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From 8b2c41af886b758126c7738fbd302fc1dfcc3172 Mon Sep 17 00:00:00 2001
From: Daniel Guihot <daniel@guihot.net>
Date: Wed, 16 Sep 2026 05:09:22 +1000
Subject: [PATCH] fullscreenhook: publish the fullscreen window on the root
window
Set _DWM_FULLSCREEN on the root window to the window id of the client
that is fullscreen and clear it when the client exits, so a compositor,
notification daemon or GameMode helper can react without scanning every
window. Assumes one fullscreen client at a time.
---
dwm.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/dwm.c b/dwm.c
index 53b393e..1868c5c 100644
--- a/dwm.c
+++ b/dwm.c
@@ -258,7 +258,7 @@ static void (*handler[LASTEvent]) (XEvent *) = {
[PropertyNotify] = propertynotify,
[UnmapNotify] = unmapnotify
};
-static Atom wmatom[WMLast], netatom[NetLast];
+static Atom wmatom[WMLast], netatom[NetLast], dwmfullscreen;
static int running = 1;
static Cur *cursor[CurLast];
static Clr **scheme;
@@ -1492,9 +1492,12 @@ setfullscreen(Client *c, int fullscreen)
c->isfloating = 1;
resizeclient(c, c->mon->mx, c->mon->my, c->mon->mw, c->mon->mh);
XRaiseWindow(dpy, c->win);
+ XChangeProperty(dpy, root, dwmfullscreen, XA_WINDOW, 32,
+ PropModeReplace, (unsigned char *)&c->win, 1);
} else if (!fullscreen && c->isfullscreen){
XChangeProperty(dpy, c->win, netatom[NetWMState], XA_ATOM, 32,
PropModeReplace, (unsigned char*)0, 0);
+ XDeleteProperty(dpy, root, dwmfullscreen);
c->isfullscreen = 0;
c->isfloating = c->oldstate;
c->bw = c->oldbw;
@@ -1579,6 +1582,7 @@ setup(void)
netatom[NetWMWindowType] = XInternAtom(dpy, "_NET_WM_WINDOW_TYPE", False);
netatom[NetWMWindowTypeDialog] = XInternAtom(dpy, "_NET_WM_WINDOW_TYPE_DIALOG", False);
netatom[NetClientList] = XInternAtom(dpy, "_NET_CLIENT_LIST", False);
+ dwmfullscreen = XInternAtom(dpy, "_DWM_FULLSCREEN", False);
/* init cursors */
cursor[CurNormal] = drw_cur_create(drw, XC_left_ptr);
cursor[CurResize] = drw_cur_create(drw, XC_sizing);
@@ -1783,6 +1787,8 @@ unmanage(Client *c, int destroyed)
detach(c);
detachstack(c);
+ if (c->isfullscreen)
+ XDeleteProperty(dpy, root, dwmfullscreen);
if (!destroyed) {
wc.border_width = c->oldbw;
XGrabServer(dpy); /* avoid race conditions */
--
2.55.0
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