GuiTheme.h

/****************************************************************************
 * libgui
 * Daryl Borth 2026
 * GuiTheme.h
 *
 * One place for the colors and metrics a code-drawn UI shares, and ready
 * made styles built from them (card, panel, button, chip). Platform-agnostic.
 * Metrics are design-canvas pixels.
 *
 * The core defines no look of its own: every value comes from the
 * application's GuiThemeInit() (see below).
 ***************************************************************************/
#pragma once
#include "GuiPaint.h"

struct GuiTheme {
    // colors
    PixelColor background;      
    PixelColor surface;            
    PixelColor surfaceRaised;    
    PixelColor outline;            
    PixelColor outlineStrong;    
    PixelColor accent;          
    PixelColor accentLight;        
    PixelColor accentDark;      
    PixelColor text;          
    PixelColor textMuted;        
    PixelColor textOnAccent;  
    PixelColor textInverse;        
    PixelColor good;          
    PixelColor highlight;        
    PixelColor mark;          
    PixelColor shadow;          
 
    // metrics
    float radius;             
    float strokeWidth;           
    float padding;               
    float spacing;               
    float shadowBlur;         
 
    // glyphs (GuiGlyph)
    float glyphSize;           
    float glyphBumperWidth;     
    float glyphBumperHeight;   
    int glyphFontSize;         
    int glyphFontSizeSmall;       
 
    // style recipe tuning: the numbers the recipes below use with the colors above
    float shadowOffsetY;       
    float glowGrow;             
    uint8_t focusGlowAlpha;       
    uint8_t pressGlowAlpha;       
    float buttonGlowBlur;     
    uint8_t buttonGlowAlpha; 
    uint8_t rowPressAlpha;     
    uint8_t cardDisabledAlpha; 
    uint8_t buttonDisabledAlpha;
    float buttonStrokeLight;   
    float barDarken;           

    GuiTheme();

    static GuiTheme& current();

    GuiShapeStyle panelStyle() const;
    GuiShapeStyle cardStyle() const;
    GuiShapeStyle buttonStyle() const;
    GuiShapeStyle chipStyle() const;
    GuiShapeStyle rowStyle() const;
    GuiShapeStyle barStyle() const;
};

void GuiThemeInit(GuiTheme& theme);