treeviewdemoform.vb

Mastering VBNet Include Source Code

Option Strict On
Public Class Form1
    Inherits System.Windows.Forms.Form

#Region " Windows Form Designer generated code "

    Public Sub New()
        MyBase.New()

        'This call is required by the Windows Form Designer.
        InitializeComponent()

        'Add any initialization after the InitializeComponent() call

    End Sub

    'Form overrides dispose to clean up the component list.
    Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing Then
            If Not (components Is Nothing) Then
                components.Dispose()
            End If
        End If
        MyBase.Dispose(disposing)
    End Sub
    Friend WithEvents TreeView1 As System.Windows.Forms.TreeView
    Friend WithEvents bttnCategories As System.Windows.Forms.Button
    Friend WithEvents bttnShapes As System.Windows.Forms.Button
    Friend WithEvents bttnPopulate As System.Windows.Forms.Button
    Friend WithEvents Button5 As System.Windows.Forms.Button
    Friend WithEvents bttnPopulateSorted As System.Windows.Forms.Button
    Friend WithEvents brrnClear As System.Windows.Forms.Button
    Friend WithEvents bttnColors As System.Windows.Forms.Button
    Friend WithEvents bttnMoveTree As System.Windows.Forms.Button

    'Required by the Windows Form Designer
    Private components As System.ComponentModel.Container

    'NOTE: The following procedure is required by the Windows Form Designer
    'It can be modified using the Windows Form Designer.  
    'Do not modify it using the code editor.
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.TreeView1 = New System.Windows.Forms.TreeView()
        Me.bttnColors = New System.Windows.Forms.Button()
        Me.Button5 = New System.Windows.Forms.Button()
        Me.bttnPopulateSorted = New System.Windows.Forms.Button()
        Me.bttnShapes = New System.Windows.Forms.Button()
        Me.bttnPopulate = New System.Windows.Forms.Button()
        Me.brrnClear = New System.Windows.Forms.Button()
        Me.bttnCategories = New System.Windows.Forms.Button()
        Me.bttnMoveTree = New System.Windows.Forms.Button()
        Me.SuspendLayout()
        '
        'TreeView1
        '
        Me.TreeView1.Font = New System.Drawing.Font("Comic Sans MS", 12.0!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(161, Byte))
        Me.TreeView1.ImageIndex = -1
        Me.TreeView1.Location = New System.Drawing.Point(8, 8)
        Me.TreeView1.Name = "TreeView1"
        Me.TreeView1.SelectedImageIndex = -1
        Me.TreeView1.Size = New System.Drawing.Size(240, 304)
        Me.TreeView1.TabIndex = 0
        '
        'bttnColors
        '
        Me.bttnColors.Enabled = False
        Me.bttnColors.Font = New System.Drawing.Font("Verdana", 9.75!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(161, Byte))
        Me.bttnColors.Location = New System.Drawing.Point(256, 46)
        Me.bttnColors.Name = "bttnColors"
        Me.bttnColors.Size = New System.Drawing.Size(136, 32)
        Me.bttnColors.TabIndex = 2
        Me.bttnColors.Text = "Add Colors"
        '
        'Button5
        '
        Me.Button5.Font = New System.Drawing.Font("Verdana", 9.75!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(161, Byte))
        Me.Button5.Location = New System.Drawing.Point(256, 160)
        Me.Button5.Name = "Button5"
        Me.Button5.Size = New System.Drawing.Size(136, 32)
        Me.Button5.TabIndex = 5
        Me.Button5.Text = "Sort Items"
        '
        'bttnPopulateSorted
        '
        Me.bttnPopulateSorted.Font = New System.Drawing.Font("Verdana", 9.75!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(161, Byte))
        Me.bttnPopulateSorted.Location = New System.Drawing.Point(256, 198)
        Me.bttnPopulateSorted.Name = "bttnPopulateSorted"
        Me.bttnPopulateSorted.Size = New System.Drawing.Size(136, 32)
        Me.bttnPopulateSorted.TabIndex = 6
        Me.bttnPopulateSorted.Text = "Populate Sorted"
        '
        'bttnShapes
        '
        Me.bttnShapes.Enabled = False
        Me.bttnShapes.Font = New System.Drawing.Font("Verdana", 9.75!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(161, Byte))
        Me.bttnShapes.Location = New System.Drawing.Point(256, 84)
        Me.bttnShapes.Name = "bttnShapes"
        Me.bttnShapes.Size = New System.Drawing.Size(136, 32)
        Me.bttnShapes.TabIndex = 3
        Me.bttnShapes.Text = "Add Shapes"
        '
        'bttnPopulate
        '
        Me.bttnPopulate.Font = New System.Drawing.Font("Verdana", 9.75!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(161, Byte))
        Me.bttnPopulate.Location = New System.Drawing.Point(256, 122)
        Me.bttnPopulate.Name = "bttnPopulate"
        Me.bttnPopulate.Size = New System.Drawing.Size(136, 32)
        Me.bttnPopulate.TabIndex = 4
        Me.bttnPopulate.Text = "Populate"
        '
        'brrnClear
        '
        Me.brrnClear.Font = New System.Drawing.Font("Verdana", 9.75!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(161, Byte))
        Me.brrnClear.Location = New System.Drawing.Point(256, 236)
        Me.brrnClear.Name = "brrnClear"
        Me.brrnClear.Size = New System.Drawing.Size(136, 32)
        Me.brrnClear.TabIndex = 6
        Me.brrnClear.Text = "Clear Control"
        '
        'bttnCategories
        '
        Me.bttnCategories.Font = New System.Drawing.Font("Verdana", 9.75!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(161, Byte))
        Me.bttnCategories.Location = New System.Drawing.Point(256, 8)
        Me.bttnCategories.Name = "bttnCategories"
        Me.bttnCategories.Size = New System.Drawing.Size(136, 32)
        Me.bttnCategories.TabIndex = 1
        Me.bttnCategories.Text = "Add Categories"
        '
        'bttnMoveTree
        '
        Me.bttnMoveTree.Font = New System.Drawing.Font("Verdana", 9.75!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(161, Byte))
        Me.bttnMoveTree.Location = New System.Drawing.Point(256, 274)
        Me.bttnMoveTree.Name = "bttnMoveTree"
        Me.bttnMoveTree.Size = New System.Drawing.Size(136, 32)
        Me.bttnMoveTree.TabIndex = 7
        Me.bttnMoveTree.Text = "Move Tree"
        '
        'Form1
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
        Me.ClientSize = New System.Drawing.Size(398, 319)
        Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.bttnMoveTree, Me.brrnClear, Me.bttnPopulateSorted, Me.Button5, Me.bttnPopulate, Me.bttnShapes, Me.bttnColors, Me.bttnCategories, Me.TreeView1})
        Me.Name = "Form1"
        Me.Text = "TreeView Demo"
        Me.ResumeLayout(False)

