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sdlwidgetdnd.h

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00001 /*
00002     ParaGUI - crossplatform widgetset
00003     Copyright (C) 2000  Alexander Pipelka
00004  
00005     This library is free software; you can redistribute it and/or
00006     modify it under the terms of the GNU Library General Public
00007     License as published by the Free Software Foundation; either
00008     version 2 of the License, or (at your option) any later version.
00009  
00010     This library is distributed in the hope that it will be useful,
00011     but WITHOUT ANY WARRANTY; without even the implied warranty of
00012     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00013     Library General Public License for more details.
00014  
00015     You should have received a copy of the GNU Library General Public
00016     License along with this library; if not, write to the Free
00017     Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
00018  
00019     Alexander Pipelka
00020     pipelka@teleweb.at
00021  
00022     Last Update:      $Author: pipelka $
00023     Update Date:      $Date: 2001/01/31 17:23:17 $
00024     Source File:      $Source: /usr/local/CVSROOT/linux/paragui/doc/html/sdlwidgetdnd_h-source.html,v $
00025     CVS/RCS Revision: $Revision: 1.34 $
00026     Status:           $State: Exp $
00027 */
00028 
00029 #ifndef SDLWIDGETDND_H
00030 #define SDLWIDGETDND_H
00031 
00032 #ifdef SWIG
00033 %include "swigcommon.h"
00034 %module sdlwidgetdnd
00035 %{
00036 #include "sdlwidgetdnd.h"
00037 %}
00038 #endif
00039 
00040 #include "sdlwidget.h"
00041 
00052 class DECLSPEC SDLWidgetDnD : public SDLWidget  {
00053 public:
00054 
00055     SDLWidgetDnD(SDLWidget* parent, int dndID, SDL_Rect& r);
00056     ~SDLWidgetDnD();
00057 
00059     bool GetDrop();
00060 
00062     bool GetDrag();
00063 
00065     void RemoveObjectDnD(SDLWidgetDnD* obj);
00066 
00068     void SetDrop(bool drop);
00069 
00071     void SetDrag(bool drag);
00072 
00074     void updateDragArea(SDL_Point pt, SDL_Surface* image);
00075 
00077     void drawDragArea(SDL_Point pt, SDL_Surface* image);
00078 
00079 protected: // Protected methods
00080 
00082     SDLWidgetDnD* FindDropTarget(SDL_Point pt);
00083 
00085     bool eventMouseButtonDown(const SDL_MouseButtonEvent* button);
00086 
00088     bool eventMouseMotion(const SDL_MouseMotionEvent* motion);
00089 
00091     bool eventMouseButtonUp(const SDL_MouseButtonEvent* button);
00092 
00094     virtual bool AcceptDrop(SDLWidgetDnD* source, int dndID);
00095 
00097     virtual bool eventDragStart();
00098 
00100     virtual bool eventDragDrop(SDLWidgetDnD* source, int dndID);
00101 
00103     virtual bool eventDragCancel();
00104 
00106     virtual SDL_Surface* eventQueryDragImage();
00107 
00109     virtual SDL_Surface* eventQueryDropImage(SDL_Surface* dragimage = NULL);
00110 
00111     SDLWidgetDnD* dnd_next;
00112     static SDLWidgetDnD* dnd_objectlist;
00113 
00114 private:
00115 
00117     void cacheDragArea(SDL_Point p);
00118 
00120     void restoreDragArea(SDL_Point p);
00121 
00123     void CheckCursorPos(int& x, int& y);
00124 
00126     void slideDragImage(SDL_Point start, SDL_Point end, int steps, SDL_Surface* image);
00127 
00128     bool        CanDrag;
00129     bool        CanDrop;
00130     bool        Draging;
00131     SDL_Point dragPointStart;
00132     SDL_Point dragPointOld;
00133     SDL_Point dragPointCurrent;
00134     SDL_Surface* dragimage;
00135     SDL_Surface* dragimagecache;
00136 
00137 private: // disable the copy operators
00138     SDLWidgetDnD(const SDLWidgetDnD&);
00139     SDLWidgetDnD& operator=(const SDLWidgetDnD&);
00140 };
00141 
00142 #endif // SDLWIDGETDND_H