Visual Basic Programming Code Examples

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Use drag and drop in a application



Use drag and drop in a application

'Drag and Drop within a application

Suppose you have a listbox with some elements and want to drag&drop a selected one into 
a textbox. I know there are easier ways to do this but it's just for making the point.

Make a form with a textbox (text1) and a listbox (list1). Fill the listbox with some items... 
Make a label (label1). Set it invisible = False

Put the next code at the appropiate places:

Sub List1_MouseDown (Button as Integer, Shift as Integer, X as Single, Y as Single)
    Dim DY

    DY = TextHeight("A")
    Label1.Move list1.Left, list1.Top + Y - DY / 2, list1.Width, DY
    Label1.Drag

End Sub

Sub List1_DragOver (Source as Control, X as Single, Y as Single, state as Integer)
    If state = 0 Then Source.MousePointer = 12
    If state = 1 Then Source.MousePointer = 0

End Sub

Sub Form_DragOver (Source as Control, X as Single, Y as Single, state as Integer)
    If state = 0 Then Source.MousePointer = 12
    If state = 1 Then Source.MousePointer = 0

End Sub

Sub Text1_DragDrop (Index as Integer, Source as Control, X as Single, Y as Single)
    text1.text = list1
   
End Sub