barrier/lib/platform/CMSWindowsClipboard.h

/*
 * synergy-plus -- mouse and keyboard sharing utility
 * Copyright (C) 2009 The Synergy+ Project
 * 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef CMSWINDOWSCLIPBOARD_H
#define CMSWINDOWSCLIPBOARD_H

#include "IClipboard.h"
#include "stdvector.h"
#define WIN32_LEAN_AND_MEAN
#include <windows.h>

class IMSWindowsClipboardConverter;

//! Microsoft windows clipboard implementation
class CMSWindowsClipboard : public IClipboard {
public:
	CMSWindowsClipboard(HWND window);
	virtual ~CMSWindowsClipboard();

	//! Empty clipboard without ownership
	/*!
	Take ownership of the clipboard and clear all data from it.
	This must be called between a successful open() and close().
	Return false if the clipboard ownership could not be taken;
	the clipboard should not be emptied in this case.  Unlike
	empty(), isOwnedBySynergy() will return false when emptied
	this way.  This is useful when synergy wants to put data on
	clipboard but pretend (to itself) that some other app did it.
	When using empty(), synergy assumes the data came from the
	server and doesn't need to be sent back.  emptyUnowned()
	makes synergy send the data to the server.
	*/
	bool				emptyUnowned();

	//! Test if clipboard is owned by synergy
	static bool			isOwnedBySynergy();

	// IClipboard overrides
	virtual bool		empty();
	virtual void		add(EFormat, const CString& data);
	virtual bool		open(Time) const;
	virtual void		close() const;
	virtual Time		getTime() const;
	virtual bool		has(EFormat) const;
	virtual CString		get(EFormat) const;

private:
	void				clearConverters();

	UINT				convertFormatToWin32(EFormat) const;
	HANDLE				convertTextToWin32(const CString& data) const;
	CString				convertTextFromWin32(HANDLE) const;

	static UINT			getOwnershipFormat();

private:
	typedef std::vector<IMSWindowsClipboardConverter*> ConverterList;

	HWND				m_window;
	mutable Time		m_time;
	ConverterList		m_converters;
	static UINT			s_ownershipFormat;
};

//! Clipboard format converter interface
/*!
This interface defines the methods common to all win32 clipboard format
converters.
*/
class IMSWindowsClipboardConverter : public IInterface {
public:
	// accessors

	// return the clipboard format this object converts from/to
	virtual IClipboard::EFormat
						getFormat() const = 0;

	// return the atom representing the win32 clipboard format that
	// this object converts from/to
	virtual UINT		getWin32Format() const = 0;

	// convert from the IClipboard format to the win32 clipboard format.
	// the input data must be in the IClipboard format returned by
	// getFormat().  the return data will be in the win32 clipboard
	// format returned by getWin32Format(), allocated by GlobalAlloc().
	virtual HANDLE		fromIClipboard(const CString&) const = 0;

	// convert from the win32 clipboard format to the IClipboard format
	// (i.e., the reverse of fromIClipboard()).
	virtual CString		toIClipboard(HANDLE data) const = 0;
};

#endif