path: root/desktop/dwm/patches/dwm-6.1-systray.diff

diff --git a/config.def.h b/config.def.h
index 7054c06..8393a58 100644
--- a/config.def.h
+++ b/config.def.h
@@ -13,6 +13,10 @@ static const char selbgcolor[]      = "#005577";
 static const char selfgcolor[]      = "#eeeeee";
 static const unsigned int borderpx  = 1;        /* border pixel of windows */
 static const unsigned int snap      = 32;       /* snap pixel */
+static const unsigned int systraypinning = 0;   /* 0: sloppy systray follows selected monitor, >0: pin systray to monitor X */
+static const unsigned int systrayspacing = 2;   /* systray spacing */
+static const int systraypinningfailfirst = 1;   /* 1: if pinning fails, display systray on the first monitor, 0: display systray on the last monitor*/
+static const int showsystray        = 1;        /* 0 means no systray */
 static const int showbar            = 1;        /* 0 means no bar */
 static const int topbar             = 1;        /* 0 means bottom bar */
 
diff --git a/dwm.c b/dwm.c
index 0362114..1bbce1d 100644
--- a/dwm.c
+++ b/dwm.c
@@ -57,12 +57,30 @@
 #define TAGMASK                 ((1 << LENGTH(tags)) - 1)
 #define TEXTW(X)                (drw_text(drw, 0, 0, 0, 0, (X), 0) + drw->fonts[0]->h)
 
+#define SYSTEM_TRAY_REQUEST_DOCK    0
+#define _NET_SYSTEM_TRAY_ORIENTATION_HORZ 0
+
+/* XEMBED messages */
+#define XEMBED_EMBEDDED_NOTIFY      0
+#define XEMBED_WINDOW_ACTIVATE      1
+#define XEMBED_FOCUS_IN             4
+#define XEMBED_MODALITY_ON         10
+
+#define XEMBED_MAPPED              (1 << 0)
+#define XEMBED_WINDOW_ACTIVATE      1
+#define XEMBED_WINDOW_DEACTIVATE    2
+
+#define VERSION_MAJOR               0
+#define VERSION_MINOR               0
+#define XEMBED_EMBEDDED_VERSION (VERSION_MAJOR << 16) | VERSION_MINOR
+
 /* enums */
 enum { CurNormal, CurResize, CurMove, CurLast }; /* cursor */
 enum { SchemeNorm, SchemeSel, SchemeLast }; /* color schemes */
-enum { NetSupported, NetWMName, NetWMState,
-       NetWMFullscreen, NetActiveWindow, NetWMWindowType,
-       NetWMWindowTypeDialog, NetClientList, NetLast }; /* EWMH atoms */
+enum { NetSupported, NetSystemTray, NetSystemTrayOP, NetSystemTrayOrientation,
+	   NetWMName, NetWMState, NetWMFullscreen, NetActiveWindow, NetWMWindowType,
+	   NetWMWindowTypeDialog, NetClientList, NetLast }; /* EWMH atoms */
+enum { Manager, Xembed, XembedInfo, XLast }; /* Xembed atoms */
 enum { WMProtocols, WMDelete, WMState, WMTakeFocus, WMLast }; /* default atoms */
 enum { ClkTagBar, ClkLtSymbol, ClkStatusText, ClkWinTitle,
        ClkClientWin, ClkRootWin, ClkLast }; /* clicks */
@@ -141,6 +159,12 @@ typedef struct {
 	int monitor;
 } Rule;
 
