// CONTENT BLOCKS
    $meta_boxes[] = array(
        'title' => __( 'Content blocks' ),
        'post_types' => 'page',
        'fields' => array(
            array(
                'id'     => 'content-block',
                'type'   => 'group',
                'clone'  => true,
                'sort_clone' => true,
                'collapsible' => true,
                'group_title' => array( 'field' => 'select-content-block' ),
                'save_state' => true,

                'fields' => array(
                    array(
                        'id'   => 'select-content-block',
                        'name' => __( 'Create a content block', 'rwmb' ),
                        'type' => 'select',
                        'multiple' => false,
                        'placeholder' => 'Select',
                        'options' => array(
                            'text' => 'Freeform text',
                            'slideshow' => 'Slideshow',
                            'gallery' => 'Gallery',
                            'image-and-text' => 'Image and text',
                            'menu' => 'Menu',
                            'call-to-action' => 'Call to action'
                        )
                    ),


                    // TEXT
                    array(
                        'id'     => 'content-block-text',
                        'type'   => 'group',
                        'visible' => array('select-content-block', '=', 'text'),
                        'fields' => array(
                            array(
                                'id'   => 'content-block-text_text-format',
                                'name' => __( 'Text format', 'rwmb' ),
                                'type' => 'select',
                                'multiple' => false,
                                'placeholder' => 'Select',
                                'options' => array(
                                    'standard' => 'Standard',
                                    'blockquote' => 'Blockquote'
                                )
                            ),
                            array(
                                'id'   => 'content-block-text_text-format-standard_title',
                                'name' => __( 'Title', 'rwmb' ),
                                'type' => 'text',
                                'desc' => 'Optional',
                                'visible' => array('content-block-text_text-format', '=', 'standard'),
                            ),
                            array(
                                'id'   => 'content-block-text_text-format-standard_number-of-columns',
                                'name' => __( 'Number of columns', 'rwmb' ),
                                'type' => 'select',
                                'multiple' => false,
                                'visible' => array('content-block-text_text-format', '=', 'standard'),
                                'placeholder' => 'Select',
                                'options' => array(
                                    '2' => '2',
                                    '3' => '3',
                                    '4' => '4'
                                )
                            ),
                            array(
                                'id'   => 'content-block-text_text',
                                'name' => __( 'Text', 'rwmb' ),
                                'type' => 'wysiwyg',
                                // 'options' => array(
                                //  'media_buttons' => false,
                                //  'textarea_rows' => 5
                                // )
                            ),
                            array(
                                'id'   => 'content-block-text_text-align',
                                'name' => __( 'Text align', 'rwmb' ),
                                'type' => 'select',
                                'placeholder' => 'Left',
                                'multiple' => false,
                                'options' => array(
                                    'ac' => 'Centre',
                                    'ar' => 'Right'
                                ),
                                'desc' => 'Default is left',
                                'visible' => array('content-block-text_text-format', '=', 'blockquote'),
                            ),
                        ),
                    ),


