playground/main.c

#include <stdio.h>
#include <unistd.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>

int main()
{
	Display *display = XOpenDisplay(NULL);
	Window main_window = XDefaultRootWindow(display);
	Window window = XCreateSimpleWindow(display, main_window, 0, 0, 250, 250, 1, 0, 0x00aade87);
	XMapWindow(display, window);
	XFlush(display);

	Atom WM_DELETE_WINDOW = XInternAtom(display, "WM_DELETE_WINDOW", False);
	if(!XSetWMProtocols(display, window, &WM_DELETE_WINDOW, 1)) 
	{
        	printf("Couldn't register WM_DELETE_WINDOW property \n");
	}

	int is_open = 1;
	while(is_open)
	{
		XEvent general_event = {};
        	XNextEvent(display, &general_event);

		switch(general_event.type)
		{
			case ClientMessage:
			{
	         		XClientMessageEvent *event = (XClientMessageEvent *) &general_event;
				if((Atom)event->data.l[0] == WM_DELETE_WINDOW) {
				    XDestroyWindow(display, window);
				    is_open = 0;
				    printf("Window destroyed \n");
				}
	              	} break;
		}
	}

	return 0;
}