Add centeredmaster and centeredfloatingmaster layouts

config.def.h

@@ -53,6 +53,8 @@ static const Layout layouts[] = {
 	{ "[]=",      tile },    /* first entry is default */
 	{ "><>",      NULL },    /* no layout function means floating behavior */
 	{ "[M]",      monocle },
+	{ "|M|",      centeredmaster },
+	{ ">M>",      centeredfloatingmaster },
 };
 
 /* key definitions */
@@ -104,6 +106,8 @@ static Key keys[] = {
 	{ MODKEY,                       XK_t,      setlayout,      {.v = &layouts[0]} },
 	{ MODKEY,                       XK_f,      setlayout,      {.v = &layouts[1]} },
 	{ MODKEY,                       XK_m,      setlayout,      {.v = &layouts[2]} },
+	{ MODKEY,                       XK_u,      setlayout,      {.v = &layouts[3]} },
+	{ MODKEY,                       XK_o,      setlayout,      {.v = &layouts[4]} },
 	{ MODKEY,                       XK_space,  setlayout,      {0} },
 	{ MODKEY|ShiftMask,             XK_space,  togglefloating, {0} },
 	{ MODKEY,                       XK_0,      view,           {.ui = ~0 } },

config.h

@@ -53,6 +53,8 @@ static const Layout layouts[] = {
 	{ "[]=",      tile },    /* first entry is default */
 	{ "><>",      NULL },    /* no layout function means floating behavior */
 	{ "[M]",      monocle },
+	{ "|M|",      centeredmaster },
+	{ ">M>",      centeredfloatingmaster },
 };
 
 /* key definitions */
@@ -90,6 +92,8 @@ static Key keys[] = {
 	{ MODKEY,                       XK_t,      setlayout,      {.v = &layouts[0]} },
 	{ MODKEY,                       XK_f,      setlayout,      {.v = &layouts[1]} },
 	{ MODKEY,                       XK_m,      setlayout,      {.v = &layouts[2]} },
+	{ MODKEY,                       XK_u,      setlayout,      {.v = &layouts[3]} },
+	{ MODKEY,                       XK_o,      setlayout,      {.v = &layouts[4]} },
 	{ MODKEY,                       XK_space,  setlayout,      {0} },
 	{ MODKEY|ShiftMask,             XK_space,  togglefloating, {0} },
 	{ MODKEY,                       XK_0,      view,           {.ui = ~0 } },

dwm.c

@@ -254,6 +254,9 @@ static int xerrorstart(Display *dpy, XErrorEvent *ee);
 static void xinitvisual();
 static void zoom(const Arg *arg);
 
+static void centeredmaster(Monitor *m);
+static void centeredfloatingmaster(Monitor *m);
+
 static void keyrelease(XEvent *e);
 static void combotag(const Arg *arg);
 static void comboview(const Arg *arg);
@@ -2399,3 +2402,106 @@ main(int argc, char *argv[])
 	XCloseDisplay(dpy);
 	return EXIT_SUCCESS;
 }
+
+void
+centeredmaster(Monitor *m)
+{
+	unsigned int i, n, h, mw, mx, my, oty, ety, tw;
+	Client *c;
+
+	/* count number of clients in the selected monitor */
+	for (n = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), n++);
+	if (n == 0)
+		return;
+
+	/* initialize areas */
+	mw = m->ww;
+	mx = 0;
+	my = 0;
+	tw = mw;
+
+	if (n > m->nmaster) {
+		/* go mfact box in the center if more than nmaster clients */
+		mw = m->nmaster ? m->ww * m->mfact : 0;
+		tw = m->ww - mw;
+
+		if (n - m->nmaster > 1) {
+			/* only one client */
+			mx = (m->ww - mw) / 2;
+			tw = (m->ww - mw) / 2;
+		}
+	}
+
+	oty = 0;
+	ety = 0;
+	for (i = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), i++)
+	if (i < m->nmaster) {
+		/* nmaster clients are stacked vertically, in the center
+		 * of the screen */
+		h = (m->wh - my) / (MIN(n, m->nmaster) - i);
+		resize(c, m->wx + mx, m->wy + my, mw - (2*c->bw),
+		       h - (2*c->bw), 0);
+		my += HEIGHT(c);
+	} else {
+		/* stack clients are stacked vertically */
+		if ((i - m->nmaster) % 2 ) {
+			h = (m->wh - ety) / ( (1 + n - i) / 2);
+			resize(c, m->wx, m->wy + ety, tw - (2*c->bw),
+			       h - (2*c->bw), 0);
+			ety += HEIGHT(c);
+		} else {
+			h = (m->wh - oty) / ((1 + n - i) / 2);
+			resize(c, m->wx + mx + mw, m->wy + oty,
+			       tw - (2*c->bw), h - (2*c->bw), 0);
+			oty += HEIGHT(c);
+		}
+	}
+}
+
+void
+centeredfloatingmaster(Monitor *m)
+{
+	unsigned int i, n, w, mh, mw, mx, mxo, my, myo, tx;
+	Client *c;
+
+	/* count number of clients in the selected monitor */
+	for (n = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), n++);
+	if (n == 0)
+		return;
+
+	/* initialize nmaster area */
+	if (n > m->nmaster) {
+		/* go mfact box in the center if more than nmaster clients */
+		if (m->ww > m->wh) {
+			mw = m->nmaster ? m->ww * m->mfact : 0;
+			mh = m->nmaster ? m->wh * 0.9 : 0;
+		} else {
+			mh = m->nmaster ? m->wh * m->mfact : 0;
+			mw = m->nmaster ? m->ww * 0.9 : 0;
+		}
+		mx = mxo = (m->ww - mw) / 2;
+		my = myo = (m->wh - mh) / 2;
+	} else {
+		/* go fullscreen if all clients are in the master area */
+		mh = m->wh;
+		mw = m->ww;
+		mx = mxo = 0;
+		my = myo = 0;
+	}
+
+	for(i = tx = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), i++)
+	if (i < m->nmaster) {
+		/* nmaster clients are stacked horizontally, in the center
+		 * of the screen */
+		w = (mw + mxo - mx) / (MIN(n, m->nmaster) - i);
+		resize(c, m->wx + mx, m->wy + my, w - (2*c->bw),
+		       mh - (2*c->bw), 0);
+		mx += WIDTH(c);
+	} else {
+		/* stack clients are stacked horizontally */
+		w = (m->ww - tx) / (n - i);
+		resize(c, m->wx + tx, m->wy, w - (2*c->bw),
+		       m->wh - (2*c->bw), 0);
+		tx += WIDTH(c);
+	}
+}