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devel / comp.lang.tcl / Text widget

SubjectAuthor
* Text widgetsnosniv
`* Text widgetRich
 `- Text widgetsnosniv

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Text widget

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Subject: Text widget
From: nivpars...@gmail.com (snosniv)
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 by: snosniv - Mon, 19 Dec 2022 21:35 UTC

Is it possible to make a text widget scroll when lines of text reach the bottom of the window?
At the moment, I can display 10 lines of text, but lines 11 & beyond are off the window bottom, although I can scroll down with the mouse, I'd prefer if it'd auto scroll as each extra line was added.

This is a sample of adding one line of text, which is short, all lines about 30 chars max & fit a line easily:

$f7.txt00 configure -state normal
$f7.txt00 insert insert "$blk_cnt:- <'simple text to output'>\n"
$f7.txt00 configure -state disabled
incr blk_cnt

TIA, Kev P.

Re: Text widget

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Newsgroups: comp.lang.tcl
Subject: Re: Text widget
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 by: Rich - Mon, 19 Dec 2022 22:09 UTC

snosniv <nivparsons@gmail.com> wrote:
> Is it possible to make a text widget scroll when lines of text reach the bottom of the window?
> At the moment, I can display 10 lines of text, but lines 11 & beyond are off the window bottom, although I can scroll down with the mouse, I'd prefer if it'd auto scroll as each extra line was added.
>
> This is a sample of adding one line of text, which is short, all lines about 30 chars max & fit a line easily:
>
> $f7.txt00 configure -state normal
> $f7.txt00 insert insert "$blk_cnt:- <'simple text to output'>\n"
> $f7.txt00 configure -state disabled
> incr blk_cnt
>
> TIA, Kev P.

What you are looking for is the "see" sub-command to the text widget.
With the 'end' index.

If you want the widget to always show the last line added then:

$text insert end "new line of text\n"
$text see end

Note that 'end' there is a text index, so other valid indexes are also
possible, to move the view to show that index within the widget.

Re: Text widget

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Subject: Re: Text widget
From: nivpars...@gmail.com (snosniv)
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 by: snosniv - Tue, 20 Dec 2022 17:03 UTC

On Monday, 19 December 2022 at 22:09:06 UTC, Rich wrote:
> snosniv <nivpa...@gmail.com> wrote:
> > Is it possible to make a text widget scroll when lines of text reach the bottom of the window?
> > At the moment, I can display 10 lines of text, but lines 11 & beyond are off the window bottom, although I can scroll down with the mouse, I'd prefer if it'd auto scroll as each extra line was added.
> >
> > This is a sample of adding one line of text, which is short, all lines about 30 chars max & fit a line easily:
> >
> > $f7.txt00 configure -state normal
> > $f7.txt00 insert insert "$blk_cnt:- <'simple text to output'>\n"
> > $f7.txt00 configure -state disabled
> > incr blk_cnt
> >
> > TIA, Kev P.
> What you are looking for is the "see" sub-command to the text widget.
> With the 'end' index.
>
> If you want the widget to always show the last line added then:
>
> $text insert end "new line of text\n"
> $text see end
>
> Note that 'end' there is a text index, so other valid indexes are also
> possible, to move the view to show that index within the widget.

Worked nicely, thank you. (Simple when you know how)! :-)

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