VB.Net Tutorial/GUI/Drag Drop — различия между версиями

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Текущая версия на 15:57, 26 мая 2010

Copy and paste Object

<source lang="vbnet">" Requires a reference to System.Xml. Imports System.Xml.Serialization Imports System.IO Imports System.Windows.Forms public class CopyPasteEmployee

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

End class

Public Class Form1

   <Serializable()> _
   Public Class Employee
       Public FirstName As String
       Public LastName As String
       Public Sub New()
       End Sub
       Public Sub New(ByVal first_name As String, ByVal last_name As String)
           FirstName = first_name
           LastName = last_name
       End Sub
   End Class
   " Copy the Employee to the clipboard.
   Private Sub btnCopy_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnCopy.Click
       Dim emp As New Employee(txtFirstName.Text, txtLastName.Text)
       Dim data_object As New DataObject
       data_object.SetData("Employee", emp)
       Clipboard.SetDataObject(data_object)
   End Sub
   " Paste data from the clipboard.
   Private Sub btnPaste_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnPaste.Click
       Dim data_object As IDataObject = Clipboard.GetDataObject()
       If data_object.GetDataPresent("Employee") Then
           Dim emp As Employee = DirectCast(data_object.GetData("Employee"), Employee)
           txtPasteFirstName.Text = emp.FirstName
           txtPasteLastName.Text = emp.LastName
       End If
   End Sub

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

   Inherits System.Windows.Forms.Form
   "Form overrides dispose to clean up the component list.
   <System.Diagnostics.DebuggerNonUserCode()> _
   Protected Overloads 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.btnPaste = New System.Windows.Forms.Button
       Me.txtPasteLastName = New System.Windows.Forms.TextBox
       Me.txtPasteFirstName = New System.Windows.Forms.TextBox
       Me.Label3 = New System.Windows.Forms.Label
       Me.Label4 = New System.Windows.Forms.Label
       Me.btnCopy = New System.Windows.Forms.Button
       Me.txtLastName = New System.Windows.Forms.TextBox
       Me.txtFirstName = New System.Windows.Forms.TextBox
       Me.Label2 = New System.Windows.Forms.Label
       Me.Label1 = New System.Windows.Forms.Label
       Me.SuspendLayout()
       "
       "btnPaste
       "
       Me.btnPaste.Location = New System.Drawing.Point(232, 96)
       Me.btnPaste.Name = "btnPaste"
       Me.btnPaste.Size = New System.Drawing.Size(48, 24)
       Me.btnPaste.TabIndex = 22
       Me.btnPaste.Text = "Paste"
       "
       "txtPasteLastName
       "
       Me.txtPasteLastName.Location = New System.Drawing.Point(72, 112)
       Me.txtPasteLastName.Name = "txtPasteLastName"
       Me.txtPasteLastName.Size = New System.Drawing.Size(136, 20)
       Me.txtPasteLastName.TabIndex = 21
       "
       "txtPasteFirstName
       "
       Me.txtPasteFirstName.Location = New System.Drawing.Point(72, 88)
       Me.txtPasteFirstName.Name = "txtPasteFirstName"
       Me.txtPasteFirstName.Size = New System.Drawing.Size(136, 20)
       Me.txtPasteFirstName.TabIndex = 20
       "
       "Label3
       "
       Me.Label3.AutoSize = True
       Me.Label3.Location = New System.Drawing.Point(8, 112)
       Me.Label3.Name = "Label3"
       Me.Label3.Size = New System.Drawing.Size(54, 13)
       Me.Label3.TabIndex = 19
       Me.Label3.Text = "Last Name"
       "
       "Label4
       "
       Me.Label4.AutoSize = True
       Me.Label4.Location = New System.Drawing.Point(8, 88)
       Me.Label4.Name = "Label4"
       Me.Label4.Size = New System.Drawing.Size(53, 13)
       Me.Label4.TabIndex = 18
       Me.Label4.Text = "First Name"
       "
       "btnCopy
       "
       Me.btnCopy.Location = New System.Drawing.Point(232, 16)
       Me.btnCopy.Name = "btnCopy"
       Me.btnCopy.Size = New System.Drawing.Size(48, 24)
       Me.btnCopy.TabIndex = 17
       Me.btnCopy.Text = "Copy"
       "
       "txtLastName
       "
       Me.txtLastName.Location = New System.Drawing.Point(72, 32)
       Me.txtLastName.Name = "txtLastName"
       Me.txtLastName.Size = New System.Drawing.Size(136, 20)
       Me.txtLastName.TabIndex = 16
       Me.txtLastName.Text = "AAAAAA"
       "
       "txtFirstName
       "
       Me.txtFirstName.Location = New System.Drawing.Point(72, 8)
       Me.txtFirstName.Name = "txtFirstName"
       Me.txtFirstName.Size = New System.Drawing.Size(136, 20)
       Me.txtFirstName.TabIndex = 15
       Me.txtFirstName.Text = "BBBBB"
       "
       "Label2
       "
       Me.Label2.AutoSize = True
       Me.Label2.Location = New System.Drawing.Point(8, 32)
       Me.Label2.Name = "Label2"
       Me.Label2.Size = New System.Drawing.Size(54, 13)
       Me.Label2.TabIndex = 14
       Me.Label2.Text = "Last Name"
       "
       "Label1
       "
       Me.Label1.AutoSize = True
       Me.Label1.Location = New System.Drawing.Point(8, 8)
       Me.Label1.Name = "Label1"
       Me.Label1.Size = New System.Drawing.Size(53, 13)
       Me.Label1.TabIndex = 13
       Me.Label1.Text = "First Name"
       "
       "Form1
       "
       Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 13.0!)
       Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font
       Me.ClientSize = New System.Drawing.Size(288, 139)
       Me.Controls.Add(Me.btnPaste)
       Me.Controls.Add(Me.txtPasteLastName)
       Me.Controls.Add(Me.txtPasteFirstName)
       Me.Controls.Add(Me.Label3)
       Me.Controls.Add(Me.Label4)
       Me.Controls.Add(Me.btnCopy)
       Me.Controls.Add(Me.txtLastName)
       Me.Controls.Add(Me.txtFirstName)
       Me.Controls.Add(Me.Label2)
       Me.Controls.Add(Me.Label1)
       Me.Name = "Form1"
       Me.Text = "CopyPasteEmployee"
       Me.ResumeLayout(False)
       Me.PerformLayout()
   End Sub
   Friend WithEvents btnPaste As System.Windows.Forms.Button
   Friend WithEvents txtPasteLastName As System.Windows.Forms.TextBox
   Friend WithEvents txtPasteFirstName As System.Windows.Forms.TextBox
   Friend WithEvents Label3 As System.Windows.Forms.Label
   Friend WithEvents Label4 As System.Windows.Forms.Label
   Friend WithEvents btnCopy As System.Windows.Forms.Button
   Friend WithEvents txtLastName As System.Windows.Forms.TextBox
   Friend WithEvents txtFirstName As System.Windows.Forms.TextBox
   Friend WithEvents Label2 As System.Windows.Forms.Label
   Friend WithEvents Label1 As System.Windows.Forms.Label

