Tkx::FindBar - Perl Tkx extension for an incremental search toolbar

   use Tkx;
   use Tkx::FindBar;

   my $mw      = Tkx::widget->new('.');
   my $text    = $mw->new_text();
   my $findbar = $mw->new_tkx_FindBar(-textwidget => $text);

   $text->g_pack();
   $findbar->g_pack();
   $findbar->hide();  # remove until requested by user

   # Bindings to display and hide toolbar and navigate matches.
   $findbar->add_bindings($mw,
      '<Control-f>'  => 'show',
      '<Escape>'     => 'hide',
      '<F3>'         => 'next',
      '<Control-F3>' => 'previous',
   );

   Tkx::MainLoop();

    perldoc Tkx::FindBar

package Tkx::FindBar;
use strict;
use warnings;
use Carp qw'carp';
use Tkx;
use base qw(Tkx::widget Tkx::MegaConfig);

our $VERSION = '0.09';

__PACKAGE__->_Mega("tkx_FindBar");
__PACKAGE__->_Config(
	-textwidget     => ['METHOD'],
	-highlightcolor => ['METHOD'],
);

my $initialized;
my $tile_available;

my %hidesub = (
	pack  => \&_hide_pack,
	grid  => \&_hide_grid,
	place => \&_hide_place,
);

my %showsub = (
	pack  => \&_show_pack,
	grid  => \&_show_grid,
	place => \&_show_place,
);

# Create aliases using the 'm_' prefix for public methods. Defining the 'm_*'
# names makes method delegation from other megawidgets work. Defining both
# names bypasses Tkx::widget::AUTOLOAD and any warnings about using an
# inherited AUTOLOAD.
*m_add_bindings = \&add_bindings;
*m_show         = \&show;
*m_hide         = \&hide;
*m_first        = \&first;
*m_next         = \&next;
*m_previous     = \&previous;

#-------------------------------------------------------------------------------
# Subroutine : _ClassInit
# Purpose    : Perform class initialization.
# Notes      :
#-------------------------------------------------------------------------------
sub _ClassInit {
	# determine availability of themed widgets
	$tile_available = eval { Tkx::package_require('tile') };

	# load images for toolbar buttons
	my $icofmt = eval { Tkx::package_require('img::png') } ? 'png' : 'gif89';

	while (<DATA>) {
		next if /^#/;
		next if /^\s*$/;
		last if /^__END__/;
		chomp;

		my ($name, $fmt, $data) = (split /:/)[0,1,4];
		next unless $fmt eq $icofmt;
		Tkx::image('create', 'photo', $name, -data => $data);
	}

	$initialized++;
}


#-------------------------------------------------------------------------------
# Method  : _Populate
# Purpose : Create a new FindBar
# Notes   :
#-------------------------------------------------------------------------------
sub _Populate {
	my $class  = shift;
	my $widget = shift;
	my $path   = shift;
	my %opt    = (-tile => 1, @_);

	_ClassInit() unless $initialized;

	# create the megawidget
	my $self = ($tile_available && $opt{-tile})
		? $class->new($path)->_parent->new_ttk__frame(-name => $path, -class => 'Tkx_FindBar')
		: $class->new($path)->_parent->new_frame(-name => $path, -class => 'Tkx_FindBar');
	$self->_class($class);

	# initialize instance data
	my $data = $self->_data();
	$data->{-tile}           = $tile_available && delete $opt{-tile};
	$data->{-textwidget}     = delete $opt{-textwidget};
	$data->{-highlightcolor} = delete $opt{-highlightcolor} || '#80FF80';
	$self->_set_hightlightcolor();

	$data->{start} = '1.0';  # start index of found string
	$data->{what}  = '';     # entry text
	$data->{case}  = 0;      # case-sensitive search
	$data->{regex} = 0;      # regular expression search
	$data->{count} = 0;      # number of chars in found string

	# populate the megawidget...

	$self->_button(
		-text      => 'Close',
		-image     => 'close16',
		-takefocus => 0,
		-command   => [\&hide, $self],
	)->g_pack(-side => 'left', -anchor => 'w');

	$self->_label(
		-name => 'lab',
		-text => 'Find:',
	)->g_pack(-side => 'left', -anchor => 'w');

	$self->_entry(
		-name            => 'e',
		-textvariable    => \$data->{what},
		-validate        => 'key',
		-validatecommand => [\&_find, Tkx::Ev('%P'), $self, 'first'],
	)->g_pack(-side => 'left', -anchor => 'w');

	$self->_button(
		-text      => 'Next',
		-image     => 'go-down16',
		-takefocus => 0,
		-command   => [\&next, $self],
	)->g_pack(-side => 'left', -anchor => 'w');

	$self->_button(
		-text      => 'Previous',
		-image     => 'go-up16',
		-takefocus => 0,
		-command   => [\&previous, $self],
	)->g_pack(-side => 'left', -anchor => 'w');

