React to ConfigureNotify

events.c

@@ -30,6 +30,10 @@ void on_expose(app_t *app, XEvent *ev) {
 }
 
 void on_configurenotify(app_t *app, XEvent *ev) {
+	if (app == NULL || ev == NULL)
+		return;
+	
+	win_configure(&app->win, &ev->xconfigure);
 }
 
 void on_keypress(app_t *app, XEvent *ev) {

window.c

@@ -84,3 +84,19 @@ void win_close(win_t *win) {
 	XFreeGC(dpy, gc);
 	XCloseDisplay(dpy);
 }
+
+int win_configure(win_t *win, XConfigureEvent *cev) {
+	int changed;
+
+	if (win == NULL)
+		return 0;
+	
+	changed = win->x != cev->x || win->y != cev->y ||
+			win->w != cev->width || win->h != cev->height;
+	win->x = cev->x;
+	win->y = cev->y;
+	win->w = cev->width;
+	win->h = cev->height;
+	win->bw = cev->border_width;
+	return changed;
+}

window.h

@@ -33,7 +33,9 @@ typedef struct win_s {
 	int fullscreen;
 } win_t;
 
-void win_open(win_t *win);
-void win_close(win_t *win);
+void win_open(win_t*);
+void win_close(win_t*);
+
+int win_configure(win_t*, XConfigureEvent*);
 
 #endif /* WINDOW_H */