Unable to resize embedded frame in perl/Tk

nikwasi has asked for the wisdom of the Perl Monks concerning the following question:

I am having issues with defining the width and height of the frame widget "$mini" in the following code. It is an embedded frame that is created to display an image when the grab() function is called. The frame is placed in a scrolling frame named "$frame2_1". When the frame is created it appears in the center of $frame2_1 with an inch padding(?) on both sides?

I would like to align the widget to the left side of the frame and resize to something else. However, configure(-width ##) does not work? I can move the widgets inside around using place() but nothing I do will increase/change the size of the frame $mini?

Please forgive me dumping the entire code here (~120 lines). It would be nice if I could display a picture of what the gui is doing.

#!/usr/bin/perl -w

use strict;
use Tk;
use Tk::WinPhoto;
use Tk::JPEG;

#Global variables
my $img_count = 0; #number of images displayed
my @mini; #array of frames created when image is grabbed

#Main window parameters
my $mw = MainWindow->new();
$mw->minsize(qw(670 510));
$mw->configure(-background=>'gray');
$mw->title("Screen Capture GUI");

my $but_capture = $mw->Button( -text => "Capture Screen", -command => 
+sub { \&Grab() } );
$but_capture -> place(-x=>10,-y=>5, -width=>650);

my $exit = $mw->Button( -text => "Exit", -command => sub { exit } );
$exit -> place(-x=>560,-y=>460, -width=>100);

my $frame2_1 = $mw->Scrolled('Frame',-scrollbars=> "e");
$frame2_1 -> place(-x=>10,-y=>50, -width=>650, -height=>400 );

MainLoop();

######################################################################
+####
######################################################################
+####

sub Grab(){

#Takes picture and makes thumbnail to display in mini frame
######################################################################
+####
#Creating file handle and taking picture
my $tim = time();
my $fname = "/tmp/".$tim.".jpg";
#print "$fname\n";
system("import -frame $fname");

#resize to display in window
my $fname2=$fname."sm.jpg";
system("convert -size 230X230 $fname -resize 230x230 $fname2");
######################################################################
+####

$img_count++;

#Frame packed in scrolling Frame
$mini[$img_count] = $frame2_1->Frame(-background=>'#3300ff'); 
$mini[$img_count] -> configure(-relief => 'groove', -borderwidth => 2)
+;
$mini[$img_count] ->pack();

#need to create new frame to hold contents
#stupid pack needs to create area to display things, this works but no
+t quite right?
my $dummy = $mini[$img_count]->Canvas();
$dummy -> create('rectangle', 0,0,500,300, -fill=>"black");
$dummy -> pack();

#items for mini frame
my $img_label = $mini[$img_count]->Label(-text=>"Image $img_count");
$img_label -> place(-x=>5,-y=>5);

my $pic_location = $mini[$img_count]->Label(-text=>"Pathname:");
$pic_location -> place(-x=>5,-y=>25 );

my $pic_fname = $mini[$img_count]->Entry(-width=>50,-textvariable=>"$f
+name");
$pic_fname -> place(-x=>70,-y=>25 );

my $pic = $mini[$img_count]->Photo( -file =>"$fname2");
my $f =$mini[$img_count]->Label(-image => $pic);
$f -> place(-x=>5,-y=>50 );

my $i = $img_count;
my $but_delete = $mini[$img_count] ->Button( -text => "Delete Image", 
+-command => sub { \&Delete($mini[$i], $i) } );
$but_delete -> place(-x=>5,-y=>240 );

my $blank1 = $frame2_1->Label(-text=>"");
$blank1 ->pack();

#Removes items from scrolling frame and replaces them with most recent
+ frame created at top
################################################
my $k = $img_count-1;
if($img_count>=2){
while($k!=0){
$mini[$k]->packForget;
$k--;
}
$k=$img_count;
while($k!=0){
$mini[$k]->pack();
$k--;
}
}
################################################
#print "i =$img_count :: mini is $mini[$img_count]\n";

} #close Grab()

######################################################################
+####
######################################################################
+####

sub Delete(){
my ($fn, $i) =@_;

#if only one image displayed
if ($img_count == 1){$fn ->destroy; $img_count--; return;}

#print "Image $i deleted is $fn\n";
$fn ->destroy;

#Deleted image now need to reorder array @mini[]
splice(@mini,$i,1);
$img_count--;
}
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Comment on Unable to resize embedded frame in perl/Tk Download Code

