Drupal 7 Module Development

Chapter 7
if ($widget['type'] == 'dimfield_combined') {
$form['size'] = array(
'#type' => 'textfield',
'#title' => t('Size of textfield'),
'#default_value' => $settings['size'],
'#required' => TRUE,
'#element_validate' =>
array('_element_validate_integer_positive'),
);
}
}
return $form;
As with all of our other callbacks, we check the widget type and then return a form
fragment for the field we want. Note that the textfield is named the same as the
setting property we defined in dimfield_field_widget_info(), which is how
Drupal knows which setting is which. We also are leveraging the Form API's ability
to provide element-specific validators. In this case, we are using a validation callback
that Drupal provides. It will throw a validation error if the user specifies anything
other than a positive integer. (A widget size of -7.4 would not make much sense,
would it?)
Now, we can expand our field_widget_form callback to include our new widget.
function dimfield_field_widget_form(&$form, &$form_state, $field,
$instance, $langcode, $items,
$delta, $element) {
$base = $element;
if ($instance['widget']['type'] == 'dimfield_simple') {
// ...
}
elseif ($instance['widget']['type'] == 'dimfield_combined') {
$element['#element_validate'] = array(
'_dimfield_combined_validate');
$default = NULL;
if (isset($items[$delta])) {
$item = $items[$delta];
if (isset($item['height'], $item['width'])) {
$default = $item['height'] . 'x' . $item['width'];
if ($field['settings']['num_dimensions'] == 3) {
$default .= 'x' . $item['depth'];
}
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