Mini Kabibi Habibi

using System;
using System.IO;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;
using System.Windows.Resources;
using DevExpress.Xpf.DemoBase.Helpers;
using DevExpress.Xpf.DemoBase.Helpers.Internal;

namespace DevExpress.Xpf.LayoutControlDemo {
    public class CodeViewer : CodeViewPresenter {
        #region Dependency Properties

        public static readonly DependencyProperty CurrentItemProperty =
            DependencyProperty.Register("CurrentItem", typeof(object), typeof(CodeViewer),
                new PropertyMetadata(new PropertyChangedCallback(OnCurrentItemChanged)));

        private static void OnCurrentItemChanged(DependencyObject o, DependencyPropertyChangedEventArgs e) {
            ((CodeViewer)o).OnCurrentItemChanged();
        }

        #endregion Dependency Properties

        private Type _CurrentItemType;

        public CodeViewer() {
            FontFamily = new FontFamily("Consolas");
            FontSize = 13;
        }

        public object CurrentItem {
            get { return (object)GetValue(CurrentItemProperty); }
            set { SetValue(CurrentItemProperty, value); }
        }
        public Type CurrentItemType {
            get { return _CurrentItemType; }
            private set {
                if(CurrentItemType == value)
                    return;
                _CurrentItemType = value;
                OnCurrentItemTypeChanged();
            }
        }

        string LoadSourceCode(Type type) {
            string resourcePath =
                string.Format("/{0};component/Data/{1}{2}",
                    type.Assembly.FullName.Split(',')[0],
                    type.Name,
                    DemoHelper.GetCodeSuffix(type.Assembly));
            StreamResourceInfo resource = Application.GetResourceStream(new Uri(resourcePath, UriKind.Relative));
            return resource != null ? new StreamReader(resource.Stream).ReadToEnd() : null;
        }
        void OnCurrentItemChanged() {
            CurrentItemType = CurrentItem != null ? CurrentItem.GetType() : null;
        }
        void OnCurrentItemTypeChanged() {
            if(CurrentItemType != null)
                CodeText = new CodeLanguageText(DemoHelper.GetDemoLanguage(CurrentItemType.Assembly), LoadSourceCode(CurrentItemType));
            else
                CodeText = null;
        }
    }
}