                    // SLIDESHOW
                    array(
                        'id'     => 'content-block-slideshow',
                        'type'   => 'group',
                        'visible' => array('select-content-block', '=', 'slideshow'),
                        'fields' => array(
                            array(
                                'id'   => 'content-block-slideshow_slideshow-format',
                                'name' => __( 'Slideshow format', 'rwmb' ),
                                'type' => 'select',
                                'placeholder' => 'Select',
                                'multiple' => false,
                                'options' => array(
                                    'standard' => 'Standard',
                                    'horizontal' => 'Horizontal scrolling',
                                    'group' => 'Group'
                                )
                            ),
                            array(
                                'id'   => 'content-block-slideshow_slideshow-images',
                                'name' => __( 'Slideshow images', 'rwmb' ),
                                'type' => 'image_advanced',
                                'visible' => array('content-block-slideshow_slideshow-format', '=', 'horizontal'),
                            ),
                            array(
                                'id'   => 'content-block-slideshow_slideshow-images_crop',
                                'name' => __( 'Crop slideshow images?', 'rwmb' ),
                                'type' => 'checkbox',
                                'desc' => 'Check to crop images to the size of the slideshow',
                                'visible' => array('content-block-slideshow_slideshow-format', '=', 'standard'),
                            ),
                            array(
                                'id'   => 'content-block-slideshow_subtitle',
                                'name' => __( 'Slideshow subtitle', 'rwmb' ),
                                'type' => 'text',
                                'visible' => array (
                                    'when' => array (
                                        array (
                                            'content-block-slideshow_slideshow-format', '=', 'standard',
                                        ),
                                        array (
                                            'content-block-slideshow_slideshow-format', '=', 'horizontal'
                                        ),
                                    ),
                                    'relation' => 'or',
                                ),
                            ),
                            array(
                                'id'   => 'content-block-slideshow_title',
                                'name' => __( 'Slideshow title', 'rwmb' ),
                                'type' => 'text',
                                'visible' => array (
                                    'when' => array (
                                        array (
                                            'content-block-slideshow_slideshow-format', '=', 'standard',
                                        ),
                                        array (
                                            'content-block-slideshow_slideshow-format', '=', 'horizontal'
                                        ),
                                    ),
                                    'relation' => 'or',
                                ),
                            ),


                            // Standard
                            array(
                                'id'   => 'content-block-slideshow_slideshow-format-standard_make-title-a-link',
                                'name' => __( 'Make title a link?', 'rwmb' ),
                                'type' => 'checkbox',
                                'visible' => array('content-block-slideshow_slideshow-format', '=', 'standard')
                            ),
                            array(
                                'id'   => 'content-block-slideshow_slideshow-format-standard_make-title-a-link_link-type',
                                'name' => __( 'Slideshow title link', 'rwmb' ),
                                'type' => 'select',
                                'multiple' => false,
                                'placeholder' => 'Select',
                                'options' => array(
                                    'page' => 'Page',
                                    'custom' => 'Custom link'
                                ),
                                'visible' => array('content-block-slideshow_slideshow-format-standard_make-title-a-link', '=', true)
                            ),
                            array(
                                'id'   => 'content-block-slideshow_slideshow-format-standard_slide-title-link-custom',
                                'name' => __( 'Slide title', 'rwmb' ),
                                'type' => 'url',
                                'visible' => array('content-block-slideshow_slideshow-format-standard_make-title-a-link_link-type', '=', 'custom')
                            ),
                            array(
                                'id'   => 'content-block-slideshow_slideshow-format-standard_slide-title-link-page',
                                'name' => __( 'Page to link slide', 'rwmb' ),
                                'type' => 'select',
                                'placeholder' => 'Select page',
                                'options' => $pageoptions,
                                'visible' => array('content-block-slideshow_slideshow-format-standard_make-title-a-link_link-type', '=', 'page')
                            ),
                            array(
                                'id'   => 'content-block-slideshow_aside',
                                'name' => __( 'Slideshow aside', 'rwmb' ),
                                'type' => 'textarea',
                                'visible' => array('content-block-slideshow_slideshow-format', '=', 'standard'),
                            ),
                            array(
                                'id'   => 'content-block-slideshow_title-position',
                                'name' => __( 'Title / Subtitle / Aside position', 'rwmb' ),
                                'type' => 'select',
                                'placeholder' => 'Select',
                                'multiple' => false,
                                'visible' => array('content-block-slideshow_slideshow-format', '=', 'standard'),
                                'options' => array(
                                    'top' => 'Top',
                                    'overlay' => 'Overlay'
                                )
                            ),
                            array(
                                'id'   => 'content-block-slideshow_description',
                                'name' => __( 'Slideshow description', 'rwmb' ),
                                'type' => 'wysiwyg',
                                'visible' => array('content-block-slideshow_slideshow-format', '=', 'standard'),
                                'options' => array(
                                    'media_buttons' => false,
                                    'textarea_rows' => 5
                                )
                            ),
                            array(
                                'id'     => 'content-block-slideshow_slideshow-format-standard',
                                'type'   => 'group',
                                'name' => 'Slides',
                                'clone'  => true,
                                'sort_clone' => true,
                                'visible' => array('content-block-slideshow_slideshow-format', '=', 'standard'),
                                'fields' => array(
                                    array(
                                        'id'   => 'content-block-slideshow_slideshow-format-standard_slide-image',
                                        'name' => __( 'Slideshow image', 'rwmb' ),
                                        'type' => 'image_advanced',
                                        'max_file_uploads' => 1,
                                    ),
                                    array(
                                        'id'   => 'content-block-slideshow_slideshow-format-standard_slide-link',
                                        'name' => __( 'Slideshow link', 'rwmb' ),
                                        'type' => 'select',
                                        'multiple' => false,
                                        'placeholder' => 'Select',
                                        'options' => array(
                                            'page' => 'Page',
                                            'custom' => 'Custom link'
                                        ),
                                    ),
                                    array(
                                        'id'   => 'content-block-slideshow_slideshow-format-standard_slide-link-custom',
                                        'name' => __( 'Slide title', 'rwmb' ),
                                        'type' => 'url',
                                        'visible' => array('content-block-slideshow_slideshow-format-standard_slide-link', '=', 'custom')
                                    ),
                                    array(
                                        'id'   => 'content-block-slideshow_slideshow-format-standard_slide-link-page',
                                        'name' => __( 'Page to link slide', 'rwmb' ),
                                        'type' => 'select',
                                        'placeholder' => 'Select page',
                                        'options' => $pageoptions,
                                        'visible' => array('content-block-slideshow_slideshow-format-standard_slide-link', '=', 'page')
                                    ),
                                ),
                            ),


