bwidgets/inc/basic_widgets/w/base/layout.hpp

#ifndef BWIDGETS_LAYOUT_HPP
#define BWIDGETS_LAYOUT_HPP

#include <functional>
#include <vector>

#include <basic_widgets/core/type/size.hpp>
#include <basic_widgets/w/base/widget.hpp>

namespace bwidgets
{
    class Renderer;
}

namespace bwidgets
{
    class Layout : public Widget
    {
    protected:
        std::vector<std::shared_ptr<Widget>> _widgets;

        void _handle_geometry_change(const SDL_Rect&) override;
        void _handle_renderer_change(const std::shared_ptr<Renderer>&) override;
        void _handle_rendering() override;

        virtual void _update_layout(const SDL_Rect&) = 0;

    public:
        static const Size default_margins;

        Size margins = default_margins;

        Layout(Widget* p = nullptr) : Widget(p) {}

        auto               handle_event(const SDL_Event&) -> Layout* override;
        [[nodiscard]] auto size() const noexcept -> Size override = 0;

        virtual auto add_widget(const std::shared_ptr<Widget>&) -> Layout*;
        virtual void for_widgets(const std::function<void(Widget*)>&);
    };
}

#endif