April 1995/Designing a Cross-Platform GUI/Listing 1
gui.h
#ifndef _GUI_
#define _GUI_
#include <stdarg.h>
// platform specific includes and defines
#ifdef WIN_NT
#include <windows.h>
typedef HWND NativeWindow;
typedef HDC GraphicsHandle;
#define EXP1
#define EXP2 _declspec(dllexport)
#define NATIVE_PART_OF_GUI_APPLICATION HINSTANCE hInstance
#define NATIVE_PART_OF_GUI_WINDOW
#define NATIVE_FRIEND_OF_GUI_WINDOW friend LRESULT CALLBACK \
GuiWindowProc(HWND hWnd, UINT message, \
WPARAM uParam, LPARAM lParam)
#define main ApplicationMain
#endif
#ifdef OS2
#define INCL_WIN
#define INCL_GPI
#include <os2.h>
typedef HWND NativeWindow;
typedef HPS GraphicsHandle;
#define EXP1 _export
#define EXP2
#define NATIVE_PART_OF_GUI_APPLICATION HAB Hab; \
HMQ Hmq
#define NATIVE_PART_OF_GUI_WINDOW NativeWindow frame
#define NATIVE_FRIEND_OF_GUI_WINDOW friend MRESULT \
EXPENTRY GuiWindowProc(HWND hwnd, USHORT msg, \
MPARAM mp1, MPARAM mp2)
#endif
#ifdef X_WINDOWS
#include <X11/Intrinsic.h>
typedef Widget NativeWindow;
typedef GC GraphicsHandle;
#define EXP1
#define EXP2
#define NATIVE_PART_OF_GUI_APPLICATION int dontQuit
#define NATIVE_PART_OF_GUI_WINDOW NativeWindow frame; \
char szGeometry[100]
#define NATIVE_FRIEND_OF_GUI_WINDOW \
friend void ExposeCallback(Widget w, XtPointer client_data, \
XtPointer call_data); \
friend void ResizeCallback(Widget w, XtPointer client_data, \
XtPointer call_data)
#endif
// coordinate system definition
#define MAX_X 10000
#define MAX_Y 10000
#define MAX_WINDOW 100 // max. windows in an application
#define MAX_CHILDREN 100 // max. children of a window
// VGA colors
#define COLOR_WHITE 0
#define COLOR_BLACK 1
#define COLOR_BLUE 2
#define COLOR_RED 3
#define COLOR_PINK 4
#define COLOR_GREEN 5
#define COLOR_CYAN 6
#define COLOR_YELLOW 7
#define COLOR_NEUTRAL 8
#define COLOR_DARKGRAY 9
#define COLOR_DARKBLUE 10
#define COLOR_DARKRED 11
#define COLOR_DARKPINK 12
#define COL0R_DARKGREEN 13
#define COLOR_DARKCYAN 14
#define COLOR_BROWN 15
// object types returned by GetType()
#define TYPE_LINE 1
#define TYPE_ELLIPSE 2
#define TYPE_TEXT 3
#define TYPE_BUTTON 4
#define TYPE_ENTRY 5
#define TYPE_WINDOW 6
// the only global function: logs into a file
EXP2 void EXP1 Log(char* fmt, ...);
// forward declaration of classes GUI_WINDOW and GUI_OBJECT
class GUI_WINDOW;
class GUI_OBJECT;
typedef struct _GUI_WINDOW_ELEM { // typedef for linked list of windows
GUI_WINDOW* pWindow;
struct _GUI_WINDOW_ELEM* pNext;
} GUI_WINDOW_ELEM;
class EXP1 GUI_APPLICATION {
private:
NATIVE_PART_OF_GUI_APPLICATION;
GUI_WINDOW_ELEM WindowElemList[MAX_WINDOW], *pUsed, *pFree;
int AddWindow(GUI_WINDOW *pWindow);
int DelWindow(GUI_WINDOW *pWindow);
public:
EXP2 GUI_APPLICATION(int* pArgc, char** argv, char* logFile);
