From 4e33fe0d465fb24f6b42d4a1fb63d4d7902f1986 Mon Sep 17 00:00:00 2001
From: Gunther Klessinger <gunther.klessinger@axiros.com>
Date: Thu, 1 Jul 2021 09:19:07 +0200
Subject: [PATCH] Supporting xfce4-panel in dwm

We treat the panel as special window which
- never has borders
- never has focus
- always has y=0
- is never shown as active window in the indicators
- is shown on all tags (via config rule)
- is ignored on focusstack (MOD+j, MOD+k)

Which window? "xfce4-panel" - configurable in config.h
---
 config.def.h |  2 ++
 dwm.c        | 28 +++++++++++++++++++++-------
 2 files changed, 23 insertions(+), 7 deletions(-)

diff --git a/config.def.h b/config.def.h
index 1c0b587..3b9e7d6 100644
--- a/config.def.h
+++ b/config.def.h
@@ -3,6 +3,7 @@
 /* appearance */
 static const unsigned int borderpx  = 1;        /* border pixel of windows */
 static const unsigned int snap      = 32;       /* snap pixel */
+static const char panel[][20]       = { "xfce4-panel", "Xfce4-panel" }; /* name & cls of panel win */
 static const int showbar            = 1;        /* 0 means no bar */
 static const int topbar             = 1;        /* 0 means bottom bar */
 static const char *fonts[]          = { "monospace:size=10" };
@@ -29,6 +30,7 @@ static const Rule rules[] = {
	/* class      instance    title       tags mask     isfloating   monitor */
	{ "Gimp",     NULL,       NULL,       0,            1,           -1 },
	{ "Firefox",  NULL,       NULL,       1 << 8,       0,           -1 },
+	{ panel[1],   NULL,       NULL,       (1 << 9) - 1, 0,           -1 },
 };

 /* layout(s) */
diff --git a/dwm.c b/dwm.c
index b0b3466..956d402 100644
--- a/dwm.c
+++ b/dwm.c
@@ -175,6 +175,7 @@ static long getstate(Window w);
 static int gettextprop(Window w, Atom atom, char *text, unsigned int size);
 static void grabbuttons(Client *c, int focused);
 static void grabkeys(void);
+static int ispanel(Client *c);
 static void incnmaster(const Arg *arg);
 static void keypress(XEvent *e);
 static void killclient(const Arg *arg);
@@ -710,6 +711,8 @@ drawbar(Monitor *m)
	}
 
	for (c = m->clients; c; c = c->next) {
+        // prevent showing the panel as active application:
+        if (ispanel(c)) continue;
		occ |= c->tags;
		if (c->isurgent)
			urg |= c->tags;
@@ -793,11 +796,14 @@ focus(Client *c)
			selmon = c->mon;
		if (c->isurgent)
			seturgent(c, 0);
-		detachstack(c);
-		attachstack(c);
-		grabbuttons(c, 1);
-		XSetWindowBorder(dpy, c->win, scheme[SchemeSel][ColBorder].pixel);
-		setfocus(c);
+        // prevents the panel getting focus when tag switching:
+		if (!ispanel(c)) {
+            detachstack(c);
+            attachstack(c);
+            grabbuttons(c, 1);
+            XSetWindowBorder(dpy, c->win, scheme[SchemeSel][ColBorder].pixel);
+            setfocus(c);
+        }
	} else {
		XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
		XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
@@ -853,6 +859,7 @@ focusstack(const Arg *arg)
	if (c) {
		focus(c);
		restack(selmon);
+        if (ispanel(c)) focusstack(arg);
	}
 }

@@ -964,6 +971,11 @@ grabkeys(void)
	}
 }

+int
+ispanel(Client *c) {
+    return !strcmp(c->name, panel[0]);
+}
+
 void
 incnmaster(const Arg *arg)
 {
@@ -1049,7 +1061,8 @@ manage(Window w, XWindowAttributes *wa)
	c->y = MAX(c->y, ((c->mon->by == c->mon->my) && (c->x + (c->w / 2) >= c->mon->wx)
		&& (c->x + (c->w / 2) < c->mon->wx + c->mon->ww)) ? bh : c->mon->my);
	c->bw = borderpx;
-
+    // no border - even when active
+    if (ispanel(c)) c->bw = c->oldbw = 0;
	wc.border_width = c->bw;
	XConfigureWindow(dpy, w, CWBorderWidth, &wc);
	XSetWindowBorder(dpy, w, scheme[SchemeNorm][ColBorder].pixel);
@@ -1283,6 +1296,7 @@ resizeclient(Client *c, int x, int y, int w, int h)
	c->oldw = c->w; c->w = wc.width = w;
	c->oldh = c->h; c->h = wc.height = h;
	wc.border_width = c->bw;
+    if (ispanel(c)) c->y = c->oldy = c->bw = wc.y = wc.border_width = 0;
	XConfigureWindow(dpy, c->win, CWX|CWY|CWWidth|CWHeight|CWBorderWidth, &wc);
	configure(c);
	XSync(dpy, False);
@@ -1991,7 +2005,7 @@ void
 updatestatus(void)
 {
	if (!gettextprop(root, XA_WM_NAME, stext, sizeof(stext)))
-		strcpy(stext, "dwm-"VERSION);
+		strcpy(stext, " "); // no shining of dwm version thru panel, when transparent
	drawbar(selmon);
 }

--
2.31.1