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Prima::Themes(3)      User Contributed Perl Documentation     Prima::Themes(3)

       Prima::Themes - object themes management

       Provides	layer for theme	registration in	Prima. Themes are loosely
       grouped alternations of default class properties	and behavior, by
       default stored in "Prima/themes"	subdirectory. The theme	realization is
       implemented as interception of object profile during its	creation,
       inside "::profile_add". Various themes apply various alterations, one
       way only	- once an object is applied a theme, it	cannot be neither
       changed nor revoked thereafter.

       Theme configuration can be stored in an rc file,	~/.prima/themes, and
       is loaded automatically,	unless $Prima::Themes::load_rc_file explicitly
       set to 0	before loading the "Prima::Themes" module. In effect, any
       Prima application not aware of themes can be coupled with themes	in the
       rc file by the following:

	       perl -MPrima::Themes program

       "Prima::Themes" namespace provides registration and execution
       functionality.  "Prima::Themes::Proxy" is a class for overriding
       certain methods,	for internal realization of a theme.

       For interactive theme selection use examples/ sample program.

	       # register a theme file
	       use Prima::Themes qw(color);
	       # or
	       use Prima::Themes; load('color');
	       # list registered themes
	       print Prima::Themes::list;

	       # install a theme
	       # list installed	themes
	       print Prima::Themes::list_active;
	       # create	object with another theme while	'cyan' is active
	       Class->create( theme => 'yellow');
	       # remove	a theme

       load @THEME_MODULES
	   Load	THEME_MODULES from files via "use" clause, dies	on error.  Can
	   be used instead of explicit "use".

	   A loaded theme file may register one	or more	themes.

	   Registers a previously loaded theme.	$THEME is a unique string
	   identifier.	$MATCH is an array of pairs, where the first item is a
	   class name, and the second is an arbitrary scalar parameter.	When a
	   new object is created, its class is matched via "isa" to each given
	   class name, and if matched, the $CALLBACK routine is	called with
	   the following parameters: object, default profile, user profile,
	   second item of the matched pair.

	   If $CALLBACK	is "undef", the	default	merger routine is called,
	   which treats	the second items of the	pairs as hashes	of the same
	   format as the default and user profiles.

	   The theme is	inactive until "install" is called. If $INSTALLER
	   subroutine is passed, it is called during install and uninstall,
	   with	two parameters,	the name of the	theme and boolean
	   install/uninstall flag. When	install	flag is	1, the theme is	about
	   to be installed; the	subroutine is expected to return a boolean
	   success flag. Otherwise, subroutine return value is not used.

	   $FILE is used to indicate the file in which the theme is stored.

       deregister $THEME
	   Un-registers	$THEME.

       install @THEMES
	   Installs previosuly loaded and registered loaded THEMES; the
	   installed themes are	now used to match new objects.

       uninstall @THEMES
	   Uninstalls loaded THEMES.

	   Returns the list of registered themes.

	   Returns the list of installed themes.

       loaded $THEME
	   Return 1 if $THEME is registered, 0 otherwise.

       active $THEME
	   Return 1 if $THEME is installed, 0 otherwise.

       select @THEMES
	   Uninstalls all currently installed themes, and installs THEMES

	   Default profile merging routine, merges $PROFILE_THEME into

       load_rc [ $INSTALL = 1 ]
	   Reads data ~/.prima/themes and loads	listed modules.	 If $INSTALL =
	   1, installs the themes from the rc file.

	   Writes configuration	of currently installed themes into rc file,
	   returns success flag. If success flag is 0, $! contains the error.

       An instance of "Prima::Themes::Proxy", created as

       Prima::Themes::Proxy-> new( $OBJECT)

       is a non-functional wrapper for any Perl	object $OBJECT.	All methods of
       $OBJECT,	except "AUTOLOAD", "DESTROY", and "new", are forwarded to
       $OBJECT itself transparently. The class can be used, for	example, to
       deny all	changes	to "lineWidth" inside object's painting	routine:

	       package ConstLineWidth;
	       use vars	qw(@ISA);
	       @ISA = qw(Prima::Themes::Proxy);

	       sub lineWidth { 1 } # line width	is always 1 now!

	       Prima::Themes::register(	'~/lib/', 'constlinewidth',
		       [ 'Prima::Widget' => {
			       onPaint => sub {
				       my ( $object, $canvas) =	@_;
				       $object-> on_paint( ConstLineWidth-> new( $canvas));
		       } ]

       Dmitry Karasik, <>.


       Prima, Prima::Object, examples/

perl v5.24.1			  2017-02-27		      Prima::Themes(3)

NAME | DESCRIPTION | SYNOPSIS | Prima::Themes | Prima::Themes::Proxy | AUTHOR | FILES | SEE ALSO

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