monocle tab switching

dwm/.dwm/dwm.c

@@ -82,7 +82,7 @@ enum { NetSupported, NetWMName, NetWMState, NetWMCheck,
        NetWMFullscreen, NetActiveWindow, NetWMWindowType,
        NetWMWindowTypeDialog, NetClientList, NetLast }; /* EWMH atoms */
 enum { WMProtocols, WMDelete, WMState, WMTakeFocus, WMLast }; /* default atoms */
-enum { ClkTagBar, ClkLtSymbol, ClkStatusText, ClkWinTitle,
+enum { ClkTagBar, ClkTabBar, ClkLtSymbol, ClkStatusText, ClkWinTitle,
        ClkClientWin, ClkRootWin, ClkLast }; /* clicks */
 
 typedef union {
@@ -130,24 +130,32 @@ typedef struct {
 	void (*arrange)(Monitor *);
 } Layout;
 
+#define MAXTABS 50
+
 struct Monitor {
 	char ltsymbol[16];
 	float mfact;
 	int nmaster;
 	int num;
 	int by;               /* bar geometry */
+	int ty;               /* tab bar geometry */
 	int mx, my, mw, mh;   /* screen size */
 	int wx, wy, ww, wh;   /* window area  */
 	unsigned int seltags;
 	unsigned int sellt;
 	unsigned int tagset[2];
 	int showbar;
+	int showtab;
 	int topbar;
+	int toptab;
 	Client *clients;
 	Client *sel;
 	Client *stack;
 	Monitor *next;
 	Window barwin;
+	Window tabwin;
+	int ntabs;
+	int tab_widths[MAXTABS];
 	const Layout *lt[2];
 };
 
@@ -183,12 +191,15 @@ static void detachstack(Client *c);
 static Monitor *dirtomon(int dir);
 static void drawbar(Monitor *m);
 static void drawbars(void);
+static void drawtab(Monitor *m);
+static void drawtabs(void);
 static void enternotify(XEvent *e);
 static void expose(XEvent *e);
 static void focus(Client *c);
 static void focusin(XEvent *e);
 static void focusmon(const Arg *arg);
 static void focusstack(const Arg *arg);
+static void focuswin(const Arg* arg);
 static Atom getatomprop(Client *c, Atom prop);
 static int getrootptr(int *x, int *y);
 static long getstate(Window w);
@@ -231,6 +242,7 @@ static void showhide(Client *c);
 static void sighup(int unused);
 static void sigterm(int unused);
 static void spawn(const Arg *arg);
+static void tabmode(const Arg *arg);
 static void tag(const Arg *arg);
 static void tagmon(const Arg *arg);
 static void tile(Monitor *m);
@@ -273,6 +285,7 @@ static char stext[256];
 static int screen;
 static int sw, sh;           /* X display screen geometry width, height */
 static int bh;               /* bar height */
+static int th = 0;           /* tab bar geometry */
 static int lrpad;            /* sum of left and right padding for text */
 static int (*xerrorxlib)(Display *, XErrorEvent *);
 static unsigned int numlockmask = 0;
@@ -435,8 +448,9 @@ arrange(Monitor *m)
 }
 
 void
-arrangemon(Monitor *m)
-{
+arrangemon(Monitor *m) {
+	updatebarpos(m);
+	XMoveResizeWindow(dpy, m->tabwin, m->wx, m->ty, m->ww, th);
 	strncpy(m->ltsymbol, m->lt[m->sellt]->symbol, sizeof m->ltsymbol);
 	if (m->lt[m->sellt]->arrange)
 		m->lt[m->sellt]->arrange(m);
@@ -486,7 +500,24 @@ buttonpress(XEvent *e)
 			click = ClkStatusText;
 		else
 			click = ClkWinTitle;
-	} else if ((c = wintoclient(ev->window))) {
+	}
+	if(ev->window == selmon->tabwin) {
+		i = 0; x = 0;
+		for(c = selmon->clients; c; c = c->next){
+			if(!ISVISIBLE(c)) continue;
+			x += selmon->tab_widths[i];
+			if (ev->x > x)
+				++i;
+			else
+				break;
+			if(i >= m->ntabs) break;
+		}
+		if(c) {
+			click = ClkTabBar;
+			arg.ui = i;
+		}
+	}
+	else if((c = wintoclient(ev->window))) {
 		focus(c);
 		restack(selmon);
 		XAllowEvents(dpy, ReplayPointer, CurrentTime);
@@ -494,8 +525,9 @@ buttonpress(XEvent *e)
 	}
 	for (i = 0; i < LENGTH(buttons); i++)
 		if (click == buttons[i].click && buttons[i].func && buttons[i].button == ev->button
-		&& CLEANMASK(buttons[i].mask) == CLEANMASK(ev->state))
-			buttons[i].func(click == ClkTagBar && buttons[i].arg.i == 0 ? &arg : &buttons[i].arg);
+		&& CLEANMASK(buttons[i].mask) == CLEANMASK(ev->state)){
+			buttons[i].func(((click == ClkTagBar || click == ClkTabBar) && buttons[i].arg.i == 0) ? &arg : &buttons[i].arg);
+		}
 }
 
 void
@@ -550,6 +582,8 @@ cleanupmon(Monitor *mon)
 	}
 	XUnmapWindow(dpy, mon->barwin);
 	XDestroyWindow(dpy, mon->barwin);
+	XUnmapWindow(dpy, mon->tabwin);
+	XDestroyWindow(dpy, mon->tabwin);
 	free(mon);
 }
 
