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Improve inline documentation for the `Walker` class. 

Includes previously undocumented parameters.

See #23406.

Built from https://develop.svn.wordpress.org/trunk@25644


git-svn-id: http://core.svn.wordpress.org/trunk@25561 1a063a9b-81f0-0310-95a4-ce76da25c4cd
This commit is contained in:
Drew Jaynes 2013-09-28 21:29:10 +00:00
parent 39d7e0df8a
commit 190913aaa7
1 changed files with 64 additions and 53 deletions
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117
wp-includes/class-wp-walker.php
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@ -2,14 +2,13 @@
/**
* A class for displaying various tree-like structures.
*
* Extend the Walker class to use it, see examples at the below. Child classes
* Extend the Walker class to use it, see examples below. Child classes
* do not need to implement all of the abstract methods in the class. The child
* only needs to implement the methods that are needed. Also, the methods are
* not strictly abstract in that the parameter definition needs to be followed.
* The child classes can have additional parameters.
* only needs to implement the methods that are needed.
*
* @since 2.1.0
*
* @package WordPress
* @since 2.1.0
* @abstract
*/
class Walker {
@ -43,57 +42,64 @@ class Walker {
/**
* Starts the list before the elements are added.
*
* Additional parameters are used in child classes. The args parameter holds
* additional values that may be used with the child class methods. This
* method is called at the start of the output list.
* The $args parameter holds additional values that may be used with the child
* class methods. This method is called at the start of the output list.
*
* @since 2.1.0
* @abstract
*
* @param string $output Passed by reference. Used to append additional content.
* @param int $depth Depth of the item.
* @param array $args An array of additional arguments.
*/
function start_lvl( &$output, $depth = 0, $args = array() ) {}
/**
* Ends the list of after the elements are added.
*
* Additional parameters are used in child classes. The args parameter holds
* additional values that may be used with the child class methods. This
* method finishes the list at the end of output of the elements.
* The $args parameter holds additional values that may be used with the child
* class methods. This method finishes the list at the end of output of the elements.
*
* @since 2.1.0
* @abstract
*
* @param string $output Passed by reference. Used to append additional content.
* @param int $depth Depth of the item.
* @param array $args An array of additional arguments.
*/
function end_lvl( &$output, $depth = 0, $args = array() ) {}
function end_lvl( &$output, $depth = 0, $args = array() ) {}
/**
* Start the element output.
*
* Additional parameters are used in child classes. The args parameter holds
* additional values that may be used with the child class methods. Includes
* the element output also.
* The $args parameter holds additional values that may be used with the child
* class methods. Includes the element output also.
*
* @since 2.1.0
* @abstract
*
* @param string $output Passed by reference. Used to append additional content.
* @param string $output Passed by reference. Used to append additional content.
* @param object $object The data object.
* @param int $depth Depth of the item.
* @param array $args An array of additional arguments.
* @param int $current_object_id ID of the current item.
*/
function start_el( &$output, $object, $depth = 0, $args = array(), $current_object_id = 0 ) {}
function start_el( &$output, $object, $depth = 0, $args = array(), $current_object_id = 0 ) {}
/**
* Ends the element output, if needed.
*
* Additional parameters are used in child classes. The args parameter holds
* additional values that may be used with the child class methods.
* The $args parameter holds additional values that may be used with the child class methods.
*
* @since 2.1.0
* @abstract
*
* @param string $output Passed by reference. Used to append additional content.
* @param object $object The data object.
* @param int $depth Depth of the item.
* @param array $args An array of additional arguments.
*/
function end_el( &$output, $object, $depth = 0, $args = array() ) {}
function end_el( &$output, $object, $depth = 0, $args = array() ) {}
/**
* Traverse elements to create list from elements.
@ -103,16 +109,16 @@ class Walker {
* depth and no ignore elements under that depth. It is possible to set the
* max depth to include all depths, see walk() method.
*
* This method shouldn't be called directly, use the walk() method instead.
* This method should not be called directly, use the walk() method instead.
*
* @since 2.5.0
*
* @param object $element Data object
* @param array $children_elements List of elements to continue traversing.