+typedef struct Systray   Systray;
+struct Systray {
+	Window win;
+	Client *icons;
+};
+
 /* function declarations */
 static void applyrules(Client *c);
 static int applysizehints(Client *c, int *x, int *y, int *w, int *h, int interact);
@@ -170,8 +194,10 @@ static void focus(Client *c);
 static void focusin(XEvent *e);
 static void focusmon(const Arg *arg);
 static void focusstack(const Arg *arg);
+static Atom getatomprop(Client *c, Atom prop);
 static int getrootptr(int *x, int *y);
 static long getstate(Window w);
+static unsigned int getsystraywidth();
 static int gettextprop(Window w, Atom atom, char *text, unsigned int size);
 static void grabbuttons(Client *c, int focused);
 static void grabkeys(void);
@@ -189,13 +215,16 @@ static void pop(Client *);
 static void propertynotify(XEvent *e);
 static void quit(const Arg *arg);
 static Monitor *recttomon(int x, int y, int w, int h);
+static void removesystrayicon(Client *i);
 static void resize(Client *c, int x, int y, int w, int h, int interact);
+static void resizebarwin(Monitor *m);
 static void resizeclient(Client *c, int x, int y, int w, int h);
 static void resizemouse(const Arg *arg);
+static void resizerequest(XEvent *e);
 static void restack(Monitor *m);
 static void run(void);
 static void scan(void);
-static int sendevent(Client *c, Atom proto);
+static int sendevent(Window w, Atom proto, int m, long d0, long d1, long d2, long d3, long d4);
 static void sendmon(Client *c, Monitor *m);
 static void setclientstate(Client *c, long state);
 static void setfocus(Client *c);
@@ -206,6 +235,7 @@ static void setup(void);
 static void showhide(Client *c);
 static void sigchld(int unused);
 static void spawn(const Arg *arg);
+static Monitor *systraytomon(Monitor *m);
 static void tag(const Arg *arg);
 static void tagmon(const Arg *arg);
 static void tile(Monitor *);
@@ -223,18 +253,24 @@ static void updateclientlist(void);
 static void updatenumlockmask(void);
 static void updatesizehints(Client *c);
 static void updatestatus(void);
+static void updatesystray(void);
+static void updatesystrayicongeom(Client *i, int w, int h);
+static void updatesystrayiconstate(Client *i, XPropertyEvent *ev);
 static void updatewindowtype(Client *c);
 static void updatetitle(Client *c);
 static void updatewmhints(Client *c);
 static void view(const Arg *arg);
 static Client *wintoclient(Window w);
 static Monitor *wintomon(Window w);
+static Client *wintosystrayicon(Window w);
 static int xerror(Display *dpy, XErrorEvent *ee);
 static int xerrordummy(Display *dpy, XErrorEvent *ee);
 static int xerrorstart(Display *dpy, XErrorEvent *ee);
 static void zoom(const Arg *arg);
 
 /* variables */
+static Systray *systray = NULL;
+static unsigned long systrayorientation = _NET_SYSTEM_TRAY_ORIENTATION_HORZ;
 static const char broken[] = "broken";
 static char stext[256];
 static int screen;
@@ -256,9 +292,10 @@ static void (*handler[LASTEvent]) (XEvent *) = {
 	[MapRequest] = maprequest,
 	[MotionNotify] = motionnotify,
 	[PropertyNotify] = propertynotify,
+	[ResizeRequest] = resizerequest,
 	[UnmapNotify] = unmapnotify
 };
-static Atom wmatom[WMLast], netatom[NetLast];
+static Atom wmatom[WMLast], netatom[NetLast], xatom[XLast];
 static int running = 1;
 static Cur *cursor[CurLast];
 static ClrScheme scheme[SchemeLast];
@@ -479,6 +516,11 @@ cleanup(void)
 	XUngrabKey(dpy, AnyKey, AnyModifier, root);
 	while (mons)
 		cleanupmon(mons);
+	if (showsystray) {
+		XUnmapWindow(dpy, systray->win);
+		XDestroyWindow(dpy, systray->win);
+		free(systray);
+	}
 	for (i = 0; i < CurLast; i++)
 		drw_cur_free(drw, cursor[i]);
 	for (i = 0; i < SchemeLast; i++) {
@@ -524,9 +566,50 @@ clearurgent(Client *c)
 void
 clientmessage(XEvent *e)
 {
+	XWindowAttributes wa;
+	XSetWindowAttributes swa;
 	XClientMessageEvent *cme = &e->xclient;
 	Client *c = wintoclient(cme->window);
 
