package Tk::Spectrum;

use strict;
use warnings;
use Tk;
use Tk::PNG;
use Tk::DialogBox;
use Tk::Widget;
use Tk::LabFrame;

our $VERSION = '0.02';

Tk::Widget->Construct ('Spectrum');

sub new {
	my $proto = shift;
	my $mw = shift;
	my $class = ref($proto) || $proto || 'Tk::Spectrum';

	my $self = {
		mw => $mw,
		@_,
	};

	bless ($self,$class);
	return $self->Show;
}

sub Show {
	my ($args) = @_;

	# Args:
	# mw = parent window
	# -title        = Dialog title
	# -initialcolor = Initial/Default Color
	# -buttons      = [ 'Ok', 'Cancel' ]
	my $btnOkay = 'Ok';
	my $btnCancel = 'Cancel';
	my $initColor = exists $args->{'-initialcolor'} ? $args->{'-initialcolor'} : '#FFFFFF';
	$args->{selectedbtn} = '';
	$args->{selectedcolor} = $initColor;
	$args->{redval} = 0;
	$args->{grnval} = 0;
	$args->{bluval} = 0;
	$args->{hexval} = $initColor;
	my $presets = [
		# Two rows: 9 on top, 9 on bottom.
		[
			'#FFFFFF', # White
			'#CCCCCC', # Light Grey
			'#FF0000', # Red
			'#FF9900', # Orange
			'#FFFF00', # Yellow
			'#00FF00', # Lime Green
			'#00FFFF', # Cyan
			'#0000FF', # Blue
			'#FF00FF', # Magenta
			'#FF9999', # Pastel Red
			'#99FF99', # Pastel Green
		],
		[
			'#000000', # Black
			'#999999', # Dark Grey
			'#990000', # Dark Red
			'#996600', # Brown
			'#999900', # Gold
			'#009900', # Green
			'#009999', # Teal
			'#000099', # Dark Blue
			'#990099', # Purple
			'#9999FF', # Pastel Blue
			'#FFFF99', # Pastel Yellow
		],
	];
	if (exists $args->{'-preset'}) {
		$presets = [];
		foreach my $row (@{$args->{'-preset'}}) {
			if (defined $row && ref($row) eq 'ARRAY') {
				push (@{$presets}, $row);
			}
			else {
				warn "Invalid -preset syntax for Tk::Spectrum\n";
			}
		}
	}
	if (exists $args->{'-buttons'}) {
		if (scalar @{$args->{'-buttons'}} == 1) {
			$btnOkay = $args->{'-buttons'}->[0];
		}
		elsif (scalar @{$args->{'-buttons'}} >= 2) {
			$btnOkay = $args->{'-buttons'}->[0];
			$btnCancel = $args->{'-buttons'}->[1];
		}
	}

	my $win = $args->{mw}->Toplevel (
		-title   => $args->{'-title'} || 'Select Color',
	);
	$win->protocol ('WM_DELETE_WINDOW' => sub {
		$args->{selectedbtn} = $btnCancel;
	});
	$win->transient ($win->Parent->toplevel);
	$win->grab;

	# Divide up the main frames.
	my $btnFrame = $win->Frame->pack (-side => 'bottom', -fill => 'x');
	my $topFrame = $win->Frame->pack (-side => 'bottom', -fill => 'both', -expand => 1);
	my $leftFrame = $topFrame->Frame->pack (-side => 'left', -fill => 'y');
	my $rightFrame = $topFrame->Frame->pack (-side => 'left', -fill => 'both', -expand => 1);

	# Create the buttons.
	$btnFrame->Button (
		-text => $btnCancel,
		-command => sub {
			$args->{selectedbtn} = $btnCancel;
		},
	)->pack (-side => 'right', -padx => 5, -pady => 5);
	$btnFrame->Button (
		-text => $btnOkay,
		-command => sub {
			$args->{selectedbtn} = $btnOkay;
		},
	)->pack (-side => 'right', -padx => 5, -pady => 5);

	########################################################################
	## Left Frame (Spectrum and Preview Widgets)                          ##
	########################################################################

	# Create the spectrum viewer.
	my $specPhoto = $win->Photo (
		-data   => $args->getSpectrum,
		-format => 'PNG',
		-width  => 200,
		-height => 100,
	);
	my $specLabel = $leftFrame->Label (
		-borderwidth => 2,
		-relief      => 'sunken',
		-image       => $specPhoto,
	)->pack (-side => 'top', -pady => 10, -padx => 5);

	# Create the color preview objects.
	my $preFrame = $leftFrame->Frame (
		-borderwidth => 1,
		-relief      => 'sunken',
		-width       => 102,
		-height      => 25,
	)->pack (-side => 'top');
	my $curColor = $preFrame->Frame (
		-background => $initColor,
		-width      => 50,
		-height     => 25,
	)->pack (-side => 'left');
	$preFrame->Frame (
		-borderwidth => 1,
		-relief      => 'raised',
		-width       => 2,
		-height      => 25,
	)->pack (-side => 'left');
	my $firstColor = $preFrame->Frame (
		-background => $initColor,
		-width      => 50,
		-height     => 25,
	)->pack (-side => 'left');

