multi_cell_info.h

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#pragma once
 
#include "di/reflect/prelude.h"
#include "di/types/prelude.h"
 
namespace ttx::terminal {
struct MultiCellInfo {
    u8 scale { 1 }; 
    u8 width { 0 }; 
    u8 fractional_scale_numerator { 0 };   
    u8 fractional_scale_denominator { 0 }; 
    u8 vertical_alignment { 0 };           
    u8 horizontal_alignment { 0 };         
 
    constexpr auto compute_width() const -> u8 { return scale * width; }
 
    auto operator==(MultiCellInfo const&) const -> bool = default;
    auto operator<=>(MultiCellInfo const&) const = default;
 
    constexpr friend auto tag_invoke(di::Tag<di::reflect>, di::InPlaceType<MultiCellInfo>) {
        return di::make_fields<"Hyperlink">(
            di::field<"scale", &MultiCellInfo::scale>, di::field<"width", &MultiCellInfo::width>,
            di::field<"fractional_scale_numerator", &MultiCellInfo::fractional_scale_numerator>,
            di::field<"fractional_scale_denominator", &MultiCellInfo::fractional_scale_denominator>,
            di::field<"vertical_alignment", &MultiCellInfo::vertical_alignment>,
            di::field<"horizontal_alignment", &MultiCellInfo::horizontal_alignment>);
    }
};
 
// Strictly speaking, this isn't a multicell. However, its a reasonable default value.
constexpr inline auto narrow_multi_cell_info = MultiCellInfo { 1, 1 };
 
constexpr inline auto wide_multi_cell_info = MultiCellInfo { 1, 2 };
}