theme_info.h

#pragma once
 
#include <cgv/media/color.h>
#include <cgv/signal/signal.h>
 
#include "lib_begin.h"
 
namespace cgv {
namespace gui {
 
#define DEF_COLOR_MEMBER_METHODS(FIELD) \
void FIELD(unsigned char r, unsigned char g, unsigned char b) { \
    FIELD##_col = rgb( \
        static_cast<float>(r) / 255.0f, \
        static_cast<float>(g) / 255.0f, \
        static_cast<float>(b) / 255.0f \
    ); \
} \
rgb FIELD() const { \
    return FIELD##_col; \
}\
std::string FIELD##_hex() const { \
    return rgb_to_hex(FIELD##_col); \
}
 
class CGV_API theme_info {
protected:
    int theme_idx;
 
    int spacing_ = 1;
 
    rgb background_col;
    rgb group_col;
    rgb control_col;
    rgb border_col;
    rgb text_col;
    rgb text_background_col;
    rgb selection_col;
    rgb highlight_col;
    rgb warning_col;
    rgb shadow_col;
 
    static std::string char_to_hex(unsigned char c) {
        static const char hex_chars[16] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };
        std::string s = "00";
        s[0] = hex_chars[(c & 0xF0) >> 4];
        s[1] = hex_chars[(c & 0x0F) >> 0];
        return s;
    }
 
    static std::string rgb_to_hex(const rgb& c) {
        unsigned char r = static_cast<unsigned char>(255.0f * c.R());
        unsigned char g = static_cast<unsigned char>(255.0f * c.G());
        unsigned char b = static_cast<unsigned char>(255.0f * c.B());
        std::string s = "0x" + char_to_hex(r) + char_to_hex(g) + char_to_hex(b);
        return s;
    }
 
public:
    static theme_info& instance();
 
    theme_info(const theme_info&) = delete;
    void operator=(const theme_info&) = delete;
 
    theme_info();
    ~theme_info() {}
 
    void set_index(int idx);
    int get_index() const;
    bool is_dark() const;
 
    int spacing() const { return spacing_; }
    void spacing(int i) { spacing_ = i; }
 
    DEF_COLOR_MEMBER_METHODS(background)
    DEF_COLOR_MEMBER_METHODS(group)
    DEF_COLOR_MEMBER_METHODS(control)
    DEF_COLOR_MEMBER_METHODS(border)
    DEF_COLOR_MEMBER_METHODS(text)
    DEF_COLOR_MEMBER_METHODS(text_background)
    DEF_COLOR_MEMBER_METHODS(selection)
    DEF_COLOR_MEMBER_METHODS(highlight)
    DEF_COLOR_MEMBER_METHODS(warning)
    DEF_COLOR_MEMBER_METHODS(shadow)
 
    cgv::signal::signal<const theme_info&> on_change;
};
 
#undef DEF_COLOR_MEMBER_METHODS
 
class CGV_API theme_observer : virtual public cgv::signal::tacker {
public:
    theme_observer() {
        cgv::gui::theme_info& theme = cgv::gui::theme_info::instance();
        cgv::signal::connect(theme.on_change, this, &theme_observer::handle_theme_change);
    }
 
    ~theme_observer() {
        cgv::gui::theme_info& theme = cgv::gui::theme_info::instance();
        cgv::signal::disconnect(theme.on_change, this, &theme_observer::handle_theme_change);
    }
 
    virtual void handle_theme_change(const cgv::gui::theme_info& theme) {}
};
 
}
}
 
#include <cgv/config/lib_end.h>