VB.Net Tutorial/GUI/TreeView — различия между версиями

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Текущая версия на 15:56, 26 мая 2010

Add and remove tree nodes

<source lang="vbnet">Imports System.Windows.Forms public class TreeViewAddDeleteItem

  public Shared Sub Main
       Application.Run(New Form1)
  End Sub

End class Public Class Form1

   Inherits System.Windows.Forms.Form
   Public Sub New()
       MyBase.New()
       InitializeComponent()
   End Sub
   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
   Private components As System.ruponentModel.IContainer
   Friend WithEvents TreeView1 As System.Windows.Forms.TreeView
   Friend WithEvents Button1 As System.Windows.Forms.Button
   Friend WithEvents Button2 As System.Windows.Forms.Button
   <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
       Me.TreeView1 = New System.Windows.Forms.TreeView
       Me.Button1 = New System.Windows.Forms.Button
       Me.Button2 = New System.Windows.Forms.Button
       Me.SuspendLayout()
       "
       "TreeView1
       "
       Me.TreeView1.ImageIndex = -1
       Me.TreeView1.Location = New System.Drawing.Point(48, 16)
       Me.TreeView1.Name = "TreeView1"
       Me.TreeView1.Nodes.AddRange(New System.Windows.Forms.TreeNode() {New System.Windows.Forms.TreeNode("a", New System.Windows.Forms.TreeNode() {New System.Windows.Forms.TreeNode("Visual Basic"), New System.Windows.Forms.TreeNode("Visual C++"), New System.Windows.Forms.TreeNode("Delphi"), New System.Windows.Forms.TreeNode("Java")}), New System.Windows.Forms.TreeNode("B", New System.Windows.Forms.TreeNode() {New System.Windows.Forms.TreeNode("B1"), New System.Windows.Forms.TreeNode("B2"), New System.Windows.Forms.TreeNode("B3"), New System.Windows.Forms.TreeNode("B4")})})
       Me.TreeView1.SelectedImageIndex = -1
       Me.TreeView1.Size = New System.Drawing.Size(200, 168)
       Me.TreeView1.TabIndex = 0
       "
       "Button1
       "
       Me.Button1.Location = New System.Drawing.Point(48, 200)
       Me.Button1.Name = "Button1"
       Me.Button1.Size = New System.Drawing.Size(80, 24)
       Me.Button1.TabIndex = 1
       Me.Button1.Text = "Add"
       "
       "Button2
       "
       Me.Button2.Location = New System.Drawing.Point(176, 200)
       Me.Button2.Name = "Button2"
       Me.Button2.Size = New System.Drawing.Size(80, 24)
       Me.Button2.TabIndex = 2
       Me.Button2.Text = "Delete"
       "
       "Form1
       "
       Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
       Me.ClientSize = New System.Drawing.Size(292, 238)
       Me.Controls.Add(Me.Button2)
       Me.Controls.Add(Me.Button1)
       Me.Controls.Add(Me.TreeView1)
       Me.ResumeLayout(False)
   End Sub
   Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
       Dim str As New TreeNode
       TreeView1.SelectedNode.Nodes.Add("New")
   End Sub
   Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
       TreeView1.Nodes.Remove(TreeView1.SelectedNode)
   End Sub

End Class</source>

Build file tree recursively

<source lang="vbnet">Imports System.Drawing Imports System.Drawing.Drawing2D Imports System.Windows.Forms public class BuildFileTree

  public Shared Sub Main
       Application.Run(New Form1)
  End Sub

End class Public Class Form1

   Private Sub ActTraverse_Click(ByVal sender As System.Object,ByVal e As System.EventArgs) Handles ActTraverse.Click
       If (My.ruputer.FileSystem.DirectoryExists(StartPath.Text) = False) Then
           Exit Sub
       End If
       PathTree.Nodes.Clear()
       BuildDirectoryTree(Nothing, StartPath.Text)
   End Sub
   Private Sub BuildDirectoryTree(ByVal fromNode As TreeNode,ByVal basePath As String)
       Dim newDirectory As TreeNode
       Dim justTheSubdirectory As String
       For Each oneDirectory As String In My.ruputer.FileSystem.GetDirectories(basePath)
           justTheSubdirectory = My.ruputer.FileSystem.GetName(oneDirectory)
           If (fromNode Is Nothing) Then
               newDirectory = PathTree.Nodes.Add( justTheSubdirectory)
           Else
               newDirectory = fromNode.Nodes.Add(justTheSubdirectory)
           End If
           BuildDirectoryTree(newDirectory, My.ruputer.FileSystem.rubinePath(basePath, justTheSubdirectory))
       Next oneDirectory
   End Sub

