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Move page walkers to classes. Props David House. fixes #2593
git-svn-id: https://develop.svn.wordpress.org/trunk@3704 602fd350-edb4-49c9-b593-d223f7449a82
This commit is contained in:
Ryan Boren
@@ -400,4 +400,283 @@ function is_wp_error($thing) {
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return false;
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}
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// A class for displaying various tree-like structures. Extend the Walker class to use it, see examples at the bottom
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class Walker {
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var $tree_type;
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var $db_fields;
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//abstract callbacks
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function start_lvl($output) { return $output; }
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function end_lvl($output) { return $output; }
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function start_el($output) { return $output; }
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function end_el($output) { return $output; }
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function walk($elements, $to_depth) {
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$args = array_slice(func_get_args(), 2); $parents = array(); $depth = 1; $previous_element = ''; $output = '';
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//padding at the end
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$last_element->post_parent = 0;
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$last_element->post_id = 0;
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$elements[] = $last_element;
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$id_field = $this->db_fields['id'];
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$parent_field = $this->db_fields['parent'];
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$flat = ($to_depth == -1) ? true : false;
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foreach ( $elements as $element ) {
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// If flat, start and end the element and skip the level checks.
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if ( $flat) {
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// Start the element.
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if ( $element->$id_field != 0 ) {
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$cb_args = array_merge( array($output, $element, $depth - 1), $args);
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$output = call_user_func_array(array(&$this, 'start_el'), $cb_args);
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}
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// End the element.
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if ( $element->$id_field != 0 ) {
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$cb_args = array_merge( array($output, $element, $depth - 1), $args);
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$output = call_user_func_array(array(&$this, 'end_el'), $cb_args);
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}
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continue;
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}
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// Walk the tree.
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if ( !empty($previous_element) && ($element->$parent_field == $previous_element->$id_field) ) {
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// Previous element is my parent. Descend a level.
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array_unshift($parents, $previous_element);
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$depth++; //always do this so when we start the element further down, we know where we are
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if ( !$to_depth || ($depth < $to_depth) ) { //only descend if we're below $to_depth
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$cb_args = array_merge( array($output, $depth - 1), $args);
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$output = call_user_func_array(array(&$this, 'start_lvl'), $cb_args);
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}
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} else if ( $element->$parent_field == $previous_element->$parent_field) {
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// On the same level as previous element.
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if ( !$to_depth || ($depth <= $to_depth) ) {
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$cb_args = array_merge( array($output, $previous_element, $depth - 1), $args);
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$output = call_user_func_array(array(&$this, 'end_el'), $cb_args);
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}
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} else if ( $depth > 1 ) {
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// Ascend one or more levels.
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if ( !$to_depth || ($depth <= $to_depth) ) {
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$cb_args = array_merge( array($output, $previous_element, $depth - 1), $args);
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$output = call_user_func_array(array(&$this, 'end_el'), $cb_args);
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}
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while ( $parent = array_shift($parents) ) {
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$depth--;
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if ( !$to_depth || ($depth < $to_depth) ) {
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$cb_args = array_merge( array($output, $depth - 1), $args);
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$output = call_user_func_array(array(&$this, 'end_lvl'), $cb_args);
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$cb_args = array_merge( array($output, $parent, $depth - 1), $args);
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$output = call_user_func_array(array(&$this, 'end_el'), $cb_args);
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}
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if ( $element->$parent_field == $parents[0]->$id_field ) {
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break;
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}
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}
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} else if ( !empty($previous_element) ) {
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// Close off previous element.
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if ( !$to_depth || ($depth <= $to_depth) ) {
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$cb_args = array_merge( array($output, $previous_element, $depth - 1), $args);
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$output = call_user_func_array(array(&$this, 'end_el'), $cb_args);
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}
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}
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// Start the element.
