Vanity gaps & foreign toplevel management patch for dwl.

00.vanity-gaps-and-foreign-toplevel.patch

diff --git a/Makefile b/Makefile
index 578194f..887a0f8 100644
--- a/Makefile
+++ b/Makefile
@@ -21,7 +21,8 @@ dwl: dwl.o util.o
 	$(CC) dwl.o util.o $(DWLCFLAGS) $(LDFLAGS) $(LDLIBS) -o $@
 dwl.o: dwl.c client.h config.h config.mk cursor-shape-v1-protocol.h \
 	pointer-constraints-unstable-v1-protocol.h wlr-layer-shell-unstable-v1-protocol.h \
-	wlr-output-power-management-unstable-v1-protocol.h xdg-shell-protocol.h
+	wlr-output-power-management-unstable-v1-protocol.h xdg-shell-protocol.h \
+	wlr-foreign-toplevel-management-unstable-v1-protocol.h
 util.o: util.c util.h
 
 # wayland-scanner is a tool which generates C headers and rigging for Wayland
@@ -45,6 +46,9 @@ wlr-output-power-management-unstable-v1-protocol.h:
 xdg-shell-protocol.h:
 	$(WAYLAND_SCANNER) server-header \
 		$(WAYLAND_PROTOCOLS)/stable/xdg-shell/xdg-shell.xml $@
+wlr-foreign-toplevel-management-unstable-v1-protocol.h:
+	$(WAYLAND_SCANNER) server-header \
+		protocols/wlr-foreign-toplevel-management-unstable-v1.xml $@
 
 config.h:
 	cp config.def.h $@
diff --git a/config.def.h b/config.def.h
index 22d2171..1dab73e 100644
--- a/config.def.h
+++ b/config.def.h
@@ -6,7 +6,13 @@
 /* appearance */
 static const int sloppyfocus               = 1;  /* focus follows mouse */
 static const int bypass_surface_visibility = 0;  /* 1 means idle inhibitors will disable idle tracking even if it's surface isn't visible  */
-static const unsigned int borderpx         = 1;  /* border pixel of windows */
+static const int smartgaps                 = 0;  /* 1 means no outer gap when there is only one window */
+static const int monoclegaps               = 0;  /* 1 means outer gaps in monocle layout */
+static const unsigned int borderpx         = 4;  /* border pixel of windows */
+static const unsigned int gappih           = 5; /* horiz inner gap between windows */
+static const unsigned int gappiv           = 5; /* vert inner gap between windows */
+static const unsigned int gappoh           = 5; /* horiz outer gap between windows and screen edge */
+static const unsigned int gappov           = 5; /* vert outer gap between windows and screen edge */
 static const float rootcolor[]             = COLOR(0x222222ff);
 static const float bordercolor[]           = COLOR(0x444444ff);
 static const float focuscolor[]            = COLOR(0x005577ff);
@@ -108,6 +114,7 @@ static const enum libinput_config_tap_button_map button_map = LIBINPUT_CONFIG_TA
 
 /* If you want to use the windows key for MODKEY, use WLR_MODIFIER_LOGO */
 #define MODKEY WLR_MODIFIER_ALT
+#define MOD4KEY WLR_MODIFIER_LOGO
 