	# Bind mouse clicks on the spectrum.
	my $clicking = 0;
	$specLabel->bind ('<Button-1>', sub {
		my $x = $Tk::event->x;
		my $y = $Tk::event->y;
		$clicking = 1;

		if ($x < 200 && $y < 100 && $x > 0 && $y > 0) {
			my $color = $specPhoto->get ($x,$y);
			my $hex = $args->getHex($color);
			$curColor->configure (-background => $hex);
			$args->{selectedcolor} = $hex;
			$args->hexToRGB($hex);
		}
	});
	$specLabel->bind ('<Motion>', sub {
		if ($clicking) {
			my $x = $Tk::event->x;
			my $y = $Tk::event->y;

			my $hex = '';
			if ($y < 0) {
				$hex = '#ffffff';
			}
			elsif ($y > 100) {
				$hex = '#000000';
			}
			elsif ($x < 0 || $x > 200) {
				$hex = '#ff0000';
			}

			if (length $hex == 0) {
				if ($x < 200 && $y < 100 && $x > 0 && $y > 0) {
					my $color = $specPhoto->get ($x,$y);
					$hex = $args->getHex($color);
				}
			}

			if (length $hex) {
				$curColor->configure (-background => $hex);
				$args->{selectedcolor} = $hex;
				$args->hexToRGB($hex);
			}
		}
	});
	$specLabel->bind ('<ButtonRelease-1>', sub {
		$clicking = 0;
	});
	$firstColor->bind ('<Button-1>', sub {
		$curColor->configure (-background => $initColor);
		$args->{selectedcolor} = $initColor;
		$args->hexToRGB($initColor);
	});

	########################################################################
	## Right Frame (Text Boxes)                                           ##
	########################################################################

	my $labValues = $rightFrame->LabFrame (
		-label     => 'Values',
		-labelside => 'acrosstop',
	)->pack (-side => 'top', -fill => 'x', -padx => 5);

	$labValues->Label (
		-text => 'Red:',
	)->grid (-column => 0, -row => 0);
	my $txtRed = $labValues->Entry (
		-textvariable => \$args->{redval},
		-width        => 3,
	)->grid (-column => 1, -row => 0);
	$labValues->Label (
		-text => 'Green:',
	)->grid (-column => 2, -row => 0);
	my $txtGrn = $labValues->Entry (
		-textvariable => \$args->{grnval},
		-width        => 3,
	)->grid (-column => 3, -row => 0);
	$labValues->Label (
		-text => 'Blue:',
	)->grid (-column => 4, -row => 0);
	my $txtBlu = $labValues->Entry (
		-textvariable => \$args->{bluval},
		-width        => 3,
	)->grid (-column => 5, -row => 0);

	# Bind the return keys for these entries.
	$txtRed->bind ('<Return>', sub {
		my $hex = $args->getHex ([
			$args->{redval},
			$args->{grnval},
			$args->{bluval},
		]);
		$curColor->configure (-background => $hex);
		$args->{selectedcolor} = $hex;
		$args->hexToRGB($hex);
	});
	$txtGrn->bind ('<Return>', sub {
		my $hex = $args->getHex ([
			$args->{redval},
			$args->{grnval},
			$args->{bluval},
		]);
		$curColor->configure (-background => $hex);
		$args->{selectedcolor} = $hex;
		$args->hexToRGB($hex);
	});
	$txtBlu->bind ('<Return>', sub {
		my $hex = $args->getHex ([
			$args->{redval},
			$args->{grnval},
			$args->{bluval},
		]);
		$curColor->configure (-background => $hex);
		$args->{selectedcolor} = $hex;
		$args->hexToRGB($hex);
	});

	$labValues->Label (
		-text => 'Hex:',
	)->grid (-column => 0, -row => 1);
	my $txtHex = $labValues->Entry (
		-textvariable => \$args->{hexval},
	)->grid (-column => 1, -row => 1, -columnspan => 5, -sticky => 'ew');
	$txtHex->bind ('<Return>', sub {
		my $valid = 1;
		if (length $args->{hexval} > 7 || length $args->{hexval} < 6) {
			$valid = 0;
		}
		if ($args->{hexval} =~ /[^A-Fa-f0-9\#]/) {
			$valid = 0;
		}

		if ($valid) {
			$args->{hexval} = '#' . $args->{hexval} unless $args->{hexval} =~ /^#/;
			$curColor->configure (-background => $args->{hexval});
			$args->{selectedcolor} = $args->{hexval};
			$args->hexToRGB($args->{hexval});
		}
	});

	my $labPreset = $rightFrame->LabFrame (
		-label     => 'Preset Colors',
		-labelside => 'acrosstop',
	)->pack (-side => 'top', -fill => 'x', -padx => 5);

	my $y = 0;
	foreach my $row (@{$presets}) {
		my $x = 0;
		foreach my $color (@{$row}) {
			my $pre = $labPreset->Frame (
				-background  => $color,
				-borderwidth => 1,
				-relief      => 'sunken',
				-width       => 19,
				-height      => 19,
			)->grid (-column => $x, -row => $y);
			$pre->bind ('<Button-1>', sub {
				$curColor->configure (-background => $color);
				$args->{selectedcolor} = $color;
				$args->hexToRGB($color);
			});
			$x++;
		}
		$y++;
	}