                            // Horizontal
                            array(
                                'id'   => 'content-block-slideshow_number_slides_per_row',
                                'name' => __( 'Number of slides per row', 'rwmb' ),
                                'type' => 'select',
                                'multiple' => false,
                                'placeholder' => 'Select',
                                'options' => array(
                                    '2' => '2',
                                    '3' => '3',
                                    '4' => '4'
                                ),
                                'visible' => array('content-block-slideshow_slideshow-format', '=', 'horizontal'),
                            ),


                            // Group
                            array(
                                'id'   => 'content-block-slideshow_group-subtitle',
                                'name' => __( 'Group subtitle', 'rwmb' ),
                                'type' => 'text',
                                'placeholder' => 'eg. Featured artists',
                                'visible' => array('content-block-slideshow_slideshow-format', '=', 'group'),
                            ),
                            array(
                                'id'   => 'content-block-slideshow_group-title',
                                'name' => __( 'Group title', 'rwmb' ),
                                'type' => 'text',
                                'visible' => array('content-block-slideshow_slideshow-format', '=', 'group'),
                            ),
                            array(
                                'id'     => 'content-block-slideshow_slideshow-format-group',
                                'type'   => 'group',
                                'name' => 'Slides',
                                'clone'  => true,
                                'sort_clone' => true,
                                'visible' => array('content-block-slideshow_slideshow-format', '=', 'group'),
                                'fields' => array(
                                    array(
                                        'id'   => 'content-block-slideshow_slideshow-format-group_slide-title',
                                        'name' => __( 'Slide title', 'rwmb' ),
                                        'type' => 'text',
                                        'placeholder' => 'eg. Ian McKeever'
                                    ),
                                    array(
                                        'id'   => 'content-block-slideshow_slideshow-format-group_slide-image',
                                        'name' => __( 'Slideshow image', 'rwmb' ),
                                        'type' => 'image_advanced',
                                        'max_file_uploads' => 1,
                                    ),
                                    array(
                                        'id'   => 'content-block-slideshow_slideshow-format-group_slide-link',
                                        'name' => __( 'Slideshow link', 'rwmb' ),
                                        'type' => 'select',
                                        'multiple' => false,
                                        'placeholder' => 'Select',
                                        'options' => array(
                                            'page' => 'Page',
                                            'custom' => 'Custom link'
                                        ),
                                    ),
                                    array(
                                        'id'   => 'content-block-slideshow_slideshow-format-group_slide-link-custom',
                                        'name' => __( 'Slide title', 'rwmb' ),
                                        'type' => 'url',
                                        'visible' => array('content-block-slideshow_slideshow-format-group_slide-link', '=', 'custom')
                                    ),
                                    array(
                                        'id'   => 'content-block-slideshow_slideshow-format-group_slide-link-page',
                                        'name' => __( 'Page to link slide', 'rwmb' ),
                                        'type' => 'select',
                                        'placeholder' => 'Select page',
                                        'options' => $pageoptions,
                                        'visible' => array('content-block-slideshow_slideshow-format-group_slide-link', '=', 'page')
                                    ),
                                ),
                            ),
                        ),
                    ),


