noverwrite.php

<?php

require_once 'noverwrite.civix.php';

function noverwrite_civicrm_buildForm ( $formName, &$form ){
  $names = array ("CRM_Profile_Form_Edit","CRM_Event_Form_Registration_Register","CRM_Contribute_Form_Contribution_Main");

  if (!in_array ($formName, $names))
    return;
  $session = CRM_Core_Session::singleton();
  if (!$session->get('userID') && !array_key_exists("cs",$_GET)) {
    return; // anonymous user, nothing to bloc
  }
  foreach (array( 'first_name', 'last_name') as $f) {
    if (!$form->elementExists($f)) {
      continue;
    }
    $field=$form->getElement($f);
    if ($field && $field->_attributes["value"])
      $form->freeze( $f );
  }
  // if you want to bloc it at the js level only, uncomment the next line and comment out the freeze
  // CRM_Core_Resources::singleton()->addScript(file_get_contents(dirname( __FILE__ ) ."/js/noverwrite.js"));
}

/**
 * Implementation of hook_civicrm_config
 */
function noverwrite_civicrm_config(&$config) {
  _noverwrite_civix_civicrm_config($config);
}

/**
 * Implementation of hook_civicrm_xmlMenu
 *
 * @param $files array(string)
 */
function noverwrite_civicrm_xmlMenu(&$files) {
  _noverwrite_civix_civicrm_xmlMenu($files);
}

/**
 * Implementation of hook_civicrm_install
 */
function noverwrite_civicrm_install() {
  return _noverwrite_civix_civicrm_install();
}

/**
 * Implementation of hook_civicrm_uninstall
 */
function noverwrite_civicrm_uninstall() {
  return _noverwrite_civix_civicrm_uninstall();
}

/**
 * Implementation of hook_civicrm_enable
 */
function noverwrite_civicrm_enable() {
  return _noverwrite_civix_civicrm_enable();
}

/**
 * Implementation of hook_civicrm_disable
 */
function noverwrite_civicrm_disable() {
  return _noverwrite_civix_civicrm_disable();
}

/**
 * Implementation of hook_civicrm_upgrade
 *
 * @param $op string, the type of operation being performed; 'check' or 'enqueue'
 * @param $queue CRM_Queue_Queue, (for 'enqueue') the modifiable list of pending up upgrade tasks
 *
 * @return mixed  based on op. for 'check', returns array(boolean) (TRUE if upgrades are pending)
 *                for 'enqueue', returns void
 */
function noverwrite_civicrm_upgrade($op, CRM_Queue_Queue $queue = NULL) {
  return _noverwrite_civix_civicrm_upgrade($op, $queue);
}

/**
 * Implementation of hook_civicrm_managed
 *
 * Generate a list of entities to create/deactivate/delete when this module
 * is installed, disabled, uninstalled.
 */
function noverwrite_civicrm_managed(&$entities) {
  return _noverwrite_civix_civicrm_managed($entities);
}