at_theme-1.4.1/at_core/forms/ext/markup_overrides.php

<?php

/**
 * @file
 * Generate form elements for the Modify Output settings.
 */

use Drupal\Component\Utility\Html;

$form['markup_overrides'] = [
  '#type' => 'details',
  '#title' => t('Markup Overrides'),
  '#group' => 'extension_settings',
];

$form['markup_overrides']['markup_overrides_settings'] = [
  '#type' => 'fieldset',
  '#title' => t('Markup Overrides'),
  '#weight' => 40,
];

// Responsive Tables.
$form['markup_overrides']['markup_overrides_settings']['responsive-tables'] = [
  '#type' => 'details',
  '#title' => t('Responsive Tables'),
];
$form['markup_overrides']['markup_overrides_settings']['responsive-tables']['settings_responsive_tables'] = [
  '#type' => 'checkbox',
  '#title' => t('Enable responsive tables'),
  '#default_value' => theme_get_setting('settings.responsive_tables'),
  '#description' => t('Enable the responsive tables plugin. To use apply the "responsive-enabled" class to the table element, e.g. <code>@tableexample</code>. In small screens this will hide the overflow and be horizontally scrollable.', ['@tableexample' => '<table class="responsive-enabled">']),
];

// PNG logo.
$form['markup_overrides']['markup_overrides_settings']['png_logo'] = [
  '#type' => 'details',
  '#title' => t('png Logo default'),
];
$form['markup_overrides']['markup_overrides_settings']['png_logo']['settings_png_logo'] = [
  '#type' => 'checkbox',
  '#title' => t('Use .png for the default logo'),
  '#description' => t('Force the branding block to use <code>logo.png</code> file instead of <code>logo.svg</code> for the default site logo. Place a logo.png file in your themes root directory, e.g. <code>@themelogopath</code>', ['@themelogopath' => $subtheme_path . '/logo.png']),
  '#default_value' => theme_get_setting('settings.png_logo'),
];

// Breadcrumbs.
$form['markup_overrides']['markup_overrides_settings']['breadcrumb'] = [
  '#type' => 'details',
  '#title' => t('Breadcrumbs'),
];
$form['markup_overrides']['markup_overrides_settings']['breadcrumb']['description'] = [
  '#type' => 'container',
  '#markup' => t('Settings for the breadcrumb block. First enable the breadcrumb block from the <a href=":blockconfig" target="_blank">block configuration page</a>.', [':blockconfig' => base_path() . 'admin/structure/block']),
];
// Breadcrumbs label?
$form['markup_overrides']['markup_overrides_settings']['breadcrumb']['settings_breadcrumb_label'] = [
  '#type' => 'checkbox',
  '#title' => t('Show the label'),
  '#default_value' => theme_get_setting('settings.breadcrumb_label'),
];
// Breadcrumbs label value.
$form['markup_overrides']['markup_overrides_settings']['breadcrumb']['settings_breadcrumb_label_value'] = [
  '#type' => 'textfield',
  '#title' => t('Enter text for the breadcrumb label'),
  '#default_value' => theme_get_setting('settings.breadcrumb_label_value') ? theme_get_setting('settings.breadcrumb_label_value') : t('You are here:'),
  '#states' => [
    'visible' => ['input[name="settings_breadcrumb_label"]' => ['checked' => TRUE]],
  ],
];
// Breadcrumbs home link?
$form['markup_overrides']['markup_overrides_settings']['breadcrumb']['settings_breadcrumb_home'] = [
  '#type' => 'checkbox',
  '#title' => t('Always remove the "Home" link'),
  '#default_value' => theme_get_setting('settings.breadcrumb_home'),
];
// Breadcrumbs home alone link?
$form['markup_overrides']['markup_overrides_settings']['breadcrumb']['settings_breadcrumb_home_alone'] = [
  '#type' => 'checkbox',
  '#title' => t('Remove "Home" when it\'s the only link'),
  '#default_value' => theme_get_setting('settings.breadcrumb_home_alone'),
  '#states' => [
    'disabled' => ['input[name="settings_breadcrumb_home"]' => ['checked' => TRUE]],
  ],
];
// Breadcrumbs title?
$form['markup_overrides']['markup_overrides_settings']['breadcrumb']['settings_breadcrumb_title'] = [
  '#type' => 'checkbox',
  '#title' => t('Add the page title to breadcrumbs'),
  '#default_value' => theme_get_setting('settings.breadcrumb_title'),
];
// Breadcrumb trim long items.
$form['markup_overrides']['markup_overrides_settings']['breadcrumb']['settings_breadcrumb_item_length'] = [
  '#type' => 'number',
  '#title' => t('Trim long breadcrumb items'),
  '#max-length' => 3,
  '#step' => 0.1,
  '#default_value' => Html::escape(theme_get_setting('settings.breadcrumb_item_length')),
  '#description' => t('Long breadcrumb items (such as titles) may look bad, here you can trim them to a specific length. Set to 0 to disable trimming.'),
  '#attributes' => [
    'min' => 0,
    'max' => 140,
    'step' => 1,
  ],
];
// Breadcrumbs separator.
$form['markup_overrides']['markup_overrides_settings']['breadcrumb']['settings_breadcrumb_separator'] = [
  '#type'  => 'textfield',
  '#title' => t('Separator'),
  '#description' => t('Use UTF8 chars or escaped unicode, e.g. <code> \00BB </code> (chevron &#187;). Spaces are trimmed. <a href=":unicodetable" target="_blank">Unicode-table.com</a> is a good place to find codes.', [':unicodetable' => 'http://unicode-table.com/']),
  '#default_value' => Html::escape(theme_get_setting('settings.breadcrumb_separator')),
  '#size' => 25,
  '#maxlength' => 60,
];