 #define TAGKEYS(KEY,SKEY,TAG) \
 	{ MODKEY,                    KEY,            view,            {.ui = 1 << TAG} }, \
@@ -133,6 +140,22 @@ static const Key keys[] = {
 	{ MODKEY,                    XKB_KEY_d,          incnmaster,     {.i = -1} },
 	{ MODKEY,                    XKB_KEY_h,          setmfact,       {.f = -0.05f} },
 	{ MODKEY,                    XKB_KEY_l,          setmfact,       {.f = +0.05f} },
+	{ MODKEY|WLR_MODIFIER_LOGO,  XKB_KEY_h,          incgaps,       {.i = +1 } },
+	{ MODKEY|WLR_MODIFIER_LOGO,  XKB_KEY_l,          incgaps,       {.i = -1 } },
+	{ MODKEY|WLR_MODIFIER_LOGO|WLR_MODIFIER_SHIFT,   XKB_KEY_H,      incogaps,      {.i = +1 } },
+	{ MODKEY|WLR_MODIFIER_LOGO|WLR_MODIFIER_SHIFT,   XKB_KEY_L,      incogaps,      {.i = -1 } },
+	{ MODKEY|WLR_MODIFIER_LOGO|WLR_MODIFIER_CTRL,    XKB_KEY_h,      incigaps,      {.i = +1 } },
+	{ MODKEY|WLR_MODIFIER_LOGO|WLR_MODIFIER_CTRL,    XKB_KEY_l,      incigaps,      {.i = -1 } },
+	{ MODKEY|WLR_MODIFIER_LOGO,  XKB_KEY_0,          togglegaps,     {0} },
+	{ MODKEY|WLR_MODIFIER_LOGO|WLR_MODIFIER_SHIFT,   XKB_KEY_parenright,defaultgaps,    {0} },
+	{ MODKEY,                    XKB_KEY_y,          incihgaps,     {.i = +1 } },
+	{ MODKEY,                    XKB_KEY_o,          incihgaps,     {.i = -1 } },
+	{ MODKEY|WLR_MODIFIER_CTRL,  XKB_KEY_y,          incivgaps,     {.i = +1 } },
+	{ MODKEY|WLR_MODIFIER_CTRL,  XKB_KEY_o,          incivgaps,     {.i = -1 } },
+	{ MODKEY|WLR_MODIFIER_LOGO,  XKB_KEY_y,          incohgaps,     {.i = +1 } },
+	{ MODKEY|WLR_MODIFIER_LOGO,  XKB_KEY_o,          incohgaps,     {.i = -1 } },
+	{ MODKEY|WLR_MODIFIER_SHIFT, XKB_KEY_Y,          incovgaps,     {.i = +1 } },
+	{ MODKEY|WLR_MODIFIER_SHIFT, XKB_KEY_O,          incovgaps,     {.i = -1 } },
 	{ MODKEY,                    XKB_KEY_Return,     zoom,           {0} },
 	{ MODKEY,                    XKB_KEY_Tab,        view,           {0} },
 	{ MODKEY|WLR_MODIFIER_SHIFT, XKB_KEY_C,          killclient,     {0} },
@@ -172,5 +195,5 @@ static const Key keys[] = {
 static const Button buttons[] = {
 	{ MODKEY, BTN_LEFT,   moveresize,     {.ui = CurMove} },
 	{ MODKEY, BTN_MIDDLE, togglefloating, {0} },
-	{ MODKEY, BTN_RIGHT,  moveresize,     {.ui = CurResize} },
+	{ MOD4KEY, BTN_LEFT,  moveresize,     {.ui = CurResize} },
 };
diff --git a/dwl.c b/dwl.c
index 4816159..32497a1 100644
--- a/dwl.c
+++ b/dwl.c
@@ -24,6 +24,7 @@
 #include <wlr/types/wlr_data_device.h>
 #include <wlr/types/wlr_drm.h>
 #include <wlr/types/wlr_export_dmabuf_v1.h>
+#include <wlr/types/wlr_foreign_toplevel_management_v1.h>
 #include <wlr/types/wlr_fractional_scale_v1.h>
 #include <wlr/types/wlr_gamma_control_v1.h>
 #include <wlr/types/wlr_idle_inhibit_v1.h>
@@ -128,6 +129,11 @@ typedef struct {
 	struct wl_listener fullscreen;
 	struct wl_listener set_decoration_mode;
 	struct wl_listener destroy_decoration;
+	struct wlr_foreign_toplevel_handle_v1 *foreign_toplevel;
+	struct wl_listener factivate;
+	struct wl_listener fclose;
+	struct wl_listener ffullscreen;
+	struct wl_listener fdestroy;
 #ifdef XWAYLAND
 	struct wl_listener activate;
 	struct wl_listener associate;
@@ -197,6 +203,10 @@ struct Monitor {
 	struct wlr_box w; /* window area, layout-relative */
 	struct wl_list layers[4]; /* LayerSurface.link */
 	const Layout *lt[2];
+	int gappih;           /* horizontal gap between windows */
+	int gappiv;           /* vertical gap between windows */
+	int gappoh;           /* horizontal outer gaps */
+	int gappov;           /* vertical outer gaps */
 	unsigned int seltags;
 	unsigned int sellt;
 	uint32_t tagset[2];
@@ -271,6 +281,7 @@ static void createpopup(struct wl_listener *listener, void *data);
 static void cursorconstrain(struct wlr_pointer_constraint_v1 *constraint);
 static void cursorframe(struct wl_listener *listener, void *data);
 static void cursorwarptohint(void);
+static void defaultgaps(const Arg *arg);
 static void destroydecoration(struct wl_listener *listener, void *data);
 static void destroydragicon(struct wl_listener *listener, void *data);
 static void destroyidleinhibitor(struct wl_listener *listener, void *data);
@@ -290,6 +301,13 @@ static void fullscreennotify(struct wl_listener *listener, void *data);
 static void gpureset(struct wl_listener *listener, void *data);
 static void handlesig(int signo);
 static void incnmaster(const Arg *arg);
+static void incgaps(const Arg *arg);
+static void incigaps(const Arg *arg);
+static void incihgaps(const Arg *arg);
+static void incivgaps(const Arg *arg);
+static void incogaps(const Arg *arg);
+static void incohgaps(const Arg *arg);
+static void incovgaps(const Arg *arg);
 static void inputdevice(struct wl_listener *listener, void *data);
 static int keybinding(uint32_t mods, xkb_keysym_t sym);
 static void keypress(struct wl_listener *listener, void *data);
@@ -323,6 +341,7 @@ static void setcursor(struct wl_listener *listener, void *data);
 static void setcursorshape(struct wl_listener *listener, void *data);
 static void setfloating(Client *c, int floating);
 static void setfullscreen(Client *c, int fullscreen);
+static void setgaps(int oh, int ov, int ih, int iv);
 static void setlayout(const Arg *arg);
 static void setmfact(const Arg *arg);
 static void setmon(Client *c, Monitor *m, uint32_t newtags);
@@ -336,6 +355,7 @@ static void tagmon(const Arg *arg);
 static void tile(Monitor *m);
 static void togglefloating(const Arg *arg);
 static void togglefullscreen(const Arg *arg);
+static void togglegaps(const Arg *arg);
 static void toggletag(const Arg *arg);
 static void toggleview(const Arg *arg);
 static void unlocksession(struct wl_listener *listener, void *data);
@@ -351,8 +371,14 @@ static Monitor *xytomon(double x, double y);
 static void xytonode(double x, double y, struct wlr_surface **psurface,
 		Client **pc, LayerSurface **pl, double *nx, double *ny);
 static void zoom(const Arg *arg);
+static void createforeigntoplevel(Client *c);
+static void factivatenotify(struct wl_listener *listener, void *data);
+static void fclosenotify(struct wl_listener *listener, void *data);
+static void fdestroynotify(struct wl_listener *listener, void *data);
+static void ffullscreennotify(struct wl_listener *listener, void *data);
 
