tabset
  tab.active heading = t('layout.edit')
    .offset10
      - if defined?(ang_model)
        = f.input :body, label: false, as: :text,
          input_html: { rows: 10, id: "#{id}-body",
                        'ng-model' => "#{ctrl}.#{ang_model}", 'ng-value' => "#{ctrl}.#{ang_model}" }
      - else
        = f.input :body, label: false, as: :text,
          input_html: { rows: 10, id: "#{id}-body" }

  tab[ heading = t('layout.preview')
       select  = "#{ctrl}.previewBody('#{id}')" ]
    .offset10
      i.fa.fa-spinner.fa-spin.fa-lg ng-show = "#{ctrl}.processing"

      div[ ng-bind-html = "#{ctrl}.preview_body"
           ng-show      = "!#{ctrl}.processing"  ]