From 095439425e64f2567f141d5d941178b148ef0d3a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Andr=C3=A9=20Desgualdo=20Pereira?= <desgua@gmail.com>
Date: Sun, 12 Oct 2025 11:44:26 -0300
Subject: [PATCH] decklayout

---
 config.def.h |  2 ++
 dwl.c        | 61 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 63 insertions(+)

diff --git a/config.def.h b/config.def.h
index 95c2afa..cc846eb 100644
--- a/config.def.h
+++ b/config.def.h
@@ -34,6 +34,7 @@ static const Layout layouts[] = {
 	{ "[]=",      tile },
 	{ "><>",      NULL },    /* no layout function means floating behavior */
 	{ "[M]",      monocle },
+	{ "[E]",      deck },
 };
 
 /* monitors */
@@ -139,6 +140,7 @@ static const Key keys[] = {
 	{ MODKEY,                    XKB_KEY_t,          setlayout,      {.v = &layouts[0]} },
 	{ MODKEY,                    XKB_KEY_f,          setlayout,      {.v = &layouts[1]} },
 	{ MODKEY,                    XKB_KEY_m,          setlayout,      {.v = &layouts[2]} },
+	{ MODKEY,                    XKB_KEY_a,          setlayout,      {.v = &layouts[3]} },
 	{ MODKEY,                    XKB_KEY_space,      setlayout,      {0} },
 	{ MODKEY|WLR_MODIFIER_SHIFT, XKB_KEY_space,      togglefloating, {0} },
 	{ MODKEY,                    XKB_KEY_e,         togglefullscreen, {0} },
diff --git a/dwl.c b/dwl.c
index 12f441e..227004f 100644
--- a/dwl.c
+++ b/dwl.c
@@ -278,6 +278,7 @@ static void destroylayersurfacenotify(struct wl_listener *listener, void *data);
 static void destroylock(SessionLock *lock, int unlocked);
 static void destroylocksurface(struct wl_listener *listener, void *data);
 static void destroynotify(struct wl_listener *listener, void *data);
+static void deck(Monitor *m);
 static void destroypointerconstraint(struct wl_listener *listener, void *data);
 static void destroysessionlock(struct wl_listener *listener, void *data);
 static void destroykeyboardgroup(struct wl_listener *listener, void *data);
@@ -1837,6 +1838,66 @@ monocle(Monitor *m)
 		wlr_scene_node_raise_to_top(&c->scene->node);
 }
 
+void
+deck(Monitor *m)
+{
+	unsigned int mw, my;
+	int i, n = 0;
+	Client *c;
+
+	/* count tiled clients */
+	wl_list_for_each(c, &clients, link)
+
+		/* if (VISIBLEON(c, m) && !c->isfloating && !c->isfullscreen) */
+		if (VISIBLEON(c, m) && !c->isfloating)
+			n++;
+	if (n == 0)
+		return;
+
+	/* set master width */
+	if (n > m->nmaster)
+		mw = m->nmaster ? (int)roundf(m->w.width * m->mfact) : 0;
+	else
+		mw = m->w.width;
+
+	/* update layout symbol with number of stack windows */
+	/* use the following rules to count only the windows on the deck
+	if (n > m->nmaster)
+		snprintf(m->ltsymbol, sizeof m->ltsymbol, "[%d]", n - m->nmaster);
+	else
+		snprintf(m->ltsymbol, sizeof m->ltsymbol, "[%d]", n);  */
+
+	/* or this one to count all windows on the tag */
+	snprintf(m->ltsymbol, sizeof m->ltsymbol, "[%d]", n);
+
+	i = my = 0;
+	wl_list_for_each(c, &clients, link) {
+		/* if (!VISIBLEON(c, m) || c->isfloating || c->isfullscreen) */
+		if (!VISIBLEON(c, m) || c->isfloating)
+			continue;
+
+		if (i < m->nmaster) {
+			/* master clients */
+			resize(c, (struct wlr_box){
+				.x = m->w.x,
+				.y = m->w.y + my,
+				.width = mw,
+				.height = (m->w.height - my) / (MIN(n, m->nmaster) - i)
+			}, 0);
+			my += c->geom.height;
+		} else {
+			/* deck clients: overlap in stack area */
+			resize(c, (struct wlr_box){
+				.x = m->w.x + mw,
+				.y = m->w.y,
+				.width = m->w.width - mw,
+				.height = m->w.height
+			}, 0);
+		}
+		i++;
+	}
+}
+
 void
 motionabsolute(struct wl_listener *listener, void *data)
 {
-- 
2.51.0