BUG: OLE Drag Disabled When ListBox Has Multiple Columns

• Microsoft Visual Basic Learning, Professional, and Enterprise Editions for Windows, version 5.0

SYMPTOMS

A listbox control is set to more than one column and the OLEDragMode property is set to Automatic to allow for OLE Drag-and-Drop. When you attempt to drag an item to another control from any column of the listbox other than the first, the item is not copied to the target control as expected.

RESOLUTION

To work around this problem, initiate the drag from the listbox using the OLEDrag method.

For example, you would add code such as the following to the MouseDown event of the "multi-column" listbox:

    Private Sub List1_MouseDown(Button As Integer, Shift As Integer, _
                                X As Single, Y As Single)
       List1.OLEDrag
    End Sub

STATUS

Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article. We are researching this bug and will post new information here in the Microsoft Knowledge Base as it becomes available.

MORE INFORMATION

Steps to Reproduce Behavior

1. Start a new Standard EXE project in Visual Basic. Form1 is created by default.

2. Add the following controls to Form1 and set the following properties for the appropriate controls:

      Control           Default Name     Property            Setting
      ---------------------------------------------------------------
      Text Box          Text1            Text                <Blank>
                                         OLEDropMode         2 - Automatic
   
      List Box          List1            Columns             2
                                         OLEDragMode         1 - Automatic
   
   

3. Copy the following code to the Module of Form1:

         Option Explicit
   

         Private Sub Form_Load()
            Dim intCounter As Integer
            ' Add some test data to the ListBox
            For intCounter = 1 To 100
               List1.AddItem CStr(intCounter)
            Next
         End Sub
   
         Private Sub List1_MouseDown(Button As Integer, Shift As Integer, _
                                     X As Single, Y As Single)
            ' Uncomment the next line for a simple workaround.
            'List1.OLEDrag
         End Sub
   
   

4. On the Run menu, click Start or press the F5 key to start the program. Select an item from the first column and drag that item to the text box. Note that you must Click and release to select the item, then Click-and- Drag the same item as a second operation. Now, select an item from the second column and drag that item to the text box.

   Result: Note that the item from the first column is copied to the text box, but the item from the second column is not.

5. Choose End from the Run Menu or Click the End button to stop the program. Uncomment the workaround line and repeat step 4.

   Result: Note that both items are now successfully copied to the text box. Also, it no longer requires a Click to select and a second Click- and-Drag to move the item. This can now be a single Click-and-Drag operation.

Keywords          : vb5all
Version           : WINDOWS:5.0
Platform          : WINDOWS
Issue type        : kbbug
Solution Type     : kbpending