	$self->_checkbutton(
		-text      => 'Match Case',
		-underline => 6,
		-variable  => \$data->{case},
		-command   => [\&first, $self],
	)->g_pack(-side => 'left', -anchor => 'w');

	$self->_checkbutton(
		-text      => 'Regular Expression',
		-underline => 8,
		-variable  => \$data->{regex},
		-command   => [\&first, $self],
	)->g_pack(-side => 'left', -anchor => 'w');

	Tkx::bind("$self.e", '<Alt-c>', sub {
		$data->{case} = ! $data->{case};
		$self->first;
	});

	Tkx::bind("$self.e", '<Alt-e>', sub {
		$data->{regex} = ! $data->{regex};
		$self->first;
	});

	return $self;
}


#-------------------------------------------------------------------------------
# Subroutine : _button
# Purpose    : Create a button widget using the tile setting.
# Notes      :
#-------------------------------------------------------------------------------
sub _button {
	my $self = shift;

	return $self->_data->{-tile}
		? $self->new_ttk__button(-style => 'Toolbutton', @_)
		: $self->new_button(-relief => 'flat', @_);
}


#-------------------------------------------------------------------------------
# Subroutine : _label
# Purpose    : Create a label widget using the tile setting.
# Notes      :
#-------------------------------------------------------------------------------
sub _label {
	my $self = shift;
	return $self->_data->{-tile}
		? $self->new_ttk__label(@_)
		: $self->new_label(@_);
}


#-------------------------------------------------------------------------------
# Subroutine : _entry
# Purpose    : Create an entry widget using the tile setting.
# Notes      :
#-------------------------------------------------------------------------------
sub _entry {
	my $self = shift;
	return $self->_data->{-tile}
		? $self->new_ttk__entry(@_)
		: $self->new_entry(@_);
}


#-------------------------------------------------------------------------------
# Subroutine : _checkbutton
# Purpose    : Create a checkbutton widget using the tile setting.
# Notes      :
#-------------------------------------------------------------------------------
sub _checkbutton {
	my $self = shift;
	return $self->_data->{-tile}
		? $self->new_ttk__checkbutton(@_)
		: $self->new_checkbutton(@_);
}


#-------------------------------------------------------------------------------
# Method  : _config_textwidget
# Purpose : Handler for configure(-textwidget => <widget>)
# Notes   :
#-------------------------------------------------------------------------------
sub _config_textwidget {
	my $self = shift;
	my $text = shift;
	my $data = $self->_data();

	if (defined $text) {
		# Remove tag from previous text widget
		$data->{-textwidget}->tag('delete', 'highlight') if $data->{-textwidget};

		$data->{-textwidget} = $text;
		$self->_set_hightlightcolor();
	}

	return $data->{-textwidget};
}


#-------------------------------------------------------------------------------
# Method  : _config_highlightcolor
# Purpose : Handler for configure(-highlightcolor => <widget>)
# Notes   :
#-------------------------------------------------------------------------------
sub _config_highlightcolor {
	my $self  = shift;
	my $color = shift;
	my $data  = $self->_data();

	if (defined $color) {
		$data->{-highlightcolor} = $color;
		$self->_set_hightlightcolor();
	}

	return $data->{-highlightcolor};
}


#-------------------------------------------------------------------------------
# Method  : _set_hightlightcolor
# Purpose :
# Notes   :
#-------------------------------------------------------------------------------
sub _set_hightlightcolor {
	my $self = shift;
	my $data = $self->_data();

	return unless $data->{-textwidget};

	$data->{-textwidget}->tag('configure', 'highlight',
		-background => $data->{-highlightcolor},
	);
}


#-------------------------------------------------------------------------------
# Method  : _geometry_manager
# Purpose : Determine the geometry manager used to manage widget
# Notes   :
#-------------------------------------------------------------------------------
sub _geometry_manager {
	my $self = shift;

	eval { Tkx::pack('info',  $self) } and return 'pack';
	eval { Tkx::grid('info',  $self) } and return 'grid';
#	eval { Tkx::place('info', $self) } and return 'place';
	return;
}


#---------------------------------------------------------------------------
# Method  : show
# Purpose : Display the find toolbar
# Notes   :
#---------------------------------------------------------------------------
sub show {
	my $self = shift;
	my $data = $self->_data();

	# Display the find toolbar if it isn't already visible
	if ($data->{hidden}) {
		$showsub{$data->{gm}}->($self);
		$data->{hidden} = 0;
	}

	# Focus the entry widget and select the contents so the user can
	# start typing immediately
	Tkx::focus("$self.e");
	Tkx::eval("$self.e", 'selection', 'range', 0, 'end');

	$self->first();
}

sub _show_pack  { $_[0]->g_pack(Tkx::SplitList($_[0]->_data->{gminfo})) }
sub _show_grid  { $_[0]->g_grid() }
sub _show_place { }


#---------------------------------------------------------------------------
# Method  : hide
# Purpose : Hide the find toolbar
# Notes   :
#---------------------------------------------------------------------------
sub hide {
	my $self = shift;
	my $data = $self->_data();

	return if $data->{hidden};

	# Clear any lingering highlights from found text
	$data->{-textwidget}->tag('remove', 'highlight', '0.0', 'end')
		if defined $data->{-textwidget};

	my $gm = $self->_geometry_manager();

	return unless $gm;  # unsupported geometry manager!