 /* variables */
+static const char broken[] = "broken";
 static pid_t child_pid = -1;
 static int locked;
 static void *exclusive_focus;
@@ -406,6 +432,8 @@ static struct wlr_box sgeom;
 static struct wl_list mons;
 static Monitor *selmon;
 
+static int enablegaps = 1;   /* enables gaps, used by togglegaps */
+
 /* global event handlers */
 static struct wl_listener cursor_axis = {.notify = axisnotify};
 static struct wl_listener cursor_button = {.notify = buttonpress};
@@ -436,6 +464,9 @@ static struct wl_listener request_start_drag = {.notify = requeststartdrag};
 static struct wl_listener start_drag = {.notify = startdrag};
 static struct wl_listener new_session_lock = {.notify = locksession};
 
+static struct wlr_foreign_toplevel_manager_v1 *foreign_toplevel_mgr;
+
+
 #ifdef XWAYLAND
 static void activatex11(struct wl_listener *listener, void *data);
 static void associatex11(struct wl_listener *listener, void *data);
@@ -487,6 +518,11 @@ applyrules(Client *c)
 	appid = client_get_appid(c);
 	title = client_get_title(c);
 
+	if (c->foreign_toplevel) {
+		wlr_foreign_toplevel_handle_v1_set_app_id(c->foreign_toplevel, appid);
+		wlr_foreign_toplevel_handle_v1_set_title(c->foreign_toplevel, title);
+	}
+
 	for (r = rules; r < END(rules); r++) {
 		if ((!r->title || strstr(title, r->title))
 				&& (!r->id || strstr(appid, r->id))) {
@@ -1052,6 +1088,11 @@ createmon(struct wl_listener *listener, void *data)
 	for (i = 0; i < LENGTH(m->layers); i++)
 		wl_list_init(&m->layers[i]);
 
+	m->gappih = gappih;
+	m->gappiv = gappiv;
+	m->gappoh = gappoh;
+	m->gappov = gappov;
+
 	wlr_output_state_init(&state);
 	/* Initialize monitor state using configured rules */
 	m->tagset[0] = m->tagset[1] = 1;
@@ -1220,6 +1261,12 @@ cursorframe(struct wl_listener *listener, void *data)
 	wlr_seat_pointer_notify_frame(seat);
 }
 
+void
+defaultgaps(const Arg *arg)
+{
+	setgaps(gappoh, gappov, gappih, gappiv);
+}
+
 void
 cursorwarptohint(void)
 {
@@ -1450,6 +1497,8 @@ focusclient(Client *c, int lift)
 			client_set_border_color(old_c, bordercolor);
 
 			client_activate_surface(old, 0);
+			if (old_c->foreign_toplevel)
+				wlr_foreign_toplevel_handle_v1_set_activated(old_c->foreign_toplevel, 0);
 		}
 	}
 	printstatus();
@@ -1468,6 +1517,8 @@ focusclient(Client *c, int lift)
 
