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轻松实现控件间托拽操作 40Star（原作） |
轻松实现控件间托拽操作 40Star（原作）
在Vb.net里实现ListBox之间的托拽，首先要使接受托拽数据的控件的AllowDrop属性设为真。再要处理的就是托拽效果，AllowedEffect是设置托拽的源控件的动作效果，而Effect是设置目标控件的动作。这些东东可以在DragEventArgs Members中查到！
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Dim i As Int32
For i = 0 To 9
ListBox1.Items.Add("Item " & i)
Next
ListBox2.AllowDrop = True
End Sub
Private Sub ListBox1_MouseDown(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles ListBox1.MouseDown
Dim itemIndex As Integer
itemIndex = ListBox1.IndexFromPoint(e.X, e.Y)
If itemIndex >= 0 Then
ListBox1.DoDragDrop(ListBox1.Items(itemIndex), DragDropEffects.Copy)
End If
End Sub
Private Sub ListBox2_DragEnter(ByVal sender As Object, ByVal e As System.Windows.Forms.DragEventArgs) Handles ListBox2.DragEnter
If (e.Data.GetDataPresent(DataFormats.Text)) Then
e.Effect = DragDropEffects.Copy
Else
e.Effect = DragDropEffects.None
End If
End Sub
Private Sub ListBox2_DragDrop(ByVal sender As Object, ByVal e As System.Windows.Forms.DragEventArgs) Handles ListBox2.DragDrop
Dim sItem As String
sItem = e.Data.GetData(DataFormats.Text).ToString
ListBox2.Items.Add(sItem)
ListBox1.Items.RemoveAt(ListBox1.FindString(sItem))
End Sub
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