overlay_widget.hpp

// Copyright Take Vos 2020-2021.
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at https://www.boost.org/LICENSE_1_0.txt)
 
#pragma once
 
#include "widget.hpp"
#include "overlay_delegate.hpp"
 
namespace hi::inline v1 {
 
class overlay_widget final : public widget {
public:
    using super = widget;
    using delegate_type = overlay_delegate;
 
    ~overlay_widget();
 
    overlay_widget(gui_window &window, widget *parent, std::weak_ptr<delegate_type> delegate = {}) noexcept;
 
    void set_widget(std::unique_ptr<widget> new_widget) noexcept;
 
    template<typename Widget, typename... Args>
    Widget &make_widget(Args &&...args) noexcept
    {
        hi_axiom(is_gui_thread());
        hi_axiom(not _content);
 
        auto tmp = std::make_unique<Widget>(window, this, std::forward<Args>(args)...);
        auto &ref = *tmp;
        set_widget(std::move(tmp));
        return ref;
    }
 
    [[nodiscard]] generator<widget *> children() const noexcept override
    {
        co_yield _content.get();
    }
 
    widget_constraints const &set_constraints() noexcept override;
    void set_layout(widget_layout const &layout) noexcept override;
    void draw(draw_context const &context) noexcept override;
    [[nodiscard]] color background_color() const noexcept override;
    [[nodiscard]] color foreground_color() const noexcept override;
    void scroll_to_show(hi::aarectangle rectangle) noexcept override;
    [[nodiscard]] hitbox hitbox_test(point3 position) const noexcept override;
private:
    std::weak_ptr<delegate_type> _delegate;
    std::unique_ptr<widget> _content;
 
    void draw_background(draw_context const &context) noexcept;
};
 
} // namespace hi::inline v1