function fmt($fs)
{
$s = new FormattedText(false);
$args = func_get_args();
$args[0] = _($args[0]);
$s->_init($args);
return $s;
}
/**
* Overrides the TextContainer::isValid().
*
* @see TextContainer::isValid().
* @return true for valid Caption when it is filled, false otherwise.
*/
public function isValid()
{
return parent::isValid() || $this->title && $this->title->isValid();
}
/**
* Adds content to the formatted text.
*
* @param string|FormattedText|TextContainer The content can be a string or a FormattedText.
*
* @return $this
*/
public function appendText($child)
{
Type::enforce($child, [Type::STRING, FormattedText::getClassName(), TextContainer::getClassName()]);
$this->textChildren[] = $child;
return $this;
}