grid_widget.hpp

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// Copyright Take Vos 2021-2022.
// 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 "../layout/grid_layout.hpp"
#include <memory>
 
namespace hi { inline namespace v1 {
 
class grid_widget : public widget {
public:
    using super = widget;
 
    ~grid_widget();
 
    grid_widget(widget *parent) noexcept;
 
    template<typename Widget, typename... Args>
    Widget&
    make_widget(std::size_t first_column, std::size_t first_row, std::size_t last_column, std::size_t last_row, Args&&...args)
    {
        hi_axiom(first_column < last_column);
        hi_axiom(first_row < last_row);
        auto tmp = std::make_unique<Widget>(this, std::forward<Args>(args)...);
        return static_cast<Widget&>(add_widget(first_column, first_row, last_column, last_row, std::move(tmp)));
    }
 
    template<typename Widget, typename... Args>
    Widget& make_widget(std::size_t column, std::size_t row, Args&&...args)
    {
        return make_widget<Widget>(column, row, column + 1, row + 1, std::forward<Args>(args)...);
    }
 
    template<typename Widget, typename... Args>
    Widget& make_widget(std::string_view address, Args&&...args)
    {
        hilet[column_first, row_first, column_last, row_last] = parse_spreadsheet_range(address);
        return make_widget<Widget>(column_first, row_first, column_last, row_last, std::forward<Args>(args)...);
    }
 
    [[nodiscard]] generator<widget const &> children(bool include_invisible) const noexcept override
    {
        for (hilet& cell : _grid) {
            co_yield *cell.value;
        }
    }
 
    [[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:
    grid_layout<std::unique_ptr<widget>> _grid;
 
    /* Add a widget to the grid.
     */
    widget& add_widget(
        std::size_t first_column,
        std::size_t first_row,
        std::size_t last_column,
        std::size_t last_row,
        std::unique_ptr<widget> child_widget) noexcept;
};
 
}} // namespace hi::v1