+	if (showsystray && cme->window == systray->win && cme->message_type == netatom[NetSystemTrayOP]) {
+		/* add systray icons */
+		if (cme->data.l[1] == SYSTEM_TRAY_REQUEST_DOCK) {
+			if (!(c = (Client *)calloc(1, sizeof(Client))))
+				die("fatal: could not malloc() %u bytes\n", sizeof(Client));
+			c->win = cme->data.l[2];
+			c->mon = selmon;
+			c->next = systray->icons;
+			systray->icons = c;
+			XGetWindowAttributes(dpy, c->win, &wa);
+			c->x = c->oldx = c->y = c->oldy = 0;
+			c->w = c->oldw = wa.width;
+			c->h = c->oldh = wa.height;
+			c->oldbw = wa.border_width;
+			c->bw = 0;
+			c->isfloating = True;
+			/* reuse tags field as mapped status */
+			c->tags = 1;
+			updatesizehints(c);
+			updatesystrayicongeom(c, wa.width, wa.height);
+			XAddToSaveSet(dpy, c->win);
+			XSelectInput(dpy, c->win, StructureNotifyMask | PropertyChangeMask | ResizeRedirectMask);
+			XReparentWindow(dpy, c->win, systray->win, 0, 0);
+			/* use parents background color */
+			swa.background_pixel  = scheme[SchemeNorm].bg->pix;
+			XChangeWindowAttributes(dpy, c->win, CWBackPixel, &swa);
+			sendevent(c->win, netatom[Xembed], StructureNotifyMask, CurrentTime, XEMBED_EMBEDDED_NOTIFY, 0 , systray->win, XEMBED_EMBEDDED_VERSION);
+			/* FIXME not sure if I have to send these events, too */
+			sendevent(c->win, netatom[Xembed], StructureNotifyMask, CurrentTime, XEMBED_FOCUS_IN, 0 , systray->win, XEMBED_EMBEDDED_VERSION);
+			sendevent(c->win, netatom[Xembed], StructureNotifyMask, CurrentTime, XEMBED_WINDOW_ACTIVATE, 0 , systray->win, XEMBED_EMBEDDED_VERSION);
+			sendevent(c->win, netatom[Xembed], StructureNotifyMask, CurrentTime, XEMBED_MODALITY_ON, 0 , systray->win, XEMBED_EMBEDDED_VERSION);
+			XSync(dpy, False);
+			resizebarwin(selmon);
+			updatesystray();
+			setclientstate(c, NormalState);
+		}
+		return;
+	}
+
 	if (!c)
 		return;
 	if (cme->message_type == netatom[NetWMState]) {
@@ -576,8 +659,7 @@ configurenotify(XEvent *e)
 		if (updategeom() || dirty) {
 			drw_resize(drw, sw, bh);
 			updatebars();
-			for (m = mons; m; m = m->next)
-				XMoveResizeWindow(dpy, m->barwin, m->wx, m->by, m->ww, bh);
+			resizebarwin(m);
 			focus(NULL);
 			arrange(NULL);
 		}
@@ -661,6 +743,11 @@ destroynotify(XEvent *e)
 
 	if ((c = wintoclient(ev->window)))
 		unmanage(c, 1);
+	else if ((c = wintosystrayicon(ev->window))) {
+		removesystrayicon(c);
+		resizebarwin(selmon);
+		updatesystray();
+	}
 }
 
 void
@@ -710,6 +797,7 @@ drawbar(Monitor *m)
 
 	dx = (drw->fonts[0]->ascent + drw->fonts[0]->descent + 2) / 4;
 
+	resizebarwin(m);
 	for (c = m->clients; c; c = c->next) {
 		occ |= c->tags;
 		if (c->isurgent)
@@ -732,6 +820,9 @@ drawbar(Monitor *m)
 	if (m == selmon) { /* status is only drawn on selected monitor */
 		w = TEXTW(stext);
 		x = m->ww - w;
+		if (showsystray && m == systraytomon(m)) {
+			x -= getsystraywidth();
+		}
 		if (x < xx) {
 			x = xx;
 			w = m->ww - xx;
@@ -760,6 +851,7 @@ drawbars(void)
 
 	for (m = mons; m; m = m->next)
 		drawbar(m);
+	updatesystray();
 }
 
 void
@@ -787,8 +879,11 @@ 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);
+		if (m == selmon)
+			updatesystray();
+	}
 }
 
 void
@@ -875,10 +970,17 @@ getatomprop(Client *c, Atom prop)
 	unsigned long dl;
 	unsigned char *p = NULL;
 	Atom da, atom = None;
+	/* FIXME getatomprop should return the number of items and a pointer to
+	 * the stored data instead of this workaround */
+	Atom req = XA_ATOM;
+	if (prop == xatom[XembedInfo])
+		req = xatom[XembedInfo];
 
