// Title: Building ASP.NET Server Controls

//

// Chapter: 5 - Event-based Programming

// File: LifecycleControl.cs

// Written by: Dale Michalk and Rob Cameron

//

// Copyright ?2003, Apress L.P.

using System;

using System.Web.UI;

using System.Collections.Specialized;

using System.Diagnostics;

namespace ControlsBookLib.Ch05

{

   [ToolboxData("<{0}:Lifecycle runat=server></{0}:Lifecycle>")]

   public class Lifecycle : Control, IPostBackEventHandler, IPostBackDataHandler

   {

      // Init Event

      override protected void OnInit(System.EventArgs e)

      {         

         Trace("Lifecycle: Init Event.");

         base.OnInit(e);

      }

      override protected void TrackViewState()

      {         

         Trace("Lifecycle: Track ViewState.");

         base.TrackViewState();

      }

      // Load ViewState Event

      override protected void LoadViewState(object savedState)

      {         

         Trace("Lifecycle: Load ViewState Event.");

         base.LoadViewState(savedState);

      }

      // Load Postback Data Event

      public bool LoadPostData(string postDataKey,

         NameValueCollection postCollection)

      {

         Trace("Lifecycle: Load PostBack Data Event.");

         Page.RegisterRequiresRaiseEvent(this);

         return true;

      }

      // Load Event

      override protected void OnLoad(System.EventArgs e)

      {         

         Trace("Lifecycle: Load Event.");

         base.OnLoad(e);

      }

      // Post Data Changed Event

      public void RaisePostDataChangedEvent()

      {

         Trace("Lifecycle: Post Data Changed Event.");

      }

      // Postback Event

      public void RaisePostBackEvent(string argument)

      {

         Trace("Lifecycle: PostBack Event.");

      }

      // PreRender Event

      override protected void OnPreRender(System.EventArgs e)

      {         

         Trace("Lifecycle: PreRender Event.");

         Page.RegisterRequiresPostBack(this);

         base.OnPreRender(e);

      }

      // Save ViewState

      override protected object SaveViewState()

      {

         Trace("Lifecycle: Save ViewState.");

         return base.SaveViewState();

      }

      // Render Event

      override protected void Render(HtmlTextWriter writer)

      {   

         base.Render(writer);

         Trace("Lifecycle: Render Event.");

         writer.Write("<h3>LifeCycle Control</h3>");

         

      }

      // Unload Event

      override protected void OnUnload(System.EventArgs e)

      {         

         Trace("Lifecycle: Unload Event.");

         base.OnUnload(e);

      }

      // Dispose Event

      public override void Dispose()

      {         

         Trace("Lifecycle: Dispose Event.");

         base.Dispose();

      }

      private void Trace(string info)

      {

         Context.Trace.Warn(info);

         Debug.WriteLine(info);

      }

   }

}