--- /dev/null
+<?php
+/**
+ * Widget API: WP_Widget_Categories class
+ *
+ * @package WordPress
+ * @subpackage Widgets
+ * @since 4.4.0
+ */
+
+/**
+ * Core class used to implement a Categories widget.
+ *
+ * @since 2.8.0
+ *
+ * @see WP_Widget
+ */
+class WP_Widget_Categories extends WP_Widget {
+
+ /**
+ * Sets up a new Categories widget instance.
+ *
+ * @since 2.8.0
+ * @access public
+ */
+ public function __construct() {
+ $widget_ops = array( 'classname' => 'widget_categories', 'description' => __( "A list or dropdown of categories." ) );
+ parent::__construct('categories', __('Categories'), $widget_ops);
+ }
+
+ /**
+ * Outputs the content for the current Categories widget instance.
+ *
+ * @since 2.8.0
+ * @access public
+ *
+ * @param array $args Display arguments including 'before_title', 'after_title',
+ * 'before_widget', and 'after_widget'.
+ * @param array $instance Settings for the current Categories widget instance.
+ */
+ public function widget( $args, $instance ) {
+ static $first_dropdown = true;
+
+ /** This filter is documented in wp-includes/widgets/class-wp-widget-pages.php */
+ $title = apply_filters( 'widget_title', empty( $instance['title'] ) ? __( 'Categories' ) : $instance['title'], $instance, $this->id_base );
+
+ $c = ! empty( $instance['count'] ) ? '1' : '0';
+ $h = ! empty( $instance['hierarchical'] ) ? '1' : '0';
+ $d = ! empty( $instance['dropdown'] ) ? '1' : '0';
+
+ echo $args['before_widget'];
+ if ( $title ) {
+ echo $args['before_title'] . $title . $args['after_title'];
+ }
+
+ $cat_args = array(
+ 'orderby' => 'name',
+ 'show_count' => $c,
+ 'hierarchical' => $h
+ );
+
+ if ( $d ) {
+ $dropdown_id = ( $first_dropdown ) ? 'cat' : "{$this->id_base}-dropdown-{$this->number}";
+ $first_dropdown = false;
+
+ echo '<label class="screen-reader-text" for="' . esc_attr( $dropdown_id ) . '">' . $title . '</label>';
+
+ $cat_args['show_option_none'] = __( 'Select Category' );
+ $cat_args['id'] = $dropdown_id;
+
+ /**
+ * Filter the arguments for the Categories widget drop-down.
+ *
+ * @since 2.8.0
+ *
+ * @see wp_dropdown_categories()
+ *
+ * @param array $cat_args An array of Categories widget drop-down arguments.
+ */
+ wp_dropdown_categories( apply_filters( 'widget_categories_dropdown_args', $cat_args ) );
+ ?>
+
+<script type='text/javascript'>
+/* <![CDATA[ */
+(function() {
+ var dropdown = document.getElementById( "<?php echo esc_js( $dropdown_id ); ?>" );
+ function onCatChange() {
+ if ( dropdown.options[ dropdown.selectedIndex ].value > 0 ) {
+ location.href = "<?php echo home_url(); ?>/?cat=" + dropdown.options[ dropdown.selectedIndex ].value;
+ }
+ }
+ dropdown.onchange = onCatChange;
+})();
+/* ]]> */
+</script>
+
+<?php
+ } else {
+?>
+ <ul>
+<?php
+ $cat_args['title_li'] = '';
+
+ /**
+ * Filter the arguments for the Categories widget.
+ *
+ * @since 2.8.0
+ *
+ * @param array $cat_args An array of Categories widget options.
+ */
+ wp_list_categories( apply_filters( 'widget_categories_args', $cat_args ) );
+?>
+ </ul>
+<?php
+ }
+
+ echo $args['after_widget'];
+ }
+
+ /**
+ * Handles updating settings for the current Categories widget instance.
+ *
+ * @since 2.8.0
+ * @access public
+ *
+ * @param array $new_instance New settings for this instance as input by the user via
+ * WP_Widget::form().
+ * @param array $old_instance Old settings for this instance.
+ * @return array Updated settings to save.
+ */
+ public function update( $new_instance, $old_instance ) {
+ $instance = $old_instance;
+ $instance['title'] = sanitize_text_field( $new_instance['title'] );
+ $instance['count'] = !empty($new_instance['count']) ? 1 : 0;
+ $instance['hierarchical'] = !empty($new_instance['hierarchical']) ? 1 : 0;
+ $instance['dropdown'] = !empty($new_instance['dropdown']) ? 1 : 0;
+
+ return $instance;
+ }
+
+ /**
+ * Outputs the settings form for the Categories widget.
+ *
+ * @since 2.8.0
+ * @access public
+ *
+ * @param array $instance Current settings.
+ */
+ public function form( $instance ) {
+ //Defaults
+ $instance = wp_parse_args( (array) $instance, array( 'title' => '') );
+ $title = sanitize_text_field( $instance['title'] );
+ $count = isset($instance['count']) ? (bool) $instance['count'] :false;
+ $hierarchical = isset( $instance['hierarchical'] ) ? (bool) $instance['hierarchical'] : false;
+ $dropdown = isset( $instance['dropdown'] ) ? (bool) $instance['dropdown'] : false;
+ ?>
+ <p><label for="<?php echo $this->get_field_id('title'); ?>"><?php _e( 'Title:' ); ?></label>
+ <input class="widefat" id="<?php echo $this->get_field_id('title'); ?>" name="<?php echo $this->get_field_name('title'); ?>" type="text" value="<?php echo esc_attr( $title ); ?>" /></p>
+
+ <p><input type="checkbox" class="checkbox" id="<?php echo $this->get_field_id('dropdown'); ?>" name="<?php echo $this->get_field_name('dropdown'); ?>"<?php checked( $dropdown ); ?> />
+ <label for="<?php echo $this->get_field_id('dropdown'); ?>"><?php _e( 'Display as dropdown' ); ?></label><br />
+
+ <input type="checkbox" class="checkbox" id="<?php echo $this->get_field_id('count'); ?>" name="<?php echo $this->get_field_name('count'); ?>"<?php checked( $count ); ?> />
+ <label for="<?php echo $this->get_field_id('count'); ?>"><?php _e( 'Show post counts' ); ?></label><br />
+
+ <input type="checkbox" class="checkbox" id="<?php echo $this->get_field_id('hierarchical'); ?>" name="<?php echo $this->get_field_name('hierarchical'); ?>"<?php checked( $hierarchical ); ?> />
+ <label for="<?php echo $this->get_field_id('hierarchical'); ?>"><?php _e( 'Show hierarchy' ); ?></label></p>
+ <?php
+ }
+
+}
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