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<?php
namespace OOUI;
/**
* Theme logic.
*
* @abstract
*/
class Theme {
/* Members */
private static $singleton;
/* Static Methods */
public static function setSingleton( Theme $theme ) {
self::$singleton = $theme;
}
public static function singleton() {
if ( !self::$singleton ) {
throw new Exception( __METHOD__ . ' was called with no singleton theme set.' );
}
return self::$singleton;
}
/**
* Get a list of classes to be applied to a widget.
*
* The 'on' and 'off' lists combined MUST contain keys for all classes the theme adds or removes,
* otherwise state transitions will not work properly.
*
* @param Element $element Element for which to get classes
* @return array Categorized class names with `on` and `off` lists
*/
public function getElementClasses( Element $element ) {
return array( 'on' => array(), 'off' => array() );
}
/**
* Update CSS classes provided by the theme.
*
* For elements with theme logic hooks, this should be called any time there's a state change.
*
* @param Element $element Element for which to update classes
* @return array Categorized class names with `on` and `off` lists
*/
public function updateElementClasses( Element $element ) {
$classes = $this->getElementClasses( $element );
$element
->removeClasses( $classes['off'] )
->addClasses( $classes['on'] );
}
}
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