Visual Basic Common Control API Routines
SendMessage: Reposition ListView Columns
Posted:   Friday December 27, 1996
Updated:   Monday December 26, 2011
Applies to:   VB4-32, VB5, VB6
Developed with:   VB4-32, Windows 95
OS restrictions:   None
Author:   VBnet - Randy Birch
This method is intended for Visual Basic 5 or Visual Basic 6 where the Common Control library used is the MSComCtl 5 version (comctl32.ocx). Because the VB6-specific mscomctl.ocx (Common Controls 6) is a complete implementation of comctl32.dll and not reliant on the version of comctl32.dll installed, this routine may not work when applied to a listview created from the VB6-specific mscomctl.ocx.

Enhanced Comctl32 functionality is only available to users with comctl32.dll version 4.70 or greater installed. This dll is typically installed with IE3.x or greater.

This page demonstrates drag/drop to reorder the column headers of a ListView in report view.

By setting a ListView extended style bit using the API SendMessage with the message LVS_EX_HEADERDRAGDROP, clicking then dragging a column header will reposition it along the header. The new location of the header is shown by a coloured bar between the column headers at the new location. Any sorting code utilized is unaffected by this change.

This example does not contain all code required to construct the illustration shown. The routine provided here is designed to be applied to an existing project utilizing a ListView control with subitems.

 BAS Module Code
Place the following code into the general declarations area of a bas module:

Option Explicit
' Copyright 1996-2011 VBnet/Randy Birch, All Rights Reserved.
' Some pages may also contain other copyrights by the author.
' Distribution: You can freely use this code in your own
'               applications, but you may not reproduce 
'               or publish this code on any web site,
'               online service, or distribute as source 
'               on any media without express permission.
Public Declare Function SendMessage Lib "user32" _
   Alias "SendMessageA" _ 
  (ByVal hwnd As Long, _
   ByVal Msg As Long, _ 
   ByVal wParam As Long, _
   lParam As Any) As Long

Public Const LVM_FIRST As Long = &H1000
Public Const LVS_EX_FULLROWSELECT As Long = &H20

Public Const LVS_EX_FULLROWSELECT As Long = &H20
Public Const LVS_EX_GRIDLINES As Long = &H1
Public Const LVS_EX_CHECKBOXES As Long = &H4
Public Const LVS_EX_HEADERDRAGDROP As Long = &H10
 Form Code
Add a check button to the project (Check1) with the caption "Allow Repositioning". Set its initial value to 0. Add the following code to the check button sub:

Option Explicit

Private Sub Check1_Click()

   Dim state As Long
  'state will be true when the checkbox
  'style is 1 (checked) or False when
   state = Check1.Value = 1
  'set the new listview style
   Call SendMessage(ListView1.hwnd, _
                    LVS_EX_HEADERDRAGDROP, ByVal state)

End Sub
Run your project, and populate your ListView as usual. Enable repositioning, then click and drag a column header to a new position in the ListView.


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Copyright 1996-2011 VBnet and Randy Birch. All Rights Reserved.
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