End Class

<Global.Microsoft.VisualBasic.rupilerServices.DesignerGenerated()> _ Partial Class Form1

   Inherits System.Windows.Forms.Form
   "Form overrides dispose to clean up the component list.
   <System.Diagnostics.DebuggerNonUserCode()> _
   Protected Overrides Sub Dispose(ByVal disposing As Boolean)
       If disposing AndAlso components IsNot Nothing Then
           components.Dispose()
       End If
       MyBase.Dispose(disposing)
   End Sub
   "Required by the Windows Form Designer
   Private components As System.ruponentModel.IContainer
   "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.ActTraverse = New System.Windows.Forms.Button
       Me.StartPath = New System.Windows.Forms.TextBox
       Me.PathTree = New System.Windows.Forms.TreeView
       Me.Label1 = New System.Windows.Forms.Label
       Me.Label2 = New System.Windows.Forms.Label
       Me.SuspendLayout()
       "
       "ActTraverse
       "
       Me.ActTraverse.Location = New System.Drawing.Point(326, 32)
       Me.ActTraverse.Name = "ActTraverse"
       Me.ActTraverse.Size = New System.Drawing.Size(75, 23)
       Me.ActTraverse.TabIndex = 2
       Me.ActTraverse.Text = "Traverse"
       Me.ActTraverse.UseVisualStyleBackColor = True
       "
       "StartPath
       "
       Me.StartPath.Location = New System.Drawing.Point(72, 8)
       Me.StartPath.Name = "StartPath"
       Me.StartPath.Size = New System.Drawing.Size(328, 20)
       Me.StartPath.TabIndex = 1
       "
       "PathTree
       "
       Me.PathTree.Location = New System.Drawing.Point(72, 64)
       Me.PathTree.Name = "PathTree"
       Me.PathTree.Size = New System.Drawing.Size(329, 184)
       Me.PathTree.TabIndex = 4
       "
       "Label1
       "
       Me.Label1.AutoSize = True
       Me.Label1.Location = New System.Drawing.Point(8, 10)
       Me.Label1.Name = "Label1"
       Me.Label1.Size = New System.Drawing.Size(57, 13)
       Me.Label1.TabIndex = 0
       Me.Label1.Text = "Start Path:"
       "
       "Label2
       "
       Me.Label2.AutoSize = True
       Me.Label2.Location = New System.Drawing.Point(8, 66)
       Me.Label2.Name = "Label2"
       Me.Label2.Size = New System.Drawing.Size(57, 13)
       Me.Label2.TabIndex = 3
       Me.Label2.Text = "Path Tree:"
       "
       "Form1
       "
       Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 13.0!)
       Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font
       Me.ClientSize = New System.Drawing.Size(411, 260)
       Me.Controls.Add(Me.Label2)
       Me.Controls.Add(Me.Label1)
       Me.Controls.Add(Me.PathTree)
       Me.Controls.Add(Me.StartPath)
       Me.Controls.Add(Me.ActTraverse)
       Me.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedSingle
       Me.MaximizeBox = False
       Me.Name = "Form1"
       Me.Text = "Directory Traversal"
       Me.ResumeLayout(False)
       Me.PerformLayout()
   End Sub
   Friend WithEvents ActTraverse As System.Windows.Forms.Button
   Friend WithEvents StartPath As System.Windows.Forms.TextBox
   Friend WithEvents PathTree As System.Windows.Forms.TreeView
   Friend WithEvents Label1 As System.Windows.Forms.Label
   Friend WithEvents Label2 As System.Windows.Forms.Label

