swaybar: add tray interface

include/swaybar/bar.h

@@ -1,6 +1,7 @@
 #ifndef _SWAYBAR_BAR_H
 #define _SWAYBAR_BAR_H
 #include <wayland-client.h>
+#include "config.h"
 #include "input.h"
 #include "pool-buffer.h"
 #include "wlr-layer-shell-unstable-v1-client-protocol.h"
@@ -8,6 +9,9 @@
 
 struct swaybar_config;
 struct swaybar_output;
+#if HAVE_TRAY
+struct swaybar_tray;
+#endif
 struct swaybar_workspace;
 struct loop;
 
@@ -38,6 +42,10 @@ struct swaybar {
 	int ipc_socketfd;
 
 	struct wl_list outputs; // swaybar_output::link
+
+#if HAVE_TRAY
+	struct swaybar_tray *tray;
+#endif
 };
 
 struct swaybar_output {

include/swaybar/tray/tray.h

@@ -0,0 +1,28 @@
+#ifndef _SWAYBAR_TRAY_TRAY_H
+#define _SWAYBAR_TRAY_TRAY_H
+
+#include "config.h"
+#ifdef HAVE_SYSTEMD
+#include <systemd/sd-bus.h>
+#elif HAVE_ELOGIND
+#include <elogind/sd-bus.h>
+#endif
+#include <cairo.h>
+#include <stdint.h>
+
+struct swaybar;
+struct swaybar_output;
+
+struct swaybar_tray {
+	struct swaybar *bar;
+
+	int fd;
+	sd_bus *bus;
+};
+
+struct swaybar_tray *create_tray(struct swaybar *bar);
+void destroy_tray(struct swaybar_tray *tray);
+void tray_in(int fd, short mask, void *data);
+uint32_t render_tray(cairo_t *cairo, struct swaybar_output *output, double *x);
+
+#endif

meson.build

@@ -66,6 +66,7 @@ endif
 conf_data.set10('HAVE_GDK_PIXBUF', gdk_pixbuf.found())
 conf_data.set10('HAVE_SYSTEMD', systemd.found())
 conf_data.set10('HAVE_ELOGIND', elogind.found())
+conf_data.set10('HAVE_TRAY', get_option('enable-tray') and (systemd.found() or elogind.found()))
 
 if not systemd.found() and not elogind.found()
 	warning('The sway binary must be setuid when compiled without (e)logind')

meson_options.txt

@@ -6,3 +6,4 @@ option('zsh-completions', type: 'boolean', value: true, description: 'Install zs
 option('bash-completions', type: 'boolean', value: true, description: 'Install bash shell completions.')
 option('fish-completions', type: 'boolean', value: true, description: 'Install fish shell completions.')
 option('enable-xwayland', type: 'boolean', value: true, description: 'Enable support for X11 applications')
+option('enable-tray', type: 'boolean', value: false, description: 'Enable support for swaybar tray')

swaybar/bar.c

@@ -18,6 +18,9 @@
 #include "swaybar/ipc.h"
 #include "swaybar/status_line.h"
 #include "swaybar/render.h"
+#if HAVE_TRAY
+#include "swaybar/tray/tray.h"
+#endif
 #include "ipc-client.h"
 #include "list.h"
 #include "log.h"
@@ -362,6 +365,10 @@ bool bar_setup(struct swaybar *bar, const char *socket_path) {
 	pointer->cursor_surface = wl_compositor_create_surface(bar->compositor);
 	assert(pointer->cursor_surface);
 
+#if HAVE_TRAY
+	bar->tray = create_tray(bar);
+#endif
+
 	if (bar->config->workspace_buttons) {
 		ipc_get_workspaces(bar);
 	}
@@ -403,6 +410,11 @@ void bar_run(struct swaybar *bar) {
 		loop_add_fd(bar->eventloop, bar->status->read_fd, POLLIN,
 				status_in, bar);
 	}
+#if HAVE_TRAY
+	if (bar->tray) {
+		loop_add_fd(bar->eventloop, bar->tray->fd, POLLIN, tray_in, bar->tray->bus);
+	}
+#endif
 	while (1) {
 		errno = 0;
 		if (wl_display_flush(bar->display) == -1 && errno != EAGAIN) {
@@ -420,6 +432,9 @@ static void free_outputs(struct wl_list *list) {
 }
 
 void bar_teardown(struct swaybar *bar) {
+#if HAVE_TRAY
+	destroy_tray(bar->tray);
+#endif
 	free_outputs(&bar->outputs);
 	if (bar->config) {
 		free_config(bar->config);

swaybar/meson.build

@@ -1,3 +1,28 @@
+tray_files = get_option('enable-tray') ? [
+	'tray/tray.c',
+] : []
+
+swaybar_deps = [
+	cairo,
+	client_protos,
+	gdk_pixbuf,
+	jsonc,
+	math,
+	pango,
+	pangocairo,
+	rt,
+	wayland_client,
+	wayland_cursor,
+	wlroots,
+]
+if get_option('enable-tray')
+	if systemd.found()
+		swaybar_deps += systemd
+	elif elogind.found()
+		swaybar_deps += elogind
+	endif
+endif
+
 executable(
 	'swaybar', [
 		'bar.c',
@@ -8,21 +33,10 @@ executable(
 		'main.c',
 		'render.c',
 		'status_line.c',
+		tray_files
 	],
 	include_directories: [sway_inc],
-	dependencies: [
+	dependencies: swaybar_deps,
-		cairo,
-		client_protos,
-		gdk_pixbuf,
-		jsonc,
-		math,
-		pango,
-		pangocairo,
-		rt,
-		wayland_client,
-		wayland_cursor,
-		wlroots,
-	],
 	link_with: [lib_sway_common, lib_sway_client],
 	install_rpath : rpathdir,
 	install: true

swaybar/render.c

@@ -14,6 +14,9 @@
 #include "swaybar/ipc.h"
 #include "swaybar/render.h"
 #include "swaybar/status_line.h"
+#if HAVE_TRAY
+#include "swaybar/tray/tray.h"
+#endif
 #include "wlr-layer-shell-unstable-v1-client-protocol.h"
 
 static const int WS_HORIZONTAL_PADDING = 5;
@@ -453,6 +456,12 @@ static uint32_t render_to_cairo(cairo_t *cairo, struct swaybar_output *output) {
 	 * utilize the available space.
 	 */
 	double x = output->width * output->scale;
+#if HAVE_TRAY
+	if (bar->tray) {
+		uint32_t h = render_tray(cairo, output, &x);
+		max_height = h > max_height ? h : max_height;
+	}
+#endif
 	if (bar->status) {
 		uint32_t h = render_status_line(cairo, output, &x);
 		max_height = h > max_height ? h : max_height;

swaybar/tray/tray.c

@@ -0,0 +1,21 @@
+#include <cairo.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include "swaybar/bar.h"
+#include "swaybar/tray/tray.h"
+#include "log.h"
+
+struct swaybar_tray *create_tray(struct swaybar *bar) {
+	wlr_log(WLR_DEBUG, "Initializing tray");
+	return NULL;
+}
+
+void destroy_tray(struct swaybar_tray *tray) {
+}
+
+void tray_in(int fd, short mask, void *data) {
+}
+
+uint32_t render_tray(cairo_t *cairo, struct swaybar_output *output, double *x) {
+	return 0; // placeholder
+}