@@ -713,7 +747,10 @@ createmon(void)
 	m->mfact = mfact;
 	m->nmaster = nmaster;
 	m->showbar = showbar;
+	m->showtab = showtab;
 	m->topbar = topbar;
+	m->toptab = toptab;
+	m->ntabs = 0;
 	m->lt[0] = &layouts[0];
 	m->lt[1] = &layouts[1 % LENGTH(layouts)];
 	strncpy(m->ltsymbol, layouts[0].symbol, sizeof m->ltsymbol);
@@ -830,6 +867,105 @@ drawbars(void)
 		drawbar(m);
 }
 
+void
+drawtabs(void) {
+	Monitor *m;
+
+	for(m = mons; m; m = m->next)
+		drawtab(m);
+}
+
+static int
+cmpint(const void *p1, const void *p2) {
+  /* The actual arguments to this function are "pointers to
+     pointers to char", but strcmp(3) arguments are "pointers
+     to char", hence the following cast plus dereference */
+  return *((int*) p1) > * (int*) p2;
+}
+
+
+void
+drawtab(Monitor *m) {
+	Client *c;
+	int i;
+	int itag = -1;
+	char view_info[50];
+	int view_info_w = 0;
+	int sorted_label_widths[MAXTABS];
+	int tot_width;
+	int maxsize = bh;
+	int x = 0;
+	int w = 0;
+
+	//view_info: indicate the tag which is displayed in the view
+	for(i = 0; i < LENGTH(tags); ++i){
+	  if((selmon->tagset[selmon->seltags] >> i) & 1) {
+	    if(itag >=0){ //more than one tag selected
+	      itag = -1;
+	      break;
+	    }
+	    itag = i;
+	  }
+	}
+
+	if(0 <= itag  && itag < LENGTH(tags)){
+	  snprintf(view_info, sizeof view_info, "[%s]", tags[itag]);
+	} else {
+	  strncpy(view_info, "[...]", sizeof view_info);
+	}
+	view_info[sizeof(view_info) - 1 ] = 0;
+	view_info_w = TEXTW(view_info);
+	tot_width = view_info_w;
+
+	/* Calculates number of labels and their width */
+	m->ntabs = 0;
+	for(c = m->clients; c; c = c->next){
+	  if(!ISVISIBLE(c)) continue;
+	  m->tab_widths[m->ntabs] = TEXTW(c->name);
+	  tot_width += m->tab_widths[m->ntabs];
+	  ++m->ntabs;
+	  if(m->ntabs >= MAXTABS) break;
+	}
+
+	if(tot_width > m->ww){ //not enough space to display the labels, they need to be truncated
+	  memcpy(sorted_label_widths, m->tab_widths, sizeof(int) * m->ntabs);
+	  qsort(sorted_label_widths, m->ntabs, sizeof(int), cmpint);
+	  tot_width = view_info_w;
+	  for(i = 0; i < m->ntabs; ++i){
+	    if(tot_width + (m->ntabs - i) * sorted_label_widths[i] > m->ww)
+	      break;
+	    tot_width += sorted_label_widths[i];
+	  }
+	  maxsize = (m->ww - tot_width) / (m->ntabs - i);
+	} else{
+	  maxsize = m->ww;
+	}
+	i = 0;
+	for(c = m->clients; c; c = c->next){
+	  if(!ISVISIBLE(c)) continue;
+	  if(i >= m->ntabs) break;
+	  if(m->tab_widths[i] >  maxsize) m->tab_widths[i] = maxsize;
+	  w = m->tab_widths[i];
+	  drw_setscheme(drw, scheme[(c == m->sel) ? SchemeSel : SchemeNorm]);
+	  drw_text(drw, x, 0, w, th, 0, c->name, 0);
+	  x += w;
+	  ++i;
+	}
+
+	drw_setscheme(drw, scheme[SchemeNorm]);
+
+	/* cleans interspace between window names and current viewed tag label */
+	w = m->ww - view_info_w - x;
+	drw_text(drw, x, 0, w, th, 0, "", 0);
+
+	/* view info */
+	x += w;
+	w = view_info_w;
+	drw_text(drw, x, 0, w, th, 0, view_info, 0);
+
+	drw_map(drw, m->tabwin, 0, 0, m->ww, th);
+}
+
 void
 enternotify(XEvent *e)
 {
@@ -855,8 +991,10 @@ expose(XEvent *e)
 	Monitor *m;
 	XExposeEvent *ev = &e->xexpose;
 
