Declarative Programming--Unifying Form And Web Development

// Copyright (c) 2004 Marc Clifton.  All Rights Reserved

using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Diagnostics;
using System.Drawing;
using System.IO;
using System.Text;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Xml;
using System.Xml.Xsl;

using MyXaml;

namespace declarativeWeb
{
	/// <summary>
	/// Summary description for WebForm1.
	/// </summary>
	public class WebForm1 : System.Web.UI.Page
	{
		protected System.Web.UI.WebControls.Panel formPanel;

		private void Page_Load(object sender, System.EventArgs e)
		{
			if (!IsPostBack)
			{
				SimpleCalc sc=new SimpleCalc();
				XmlDocument doc=LoadDocument();

				if (doc != null)
				{
					Parser parser=new Parser();
					Panel panel=(Panel)parser.LoadObject(doc, "Calc", sc, null);
					if (panel != null)
					{
						formPanel.Controls.Add(panel);
					}
				}

				Session["SimpleCalc"]=sc;
			}
			else
			{
				SimpleCalc sc=(SimpleCalc)Session["SimpleCalc"];
				XmlDocument doc=LoadDocument();

				if (doc != null)
				{
					Parser parser=new Parser();
					Panel panel=(Panel)parser.LoadObject(doc, "Calc", sc, null);
					if (panel != null)
					{
						formPanel.Controls.Add(panel);
					}
				}
			}
		}

		#region Web Form Designer generated code
		override protected void OnInit(EventArgs e)
		{
			InitializeComponent();
			base.OnInit(e);
		}
		
		/// <summary>
		/// Required method for Designer support - do not modify
		/// the contents of this method with the code editor.
		/// </summary>
		private void InitializeComponent()
		{    
			this.Load += new System.EventHandler(this.Page_Load);

		}
		#endregion

		private XmlDocument LoadDocument()
		{
			XmlDocument doc=null;
			string path=MapPath("");
			
			try
			{
				doc=new XmlDataDocument();
				doc.PreserveWhitespace=true;
				doc.Load(path+"\\calcForm.xml");
				XslTransform xt=new XslTransform();
				xt.Load(path+"\\form2web.xslt");
				StringBuilder sb=new StringBuilder();
				StringWriter sw=new StringWriter(sb);
				xt.Transform(doc, null, new XmlTextWriter(sw), new XmlUrlResolver());

				doc=new XmlDocument();
				doc.LoadXml(sb.ToString());
				System.Diagnostics.Trace.WriteLine(sb.ToString());

			}
			catch(Exception ex)
			{
				Trace.Warn(ex.Message);
			}
			return doc;
		}
	}
}