function Text3Widget::formElement

Overrides WidgetInterface::formElement

File

modules/field_example/src/Plugin/Field/FieldWidget/Text3Widget.php, line 26

Class

Text3Widget

Plugin implementation of the 'field_example_3text' widget.

Namespace

Code

public function formElement(FieldItemListInterface $items, $delta, array $element, array &$form, FormStateInterface $form_state) {
    $value = $items[$delta]->value ?? '';
    // Parse the single hex string into RBG values.
    if (!empty($value)) {
        preg_match_all('@..@', substr($value, 1), $match);
    }
    else {
        $match = [
            [],
        ];
    }
    // Set up the form element for this widget.
    $element += [
        '#type' => 'details',
        '#element_validate' => [
            [
                $this,
                'validate',
            ],
        ],
    ];
    // Add in the RGB textfield elements.
    foreach ([
        'r' => $this->t('Red'),
        'g' => $this->t('Green'),
        'b' => $this->t('Blue'),
    ] as $key => $title) {
        $element[$key] = [
            '#type' => 'textfield',
            '#title' => $title,
            '#size' => 2,
            '#default_value' => array_shift($match[0]),
            '#attributes' => [
                'class' => [
                    'rgb-entry',
                ],
            ],
            '#description' => $this->t('The 2-digit hexadecimal representation of @color saturation, like "a1" or "ff"', [
                '@color' => $title,
            ]),
        ];
        // Since Form API doesn't allow a fieldset to be required, we
        // have to require each field element individually.
        if ($element['#required']) {
            $element[$key]['#required'] = TRUE;
        }
    }
    return [
        'value' => $element,
    ];
}