ASP.NET Adapter Control

// -- FILE ------------------------------------------------------------------
// name       : AdapterControl.cs
// project    : Itenso Script Panel
// created    : Jani Giannoudis - 2012.03.29
// language   : c#
// environment: .NET 4.0
// copyright  : (c) 2012 by Itenso GmbH, Switzerland
// --------------------------------------------------------------------------
using System;
using System.Diagnostics;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace Itenso.Community.AdapterControl.Controls
{

	// ------------------------------------------------------------------------
	public class AdapterControl : Control
	{

		// ----------------------------------------------------------------------
		public enum AdaptMode
		{
			None,
			Unvaried,
			Inverted,
		} // enum AdaptMode

		// ----------------------------------------------------------------------
		[Themeable( false )]
		public string SourceControl { get; set; }

		// ----------------------------------------------------------------------
		[Themeable( false )]
		public string TargetControl { get; set; }

		// ----------------------------------------------------------------------
		[Themeable( false )]
		public AdaptMode EnabledMode { get; set; }

		// ----------------------------------------------------------------------
		[Themeable( false )]
		public AdaptMode VisibleMode { get; set; }

		// ----------------------------------------------------------------------
		protected override void OnPreRender( EventArgs e )
		{
			base.OnPreRender( e );

			// source
			if ( string.IsNullOrEmpty( SourceControl ) )
			{
				Trace.WriteLine( "AdapterControl: missing source control" );
				return;
			}
			Control source = Parent.FindControl( SourceControl );
			if ( source == null )
			{
				Trace.WriteLine( "AdapterControl: source control '" + SourceControl + "' not found" );
				return;
			}

			// target
			if ( string.IsNullOrEmpty( TargetControl ) )
			{
				Trace.WriteLine( "AdapterControl: missing target control" );
				return;
			}
			Control target = Parent.FindControl( TargetControl );
			if ( target == null )
			{
				Trace.WriteLine( "AdapterControl: target control '" + TargetControl + "' not found" );
				return;
			}

			switch ( VisibleMode )
			{
				case AdaptMode.Unvaried:
					target.Visible = source.Visible;
					break;
				case AdaptMode.Inverted:
					target.Visible = !source.Visible;
					break;
			}

			if ( target.Visible && EnabledMode != AdaptMode.None )
			{
				WebControl sourceWebControl = source as WebControl;
				WebControl targetWebControl = target as WebControl;
				if ( sourceWebControl != null && targetWebControl != null )
				{
					switch ( EnabledMode )
					{
						case AdaptMode.Unvaried:
							targetWebControl.Enabled = sourceWebControl.Enabled;
							break;
						case AdaptMode.Inverted:
							targetWebControl.Enabled = !sourceWebControl.Enabled;
							break;
					}
				}
			}
		} // OnPreRender

	} // class AdapterControl

} // namespace Itenso.Community.AdapterControl.Controls
// -- EOF -------------------------------------------------------------------