 	/* Activate the new client */
 	client_activate_surface(client_surface(c), 1);
+	if (c->foreign_toplevel)
+		wlr_foreign_toplevel_handle_v1_set_activated(c->foreign_toplevel, 1);
 }
 
 void
@@ -1572,6 +1623,83 @@ incnmaster(const Arg *arg)
 	arrange(selmon);
 }
 
+void
+incgaps(const Arg *arg)
+{
+	setgaps(
+		selmon->gappoh + arg->i,
+		selmon->gappov + arg->i,
+		selmon->gappih + arg->i,
+		selmon->gappiv + arg->i
+	);
+}
+
+void
+incigaps(const Arg *arg)
+{
+	setgaps(
+		selmon->gappoh,
+		selmon->gappov,
+		selmon->gappih + arg->i,
+		selmon->gappiv + arg->i
+	);
+}
+
+void
+incihgaps(const Arg *arg)
+{
+	setgaps(
+		selmon->gappoh,
+		selmon->gappov,
+		selmon->gappih + arg->i,
+		selmon->gappiv
+	);
+}
+
+void
+incivgaps(const Arg *arg)
+{
+	setgaps(
+		selmon->gappoh,
+		selmon->gappov,
+		selmon->gappih,
+		selmon->gappiv + arg->i
+	);
+}
+
+void
+incogaps(const Arg *arg)
+{
+	setgaps(
+		selmon->gappoh + arg->i,
+		selmon->gappov + arg->i,
+		selmon->gappih,
+		selmon->gappiv
+	);
+}
+
+void
+incohgaps(const Arg *arg)
+{
+	setgaps(
+		selmon->gappoh + arg->i,
+		selmon->gappov,
+		selmon->gappih,
+		selmon->gappiv
+	);
+}
+
+void
+incovgaps(const Arg *arg)
+{
+	setgaps(
+		selmon->gappoh,
+		selmon->gappov + arg->i,
+		selmon->gappih,
+		selmon->gappiv
+	);
+}
+
 void
 inputdevice(struct wl_listener *listener, void *data)
 {
@@ -1769,6 +1897,8 @@ mapnotify(struct wl_listener *listener, void *data)
 		c->border[i]->node.data = c;
 	}
 
+	createforeigntoplevel(c);
+
 	/* Initialize client geometry with room for border */
 	client_set_tiled(c, WLR_EDGE_TOP | WLR_EDGE_BOTTOM | WLR_EDGE_LEFT | WLR_EDGE_RIGHT);
 	c->geom.width += 2 * c->bw;
@@ -1825,8 +1955,12 @@ monocle(Monitor *m)
 	wl_list_for_each(c, &clients, link) {
 		if (!VISIBLEON(c, m) || c->isfloating || c->isfullscreen)
 			continue;
-		resize(c, m->w, 0);
 		n++;
+		if (!monoclegaps)
+			resize(c, m->w, 0);
+		else
+			resize(c, (struct wlr_box){.x = m->w.x + gappoh, .y = m->w.y + gappov,
+				.width = m->w.width - 2 * gappoh, .height = m->w.height - 2 * gappov}, 0);
 	}
 	if (n)
 		snprintf(m->ltsymbol, LENGTH(m->ltsymbol), "[%d]", n);
@@ -2363,6 +2497,16 @@ setfullscreen(Client *c, int fullscreen)
 	printstatus();
 }
 
+void
+setgaps(int oh, int ov, int ih, int iv)
+{
+	selmon->gappoh = MAX(oh, 0);
+	selmon->gappov = MAX(ov, 0);
+	selmon->gappih = MAX(ih, 0);
+	selmon->gappiv = MAX(iv, 0);
+	arrange(selmon);
+}
+
 void
 setlayout(const Arg *arg)
 {
@@ -2403,12 +2547,17 @@ setmon(Client *c, Monitor *m, uint32_t newtags)
 	c->prev = c->geom;
 
 	/* Scene graph sends surface leave/enter events on move and resize */
-	if (oldmon)
+	if (oldmon) {
+		if (c->foreign_toplevel)
+			wlr_foreign_toplevel_handle_v1_output_leave(c->foreign_toplevel, oldmon->wlr_output);
 		arrange(oldmon);
+	}
 	if (m) {
 		/* Make sure window actually overlaps with the monitor */
 		resize(c, c->geom, 0);
 		c->tags = newtags ? newtags : m->tagset[m->seltags]; /* assign tags of target monitor */
+		if (c->foreign_toplevel)
+			wlr_foreign_toplevel_handle_v1_output_enter(c->foreign_toplevel, m->wlr_output);
 		setfullscreen(c, c->isfullscreen); /* This will call arrange(c->mon) */
 		setfloating(c, c->isfloating);
 	}
@@ -2526,6 +2675,9 @@ setup(void)
 
 	wlr_scene_set_gamma_control_manager_v1(scene, wlr_gamma_control_manager_v1_create(dpy));
 
+	/* Initializes foreign toplevel management */
+	foreign_toplevel_mgr = wlr_foreign_toplevel_manager_v1_create(dpy);
+
 	power_mgr = wlr_output_power_manager_v1_create(dpy);
 	wl_signal_add(&power_mgr->events.set_mode, &output_power_mgr_set_mode);
 
@@ -2707,7 +2859,7 @@ tagmon(const Arg *arg)
 void
 tile(Monitor *m)
 {
-	unsigned int mw, my, ty;
+	unsigned int mw, my, ty, h, r, oe = enablegaps, ie = enablegaps;
 	int i, n = 0;
 	Client *c;
 
@@ -2717,22 +2869,31 @@ tile(Monitor *m)
 	if (n == 0)
 		return;
 
