From be55326e50e6c7e15a5ff6e915d2efd2ef832fdd Mon Sep 17 00:00:00 2001
From: Ryan Boren <ryan@git.wordpress.org>
Date: Tue, 23 Dec 2008 12:52:37 +0000
Subject: [PATCH] Allow overriding cat walker. Props AaronCampbell. fixes #8682
 for trunk

git-svn-id: https://develop.svn.wordpress.org/trunk@10246 602fd350-edb4-49c9-b593-d223f7449a82
---
 wp-admin/includes/template.php    |  6 ++++--
 wp-includes/category-template.php | 14 ++++++++++++--
 2 files changed, 16 insertions(+), 4 deletions(-)

diff --git a/wp-admin/includes/template.php b/wp-admin/includes/template.php
index 74d25ea2ae..1c9203ac45 100644
--- a/wp-admin/includes/template.php
+++ b/wp-admin/includes/template.php
@@ -439,8 +439,10 @@ class Walker_Category_Checklist extends Walker {
  * @param unknown_type $selected_cats
  * @param unknown_type $popular_cats
  */
-function wp_category_checklist( $post_id = 0, $descendants_and_self = 0, $selected_cats = false, $popular_cats = false ) {
-	$walker = new Walker_Category_Checklist;
+function wp_category_checklist( $post_id = 0, $descendants_and_self = 0, $selected_cats = false, $popular_cats = false, $walker = null ) {
+	if ( empty($walker) || !is_a($walker, 'Walker') )
+		$walker = new Walker_Category_Checklist;
+
 	$descendants_and_self = (int) $descendants_and_self;
 
 	$args = array();
diff --git a/wp-includes/category-template.php b/wp-includes/category-template.php
index e3c1b466b3..fb8e45def4 100644
--- a/wp-includes/category-template.php
+++ b/wp-includes/category-template.php
@@ -719,8 +719,13 @@ function wp_generate_tag_cloud( $tags, $args = '' ) {
  * @see Walker_Category::walk() for parameters and return description.
  */
 function walk_category_tree() {
-	$walker = new Walker_Category;
 	$args = func_get_args();
+	// the user's options are the third parameter
+	if ( empty($args[2]['walker']) || !is_a($args[2]['walker'], 'Walker') )
+		$walker = new Walker_Category;
+	else
+		$walker = $args[2]['walker'];
+
 	return call_user_func_array(array( &$walker, 'walk' ), $args );
 }
 
@@ -732,8 +737,13 @@ function walk_category_tree() {
  * @see Walker_CategoryDropdown::walk() for parameters and return description.
  */
 function walk_category_dropdown_tree() {
-	$walker = new Walker_CategoryDropdown;
 	$args = func_get_args();
+	// the user's options are the third parameter
+	if ( empty($args[2]['walker']) || !is_a($args[2]['walker'], 'Walker') )
+		$walker = new Walker_CategoryDropdown;
+	else
+		$walker = $args[2]['walker'];
+
 	return call_user_func_array(array( &$walker, 'walk' ), $args );
 }