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// xfocus.c - print the current X input focus and the gzdoom window, and try
// to focus the gzdoom window; then report again. Diagnostic for WM-less X.
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <stdio.h>
#include <string.h>
static Window find_named(Display *d, Window root, const char *sub,
char *title, size_t tl)
{
Window r, parent, *kids = NULL;
unsigned int nk = 0;
title[0] = 0;
if (!XQueryTree(d, root, &r, &parent, &kids, &nk))
return 0;
for (unsigned int i = 0; i < nk; i++) {
char *name = NULL;
if (XFetchName(d, kids[i], &name) && name) {
if (strstr(name, sub)) {
snprintf(title, tl, "%s", name);
Window w = kids[i];
XFree(name);
if (kids)
XFree(kids);
return w;
}
XFree(name);
}
}
if (kids)
XFree(kids);
return 0;
}
int main(void)
{
Display *d = XOpenDisplay(NULL);
Window root, focus, w, croot;
int rx, ry, wx, wy;
unsigned int mask;
char title[256];
if (!d) {
printf("no display\n");
return 1;
}
root = DefaultRootWindow(d);
w = find_named(d, root, "Freedoom", title, sizeof(title));
XGetInputFocus(d, &focus, &rx);
printf("gzdoom window: 0x%lx '%s'\n", w, title);
printf("input focus: 0x%lx\n", focus);
printf("pointer window: ");
if (XQueryPointer(d, root, &croot, &rx /*reuse*/, &wx, &wy, &rx, &ry,
&mask))
printf("0x%lx at %d,%d mask=0x%x\n", rx, wx, wy, mask);
else
printf("query failed\n");
if (w) {
XSetInputFocus(d, w, RevertToParent, CurrentTime);
XFlush(d);
XGetInputFocus(d, &focus, &rx);
printf("after set: 0x%lx\n", focus);
}
XCloseDisplay(d);
return 0;
}
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