-	if (XGetWindowProperty(dpy, c->win, prop, 0L, sizeof atom, False, XA_ATOM,
+	if (XGetWindowProperty(dpy, c->win, prop, 0L, sizeof atom, False, req,
 	                      &da, &di, &dl, &dl, &p) == Success && p) {
 		atom = *(Atom *)p;
+		if (da == xatom[XembedInfo] && dl == 2)
+			atom = ((Atom *)p)[1];
 		XFree(p);
 	}
 	return atom;
@@ -912,6 +1014,15 @@ getstate(Window w)
 	return result;
 }
 
+unsigned int
+getsystraywidth() {
+	unsigned int w = 0;
+	Client *i;
+	if (showsystray)
+		for (i = systray->icons; i; w += i->w + systrayspacing, i = i->next);
+	return w ? w + systrayspacing : 1;
+}
+
 int
 gettextprop(Window w, Atom atom, char *text, unsigned int size)
 {
@@ -1018,7 +1129,7 @@ killclient(const Arg *arg)
 {
 	if (!selmon->sel)
 		return;
-	if (!sendevent(selmon->sel, wmatom[WMDelete])) {
+	if (!sendevent(selmon->sel->win, wmatom[WMDelete], NoEventMask, wmatom[WMDelete], CurrentTime, 0 , 0, 0)) {
 		XGrabServer(dpy);
 		XSetErrorHandler(xerrordummy);
 		XSetCloseDownMode(dpy, DestroyAll);
@@ -1105,6 +1216,12 @@ maprequest(XEvent *e)
 {
 	static XWindowAttributes wa;
 	XMapRequestEvent *ev = &e->xmaprequest;
+	Client *i;
+	if ((i = wintosystrayicon(ev->window))) {
+		sendevent(i->win, netatom[Xembed], StructureNotifyMask, CurrentTime, XEMBED_WINDOW_ACTIVATE, 0, systray->win, XEMBED_EMBEDDED_VERSION);
+		resizebarwin(selmon);
+		updatesystray();
+	}
 
 	if (!XGetWindowAttributes(dpy, ev->window, &wa))
 		return;
@@ -1232,6 +1349,16 @@ propertynotify(XEvent *e)
 	Window trans;
 	XPropertyEvent *ev = &e->xproperty;
 
+	if ((c = wintosystrayicon(ev->window))) {
+		if (ev->atom == XA_WM_NORMAL_HINTS) {
+			updatesizehints(c);
+			updatesystrayicongeom(c, c->w, c->h);
+		}
+		else
+			updatesystrayiconstate(c, ev);
+		resizebarwin(selmon);
+		updatesystray();
+	}
 	if ((ev->window == root) && (ev->atom == XA_WM_NAME))
 		updatestatus();
 	else if (ev->state == PropertyDelete)
@@ -1283,6 +1410,19 @@ recttomon(int x, int y, int w, int h)
 }
 
 void
+removesystrayicon(Client *i) {
+	Client **ii;
+
+	if (!showsystray || !i)
+		return;
+	for (ii = &systray->icons; *ii && *ii != i; ii = &(*ii)->next);
+	if (ii)
+		*ii = i->next;
+	free(i);
+}
+
+
+void
 resize(Client *c, int x, int y, int w, int h, int interact)
 {
 	if (applysizehints(c, &x, &y, &w, &h, interact))
@@ -1290,6 +1430,14 @@ resize(Client *c, int x, int y, int w, int h, int interact)
 }
 
 void
+resizebarwin(Monitor *m) {
+	unsigned int w = m->ww;
+	if (showsystray && m == systraytomon(m))
+		w -= getsystraywidth();
+	XMoveResizeWindow(dpy, m->barwin, m->wx, m->by, w, bh);
+}
+
+void
 resizeclient(Client *c, int x, int y, int w, int h)
 {
 	XWindowChanges wc;
@@ -1362,6 +1510,18 @@ resizemouse(const Arg *arg)
 }
 
 void
+resizerequest(XEvent *e) {
+	XResizeRequestEvent *ev = &e->xresizerequest;
+	Client *i;
+
+	if ((i = wintosystrayicon(ev->window))) {
+		updatesystrayicongeom(i, ev->width, ev->height);
+		resizebarwin(selmon);
+		updatesystray();
+	}
+}
+
+void
 restack(Monitor *m)
 {
 	Client *c;
@@ -1450,26 +1610,36 @@ setclientstate(Client *c, long state)
 }
 
 int
-sendevent(Client *c, Atom proto)
+sendevent(Window w, Atom proto, int mask, long d0, long d1, long d2, long d3, long d4)
 {
 	int n;
-	Atom *protocols;
+	Atom *protocols, mt;
 	int exists = 0;
 	XEvent ev;
 
