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Re: Dynamic re-pack widget

by thundergnat (Deacon)
on Dec 05, 2012 at 19:10 UTC ( #1007366=note: print w/replies, xml ) Need Help??

in reply to Dynamic re-pack widget

Since you don't show any code, it is difficult to point out where you might need to make changes to accomplish your goal. That being said... I don't think your issue is the form geometry manager particularly. If it works as you expect when you use the slider to adjust it, then it should also work if you set it using the built in $scale->set() method. That will fire any attached command routines. See demo below. Note that the tied variable $w{size} holds the value of the scale. If you change $w{size} directly, it won't fire the command. You need to use $w{scale}->set.

use warnings; use strict; use Tk; my %w; $w{size} = 90; $w{mw} = MainWindow->new; $w{mw}->Label( -text => 'Let it snow!' )->pack; $w{frame} = $w{mw}->Frame(-borderwidth => 10)->pack; $w{scale} = $w{frame}->Scale(qw/-orient vertical -length 284 -from 120 + -to 10 /, -command => sub { $w{label}->configure( -font => "{Arial} $w{size} +") }, -variable => \$w{size} )->pack(-side =>'left'); $w{label} = $w{frame}->Label( -text => "\x{2603}", -font => "{Arial} $w{size}" )->pack(-side =>'right'); $w{frame}->Button( -text => "${_}pt.", -width => 4, -command => [ sub { $w{scale}->set($_[0]) }, $_ ] )->pack() for qw/20 40 60 80 120/; MainLoop;

For a contrast, change the button command to:

[ sub { $w{size} = $_[0] }, $_ ]

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LanX (for people wondering: yes field hockey still exists and is even more popular than Hasslhoff in Germany)
[Corion]: LanX: Ah, that explains a lot :)
[marto]: Nobody we spoke to in Berlin had a clue who Hasslhoff was
[erix]: heh: The Dutch do one thing very, very well
[LanX]: the sidekick of this blonde playboy model which was saving lives with her red bathing suit ... (what was her name again ...)
[choroba]: Pamela Anderson?
[choroba]: erix: I'm proud to be from a nation that also does one thing well
[LanX]: ah yes! And he called her Kit and she could talk while a light was going from her left to right eye and back...
[erix]: choroba: pretty impressive! :)
LanX imagines which nations would be dominating if the winter olympics were invented in East Asia

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