function diff_form_alter in Diff 5

Same name and namespace in other branches

1. 5.2 diff.module \diff_form_alter()
2. 6.2 diff.module \diff_form_alter()
3. 6 diff.module \diff_form_alter()
4. 7.2 diff.module \diff_form_alter()

Implementation of hook_form_alter(). Used to add a 'Preview changes' button on the node edit form.

File

./diff.module, line 442

Code

function diff_form_alter($form_id, &$form) {
  if (isset($form['type']) && $form['type']['#value'] . '_node_form' == $form_id) {

    // Node editing form.
    // Add a 'Preview changes' button.
    if (variable_get('show_preview_changes_' . $form['type']['#value'], TRUE) && $form['nid']['#value'] > 0) {
      $form['preview_changes'] = array(
        '#type' => 'button',
        '#value' => t('Preview changes'),
        '#weight' => 41,
      );

      // Change the form render callback to display the new button
      $form['#theme'] = 'diff_node_form';

      // Add a callback to handle showing the diff if requested.
      if (isset($form['#after_build']) && is_array($form['#after_build'])) {
        $form['#after_build'][] = 'diff_node_form_add_changes';
      }
      else {
        $form['#after_build'] = array(
          'diff_node_form_add_changes',
        );
      }
    }
  }
  elseif ($form_id == 'node_type_form' && isset($form['identity']['type'])) {

    // Node type edit form.
    // Add checkbox to activate 'Preview changes' button per node type.
    $form['workflow']['show_preview_changes'] = array(
      '#type' => 'checkbox',
      '#title' => t('Show %preview_changes button on node edit form', array(
        '%preview_changes' => t('Preview changes'),
      )),
      '#prefix' => '<strong>' . t('Preview changes') . '</strong>',
      '#weight' => 10,
      '#default_value' => variable_get('show_preview_changes_' . $form['#node_type']->type, TRUE),
    );
  }
}