rilwis/meta-box

<?php
defined( 'ABSPATH' ) || die;

/**
 * The image select field which behaves similar to the radio field but uses images as options.
 */
class RWMB_Image_Select_Field extends RWMB_Field {
    public static function admin_enqueue_scripts() {
        wp_enqueue_style( 'rwmb-image-select', RWMB_CSS_URL . 'image-select.css', [], RWMB_VER );
        wp_style_add_data( 'rwmb-image-select', 'path', RWMB_CSS_DIR . 'image-select.css' );
        wp_enqueue_script( 'rwmb-image-select', RWMB_JS_URL . 'image-select.js', [ 'jquery' ], RWMB_VER, true );
    }

    /**
     * Get field HTML.
     *
     * @param mixed $meta  Meta value.
     * @param array $field Field parameters.
     * @return string
     */
    public static function html( $meta, $field ) {
        $html    = [];
        $meta    = (array) $meta;
        foreach ( $field['options'] as $value => $image ) {
            $attributes = self::get_attributes( $field, $value );
            $html[]     = sprintf(
                '<label class="rwmb-image-select"><img src="%s"><input %s%s></label>',
                $image,
                self::render_attributes( $attributes ),
                checked( in_array( $value, $meta ), true, false )
            );
        }

        return implode( ' ', $html );
    }

    /**
     * Normalize parameters for field.
     *
     * @param array $field Field parameters.
     * @return array
     */
    public static function normalize( $field ) {
        $field                = parent::normalize( $field );
        $field['options']     = $field['options'] ?? [];
        $field['field_name'] .= $field['multiple'] ? '[]' : '';

        return $field;
    }

    /**
     * Get the attributes for a field.
     *
     * @param array $field Field parameters.
     * @param mixed $value Meta value.
     * @return array
     */
    public static function get_attributes( $field, $value = null ) {
        $attributes          = parent::get_attributes( $field, $value );
        $attributes['id']    = false;
        $attributes['type']  = $field['multiple'] ? 'checkbox' : 'radio';
        $attributes['value'] = $value;

        return $attributes;
    }

    /**
     * Format a single value for the helper functions. Sub-fields should overwrite this method if necessary.
     *
     * @param array    $field   Field parameters.
     * @param string   $value   The value.
     * @param array    $args    Additional arguments. Rarely used. See specific fields for details.
     * @param int|null $post_id Post ID. null for current post. Optional.
     *
     * @return string
     */
    public static function format_single_value( $field, $value, $args, $post_id ) {
        return $value ? sprintf( '<img src="%s">', esc_url( $field['options'][ $value ] ) ) : '';
    }
}