-	if (XGetWMProtocols(dpy, c->win, &protocols, &n)) {
-		while (!exists && n--)
-			exists = protocols[n] == proto;
-		XFree(protocols);
+	if (proto == wmatom[WMTakeFocus] || proto == wmatom[WMDelete]) {
+		mt = wmatom[WMProtocols];
+		if (XGetWMProtocols(dpy, w, &protocols, &n)) {
+			while(!exists && n--)
+				exists = protocols[n] == proto;
+			XFree(protocols);
+		}
+	}
+	else {
+		exists = True;
+		mt = proto;
 	}
 	if (exists) {
 		ev.type = ClientMessage;
-		ev.xclient.window = c->win;
-		ev.xclient.message_type = wmatom[WMProtocols];
+		ev.xclient.window = w;
+		ev.xclient.message_type = mt;
 		ev.xclient.format = 32;
-		ev.xclient.data.l[0] = proto;
-		ev.xclient.data.l[1] = CurrentTime;
-		XSendEvent(dpy, c->win, False, NoEventMask, &ev);
+		ev.xclient.data.l[0] = d0;
+		ev.xclient.data.l[1] = d1;
+		ev.xclient.data.l[2] = d2;
+		ev.xclient.data.l[3] = d3;
+		ev.xclient.data.l[4] = d4;
+		XSendEvent(dpy, w, False, mask, &ev);
 	}
 	return exists;
 }
@@ -1483,7 +1653,7 @@ setfocus(Client *c)
 		                XA_WINDOW, 32, PropModeReplace,
 		                (unsigned char *) &(c->win), 1);
 	}
-	sendevent(c, wmatom[WMTakeFocus]);
+	sendevent(c->win, wmatom[WMTakeFocus], NoEventMask, wmatom[WMTakeFocus], CurrentTime, 0, 0, 0);
 }
 
 void
@@ -1569,12 +1739,18 @@ setup(void)
 	wmatom[WMTakeFocus] = XInternAtom(dpy, "WM_TAKE_FOCUS", False);
 	netatom[NetActiveWindow] = XInternAtom(dpy, "_NET_ACTIVE_WINDOW", False);
 	netatom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
+	netatom[NetSystemTray] = XInternAtom(dpy, "_NET_SYSTEM_TRAY_S0", False);
+	netatom[NetSystemTrayOP] = XInternAtom(dpy, "_NET_SYSTEM_TRAY_OPCODE", False);
+	netatom[NetSystemTrayOrientation] = XInternAtom(dpy, "_NET_SYSTEM_TRAY_ORIENTATION", False);
 	netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
 	netatom[NetWMState] = XInternAtom(dpy, "_NET_WM_STATE", False);
 	netatom[NetWMFullscreen] = XInternAtom(dpy, "_NET_WM_STATE_FULLSCREEN", False);
 	netatom[NetWMWindowType] = XInternAtom(dpy, "_NET_WM_WINDOW_TYPE", False);
 	netatom[NetWMWindowTypeDialog] = XInternAtom(dpy, "_NET_WM_WINDOW_TYPE_DIALOG", False);
 	netatom[NetClientList] = XInternAtom(dpy, "_NET_CLIENT_LIST", False);
+	xatom[Manager] = XInternAtom(dpy, "MANAGER", False);
+	xatom[Xembed] = XInternAtom(dpy, "_XEMBED", False);
+	xatom[XembedInfo] = XInternAtom(dpy, "_XEMBED_INFO", False);
 	/* init cursors */
 	cursor[CurNormal] = drw_cur_create(drw, XC_left_ptr);
 	cursor[CurResize] = drw_cur_create(drw, XC_sizing);
@@ -1586,6 +1762,8 @@ setup(void)
 	scheme[SchemeSel].border = drw_clr_create(drw, selbordercolor);
 	scheme[SchemeSel].bg = drw_clr_create(drw, selbgcolor);
 	scheme[SchemeSel].fg = drw_clr_create(drw, selfgcolor);
+	/* init system tray */
+	updatesystray();
 	/* init bars */
 	updatebars();
 	updatestatus();
@@ -1645,6 +1823,22 @@ spawn(const Arg *arg)
 	}
 }
 