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Re: Unable to resize embedded frame in perl/Tk by zentara (Cardinal) on Mar 28, 2011 at 17:06 UTC
Hi, your script seems to work as described. It takes a sucession of Grab Screen's to lay in images in the scrolled Frame. I will mention that a Scrolled Pane is far preferable to a Scrolled Frame. I would switch to a scrolled Pane for your main container, before you go much further. Frames are very crude containers, and I don't know if they can be resized without a packForget and repack. What you might want to do limit the scrollregions, instead of attempting a resize, if that makes any sense to you. Here is a simple scrolled Pane example: #!/usr/bin/perl use strict; use Tk; use Tk::Pane; my $mw = MainWindow->new; $mw->geometry('400x250'); my $mwf = $mw->Scrolled('Pane', -scrollbars=>'osoe', -sticky=>'nwse', )->pack(-expand=>1, -fill=>'both'); my $f1 = $mwf->Frame()->pack(-expand=>1,-fill=>'both'); my $f2 = $mwf->Frame()->pack(-expand=>1,-fill=>'both'); my %canv; for (0..4){ $canv{$_}{'obj'} = $f1->Scrolled('Canvas', -height => 100, -width => 100, -bg =>'white', -scrollbars => 'osoe', -scrollregion => [ 0, 0, 500, 500 ], )->pack(-side =>'left' ,-padx=>10,-pady=>10, -expand=>1, -fill=>'bo +th'); $canv{$_}{'obj'}->createText(50,50, -text => $_, -anchor => 'center', ); } for (5..9){ $canv{$_}{'obj'} = $f2->Scrolled('Canvas', -height => 100, -width => 100, -bg =>'white', -scrollbars => 'osoe', -scrollregion => [ 0, 0, 500, 500 ], )->pack(-side =>'left', -padx=>10,-pady=>10 ,-expand=>1, -fill=>'bo +th'); $canv{$_}{'obj'}->createText(50,50, -text => $_, -anchor => 'center', ); } MainLoop(); [download] I'm not really a human, but I play one on earth. Old Perl Programmer Haiku ................... flash japh	[reply] [d/l]

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Re: Unable to resize embedded frame in perl/Tk
by zentara (Cardinal) on Mar 28, 2011 at 17:06 UTC

seems

I will mention that a Scrolled Pane is far preferable to a Scrolled Frame. I would switch to a scrolled Pane for your main container, before you go much further. Frames are very crude containers, and I don't know if they can be resized without a packForget and repack. What you might want to do limit the scrollregions, instead of attempting a resize, if that makes any sense to you.

Here is a simple scrolled Pane example:

#!/usr/bin/perl
use strict;
use Tk;
use Tk::Pane;

my $mw = MainWindow->new;

$mw->geometry('400x250');

my $mwf = $mw->Scrolled('Pane', 
               -scrollbars=>'osoe', 
           -sticky=>'nwse',
           )->pack(-expand=>1, -fill=>'both');

my $f1 = $mwf->Frame()->pack(-expand=>1,-fill=>'both');
my $f2 = $mwf->Frame()->pack(-expand=>1,-fill=>'both');

my %canv;

for (0..4){
  $canv{$_}{'obj'} = $f1->Scrolled('Canvas',
            -height => 100,
            -width => 100,
            -bg =>'white',
        -scrollbars => 'osoe',
        -scrollregion => [ 0, 0, 500, 500 ], 
   )->pack(-side =>'left' ,-padx=>10,-pady=>10, -expand=>1, -fill=>'bo
+th');

  $canv{$_}{'obj'}->createText(50,50,
    -text   => $_,
    -anchor => 'center',
    );
}

for (5..9){
  $canv{$_}{'obj'} = $f2->Scrolled('Canvas',
            -height => 100,
            -width => 100,
        -bg =>'white',
            -scrollbars => 'osoe',
        -scrollregion => [ 0, 0, 500, 500 ], 
   )->pack(-side =>'left', -padx=>10,-pady=>10 ,-expand=>1, -fill=>'bo
+th');

  $canv{$_}{'obj'}->createText(50,50,
    -text   => $_,
    -anchor => 'center',
    );

   

}

MainLoop();
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I'm not really a human, but I play one on earth.
Old Perl Programmer Haiku ................... flash japh

[reply]
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