main(int argc, char *argv[])
{
Display *display;
Window rootwindow, window;
int screen, x, y, width, height, count;
Visual *visual = CopyFromParent;
XEvent event;
display = (Display *) ConnectToServer((char *) NULL, &screen, &rootwindow);
x = y = 10;
width = height = 300;
window = OpenWindow(display, rootwindow, x, y, width, height,
BlackPixel(display, screen), WhitePixel(display, screen),
ExposureMask, visual);
SetStandardHints(display, window, argv[0], argv[0], x, y,
width, height);
XMapRaised(display, window);
XFlush(display);
count = 0;
while (count < 20)
{
XNextEvent(display, &event);
if (event.type == Expose)
{
count++;
printf("For Expose event %d,", count);
printf("the area is:\n");
printf("\tAt %d,%d,", event.xexpose.x,
event.xexpose.y);
printf(" %d pixels wide, %d high\n",
event.xexpose.width, event.xexpose.height);
}
}
XCloseDisplay(display);
}
main(int argc, char *argv[])
{
Display *display;
Window rootwindow, window;
int screen, x, y, width, height, count;
Visual *visual = CopyFromParent;
GC gc;
XEvent event;
display = ConnectToServer(NULL, &screen, &rootwindow);
x = y = 10;
width = height = 300;
window = OpenWindow(display, rootwindow, x, y, width, height,
BlackPixel(display, screen), WhitePixel(display, screen), ExposureMask,
visual);
SetStandardHints(display, window, argv[0], argv[0], x, y, width,
height);
gc = CreateGC(display, window, BlackPixel(display, screen),
WhitePixel(display, screen));
XMapRaised(display, window);
XFlush(display);
count = 0;
while (count < 20)
{
XNextEvent(display, &event);
if (event.type == Expose)
{
Redraw(display, window, gc);
count++;
}
}
XCloseDisplay(display);
}
// main routine
main(int argc, char **argv)
{
char string[BUFSIZ];
// connect to x-server
int screen;
Window rootwindow;
Display *display = ConnectToServer(NULL, screen, rootwindow);
if (display == NULL)
{
ERROR("connect to server failed.", EINVAL);
return(2);
}
// get basic colors
black = BlackPixel(display, screen);
white = WhitePixel(display, screen);
// create a window
Visual *visual = CopyFromParent;
int x = 10;
int y = 10;
int width = 300;
int height = 300;
Window window = OpenWindow(display,
rootwindow,
x, y, width, height,
black, white,
EVENT_MASK, visual);
// set hints for window
SetStandardHints(display, window, argv[0], argv[0],
x, y, width, height);
// create GC for drawing
GC gc = CreateGC(display, window, black, white);
// load a font
XFontStruct *font_struct =
LoadFont(display, FONT_NAME, FALLBACK_FONT_NAME);
// set up gc with font structure
XSetFont(display, gc, font_struct->fid);
// map window
XMapRaised(display, window);
XFlush(display);
// event loop: max of 20 events, then exit.
KeySym keysym;
XEvent event;
for (int done = False; done != True; )
{
XNextEvent(display, &event);
switch (event.type)
{
case Expose:
cout << "Expose: <x, y, w, h> = <";
cout << event.xexpose.x << ",";
cout << event.xexpose.y << ",";
cout << event.xexpose.width << ",";
cout << event.xexpose.height;
cout << ">" << endl;
if (event.xexpose.count == 0)
{
cout << "last expose event." << endl;
}
break;
case MapNotify:
cout << "MapNotify: window was mapped." << endl;
break;
case ButtonPress:
cout << "ButtonPress: ";
cout << ButtonIds[event.xbutton.button];
cout << " at <";
cout << event.xbutton.x << ",";
cout << event.xbutton.y << ">" << endl;
AppendKeyStateMessage(event.xbutton.state);
break;
case EnterNotify:
cout << "EnterNotify: pointer enters window" << endl;
break;
case LeaveNotify:
cout << "LeaveNotify: pointer enters window" << endl;
break;
case ButtonRelease:
cout << "ButtonRelease: ";
cout << ButtonIds[event.xbutton.button];
cout << " at <";
cout << event.xbutton.x << ",";
cout << event.xbutton.y << ">" << endl;
AppendKeyStateMessage(event.xbutton.state);
break;
case KeyPress:
done = DecodeKeyPress(&event.xkey, &keysym, string);
HandleKeyPress(&event.xkey, keysym, string);
break;
case ConfigureNotify:
cout << "ConfigureNotify: <x, y, w, h> = <";
cout << event.xconfigure.x << ",";
cout << event.xconfigure.y << ",";
cout << event.xconfigure.width << ",";
cout << event.xconfigure.height;
cout << ">" << endl;
break;
}
// redraw for all events.
if ( ! done) redraw(display, window, gc);
}
// close connection
XFreeFont(display, font_struct);
XCloseDisplay(display);
// all done
return(0);
}
