• Re: Re: Functions and Tk
• Re: Tk event examples?

I used the sub program way because I have the sub window do some functions before closing so I cannot call close right in the declerative region for the button. However I have a problem getting the window to close multiple times. It works fine the first time but when I call the window again it opens and then when I execute the function it errors while trying to close the second time.

sub go_to {
   my $sw = $mw->Toplevel(-title=>"Go To Line");
   my $frame = $sw->Frame->pack(-side => 'top', -fill => 'x');
   $frame->Label(-text => "Enter Line Number:")->pack(-side => 'left',
+ -anchor => 'w');
   $frame->Entry(-textvariable => \$line_number)->
      pack(-side => 'left', -anchor => 'w', -fill => 'x', -expand => 1
+);
   $frame->Button(-text => "GO", -background => 'navy blue', -foregrou
+nd => 'white', -command =>\&scroll_line)->
      pack(-side => 'right');

   sub scroll_line {
      $line_number = $line_number - 1;
      my $calc = $line_number/$line_count;
      $t->yviewMoveto($calc);
      $line_number = $line_number + 1;
      $sw->destroy();
   }
}
[download]

As you might be able to tell the sub window is a "go to" line function in a text editor script I am writing and needs to be opened and closed multiple time during one session. How can I change it to do this more than once successfully. The error is:

Tk::Error: Usage $widget->destroy(...) at C:\Documents and Settings\My_Name\My Documents\scripts\perl_edit.pl line 343. \&main::scroll_line Tk callback for .toplevel.frame.button Tk::__ANON__ at C:/Perl/site/lib/Tk.pm line 228 Tk::Button::butUp at C:/Perl/site/lib/Tk/Button.pm line 111 (command bound to event) destroy (1): 0 0x1a6dfe4 RV f=00080503 {}(1)(1) SV = RV(0x2104260) at 0x1a6dfe4 REFCNT = 1 FLAGS = (PADBUSY,PADMY,ROK) RV = 0x2145d78

Whats the solution for this ??? Could you share, if you have figured it out... i know its a long time since this post! But i am working on something similar and have the same issue!

This can be made much simpler, by using Tk::Dialog.

use Tk;
use Tk::Dialog;
use strict;
use warnings;

my $top = new MainWindow(-title => "demo");    
my $save = $top->Button(-text => "Close", command => \&process_save)->
+pack();
MainLoop;

sub process_save {
    my $dialog = $top->Dialog(-title => "Save?", -text =>  "Content ch
+anged, save the changes?", -buttons => ["OK", "Cancel"]);#in real wor
+ld, you only display this, if the content changed
    my $response = $dialog->Show();
    print $response, "\n" #in real code, handle the response...
}
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I am not sure dialog will work for this. I need to be able to have a blank text field to enter in a line number and then perform the scroll function. It does not appear that a dialog box allows for text insertion. Am I wrong in thinking this way? If so how would I accomplish this. I read the docs on the module and saw no option for this functionality.

If that's what you want, then go with Tk::DialogBox, which allows you to add sub-widget. Here is a piece of demo:

use Tk;
use Tk::DialogBox;
use strict;
use warnings;

my $top = new MainWindow(-title => "demo");    
my $save = $top->Button(-text => "Goto line", command => \&process_sav
+e)->pack();
my $line_num;
MainLoop;

sub process_save {
    my $dialog = $top->DialogBox(-title => "Save?", -buttons => ["OK",
+ "Cancel"]);
    $dialog->add("Entry", -text => \$line_num)->pack();
    my $response = $dialog->Show();
    print "[$response, $line_num]\n" #in real code, handle the respons
+e...
}
[download]