Shamusworld >> Repos - apple2/blob - apple2/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 "types.h"
  17
  18 class Element
  19 {
  20         public:
  21                 Element(uint32 x = 0, uint32 y = 0, uint32 w = 0, uint32 h = 0,
  22                         Element * parentElement = NULL);
  23                 Element(uint32 x, uint32 y, uint32 w, uint32 h,
  24                         uint8 fgR = 0xFF, uint8 fgG = 0xFF, uint8 fgB = 0xFF, uint8 fgA = 0xFF,
  25                         uint8 bgR = 0x00, uint8 bgG = 0x00, uint8 bgB = 0x00, uint8 bgA = 0xFF,
  26                         Element * parentElement = NULL);
  27                 virtual ~Element();                                                     // Destructor cannot be pure virtual...
  28                 virtual void HandleKey(SDLKey key) = 0;         // These are "pure" virtual functions...
  29                 virtual void HandleMouseMove(uint32 x, uint32 y) = 0;
  30                 virtual void HandleMouseButton(uint32 x, uint32 y, bool mouseDown) = 0;
  31                 virtual void Draw(void) = 0;
  32                 virtual void Notify(Element *) = 0;
  33                 bool Inside(uint32 x, uint32 y);
  34 //Badly named, though we may code something that does this...
  35 //              SDL_Rect GetParentCorner(void);
  36                 SDL_Rect GetScreenCoords(void);
  37 #if 0
  38 //May use this in the future...
  39                 SDL_Rect GetParentRect(void);
  40 #endif
  41                 void CreateBackstore(void);
  42                 void RestoreScreenFromBackstore(void);
  43                 // Class methods...
  44                 static void SetScreen(SDL_Surface *);
  45                 static bool ScreenNeedsRefreshing(void);
  46                 static void ScreenWasRefreshed(void);
  47
  48         protected:
  49                 SDL_Rect extents;
  50                 uint32 state;
  51                 Element * parent;
  52                 uint32 fgColor;
  53                 uint32 bgColor;
  54                 SDL_Surface * backstore;
  55
  56                 // Class variables...
  57                 static SDL_Surface * screen;
  58                 static bool needToRefreshScreen;
  59 };
  60
  61 #endif  // __ELEMENT_H__