	$data->{gm} = $gm;
	$hidesub{$gm}->($self);
	$data->{hidden} = 1;
}

sub _hide_pack {
	my $self = shift;
	my $data = $self->_data();

	# Remember currrent pack options
	$data->{gminfo} = Tkx::pack('info', $self);

	# Remember current place in pack order
	# pack('info', ...) doesn't include -before or -after so we need to
	# synthesize them using the slave list from our pack master.
	my ($master) = $data->{gminfo} =~ /-in (\.\w*)/;
	my @slave    = Tkx::SplitList(Tkx::pack('slaves', $master));
	for (my $i = 0; $i < @slave; $i++) {
		next unless $slave[$i] eq $self->_mpath;
		if    ($i > 0      ) { $data->{gminfo} .= " -after $slave[$i-1]"  }
		elsif ($i < $#slave) { $data->{gminfo} .= " -before $slave[$i+1]" }
		# else it's the only thing in the slaves!
		last;
	}

	Tkx::pack('forget', $self);
}

# grid remove remembers options for later redisplay :D
sub _hide_grid  { Tkx::grid('remove', $_[0]) }
sub _hide_place {}


#---------------------------------------------------------------------------
# Method  : first/next/previous
# Purpose : public wrappers for specific searches
# Notes   :
#---------------------------------------------------------------------------
sub first    { _find($_[0]->_data->{what}, $_[0], 'first') }
sub next     { _find($_[0]->_data->{what}, $_[0], 'next' ) }
sub previous { _find($_[0]->_data->{what}, $_[0], 'prev' ) }

#-------------------------------------------------------------------------------
# Method  : add_bindings
# Purpose : Sugar for bulk creation of bindings
# Notes   :
#-------------------------------------------------------------------------------
sub add_bindings {
	my $self    = shift;
	my $widget  = shift;
	my %binding = @_;

	while (my ($event, $method) = each %binding) {
		if (exists &$method) {
			Tkx::bind($widget, $event, sub { $self->$method });
		}
		else {
			my $class = ref $self;
			carp "Class '$class' does not have a method named '$method'";
		}
	}
}


#-------------------------------------------------------------------------------
# Subroutine : _find
# Purpose    : Search in text widget
# Notes      : Private sub, NOT A METHOD because the text must be the first arg
#              for Tkx::Ev to work when binding.
#-------------------------------------------------------------------------------
sub _find {
	my $what   = shift;                 # proposed text (Tcl %P)
	my $self   = shift;                 # megawidget instance
	my $which  = shift;                 # first|next|prev
	my $data   = $self->_data();        # instance data
	my $where  = $data->{-textwidget};  # where to search

	return 1 unless defined $where;

	# Restart new searches at the beginning. Advance the start position for
	# 'next' searches so we don't find the same text again.
	$data->{start}  = '1.0'       if $which eq 'first';
	$data->{start} .= '+ 1 chars' if $which eq 'next';

	# Build search options
	my @how = ('-count' => \$data->{count});
	push @how, '-backwards' if $which eq 'prev';
	push @how, '-regex'     if   $data->{regex};
	push @how, '-nocase'    if ! $data->{case};

	# Clear any results from the last search
	$where->tag('remove', 'highlight', '0.0', 'end');

	# Search for text
	# The eval{} is to catch exceptions caused by incomplete or invalid
	# regular expressions when the -regex option is used. Note that we can't
	# pre-check the regex because it's being evaluated by Tcl, not Perl, and
	# there are subtle syntax differences.
	my $i = eval { $where->search(@how, $what, $data->{start}) };

	if ($@) {
		# invalid regex (presumably)
		Tkx::eval("$self.e", 'configure', -foreground => 'red');
	}
	elsif ($i) {
		# text found / normal mode / no indication
		Tkx::eval("$self.e", 'configure', -foreground => 'black');

		# Highlight the match, scroll to it, and reset the start
		# position for finding the prev/next instance
		$where->tag('add', 'highlight', $i, "$i + $data->{count} chars");
		$where->see($i);
		$data->{start} = $i;
	}
	else {
		# text not found
		Tkx::eval("$self.e", 'configure', -foreground => '#808080');
	}

	# We only wanted to search, not prevent text entry.
	return 1;
}

1;

__DATA__
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__END__