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Drupal example source code file (trigger.admin.inc)

This example Drupal source code file (trigger.admin.inc) is included in the DevDaily.com "Drupal Source Code Warehouse" project. The intent of this project is to help you "Learn Drupal by Example".

PHP - Drupal tags/keywords

actions, aid, array, foreach, form, function, hook, if, label, module, php, trigger, type, value

The trigger.admin.inc Drupal example source code

<?php
// $Id: trigger.admin.inc,v 1.30 2010/10/20 16:19:24 webchick Exp $

/**
 * @file
 * Admin page callbacks for the trigger module.
 */

/**
 * Builds the form that allows users to assign actions to triggers.
 *
 * @param $module_to_display
 *   Which tab of triggers to display. E.g., 'node' for all
 *   node-related triggers.
 * @return
 *   HTML form.
 */
function trigger_assign($module_to_display = NULL) {
  // If no type is specified we default to node actions, since they
  // are the most common.
  if (!isset($module_to_display)) {
    drupal_goto('admin/structure/trigger/node');
  }

  $build = array();
  $trigger_info = module_invoke_all('trigger_info');
  drupal_alter('trigger_info', $trigger_info);
  foreach ($trigger_info as $module => $hooks) {
    if ($module == $module_to_display) {
      foreach ($hooks as $hook => $description) {
        $form_id = 'trigger_' . $hook . '_assign_form';
        $build[$form_id] = drupal_get_form($form_id, $module, $hook, $description['label']);
      }
    }
  }
  return $build;
}

/**
 * Confirm removal of an assigned action.
 *
 * @param $module
 *   The tab of triggers the user will be directed to after successful
 *   removal of the action, or if the confirmation form is cancelled.
 * @param $hook
 * @param $aid
 *   The action ID.
 * @ingroup forms
 * @see trigger_unassign_submit()
 */
function trigger_unassign($form, $form_state, $module, $hook = NULL, $aid = NULL) {
  if (!($hook && $aid)) {
    drupal_goto('admin/structure/trigger');
  }

  $form['hook'] = array(
    '#type' => 'value',
    '#value' => $hook,
  );
  $form['module'] = array(
    '#type' => 'value',
    '#value' => $module,
  );
  $form['aid'] = array(
    '#type' => 'value',
    '#value' => $aid,
  );

  $action = actions_function_lookup($aid);
  $actions = actions_get_all_actions();

  $destination = 'admin/structure/trigger/' . $module;

  return confirm_form($form,
    t('Are you sure you want to unassign the action %title?', array('%title' => $actions[$action]['label'])),
    $destination,
    t('You can assign it again later if you wish.'),
    t('Unassign'), t('Cancel')
  );
}

/**
 * Submit callback for trigger_unassign() form.
 */
function trigger_unassign_submit($form, &$form_state) {
  if ($form_state['values']['confirm'] == 1) {
    $aid = actions_function_lookup($form_state['values']['aid']);
    db_delete('trigger_assignments')
      ->condition('hook', $form_state['values']['hook'])
      ->condition('aid', $aid)
      ->execute();
    $actions = actions_get_all_actions();
    watchdog('actions', 'Action %action has been unassigned.',  array('%action' => $actions[$aid]['label']));
    drupal_set_message(t('Action %action has been unassigned.', array('%action' => $actions[$aid]['label'])));
    $form_state['redirect'] = 'admin/structure/trigger/' . $form_state['values']['module'];
  }
  else {
    drupal_goto('admin/structure/trigger');
  }
}

/**
 * Returns the form for assigning an action to a trigger.
 *
 * @param $module
 *   The name of the trigger group, e.g., 'node'.
 * @param $hook
 *   The name of the trigger hook, e.g., 'node_insert'.
 * @param $label
 *   A plain English description of what this trigger does.
 *
 * @ingoup forms
 * @see trigger_assign_form_validate()
 * @see trigger_assign_form_submit()
 */
function trigger_assign_form($form, $form_state, $module, $hook, $label) {
  $form['module'] = array(
    '#type' => 'hidden',
    '#value' => $module,
  );
  $form['hook'] = array(
    '#type' => 'hidden',
    '#value' => $hook,
  );
  // All of these forms use the same validate and submit functions.
  $form['#validate'][] = 'trigger_assign_form_validate';
  $form['#submit'][] = 'trigger_assign_form_submit';

  $options = array();
  $functions = array();
  // Restrict the options list to actions that declare support for this hook.
  foreach (actions_list() as $func => $metadata) {
    if (isset($metadata['triggers']) && array_intersect(array($hook, 'any'), $metadata['triggers'])) {
      $functions[] = $func;
    }
  }
  foreach (actions_actions_map(actions_get_all_actions()) as $aid => $action) {
    if (in_array($action['callback'], $functions)) {
      $options[$action['type']][$aid] = $action['label'];
    }
  }

  $form[$hook] = array(
    '#type' => 'fieldset',
    // !description is correct, since these labels are passed through t() in
    // hook_trigger_info().
    '#title' => t('Trigger: !description', array('!description' => $label)),
    '#theme' => 'trigger_display',
  );

