Drupal 7 Module Development

Chapter 7
}
else if ($settings['units_as'] == 'none') {
$summary = t('Do not show units');
}
}
return $summary;
The form hook is a very simple form offering the user a select box to pick what the
units_as setting should be: column, cell, or none. As with other settings forms, the
name of the form element matches the name of the settings variable so it gets saved
automatically. The summary hook, then, simply takes that setting and returns a
string that Drupal can display to the user so that he knows what the current
setting is.
Now let's have a look at the view hook code for the table formatter:
function dimfield_field_formatter_view($obj_type, $object, $field,
$instance, $langcode, $items, $display) {
$element = array();
$settings = $display['settings'];
switch ($display['type']) {
// ...
case 'dimfield_table':
$rows = array();
foreach ($items as $delta => $item) {
$row = array();
if ($settings['units_as'] == 'cell') {
$row[] = t('@value (%units)', array(
'@value' => $item['height'],
'%units' => dimfield_units($item['units']),
));
$row[] = t('@value (%units)', array(
'@value' => $item['width'],
'%units' => dimfield_units($item['units']),
));
}
else {
$row[] = $item['height'];
$row[] = $item['width'];
}
if ($field['settings']['num_dimensions'] == 3) {
if ($settings['units_as'] == 'cell') {
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