/*
 * synergy -- mouse and keyboard sharing utility
 * Copyright (C) 2003 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 CXWINDOWSKEYSTATE_H
#define CXWINDOWSKEYSTATE_H

#include "CKeyState.h"
#include "stdmap.h"
#if X_DISPLAY_MISSING
#	error X11 is required to build synergy
#else
#	include <X11/Xlib.h>
#	if HAVE_X11_EXTENSIONS_XTEST_H
#		include <X11/extensions/XTest.h>
#	else
#		error The XTest extension is required to build synergy
#	endif
#endif

//! X Windows key state
/*!
A key state for X Windows.
*/
class CXWindowsKeyState : public CKeyState {
public:
	CXWindowsKeyState(Display*);
	~CXWindowsKeyState();

	//! @name accessors
	//@{

	//! Convert X modifier mask to synergy mask
	/*!
	Returns the synergy modifier mask corresponding to the X modifier
	mask in \p state.
	*/
	KeyModifierMask		mapModifiersFromX(unsigned int state) const;

	//@}

	// IKeyState overrides
	virtual bool		fakeCtrlAltDel();
	virtual const char*	getKeyName(KeyButton) const;

protected:
	// IKeyState overrides
	virtual void		doUpdateKeys();
	virtual void		doFakeKeyEvent(KeyButton button,
							bool press, bool isAutoRepeat);
	virtual KeyButton	mapKey(Keystrokes& keys, KeyID id,
							KeyModifierMask desiredMask,
							bool isAutoRepeat) const;

private:
	class KeyMapping {
	public:
		KeyMapping();

	public:
		// KeyCode to generate keysym and whether keycode[i] is
		// sensitive to shift and mode switch.
		KeyCode			m_keycode[4];
		bool			m_shiftSensitive[4];
		bool			m_modeSwitchSensitive[4];

		// the modifier mask of keysym or 0 if not a modifier
		KeyModifierMask	m_modifierMask;

		// whether keysym is sensitive to caps and num lock
		bool			m_numLockSensitive;
		bool			m_capsLockSensitive;
	};
	typedef std::map<KeySym, KeyMapping> KeySymMap;
	typedef KeySymMap::const_iterator KeySymIndex;

	// save the current keyboard mapping and note the modifiers
	void				updateKeysymMap();

	// note interesting modifier KeySyms
	void				updateModifiers();

	// map a modifier index and its KeySym to a modifier mask.  also
	// save the modifier mask in one of m_*Mask.
	KeyModifierMask		mapToModifierMask(unsigned int, KeySym);

	// convert a KeyID to a KeySym
	KeySym				keyIDToKeySym(KeyID id, KeyModifierMask mask) const;

	// map a KeySym into the keystrokes to produce it
	KeyButton			mapToKeystrokes(Keystrokes& keys,
							KeySymIndex keyIndex,
							bool isAutoRepeat,
							bool pressAndRelease) const;

	// map a decomposition into keystrokes to produce it.  returns the
	// last key added to keys iff successful and 0 otherwise.
	KeyButton			mapDecompositionToKeystrokes(Keystrokes& keys,
							KeySym keysym, bool usingDeadKeys) const;

	// choose the best set of modifiers to generate the KeySym
	unsigned int		findBestKeyIndex(KeySymIndex keyIndex,
							KeyModifierMask currentMask) const;

	// returns true if the sense of shift is inverted for KeySym
	bool				isShiftInverted(KeySymIndex keyIndex,
							KeyModifierMask currentMask) const;

	// returns the keystrokes to adjust the modifiers into the desired
	// state the keystrokes to get back to the current state.
	bool				adjustModifiers(Keystrokes& keys,
							Keystrokes& undo,
							KeyModifierMask desiredMask) const;

	// returns true if keysym is sensitive to the NumLock state
	bool				isNumLockSensitive(KeySym keysym) const;

	// returns true if keysym is sensitive to the CapsLock state
	bool				isCapsLockSensitive(KeySym keysym) const;

private:
	Display*			m_display;

	// keysym to keycode mapping
	KeySymMap			m_keysymMap;

	// the keyboard control state the last time this screen was entered
	XKeyboardState		m_keyControl;

	// modifier keysyms
	KeySym				m_modeSwitchKeysym;

	// modifier masks
	unsigned int		m_altMask;
	unsigned int		m_metaMask;
	unsigned int		m_superMask;
	unsigned int		m_modeSwitchMask;
	unsigned int		m_numLockMask;
	unsigned int		m_scrollLockMask;
};

#endif