java qr code app GRAPHICS AND THE WEB in Java

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GRAPHICS AND THE WEB
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mkdir($self->{out_dir}) or directory exists die "Cannot create dir $self->{out_dir}" unless -d $self->{out_dir}; foreach my $li (-1 .. $#{$self->{_lists}}) { my $fn = "$self->{out_dir}/"; A special case for the $fn .= ($li == -1) master index 'index.html' : $self->{_lists}->[$li]->{filename};
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my $h = CGI->new(); open(OUT, ">$fn") or die "Cannot open $fn: $!"; print OUT $h->start_html( -title => $self->{title} || '', -bgcolor => '#ffffe7' ), $h->start_table( {-cellpadding => 10, -bgcolor =>
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Create an HTML file for the index of this list
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'#ffffe7'});
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foreach my $lj (0 .. $#{$self->{_lists}}) { my $list = $self->{_lists}->[$lj]; print OUT $list->index_entry($li == $lj); } print OUT $h->end_table, $h->end_html; } }
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Get the index entry for the contained list
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After making sure the output directory exists, a loop is set up over all the lists that were added, and for each list, the name of the output file is determined. There is actually one extra run of the loop for element 1. Its purpose is to create the main index, i.e., the index that has only the headers of the sections, with all sections closed (see figure 6.2). This inclusion is also the reason that the code creating the file name looks complex. If the loop index is 1, then the file name becomes index.html, otherwise the file name becomes whatever it was set to in the add_list() method discussed earlier. The outermost loop creates all of the index documents. Each index document needs to have information about all the lists in it. Inside this loop, we need to loop again over all the lists, and ask each list to generate the HTML for its own entry by calling the index_entry() method. We will discuss this method in full later. The only argument it expects is a boolean value that tells it whether to generate only a header, or a full set of thumbnails. It needs to generate thumbnail lists only when the document we are currently generating is the index for the list in question; in other words, when $li == $lj.
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The Picture::List class
We will now look at the code that manages the Picture::List objects. These objects represent individual lists of photos that belong together, and manage the order of these photos, as well as how they should look in an index entry.
package Picture::List; use strict; use CGI qw(-no_debug); sub new { my $proto = my %attrs = my $class = my $self = bless $self }
shift; @_; ref($proto) || $proto; {%attrs, _pictures => []}; => $class;
There is nothing surprising in the package header or its constructor. We use the CGI module again for the creation of the HTML involved, to save work and debugging. A new object gets initialized by using the arguments passed into the constructor, and a reference to an empty array is added. This array will be used to store all the pictures in this list. To add those pictures, the method add_picture() is provided. The add_picture() method instantiates a new Picture object and pushes that onto the end of the discussed array.
sub add_picture { my $self = shift; my $picture = Picture->new(@_); push @{$self->{_pictures}}, $picture; } sub last_picture { my $self = shift; $self->{_pictures}->[-1]; }
The method last_picture() is provided to get a reference to the current picture, so that outside code can easily obtain this information. In the generate_output() method of the Picture::Index class, we discussed asking the Picture::List objects to generate the HTML for themselves. This is accomplished in the following code:
sub index_entry { my $self = shift; my $selected = shift; my $h = CGI->new();
GRAPHICS AND THE WEB
Need to generate HTML if ($selected) for a selected list { my $return = $h->Tr({-valign => 'top'}, $h->td({-align => 'center', -width => 70}, $h->a({-href => 'index.html'}, $h->img({ -src => 'deselect.gif', -width => 70, -height => 20, -border => 0, -alt => '-', }), ), ), $h->td({-bgcolor => '#ffd7d7', -width => '100%'}, $h->tt($h->big($h->b($self->{description}))), ), ); for my $picture (@{$self->{_pictures}}) { $picture->generate_output; $return .= $picture->index_entry; } return $return; } else Need to generate HTML for an unselected list { return $h->Tr({-valign => 'top'}, $h->td({-align => 'center', -width => 70}, $h->a({-href => $self->{filename}}, $h->img({ -src => 'select.gif', -width => 70, -height => 20, -border => 0, -alt => '+', }), ), ), $h->td({-bgcolor => '#ffd7d7', -width => '100%'}, $h->tt($h->big($h->b( $h->a({-href => $self->{filename}}, $self->{description} ), ))), ), ), }
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