overlay_widget.hpp

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// Copyright Take Vos 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"
 
namespace hi { inline namespace v1 {
 
class overlay_widget final : public widget {
public:
    using super = widget;
 
    ~overlay_widget();
 
    overlay_widget(widget *parent) noexcept;
 
    void set_widget(std::unique_ptr<widget> new_widget) noexcept;
 
    template<typename Widget, typename... Args>
    Widget& make_widget(Args&&...args) noexcept
    {
        hi_axiom(loop::main().on_thread());
        hi_assert(_content == nullptr);
 
        auto tmp = std::make_unique<Widget>(this, std::forward<Args>(args)...);
        auto& ref = *tmp;
        set_widget(std::move(tmp));
        return ref;
    }
 
    [[nodiscard]] generator<widget const &> children(bool include_invisible) const noexcept override
    {
        co_yield *_content;
    }
 
    [[nodiscard]] box_constraints update_constraints() noexcept override;
    void set_layout(widget_layout const& context) 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::aarectanglei rectangle) noexcept override;
    [[nodiscard]] hitbox hitbox_test(point2i position) const noexcept override;
private:
    std::unique_ptr<widget> _content;
    box_constraints _content_constraints;
    box_shape _content_shape;
 
    void draw_background(draw_context const& context) noexcept;
};
 
}} // namespace hi::v1