Custom TreeView
/*
User Interfaces in C#: Windows Forms and Custom Controls
by Matthew MacDonald
Publisher: Apress
ISBN: 1590590457
*/
using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
namespace CustomTreeView
{
/// <summary>
/// Summary description for Form1.
/// </summary>
public class CustomTreeView : System.Windows.Forms.Form
{
internal System.Windows.Forms.ImageList imagesTree;
private ProjectTree tree;
private System.ComponentModel.IContainer components;
public CustomTreeView()
{
//
// Required for Windows Form Designer support
//
InitializeComponent();
//
// TODO: Add any constructor code after InitializeComponent call
//
}
/// <summary>
/// Clean up any resources being used.
/// </summary>
protected override void Dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}
#region Windows Form Designer generated code
/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeComponent()
{
this.components = new System.ComponentModel.Container();
// System.Resources.ResourceManager resources = new System.Resources.ResourceManager(typeof(CustomTreeView));
this.imagesTree = new System.Windows.Forms.ImageList(this.components);
this.tree = new ProjectTree();
this.SuspendLayout();
//
// imagesTree
//
this.imagesTree.ColorDepth = System.Windows.Forms.ColorDepth.Depth8Bit;
this.imagesTree.ImageSize = new System.Drawing.Size(16, 16);
// this.imagesTree.ImageStream = ((System.Windows.Forms.ImageListStreamer)(resources.GetObject("imagesTree.ImageStream")));
this.imagesTree.TransparentColor = System.Drawing.Color.Transparent;
//
// tree
//
this.tree.Font = new System.Drawing.Font("Tahoma", 8.25F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
this.tree.ImageList = this.imagesTree;
this.tree.Location = new System.Drawing.Point(8, 4);
this.tree.Name = "tree";
this.tree.Nodes.AddRange(new System.Windows.Forms.TreeNode[] {
new System.Windows.Forms.TreeNode("Unassigned", 0, 0),
new System.Windows.Forms.TreeNode("In Progress", 1, 1),
new System.Windows.Forms.TreeNode("Closed", 2, 2)});
this.tree.Scrollable = false;
this.tree.Size = new System.Drawing.Size(320, 296);
this.tree.TabIndex = 0;
//
// CustomTreeView
//
this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
this.ClientSize = new System.Drawing.Size(336, 310);
this.Controls.AddRange(new System.Windows.Forms.Control[] {
this.tree});
this.Name = "CustomTreeView";
this.Text = "ProjectUserTree";
this.Load += new System.EventHandler(this.Form1_Load);
this.ResumeLayout(false);
}
#endregion
/// <summary>
/// The main entry point for the application.
/// </summary>
[STAThread]
static void Main()
{
Application.Run(new CustomTreeView());
}
private void Form1_Load(object sender, System.EventArgs e)
{
tree.AddProject("Migration to .NET", ProjectTree.StatusType.InProgress);
tree.AddProject("Revamp pricing site", ProjectTree.StatusType.Unassigned);
tree.AddProject("Prepare L-DAP feasibility report", ProjectTree.StatusType.Unassigned);
tree.AddProject("Update E201-G to Windows XP", ProjectTree.StatusType.Closed);
tree.AddProject("Annual meeting", ProjectTree.StatusType.Closed);
}
}
public class ProjectTree : TreeView
{
// Use an enumeration to represent the three types of nodes.
// Specific numbers correspond to the database field code.
public enum StatusType
{
Unassigned = 101,
InProgress = 102,
Closed = 103
}
// Store references to the three main node branches.
private TreeNode nodeUnassigned = new TreeNode("Unassigned", 0, 0);
private TreeNode nodeInProgress = new TreeNode("In Progress", 1, 1);
private TreeNode nodeClosed = new TreeNode("Closed", 2, 2);
// Add the main level of nodes when the control is instantiated.
public ProjectTree() : base()
{
base.Nodes.Add(nodeUnassigned);
base.Nodes.Add(nodeInProgress);
base.Nodes.Add(nodeClosed);
}
// Provide a specialized method the client can use to add nodes.
public void AddProject(string name, StatusType status)
{
TreeNode nodeNew = new TreeNode(name, 3, 4);
nodeNew.Tag = status;
switch (status)
{
case StatusType.Unassigned:
nodeUnassigned.Nodes.Add(nodeNew);
break;
case StatusType.InProgress:
nodeInProgress.Nodes.Add(nodeNew);
break;
case StatusType.Closed:
nodeClosed.Nodes.Add(nodeNew);
break;
}
}
}
public class ProjectUserTree : TreeView
{
// Use an enumeration to represent the three types of nodes.
public enum NodeType
{
Project,
User
}
// Define a new type of higher-level event for node selection.
public delegate void ItemSelectEventHandler(object sender,
ItemSelectEventArgs e);
public class ItemSelectEventArgs : EventArgs
{
public NodeType Type;
public DataRow ItemData;
}
// Define the events that use this signature and event arguments.
public event ItemSelectEventHandler UserSelect;
public event ItemSelectEventHandler ProjectSelect;
// Store references to the two main node branches.
private TreeNode nodeProjects = new TreeNode("Projects", 0, 0);
private TreeNode nodeUsers = new TreeNode("Users", 1, 1);
// Add the main level of nodes when the control is instantiated.
public ProjectUserTree() : base()
{
base.Nodes.Add(nodeProjects);
base.Nodes.Add(nodeUsers);
}
// Provide a specialized method the client can use to add projects.
// Store the corresponding DataRow.
public void AddProject(DataRow project)
{
TreeNode nodeNew = new TreeNode(project["Name"].ToString(), 2, 3);
nodeNew.Tag = project;
nodeProjects.Nodes.Add(nodeNew);
}
// Provide a specialized method the client can use to add users.
// Store the correspnding DataRow.
public void AddUser(DataRow user)
{
TreeNode nodeNew = new TreeNode(user["Name"].ToString(), 2, 3);
nodeNew.Tag = user;
nodeUsers.Nodes.Add(nodeNew);
}
// When a node is selected, retrieve the DataRow and raise the event.
protected override void OnAfterSelect(TreeViewEventArgs e)
{
base.OnAfterSelect(e);
ItemSelectEventArgs arg = new ItemSelectEventArgs();
arg.ItemData = (DataRow)e.Node.Tag;
if (e.Node.Parent == nodeProjects)
{
arg.Type = NodeType.Project;
ProjectSelect(this, arg);
}
else if (e.Node.Parent == nodeUsers)
{
arg.Type = NodeType.User;
UserSelect(this, arg);
}
}
}
}
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