+	if (smartgaps == n) {
+		oe = 0; // outer gaps disabled
+	}
+
 	if (n > m->nmaster)
-		mw = m->nmaster ? (int)roundf(m->w.width * m->mfact) : 0;
+		mw = m->nmaster ? (int)roundf((m->w.width + m->gappiv*ie) * m->mfact) : 0;
 	else
-		mw = m->w.width;
-	i = my = ty = 0;
+		mw = m->w.width - 2*m->gappov*oe + m->gappiv*ie;
+	i = 0;
+	my = ty = m->gappoh*oe;
 	wl_list_for_each(c, &clients, link) {
 		if (!VISIBLEON(c, m) || c->isfloating || c->isfullscreen)
 			continue;
 		if (i < m->nmaster) {
-			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;
+			r = MIN(n, m->nmaster) - i;
+			h = (m->w.height - my - m->gappoh*oe - m->gappih*ie * (r - 1)) / r;
+			resize(c, (struct wlr_box){.x = m->w.x + m->gappov*oe, .y = m->w.y + my,
+				.width = mw - m->gappiv*ie, .height = h}, 0);
+			my += c->geom.height + m->gappih*ie;
 		} else {
-			resize(c, (struct wlr_box){.x = m->w.x + mw, .y = m->w.y + ty,
-				.width = m->w.width - mw, .height = (m->w.height - ty) / (n - i)}, 0);
-			ty += c->geom.height;
+			r = n - i;
+			h = (m->w.height - ty - m->gappoh*oe - m->gappih*ie * (r - 1)) / r;
+			resize(c, (struct wlr_box){.x = m->w.x + mw + m->gappov*oe, .y = m->w.y + ty,
+				.width = m->w.width - mw - 2*m->gappov*oe, .height = h}, 0);
+			ty += c->geom.height + m->gappih*ie;
 		}
 		i++;
 	}
@@ -2755,6 +2916,13 @@ togglefullscreen(const Arg *arg)
 		setfullscreen(sel, !sel->isfullscreen);
 }
 
+void
+togglegaps(const Arg *arg)
+{
+	enablegaps = !enablegaps;
+	arrange(selmon);
+}
+
 void
 toggletag(const Arg *arg)
 {
@@ -2826,6 +2994,11 @@ unmapnotify(struct wl_listener *listener, void *data)
 		wl_list_remove(&c->flink);
 	}
 
+	if (c->foreign_toplevel) {
+		wlr_foreign_toplevel_handle_v1_destroy(c->foreign_toplevel);
+		c->foreign_toplevel = NULL;
+	}
+
 	wlr_scene_node_destroy(&c->scene->node);
 	printstatus();
 	motionnotify(0, NULL, 0, 0, 0, 0);
@@ -2941,6 +3114,12 @@ void
 updatetitle(struct wl_listener *listener, void *data)
 {
 	Client *c = wl_container_of(listener, c, set_title);
+	if (c->foreign_toplevel) {
+		const char *title;
+		if (!(title = client_get_title(c)))
+			title = broken;
+		wlr_foreign_toplevel_handle_v1_set_title(c->foreign_toplevel, title);
+	}
 	if (c == focustop(c->mon))
 		printstatus();
 }
@@ -3070,6 +3249,54 @@ zoom(const Arg *arg)
 	arrange(selmon);
 }
 
+void
+createforeigntoplevel(Client *c)
+{
+	c->foreign_toplevel = wlr_foreign_toplevel_handle_v1_create(foreign_toplevel_mgr);
+
+	LISTEN(&c->foreign_toplevel->events.request_activate, &c->factivate, factivatenotify);
+	LISTEN(&c->foreign_toplevel->events.request_close, &c->fclose, fclosenotify);
+	LISTEN(&c->foreign_toplevel->events.request_fullscreen, &c->ffullscreen, ffullscreennotify);
+	LISTEN(&c->foreign_toplevel->events.destroy, &c->fdestroy, fdestroynotify);
+}
+
+void
+factivatenotify(struct wl_listener *listener, void *data)
+{
+	Client *c = wl_container_of(listener, c, factivate);
+	if (c->mon == selmon) {
+		c->tags = c->mon->tagset[c->mon->seltags];
+	} else {
+		setmon(c, selmon, 0);
+	}
+	focusclient(c, 1);
+	arrange(c->mon);
+}
+
+void
+fclosenotify(struct wl_listener *listener, void *data)
+{
+	Client *c = wl_container_of(listener, c, fclose);
+	client_send_close(c);
+}
+
+void
+ffullscreennotify(struct wl_listener *listener, void *data) {
+	Client *c = wl_container_of(listener, c, ffullscreen);
+	struct wlr_foreign_toplevel_handle_v1_fullscreen_event *event = data;
+	setfullscreen(c, event->fullscreen);
+}
+
+void
+fdestroynotify(struct wl_listener *listener, void *data)
+{
+	Client *c = wl_container_of(listener, c, fdestroy);
+	wl_list_remove(&c->factivate.link);
+	wl_list_remove(&c->fclose.link);
+	wl_list_remove(&c->ffullscreen.link);
+	wl_list_remove(&c->fdestroy.link);
+}
+
 #ifdef XWAYLAND
 void
 activatex11(struct wl_listener *listener, void *data)

wlr-foreign-toplevel-management-unstable-v1.xml

<?xml version="1.0" encoding="UTF-8"?>
<protocol name="wlr_foreign_toplevel_management_unstable_v1">
  <copyright>
    Copyright © 2018 Ilia Bozhinov

