function ColorBackgroudFormatter::viewElements

Overrides FormatterInterface::viewElements

File

modules/field_example/src/Plugin/Field/FieldFormatter/ColorBackgroudFormatter.php, line 31

Class

ColorBackgroudFormatter

Plugin implementation of the 'field_example_color_background' formatter.

Namespace

Code

public function viewElements(FieldItemListInterface $items, $langcode) {
    $elements = [];
    foreach ($items as $delta => $item) {
        // Set the value of the CSS color property depending on user provided
        // configuration. Individual configuration items can be accessed with
        // $this->getSetting('key') where 'key' is the same as the key in the
        // form array from settingsForm() and what's defined in the configuration
        // schema.
        $text_color = 'inherit';
        if ($this->getSetting('adjust_text_color')) {
            $text_color = $this->lightness($item->value) < 50 ? 'white' : 'black';
        }
        $elements[$delta] = [
            '#type' => 'html_tag',
            '#tag' => 'p',
            '#value' => $this->t('The content area color has been changed to @code', [
                '@code' => $item->value,
            ]),
            '#attributes' => [
                'style' => 'background-color: ' . $item->value . '; color: ' . $text_color,
            ],
        ];
    }
    return $elements;
}