EXP2 virtual ~GUI_APPLICATION(void);
EXP2 void MainLoop(void);
EXP2 void Terminate(void);
EXP2 GUI_WINDOW* FindWindow(NativeWindow window);
EXP2 GUI_OBJECT* FindChild(NativeWindow window);
friend class GUI_WINDOW;
};
class EXP1 CALLABLE_OBJECT {
public:
EXP2 virtual int Activate(void) { return(1); }
EXP2 virtual int LeftClick(void) { return(1); }
EXP2 virtual int RightClick(void) { return(1); }
EXP2 virtual int LeftDoubleClick(void) { return(1); }
EXP2 virtual int RightDoubleClick(void) { return(1); }
};
class EXP1 GUI_OBJECT: public CALLABLE_OBJECT { // abstract class
protected:
GUI_WINDOW* pParent;
int id, x, y, width, height;
public:
EXP2 GUI_OBJECT(GUI_WINDOW* pParent, int id, int x=0, int y=0,
int width=MAX_X, int height=MAX_Y);
EXP2 virtual ~GUI_OBJECT(void);
EXP2 virtual int GetType(void)=0;
EXP2 virtual void Paint(GraphicsHandle gh) { }
EXP2 virtual NativeWindow GetNativeWindow(void) { return(0); }
EXP2 GUI_WINDOW* GetParent(void) { return(pParent); }
EXP2 int GetId(void) { return(id); }
EXP2 int GetX(void) { return(x); }
EXP2 int GetY(void) { return(y); }
EXP2 int GetWidth(void) { return(width); }
EXP2 int GetHeight(void) { return(height); }
};
class EXP1 GUI_GRAPHICS_OBJECT: public GUI_OBJECT { // abstract class
protected:
int color, lineWidth;
public:
EXP2 GUI_GRAPHICS_OBJECT(GUI_WINDOW* pParent, int id, int x=0,
int y=0,int width=MAX_X, int height=MAX_Y,
int color=COLOR_BLACK, int lineWidth=1);
EXP2 virtual ~GUI_GRAPHICS_OBJECT(void);
};
class EXP1 GUI_LINE: public GUI_GRAPHICS_OBJECT {
public:
EXP2 GUI_LINE(GUI_WINDOW* pParent, int id, int x1=0, int y1=0,
int x2=MAX_X, int y2=MAX_Y,
int color=COLOR_BLACK, int lineWidth=1);
EXP2 virtual ~GUI_LINE(void);
EXP2 virtual int GetType(void) { return(TYPE_LINE); }
EXP2 virtual void Paint(GraphicsHandle gh);
};
// fill types
#define FILL_OUTER 0 // draw just the otline
#define FILL_SOLID 1 // draw and fill the shape
class EXP1 GUI_ELLIPSE: public GUI_GRAPHICS_OBJECT { // abstract class
protected:
int fillType;
public:
EXP2 GUI_ELLIPSE(GUI_WINDOW* pParent, int id, int x=0, int y=0,
int width=MAX_X/2, int height=MAX_Y/2,
int color=COLOR_BLACK, int fillType=FILL_OUTER,
int lineWidth=1);
EXP2 virtual ~GUI_ELLIPSE(void);
EXP2 virtual int GetType(void) { return(TYPE_ELLIPSE); }
EXP2 virtual void Paint(GraphicsHandle gh);
};
class EXP1 GUI_WINDOW_OBJECT: public GUI_OBJECT { // abstract class
protected:
NativeWindow window;
public:
EXP2 GUI_WINDOW_OBJECT(GUI_WINDOW* pParent, int id, int x=0,
int y=0, int width=MAX_X, int height=MAX_Y);
EXP2 virtual ~GUI_WINDOW_OBJECT(void);
EXP2 NativeWindow GetNativeWindow(void) { return(window); }
EXP2 virtual void GetRealCoordinates(int *pRx, int *pRy,
int *pRw, int *pRh);
