use separated class files, use hpp header extension, update include model

src/app/browser/header/menu.cpp

@@ -0,0 +1,48 @@
+#include "menu.hpp"
+
+using namespace app::browser::header;
+
+Menu::Menu()
+{
+    set_tooltip_text(
+        TOOLTIP
+    );
+
+    // Build tab submenu
+    auto tab = Gio::Menu::create();
+
+    tab->append(
+        _("New tab"),
+        "app.tab.new"
+    );
+
+    // Build tool submenu
+    auto tool = Gio::Menu::create();
+
+    tool->append(
+        _("Debug"),
+        "app.tool.debug"
+    );
+
+    // Build main menu
+    auto main = Gio::Menu::create();
+
+    main->append_submenu(
+        _("Tab"),
+        tab
+    );
+
+    main->append_submenu(
+        _("Tool"),
+        tool
+    );
+
+    main->append(
+        _("Quit"),
+        "win.quit"
+    );
+
+    set_menu_model(
+        main
+    );
+}

src/app/browser/header/menu.hpp

@@ -0,0 +1,21 @@
+#ifndef APP_BROWSER_HEADER_MENU_H
+#define APP_BROWSER_HEADER_MENU_H
+
+#include <giomm/menu.h>
+
+#include <glibmm/i18n.h>
+#include <gtkmm/menubutton.h>
+
+namespace app::browser::header
+{
+    class Menu : public Gtk::MenuButton
+    {
+        public:
+
+            const char* TOOLTIP = _("Menu");
+
+            Menu();
+    };
+}
+
+#endif // APP_BROWSER_HEADER_MENU_H

src/app/browser/header/tab.cpp

@@ -0,0 +1,14 @@
+#include "tab.hpp"
+
+using namespace app::browser::header;
+
+Tab::Tab()
+{
+    set_tooltip_text(
+        TOOLTIP
+    );
+
+    set_icon_name(
+        ICON
+    );
+}

src/app/browser/header/tab.hpp

@@ -0,0 +1,20 @@
+#ifndef APP_BROWSER_HEADER_TAB_H
+#define APP_BROWSER_HEADER_TAB_H
+
+#include <glibmm/i18n.h>
+#include <gtkmm/menubutton.h>
+
+namespace app::browser::header
+{
+    class Tab : public Gtk::MenuButton
+    {
+        public:
+
+            const char* ICON = "tab-new-symbolic";
+            const char* TOOLTIP = _("New tab");
+
+            Tab();
+    };
+}
+
+#endif // APP_BROWSER_HEADER_TAB_H