End Class</source>

Creating Tree Views in Code

<source lang="vbnet">Imports System.Drawing Imports System.Drawing.Drawing2D Imports System.Windows.Forms public class TreeViewCreationInCode

  public Shared Sub Main
       Application.Run(New Form1)
  End Sub

End class Public Class Form1

   Inherits System.Windows.Forms.Form
   Dim TreeView1 As TreeView
   Public Sub New()
       MyBase.New()
       Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
       Me.ClientSize = New System.Drawing.Size(292, 293)
       TreeView1 = New TreeView
       TreeView1.Location = New Point(75, 100)
       TreeView1.Size = New Size(150, 150)
       Controls.Add(TreeView1)
       TreeView1.Nodes.Clear()
       Dim RootNode = New TreeNode("Root")
       TreeView1.Nodes.Add(RootNode)
       TreeView1.Nodes(0).Nodes.Add(New TreeNode("Node 1"))
       For intLoopIndex As Integer = 2 To 3
           TreeView1.Nodes(0).Nodes(0).Nodes.Add(New _
               TreeNode("Node" & Str(intLoopIndex)))
       Next intLoopIndex
       TreeView1.Nodes(0).Nodes.Add(New TreeNode("Node 4"))
       For intLoopIndex As Integer = 5 To 6
           TreeView1.Nodes(0).Nodes(1).Nodes.Add(New _
               TreeNode("Node" & Str(intLoopIndex)))
       Next intLoopIndex
   End Sub

End Class</source>

Tree Node selection event

<source lang="vbnet">Imports System.Windows.Forms public class SplitterControl

  public Shared Sub Main
       Application.Run(New Form1)
  End Sub

End class Public Class Form1

   Inherits System.Windows.Forms.Form
   Public Sub New()
       MyBase.New()
       InitializeComponent()
   End Sub
   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
   Private components As System.ruponentModel.IContainer
   Friend WithEvents Splitter1 As System.Windows.Forms.Splitter
   Friend WithEvents TreeView1 As System.Windows.Forms.TreeView
   Friend WithEvents ImageList1 As System.Windows.Forms.ImageList
   Friend WithEvents Splitter2 As System.Windows.Forms.Splitter
   Friend WithEvents Panel1 As System.Windows.Forms.Panel
   Friend WithEvents Label1 As System.Windows.Forms.Label
   Friend WithEvents Splitter3 As System.Windows.Forms.Splitter
   Friend WithEvents ListView1 As System.Windows.Forms.ListView
   <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
       Me.ruponents = New System.ruponentModel.Container
       Me.Splitter1 = New System.Windows.Forms.Splitter
       Me.TreeView1 = New System.Windows.Forms.TreeView
       Me.ImageList1 = New System.Windows.Forms.ImageList(Me.ruponents)
       Me.Splitter2 = New System.Windows.Forms.Splitter
       Me.Panel1 = New System.Windows.Forms.Panel
       Me.Label1 = New System.Windows.Forms.Label
       Me.Splitter3 = New System.Windows.Forms.Splitter
       Me.ListView1 = New System.Windows.Forms.ListView
       Me.Panel1.SuspendLayout()
       Me.SuspendLayout()
       "
       "Splitter1
       "
       Me.Splitter1.Location = New System.Drawing.Point(0, 0)
       Me.Splitter1.Name = "Splitter1"
       Me.Splitter1.Size = New System.Drawing.Size(3, 266)
       Me.Splitter1.TabIndex = 0
       Me.Splitter1.TabStop = False
       "
       "TreeView1
       "
       Me.TreeView1.Dock = System.Windows.Forms.DockStyle.Left
       Me.TreeView1.Location = New System.Drawing.Point(3, 0)
       Me.TreeView1.Name = "TreeView1"
