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# You may distribute under the terms of either the GNU General Public License
# or the Artistic License (the same terms as Perl itself)
#
# (C) Paul Evans, 2011-2017 -- leonerd@leonerd.org.uk
package Tickit::Widget::Scroller::Item::Text;
use strict;
use warnings;
our $VERSION = '0.23';
use Tickit::Utils qw( textwidth cols2chars );
=head1 NAME
C<Tickit::Widget::Scroller::Item::Text> - add static text to a Scroller
=head1 SYNOPSIS
use Tickit::Widget::Scroller;
use Tickit::Widget::Scroller::Item::Text;
my $scroller = Tickit::Widget::Scroller->new;
$scroller->push(
Tickit::Widget::Scroller::Item::Text->new( "Hello world" )
);
=head1 DESCRIPTION
This implementation of L<Tickit::Widget::Scroller::Item> displays a simple
static piece of text. It will be wrapped on whitespace (characters matching
the C</\s/> regexp pattern).
=cut
=head1 CONSTRUCTOR
=cut
=head2 new
$item = Tickit::Widget::Scroller::Item::Text->new( $text, %opts )
Constructs a new text item, containing the given string of text. Once
constructed, the item is immutable.
The following options are recognised in C<%opts>:
=over 4
=item indent => INT
If the text item needs to wrap, indent the second and subsequent lines by this
amount. Does not apply to the first line.
=back
=cut
sub new
{
my $class = shift;
my ( $text, %opts ) = @_;
my $self = bless {
lineruns => [],
}, $class;
$self->{indent} = $opts{indent} if defined $opts{indent};
$self->{chunks} = [ $self->_build_chunks_for( $text ) ];
return $self;
}
=head1 METHODS
=cut
=head2 chunks
@chunks = $item->chunks
Returns the chunks of text displayed by this item. Each chunk is represented
by an ARRAY reference of three fields, giving the text string, its width in
columns, and various options
[ $text, $width, %opts ]
Recognised options are:
=over 8
=item pen => Tickit::Pen
Pen to render the chunk with.
=item linebreak => BOOL
If true, force a linebreak after this chunk; the next one starts on the
following line.
=back
=cut
sub _build_chunks_for
{
my $self = shift;
my ( $text ) = @_;
my @lines = split m/\n/, $text, -1;
my $lastline = pop @lines;
return ( map { [ $_, textwidth( $_ ), linebreak => 1 ] } @lines ),
[ $lastline, textwidth( $lastline ) ];
}
sub chunks
{
my $self = shift;
return @{ $self->{chunks} };
}
sub height_for_width
{
my $self = shift;
my ( $width ) = @_;
$self->{width} = $width;
my @chunks = $self->chunks;
$self->{lineruns} = \my @lineruns;
push @lineruns, my $thisline = [];
my $line_remaining = $width;
while( @chunks ) {
my $chunk = shift @chunks;
my ( $text, $textwidth, %opts ) = @$chunk;
if( $textwidth <= $line_remaining ) {
push @$thisline, [ $text, $textwidth, $opts{pen} ];
$line_remaining -= $textwidth;
}
else {
# Split this chunk at most $line_remaining chars
my $eol_ch = cols2chars $text, $line_remaining;
if( $eol_ch < length $text && substr( $text, $eol_ch, 1 ) =~ m/\S/ ) {
# TODO: This surely must be possible without substr()ing a temporary
if( substr( $text, 0, $eol_ch ) =~ m/\S+$/ and
( $-[0] > 0 or @$thisline ) ) {
$eol_ch = $-[0];
}
}
my $partial_text = substr( $text, 0, $eol_ch );
my $partial_chunk = [ $partial_text, textwidth( $partial_text ), $opts{pen} ];
push @$thisline, $partial_chunk;
my $bol_ch = pos $text = $eol_ch;
$text =~ m/\G\s+/g and $bol_ch = $+[0];
my $remaining_text = substr( $text, $bol_ch );
my $remaining_chunk = [ $remaining_text, textwidth( $remaining_text ), %opts ];
unshift @chunks, $remaining_chunk;
$line_remaining = 0;
}
if( ( $line_remaining == 0 or $opts{linebreak} ) and @chunks ) {
push @lineruns, $thisline = [];
$line_remaining = $width - ( $self->{indent} || 0 );
}
}
return scalar @lineruns;
}
sub render
{
my $self = shift;
my ( $rb, %args ) = @_;
my $cols = $args{width};
# Rechunk if width changed
$self->height_for_width( $cols ) if $cols != $self->{width};
my $lineruns = $self->{lineruns};
foreach my $lineidx ( $args{firstline} .. $args{lastline} ) {
my $indent = ( $lineidx && $self->{indent} ) ? $self->{indent} : 0;
$rb->goto( $lineidx, 0 );
$rb->erase( $indent ) if $indent;
foreach my $chunk ( @{ $lineruns->[$lineidx] } ) {
my ( $text, $width, $chunkpen ) = @$chunk;
$rb->text( $text, $chunkpen );
}
$rb->erase_to( $cols );
}
}
=head1 AUTHOR
Paul Evans <leonerd@leonerd.org.uk>
=cut
0x55AA;
|
