	// the thread id of the last attached thread
	DWORD				m_lastThreadID;

	// clipboard stuff
	HWND				m_nextClipboardWindow;
	bool				m_ownClipboard;

	// the timer used to check for desktop switching
	UINT				m_timer;

	// the one shot timer
	UINT				m_oneShotTimer;

	// the current desk and it's name
	HDESK				m_desk;
	CString				m_deskName;

	// screen saver stuff
	HINSTANCE					m_hookLibrary;
	InstallScreenSaverFunc		m_installScreensaver;
	UninstallScreenSaverFunc	m_uninstallScreensaver;
	CMSWindowsScreenSaver*		m_screensaver;
	bool						m_screensaverNotify;

	// true when the current desktop is inaccessible.  while
	// the desktop is inaccessible we won't receive user input
	// and we'll lose track of the keyboard state.  when the
	// desktop becomes accessible again we'll notify the event
	// handler of that.
	bool				m_inaccessibleDesktop;

	static CMSWindowsScreen*	s_screen;
};

#endif