End Class</source>

Drop a file

<source lang="vbnet">Imports System.Data Imports System.Data.OleDb Imports System.Windows.Forms public class FileDrop

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

End class Public Class Form1

   " Allow Copy if there is FileDrop data.
   Private Sub lblDropTarget_DragEnter(ByVal sender As Object, ByVal e As System.Windows.Forms.DragEventArgs) Handles lblDropTarget.DragEnter
       If e.Data.GetDataPresent(DataFormats.FileDrop) Then
           e.Effect = DragDropEffects.Copy
       Else
           e.Effect = DragDropEffects.None
       End If
   End Sub
   " Display the dropped file names.
   Private Sub lblDropTarget_DragDrop(ByVal sender As Object, ByVal e As System.Windows.Forms.DragEventArgs) Handles lblDropTarget.DragDrop
       lstFiles.Items.Clear()
       Dim file_names As String() = DirectCast(e.Data.GetData(DataFormats.FileDrop), String())
       For Each file_name As String In file_names
           lstFiles.Items.Add(file_name)
       Next file_name
   End Sub

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

   Inherits System.Windows.Forms.Form
   "Form overrides dispose to clean up the component list.
   <System.Diagnostics.DebuggerNonUserCode()> _
   Protected Overloads 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.lstFiles = New System.Windows.Forms.ListBox
       Me.lblDropTarget = New System.Windows.Forms.Label
       Me.SuspendLayout()
       "
       "lstFiles
       "
       Me.lstFiles.Dock = System.Windows.Forms.DockStyle.Fill
       Me.lstFiles.FormattingEnabled = True
       Me.lstFiles.Location = New System.Drawing.Point(0, 48)
       Me.lstFiles.Name = "lstFiles"
       Me.lstFiles.Size = New System.Drawing.Size(274, 160)
       Me.lstFiles.TabIndex = 3
       "
       "lblDropTarget
       "
       Me.lblDropTarget.AllowDrop = True
       Me.lblDropTarget.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D
       Me.lblDropTarget.Dock = System.Windows.Forms.DockStyle.Top
       Me.lblDropTarget.Location = New System.Drawing.Point(0, 0)
       Me.lblDropTarget.Name = "lblDropTarget"
       Me.lblDropTarget.Size = New System.Drawing.Size(274, 48)
       Me.lblDropTarget.TabIndex = 2
       Me.lblDropTarget.Text = "Drop Target"
       Me.lblDropTarget.TextAlign = System.Drawing.ContentAlignment.MiddleCenter
       "
       "Form1
       "
       Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 13.0!)
       Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font
       Me.ClientSize = New System.Drawing.Size(274, 210)
       Me.Controls.Add(Me.lstFiles)
       Me.Controls.Add(Me.lblDropTarget)
       Me.Name = "Form1"
       Me.Text = "AcceptFiles"
       Me.ResumeLayout(False)
   End Sub
   Friend WithEvents lstFiles As System.Windows.Forms.ListBox
   Friend WithEvents lblDropTarget As System.Windows.Forms.Label

End Class</source>