    Permission to use, copy, modify, distribute, and sell this
    software and its documentation for any purpose is hereby granted
    without fee, provided that the above copyright notice appear in
    all copies and that both that copyright notice and this permission
    notice appear in supporting documentation, and that the name of
    the copyright holders not be used in advertising or publicity
    pertaining to distribution of the software without specific,
    written prior permission.  The copyright holders make no
    representations about the suitability of this software for any
    purpose.  It is provided "as is" without express or implied
    warranty.

    THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS
    SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
    FITNESS, IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY
    SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
    WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
    AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
    ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
    THIS SOFTWARE.
  </copyright>

  <interface name="zwlr_foreign_toplevel_manager_v1" version="3">
    <description summary="list and control opened apps">
      The purpose of this protocol is to enable the creation of taskbars
      and docks by providing them with a list of opened applications and
      letting them request certain actions on them, like maximizing, etc.

      After a client binds the zwlr_foreign_toplevel_manager_v1, each opened
      toplevel window will be sent via the toplevel event
    </description>

    <event name="toplevel">
      <description summary="a toplevel has been created">
        This event is emitted whenever a new toplevel window is created. It
        is emitted for all toplevels, regardless of the app that has created
        them.

        All initial details of the toplevel(title, app_id, states, etc.) will
        be sent immediately after this event via the corresponding events in
        zwlr_foreign_toplevel_handle_v1.
      </description>
      <arg name="toplevel" type="new_id" interface="zwlr_foreign_toplevel_handle_v1"/>
    </event>

    <request name="stop">
      <description summary="stop sending events">
        Indicates the client no longer wishes to receive events for new toplevels.
        However the compositor may emit further toplevel_created events, until
        the finished event is emitted.

        The client must not send any more requests after this one.
      </description>
    </request>

    <event name="finished" type="destructor">
      <description summary="the compositor has finished with the toplevel manager">
        This event indicates that the compositor is done sending events to the
        zwlr_foreign_toplevel_manager_v1. The server will destroy the object
        immediately after sending this request, so it will become invalid and
        the client should free any resources associated with it.
      </description>
    </event>
  </interface>

  <interface name="zwlr_foreign_toplevel_handle_v1" version="3">
    <description summary="an opened toplevel">
      A zwlr_foreign_toplevel_handle_v1 object represents an opened toplevel
      window. Each app may have multiple opened toplevels.

      Each toplevel has a list of outputs it is visible on, conveyed to the
      client with the output_enter and output_leave events.
    </description>

    <event name="title">
      <description summary="title change">
        This event is emitted whenever the title of the toplevel changes.
      </description>
      <arg name="title" type="string"/>
    </event>

    <event name="app_id">
      <description summary="app-id change">
        This event is emitted whenever the app-id of the toplevel changes.
      </description>
      <arg name="app_id" type="string"/>
    </event>

    <event name="output_enter">
      <description summary="toplevel entered an output">
        This event is emitted whenever the toplevel becomes visible on
        the given output. A toplevel may be visible on multiple outputs.
      </description>
      <arg name="output" type="object" interface="wl_output"/>
    </event>

    <event name="output_leave">
      <description summary="toplevel left an output">
        This event is emitted whenever the toplevel stops being visible on
        the given output. It is guaranteed that an entered-output event
        with the same output has been emitted before this event.
      </description>
      <arg name="output" type="object" interface="wl_output"/>
    </event>

    <request name="set_maximized">
      <description summary="requests that the toplevel be maximized">
        Requests that the toplevel be maximized. If the maximized state actually
        changes, this will be indicated by the state event.
      </description>
    </request>

    <request name="unset_maximized">
      <description summary="requests that the toplevel be unmaximized">
        Requests that the toplevel be unmaximized. If the maximized state actually
        changes, this will be indicated by the state event.
      </description>
    </request>

    <request name="set_minimized">
      <description summary="requests that the toplevel be minimized">
        Requests that the toplevel be minimized. If the minimized state actually
        changes, this will be indicated by the state event.
      </description>
    </request>

    <request name="unset_minimized">
      <description summary="requests that the toplevel be unminimized">
        Requests that the toplevel be unminimized. If the minimized state actually
        changes, this will be indicated by the state event.
      </description>
    </request>

