Re: [MACTCL] Text Scroll Bar Tk 8.6.10

[Christopher C. <chr...@gm...>]

On 7/29/2020 1:02 PM, Kevan Hashemi wrote:
> Greetings,
>
> I'm running on MacOS Catalina 10.15.5. I have TclTk 8.6.10, compiled
> from sources. I execute the following to create a text window.
>
> catch {destroy .f}
> frame .f
> pack .f -side top -fill both
> text .f.text -relief sunken -border 2 -setgrid 1 -height 10 -width 20
> -wrap none
> .f.text configure -yscrollcommand ".f.vsb set"
> scrollbar .f.vsb -orient vertical -command ".f.text yview"
> pack .f.vsb -side right -fill y
> .f.text configure -xscrollcommand ".f.hsb set"
> scrollbar .f.hsb -orient horizontal -command ".f.text xview"
> pack .f.hsb -side bottom -fill x
> pack .f.text -expand yes -fill both
> for {set i 0} {$i <20} {incr i} {
>    .f.text insert end "$i\: This window should have scroll bars.\n" end
> }
>
> In TclTk 8.5, this works fine. In 8.6.10 it works fine on Windows and
> Linux it works fine. On MacOS 10.15 I get the text window, but the
> scroll bar buttons are invisible and the scrolling is unreliable.
> Sometimes the lines get garbled up as I scroll with the trackpad. The
> scroll bar buttons appear to be present, because if I click on one by
> luck, I can drag it up and down. I tried increasing the
> elementborderwidth and border of the scrollbars, but that did not make
> the buttons appear. On MacOS 10.13 I see the same problems.
>
> Is there some adjustment to the text or scrollbar widgets I need to make
> to get them to appear?
>
> Best, Kevan
>


Hello Kevan,

I personally suggest not posting to this mailing list due to the
likelihood that anything posted here won't get responded to. I suggest
instead posting to the comp.lang.tcl newsgroup, which is much more
active; just be sure to mention you're using macOS.

I tried your example with Tk 8.6.10 on macOS 10.15.6. Unfortunately I
don't believe I was able to reproduce the issues you describe: I don't
see text getting garbled, and the scrollbar "thumbs" are visible. The
only issue I do observe is that mousewheel/trackpad scrolling is
sometimes not reflected by the scrollbars
(https://core.tcl-lang.org/tk/tktview?name=06d8246ba -- which should be
addressed in the upcoming Tk 8.6.11 release).

You may want to post/link to screenshots or a screen recording of the
issues so that others might have a better guess of what is causing them.

You may also want to try ttk::scrollbar (new in Tk Aqua 8.6.10) instead
of the non-Ttk scrollbar. I recall some discussion not too long ago
where one of the Tk Aqua developers advised against using the non-Ttk
scrollbar on macOS due to its limitations, though I am not sure if that
is still the case.



Hope this helps

Christopher A. Chavez