/usr/share/perl5/Layout/Manager/Flow.pm is in liblayout-manager-perl 0.34-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 | package Layout::Manager::Flow;
use Moose;
extends 'Layout::Manager';
use Moose::Util::TypeConstraints;
enum 'Layout::Manager::Flow::Anchors' => qw(north south east west);
has 'anchor' => (
is => 'rw',
isa => 'Layout::Manager::Flow::Anchors',
default => sub { 'north' }
);
has 'expand' => (
is => 'rw',
isa => 'Bool',
default => sub { 1 }
);
has 'used' => (
is => 'rw',
isa => 'ArrayRef',
default => sub { [0, 0] }
);
has 'wrap' => (
is => 'rw',
isa => 'Bool',
default => sub { 0 }
);
override('do_layout', sub {
my ($self, $container) = @_;
my $bbox = $container->inside_bounding_box;
my $cwidth = $bbox->width;
my $cheight = $bbox->height;
my $ox = $bbox->origin->x;
my $oy = $bbox->origin->y;
my $anch = $self->anchor;
my @lines;
my $yused = $oy;
my $xused = $ox;
my $line = 0;
foreach my $comp (@{ $container->components }) {
next unless defined($comp) && $comp->visible;
$comp->width($comp->minimum_width);
$comp->height($comp->minimum_height);
# If we aren't wrapping, expand to fill the whole space
if(($anch eq 'north') || ($anch eq 'south')) {
unless($self->wrap) {
$comp->width($cwidth) if $cwidth;
}
} else {
unless($self->wrap) {
$comp->height($cheight) if $cheight;
}
}
my $comp_height = $comp->height;
my $comp_width = $comp->width;
unless(defined($lines[$line])) {
$lines[$line] = {
tallest => $comp_height || 0,
widest => $comp_width || 0,
height => 0,
width => 0,
components => []
};
}
# Keep up with the tallest component we find
if(!($lines[$line]->{tallest}) || $comp_height > $lines[$line]->{tallest}) {
$lines[$line]->{tallest} = $comp_height;
}
# Keep up with the widest component we find
if(!($lines[$line]->{widest}) || $comp_width > $lines[$line]->{widest}) {
$lines[$line]->{widest} = $comp_width;
}
my $co = $comp->origin;
if($anch eq 'north') {
# No wrapping
$co->x($ox);
$co->y($oy + $lines[$line]->{height});
$lines[$line]->{height} += $comp_height;
unless($lines[$line]->{width}) {
$lines[$line]->{width} = $comp_width;
}
} elsif($anch eq 'south') {
# No wrapping
$co->x($ox);
$co->y($oy + $cheight - $comp_height - $lines[$line]->{height});
$lines[$line]->{height} += $comp_height;
unless($lines[$line]->{width}) {
$lines[$line]->{width} = $comp_width;
}
} elsif($anch eq 'east') {
if(
# It doesn't matter if we are supposed to wrap if we have
# no width, we'll make this thing as big as it needs to be
($cwidth > 0) &&
# if we are wrapping
($self->wrap) &&
# and the current component would overflow...
($lines[$line]->{width} + $comp_width > $cwidth) &&
scalar(@{ $lines[$line]->{components} })
) {
# We've been asked to wrap and this component is too wide
# to fit. Move down by the height of the tallest component
# then reset the tallest variable.
$yused += $lines[$line]->{tallest};
$co->x($cwidth - $comp_width - $ox);
$co->y($oy + $yused);
$line++;
$lines[$line]->{width} = $ox + $comp_width;
$lines[$line]->{tallest} = $comp_height;
} else {
$co->x($ox + $cwidth - $comp_width - $lines[$line]->{width});
$co->y($yused);
$lines[$line]->{width} += $comp_width;
}
} else {
# WEST
if(
# It doesn't matter if we are supposed to wrap if we have
# no width, we'll make this thing as big as it needs to be
($cwidth > 0) &&
# if we are wrapping
($self->wrap) &&
# and the current component would overflow...
($lines[$line]->{width} + $comp_width > $cwidth) &&
scalar(@{ $lines[$line]->{components} })
) {
# We've been asked to wrap and this component is too wide
# to fit. Move down by the height of the tallest component
# then reset the tallest variable.
$yused += $lines[$line]->{tallest};
$co->x($ox);
$co->y($yused);
$line++;
$lines[$line]->{width} = $ox + $comp_width;
$lines[$line]->{tallest} = $comp_height;
} else {
$co->x($ox + $lines[$line]->{width});
$co->y($yused);
$lines[$line]->{width} += $comp_width;
}
}
push(@{ $lines[$line]->{components} }, $comp);
}
my $fwidth = 0;
my $fheight = 0;
foreach my $l (@lines) {
unless($l->{height}) {
$l->{height} = $l->{tallest};
}
$fheight += $l->{height};
if($l->{width} > $fwidth) {
$fwidth += $l->{width};
}
}
$self->used([$fwidth, $fheight]);
$container->minimum_width($fwidth + $container->outside_width);
$container->minimum_height($fheight + $container->outside_height);
# Size our container, now that everything is done.
if($container->width < $container->minimum_width) {
$container->width($container->minimum_width);
}
if($container->height < $container->minimum_height) {
$container->height($container->minimum_height);
}
super;
return 1;
});
__PACKAGE__->meta->make_immutable;
no Moose;
1;
__END__
=head1 NAME
Layout::Manager::Flow - Directional layout manager
=head1 DESCRIPTION
Layout::Manager::Flow is a layout manager that anchors components in one of
the four cardinal directions.
When you instantiate a Flow manager, you may supply it with an anchor value
which may be one of north, south, east or west. The example below shows
how the default anchor value of north works when you add two components.
north
+--------------------------------+
| component 1 |
+--------------------------------+
| component 2 |
+--------------------------------+
| |
| |
| |
+--------------------------------+
Components are placed in the order they are added. If two items are added
with a 'north' anchor then the first item will be rendered above the
second. Components will be expanded to take up all space perpendicular to
their anchor. North and south will expand widths while east and west will
expand heights.
Flow is similar to Java's
L<FlowLayout|http://java.sun.com/docs/books/tutorial/uiswing/layout/flow.html>.
It does not, however, center components. This features may be added in the
future if they are needed.
=head1 SYNOPSIS
$cont->add_component($comp1);
$cont->add_component($comp2);
my $lm = Layout::Manager::Flow->new(anchor => 'north');
$lm->do_layout($cont);
=head1 ATTRIBUTES
=head2 anchor
The direction this manager is anchored. Valid values are north, south, east
and west.
=head2 used
Returns the amount of space used an arrayref in the form of C<[ $width, $height ]>.
=head2 wrap
If set to a true value, then component will be 'wrapped' when they do not
fit. B<This currently only works for East and West anchored layouts.>
=head1 METHODS
=head2 do_layout
Size and position the components in this layout.
=head1 AUTHOR
Cory Watson, C<< <gphat@cpan.org> >>
=head1 COPYRIGHT & LICENSE
Copyright 2008 by Cory G Watson
This program is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.
|