    <request name="activate">
      <description summary="activate the toplevel">
        Request that this toplevel be activated on the given seat.
        There is no guarantee the toplevel will be actually activated.
      </description>
      <arg name="seat" type="object" interface="wl_seat"/>
    </request>

    <enum name="state">
      <description summary="types of states on the toplevel">
        The different states that a toplevel can have. These have the same meaning
        as the states with the same names defined in xdg-toplevel
      </description>

      <entry name="maximized"  value="0" summary="the toplevel is maximized"/>
      <entry name="minimized"  value="1" summary="the toplevel is minimized"/>
      <entry name="activated"  value="2" summary="the toplevel is active"/>
      <entry name="fullscreen" value="3" summary="the toplevel is fullscreen" since="2"/>
    </enum>

    <event name="state">
      <description summary="the toplevel state changed">
        This event is emitted immediately after the zlw_foreign_toplevel_handle_v1
        is created and each time the toplevel state changes, either because of a
        compositor action or because of a request in this protocol.
      </description>

      <arg name="state" type="array"/>
    </event>

    <event name="done">
      <description summary="all information about the toplevel has been sent">
        This event is sent after all changes in the toplevel state have been
        sent.

        This allows changes to the zwlr_foreign_toplevel_handle_v1 properties
        to be seen as atomic, even if they happen via multiple events.
      </description>
    </event>

    <request name="close">
      <description summary="request that the toplevel be closed">
        Send a request to the toplevel to close itself. The compositor would
        typically use a shell-specific method to carry out this request, for
        example by sending the xdg_toplevel.close event. However, this gives
        no guarantees the toplevel will actually be destroyed. If and when
        this happens, the zwlr_foreign_toplevel_handle_v1.closed event will
        be emitted.
      </description>
    </request>

    <request name="set_rectangle">
      <description summary="the rectangle which represents the toplevel">
        The rectangle of the surface specified in this request corresponds to
        the place where the app using this protocol represents the given toplevel.
        It can be used by the compositor as a hint for some operations, e.g
        minimizing. The client is however not required to set this, in which
        case the compositor is free to decide some default value.

        If the client specifies more than one rectangle, only the last one is
        considered.

        The dimensions are given in surface-local coordinates.
        Setting width=height=0 removes the already-set rectangle.
      </description>

      <arg name="surface" type="object" interface="wl_surface"/>
      <arg name="x" type="int"/>
      <arg name="y" type="int"/>
      <arg name="width" type="int"/>
      <arg name="height" type="int"/>
    </request>

    <enum name="error">
      <entry name="invalid_rectangle" value="0"
        summary="the provided rectangle is invalid"/>
    </enum>

    <event name="closed">
      <description summary="this toplevel has been destroyed">
        This event means the toplevel has been destroyed. It is guaranteed there
        won't be any more events for this zwlr_foreign_toplevel_handle_v1. The
        toplevel itself becomes inert so any requests will be ignored except the
        destroy request.
      </description>
    </event>

    <request name="destroy" type="destructor">
      <description summary="destroy the zwlr_foreign_toplevel_handle_v1 object">
        Destroys the zwlr_foreign_toplevel_handle_v1 object.

        This request should be called either when the client does not want to
        use the toplevel anymore or after the closed event to finalize the
        destruction of the object.
      </description>
    </request>

    <!-- Version 2 additions -->

    <request name="set_fullscreen" since="2">
      <description summary="request that the toplevel be fullscreened">
        Requests that the toplevel be fullscreened on the given output. If the
        fullscreen state and/or the outputs the toplevel is visible on actually
        change, this will be indicated by the state and output_enter/leave
        events.

        The output parameter is only a hint to the compositor. Also, if output
        is NULL, the compositor should decide which output the toplevel will be
        fullscreened on, if at all.
      </description>
      <arg name="output" type="object" interface="wl_output" allow-null="true"/>
    </request>

    <request name="unset_fullscreen" since="2">
      <description summary="request that the toplevel be unfullscreened">
        Requests that the toplevel be unfullscreened. If the fullscreen state
        actually changes, this will be indicated by the state event.
      </description>
    </request>

    <!-- Version 3 additions -->

    <event name="parent" since="3">
      <description summary="parent change">
        This event is emitted whenever the parent of the toplevel changes.

        No event is emitted when the parent handle is destroyed by the client.
      </description>
      <arg name="parent" type="object" interface="zwlr_foreign_toplevel_handle_v1" allow-null="true"/>
    </event>
  </interface>
</protocol>

wlr-output-power-management-unstable-v1.xml

<?xml version="1.0" encoding="UTF-8"?>
<protocol name="wlr_output_power_management_unstable_v1">
  <copyright>
    Copyright © 2019 Purism SPC

    Permission is hereby granted, free of charge, to any person obtaining a
    copy of this software and associated documentation files (the "Software"),
    to deal in the Software without restriction, including without limitation
    the rights to use, copy, modify, merge, publish, distribute, sublicense,
    and/or sell copies of the Software, and to permit persons to whom the
    Software is furnished to do so, subject to the following conditions:

    The above copyright notice and this permission notice (including the next
    paragraph) shall be included in all copies or substantial portions of the
    Software.

