#!/usr/local/bin/perl -w
use Tk;
use Tk::WinPhoto;
use Cwd;

my $mw = MainWindow->new;
my $img = $mw->Photo();
my @fmt = grep(!/^window$/i,$img->formats);
my $frm  = $mw->Frame->pack;
$frm->Button(-text => 'Quit', -command => [destroy => $mw ])
    ->pack(-side => 'left');
my $b = $frm->Button(-text => 'Capture This', -command => \&Self)
    ->pack(-side => 'left');
my $grab = $frm->Label(-text => 'Grab',-relief => 'raised')->pack(-side => 'left');
$frm->Button(-text => 'Save', -command => \&Save)->pack(-side => 'left');
my $fmt  = $frm->Optionmenu(-variable => \$format,
                            -options => \@fmt)->pack(-side => 'left');
$grab->bind('<1>', \&GrabStart);
$grab->bind('<ButtonRelease-1>', [\&GrabWin,Ev('X'),Ev('Y')]);

print join(' ',$img->formats),"\n";

my $lab = $mw->Label(-image => $img)->pack;
MainLoop;

sub Save
{
 my $file = $mw->getSaveFile(-defaultextension => "\L$format",
                             -initialdir => getcwd());
 if (defined $file)
  {
   $img->write($file, -format => $format);
  }
}

sub GrabStart
{
 my $w = shift;
 $w->grabGlobal;
 $w->configure(-cursor => 'hand2', -relief => 'sunken');
}

sub Self
{
 my $id = hex($b->id);
 print "id = $id\n";
 $img->configure(-format => "Window", -data => $id);
}

sub GrabWin
{
 my ($w,$x,$y) = @_;
 $w->grabRelease;
 $w->configure(-cursor => undef, -relief => 'raised');
 my $id = $w->PointToWindow($x,$y);
 print "id = $id\n";
 $img->configure(-format => "Window", -data => $id);
}