    End Sub

#End Region

    Private Sub bttnCategories_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles bttnCategories.Click
        TreeView1.Nodes.Add("Shapes")
        TreeView1.Nodes.Add("Solids")
        TreeView1.Nodes.Add("Colors")
        EnableButtons()
    End Sub

    Private Sub bttnColors_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles bttnColors.Click
        Dim cnode As TreeNode
        cnode = TreeView1.Nodes(2)
        cnode.Nodes.Add("Pink")
        cnode.Nodes.Add("Maroon")
        cnode.Nodes.Add("Teal")
        cnode.Expand()
    End Sub

    Private Sub bttnShapes_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles bttnShapes.Click
        Dim cnode As TreeNode
        cnode = TreeView1.Nodes(0)
        cnode.Nodes.Add("Square")
        cnode.Nodes.Add("Triangle")
        cnode.Nodes.Add("Circle")
    End Sub

    Private Sub bttnPopulate_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles bttnPopulate.Click
        Dim cnode As TreeNode

        TreeView1.Nodes.Add("Shapes")
        TreeView1.Nodes.Add("Solids")
        TreeView1.Nodes.Add("Colors")

        cnode = TreeView1.Nodes(0)
        cnode = TreeView1.Nodes(0)
        cnode.Nodes.Add("Square")
        cnode.Nodes.Add("Triangle")
        cnode.Nodes.Add("Circle")

        cnode = TreeView1.Nodes(2)
        cnode.Nodes.Add("Pink")
        cnode.Nodes.Add("Maroon")
        cnode.Nodes.Add("Teal")
        cnode.Expand()

    End Sub

    Private Sub bttnPopulateSorted_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles bttnPopulateSorted.Click
        TreeView1.Sorted = True
        bttnPopulate_Click(sender, e)
    End Sub

    Private Sub Button5_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button5.Click
        TreeView1.Sorted = True
    End Sub

    Private Sub brrnClear_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles brrnClear.Click
        TreeView1.Nodes.Clear()
        DisableButtons()
    End Sub

    Sub EnableButtons()
        bttnColors.Enabled = True
        bttnShapes.Enabled = True
    End Sub

    Sub DisableButtons()
        bttnColors.Enabled = False
        bttnShapes.Enabled = False
    End Sub


    ' Notice that you can't move the entire tree under the same root twice.
    ' If you click this button for a second time, a run-time error will occur
    Private Sub bttnMoveTree_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles bttnMoveTree.Click
        Dim colorNode, shapeNode, solidNode As TreeNode
        colorNode = TreeView1.Nodes(0)
        shapeNode = TreeView1.Nodes(1)
        solidNode = TreeView1.Nodes(2)
        TreeView1.Nodes.Clear()
        TreeView1.Nodes.Add("Items")
        TreeView1.Nodes(0).Nodes.Add(colorNode)
        TreeView1.Nodes(0).Nodes.Add(shapeNode)
        TreeView1.Nodes(0).Nodes.Add(solidNode)
    End Sub
End Class