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From: et99 <et99@rocketship1.me>
Newsgroups: comp.lang.tcl
Subject: Re: are canvas coordinates limited to 32k
Date: Mon, 14 Apr 2025 02:45:34 -0700
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Ah, I thought so Harald. You have read my mind, as that's exactly what I was trying to do.

I was testing some wiki code, at https://wiki.tcl-lang.org/page/A+scrolled+frame by Paul Walton (his sframe.tcl at the bottom) which worked quite well for a spreadsheet like tool to display some csv files with a matrix of entry widgets.

At least until I tried it on some large sample csv files I found at a csv site. It dies on the 1000 row files.

And thanks for the link to the ticket.

I begin to see why what to me has always seemed to be a missing piece of Tk, a -scrollable option for frames and toplevels.

I wonder how bwidgets and scrollutils handle large amounts of data. I have tried both but never with large amounts of data. It seems the answer is NOT to try to embed many thousands of entry widgets in a canvas.

Eric


On 4/13/2025 11:46 PM, Harald Oehlmann wrote:
> Am 14.04.2025 um 08:33 schrieb Harald Oehlmann:
>> Am 14.04.2025 um 05:44 schrieb et99:
>>> I've been experimenting with placing widgets inside a canvas. When I tried to test it's performance on lots of widgets (in a column) I am seeing the last few widgets not being displayed when the code does
>>>
>>> [winfo reqheight $content]
>>>
>>> where content is a frame and the value returned is over 32768 (actually starts failing just shy of that value).
>>>
>>> This naturally leads me to suspect there's a 16 bit issue here.
>>>
>>> I'm testing on windows 10, with 8.6 and 9.0 and get the same results.
>>>
>>>
>>
>> Unfortunately yes.
>>
>> This is very annoying, specially in a virtual canvas, where scrolling is used to display only a part.
>>
>> And the biggest point is, that if you exceed the size, there is no error, but display disruption, as widgets will be placed at negative coordinates etc.
>>
>> The last experience is on Windows...
>>
>> You have hit another swamp to clean-up...
>>
>> Sorry,
>> Harald
> 
> Tonts of Tk tickets on that:
> 
> https://core.tcl-lang.org/tk/tktview/3307625fff
> 
>