source: GTP/trunk/App/Demos/Geom/OgreStuff/include/CEGUI/CEGUIMouseCursor.h @ 1092

/************************************************************************
        filename:       CEGUIMouseCursor.h
        created:        21/2/2004
        author:         Paul D Turner
        
        purpose:        Defines interface for the MouseCursor class
*************************************************************************/
/*************************************************************************
    Crazy Eddie's GUI System (http://www.cegui.org.uk)
    Copyright (C)2004 - 2005 Paul D Turner (paul@cegui.org.uk)

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.

    This library 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
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*************************************************************************/
#ifndef _CEGUIMouseCursor_h_
#define _CEGUIMouseCursor_h_

#include "CEGUIBase.h"
#include "CEGUIString.h"
#include "CEGUISingleton.h"
#include "CEGUIVector.h"
#include "CEGUIRect.h"
#include "CEGUIEventSet.h"
#include "CEGUIInputEvent.h"


#if defined(_MSC_VER)
#       pragma warning(push)
#       pragma warning(disable : 4275)
#       pragma warning(disable : 4251)
#endif


// Start of CEGUI namespace section
namespace CEGUI
{

/*!
\brief
        Enumeration of special values used for mouse cursor settings in Window objects.
*/
enum MouseCursorImage
{               
        BlankMouseCursor        = 0,            //!< No image should be displayed for the mouse cursor.
        DefaultMouseCursor      = -1            //!< The default mouse cursor image should be displayed.
};


/*!
\brief
        Class that allows access to the GUI system mouse cursor.

        The MouseCursor provides functionality to access the position and imagery of the mouse cursor / pointer
*/
class CEGUIEXPORT MouseCursor : public EventSet, public Singleton<MouseCursor>
{
public:
        static const String EventNamespace;                             //!< Namespace for global events

        /*************************************************************************
                Event name constants
        *************************************************************************/
        // generated internally by MouseCursor
        static const String EventImageChanged;                  //!< The cursor image of the widget has changed.


        /*!
        \brief
                Constructor for MouseCursor objects
        */
        MouseCursor(void);


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


        /*!
        \brief
                Return singleton MouseCursor object

        \return
                Singleton MouseCursor object
        */
        static  MouseCursor&    getSingleton(void);


        /*!
        \brief
                Return pointer to singleton MouseCursor object

        \return
                Pointer to singleton MouseCursor object
        */
        static  MouseCursor*    getSingletonPtr(void);


        /*!
        \brief
                Set the current mouse cursor image

        \param imageset
                String object holding the name of the Imageset that contains the desired Image.

        \param image_name
                String object holding the name of the desired Image on Imageset \a imageset.

        \return
                Nothing.

        \exception UnknownObjectException       thrown if \a imageset is not known, or if \a imageset contains no Image named \a image_name.
        */
        void    setImage(const String& imageset, const String& image_name);


        /*!
        \brief
                Set the current mouse cursor image
        */
        void    setImage(const Image* image);


        /*!
        \brief
                Get the current mouse cursor image
        \return
                The current image used to draw mouse cursor.
        */
        const Image*    getImage(void) const    {return d_cursorImage;}


        /*!
        \brief
                Makes the cursor draw itself

        \return
                Nothing
        */
        void    draw(void) const;


        /*!
        \brief
                Set the current mouse cursor position

        \param position
                Point object describing the new location for the mouse.  This will be clipped to within the renderer screen area.
        */
        void    setPosition(const Point& position);


        /*!
        \brief
                Offset the mouse cursor position by the deltas specified in \a offset.

        \param offset
                Point object which describes the amount to move the cursor in each axis.

        \return
                Nothing.
        */
        void    offsetPosition(const Point& offset);


        /*!
        \brief
                Set the area that the mouse cursor is constrained to.

        \param area
                Pointer to a Rect object that describes the area of the display that the mouse is allowed to occupy.  The given area will be clipped to
                the current Renderer screen area - it is never possible for the mouse to leave this area.  If this parameter is NULL, the
                constraint is set to the size of the current Renderer screen area.

        \return
                Nothing.
        */
        void    setConstraintArea(const Rect* area);


        /*!
        \brief
                Hides the mouse cursor.

        \return
                Nothing.
        */
        void    hide(void)              {d_visible = false;}


        /*!
        \brief
                Shows the mouse cursor.

        \return
                Nothing.
        */
        void    show(void)              {d_visible = true;}


        /*!
        \brief
                return whether the mouse cursor is visible.

        \return
                true if the mouse cursor is visible, false if the mouse cursor is hidden.
        */
        bool    isVisible(void) const   {return d_visible;}


        /*!
        \brief
                Return the current mouse cursor position as a pixel offset from the top-left corner of the display.

        \return
                Point object describing the mouse cursor position in screen pixels.
        */
        Point   getPosition(void) const         {return Point(d_position.d_x, d_position.d_y);}


        /*!
        \brief
                return the current constraint area of the mouse cursor.

        \return
                Rect object describing the active area that the mouse cursor is constrained to.
        */
        Rect    getConstraintArea(void) const           {return d_constraints;}


        /*!
        \brief
                Return the current mouse cursor position as display resolution independant values.

        \return
                Point object describing the current mouse cursor position as resolution independant values that
                range from 0.0f to 1.0f, where 0.0f represents the left-most and top-most positions, and 1.0f
                represents the right-most and bottom-most positions.
        */
        Point   getDisplayIndependantPosition(void) const;


protected:
        /*************************************************************************
                New event handlers
        *************************************************************************/
        /*!
        \brief
                event triggered internally when image of mouse cursor changes
        */
        virtual void    onImageChanged(MouseCursorEventArgs& e);


        /*************************************************************************
                Implementation Functions
        *************************************************************************/
        /*!
        \brief
                Add mouse cursor specific events
        */
        void    addMouseCursorEvents(void);


private:
        /*************************************************************************
                Implementation Methods
        *************************************************************************/
        /*!
        \brief
                Checks the mouse cursor position is within the current 'constrain' Rect and adjusts as required.
        */
        void    constrainPosition(void);


        /*************************************************************************
                Implementation Data
        *************************************************************************/
        const Image*    d_cursorImage;          //!< Image that is currently set as the mouse cursor.
        Vector3 d_position;                                     //!< Current location of the cursor
        bool    d_visible;                                      //!< true if the cursor will be drawn, else false.
        Rect    d_constraints;                          //!< Specifies the area (in screen pixels) that the mouse can move around in.
};

} // End of  CEGUI namespace section

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

#endif  // end of guard _CEGUIMouseCursor_h_