Implementing WS-SecureConversation in Microsoft IssueVision

using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Diagnostics;
using System.Drawing;
using System.Resources;
using System.Windows.Forms;

namespace IssueVision
{
	// The IssueTreeView user control implements the view selection ui for IssueVision
	public class IssueTreeView : UserControl, IObserver
	{
		// icons that can appear in the treeview
		private enum TypeIcon
		{
			None = 0,
			AllStaffers = 1,
			Staff = 2,
			Technician = 3
		}
		
		private TreeView trvViews;
		private ImageList images;
		
		private IssueSubject m_subject = null;
		private const string m_fontname = "Tahoma";

		private IContainer components;
		
		public virtual ISubject Subject
		{
			set
			{
				m_subject = (IssueSubject)value;
				m_subject.LookupDataChanged += new IssueSubject.LookupDataChangedEventHandler(this.Subject_LookupDataChanged);
				m_subject.ConflictDataChanged += new IssueSubject.ConflictDataChangedEventHandler(this.Subject_ConflictDataChanged);
			}
		}

		public IssueTreeView()
		{
			InitializeComponent();
		}

		protected override void Dispose(bool disposing)
		{
			if (disposing && components != null)
			{
				components.Dispose();
			}
			base.Dispose(disposing);
		}

		[DebuggerStepThroughAttribute()]
		private void InitializeComponent()
		{
			this.components = new System.ComponentModel.Container();
			System.Resources.ResourceManager resources = new System.Resources.ResourceManager(typeof(IssueTreeView));
			this.trvViews = new System.Windows.Forms.TreeView();
			this.images = new System.Windows.Forms.ImageList(this.components);
			this.SuspendLayout();
			// 
			// trvViews
			// 
			this.trvViews.AllowDrop = true;
			this.trvViews.BorderStyle = System.Windows.Forms.BorderStyle.None;
			this.trvViews.Dock = System.Windows.Forms.DockStyle.Fill;
			this.trvViews.Font = new System.Drawing.Font("Tahoma", 8.25F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, 0);
			this.trvViews.HideSelection = false;
			this.trvViews.ImageList = this.images;
			this.trvViews.Location = new System.Drawing.Point(1, 1);
			this.trvViews.Name = "trvViews";
			this.trvViews.Size = new System.Drawing.Size(190, 334);
			this.trvViews.TabIndex = 9;
			this.trvViews.AfterSelect += new TreeViewEventHandler(this.trvViews_AfterSelect);
			// 
			// images
			// 
			this.images.ColorDepth = System.Windows.Forms.ColorDepth.Depth32Bit;
			this.images.ImageSize = new System.Drawing.Size(16, 16);
			this.images.ImageStream = ((System.Windows.Forms.ImageListStreamer)(resources.GetObject("images.ImageStream")));
			this.images.TransparentColor = System.Drawing.Color.Magenta;
			// 
			// IssueTreeView
			// 
			this.Controls.Add(this.trvViews);
			this.DockPadding.All = 1;
			this.Name = "IssueTreeView";
			this.Size = new System.Drawing.Size(192, 336);
			base.Load += new EventHandler(this.IssueTreeView_Load);
			this.ResumeLayout(false);
		}
		
		private void Subject_LookupDataChanged(object sender, EventArgs e)
		{
			TreeNode staffersNode = trvViews.Nodes[0];
			staffersNode.Nodes.Clear();
			
			foreach (DataRow row in m_subject.Staffers.Rows)
			{
				TreeNode stafferNode = new TreeNode((string)row["DisplayName"]);
				stafferNode.Tag = (int)row["StafferID"];
				
				int icon = (int)GetIconType((string)row["StafferType"]);
				
				stafferNode.ImageIndex = icon;
				stafferNode.SelectedImageIndex = icon;
				staffersNode.Nodes.Add(stafferNode);
			}
			
			trvViews.Nodes[0].ExpandAll();
		}

		private void Subject_ConflictDataChanged(object sender, EventArgs e)
		{
			if (m_subject.HasConflicts)
			{
				trvViews.Nodes[1].Text = "Conflicts (" + m_subject.Conflicts.Rows.Count + ")    ";
				trvViews.Nodes[1].NodeFont = new Font(m_fontname, 8.0F, FontStyle.Bold);
			}
			else
			{
				trvViews.Nodes[1].Text = "Conflicts  ";
				trvViews.Nodes[1].NodeFont = new Font(m_fontname, 8.0F, FontStyle.Bold);
			}
		}

		private void IssueTreeView_Load(object sender, EventArgs e)
		{
			trvViews.Nodes.AddRange(new TreeNode[]{new TreeNode("All Staffers", 1, 1), new TreeNode("Conflicts  ", 4, 4)});
			trvViews.Nodes[1].NodeFont = new Font(m_fontname, 8.0F, FontStyle.Bold);
			
			trvViews.SelectedNode = trvViews.Nodes[0];
		}

		private void trvViews_AfterSelect(object sender, TreeViewEventArgs e)
		{
			if (m_subject != null)
			{
				if (e.Node.Text.StartsWith("Conflicts"))
				{
					m_subject.SetFilter("Conflicts", string.Empty, string.Empty);
				}
				else if (e.Node.Text == "All Staffers")
				{
					m_subject.SetFilter("Issues", string.Empty, string.Empty);
				}
				else
				{
					m_subject.SetFilter("Issues", "StafferID", e.Node.Tag.ToString());
				}
			}
		}

		private int GetIconType(string type)
		{
			switch (type)
			{
				case "H":
					return (int)TypeIcon.Staff;
				case "T":
					return (int)TypeIcon.Technician;
			}

			return (int)TypeIcon.None;
		}		
	}
}