use separated mod for context menu model

src/app/browser/window/tab/menu.rs

@@ -0,0 +1,81 @@
+use gtk::{gio::SimpleAction, prelude::ActionExt};
+
+/// Context menu wrapper
+///
+/// https://gnome.pages.gitlab.gnome.org/libadwaita/doc/main/method.TabView.get_menu_model.html
+pub struct Menu {
+    gobject: gtk::gio::Menu,
+}
+
+impl Menu {
+    // Constructors
+
+    /// Create new `Self`
+    pub fn new(
+        action_page_close_all: SimpleAction,
+        action_page_close: SimpleAction,
+        action_page_history_back: SimpleAction,
+        action_page_history_forward: SimpleAction,
+        action_page_home: SimpleAction,
+        action_page_pin: SimpleAction,
+        action_page_reload: SimpleAction,
+    ) -> Self {
+        let main = gtk::gio::Menu::new();
+
+        main.append(
+            Some("Reload"),
+            Some(&detailed_action_name(action_page_reload)),
+        );
+
+        main.append(Some("Pin"), Some(&detailed_action_name(action_page_pin)));
+
+        let navigation = gtk::gio::Menu::new();
+
+        navigation.append(Some("Home"), Some(&detailed_action_name(action_page_home)));
+
+        main.append_section(None, &navigation);
+
+        let history = gtk::gio::Menu::new();
+
+        history.append(
+            Some("Back"),
+            Some(&detailed_action_name(action_page_history_back)),
+        );
+
+        history.append(
+            Some("Forward"),
+            Some(&detailed_action_name(action_page_history_forward)),
+        );
+
+        main.append_submenu(Some("History"), &history);
+
+        let close = gtk::gio::Menu::new();
+
+        close.append(
+            Some("Current"),
+            Some(&detailed_action_name(action_page_close)),
+        );
+
+        close.append(
+            Some("All"),
+            Some(&detailed_action_name(action_page_close_all)),
+        );
+
+        main.append_submenu(Some("Close"), &close);
+
+        Self { gobject: main }
+    }
+
+    /// Get reference to [Menu](https://docs.gtk.org/gio/class.Menu.html) `GObject`
+    pub fn gobject(&self) -> &gtk::gio::Menu {
+        &self.gobject
+    }
+}
+
+// Private helpers
+
+fn detailed_action_name(action: SimpleAction) -> String {
+    format!("win.{}", action.name()) // @TODO find the way to ident parent group
+                                     // without application-wide dependencies import
+                                     // see also src/app/action.rs
+}