* @param int $max_depth Max depth to traverse.
* @param int $depth Depth of current element.
* @param array $args
* @param string $output Passed by reference. Used to append additional content.
* @param object $element Data object.
* @param array $children_elements List of elements to continue traversing.
* @param int $max_depth Max depth to traverse.
* @param int $depth Depth of current element.
* @param array $args An array of arguments.
* @param string $output Passed by reference. Used to append additional content.
* @return null Null on failure with no changes to parameters.
*/
function display_element( $element, &$children_elements, $max_depth, $depth, $args, &$output ) {
@ -160,16 +166,17 @@ class Walker {
/**
* Display array of elements hierarchically.
*
* It is a generic function which does not assume any existing order of
* elements. max_depth = -1 means flatly display every element. max_depth =
* 0 means display all levels. max_depth > 0 specifies the number of
* display levels.
* Does not assume any existing order of elements.
*
* $max_depth = -1 means flatly display every element.
* $max_depth = 0 means display all levels.
* $max_depth > 0 specifies the number of display levels.
*
* @since 2.1.0
*
* @param array $elements
* @param int $max_depth
* @return string
* @param array $elements An array of elements.
* @param int $max_depth The maximum hierarchical depth.
* @return string The hierarchical item output.
*/
function walk( $elements, $max_depth) {
@ -194,10 +201,10 @@ class Walker {
}
/*
* need to display in hierarchical order
* separate elements into two buckets: top level and children elements
* children_elements is two dimensional array, eg.
* children_elements[10][] contains all sub-elements whose parent is 10.
* Need to display in hierarchical order.
* Separate elements into two buckets: top level and children elements.
* Children_elements is two dimensional array, eg.
* Children_elements[10][] contains all sub-elements whose parent is 10.
*/
$top_level_elements = array();
$children_elements = array();
@ -209,8 +216,8 @@ class Walker {
}
/*
* when none of the elements is top level
* assume the first one must be root of the sub elements
* When none of the elements is top level.
* Assume the first one must be root of the sub elements.
*/
if ( empty($top_level_elements) ) {
@ -231,8 +238,8 @@ class Walker {
$this->display_element( $e, $children_elements, $max_depth, 0, $args, $output );
/*
* if we are displaying all levels, and remaining children_elements is not empty,
* then we got orphans, which should be displayed regardless
* If we are displaying all levels, and remaining children_elements is not empty,
* then we got orphans, which should be displayed regardless.
*/
if ( ( $max_depth == 0 ) && count( $children_elements ) > 0 ) {
$empty_array = array();
@ -251,11 +258,14 @@ class Walker {
* and number of elements per page, this function first determines all top level root elements
* belonging to that page, then lists them and all of their children in hierarchical order.
*
* @package WordPress
* @since 2.7
* @param int $max_depth = 0 means display all levels; $max_depth > 0 specifies the number of display levels.
* @param int $page_num the specific page number, beginning with 1.
* @return XHTML of the specified page of elements
* $max_depth = 0 means display all levels.
* $max_depth > 0 specifies the number of display levels.
*
* @since 2.7.0
*
* @param int $max_depth The maximum hierarchical depth.
* @param int $page_num The specific page number, beginning with 1.
* @return string XHTML of the specified page of elements
*/
function paged_walk( $elements, $max_depth, $page_num, $per_page ) {
@ -309,9 +319,9 @@ class Walker {
}
/*
* separate elements into two buckets: top level and children elements
* children_elements is two dimensional array, eg.
* children_elements[10][] contains all sub-elements whose parent is 10.
* Separate elements into two buckets: top level and children elements.
* Children_elements is two dimensional array, e.g.
* $children_elements[10][] contains all sub-elements whose parent is 10.
*/
$top_level_elements = array();
$children_elements = array();
@ -342,7 +352,7 @@ class Walker {
foreach ( $top_level_elements as $e ) {
$count++;
//for the last page, need to unset earlier children in order to keep track of orphans
// For the last page, need to unset earlier children in order to keep track of orphans.
if ( $end >= $total_top && $count < $start )
$this->unset_children( $e, $children_elements );
@ -377,7 +387,7 @@ class Walker {
return $num;
}
// unset all the children for a given top level element
// Unset all the children for a given top level element.
function unset_children( $e, &$children_elements ){
if ( !$e || !$children_elements )
@ -394,4 +404,5 @@ class Walker {
unset( $children_elements[$id] );
}
}
} // Walker