label_widget.hpp

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// Copyright Take Vos 2020-2022.
// 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 "text_widget.hpp"
#include "icon_widget.hpp"
#include "../geometry/module.hpp"
#include "../layout/grid_layout.hpp"
#include "../label.hpp"
#include <memory>
#include <string>
#include <array>
#include <optional>
#include <future>
 
namespace hi { inline namespace v1 {
 
template<typename Context>
concept label_widget_attribute =
    forward_of<Context, observer<hi::label>, observer<hi::alignment>, observer<hi::semantic_text_style>>;
 
class label_widget final : public widget {
public:
    using super = widget;
 
    observer<label> label;
 
    observer<alignment> alignment = hi::alignment::top_flush();
 
    observer<semantic_text_style> text_style = semantic_text_style::label;
 
    label_widget(widget *parent, label_widget_attribute auto&&...attributes) noexcept : label_widget(parent)
    {
        set_attributes(hi_forward(attributes)...);
    }
 
    [[nodiscard]] generator<widget const &> children(bool include_invisible) const noexcept override
    {
        co_yield *_icon_widget;
        co_yield *_text_widget;
    }
 
    [[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]] hitbox hitbox_test(point2i position) const noexcept override;
private:
    float _icon_size;
    float _inner_margin;
 
    decltype(label)::callback_token _label_cbt;
    decltype(text_style)::callback_token _text_style_cbt;
    decltype(alignment)::callback_token _alignment_cbt;
 
    std::unique_ptr<icon_widget> _icon_widget;
    std::unique_ptr<text_widget> _text_widget;
    grid_layout<widget *> _grid;
 
    void set_attributes() noexcept {}
    void set_attributes(label_widget_attribute auto&& first, label_widget_attribute auto&&...rest) noexcept
    {
        if constexpr (forward_of<decltype(first), observer<hi::label>>) {
            label = hi_forward(first);
        } else if constexpr (forward_of<decltype(first), observer<hi::alignment>>) {
            alignment = hi_forward(first);
        } else if constexpr (forward_of<decltype(first), observer<hi::semantic_text_style>>) {
            text_style = hi_forward(first);
        } else {
            hi_static_no_default();
        }
 
        set_attributes(hi_forward(rest)...);
    }
 
    label_widget(widget *parent) noexcept;
};
 
}} // namespace hi::v1