Return a short summary for the current formatter settings of an instance.
If an empty result is returned, the formatter is assumed to have no configurable settings, and no UI will be provided to display a settings form.
$field: The field structure.
$instance: The instance structure.
$view_mode: The view mode for which a settings summary is requested.
A string containing a short summary of the formatter settings.
Note: this list is generated by pattern matching, so it may include some functions that are not actually implementations of this hook.
function hook_field_formatter_settings_summary($field, $instance, $view_mode) {
$display = $instance['display'][$view_mode];
$settings = $display['settings'];
$summary = '';
if ($display['type'] == 'text_trimmed' || $display['type'] == 'text_summary_or_trimmed') {
$summary = t('Length: @chars chars', array(
'@chars' => $settings['trim_length'],
));
}
return $summary;
}