                    // GALLERY
                    array(
                        'id'     => 'content-block-gallery',
                        'type'   => 'group',
                        'visible' => array('select-content-block', '=', 'gallery'),
                        'fields' => array(
                            array(
                                'id'   => 'content-block-gallery_gallery-format',
                                'name' => __( 'Gallery format', 'rwmb' ),
                                'type' => 'select',
                                'placeholder' => 'Select',
                                'multiple' => false,
                                'options' => array(
                                    'standard' => 'Standard',
                                    'series-index' => 'Series index',
                                    'instagram' => 'Instagram'
                                )
                            ),

                            // Standard
                            array(
                                'id'   => 'content-block-gallery_gallery-images',
                                'name' => __( 'Gallery images', 'rwmb' ),
                                'type' => 'image_advanced',
                                'multiple' => true,
                                'visible' => array('content-block-gallery_gallery-format', '=', 'standard'),
                            ),
                            array(
                                'id'   => 'content-block-gallery_number-of-columns',
                                'name' => __( 'Number of columns', 'rwmb' ),
                                'type' => 'select',
                                'multiple' => false,
                                'visible' => array('content-block-gallery_gallery-format', '=', 'standard'),
                                'placeholder' => 'Select',
                                'options' => array(
                                    '1' => '1',
                                    '2' => '2',
                                    '3' => '3',
                                    '4' => '4'
                                )
                            ),
                            array(
                                'id'   => 'content-block-gallery_gallery-image-format',
                                'name' => __( 'Gallery image format', 'rwmb' ),
                                'type' => 'select',
                                'placeholder' => 'Select',
                                'multiple' => false,
                                'visible' => array('content-block-gallery_gallery-format', '=', 'standard'),
                                'options' => array(
                                    'large' => 'Standard',
                                    'big-square-crop' => 'Square'
                                )
                            ),
                            array(
                                'id'   => 'content-block-gallery_include-image-titles',
                                'name' => __( 'Include image titles?', 'rwmb' ),
                                'type' => 'checkbox',
                                'visible' => array('content-block-gallery_gallery-format', '=', 'standard'),
                            ),
                            array(
                                'id'   => 'content-block-gallery_include-image-captions',
                                'name' => __( 'Include image captions?', 'rwmb' ),
                                'type' => 'checkbox',
                                'visible' => array('content-block-gallery_gallery-format', '=', 'standard'),
                            ),
                            array(
                                'id'   => 'content-block-gallery_edge-to-edge',
                                'name' => __( 'Edge-to-edge images?', 'rwmb' ),
                                'type' => 'checkbox',
                                'visible' => array('content-block-gallery_gallery-format', '=', 'standard'),
                            ),
                            array(
                                'id'   => 'content-block-gallery_alt-value-as-link',
                                'name' => __( 'Use <em>Alt</em> value as link?', 'rwmb' ),
                                'type' => 'checkbox',
                                'visible' => array('content-block-gallery_gallery-format', '=', 'standard'),
                            ),

