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Re: Moose: possible way to implement trigger in other packages?

by stvn (Monsignor)
on Jul 04, 2010 at 23:54 UTC ( #848009=note: print w/replies, xml ) Need Help??

in reply to Moose: possible way to implement trigger in other packages?

You can do this using required methods in the role and treating them as delegated "events". This is actually a pretty common technique in the Cocoa framework used by Mac OSX and the iPhone OS. Here is how that might look.

package RolePage; use Moose::Role; has textFont => ( is => 'rw', isa => 'Str', default => 'Courier', trigger => sub { my $self = shift; $self->text_attribute_changed } ); has textSize => ( is => 'rw', isa => 'Int', default => 12, trigger => sub { my $self = shift; $self->text_attribute_changed } ); requires 'text_attribute_changed';
Then in your class you can do:
package CairoPage; use Moose; use Cairo; with 'RolePage'; has cairoFont => ( is => 'bare', isa => 'Cairo::ScaledFont', ); sub text_attribute_changed { # ... do whatever you need to here ... }


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[LanX]: Choroba: do you miss chaos with ties? apply at the US government.. ;)
[ambrus]: Corion: those are good rules.
[ambrus]: Discipulus: oh sure. the input data has different filenames every time I get them.
[ambrus]: the directory structure may be 1, 2, or 3 deep, it may have spaces in the filename or not, it has dates in various format, different keywords for the same meanings, and the dates and other keywords are assembled in various ways.
[Discipulus]: no ambrus by specification i mean for example license per core instead of per socket, so fields are different

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