       Me.TreeView1.Nodes.AddRange(New System.Windows.Forms.TreeNode() {New System.Windows.Forms.TreeNode("A", New System.Windows.Forms.TreeNode() {New System.Windows.Forms.TreeNode("Visual Basic"), New System.Windows.Forms.TreeNode("Visual C++"), New System.Windows.Forms.TreeNode("Delphi"), New System.Windows.Forms.TreeNode("Java")}), New System.Windows.Forms.TreeNode("B", New System.Windows.Forms.TreeNode() {New System.Windows.Forms.TreeNode("1"), New System.Windows.Forms.TreeNode("2"), New System.Windows.Forms.TreeNode("3"), New System.Windows.Forms.TreeNode("4")})})
       Me.TreeView1.Size = New System.Drawing.Size(101, 266)
       Me.TreeView1.TabIndex = 1
       "
       "Splitter2
       "
       Me.Splitter2.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D
       Me.Splitter2.Location = New System.Drawing.Point(104, 0)
       Me.Splitter2.Name = "Splitter2"
       Me.Splitter2.Size = New System.Drawing.Size(8, 266)
       Me.Splitter2.TabIndex = 2
       Me.Splitter2.TabStop = False
       "
       "Panel1
       "
       Me.Panel1.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D
       Me.Panel1.Controls.Add(Me.ListView1)
       Me.Panel1.Controls.Add(Me.Splitter3)
       Me.Panel1.Controls.Add(Me.Label1)
       Me.Panel1.Dock = System.Windows.Forms.DockStyle.Top
       Me.Panel1.Location = New System.Drawing.Point(112, 0)
       Me.Panel1.Name = "Panel1"
       Me.Panel1.Size = New System.Drawing.Size(248, 264)
       Me.Panel1.TabIndex = 3
       "
       "Label1
       "
       Me.Label1.Dock = System.Windows.Forms.DockStyle.Top
       Me.Label1.Location = New System.Drawing.Point(0, 0)
       Me.Label1.Name = "Label1"
       Me.Label1.Size = New System.Drawing.Size(244, 32)
       Me.Label1.TabIndex = 0
       Me.Label1.Text = "Label1"
       "
       "Splitter3
       "
       Me.Splitter3.Dock = System.Windows.Forms.DockStyle.Top
       Me.Splitter3.Location = New System.Drawing.Point(0, 32)
       Me.Splitter3.Name = "Splitter3"
       Me.Splitter3.Size = New System.Drawing.Size(244, 8)
       Me.Splitter3.TabIndex = 1
       Me.Splitter3.TabStop = False
       "
       "ListView1
       "
       Me.ListView1.Dock = System.Windows.Forms.DockStyle.Fill
       Me.ListView1.Location = New System.Drawing.Point(0, 40)
       Me.ListView1.Name = "ListView1"
       Me.ListView1.Size = New System.Drawing.Size(244, 220)
       Me.ListView1.TabIndex = 2
       "
       "Form1
       "
       Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
       Me.ClientSize = New System.Drawing.Size(360, 266)
       Me.Controls.Add(Me.Panel1)
       Me.Controls.Add(Me.Splitter2)
       Me.Controls.Add(Me.TreeView1)
       Me.Controls.Add(Me.Splitter1)
       Me.Panel1.ResumeLayout(False)
       Me.ResumeLayout(False)
   End Sub
   Private Sub TreeView1_AfterSelect(ByVal sender As System.Object, ByVal e As System.Windows.Forms.TreeViewEventArgs) Handles TreeView1.AfterSelect
       Dim childnum, index, i As Int32
       childnum = TreeView1.SelectedNode.GetNodeCount(False)
       index = TreeView1.SelectedNode.Index
       index = index + 1
       ListView1.Items.Clear()
       For i = 0 To childnum - 1
           ListView1.Items.Add(index.ToString + "." + i.ToString, 1)
       Next
       Label1.Text = TreeView1.SelectedNode.FullPath
   End Sub