                            // Series index
                            array(
                                'id'     => 'content-block-gallery_gallery-format_series-index',
                                'type'   => 'group',
                                'clone'  => true,
                                'sort_clone' => true,
                                'name' => 'Series indexes',
                                'visible' => array('content-block-gallery_gallery-format', '=', 'series-index'),
                                'fields' => array(
                                    array(
                                        'id'   => 'content-block-gallery_gallery-format_series-index_series-title',
                                        'name' => __( 'Index title', 'rwmb' ),
                                        'type' => 'text',
                                    ),
                                    array(
                                        'id'   => 'content-block-gallery_gallery-format_series-index_include-series-description',
                                        'name' => __( 'Include index description?', 'rwmb' ),
                                        'type' => 'checkbox',
                                    ),
                                    array(
                                        'id'   => 'content-block-gallery_gallery-format_series-index_series-description',
                                        'name' => __( 'Index description', 'rwmb' ),
                                        'type' => 'wysiwyg',
                                        'visible' => array('content-block-gallery_gallery-format_series-index_include-series-description', '=', true),
                                        'options' => array(
                                            'media_buttons' => false,
                                            'textarea_rows' => 5,
                                            'wp_more' => false
                                        )
                                    ),
                                    array(
                                        'id'   => 'content-block-gallery_gallery-format_series-index_images',
                                        'name' => __( 'Index images', 'rwmb' ),
                                        'type' => 'image_advanced',
                                        'multiple' => true
                                    ),
                                    array(
                                        'id'   => 'content-block-gallery_gallery-format_series-index_number-of-columns',
                                        'name' => __( 'Number of columns', 'rwmb' ),
                                        'type' => 'select',
                                        'multiple' => false,
                                        'placeholder' => 'Select',
                                        'options' => array(
                                            '1' => '1',
                                            '2' => '2',
                                            '3' => '3',
                                            '4' => '4'
                                        )
                                    ),
                                ),
                            ),

                            // Instagram
                            array(
                                'id'   => 'content-block-gallery_gallery-format_instagram_number-of-columns',
                                'name' => __( 'Number of columns', 'rwmb' ),
                                'type' => 'select',
                                'multiple' => false,
                                'visible' => array('content-block-gallery_gallery-format', '=', 'instagram'),
                                'placeholder' => 'Select',
                                'options' => array(
                                    '1' => '1',
                                    '2' => '2',
                                    '3' => '3',
                                    '4' => '4'
                                )
                            ),
                            array(
                                'id'   => 'content-block-gallery_gallery-format_instagram_number-of-photos',
                                'name' => __( 'Number of photos', 'rwmb' ),
                                'type' => 'numvber',
                                'multiple' => false,
                                'visible' => array('content-block-gallery_gallery-format', '=', 'instagram')
                            ),
                        ),
                    ),


                    // IMAGE AND TEXT
                    array(
                        'id'     => 'content-block-image-and-text',
                        'type'   => 'group',
                        'visible' => array('select-content-block', '=', 'image-and-text'),
                        'fields' => array(
                            array(
                                'id'   => 'content-block-image-and-text_image-and-text-format',
                                'name' => __( 'Image and text format', 'rwmb' ),
                                'type' => 'select',
                                'multiple' => false,
                                'placeholder' => 'Select',
                                'options' => array(
                                    'freeform' => 'Freeform',
                                    'page' => 'Page'
                                )
                            ),

                            // Freeform
                            array(
                                'id'   => 'content-block-image-and-text_freeform-images',
                                'name' => __( 'Select image', 'rwmb' ),
                                'type' => 'image_advanced',
                                'max_file_uploads' => 1,
                                'multiple' => false,
                                'visible' => array('content-block-image-and-text_image-and-text-format', '=', 'freeform'),
                            ),
                            array(
                                'id'   => 'content-block-image-and-text_freeform-text',
                                'name' => __( 'Text', 'rwmb' ),
                                'type' => 'wysiwyg',
                                'options' => array(
                                    'media_buttons' => false,
                                    'textarea_rows' => 10
                                ),
                                'visible' => array('content-block-image-and-text_image-and-text-format', '=', 'freeform'),
                            ),

