From e5d1064c01081044c63325f4c195fcec58442654 Mon Sep 17 00:00:00 2001
From: Jason Woofenden <jason@jasonwoof.com>
Date: Tue, 2 Dec 2014 13:12:02 -0500
Subject: [PATCH] fix deck layout

---
 dwm.c |   74 +++++++++++++++++++++++++++++++++++++++--------------------------
 1 file changed, 45 insertions(+), 29 deletions(-)

diff --git a/dwm.c b/dwm.c
index d5eec04..71ab0f2 100644
--- a/dwm.c
+++ b/dwm.c
@@ -90,6 +90,7 @@ struct Client {
 	int oldx, oldy, oldw, oldh;
 	int basew, baseh, incw, inch, maxw, maxh, minw, minh;
 	int bw, oldbw;
+	int opacity;
 	unsigned int tags;
 	Bool isfixed, isfloating, isurgent, neverfocus, oldstate, isfullscreen, screen_hog;
 	Client *next;
@@ -272,22 +273,59 @@ static Monitor *mons, *selmon;
 static Window root;
 
 // unfocused windows get transparent (feature)
-static const unsigned long unfocused_opacity[] = { 0xbfffffff };
-static const unsigned long invisible_opacity[] = { 0x00000000 };
+static const unsigned long opacities[] = { 0, 0xbfffffff, 0x00000000 }; // first unused
 static void window_set_opaque(Client *c);
 static void window_set_translucent(Client *c);
 static void window_set_invisible(Client *c);
+static void window_set_opacity(Client *c, int opacity_index);
+static void update_window_opacities(Monitor *m);
+void
+window_set_opacity(Client *c, int opacity_index) {
+	if (c->opacity == opacity_index) {
+		return;
+	}
+	c->opacity = opacity_index;
+	if (opacity_index == 0) {
+		XDeleteProperty(dpy, c->win, netatom[NetWMWindowOpacity]);
+	} else {
+		XChangeProperty(dpy, c->win, netatom[NetWMWindowOpacity], XA_CARDINAL, 32, PropModeReplace, (unsigned char *)(&opacities[opacity_index]), 1);
+	}
+}
 void
 window_set_opaque(Client *c) {
-	XDeleteProperty(dpy, c->win, netatom[NetWMWindowOpacity]);
+	window_set_opacity(c, 0);
 }
 void
 window_set_translucent(Client *c) {
-	XChangeProperty(dpy, c->win, netatom[NetWMWindowOpacity], XA_CARDINAL, 32, PropModeReplace, (unsigned char *)unfocused_opacity, 1);
+	window_set_opacity(c, 1);
 }
 void
 window_set_invisible(Client *c) {
-	XChangeProperty(dpy, c->win, netatom[NetWMWindowOpacity], XA_CARDINAL, 32, PropModeReplace, (unsigned char *)invisible_opacity, 1);
+	window_set_opacity(c, 2);
+}
+void
+update_window_opacities(Monitor *m) {
+	Client *master, *slave, *c;
+	Bool selection_floating = False;
+	slave = master = nexttiled(m->clients);
+	if (master) slave = nexttiled(master->next);
+	if (m->sel && m->sel != master) {
+		if (nexttiled(m->sel) == m->sel) // if selection is tiled
+			slave = m->sel;
+		else
+			selection_floating = True;
+	}
+	for (c = m->clients; c; c = c->next) {
+		if (ISVISIBLE(c)) {
+			if (c->isfloating || c == m->sel || (c == master && selection_floating)) {
+				window_set_opaque(c);
+			} else if (c == master || c == slave) {
+				window_set_translucent(c);
+			} else {
+				window_set_invisible(c);
+			}
+		}
+	}
 }
 
 
@@ -849,6 +887,7 @@ focus(Client *c) {
 		XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
 	}
 	selmon->sel = c;
+	update_window_opacities(selmon);
 	drawbars();
 	if(c && (!root || (c->win!=root)) )
 		window_set_opaque(c);
@@ -1069,6 +1108,7 @@ manage(Window w, XWindowAttributes *wa) {
 
 	if(!(c = calloc(1, sizeof(Client))))
 		die("fatal: could not malloc() %u bytes\n", sizeof(Client));
+	c->opacity = -1; // who knows
 	c->win = w;
 	updatetitle(c);
 	if(XGetTransientForHint(dpy, w, &trans) && (t = wintoclient(trans))) {
@@ -1804,32 +1844,8 @@ toggleview(const Arg *arg) {
 
 void
 unfocus(Client *c, Bool setfocus) {
-	Client *w;
 	if(!c)
 		return;
-	if(!root || c->win!=root) {
-		w = nexttiled(c->mon->clients);
-		if (!w) {
-			// no tiled windows
-			window_set_translucent(c);
-		} else if (w == c) {
-			// master
-			window_set_translucent(c);
-		} else {
-			w = nexttiled(w->next);
-			if (!w) {
-				// c must not be tiled
-				window_set_translucent(c);
-			} else {
-				if (w == c) { // first slave
-					window_set_translucent(c);
-				} else {
-					window_set_invisible(c);
-					window_set_translucent(w);
-				}
-			}
-		}
-	}
 	grabbuttons(c, False);
 	XSetWindowBorder(dpy, c->win, scheme[SchemeNorm].border->rgb);
 	if(setfocus) {
-- 
1.7.10.4