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路径: \\game3dprogramming\materials\GameFactory\GameFactoryDemo\references\ogre\include\CEGUI\elements\CEGUIMenuItem.h
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/***********************************************************************
	filename: 	CEGUIMenuItem.h
	created:	2/4/2005
	author:		Tomas Lindquist Olsen (based on code by Paul D Turner)
	
	purpose:	Interface to base class for MenuItem 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 _CEGUIMenuItem_h_
#define _CEGUIMenuItem_h_

#include "CEGUIBase.h"
#include "CEGUIWindow.h"
#include "elements/CEGUIItemEntry.h"

// Start of CEGUI namespace section
namespace CEGUI
{

/*!
\brief
	Base class for menu items.
*/
class CEGUIEXPORT MenuItem : public ItemEntry
{
public:
	static const String EventNamespace;				//!< Namespace for global events
    static const String WidgetTypeName;             //!< Window factory name

	/*************************************************************************
		Event name constants
	*************************************************************************/
	// generated internally by Window
	static const String EventClicked;					//!< The menu item was clicked.


	/*************************************************************************
		Accessor type functions
	*************************************************************************/
	/*!
	\brief
		return true if user is hovering over this widget (or it's pushed and user is not over it for highlight)

	\return
		true if the user is hovering or if the button is pushed and the mouse is not over the button.  Otherwise return false.
	*/
	bool	isHovering(void) const			{return d_hovering;}


	/*!
	\brief
		Return true if the button widget is in the pushed state.

	\return
		true if the button-type widget is pushed, false if the widget is not pushed.
	*/
	bool	isPushed(void) const			{return d_pushed;}


    /*!
    \brief
        Returns true if the popup menu attached to the menu item is open.
    */
    bool    isOpened(void) const            {return d_opened;}


	/*!
	\brief
		Get the PopupMenu that is currently attached to this MenuItem.

	\return
		A pointer to the currently attached PopupMenu.  Null is there is no PopupMenu attached.
	*/
	PopupMenu*	getPopupMenu(void) const			{return d_popup;}


	/*************************************************************************
		Manipulators
	*************************************************************************/
	/*!
	\brief
		Set the popup menu for this item.

	\param popup
		popupmenu window to attach to this item

	\return
		Nothing.
	*/
	void	setPopupMenu(PopupMenu* popup);


	/*!
	\brief
		Opens the PopupMenu.

    \param notify
		true if the parent menu bar or menu popup (if any) is to handle the open.
	*/
	void	openPopupMenu(bool notify=true);


	/*!
	\brief
		Closes the PopupMenu.

	\param notify
		true if the parent menubar (if any) is to handle the close.

	\return
		Nothing.
	*/
	void	closePopupMenu(bool notify=true);


	/*!
	\brief
		Toggles the PopupMenu.

	\return
		true if the popup was opened. false if it was closed.
	*/
	bool	togglePopupMenu(void);


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


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


protected:
	/*************************************************************************
		New Event Handlers
	*************************************************************************/
	/*!
	\brief
		handler invoked internally when the MenuItem is clicked.
	*/
	virtual void	onClicked(WindowEventArgs& e);


	/*************************************************************************
		Overridden event handlers
	*************************************************************************/
	virtual void	onMouseMove(MouseEventArgs& e);
	virtual void	onMouseButtonDown(MouseEventArgs& e);
	virtual void	onMouseButtonUp(MouseEventArgs& e);
	virtual void	onCaptureLost(WindowEventArgs& e);
	virtual void	onMouseLeaves(MouseEventArgs& e);
	virtual void    onTextChanged(WindowEventArgs& e);


	/*************************************************************************
		Implementation Functions
	*************************************************************************/
	/*!
	\brief
		Update the internal state of the widget with the mouse at the given position.

	\param mouse_pos
		Point object describing, in screen pixel co-ordinates, the location of the mouse cursor.

	\return
		Nothing
	*/
	void	updateInternalState(const Point& mouse_pos);


	/*!
	\brief
		Recursive function that closes all popups down the hierarcy starting with this one.

	\return
		Nothing.
	*/
	void	closeAllMenuItemPopups();


    /*!
	\brief
		Set the popup menu for this item.

	\param popup
		popupmenu window to attach to this item

	\return
		Nothing.
	*/
	void	setPopupMenu_impl(PopupMenu* popup,bool add_as_child=true);


	/*!
	\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=="MenuItem")	return true;
		return ItemEntry::testClassName_impl(class_name);
	}


	/*************************************************************************
		Implementation Data
	*************************************************************************/
	bool d_pushed;			//!< true when widget is pushed
	bool d_hovering;		//!< true when the button is in 'hover' state and requires the hover rendering.
	bool d_opened;			//!< true when the menu item's popup menu is in its opened state.

	PopupMenu*  d_popup;	//!< PopupMenu that this item displays when activated.

	bool d_popupWasClosed;	//!< Used internally to determine if a popup was just closed on a Clicked event


private:
    /*************************************************************************
		Private methods
	*************************************************************************/
	void addMenuItemProperties(void);


	/*!
	\brief
		Add given window to child list at an appropriate position
	*/
	virtual void	addChild_impl(Window* wnd);
};

} // End of  CEGUI namespace section

#endif	// end of guard _CEGUIMenuItem_h_
CEGUIMenuItem.h
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