Maigre is a managed GTK theme engine. It allows easily writing GTK themes
in managed code. Maigre takes care of implementing the GtkRcStyle, GtkStyle,
and theme module entry points, leaving the theme author to only have to worry
about rendering code.

Rendering functions (draw_*) that typically are overridden in GtkStyle are
simply defined in a well-named static class (Maigre.Theme). All methods are
optional. In addition to Draw functions, this class may optionally implement
ModuleInit and ModuleExit functions.

An example:

using System;
using Gtk;
using Cairo;

namespace Maigre
{
    public static class Theme
    {
        public static void ModuleInit ()
        {
        }

        public static void ModuleExit ()
        {
        }

        public static void DrawBox (Gtk.Style style, Gdk.Window window,
            StateType state_type, ShadowType shadow_type, Gdk.Rectangle area,
            Widget widget, string detail, int x, int y, int width, int height)
        {
            var cr = Gdk.CairoHelper.Create (widget.GdkWindow);
            switch (detail) {
                case "hscrollbar":
                case "vscrollbar": cr.Color = new Cairo.Color (1, 0, 0); break;
                case "slider":" cr.Color = new Cairo.Color (0, 0, 1); break;
                case "trough": cr.Color = new Cairo.Color (0, 1, 0); break;
                default: cr.Color = new Cairo.Color (1, 0, 1); break;
            }
            cr.Rectangle (x, y, width, height);
            cr.Fill ();
            ((IDisposable)cr).Dispose ();
        }
    }
}