// Search block.
$form['markup_overrides']['markup_overrides_settings']['search-block'] = [
  '#type' => 'details',
  '#title' => t('Search Block'),
];
// Hide search submit.
$form['markup_overrides']['markup_overrides_settings']['search-block']['settings_search_block_hide_submit'] = [
  '#type' => 'checkbox',
  '#title' => t('Hide the submit button'),
  '#default_value' => theme_get_setting('settings.search_block_hide_submit'),
];
// Placeholder text.
$form['markup_overrides']['markup_overrides_settings']['search-block']['settings_search_block_placeholder_text'] = [
  '#type' => 'textfield',
  '#title' => t('Placeholder text'),
  '#default_value' => theme_get_setting('settings.search_block_placeholder_text'),
  '#description' => t('Enter placeholder text you wish to appear in the search field.'),
];

// Login block.
$form['markup_overrides']['markup_overrides_settings']['login-block'] = [
  '#type' => 'details',
  '#title' => t('Login Block'),
];
// Login block placeholder labels.
$form['markup_overrides']['markup_overrides_settings']['login-block']['settings_login_block_placeholder_labels'] = [
  '#type' => 'checkbox',
  '#title' => t('Placeholder labels'),
  '#default_value' => theme_get_setting('settings.login_block_placeholder_labels'),
  '#description' => t('Use html5 placeholder labels instead of real labels.'),
];
// Horizontal login block.
$form['markup_overrides']['markup_overrides_settings']['login-block']['settings_horizontal_login_block'] = [
  '#type' => 'checkbox',
  '#title' => t('Horizontal login block'),
  '#default_value' => theme_get_setting('settings.horizontal_login_block'),
  '#description' => t('Enable a horizontal style login block (all elements on one line). This setting automatically removes links.'),
];
// Login block links.
$form['markup_overrides']['markup_overrides_settings']['login-block']['settings_login_block_remove_links'] = [
  '#type' => 'checkbox',
  '#title' => t('Remove links'),
  '#default_value' => theme_get_setting('settings.login_block_remove_links'),
  '#description' => t('Remove the <em>Create new account</em> and <em>Request new password</em> links from the login block.'),
  '#states' => [
    'checked' => ['input[name="settings_horizontal_login_block"]' => ['checked' => TRUE]],
    'disabled' => ['input[name="settings_horizontal_login_block"]' => ['checked' => TRUE]],
  ],
];

// Comment titles.
$form['markup_overrides']['markup_overrides_settings']['comments'] = [
  '#type' => 'details',
  '#title' => t('Comment Titles'),
];
$form['markup_overrides']['markup_overrides_settings']['comments']['settings_comments_hide_title'] = [
  '#type' => 'checkbox',
  '#title' => t('Hide comment titles'),
  '#default_value' => theme_get_setting('settings.comments_hide_title'),
  '#description' => t('Checking this setting will hide comment titles using element-invisible. Hiding rather than removing titles maintains accessibility and semantic structure while not showing titles to sighted users.'),
];

// Feed icons.
$form['markup_overrides']['markup_overrides_settings']['feed-icons'] = [
  '#type' => 'details',
  '#title' => t('Feed Icons'),
];
$form['markup_overrides']['markup_overrides_settings']['feed-icons']['settings_views_hide_feedicon'] = [
  '#type' => 'checkbox',
  '#title' => t('Hide feed icon in views pages'),
  '#default_value' => theme_get_setting('settings.views_hide_feedicon'),
  '#description' => t('Page views such as the Front page show an RSS feed icon by default, use this setting to remove all page view feed icons.'),
];

// Accessibility.
$form['markup_overrides']['markup_overrides_settings']['a11y'] = [
  '#type' => 'details',
  '#title' => t('Accessibility'),
];

// Skip link target.
if (!empty(theme_get_setting('settings.skip_link_target'))) {
  $skip_link_setting = Html::escape(theme_get_setting('settings.skip_link_target'));
}
else {
  // Try to provide the most likely match.
  $skip_link_setting = 'main-content';
}
$form['markup_overrides']['markup_overrides_settings']['a11y']['settings_skip_link_target'] = [
  '#type' => 'textfield',
  '#title' => t('Skip to navigation target ID'),
  '#description' => t('By default the skip link target is <code>@skiplink</code>. If you need to change this do not include the pound symbol.', ['@skiplink' => $skip_link_setting]),
  '#size' => 60,
  '#maxlength' => 255,
  '#field_prefix' => '#',
  '#default_value' => Html::escape(theme_get_setting('settings.skip_link_target')),
];

// Attribution.
$form['markup_overrides']['markup_overrides_settings']['attribution'] = [
  '#type' => 'details',
  '#title' => t('Attribution'),
];
$form['markup_overrides']['markup_overrides_settings']['attribution']['settings_attribution_toggle'] = [
  '#type' => 'checkbox',
  '#title' => t('Show attribution message'),
  '#description' => t('Displays a message and link for Adaptivethemes.com'),
  '#default_value' => theme_get_setting('settings.attribution_toggle'),
];