CMakeLua/Tests/X11/HelloWorldX11.cxx

   1
   2 /*** START MAIN.H ***/
   3 /* http://www.geocities.com/jeff_louie/x11/helloworld.htm* */
   4 /*
   5  *  main.h
   6  *  TestX
   7  *
   8  *  Created by Jeff Louie on Tue Feb 03 2004.
   9  *  Copyright (c) 2004 __MyCompanyName__. All rights reserved.
  10  *
  11  */
  12
  13
  14 #ifndef MAIN_H
  15 #define MAIN_H 1
  16
  17 #include <iostream>
  18
  19 /* include the X library headers */
  20 #include <X11/Xlib.h>
  21 #include <X11/Xutil.h>
  22 #include <X11/Xos.h>
  23
  24 class Main {
  25
  26 public:
  27   // constructor
  28   Main(int argc, char * const argv[]);
  29   //virtual ~Main();
  30
  31
  32 private:
  33
  34
  35   /* here are our X variables */
  36   Display *dis;
  37   int screen;
  38   Window win;
  39   GC gc;
  40
  41   /* here are our X routines declared! */
  42   void init_x();
  43   void close_x();
  44   void redraw();
  45   int delay(int i);
  46
  47 };
  48
  49 #endif
  50
  51 /*** END MAIN.H ***/
  52
  53 /*** START MAIN.CPP ***/
  54
  55 // modified from Brian Hammond's Howdy program at
  56 // http://www.insanityengine.com/doc/x11/xintro.html
  57 // jeff louie 02.05.2004
  58
  59
  60
  61 int main (int argc, char * const argv[]) {
  62   Main m(argc, argv);
  63   return 0;
  64 }
  65
  66 //Main::~Main() {;};
  67 Main::Main (int argc, char * const argv[]) {
  68   XEvent event;           // XEvent declaration
  69   KeySym key;             // KeyPress Events
  70   char text[255];         // char buffer for KeyPress Events
  71
  72   init_x();
  73
  74   // event loop
  75   while(1) {
  76   // get the next event and stuff it into our event variable.
  77   // Note:  only events we set the mask for are detected!
  78   XNextEvent(dis, &event);
  79
  80
  81   switch (event.type) {
  82   int x;
  83   int y;
  84   case Expose:
  85     if (event.xexpose.count==0) {
  86     redraw();
  87     }
  88     break;
  89   case KeyPress:
  90     if (XLookupString(&event.xkey,text,255,&key,0)==1) {
  91     // use the XLookupString routine to convert the invent
  92     // KeyPress data into regular text.  Weird but necessary...
  93     if ((text[0]=='q') || (text[0]=='Q')) {
  94     close_x();
  95     }
  96     else {
  97     // echo key press
  98     printf("You pressed the %c key!\n",text[0]);
  99     }
 100     }
 101     break;
 102   case ButtonPress:
 103     // get cursor position
 104     x= event.xbutton.x;
 105     y= event.xbutton.y;
 106     strcpy(text,"X is FUN!");
 107     XSetForeground(dis,gc,rand()%event.xbutton.x%255);
 108     // draw text at cursor
 109     XDrawString(dis,win,gc,x,y, text, strlen(text));
 110     break;
 111   default:
 112     printf("Unhandled event.\n");
 113   }
 114   }
 115 }
 116
 117 void Main::init_x() {
 118   unsigned long black,white;
 119
 120   dis=XOpenDisplay(NULL);
 121   screen=DefaultScreen(dis);
 122   black=BlackPixel(dis,screen),
 123     white=WhitePixel(dis, screen);
 124   win=XCreateSimpleWindow(dis,DefaultRootWindow(dis),0,0,
 125                           300, 300, 5,black, white);
 126   XSetStandardProperties(dis,win,"Hello World","Hi",None,NULL,0,NULL);
 127   XSelectInput(dis, win, ExposureMask|ButtonPressMask|KeyPressMask);
 128   // get Graphics Context
 129   gc=XCreateGC(dis, win, 0,0);
 130   XSetBackground(dis,gc,white);
 131   XSetForeground(dis,gc,black);
 132   XClearWindow(dis, win);
 133   XMapRaised(dis, win);
 134 };
 135
 136 void Main::close_x() {
 137   XFreeGC(dis, gc);
 138   XDestroyWindow(dis,win);
 139   XCloseDisplay(dis);
 140   exit(1);
 141 };
 142
 143 void Main::redraw() {
 144   XClearWindow(dis, win);
 145 };