  // Retrieve actions that are already assigned to this hook combination.
  $actions = trigger_get_assigned_actions($hook);
  $form[$hook]['assigned']['#type'] = 'value';
  $form[$hook]['assigned']['#value'] = array();
  foreach ($actions as $aid => $info) {
    // If action is defined unassign it, otherwise offer to delete all orphaned
    // actions.
    $hash = drupal_hash_base64($aid, TRUE);
    if (actions_function_lookup($hash)) {
      $form[$hook]['assigned']['#value'][$aid] = array(
        'label' => $info['label'],
        'link' => l(t('unassign'), "admin/structure/trigger/unassign/$module/$hook/$hash"),
      );
    }
    else {
      // Link to system_actions_remove_orphans() to do the clean up.
      $form[$hook]['assigned']['#value'][$aid] = array(
        'label' => $info['label'],
        'link' => l(t('Remove orphaned actions'), "admin/config/system/actions/orphan"),
      );
    }
  }

  $form[$hook]['parent'] = array(
    '#type' => 'container',
    '#attributes' => array('class' => array('container-inline')),
  );
  // List possible actions that may be assigned.
  if (count($options) != 0) {
    $form[$hook]['parent']['aid'] = array(
      '#type' => 'select',
      '#title' => t('List of trigger actions when !description', array('!description' => $label)),
      '#title_display' => 'invisible',
      '#options' => $options,
      '#empty_option' => t('Choose an action'),
    );
    $form[$hook]['parent']['submit'] = array(
      '#type' => 'submit',
      '#value' => t('Assign')
    );
  }
  else {
    $form[$hook]['none'] = array(
      '#markup' => t('No actions available for this trigger. <a href="@link">Add action</a>.', array('@link' => url('admin/config/system/actions/manage')))
    );
  }
  return $form;
}

/**
 * Validation function for trigger_assign_form().
 *
 * Makes sure that the user is not re-assigning an action to an event.
 */
function trigger_assign_form_validate($form, $form_state) {
  $form_values = $form_state['values'];
  if (!empty($form_values['aid'])) {
    $aid = actions_function_lookup($form_values['aid']);
    $aid_exists = db_query("SELECT aid FROM {trigger_assignments} WHERE hook = :hook AND aid = :aid", array(
      ':hook' => $form_values['hook'],
      ':aid' => $aid,
    ))->fetchField();
    if ($aid_exists) {
      form_set_error($form_values['hook'], t('The action you chose is already assigned to that trigger.'));
    }
  }
}

/**
 * Submit function for trigger_assign_form().
 */
function trigger_assign_form_submit($form, &$form_state) {
  if (!empty($form_state['values']['aid'])) {
    $aid = actions_function_lookup($form_state['values']['aid']);
    $weight = db_query("SELECT MAX(weight) FROM {trigger_assignments} WHERE hook = :hook", array(':hook' => $form_state['values']['hook']))->fetchField();

    // Insert the new action.
    db_insert('trigger_assignments')
      ->fields(array(
        'hook' => $form_state['values']['hook'],
        'aid' => $aid,
        'weight' => $weight + 1,
      ))
      ->execute();

    // If we are not configuring an action for a "presave" hook and this action
    // changes an object property, then we need to save the object, so the
    // property change will persist.
    $actions = actions_list();
    if (strpos($form_state['values']['hook'], 'presave') === FALSE && isset($actions[$aid]['behavior']) && in_array('changes_property', $actions[$aid]['behavior'])) {
      // Determine the corresponding save action name for this action.
      $save_action = strtok($aid, '_') . '_save_action';
      // If no corresponding save action exists, we need to bail out.
      if (!isset($actions[$save_action])) {
        throw new Exception(t('Missing/undefined save action (%save_aid) for %aid action.', array('%save_aid' => $aid, '%aid' => $aid)));
      }
      // Delete previous save action if it exists, and re-add it using a higher
      // weight.
      $save_action_assigned = db_query("SELECT aid FROM {trigger_assignments} WHERE hook = :hook AND aid = :aid", array(':hook' => $form_state['values']['hook'], ':aid' => $save_action))->fetchField();

      if ($save_action_assigned) {
        db_delete('trigger_assignments')
          ->condition('hook', $form_state['values']['hook'])
          ->condition('aid', $save_action)
          ->execute();
      }
      db_insert('trigger_assignments')
        ->fields(array(
          'hook' => $form_state['values']['hook'],
          'aid' => $save_action,
          'weight' => $weight + 2,
        ))
        ->execute();

      // If no save action existed before, inform the user about it.
      if (!$save_action_assigned) {
        drupal_set_message(t('The %label action has been appended, which is required to save the property change.', array('%label' => $actions[$save_action]['label'])));
      }
      // Otherwise, just inform about the new weight.
      else {
        drupal_set_message(t('The %label action was moved to save the property change.', array('%label' => $actions[$save_action]['label'])));
      }
    }
  }
}

/**
 * Returns HTML for the form showing actions assigned to a trigger.
 *
 * @param $variables
 *   An associative array containing:
 *   - element: The fieldset including all assigned actions.
 *
 * @ingroup themeable
 */
function theme_trigger_display($variables) {
  $element = $variables['element'];

  $header = array();
  $rows = array();
  if (isset($element['assigned']) && count($element['assigned']['#value'])) {
    $header = array(array('data' => t('Name')), array('data' => t('Operation')));
    $rows = array();
    foreach ($element['assigned']['#value'] as $aid => $info) {
      $rows[] = array(
        check_plain($info['label']),
        $info['link']
      );
    }
  }

  if (count($rows)) {
    $output = theme('table', array('header' => $header, 'rows' => $rows)) . drupal_render_children($element);
  }
  else {
    $output = drupal_render_children($element);
  }
  return $output;
}

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