EXP2 virtual int GetText(char *buffer, int bufferLength);
EXP2 virtual int SetText(char *text="");
};
class EXP1 GUI_TEXT: public GUI_WINDOW_OBJECT {
public:
EXP2 GUI_TEXT(GUI_WINDOW* pParent, int id, int x=0, int y=0,
int width=MAX_X, int height=0,
char *text="");
EXP2 virtual int GetType(void) { return(TYPE_TEXT); }
};
class EXP1 GUI_BUTTON: public GUI_WINDOW_OBJECT {
public:
EXP2 GUI_BUTTON(GUI_WINDOW* pParent, int id, int x=0, int y=0,
int width=MAX_X, int height=0, char* text="");
EXP2 virtual int GetType(void) { return(TYPE_BUTTON; }
};
class EXP1 GUI_ENTRY: public GUI_WINDOW_OBJECT {
protected:
int length;
public:
EXP2 GUI_ENTRY(GUI_WINDOW* pParent, int id, int x=0, int y=0,
int width=MAX_X, int height=0,
char* text="", int maxTextLength=10);
EXP2 virtual int GetType(void) { return(TYPE_ENTRY); }
#ifdef X_WINDOWS // if not under X_WINDOWS these are inherited from
// GUI_WINDOW_OBJECT
EXP2 virtual int GetText(char *buffer, int bufferLength);
EXP2 virtual int SetText(char *text="");
#endif
};
// frame styles
#define FRAME_THIN 1
#define FRAME_SIZEABLE 2
#define FRAME_TITLE 4
#define FRAME_MIN_BUTTON 8
#define FRAME_MAX_BUTTON 16
#define FRAME_DEFAULT (FRAME_THIN | FRAME_TITLE)
typedef struct _GUI_OBJECT_ELEM { // typedef for linked list of children
GUI_OBJECT* pObject;
struct _GUI_OBJECT_ELEM* pNext;
} GUI_OBJECT_ELEM;
class EXP1 GUI_WINDOW: public GUI_WINDOW_OBJECT {
private:
NATIVE_PART_OF_GUI_WINDOW;
GUI_APPLICATION* pApplication;
GraphicsHandle gh;
int frameStyle, backgroundColor;
GUI_OBJECT_ELEM Children[MAX_CHILDREN], *pUsed, *pFree;
protected:
EXP2 void SizeChildren(void);
EXP2 int AddChild(GUI_OBJECT* pChild);
EXP2 int DeleteChild(GUI_OBJECT* pChild);
public:
EXP2 GUI_WINDOW(GUI_APPLICATION* pApplication, int id, int x=0,
int y=0, int width=MAX_X, int height=MAX_Y,
int backgroundColor=COLOR_WHITE, char* title= "",
int frameStyle=FRAME_DEFAULT);
EXP2 virtual ~GUI_WINDOW(void);
EXP2 virtual int GetType(void) { return(TYPE_WINDOW); }
EXP2 virtual void Paint(GraphicsHandle gh);
EXP2 virtual void Show(void);
EXP2 int GetBackground(void) {return(backgroundColor); }
EXP2 GraphicsHandle GetGraphicsHandle(void) { return(gh); }
EXP2 GUI_OBJECT* GetChildFromId(int id);
EXP2 GUI_OBJECT* GetChildFromWindow(NativeWindow window);
#ifndef WIN_NT // if under Windows these are inherited from GUI_WINDOW_OBJECT
EXP2 virtual int GetText(char *buffer, int bufferLength);
EXP2 virtual int SetText(char *text="");
#endif
EXP2 virtual void Message(char *title, char *text);
// return value 0=OK, 1=Cancel
EXP2 virtual int Question(char *title, char *text);
friend class GUI_APPLICATION;
friend class GUI_OBJECT;
NATIVE_FRIEND_OF_GUI_WINDOW;
};
#endif // #ifndef _GUI_
/* End of File */
