silverstripe-framework/View/TemplateIteratorProvider.php

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<?php
namespace SilverStripe\View;
/**
* Interface that is implemented by any classes that want to expose a method that can be called in any
* scope in a template that returns values dependant on the state of the iterator of the current scope.
*
* SSViewer_BasicIteratorSupport is an example of this. See also @TemplateGlobalProvider
*/
interface TemplateIteratorProvider {
/**
* Called by SSViewer to get a list of iterator variables to expose to the template, the instance method to call
* on an instance of this class to get the value for those variables, and the class to use for casting the returned
* value for use in a template
*
* If the method to call is not included for a particular template variable, a method named the same as the
* template variable will be called
*
* If the casting class is not specified for a particular template variable, ViewableData::$default_cast is used
*
* The first letter of the template variable is case-insensitive. However the method name is always case sensitive.
*
* @abstract
* @return array Returns an array of items. Each key => value pair is one of three forms:
* - template name (no key)
* - template name => method name
* - template name => array(), where the array can contain these key => value pairs
* - "method" => method name
* - "casting" => casting class to use (i.e., Varchar, HTMLFragment, etc)
*/
public static function get_template_iterator_variables();
/**
* Set the current iterator properties - where we are on the iterator.
*
* This is called by SSViewer prior to calling any of the variables exposed to the template (that is, as returned
* from a call to get_template_iterator_variables)
*
* @abstract
* @param int $pos position in iterator
* @param int $totalItems total number of items
*/
public function iteratorProperties($pos, $totalItems);
}