pgwidgetdnd.h

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/*
    ParaGUI - crossplatform widgetset
    Copyright (C) 2000,2001,2002  Alexander Pipelka
 
    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License as published by the Free Software Foundation; either
    version 2 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
    Library General Public License for more details.
 
    You should have received a copy of the GNU Library General Public
    License along with this library; if not, write to the Free
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 
    Alexander Pipelka
    pipelka@teleweb.at
 
    Last Update:      $Author: mbickel $
    Update Date:      $Date: 2007-04-13 16:15:57 $
    Source File:      $Source: /home/cvspsrv/cvsroot/games/asc/source/libs/paragui/include/pgwidgetdnd.h,v $
    CVS/RCS Revision: $Revision: 1.2 $
    Status:           $State: Exp $
*/

#ifndef PG_WIDGETDND_H
#define PG_WIDGETDND_H

#include "pgwidget.h"

class DECLSPEC PG_WidgetDnD : public PG_Widget  {
public:

        PG_WidgetDnD(PG_Widget* parent, int dndID, const PG_Rect& r);

        PG_WidgetDnD(PG_Widget* parent, int dndID, const PG_Rect& r, bool bCreateSurface);

        ~PG_WidgetDnD();

        bool GetDrop();

        bool GetDrag();

        void RemoveObjectDnD(PG_WidgetDnD* obj);

        void SetDrop(bool drop);

        void SetDrag(bool drag);

        void updateDragArea(PG_Point pt, SDL_Surface* image);

        void drawDragArea(PG_Point pt, SDL_Surface* image);

protected: // Protected methods

        PG_WidgetDnD* FindDropTarget(PG_Point pt);

        bool eventMouseButtonDown(const SDL_MouseButtonEvent* button);

        bool eventMouseMotion(const SDL_MouseMotionEvent* motion);

        bool eventMouseButtonUp(const SDL_MouseButtonEvent* button);

        virtual bool AcceptDrop(PG_WidgetDnD* source, int dndID);

        virtual bool eventDragStart();

        virtual bool eventDragDrop(PG_WidgetDnD* source, int dndID);

        virtual bool eventDragCancel();

        virtual SDL_Surface* eventQueryDragImage();

        virtual SDL_Surface* eventQueryDropImage(SDL_Surface* dragimage = NULL);

        PG_WidgetDnD* dnd_next;
        static PG_WidgetDnD* dnd_objectlist;

private:

        DLLLOCAL void cacheDragArea(PG_Point p);

        DLLLOCAL void restoreDragArea(PG_Point p);

        DLLLOCAL void CheckCursorPos(int& x, int& y);

        DLLLOCAL void slideDragImage(PG_Point start, PG_Point end, int steps, SDL_Surface* image);

        bool CanDrag;

        bool CanDrop;

        bool Draging;

        PG_Point dragPointStart;

        PG_Point dragPointOld;

        PG_Point dragPointCurrent;

        SDL_Surface* dragimage;

        SDL_Surface* dragimagecache;

private: // disable the copy operators

        PG_WidgetDnD(const PG_WidgetDnD&);
        PG_WidgetDnD& operator=(const PG_WidgetDnD&);

};

#endif // PG_WIDGETDND_H

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