+Monitor *
+systraytomon(Monitor *m) {
+	Monitor *t;
+	int i, n;
+	if (!systraypinning) {
+		if (!m)
+			return selmon;
+		return m == selmon ? m : NULL;
+	}
+	for (n = 1, t = mons; t && t->next; n++, t = t->next);
+	for (i = 1, t = mons; t && t->next && i < systraypinning; i++, t = t->next);
+	if (systraypinningfailfirst && n < systraypinning)
+		return mons;
+	return t;
+}
+
 void
 tag(const Arg *arg)
 {
@@ -1694,7 +1888,18 @@ togglebar(const Arg *arg)
 {
 	selmon->showbar = !selmon->showbar;
 	updatebarpos(selmon);
-	XMoveResizeWindow(dpy, selmon->barwin, selmon->wx, selmon->by, selmon->ww, bh);
+	resizebarwin(selmon);
+	if (showsystray) {
+		XWindowChanges wc;
+		if (!selmon->showbar)
+			wc.y = -bh;
+		else if (selmon->showbar) {
+			wc.y = 0;
+			if (!selmon->topbar)
+				wc.y = selmon->mh - bh;
+		}
+		XConfigureWindow(dpy, systray->win, CWY, &wc);
+	}
 	arrange(selmon);
 }
 
@@ -1790,11 +1995,17 @@ unmapnotify(XEvent *e)
 		else
 			unmanage(c, 0);
 	}
+	else if ((c = wintosystrayicon(ev->window))) {
+		removesystrayicon(c);
+		resizebarwin(selmon);
+		updatesystray();
+	}
 }
 
 void
 updatebars(void)
 {
+	unsigned int w;
 	Monitor *m;
 	XSetWindowAttributes wa = {
 		.override_redirect = True,
@@ -1804,10 +2015,15 @@ updatebars(void)
 	for (m = mons; m; m = m->next) {
 		if (m->barwin)
 			continue;
-		m->barwin = XCreateWindow(dpy, root, m->wx, m->by, m->ww, bh, 0, DefaultDepth(dpy, screen),
+		w = m->ww;
+		if (showsystray && m == systraytomon(m))
+			w -= getsystraywidth();
+		m->barwin = XCreateWindow(dpy, root, m->wx, m->by, w, bh, 0, DefaultDepth(dpy, screen),
 		                          CopyFromParent, DefaultVisual(dpy, screen),
 		                          CWOverrideRedirect|CWBackPixmap|CWEventMask, &wa);
 		XDefineCursor(dpy, m->barwin, cursor[CurNormal]->cursor);
+		if (showsystray && m == systraytomon(m))
+			XMapRaised(dpy, systray->win);
 		XMapRaised(dpy, m->barwin);
 	}
 }
@@ -1998,6 +2214,117 @@ updatestatus(void)
 }
 