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if ( !$to_depth || ($depth <= $to_depth) ) {
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if ( $element->$id_field != 0 ) {
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$cb_args = array_merge( array($output, $element, $depth - 1), $args);
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$output = call_user_func_array(array(&$this, 'start_el'), $cb_args);
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}
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}
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$previous_element = $element;
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}
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return $output;
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}
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}
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class Walker_Page extends Walker {
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var $tree_type = 'page';
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var $db_fields = array ('parent' => 'post_parent', 'id' => 'ID'); //TODO: decouple this
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function start_lvl($output, $depth) {
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$indent = str_repeat("\t", $depth);
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$output .= "$indent<ul>\n";
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return $output;
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}
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function end_lvl($output, $depth) {
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$indent = str_repeat("\t", $depth);
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$output .= "$indent</ul>\n";
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return $output;
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}
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function start_el($output, $page, $depth, $current_page, $show_date, $date_format) {
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if ( $depth )
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$indent = str_repeat("\t", $depth);
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$css_class = 'page_item';
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if ( $page->ID == $current_page )
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$css_class .= ' current_page_item';
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$output .= $indent . '<li class="' . $css_class . '"><a href="' . get_page_link($page->ID) . '" title="' . wp_specialchars($page->post_title) . '">' . $page->post_title . '</a>';
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if ( !empty($show_date) ) {
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if ( 'modified' == $show_date )
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$time = $page->post_modified;
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else
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$time = $page->post_date;
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$output .= " " . mysql2date($date_format, $time);
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}
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return $output;
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}
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function end_el($output, $page, $depth) {
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$output .= "</li>\n";
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return $output;
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}
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}
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class Walker_PageDropdown extends Walker {
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var $tree_type = 'page';
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var $db_fields = array ('parent' => 'post_parent', 'id' => 'ID'); //TODO: decouple this
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function start_el($output, $page, $depth, $args) {
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$pad = str_repeat(' ', $depth * 3);
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$output .= "\t<option value=\"$page->ID\"";
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if ( $page->ID == $args['selected'] )
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$output .= ' selected="selected"';
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$output .= '>';
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$title = wp_specialchars($page->post_title);
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$output .= "$pad$title";
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$output .= "</option>\n";
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return $output;
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}
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}
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class Walker_Category extends Walker {
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var $tree_type = 'category';
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var $db_fields = array ('parent' => 'category_parent', 'id' => 'cat_ID'); //TODO: decouple this
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function start_lvl($output, $depth, $args) {
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if ( 'list' != $args['style'] )
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return $output;
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$indent = str_repeat("\t", $depth);
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$output .= "$indent<ul class='children'>\n";
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return $output;
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}
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function end_lvl($output, $depth, $args) {
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if ( 'list' != $args['style'] )
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return $output;
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$indent = str_repeat("\t", $depth);
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$output .= "$indent</ul>\n";
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return $output;
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}
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function start_el($output, $category, $depth, $args) {
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extract($args);
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$link = '<a href="' . get_category_link($category->cat_ID) . '" ';
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if ( $use_desc_for_title == 0 || empty($category->category_description) )
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$link .= 'title="'. sprintf(__("View all posts filed under %s"), wp_specialchars($category->cat_name)) . '"';
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else
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$link .= 'title="' . wp_specialchars(apply_filters('category_description',$category->category_description,$category)) . '"';
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$link .= '>';
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$link .= apply_filters('list_cats', $category->cat_name, $category).'</a>';
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if ( (! empty($feed_image)) || (! empty($feed)) ) {
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$link .= ' ';
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if ( empty($feed_image) )
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$link .= '(';
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$link .= '<a href="' . get_category_rss_link(0, $category->cat_ID, $category->category_nicename) . '"';
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if ( !empty($feed) ) {
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$title = ' title="' . $feed . '"';
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$alt = ' alt="' . $feed . '"';
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$name = $feed;
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$link .= $title;
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}
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$link .= '>';
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if ( !empty($feed_image) )
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$link .= "<img src='$feed_image' $alt$title" . ' />';
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else
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$link .= $name;
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$link .= '</a>';
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if (empty($feed_image))
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$link .= ')';
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}
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if ( $show_count )
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$link .= ' ('.intval($category->category_count).')';
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if ( $show_date ) {
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$link .= ' ' . gmdate('Y-m-d', $category->last_update_timestamp);
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}
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if ( 'list' == $args['style'] ) {
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$output .= "\t<li";
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if ( ($category->cat_ID == $current_category) && is_category() )
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$output .= ' class="current-cat"';
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$output .= ">$link\n";
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} else {
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$output .= "\t$link<br />\n";
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}
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return $output;
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}
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function end_el($output, $page, $depth) {
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if ( 'list' != $args['style'] )
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return $output;
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$output .= "</li>\n";
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return $output;
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}
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}
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class Walker_CategoryDropdown extends Walker {
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var $tree_type = 'category';
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var $db_fields = array ('parent' => 'category_parent', 'id' => 'cat_ID'); //TODO: decouple this
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function start_el($output, $category, $depth, $args) {
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$pad = str_repeat(' ', $depth * 3);
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$cat_name = apply_filters('list_cats', $category->cat_name, $category);
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$output .= "\t<option value=\"".$category->cat_ID."\"";
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if ( $category->cat_ID == $args['selected'] )
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$output .= ' selected="selected"';
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$output .= '>';
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$output .= $cat_name;
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if ( $args['show_count'] )
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$output .= ' ('. $category->category_count .')';
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if ( $args['show_last_update'] ) {
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$format = 'Y-m-d';
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$output .= ' ' . gmdate($format, $category->last_update_timestamp);
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}
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$output .= "</option>\n";
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return $output;
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}
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}
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?>
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