Re: QT5 ListBox Problem

[Lee <t.lee.davidson@xxxxxxxxx>]

On 2/28/26 1:00 PM, Lee wrote:
> On 2/28/26 2:42 AM, Benoît Minisini wrote:
> > Le 28/02/2026 à 06:25, Lee a écrit :
> > > On 2/27/26 7:19 PM, Benoît Minisini wrote:
> > > > Le 27/02/2026 à 21:25, Lee a écrit :
> > > > > > Does the problem occur with the master branch?
> > > > >
> > > > > Yes, the issue persists on 3.21.99 409093b (master) with all three of those GUI toolkits.
> > > > >
> > > > > It occurs only if ListBox.ScrollBar is set to include Horizontal with either Scroll.Horizontal or Scroll.Both.
> > > >
> > > > I asked because I can't reproduce the problem. Can you send me a little project that shows the bug?
> > >
> > > I've discovered that the issue occurs if ListBox.Scrollbar is set to include Scroll.Horizontal *prior* to ListBox.List being 
> > > populated (which would include setting it via the IDE's property sheet). A project that shows the bug is very simple.
> > >
> > > Merely add a ListBox to a form, set its Scrollbar property to None so it can be controlled programmatically, and then use 
> > > just this code in FMain.class:
> > >
> > > [code]
> > > Public Sub Form_Open()
> > >
> > >      ' ListBox1.ScrollBar = Scroll.Both ' Setting it here causes the issue
> > >      ListBox1.List = ["One", "Two", "Three", "Four", "Five", "Six", "Seven", "Eight", "Nine", "Ten"]
> > >      ' ListBox1.ScrollBar = Scroll.Both ' Setting it here does not cause the issue
> > >
> > > End
> > > [/code]
> >
> > Thanks, it should be fixed in master now.
> >
> > Regards,
>
> Unfortunately, no, it is not fixed in version 3.21.99 cc76782 (master).
>
> I tried using ListBox1.Refresh after setting the List, but that didn't help.

I found that setting ListBox1.Wrap = True prior to populating the List causes the ListBox to behave as expected.

In the gb.gui.base source code for the UpdateLayout() subroutine: if $bWrap is true, line 230 sets $hView.AutoResize = True, 
else if the Scroll.Horizontal bit is set, line 238 sets $hView.AutoResize = False.

I commented out line 238 and recompiled with `make install`. That fixes it. But, I don't know what other issues that may cause.


--
Lee

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