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Horizontal Scroll for listbox

Posted on 1998-09-30
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Last Modified: 2012-06-22
Anyone have the code for horizontal scroll in listbox?  I think there is an API to determine this.


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Question by:SPECIALIST
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by:tward
ID: 1437433
Public Const LB_SETHORIZONTALEXTENT = &H194

Public Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, ByRef lParam As Long) As Long


Public Sub AddHScrollToListBox(ByVal FormWithControl As Form, ByVal ListBox As Control, ByVal FullString As String)

  Dim ListHwnd As Long
  Static GreatestWidth As Long

  ' Get Focus of the ListBox to Make A Horizontal Scroll Bar For '
  ListBox.SetFocus
  ListHwnd = GetFocus()

  If FormWithControl.TextWidth(FullString) > GreatestWidth Then

    ' Add/Change Size of Horizontal Scroll Bar '
    Call SendMessage(ListHwnd, LB_SETHORIZONTALEXTENT, FormWithControl.TextWidth(FullString), NUL)
    GreatestWidth = FormWithControl.TextWidth(FullString)
    DoEvents

  End If

End Sub


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Author Comment

by:SPECIALIST
ID: 1437434
Thanks I just have one error Getfocus says "sub or function not defined"

Just need that sub!

Specialist
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Accepted Solution

by:
CarlosJac earned 50 total points
ID: 1437435
Declare Function GetFocus Lib "user32" Alias "GetFocus" () As Long

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LVL 10

Expert Comment

by:viktornet
ID: 1437436
Public Declare Function SendMessage Lib "user32" Alias "SendMessageA"
     (ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long,
     ByRef lParam As Long) As Long

const LB_SETHORIZONTALEXTENT = 404

dim s as long

s = SendMessage(ListBox1.hWnd, LB_SETHORIZONTALEXTENT, 500, 0)

//Can you do like this in VB???->>> ListBox1.hWnd

Regards,
Viktor Ivanov
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Expert Comment

by:tward
ID: 1437437
Sorry about that, forgot the one declaration.  I would have posted it but someone beat me to it...
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Author Comment

by:SPECIALIST
ID: 1437438
tward,

sorry I know you answered first, but I asked for clarification, after a few hours I had to re-post due to time limitations.

Sorry!
Specialist

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Author Comment

by:SPECIALIST
ID: 1437439
One other thing, what is the 3rd argument?  fullstring as string?

should be ok after that!

Thanks
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Expert Comment

by:tward
ID: 1437440
The function I did gets called after anything is added to the Listbox so I pass the string that was added and try to calculate the size of the Scroll bar based on the Text that was added.
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by:SPECIALIST
ID: 1437441
Thanks!
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Expert Comment

by:Vingamel
ID: 2509106
Can somebody provide an example of calling this API function?  Thanks.
--Vingamel
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