Source/AdvTree/Design/NodeConnectorTypeEditor.cs

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using System;
using System.ComponentModel;
using System.Drawing;
using System.Drawing.Design;
using System.Windows.Forms.Design;
using System.Windows.Forms;
using System.ComponentModel.Design;

namespace DevComponents.AdvTree.Design
{
	/// <summary>
	/// Represents type editor for NodeConnector used for Windows Forms design-time support.
	/// </summary>
	public class NodeConnectorTypeEditor:System.Drawing.Design.UITypeEditor
	{
		#region Private Variables
		private IWindowsFormsEditorService m_EditorService = null;
		private const string OPTION_CREATE="Create new connector";
		private const string OPTION_REMOVE="Remove connector";
		#endregion

		#region Internal Implementation
		public override object EditValue(ITypeDescriptorContext context, IServiceProvider provider, object value) 
		{
			if (context != null
				&& context.Instance != null
				&& provider != null) 
			{				
				NodeConnector conn=value as NodeConnector;
				
				m_EditorService = provider.GetService(typeof(IWindowsFormsEditorService)) as IWindowsFormsEditorService;
								
				if(m_EditorService!=null)
				{
					ListBox lb=new ListBox();
					lb.SelectedIndexChanged+=new EventHandler(this.SelectedChanged);
					if(conn==null)
						lb.Items.Add(OPTION_CREATE);
					else
						lb.Items.Add(OPTION_REMOVE);

					m_EditorService.DropDownControl(lb);
					
					IDesignerHost dh=(IDesignerHost)provider.GetService(typeof(IDesignerHost));
					if(lb.SelectedItem!=null && dh!=null)
					{
						if(lb.SelectedItem.ToString()==OPTION_CREATE)
						{
							NodeConnector nd=dh.CreateComponent(typeof(NodeConnector)) as NodeConnector;
							nd.LineWidth = 1;
							value = nd;
						}
						else if(lb.SelectedItem.ToString()==OPTION_REMOVE)
						{
							value=null;
							dh.DestroyComponent(conn);
						}
					}
				}
			}