 void
+updatesystrayicongeom(Client *i, int w, int h) {
+	if (i) {
+		i->h = bh;
+		if (w == h)
+			i->w = bh;
+		else if (h == bh)
+			i->w = w;
+		else
+			i->w = (int) ((float)bh * ((float)w / (float)h));
+		applysizehints(i, &(i->x), &(i->y), &(i->w), &(i->h), False);
+		/* force icons into the systray dimenons if they don't want to */
+		if (i->h > bh) {
+			if (i->w == i->h)
+				i->w = bh;
+			else
+				i->w = (int) ((float)bh * ((float)i->w / (float)i->h));
+			i->h = bh;
+		}
+	}
+}
+
+void
+updatesystrayiconstate(Client *i, XPropertyEvent *ev) {
+	long flags;
+	int code = 0;
+
+	if (!showsystray || !i || ev->atom != xatom[XembedInfo] ||
+			!(flags = getatomprop(i, xatom[XembedInfo])))
+		return;
+
+	if (flags & XEMBED_MAPPED && !i->tags) {
+		i->tags = 1;
+		code = XEMBED_WINDOW_ACTIVATE;
+		XMapRaised(dpy, i->win);
+		setclientstate(i, NormalState);
+	}
+	else if (!(flags & XEMBED_MAPPED) && i->tags) {
+		i->tags = 0;
+		code = XEMBED_WINDOW_DEACTIVATE;
+		XUnmapWindow(dpy, i->win);
+		setclientstate(i, WithdrawnState);
+	}
+	else
+		return;
+	sendevent(i->win, xatom[Xembed], StructureNotifyMask, CurrentTime, code, 0,
+			systray->win, XEMBED_EMBEDDED_VERSION);
+}
+
+void
+updatesystray(void) {
+	XSetWindowAttributes wa;
+	XWindowChanges wc;
+	Client *i;
+	Monitor *m = systraytomon(NULL);
+	unsigned int x = m->mx + m->mw;
+	unsigned int w = 1;
+
+	if (!showsystray)
+		return;
+	if (!systray) {
+		/* init systray */
+		if (!(systray = (Systray *)calloc(1, sizeof(Systray))))
+			die("fatal: could not malloc() %u bytes\n", sizeof(Systray));
+		systray->win = XCreateSimpleWindow(dpy, root, x, m->by, w, bh, 0, 0, scheme[SchemeSel].bg->pix);
+		wa.event_mask        = ButtonPressMask | ExposureMask;
+		wa.override_redirect = True;
+		wa.background_pixel  = scheme[SchemeNorm].bg->pix;
+		XSelectInput(dpy, systray->win, SubstructureNotifyMask);
+		XChangeProperty(dpy, systray->win, netatom[NetSystemTrayOrientation], XA_CARDINAL, 32,
+				PropModeReplace, (unsigned char *)&systrayorientation, 1);
+		XChangeWindowAttributes(dpy, systray->win, CWEventMask|CWOverrideRedirect|CWBackPixel, &wa);
+		XMapRaised(dpy, systray->win);
+		XSetSelectionOwner(dpy, netatom[NetSystemTray], systray->win, CurrentTime);
+		if (XGetSelectionOwner(dpy, netatom[NetSystemTray]) == systray->win) {
+			sendevent(root, xatom[Manager], StructureNotifyMask, CurrentTime, netatom[NetSystemTray], systray->win, 0, 0);
+			XSync(dpy, False);
+		}
+		else {
+			fprintf(stderr, "dwm: unable to obtain system tray.\n");
+			free(systray);
+			systray = NULL;
+			return;
+		}
+	}
+	for (w = 0, i = systray->icons; i; i = i->next) {
+		/* make sure the background color stays the same */
+		wa.background_pixel  = scheme[SchemeNorm].bg->pix;
+		XChangeWindowAttributes(dpy, i->win, CWBackPixel, &wa);
+		XMapRaised(dpy, i->win);
+		w += systrayspacing;
+		i->x = w;
+		XMoveResizeWindow(dpy, i->win, i->x, 0, i->w, i->h);
+		w += i->w;
+		if (i->mon != m)
+			i->mon = m;
+	}
+	w = w ? w + systrayspacing : 1;
+	x -= w;
+	XMoveResizeWindow(dpy, systray->win, x, m->by, w, bh);
+	wc.x = x; wc.y = m->by; wc.width = w; wc.height = bh;
+	wc.stack_mode = Above; wc.sibling = m->barwin;
+	XConfigureWindow(dpy, systray->win, CWX|CWY|CWWidth|CWHeight|CWSibling|CWStackMode, &wc);
+	XMapWindow(dpy, systray->win);
+	XMapSubwindows(dpy, systray->win);
+	/* redraw background */
+	XSetForeground(dpy, drw->gc, scheme[SchemeNorm].bg->pix);
+	XFillRectangle(dpy, systray->win, drw->gc, 0, 0, w, bh);
+	XSync(dpy, False);
+}
+
+void
 updatewindowtype(Client *c)
 {
 	Atom state = getatomprop(c, netatom[NetWMState]);
@@ -2070,6 +2397,16 @@ wintomon(Window w)
 	return selmon;
 }
 
+Client *
+wintosystrayicon(Window w) {
+	Client *i = NULL;
+
+	if (!showsystray || !w)
+		return i;
+	for (i = systray->icons; i && i->win != w; i = i->next);
+	return i;
+}
+
 /* There's no way to check accesses to destroyed windows, thus those cases are
  * ignored (especially on UnmapNotify's).  Other types of errors call Xlibs
  * default error handler, which may call exit.  */