                            // Page
                            array(
                                'id'   => 'content-block-image-and-text_select_page',
                                'name' => __( 'Page', 'rwmb' ),
                                'type' => 'select',
                                'placeholder' => 'Select page',
                                'options' => $pageoptions,
                                'description' => 'Selected page must have a Featured Image and Excerpt to display correctly',
                                'visible' => array('content-block-image-and-text_image-and-text-format', '=', 'page'),
                            ),
                            array(
                                'id'   => 'content-block-image-and-text_select_page_use-alternative-title',
                                'name' => __( 'Use another title?', 'rwmb' ),
                                'type' => 'checkbox',
                                'visible' => array('content-block-image-and-text_image-and-text-format', '=', 'page'),
                                'desc' => 'The page title then becomes a subtitle'
                            ),
                            array(
                                'id'   => 'content-block-image-and-text_select_page_alternative-title',
                                'name' => __( 'Alternative title', 'rwmb' ),
                                'type' => 'text',
                                'visible' => array('content-block-image-and-text_select_page_use-alternative-title', '=', true),
                            ),

                            // Globals
                            array(
                                'id'   => 'content-block-image-and-text_image-and-text-position',
                                'name' => __( 'Image and text position', 'rwmb' ),
                                'type' => 'select',
                                'multiple' => false,
                                'placeholder' => 'Select',
                                'options' => array(
                                    'image-left-text-right' => 'Image left text right',
                                    'image-right-text-left' => 'Image right text left',
                                )
                            ),
                            array(
                                'id'   => 'content-block-image-and-text_edge-to-edge',
                                'name' => __( 'Edge-to-edge images?', 'rwmb' ),
                                'type' => 'checkbox',
                            ),
                        ),
                    ),


                    // MENU
                    array(
                        'id'     => 'content-block-menu',
                        'type'   => 'group',
                        'visible' => array('select-content-block', '=', 'menu'),
                        'fields' => array(
                            array(
                                'id'   => 'content-block-menu_menu-format',
                                'name' => __( 'Menu format', 'rwmb' ),
                                'type' => 'select',
                                'multiple' => false,
                                'placeholder' => 'Select',
                                'options' => array(
                                    'subpages' => 'Subpages'
                                )
                            ),
                        ),
                    ),


                    // CALL TO ACTION
                    array(
                        'id'     => 'content-block-call-to-action',
                        'type'   => 'group',
                        'visible' => array('select-content-block', '=', 'call-to-action'),
                        'fields' => array(
                            array(
                                'id'   => 'content-block-call-to-action_text',
                                'name' => __( 'Call to action text', 'rwmb' ),
                                'type' => 'text'
                            ),
                            array(
                                'id'   => 'content-block-call-to-action_what-link',
                                'name' => __( 'Use different text for the link', 'rwmb' ),
                                'type' => 'checkbox',
                                'desc' => 'By default the call to action text is used as a link'
                            ),
                            array(
                                'id'   => 'content-block-call-to-action_text-link',
                                'name' => __( 'Call to action link text', 'rwmb' ),
                                'type' => 'text',
                                'visible' => array('content-block-call-to-action_what-link', '=', true),
                            ),
                            array(
                                'id'   => 'content-block-call-to-action_link',
                                'name' => __( 'Call to action link', 'rwmb' ),
                                'type' => 'text'
                            ),
                            array(
                                'id'   => 'content-block-call-to-action_text-align',
                                'name' => __( 'Text align', 'rwmb' ),
                                'type' => 'select',
                                'placeholder' => 'Centre',
                                'multiple' => false,
                                'options' => array(
                                    'al' => 'Left',
                                    'ar' => 'Right'
                                ),
                                'desc' => 'Default is centre',
                            ),
                        ),
                    ),
                ),
            ),
        ),
    );