Shamusworld >> Repos - apple2/blob - src/gui/element.h

   1 //
   2 // ELEMENT.H
   3 //
   4 // Graphical User Interface base class
   5 // All GUI elements are derived from this base class.
   6 //
   7
   8 #ifndef __ELEMENT_H__
   9 #define __ELEMENT_H__
  10
  11 // These are various GUI messages that can be sent to the SDL event handler
  12
  13 enum { WINDOW_CLOSE, MENU_ITEM_CHOSEN, SCREEN_REFRESH_NEEDED };
  14
  15 #include <SDL.h>
  16 #include <list>
  17 #include "types.h"
  18
  19 class Element
  20 {
  21         public:
  22                 Element(uint32 x = 0, uint32 y = 0, uint32 w = 0, uint32 h = 0,
  23                         Element * parentElement = NULL);
  24                 Element(uint32 x, uint32 y, uint32 w, uint32 h,
  25                         uint8 fgR = 0xFF, uint8 fgG = 0xFF, uint8 fgB = 0xFF, uint8 fgA = 0xFF,
  26                         uint8 bgR = 0x00, uint8 bgG = 0x00, uint8 bgB = 0x00, uint8 bgA = 0xFF,
  27                         Element * parentElement = NULL);
  28                 virtual ~Element();                                                     // Destructor cannot be pure virtual...
  29                 virtual void HandleKey(SDLKey key) = 0;         // These are "pure" virtual functions...
  30                 virtual void HandleMouseMove(uint32 x, uint32 y) = 0;
  31                 virtual void HandleMouseButton(uint32 x, uint32 y, bool mouseDown) = 0;
  32                 virtual void Draw(void) = 0;
  33                 virtual void Notify(Element *) = 0;
  34                 bool Inside(uint32 x, uint32 y);
  35 //Badly named, though we may code something that does this...
  36 //              SDL_Rect GetParentCorner(void);
  37                 SDL_Rect GetScreenCoords(void);
  38                 SDL_Rect GetExtents(void);
  39 #if 1
  40 //May use this in the future...
  41                 SDL_Rect GetParentRect(void);
  42 #endif
  43                 void CreateBackstore(void);
  44                 void RestoreScreenFromBackstore(void);
  45                 void SaveScreenToBackstore(void);
  46                 void ResetCoverageList(void);
  47 //Need something to prevent this on Elements that don't have mouseover effects...
  48                 void AdjustCoverageList(SDL_Rect r);
  49                 // Class methods...
  50                 static void SetScreen(SDL_Surface *);
  51                 static bool ScreenNeedsRefreshing(void);
  52                 static void ScreenWasRefreshed(void);
  53
  54         protected:
  55                 SDL_Rect extents;
  56                 uint32 state;
  57                 Element * parent;
  58                 uint32 fgColor;
  59                 uint32 bgColor;
  60                 SDL_Surface * backstore;
  61                 std::list<SDL_Rect> coverList;
  62
  63                 // Class variables...
  64                 static SDL_Surface * screen;
  65                 static bool needToRefreshScreen;
  66 };
  67
  68 #endif  // __ELEMENT_H__