    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
    THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
    FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
    DEALINGS IN THE SOFTWARE.
  </copyright>

  <description summary="Control power management modes of outputs">
    This protocol allows clients to control power management modes
    of outputs that are currently part of the compositor space. The
    intent is to allow special clients like desktop shells to power
    down outputs when the system is idle.

    To modify outputs not currently part of the compositor space see
    wlr-output-management.

    Warning! The protocol described in this file is experimental and
    backward incompatible changes may be made. Backward compatible changes
    may be added together with the corresponding interface version bump.
    Backward incompatible changes are done by bumping the version number in
    the protocol and interface names and resetting the interface version.
    Once the protocol is to be declared stable, the 'z' prefix and the
    version number in the protocol and interface names are removed and the
    interface version number is reset.
  </description>

  <interface name="zwlr_output_power_manager_v1" version="1">
    <description summary="manager to create per-output power management">
      This interface is a manager that allows creating per-output power
      management mode controls.
    </description>

    <request name="get_output_power">
      <description summary="get a power management for an output">
        Create a output power management mode control that can be used to
        adjust the power management mode for a given output.
      </description>
      <arg name="id" type="new_id" interface="zwlr_output_power_v1"/>
      <arg name="output" type="object" interface="wl_output"/>
    </request>

    <request name="destroy" type="destructor">
      <description summary="destroy the manager">
        All objects created by the manager will still remain valid, until their
        appropriate destroy request has been called.
      </description>
    </request>
  </interface>

  <interface name="zwlr_output_power_v1" version="1">
    <description summary="adjust power management mode for an output">
      This object offers requests to set the power management mode of
      an output.
    </description>

    <enum name="mode">
      <entry name="off" value="0"
             summary="Output is turned off."/>
      <entry name="on" value="1"
             summary="Output is turned on, no power saving"/>
    </enum>

    <enum name="error">
      <entry name="invalid_mode" value="1" summary="inexistent power save mode"/>
    </enum>

    <request name="set_mode">
      <description summary="Set an outputs power save mode">
        Set an output's power save mode to the given mode. The mode change
        is effective immediately. If the output does not support the given
        mode a failed event is sent.
      </description>
      <arg name="mode" type="uint" enum="mode" summary="the power save mode to set"/>
    </request>

    <event name="mode">
      <description summary="Report a power management mode change">
        Report the power management mode change of an output.

        The mode event is sent after an output changed its power
        management mode. The reason can be a client using set_mode or the
        compositor deciding to change an output's mode.
        This event is also sent immediately when the object is created
        so the client is informed about the current power management mode.
      </description>
      <arg name="mode" type="uint" enum="mode"
           summary="the output's new power management mode"/>
    </event>

    <event name="failed">
      <description summary="object no longer valid">
        This event indicates that the output power management mode control
        is no longer valid. This can happen for a number of reasons,
        including:
        - The output doesn't support power management
        - Another client already has exclusive power management mode control
          for this output
        - The output disappeared

        Upon receiving this event, the client should destroy this object.
      </description>
    </event>

    <request name="destroy" type="destructor">
      <description summary="destroy this power management">
        Destroys the output power management mode control object.
      </description>
    </request>
  </interface>
</protocol>

xfce4-dwl.desktop

[Desktop Entry]
Version=1.0
Name=Xfce Session (Wayland with dwl)
Comment=Use this session to run Xfce as your desktop environment
Exec=/usr/bin/dwl -s /usr/bin/xfce4-session
Icon=
Type=Application
DesktopNames=XFCE
Keywords=xfce;wayland;desktop;environment;session;

Additional window(s) rule.

static const Rule rules[] = {
	/* app_id             title       tags mask     isfloating   monitor */
	/* examples: */
	{ "Gimp_EXAMPLE",     NULL,       0,            1,           -1 }, /* Start on currently visible tags floating, not tiled */
	{ "firefox_EXAMPLE",  NULL,       1 << 8,       0,           -1 }, /* Start on ONLY tag "9" */
	{ "imv",     NULL,       0,            1,           -1 }, 			
	{ "mpv",     NULL,       0,            1,           -1 }, 			
	{ NULL,     "Panel Preferences",       0,            1,           -1 }, 	
	{ NULL,     "Display",       0,            1,           -1 }, 			
	{ NULL,     "Settings",       0,            1,           -1 }, 			
	{ NULL,     "Keyboard",       0,            1,           -1 }, 			
	{ NULL,     "Mouse and Touchpad",       0,            1,           -1 }, 	
	{ NULL,     "Power Manager",       0,            1,           -1 }, 		
	{ NULL,     "Session and Startup",       0,            1,           -1 }, 	
	{ NULL,     "About the Xfce Desktop Environment",       0,            1,           -1 }, 
};

Updated to suit commit faa56cc9b9718e1b195a02682836fe040963eb7d.