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/***********************************************************************
	filename: 	CEGUIMenuBase.h
	created:	5/4/2005
	author:		Tomas Lindquist Olsen (based on code by Paul D Turner)
	
	purpose:	Interface to base class for MenuBase widget
*************************************************************************/
/***************************************************************************
 *   Copyright (C) 2004 - 2006 Paul D Turner & The CEGUI Development Team
 *
 *   Permission is hereby granted, free of charge, to any person obtaining
 *   a copy of this software and associated documentation files (the
 *   "Software"), to deal in the Software without restriction, including
 *   without limitation the rights to use, copy, modify, merge, publish,
 *   distribute, sublicense, and/or sell copies of the Software, and to
 *   permit persons to whom the Software is furnished to do so, subject to
 *   the following conditions:
 *
 *   The above copyright notice and this permission notice shall be
 *   included in all copies or substantial portions of the Software.
 *
 *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 *   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 *   IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
 *   OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 *   ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 *   OTHER DEALINGS IN THE SOFTWARE.
 ***************************************************************************/
#ifndef _CEGUIMenuBase_h_
#define _CEGUIMenuBase_h_

#include "CEGUIBase.h"
#include "CEGUIWindow.h"
#include "elements/CEGUIMenuBaseProperties.h"
#include "elements/CEGUIItemListBase.h"


#if defined(_MSC_VER)
#	pragma warning(push)
#	pragma warning(disable : 4251)
#endif


// Start of CEGUI namespace section
namespace CEGUI
{

/*!
\brief
	Abstract base class for menus.
*/
class CEGUIEXPORT MenuBase : public ItemListBase
{
public:
	static const String EventNamespace;				//!< Namespace for global events


	/*************************************************************************
		Event name constants
	*************************************************************************/
	// generated internally by Window
	static const String EventPopupOpened;					//!< A MenuItem attached to this menu opened a PopupMenu
	static const String EventPopupClosed;					//!< A MenuItem attached to this menu opened a PopupMenu


	/*************************************************************************
		Accessor type functions
	*************************************************************************/
	/*!
	\brief
		Get the item spacing for this menu.

	\return
		A float value with the current item spacing for this menu
	*/
	float	getItemSpacing(void) const					{return d_itemSpacing;}


	/*!
	\brief
		Return whether this menu allows multiple popup menus to open at the same time.

	\return
		true if this menu allows multiple popup menus to be opened simultaneously. false if not
	*/
	bool	isMultiplePopupsAllowed(void) const			{return d_allowMultiplePopups;}


	/*!
	\brief
		Get currently opened MenuItem in this menu. Returns NULL if no menu item is open.

	\return
		Pointer to the MenuItem currently open.
	*/
	MenuItem*	getPopupMenuItem(void) const				{return d_popupItem;}


	/*************************************************************************
		Manipulators
	*************************************************************************/
	/*!
	\brief
		Set the item spacing for this menu.
	*/
	void	setItemSpacing(float spacing)				{d_itemSpacing=spacing; handleUpdatedItemData();}


	/*!
	\brief
		Change the currently open MenuItem in this menu.

	\param item
		Pointer to a MenuItem to open or NULL to close any opened.
	*/
	void	changePopupMenuItem(MenuItem* item);


	/*!
	\brief
		Set whether this menu allows multiple popup menus to be opened simultaneously.
	*/
	void	setAllowMultiplePopups(bool setting);


	/*************************************************************************
		Construction and Destruction
	*************************************************************************/
	/*!
	\brief
		Constructor for MenuBase objects
	*/
	MenuBase(const String& type, const String& name);


	/*!
	\brief
		Destructor for MenuBase objects
	*/
	virtual ~MenuBase(void);


protected:
	/*************************************************************************
		New Event Handlers
	*************************************************************************/
	/*!
	\brief
		handler invoked internally when the a MenuItem attached to this menu opens its popup.
	*/
	virtual void	onPopupOpened(WindowEventArgs& e);


	/*!
	\brief
		handler invoked internally when the a MenuItem attached to this menu closes its popup.
	*/
	virtual void	onPopupClosed(WindowEventArgs& e);


	/*************************************************************************
		Implementation Functions
	*************************************************************************/
	/*!
	\brief
		Return whether this window was inherited from the given class name at some point in the inheritance hierarchy.

	\param class_name
		The class name that is to be checked.

	\return
		true if this window was inherited from \a class_name. false if not.
	*/
	virtual bool	testClassName_impl(const String& class_name) const
	{
		if (class_name=="MenuBase")	return true;
		return ItemListBase::testClassName_impl(class_name);
	}


	/*************************************************************************
		Implementation Data
	*************************************************************************/
	float d_itemSpacing;		//!< The spacing in pixels between items.
	
	MenuItem* d_popupItem;	    //!< The currently open MenuItem. NULL if no item is open. If multiple popups are allowed, this means nothing.
	bool d_allowMultiplePopups;	//!< true if multiple popup menus are allowed simultaneously.  false if not.


private:
	/*************************************************************************
	Static Properties for this class
	*************************************************************************/
	static MenuBaseProperties::ItemSpacing			d_itemSpacingProperty;
	static MenuBaseProperties::AllowMultiplePopups	d_allowMultiplePopupsProperty;

	/*************************************************************************
	Private methods
	*************************************************************************/
	void	addMenuBaseProperties(void);
};

} // End of  CEGUI namespace section


#if defined(_MSC_VER)
#	pragma warning(pop)
#endif

#endif	// end of guard _CEGUIMenuBase_h_
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