panel menu: Add logout button

The button runs the command from the config key panel/menu_logout_command.

Closes #30 and #41.

Author: soreau

.gitmodules

@@ -4,3 +4,6 @@
 [submodule "subprojects/gvc"]
 	path = subprojects/gvc
 	url = https://github.com/GNOME/libgnome-volume-control
+[submodule "subprojects/wayland-logout"]
+	path = subprojects/wayland-logout
+	url = https://github.com/soreau/wayland-logout

meson.build

@@ -22,6 +22,8 @@ gtklayershell  = dependency('gtk-layer-shell-0', version: '>= 0.1', fallback: ['
 libpulse       = dependency('libpulse', required : get_option('pulse'))
 libgvc         = subproject('gvc', default_options: ['static=true'], required : get_option('pulse'))
 
+wayland_logout = subproject('wayland-logout')
+
 if libpulse.found()
   libgvc = libgvc.get_variable('libgvc_dep')
   add_project_arguments('-DHAVE_PULSE=1', language : 'cpp')

metadata/panel.xml

@@ -169,6 +169,10 @@
 		<hint>file</hint>
 		<default></default>
 	</option>
+	<option name="menu_logout_command" type="string">
+		<_short>Menu Logout Command</_short>
+		<default>wayland-logout</default>
+	</option>
 	</group>
 	<group>
 	<_short>Volume</_short>

src/panel/widgets/menu.cpp

@@ -303,6 +303,11 @@ void WayfireMenu::update_popover_layout()
     popover_layout_box.show_all();
 }
 
+void WayfireMenu::on_logout_click()
+{
+    g_spawn_command_line_async(std::string(menu_logout_command).c_str(), NULL);
+}
+
 void WayfireMenu::init(Gtk::HBox *container)
 {
     menu_icon.set_callback([=] () { update_icon(); });
@@ -324,6 +329,14 @@ void WayfireMenu::init(Gtk::HBox *container)
     container->pack_start(hbox, false, false);
     hbox.pack_start(*button, false, false);
 
+    logout_button.set_image_from_icon_name("system-shutdown", Gtk::ICON_SIZE_DIALOG);
+    logout_button.signal_clicked().connect_notify(
+        sigc::mem_fun(this, &WayfireMenu::on_logout_click));
+    logout_button.property_margin().set_value(20);
+    logout_button.set_margin_right(35);
+    hbox_bottom.pack_end(logout_button, false, false);
+    popover_layout_box.pack_end(hbox_bottom);
+
     load_menu_items_all();
     update_popover_layout();
 

src/panel/widgets/menu.hpp

@@ -37,12 +37,13 @@ class WfMenuMenuItem : public Gtk::HBox
 class WayfireMenu : public WayfireWidget
 {
     Gtk::Box flowbox_container;
-    Gtk::HBox hbox;
+    Gtk::HBox hbox, hbox_bottom;
     Gtk::VBox bottom_pad;
     Gtk::VBox popover_layout_box;
     Gtk::Image main_image;
     Gtk::Entry search_box;
     Gtk::FlowBox flowbox;
+    Gtk::Button logout_button;
     Gtk::ScrolledWindow scrolled_window;
     std::unique_ptr<WayfireMenuButton> button;
 
@@ -65,11 +66,13 @@ class WayfireMenu : public WayfireWidget
      * so that we don't show duplicate entries */
     std::set<std::pair<std::string, std::string>> loaded_apps;
 
+    WfOption<std::string> menu_logout_command{"panel/menu_logout_command"};
     WfOption<bool> fuzzy_search_enabled{"panel/menu_fuzzy_search"};
     WfOption<std::string> panel_position{"panel/position"};
-    WfOption<int> menu_size{"panel/launchers_size"};
     WfOption<std::string> menu_icon{"panel/menu_icon"};
+    WfOption<int> menu_size{"panel/launchers_size"};
     void update_popover_layout();
+    void on_logout_click();
 
     public:
     void init(Gtk::HBox *container) override;