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package Image::ButtonMaker::ButtonClass; |
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use strict; |
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use Image::ButtonMaker::Button; |
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#### Default values for classes: a class is just a hash |
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my @defaults = ( |
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classname => '', |
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parent => '', |
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container => undef, |
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properties => {}, |
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); |
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our $error; |
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our $errorstr; |
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sub new { |
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my $invocant = shift; |
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my $class = ref($invocant) || $invocant; |
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my %prototype = @_; |
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return |
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set_error(1000, "No class name specified") |
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unless($prototype{classname}); |
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#### Check properites validity #### |
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my $prop = $prototype{properties} || {}; |
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return |
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set_error(1001, "properties argument must be a HASH ref") |
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if(ref($prop) ne 'HASH'); |
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foreach my $p (keys(%$prop)) { |
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return |
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set_error(1002, "Illegal property: $p") |
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unless(Image::ButtonMaker::Button->is_property_legal($p)); |
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} |
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my $object = { @defaults, %prototype}; |
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bless $object, $class; |
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return $object; |
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} |
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#### Instance Methods ####################################################### |
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sub set_container { |
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my $self = shift; |
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my $container = shift; |
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reset_error(); |
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$self->{container} = $container; |
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return; |
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} |
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sub lookup_name { |
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my $self = shift; |
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reset_error(); |
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return $self->{classname}; |
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} |
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sub lookup_parent { |
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my $self = shift; |
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reset_error(); |
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return $self->{parent}; |
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} |
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sub lookup_property { |
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my $self = shift; |
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my $propname = shift; |
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reset_error(); |
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my $prop = $self->{properties}; |
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return $prop->{$propname} if(defined($prop->{$propname})); |
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if($self->{parent}) { |
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return set_error(2000, "Parent attribute is set, but no container is given") |
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unless($self->{container}); |
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my $container = $self->{container}; |
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my $parent_obj = $container->lookup_class($self->{parent}); |
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return set_error(2000, "Parent class not found") |
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unless($parent_obj); |
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return $parent_obj->lookup_property($propname); |
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} |
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return undef; |
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} |
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#### Set property. Return undef if property is illegal |
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sub set_property { |
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reset_error(); |
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my $self = shift; |
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my ($propname, $propvalue) = (@_); |
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return set_error(2000, "No property name given") |
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unless(defined($propname)); |
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return set_error(2000, "Illegal property name $propname") |
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unless(Image::ButtonMaker::Button->is_property_legal($propname)); |
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$self->{properties}{$propname} = $propvalue; |
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return $propvalue; |
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} |
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113
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114
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#### Remove property from properties HASH and return the property value |
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## which _can_ be inherited from some parent class |
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sub delete_property { |
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reset_error(); |
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my $self = shift; |
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my ($propname) = (@_); |
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121
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return set_error(2000, "No property name given") |
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unless(defined($propname)); |
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return set_error(2000, "Illegal property name $propname") |
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unless(Image::ButtonMaker::Button->is_property_legal($propname)); |
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} |
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127
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128
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#### Package methods ############################################################ |
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#### Set and reset package-wide error codes |
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sub reset_error { |
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$error = 0; |
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$errorstr = 0; |
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return; |
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} |
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136
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sub set_error { |
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$error = shift; |
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$errorstr = shift; |
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return undef; |
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} |
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1; |