Scrolling in list boxes created with _GuiCtrlListBox_Create

[ChrisW]

I need to use the advanced function _GuiCtrlListBox_Create to create a list box which allows multiple selection. However, the control created in this way seems to lack a vertical scrollbar despite the fact that there are too many items to display. I'm creating the list empty, and then adding items with _GUICtrlListBox_AddString - maybe this doesn't trigger a check for whether a scrollbar is necessary after the latest addition? Is there a way to force this - I tried using the $LBS_DISABLENOSCROLL style but makes no difference?

$hgui = GUICreate("Title", 310, 425)
$list = _GuiCtrlListBox_Create($hgui, "", 5, 5, 300, 400, $LBS_EXTENDEDSEL)
$ok = GUICtrlCreateButton("Start",80, 393, 70, 25, $BS_DEFPUSHBUTTON)
$cancel = GUICtrlCreateButton("Cancel",155,393, 70, 25)
GUISetState()

;Read list into GUI
_GUICtrlListBox_BeginUpdate($list)
While 1
    $line = FileReadLine($conffile)
    ;Stop at end of file
    If @error = -1 Then ExitLoop
    _GUICtrlListBox_AddString($list, $line)
WEnd
FileClose($conffile)
_GUICtrlListBox_EndUpdate($list)

[Melba23]

ChrisW,

A well-known trap for the unwary! As soon as you define a style for any control, you overwrite the default styles and have to add them back in if you still require them.

So as the default styles for _GUICtrlListBox_Create are: $LBS_SORT, $WS_HSCROLL, $WS_VSCROLL, $WS_BORDER, you will have to add any of those you want to your additional style using BitOR. It is important to use BitOR; simple addition works sometimes, but can lead to a lot of headscratching when it does not - and I speak from bitter experience!

So if you change your ListBox creation line to read:

$list = _GuiCtrlListBox_Create($hgui, "", 5, 5, 300, 400, BitOr($WS_VSCROLL, $LBS_EXTENDEDSEL))

you should find your scroll bar back again (I did when I tried it). >_<

M23

P.S. Welcome the Autoit forums, by the way!

Edited July 29, 2009 by Melba23

[Yashied]

I need to use the advanced function _GuiCtrlListBox_Create to create a list box which allows multiple selection. However, the control created in this way seems to lack a vertical scrollbar despite the fact that there are too many items to display. I'm creating the list empty, and then adding items with _GUICtrlListBox_AddString - maybe this doesn't trigger a check for whether a scrollbar is necessary after the latest addition? Is there a way to force this - I tried using the $LBS_DISABLENOSCROLL style but makes no difference?

$hgui = GUICreate("Title", 310, 425)
$list = _GuiCtrlListBox_Create($hgui, "", 5, 5, 300, 400, $LBS_EXTENDEDSEL)
$ok = GUICtrlCreateButton("Start",80, 393, 70, 25, $BS_DEFPUSHBUTTON)
$cancel = GUICtrlCreateButton("Cancel",155,393, 70, 25)
GUISetState()

;Read list into GUI
_GUICtrlListBox_BeginUpdate($list)
While 1
    $line = FileReadLine($conffile)
    ;Stop at end of file
    If @error = -1 Then ExitLoop
    _GUICtrlListBox_AddString($list, $line)
WEnd
FileClose($conffile)
_GUICtrlListBox_EndUpdate($list)

Preferred to use GUICtrlCreateListView().

[ChrisW]

Thanks M23 that's just what I was after.

Yashied thanks for the suggestion but I think a ListView is overkill here.