Opinionated class based component approach

[mediocre9]

Class based component pattern to build the app.

Proposed Design Architectural Style

class RootComponent : public IApplicationController {
public:
    // construct window application from here .  .  .
    RootComponent() : 
    IApplicationController("My First App", Dimension(500, 500), eng::Color.AQUA_BLACK), 
    v_menu_(nullptr), frame_(nullptr) {
        v_menu_ = new VerticalMenu();
        frame_ = new Frame();
    }
    
    // setup gui object values .  .  . 
    void setup() override {
        // for menu
        items_ = {
            {" New   ", HIGHLIGHT},
            {" File  ", DEFAULT},
            {" Edit  ", DEFAULT},
            {" View  ", DEFAULT},
        };

        v_menu_->addItems(items_);
        v_menu_->setTheme({DEFAULT, HIGHLIGHT});
        v_menu_->setPosition({0, 0});

        // for window frame
        frame_->setDimension({10, 25});
        frame_->setPosition({1, 3});
        frame_->enableShadow(true);
        frame_->setBorderType(AbstractWindow::Border::PIPE);
    }

    // update callback method . . .
    void controller() override {
        while (!v_menu_->isItemSelected()) {
            v_menu_->render();
        }

        v_menu_->restart();

        switch (v_menu_->getItemPosition()) {
        case 1:
            frame_->render();
            break;
        }
    }

    ~RootComponent() {
        delete v_menu_;
        delete frame_;
    }

private:
    std::vector<MenuItem> items_;
    Window* frame_;
    MenuBar* v_menu_;
};

int main() {
    RootComponent root;
    root.init(std::bind(&RootComponent::controller, &root));
    return 0;
}