billy-gtk4-interface/app_win_2_back.cpp

#include "app_win_2_back.hpp"
#include "hello_world.hpp"
#include <iostream>
#include <glibmm/miscutils.h>

namespace gui_to_app {
    AppWin2Back::AppWin2Back() : Gtk::Application("org.billy_adventures.character_sheet", Flags::HANDLES_OPEN) {
        Glib::set_application_name("Billy's character sheet");
    }

    void AppWin2Back::on_startup() {
        Application::on_startup();
        const auto menu_bar = []() -> Glib::RefPtr<Gio::Menu> {
            try {
                const auto builder = Gtk::Builder::create_from_file("menu_bar.ui");
                return builder->get_object<Gio::Menu>("menu");
            } catch (const std::exception &e) {
                std::cerr << e.what() << '\n';
                return nullptr;
            }
        }();
        if (!menu_bar) {
            std::cerr << "Error occured while loading menu bar's.\n";
        } else {
            set_menubar(menu_bar);
            add_action("quit", sigc::mem_fun(*this, &AppWin2Back::on_quit));
            set_accel_for_action("app.quit", "<Ctrl>q");
        }
    }

    Glib::RefPtr<AppWin2Back> AppWin2Back::create() {
        return Glib::make_refptr_for_instance(new AppWin2Back());
    }

    void AppWin2Back::on_activate() {
        Application::on_activate();

        const auto app_builder = [this]() -> Glib::RefPtr<Gtk::Builder> {
            try {
                return Gtk::Builder::create_from_file("window_ui.ui");
            } catch (const std::exception &e) {
                std::cerr << e.what() << std::endl;
                quit();
                return nullptr;
            }
        }();
        if (!app_builder) {
            std::cerr << "Error while loading UI.\n";
            quit();
            return;
        }
        main_window = Gtk::Builder::get_widget_derived<learn_gtkmm4::HelloWorld>(app_builder, "main_window");
        if (main_window != nullptr) {
            add_window(*main_window);
            main_window->set_show_menubar(true);
            main_window->set_visible(true);
        } else {
            on_quit();
        }
    }

    void AppWin2Back::on_quit() {
        auto windows = get_windows();
        for (auto *window: windows) {
            window->set_visible(false);
            delete window;
        }
        quit();
    }

} // gui_to_app