End Class</source>

TreeView CheckBox

<source lang="vbnet">Imports System.Drawing Imports System.Drawing.Drawing2D Imports System.Windows.Forms public class TreeViewSelectionCheckBoxes

  public Shared Sub Main
       Application.Run(New Form1)
  End Sub

End class Public Class Form1

   Inherits System.Windows.Forms.Form
  1. 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
   "Required by the Windows Form Designer
   Private components As System.ruponentModel.IContainer
   "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.
   Friend WithEvents TreeView1 As System.Windows.Forms.TreeView
   Friend WithEvents TextBox1 As System.Windows.Forms.TextBox
   Friend WithEvents Button1 As System.Windows.Forms.Button
   <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
       Me.TreeView1 = New System.Windows.Forms.TreeView
       Me.TextBox1 = New System.Windows.Forms.TextBox
       Me.Button1 = New System.Windows.Forms.Button
       Me.SuspendLayout()
       "
       "TreeView1
       "
       Me.TreeView1.ImageIndex = -1
       Me.TreeView1.Location = New System.Drawing.Point(88, 64)
       Me.TreeView1.Name = "TreeView1"
       Me.TreeView1.Nodes.AddRange(New System.Windows.Forms.TreeNode() {New System.Windows.Forms.TreeNode("Root", New System.Windows.Forms.TreeNode() {New System.Windows.Forms.TreeNode("Node 1", New System.Windows.Forms.TreeNode() {New System.Windows.Forms.TreeNode("Node 2"), New System.Windows.Forms.TreeNode("Node 3")}), New System.Windows.Forms.TreeNode("Node 4", New System.Windows.Forms.TreeNode() {New System.Windows.Forms.TreeNode("Node 5"), New System.Windows.Forms.TreeNode("Node 6")})})})
       Me.TreeView1.SelectedImageIndex = -1
       Me.TreeView1.Size = New System.Drawing.Size(121, 120)
       Me.TreeView1.TabIndex = 0
       "
       "TextBox1
       "
       Me.TextBox1.Location = New System.Drawing.Point(88, 200)
       Me.TextBox1.Name = "TextBox1"
       Me.TextBox1.Size = New System.Drawing.Size(120, 20)
       Me.TextBox1.TabIndex = 1
       Me.TextBox1.Text = ""
       "
       "Button1
       "
       Me.Button1.Location = New System.Drawing.Point(88, 232)
       Me.Button1.Name = "Button1"
       Me.Button1.Size = New System.Drawing.Size(120, 23)
       Me.Button1.TabIndex = 3
       Me.Button1.Text = "Show Check Boxes"
       "
       "Form1
       "
       Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
       Me.ClientSize = New System.Drawing.Size(292, 273)
       Me.Controls.Add(Me.Button1)
       Me.Controls.Add(Me.TextBox1)
       Me.Controls.Add(Me.TreeView1)
       Me.Name = "Form1"
       Me.Text = "Form1"
       Me.ResumeLayout(False)
   End Sub
  1. End Region
   Private Sub TreeView1_AfterSelect(ByVal sender As System.Object, ByVal e As System.Windows.Forms.TreeViewEventArgs) Handles TreeView1.AfterSelect
       TextBox1.Text = e.Node.Text & " was selected."
   End Sub
   Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
       TreeView1.CheckBoxes = True
   End Sub
   Private Sub TreeView1_AfterCheck(ByVal sender As Object, ByVal e As System.Windows.Forms.TreeViewEventArgs) Handles TreeView1.AfterCheck
       If e.Node.Checked Then
           TextBox1.Text = e.Node.Text & " is checked."
       Else
           TextBox1.Text = e.Node.Text & " is not checked."
       End If
   End Sub

End Class</source>

Using a TreeView to display the directory structure

<source lang="vbnet">Imports System.IO Imports System.Windows.Forms public class FileTreeView

  public Shared Sub Main
       Application.Run(New FrmTreeViewDirectory)
  End Sub

End class

Public Class FrmTreeViewDirectory

  Inherits Form
  1. 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
  " contains view of c: drive directory structure
  Friend WithEvents treDirectory As System.Windows.Forms.TreeView
  "Required by the Windows Form Designer
  Private components As System.ruponentModel.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.treDirectory = New System.Windows.Forms.TreeView()
     Me.SuspendLayout()
     "
     "treDirectory
     "
     Me.treDirectory.Dock = System.Windows.Forms.DockStyle.Fill
     Me.treDirectory.ImageIndex = -1
     Me.treDirectory.Name = "treDirectory"
     Me.treDirectory.SelectedImageIndex = -1
     Me.treDirectory.Size = New System.Drawing.Size(296, 293)
     Me.treDirectory.TabIndex = 0
     "
     "FrmTreeViewDirectory
     "
     Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
     Me.ClientSize = New System.Drawing.Size(296, 293)
     Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.treDirectory})
     Me.Name = "FrmTreeViewDirectory"
     Me.Text = "TreeViewDirectoryStructure"
     Me.ResumeLayout(False)
  End Sub
  1. End Region
  Public Sub PopulateTreeView(ByVal directoryValue As String, _
     ByVal parentNode As TreeNode)
     Dim directoryArray As String() = Directory.GetDirectories(directoryValue)
     If directoryArray.Length <> 0 Then 
        Dim currentDirectory As String
        For Each currentDirectory In directoryArray
           Dim myNode As TreeNode = New TreeNode(currentDirectory)
           parentNode.Nodes.Add(myNode)

" PopulateTreeView(currentDirectory, myNode)

        Next
     End If
  End Sub 
  Private Sub FrmTreeViewDirectory_Load(ByVal sender As Object, _
     ByVal e As System.EventArgs) Handles MyBase.Load
     treDirectory.Nodes.Add("C:")
     PopulateTreeView("C:\", treDirectory.Nodes(0))
  End Sub

End Class</source>