[issue34796] Tkinter scrollbar issues on Mac.

[Terry J. Reedy]

Terry J. Reedy  added the comment:

IDLE currently uses whatever 'ttk.Scrollbar' is. Unlike Windows, there are no 
top and bottom arrows, but this is also true with Safari, so I presume normal.

"Clicking trough near slider has no effect".  True for large file and small 
slider, not for medium file with large slider.

"Clicking top of slider treated as clicking on trough above slider.  True for 
about top 2 mm of the slider, when click and hold does not grab the slider.  If 
the slider is not at the top, it moves up.

So ttk slider becomes less useful as the file gets large, and only half usable 
at about 3000 lines and up.

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[issue34796] Tkinter scrollbar issues on Mac.

[Christopher A. Chavez]

Christopher A. Chavez  added the comment:

> Apparently, the current ttk.Scrollbar on the 8.6.8 we currently deliver 
> should sort of work.

I'm not sure if that is the case, though I have not tested with 8.6.8 (I do not 
currently have access to High Sierra or earlier). Based on a comment by the 
developer (Marc Culler) in https://core.tcl-lang.org/tk/tktview?name=0d63621b6c 
it sounds like the Ttk scrollbar is a completely new implementation for 8.6.10, 
whereas before (8.6.9.1? 8.6.8?) any code requesting a Ttk scrollbar on Aqua 
normally got a non-Ttk scrollbar instead.

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[issue34796] Tkinter scrollbar issues on Mac.

[Terry J. Reedy]

Terry J. Reedy  added the comment:

Christopher, I submitted before seeing your message.  Thank you for the 
additional info, which verifies that this is an upstream issue.  Apparently, 
the current ttk.Scrollbar on the 8.6.8 we currently deliver should sort of work.

--
resolution:  -> third party
stage: test needed -> resolved
status: open -> closed
versions: +Python 3.7, Python 3.8

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[issue34796] Tkinter scrollbar issues on Mac.

[Terry J. Reedy]

Terry J. Reedy  added the comment:

This should probably be closed as 3rd party, but someone needs to verify that 
the bug is in tk.  In the meanwhile, let it sit.

Vlad's test works perfectly on Windows with 8.6.9.  In multiple tries, mouse at 
(x, Y <= 16) is top arrow, (x, y >= 17) is slider.

--
nosy:  -ronaldoussoren
stage: needs patch -> test needed
versions: +Python 3.9 -Python 3.6, Python 3.7, Python 3.8

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[issue34796] Tkinter scrollbar issues on Mac.

[Ned Deily]

Ned Deily  added the comment:

As far as I recall, the scrollbar issue did seem to be fixed in 8.6.9.1 so that 
was one plus for updating.  But, as described in Issue35485, updating 
introduced other, far more serious new problems so we decided to revert to 
8.6.8 and wait for a new official release.

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[issue34796] Tkinter scrollbar issues on Mac.

[Christopher A. Chavez]

Christopher A. Chavez  added the comment:

I have not successfully reproduced the issue here with tkinter 3.7.3 using 
8.6.9.1 or recent core-8-6-branch on macOS Mojave.

I understand the reporter of this issue believed this was not an upstream Tk 
issue. However there's a recently opened upstream ticket relating to scrollbars 
on Aqua which may be of interest: 
https://core.tcl-lang.org/tk/info/8476b757811b3694

At the moment, one of the Tk Aqua developers appears to advise against using 
the normal (non-Ttk) scrollbar at all on macOS because it has never worked 
properly and likely will not be fixed, and instead suggests using the new Ttk 
scrollbar implementation, which should be available in 8.6.10.

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[issue34796] Tkinter scrollbar issues on Mac.

[Ned Deily]

Ned Deily  added the comment:

> Since then, there do not seem to have been any official releases of 8.6.9 so 
> we remain with 8.6.8

That is: there have been no official releases of Tk past 8.6.9.1 which was 
tried, along with the then current HEAD of the 8.6 maintenance branch, back in 
December.

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[issue34796] Tkinter scrollbar issues on Mac.

[Ned Deily]

Ned Deily  added the comment:

As far as I recall, we have only ever shipped 8.6.8 in final releases since we 
started providing a built-in Tcl/Tk in the python.org macOS installers as of 
3.7.0, 3.6.8, and 2.7.16 (https://www.python.org/download/mac/tcltk/).  There 
was the disastrous attempt to update to 8.6.9+ during the 3.7.2rc phase which 
we ultimately reverted prior to 3.7.2 final, as documented in Issue35485.  
Since then, there do not seem to have been any official releases of 8.6.9 so we 
remain with 8.6.8.  It would probably be a good thing for someone to work with 
the Tk folks on seeing whether the problems seen are being resolved but it's 
not something I expect to have time for in the foreseeable future.

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[issue34796] Tkinter scrollbar issues on Mac.

[Terry J. Reedy]

Terry J. Reedy  added the comment:

Ned, is the version of tcl/tk on Mac the same in 3.8.0b1 and upcoming 3.7.4 as 
it was last September?  (8.6.8 in 3.7.3, not sure in Sept.)

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[issue34796] Tkinter scrollbar issues on Mac.

[Christopher A. Chavez]

Change by Christopher A. Chavez :


--
nosy: +chrstphrchvz

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[issue34796] Tkinter scrollbar issues on Mac.

[Terry J. Reedy]

New submission from Terry J. Reedy :

#34047 was about scrollbar issues on MacOS in 3.7.0 and 3.6.6.  One was due to 
an IDLE bug, which was fixed on the issue.  Others, which can be demonstrated 
in the pure tkinter code below, are the subject of this issue.

1. Slider does not move properly when at top or bottom.
2. Clicking trough near slider at top or bottom has no effect.
See #34047 for more discussions and details.

Vlad Tudorache posted the code below as msg323349 of #34047 and attached as 
tktest.py, along with tkinter_scroll_issues.mov.
---

import tkinter

root = tkinter.Tk()

text = tkinter.Text(root)
vbar = tkinter.Scrollbar(root)

vbar.pack(side=tkinter.RIGHT, fill=tkinter.Y)
text.pack(side=tkinter.LEFT, fill=tkinter.BOTH, expand=1)

text.config(yscrollcommand=vbar.set)
vbar.config(command=text.yview)

lines = ['This is the line number %d.\n' % i for i in range(256)]
text.insert(tkinter.END, ''.join(lines))
 
def click_trace(event):
text.insert('%d.%d' % (1, 0), 'Clicked at (%d,%d) on %s.\n' % (event.x, 
event.y, vbar.identify(event.x, event.y)))

vbar.bind('', click_trace)

root.mainloop()
---

"Clicking at the top on the slider shows that the Scrollbar considers it as 
being on "through1" (in Tk the zone between the upper arrow and the "slider") 
and NOT on the "slider". Please, play with the script (python3 tktest.py) and 
see the results for yourselves."

--
components: Tkinter, macOS
messages: 326299
nosy: ned.deily, ronaldoussoren, serhiy.storchaka, terry.reedy, wordtech
priority: normal
severity: normal
stage: needs patch
status: open
title: Tkinter scrollbar issues on Mac.
type: behavior
versions: Python 3.6, Python 3.7, Python 3.8

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