FacebookのLike Boxをウィジェットとして作成 : WordPress

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Like Boxをウィジェットに追加する。

» Like Box – Facebook開発者

<?php
/**
 * Add Facebook Like Box
 * 1. display following facebook like box code
 * <pre>
 * <div id="fb-root"></div>
 * </pre>
 *
 * 2. invoke script
 * </pre>
 * <script>( function( d, s, id ) {
 * statements
 * }( document, 'script', 'facebook-jssdk' ));</script>
 * </pre>
 *
 * 3. display like box to fb_link_box
 * <pre>
 * <div class="fb-like-box" data-href="" data-width="292" data-height="300" data-show-faces="true" data-stream="false" data-header="true"></div>
 * </pre>
 *
 * @author Sawai Hiroshi
 */
class Facebook_Like_Box extends WP_Widget
{

    /** constructor */
    function __construct()
    {
        parent::WP_Widget( false, $name = 'Facebook_Like_Box' );
    }

    /**
     * echo the Facebook like page code
     *
     * @param array $args
     * received form WordPress System
     * @param WP_Widget $instance
     * received from widget form
     */
    function widget( $args, $instance )
    {
        extract( $args, EXTR_SKIP);

        $fb_root     = empty( $instance[ 'fb_root' ] )     ? ' ' : apply_filters( 'widget_root', $instance[ 'fb_root' ] );
        $script      = empty( $instance[ 'script' ] )      ? ' ' : apply_filters( 'widget_script', $instance[ 'script' ] );
        $fb_link_box = empty( $instance[ 'fb_link_box' ] ) ? ' ' : apply_filters( 'widget_fb_link_box', $instance[ 'fb_link_box' ] );

        if ( isset( $fb_root ) === true && $fb_root !== '' ) {
            echo $fb_root;
        }
        if ( isset( $script )  === true && $script  !== '' ) {
            echo $script;
        }
        /** @var $before_widget form WP_Widget */
        echo $before_widget;
        if ( isset( $fb_link_box ) === true && $fb_link_box !== '' ) {
            echo $fb_link_box;
        }
        /** @var $after_widget from WP_Widget */
        echo $after_widget;
    }

    /**
     * update the widget
     *
     * @param  object $new_instance
     * received form WordPress System
     * @param  object $old_instance
     * received form WordPress System
     * @return object
     */
    function update( $new_instance, $old_instance )
    {
        return $new_instance;
    }

    /**
     * widget form
     *
     * @param  object $instance new instance
     * received form WordPress System
     * @return string|void
     */
    function form( $instance )
    {
        $fb_root     = empty( $instance[ 'fb_root' ] )     ? ' ' : apply_filters( 'widget_root', $instance[ 'fb_root' ] );
        $script      = empty( $instance[ 'script' ] )      ? ' ' : apply_filters( 'widget_script', $instance[ 'script' ] );
        $fb_link_box = empty( $instance[ 'fb_link_box' ] ) ? ' ' : apply_filters( 'widget_fb_link_box', $instance[ 'fb_link_box' ] );
?>
        <div>
            <label for="<?php echo esc_attr( $this->get_field_id( 'fb_root' ) ); ?>">fb_root :
                <textarea class="widefat" id="<?php echo esc_attr( $this->get_field_id( 'fb_root' ) ); ?>" name="<?php echo esc_attr( $this->get_field_name( 'fb_root' ) ); ?>"><?php echo esc_html( $fb_root ); ?></textarea>
            </label>
        </div>
        <div>
            <label for="<?php echo esc_attr( $this->get_field_id( 'script' ) ); ?>">script :
                <textarea class="widefat" id="<?php echo esc_attr( $this->get_field_id( 'script' ) ); ?>" name="<?php echo esc_attr( $this->get_field_name( 'script' ) ); ?>"><?php echo $script; ?></textarea>
            </label>
        </div>
        <div>
            <label for="<?php echo esc_attr( $this->get_field_id( 'fb_link_box' ) ); ?>">fb link box :
                <textarea class="widefat" id="<?php echo esc_attr( $this->get_field_id( 'fb_link_box' ) ); ?>" name="<?php echo esc_attr( $this->get_field_name( 'fb_link_box' ) ); ?>"><?php echo esc_html( $fb_link_box ); ?></textarea>
            </label>
        </div>
<?php
    }
}

register_widget( 'Facebook_Like_Box' );