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<?php
namespace Drupal\link_class\Plugin\Field\FieldWidget;
use Drupal\Core\Field\FieldItemListInterface;
use Drupal\Core\Form\FormStateInterface;
use Drupal\link\Plugin\Field\FieldWidget\LinkWidget;
class LinkClassFieldWidget extends LinkWidget {
public static function defaultSettings() {
return [
'link_class_mode' => 'manual',
'link_class_force' => '',
'link_class_select' => '',
] + parent::defaultSettings();
}
public function settingsForm(array $form, FormStateInterface $form_state) {
$element = parent::settingsForm($form, $form_state);
$field_name = $this->fieldDefinition
->getName();
$element['link_class_mode'] = [
'#type' => 'radios',
'#title' => $this
->t('Method for adding class'),
'#options' => $this
->getModeOptions(),
'#default_value' => $this
->getSetting('link_class_mode'),
'#description' => $this
->t('Select the method you want to use for adding class.'),
];
$element['link_class_force'] = [
'#type' => 'textfield',
'#title' => $this
->t('Link classes'),
'#default_value' => $this
->getSetting('link_class_force'),
'#description' => $this
->t('Set the classes to add on each link. Classes must be separated by a space.'),
'#attributes' => [
'placeholder' => 'btn btn-default',
],
'#size' => '30',
'#states' => [
'visible' => [
':input[name="fields[' . $field_name . '][settings_edit_form][settings][link_class_mode]"]' => [
'value' => 'force_class',
],
],
],
];
$element['link_class_select'] = [
'#type' => 'textarea',
'#title' => $this
->t('Define possibles classes'),
'#default_value' => $this
->getSetting('link_class_select'),
'#description' => $this
->selectClassDescription(),
'#attributes' => [
'placeholder' => 'btn btn-default|Default button' . PHP_EOL . 'btn btn-primary|Primary button',
],
'#size' => '30',
'#states' => [
'visible' => [
':input[name="fields[' . $field_name . '][settings_edit_form][settings][link_class_mode]"]' => [
'value' => 'select_class',
],
],
],
];
return $element;
}
protected function selectClassDescription() {
$description = '<p>' . t('The possible classes this link can have. Enter one value per line, in the format key|label.');
$description .= '<br/>' . t('The key is the string which will be used as a class on a link. The label will be used on edit forms.');
$description .= '<br/>' . t('If the key contains several classes, each class must be separated by a <strong>space</strong>.');
$description .= '<br/>' . t('The label is optional: if a line contains a single string, it will be used as key and label.');
$description .= '</p>';
return $description;
}
public function settingsSummary() {
$summary = parent::settingsSummary();
$option = $this
->getSetting('link_class_mode');
$summary[] = $this
->t('Mode: @link_class_mode', [
'@link_class_mode' => $this
->getModeOptions($option),
]);
if ($option == 'force_class') {
$summary[] = $this
->t('Class(es) added: @link_class_force', [
'@link_class_force' => $this
->getSetting('link_class_force'),
]);
}
if ($option == 'select_class') {
$classes_available = $this
->getSelectOptions($this
->getSetting('link_class_select'), TRUE);
$summary[] = $this
->t('Class(es) available: @link_class_select', [
'@link_class_select' => $classes_available,
]);
}
return $summary;
}
protected function getModeOptions($key = NULL) {
$options = [
'force_class' => $this
->t('Class are automatically added'),
'select_class' => $this
->t('Let users select a class from a list'),
'manual' => $this
->t('Users can set a class manually'),
];
if ($key && isset($options[$key])) {
return $options[$key];
}
return $options;
}
public function formElement(FieldItemListInterface $items, $delta, array $element, array &$form, FormStateInterface $form_state) {
$element = parent::formElement($items, $delta, $element, $form, $form_state);
$item = $items[$delta];
$options = $item
->get('options')
->getValue();
$mode = $this
->getSetting('link_class_mode');
switch ($mode) {
case 'manual':
$element['options']['attributes']['class'] = [
'#type' => 'textfield',
'#title' => $this
->t('Link classes'),
'#default_value' => !empty($options['attributes']['class']) ? $options['attributes']['class'] : '',
'#description' => $this
->t('Add classes to the link. The classes must be separated by a space.'),
'#size' => '30',
];
break;
case 'select_class':
$classes_available = $this
->getSelectOptions($this
->getSetting('link_class_select'));
$default_value = !empty($options['attributes']['class']) ? $options['attributes']['class'] : '';
$element['options']['attributes']['class'] = [
'#type' => 'select',
'#title' => $this
->t('Select a style'),
'#options' => [
'' => $this
->t('- None -'),
] + $classes_available,
'#default_value' => $default_value,
];
break;
case 'force_class':
$element['options']['attributes']['class'] = [
'#type' => 'value',
'#value' => $this
->getSetting('link_class_force'),
];
break;
}
return $element;
}
protected function getSelectOptions($string, $summary = FALSE) {
$options = [];
$lines = preg_split("/\\r\\n|\\r|\\n/", trim($string));
$lines = array_filter($lines);
foreach ($lines as $line) {
list($class, $label) = explode('|', trim($line));
$label = $label ?: $class;
$options[$class] = $label;
}
if ($summary) {
return implode(', ', array_keys($options));
}
return $options;
}
}