input_text.hpp

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#pragma once
#include "le2d/drawable/drawable.hpp"
#include "le2d/event.hpp"
#include "le2d/text/line_input.hpp"
#include "le2d/text/text_geometry.hpp"
#include <kvf/time.hpp>
 
namespace le {
struct InputTextParams {
    TextHeight height{TextHeight::Default};
    char cursor_symbol{'|'};
    kvf::Color cursor_color{kvf::white_v};
    kvf::Seconds blink_period{1s};
};
 
namespace drawable {
class InputText : public RenderInstance, public IDrawable {
  public:
    using Params = InputTextParams;
 
    explicit InputText(gsl::not_null<IFont*> font, Params const& params = {});
 
    [[nodiscard]] auto get_size() const -> glm::vec2 { return m_size; }
    [[nodiscard]] auto get_font() const -> IFont& { return *m_font; }
    [[nodiscard]] auto get_atlas() const -> IFontAtlas& { return m_line_input.get_atlas(); }
 
    [[nodiscard]] auto is_interactive() const -> bool { return m_interactive; }
    void set_interactive(bool interactive);
 
    [[nodiscard]] auto get_string() const -> std::string_view { return m_line_input.get_string(); }
    void set_string(std::string line);
    void append(std::string_view str);
    void write(char ch);
    void backspace();
    void delete_front();
    void clear();
 
    [[nodiscard]] auto get_cursor() const -> int { return m_line_input.get_cursor(); }
    void set_cursor(int cursor);
    void move_cursor(int const delta) { set_cursor(get_cursor() + delta); }
    void cursor_left() { move_cursor(-1); }
    void cursor_right() { move_cursor(+1); }
    void cursor_home() { set_cursor(0); }
    void cursor_end() { set_cursor(int(get_string().size())); }
 
    void on_key(event::Key const& key);
    void on_codepoint(event::Codepoint codepoint);
 
    void tick(kvf::Seconds dt);
    void draw(IRenderer& renderer) const override;
 
  private:
    void update();
    void reset_blink();
 
    gsl::not_null<IFont*> m_font;
 
    LineInput m_line_input;
    TextGeometry m_cursor{};
    kvf::Color m_cursor_color;
    kvf::Seconds m_blink_period;
 
    float m_cursor_offset_x{};
 
    glm::vec2 m_size{};
 
    kvf::Seconds m_elapsed{};
    float m_cursor_alpha{1.0f};
    bool m_interactive{true};
};
} // namespace drawable
} // namespace le