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How To Set the Column Width of Columns in a ListView Control

This article was previously published under Q147666
SUMMARY
The width of a column in a ListView control cannot be set by using aproperty and/or method when the View property is set to List. This articleprovides a generic procedure that can be used to set the width of a columnin a ListView control when in List view. This function can also be used toset the column width when in Report view, although this is unnecessarybecause the column width can be set via the Width property of theColumnHeader object when in Report view.
MORE INFORMATION
The ListView_SetColumnWidth procedure sets the column width by sending aLVM_SETCOLUMNWIDTH message to the ListView control that is passed as itsfirst argument. The comment section preceding the function body in step 5explains the required and optional parameters.

To use this procedure, follow these steps:
  1. Start Visual Basic. Form1 is created by default.
  2. Add a single ListView control and one command button to the form.
  3. Add this declaration to the General Declarations section of the form:
          Private Declare Function         SendMessage Lib "USER32" Alias "SendMessageA" ( _                ByVal hwnd As Long, _                ByVal Msg As Long, ByVal wParam As Long, _                ByVal lParam As Long) As Long						
  4. Add the following code to the command button's Click event. This demonstrates a sample call to the ListView_SetColumnWidth procedure and the addition of items that demonstrate the change in width:
          Private Sub Command1_Click()         Dim Item As ListItem         ListView1.View = lvwList         Set Item = ListView1.ListItems.Add         Item.Text = "This is a very long line of text"         Doevents         ListView_SetColumnWidth ListView1         ' To Run this in Visual Basic 4.0, comment out the above lines         ' and uncomment the following lines         '         ' Dim Item As ListItem         ' ListView1.View = lvwList         ' ListView_SetColumnWidth ListView1         ' Set Item = ListView1.ListItems.Add         ' Item.Text = "This is a very long line of text"      End Sub						
  5. Add the following ListView_SetColumnWidth procedure to the form:
    '=====================================================================' Title: ListView_SetColumnWidth'' Purpose: Sends a LVM_SETCOLUMNWIDTH message to the listview control to' set its column width' for List and Report views'' Parameters:'      lvw  - ListView control object where the column width will be set''     [iCol] - Specifies the column for which the width will be set'              only valid in Report view. Ignored for List view.''     [vTxt] - Optional variant containing either a numeric value'              representing the desired column width (in pixels) or a text'              string where the column width will be set to match the width'              of the passed in text string.''              If in List view this parameter is not provided, then the'              column width is set to the width of the ListView (lvw)'              control.''              If in Report view this parameter is not provided, the column'              width is not set.'=====================================================================   Sub ListView_SetColumnWidth(ByVal lvw As ListView, _                               Optional ByVal iCol As Variant, _                               Optional ByVal vTxt As Variant)   Const LVSCW_AUTOSIZE = -1   Const LVSCW_AUTOSIZE_USEHEADER = -2   Const LVM_FIRST = &H1000   Const LVM_GETCOLUMNWIDTH = LVM_FIRST + 29   Const LVM_SETCOLUMNWIDTH = LVM_FIRST + 30   Dim sm As Integer   Dim lWidth As Long   '   ' Abort if the control's hWnd isn't set or if is not in   ' the List or Report views.   If lvw.hwnd = 0& Or (lvw.View <> lvwList And lvw.View <> lvwReport) Then   Exit Sub   End If   '   ' Remember the ScaleMode of the Form   ' and set Form.ScaleMode to Pixels to match the ListView's intrinsic   ' ScaleMode   '   sm = lvw.Parent.ScaleMode   lvw.Parent.ScaleMode = vbPixels   If IsMissing(iCol) Then   If lvw.View = lvwList Then         iCol = 0        ElseIf lvw.View = lvwReport Then             '             'iCol must be provided in report view             '             lvw.Parent.ScaleMode = sm             Exit Sub         End If   End If   '   ' Set the desired column width   ' If a text string is provided set the column width   ' based on the text   '   If IsMissing(vTxt) Then   vTxt = ""        If lvw.View = lvwList Then             '             ' 5 millimeters (via the ScaleX statement) is tacked on to             ' compensate for the 5 millimeter border that the parent             ' class applies to the column width.             '             lWidth = lvw.Width + ScaleX(5, vbMillimeters, vbPixels)        ElseIf lvw.View = lvwReport Then             '             ' The vTxt parameter must be provided in Report view             '             lvw.Parent.ScaleMode = sm             Exit Sub        End If   Else   '        ' 5 millimeters (via the ScaleX statement) is tacked on        ' to compensate for the 5 millimeter border that the parent class        ' applies to the column width        '        If IsNumeric(vTxt) Then         '         ' Numeric width is provided         '             lWidth = vTxt + ScaleX(5, vbMillimeters, vbPixels)        Else             lWidth = TextWidth(vTxt) + ScaleX(5, vbMillimeters, vbPixels)        End If   End If   SendMessage ListView1.hwnd, LVM_SETCOLUMNWIDTH, CLng(iCol), lWidth   lvw.Parent.ScaleMode = sm   End Sub						
  6. Press the F5 key or select Start from the Run menu to run the application. Click the command button to execute the ListView_SetColumnWidth subroutine.
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Article ID: 147666 - Last Review: 07/13/2004 15:48:00 - Revision: 2.1

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