-	if (ev->count == 0 && (m = wintomon(ev->window)))
+	if(ev->count == 0 && (m = wintomon(ev->window))){
 		drawbar(m);
+		drawtab(m);
+	}
 }
 
 void
@@ -882,6 +1020,7 @@ focus(Client *c)
 	}
 	selmon->sel = c;
 	drawbars();
+	drawtabs();
 }
 
 /* there are some broken focus acquiring clients needing extra handling */
@@ -934,6 +1073,19 @@ focusstack(const Arg *arg)
 	}
 }
 
+void
+focuswin(const Arg* arg){
+  int iwin = arg->i;
+  Client* c = NULL;
+  for(c = selmon->clients; c && (iwin || !ISVISIBLE(c)) ; c = c->next){
+    if(ISVISIBLE(c)) --iwin;
+  };
+  if(c) {
+    focus(c);
+    restack(selmon);
+  }
+}
+
 Atom
 getatomprop(Client *c, Atom prop)
 {
@@ -1355,12 +1507,14 @@ propertynotify(XEvent *e)
 		case XA_WM_HINTS:
 			updatewmhints(c);
 			drawbars();
+			drawtabs();
 			break;
 		}
 		if (ev->atom == XA_WM_NAME || ev->atom == netatom[NetWMName]) {
 			updatetitle(c);
 			if (c == c->mon->sel)
 				drawbar(c->mon);
+			drawtab(c->mon);
 		}
 		if (ev->atom == netatom[NetWMWindowType])
 			updatewindowtype(c);
@@ -1499,6 +1653,7 @@ restack(Monitor *m)
 	XWindowChanges wc;
 
 	drawbar(m);
+	drawtab(m);
 	if (!m->sel)
 		return;
 	if (m->sel->isfloating || !m->lt[m->sellt]->arrange)
@@ -1793,6 +1948,7 @@ setup(void)
 		die("no fonts could be loaded.");
 	lrpad = drw->fonts->h;
 	bh = user_bh ? user_bh : drw->fonts->h + 2;
+	th = bh;
 	updategeom();
 	/* init atoms */
 	utf8string = XInternAtom(dpy, "UTF8_STRING", False);
@@ -1958,6 +2114,17 @@ togglebar(const Arg *arg)
 	arrange(selmon);
 }
 
+void
+tabmode(const Arg *arg)
+{
+	if(arg && arg->i >= 0)
+		selmon->showtab = arg->ui % showtab_nmodes;
+	else
+		selmon->showtab = (selmon->showtab + 1 ) % showtab_nmodes;
+	arrange(selmon);
+}
+
+
 void
 togglefloating(const Arg *arg)
 {
@@ -2092,6 +2259,11 @@ updatebars(void)
 				CWOverrideRedirect|CWBackPixmap|CWEventMask, &wa);
 		XDefineCursor(dpy, m->barwin, cursor[CurNormal]->cursor);
 		XMapRaised(dpy, m->barwin);
+		m->tabwin = XCreateWindow(dpy, root, m->wx, m->ty, m->ww, th, 0, DefaultDepth(dpy, screen),
+						CopyFromParent, DefaultVisual(dpy, screen),
+						CWOverrideRedirect|CWBackPixmap|CWEventMask, &wa);
+		XDefineCursor(dpy, m->tabwin, cursor[CurNormal]->cursor);
+		XMapRaised(dpy, m->tabwin);
 		XSetClassHint(dpy, m->barwin, &ch);
 	}
 }
@@ -2099,14 +2271,33 @@ updatebars(void)
 void
 updatebarpos(Monitor *m)
 {
+	Client *c;
+	int nvis = 0;
+
 	m->wy = m->my;
 	m->wh = m->mh;
 	if (m->showbar) {
 		m->wh -= bh;
 		m->by = m->topbar ? m->wy : m->wy + m->wh;
-		m->wy = m->topbar ? m->wy + bh : m->wy;
-	} else
+		if ( m->topbar )
+			m->wy += bh;
+	} else {
 		m->by = -bh;
+	}
+
+	for(c = m->clients; c; c = c->next) {
+		if(ISVISIBLE(c)) ++nvis;
+	}
+
+	if(m->showtab == showtab_always
+	   || ((m->showtab == showtab_auto) && (nvis > 1) && (m->lt[m->sellt]->arrange == monocle))) {
+		m->wh -= th;
+		m->ty = m->toptab ? m->wy : m->wy + m->wh;
+		if ( m->toptab )
+			m->wy += th;
+	} else {
+		m->ty = -th;
+	}
 }
 
 void
@@ -2344,7 +2535,7 @@ wintomon(Window w)
 	if (w == root && getrootptr(&x, &y))
 		return recttomon(x, y, 1, 1);
 	for (m = mons; m; m = m->next)
-		if (w == m->barwin)
+		if (w == m->barwin || w == m->tabwin)
 			return m;
 	if ((c = wintoclient(w)))
 		return c->mon;