text_view.hpp

#ifndef TERMOX_WIDGET_WIDGETS_TEXT_DISPLAY_HPP
#define TERMOX_WIDGET_WIDGETS_TEXT_DISPLAY_HPP
#include <memory>
#include <vector>
 
#include <signals_light/signal.hpp>
 
#include <termox/painter/brush.hpp>
#include <termox/painter/glyph_string.hpp>
#include <termox/painter/painter.hpp>
#include <termox/widget/align.hpp>
#include <termox/widget/point.hpp>
#include <termox/widget/widget.hpp>
#include <termox/widget/wrap.hpp>
 
namespace ox {
 
 
class Text_view : public Widget {
   public:
    struct Parameters {
        Glyph_string text  = U"";
        Align alignment    = Align::Left;
        Wrap wrap          = Wrap::Word;
        Brush insert_brush = Brush{};
    };
 
   public:
 
    Brush insert_brush;
 
    sl::Signal<void(int n)> scrolled_up;
 
    sl::Signal<void(int n)> scrolled_down;
 
    sl::Signal<void(int n)> scrolled_to;
 
    sl::Signal<void(Glyph_string const&)> contents_modified;
 
    sl::Signal<void(int)> line_count_changed;
 
   public:
 
    explicit Text_view(Glyph_string text  = U"",
                       Align alignment    = Align::Left,
                       Wrap wrap          = Wrap::Word,
                       Brush insert_brush = Brush{});
 
    explicit Text_view(Parameters p);
 
   public:
 
    void set_text(Glyph_string text);
 
 
    [[nodiscard]] auto text() -> Glyph_string&;
 
    [[nodiscard]] auto text() const -> Glyph_string const&;
 
 
    void set_alignment(Align type);
 
    [[nodiscard]] auto alignment() const -> Align;
 
    void set_wrap(Wrap w);
 
    [[nodiscard]] auto wrap() const -> Wrap;
 
   public:
 
    void insert(Glyph_string text, int index);
 
 
    void append(Glyph_string text);
 
    void erase(int index, int length = Glyph_string::npos);
 
    void pop_back();
 
 
    void clear();
 
 
    virtual void scroll_up(int n = 1);
 
 
    virtual void scroll_down(int n = 1);
 
 
    [[nodiscard]] auto row_length(int y) const -> int;
 
    [[nodiscard]] auto display_height() const -> int;
 
    [[nodiscard]] auto line_count() const -> int;
 
    void set_top_line(int n);
 
 
    [[nodiscard]] auto index_at(Point position) const -> int;
 
 
    [[nodiscard]] auto display_position(int index) const -> Point;
 
    void update() override;
 
   protected:
    auto paint_event(Painter& p) -> bool override;
 
    [[nodiscard]] auto line_at(int index) const -> int;
 
    [[nodiscard]] auto top_line() const -> int;
 
    [[nodiscard]] auto bottom_line() const -> int;
 
    [[nodiscard]] auto last_line() const -> int;
 
    [[nodiscard]] auto first_index_at(int line) const -> int;
 
    [[nodiscard]] auto last_index_at(int line) const -> int;
 
    [[nodiscard]] auto line_length(int line) const -> int;
 
    [[nodiscard]] auto end_index() const -> int;
 
 
    void update_display(int from_line = 0);
 
   private:
    struct Line_info {
        int start_index;
        int length;
    };
 
   private:
    Glyph_string contents_;
    Align alignment_;
    Wrap wrap_;
 
    int top_line_                         = 0;  // Index into display_state_.
    std::vector<Line_info> display_state_ = {Line_info{0, 0}};
};
 
[[nodiscard]] auto text_view(Glyph_string text = U"",
                             Align alignment   = Align::Left,
                             Wrap wrap         = Wrap::Word)
    -> std::unique_ptr<Text_view>;
 
[[nodiscard]] auto text_view(Text_view::Parameters p)
    -> std::unique_ptr<Text_view>;
 
}  // namespace ox
#endif  // TERMOX_WIDGET_WIDGETS_TEXT_DISPLAY_HPP