	# Load the data for the initial color.
	$args->hexToRGB($initColor);

	$win->waitVariable (\$args->{selectedbtn});
	$win->destroy;

	if ($args->{selectedbtn} eq $btnOkay) {
		return $args->{selectedcolor};
	}
	else {
		return $initColor;
	}
}

sub getHex {
	my ($self,$color) = @_;

	for (my $i = 0; $i < 3; $i++) {
		if ($color->[$i] =~ /[^0-9]/) {
			$color->[$i] = 0;
		}
		if ($color->[$i] < 0) {
			$color->[$i] = 0;
		}
		elsif ($color->[$i] > 255) {
			$color->[$i] = 255;
		}
	}

	my $red = sprintf("%x",$color->[0]);
	my $grn = sprintf("%x",$color->[1]);
	my $blu = sprintf("%x",$color->[2]);

	$red = '0' . $red until length $red == 2;
	$grn = '0' . $grn until length $grn == 2;
	$blu = '0' . $blu until length $blu == 2;

	return '#' . join("",$red,$grn,$blu);
}

sub hexToRGB {
	my ($self,$hex) = @_;

	$hex =~ s/^#//g;

	my ($r,$g,$b) = $hex =~ /^(..)(..)(..)$/;
	my $red = oct("0x$r");
	my $grn = oct("0x$g");
	my $blu = oct("0x$b");

	$self->{redval} = $red;
	$self->{grnval} = $grn;
	$self->{bluval} = $blu;
	$self->{hexval} = '#' . $hex;
}

sub getSpectrum {
	return qq~iVBORw0KGgoAAAANSUhEUgAAAMgAAABkCAIAAABM5OhcAAAABGdBTUEAAK/INwWK6QAAABl0RVh0
U29mdHdhcmUAQWRvYmUgSW1hZ2VSZWFkeXHJZTwAACvxSURBVHjaYvz//z/DKBgF1AYAAcQ0GgSj
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s35/B8YJAa8b/QCDmqjvBa9gfshNHwegu0DSuDUd5zQrXpl+4QiDajTAWK/8X5QFm6HEfsdApTIF
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~;
}

1;
__END__

=head1 NAME

Tk::Spectrum - A stylish color selection dialog.

=head1 SYNOPSIS

  use Tk::Spectrum;

  my $color = $mw->Spectrum (
    -title        => 'Pick a Color',
    -initialcolor => '#000000',
    -buttons      => [ 'Ok', 'Cancel' ],
    -preset       => [ $preset_colors ],
  );

  print "You chose $color\n";

=head1 DESCRIPTION

Tk::Spectrum is a stylish color selection dialog. It presents the user with
a full color spectrum with which they can click and drag to select colors,
as well as a form where they can select RGB and Hexadecimal color values. It
also supports a "preset color list" similar to the Win32 native color dialog
box. The program can define which colors go into this list.

B<Note:> This module only knows how to deal with hexadecimal numbers. It's
impossible from the end user's side to enter a non-hex value, but if your
program uses colors by name and you try to use named colors in Tk::Spectrum,
it will cause errors.

=head1 OPTIONS

The options supported by Tk::Spectrum are as follows:

=over 4

=item -title

Specifies the title of the dialog box. The default is "Select Color".

=item -initialcolor

Define the initial/default color for the dialog box. If the user hits Cancel,
the initial color is returned.

=item -buttons

Specify the labels for one or both of the buttons on the dialog box. If only one
label is given, it's used on the "Ok" button. If two are given, they're used
on "Ok" and "Cancel", respectively. The default values are "Ok" and "Cancel".

=item -preset

Define a preset color scheme. This takes a number of array references, one array
representing each row of colors to use. The default range of preset colors are
suitable for almost all situations. If your program really needs to override
the presets, you can do so.

  -preset => [
    # Row 1
    [ '#FF0000', '#00FF00', '#0000FF' ],
    # Row 2
    [ '#990000', '#009900', '#000099' ],
  ],

You can have virtually as many rows and columns as you need, but keep in mind
that the dialog window size may grow to accomodate.

=head1 CHANGES

  Version 0.02
  - Added dependency on Tk and Tk::PNG to Makefile.PL to stop CPAN's nagging

  Version 0.01
  - Initial release

=head1 AUTHOR

Casey Kirsle

This module is distributed under the same terms as Perl itself.

=cut