widget_primitives.h

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#pragma once
 
#include "canvas.h"
#include <cstdlib>
#include <cstring>

#define SSD1306_ASCII_FULL
#include "font/5x8_font.h"
#include "font/8x8_font.h"
#include "font/12x16_font.h"
#include "font/16x32_font.h"
#include <cstdint>

#define BACKSPACE '\b'
#define HORIZONTAL_TAB '\t'
#define LINE_FEED '\n'
#define VERTICAL_TAB '\v'
#define FORM_FEED '\f'
#define CARRIAGE_RETURN '\r'

class GraphicDrawer
{
protected:
    size_t widget_width{128};

    size_t widget_height{8};

    uint8_t widget_start_x;

    uint8_t widget_start_y;
 
public:
    bool widget_with_border{false};
    
    GraphicDrawer(struct_ConfigGraphicWidget graph_cfg,
                  CanvasFormat canvas_format);

    GraphicDrawer(struct_ConfigTextWidget text_cfg,
                  CanvasFormat canvas_format);

    GraphicDrawer(struct_ConfigTextWidget text_cfg,
                  CanvasFormat canvas_format, size_t frame_width,
                  size_t frame_height);
    virtual ~GraphicDrawer();

    uint8_t widget_border_width;
    void clear_widget();
    Canvas *canvas;

    void hline(uint8_t x, uint8_t y, size_t w, ColorIndex color = ColorIndex::WHITE);

    void vline(uint8_t x, uint8_t y, size_t h, ColorIndex color = ColorIndex::WHITE);

    void line(int x0, int y0, int x1, int y1, ColorIndex color = ColorIndex::WHITE);

    void rect(uint8_t start_x, uint8_t start_y, size_t w, size_t h, bool fill = false, ColorIndex color = ColorIndex::WHITE);
    void circle(int radius, int x_center, int y_center, bool fill = false, ColorIndex color = ColorIndex::WHITE);

    virtual void draw_border(ColorIndex color = ColorIndex::WHITE);
};

class TextWriter : public GraphicDrawer
{
private:
    uint8_t current_char_line{0};

    uint8_t current_char_column{0};

    void write(char character, uint8_t char_column, uint8_t char_line);

    void clear_line();

    const unsigned char *font{nullptr};

    uint8_t tab_size{2};

    bool wrap{true};

    // TODO consider case where \n is conflicting with auto_next_char when the string is right the same cahr number than the widget
    bool auto_next_char{true};

    void draw_glyph(const char character,
                    const uint8_t anchor_x, const uint8_t anchor_y);
 
protected:
    void create_text_buffer();
 
public:
    TextWriter(struct_ConfigTextWidget text_cfg,
               CanvasFormat canvas_format);

    TextWriter(struct_ConfigTextWidget text_cfg,
               CanvasFormat canvas_format,
               size_t frame_width,
               size_t frame_height);
    ~TextWriter();

    uint8_t number_of_column{0};
    uint8_t number_of_line{0};

    size_t text_buffer_size;
    char *text_buffer = nullptr;

    void update_text_line_column_number(const unsigned char *font);

    void clear_text_buffer();

    void update_canvas_buffer_size(const unsigned char *font);

    void write();

    void write(const char *c_str);

    void process_char(char character);

    void next_line();

    void next_char();

    void draw_border(ColorIndex color = ColorIndex::WHITE);
};