line_input.hpp

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#pragma once
#include "le2d/primitive.hpp"
#include "le2d/resource/font.hpp"
#include "le2d/text/text_geometry.hpp"
#include <gsl/pointers>
 
namespace le {
class LineInput {
  public:
    explicit LineInput(gsl::not_null<IFont*> font, TextHeight height = TextHeight::Default);
 
    [[nodiscard]] auto get_string() const -> std::string_view { return m_line; }
    [[nodiscard]] auto get_height() const -> TextHeight { return m_atlas->get_height(); }
    [[nodiscard]] auto get_cursor() const -> int { return m_cursor; }
    [[nodiscard]] auto get_cursor_x() const -> float { return m_cursor_x; }
    [[nodiscard]] auto get_size() const -> glm::vec2 { return m_size; }
    [[nodiscard]] auto get_glyph_layouts() const -> std::span<kvf::ttf::GlyphLayout const> { return m_glyph_layouts; }
 
    [[nodiscard]] auto get_atlas() const -> IFontAtlas& { return *m_atlas; }
    [[nodiscard]] auto get_texture() const -> ITexture const& { return get_atlas().get_texture(); }
 
    [[nodiscard]] auto to_primitive() const -> Primitive;
 
    void set_string(std::string line);
    void append(std::string_view str);
 
    void write(char ch);
    void backspace();
    void delete_front();
 
    void set_cursor(int cursor);
    void move_cursor(int delta);
 
  protected:
    void update();
 
  private:
    void update_cursor_x();
 
    gsl::not_null<IFontAtlas*> m_atlas;
 
    std::vector<kvf::ttf::GlyphLayout> m_glyph_layouts{};
    TextGeometry m_geometry{};
 
    std::string m_line{};
    glm::vec2 m_size{};
    int m_cursor{};
    float m_cursor_x{};
    float m_next_glyph_x{};
};
} // namespace le