materio-base-d7/sites/all/modules/gui/materiobasemod/materio_showroom.module

<?php

// TODO: alter entity translation field permission with field_permission

//     __                     __  _                _______      __    __
//    / /   ____  _________ _/ /_(_)___  ____     / ____(_)__  / /___/ /
//   / /   / __ \/ ___/ __ `/ __/ / __ \/ __ \   / /_  / / _ \/ / __  /
//  / /___/ /_/ / /__/ /_/ / /_/ / /_/ / / / /  / __/ / /  __/ / /_/ /
// /_____/\____/\___/\__,_/\__/_/\____/_/ /_/  /_/   /_/\___/_/\__,_/

/**
 * Implements hook_field_info().
 *
 * Provides the description of the field.
 */
function materio_showroom_field_info() {
  return array(
    // We name our field as the associative name of the array.
    'field_materio_showroom_location' => array(
      'label' => t('Showroom Location'),
      'description' => t('Define material location by showroom'),
      'default_widget' => 'materio_showroom_location_text',
      'default_formatter' => 'materio_showroom_location_simple_text',
    ),
  );

  // TODO: define in settings wich vocabulary is for showrooms

}

/**
 * Implements hook_field_validate().
 *
 * This hook gives us a chance to validate content that's in our
 * field. We're really only interested in the $items parameter, since
 * it holds arrays representing content in the field we've defined.
 * We want to verify that the items only contain RGB hex values like
 * this: #RRGGBB. If the item validates, we do nothing. If it doesn't
 * validate, we add our own error notification to the $errors parameter.
 *
 * @see field_example_field_widget_error()
 */
// function materio_showroom_field_validate($entity_type, $entity, $field, $instance, $langcode, $items, &$errors) {
//   foreach ($items as $delta => $item) {
//     // if (!empty($item['rgb'])) {
//     //   if (!preg_match('@^#[0-9a-f]{6}$@', $item['rgb'])) {
//     //     $errors[$field['field_name']][$langcode][$delta][] = array(
//     //       'error' => 'field_example_invalid',
//     //       'message' => t('Color must be in the HTML format #abcdef.'),
//     //     );
//     //   }
//     // }
//   }
// }

/**
 * Implements hook_field_is_empty().
 *
 * hook_field_is_empty() is where Drupal asks us if this field is empty.
 * Return TRUE if it does not contain data, FALSE if it does. This lets
 * the form API flag an error when required fields are empty.
 */
function materio_showroom_field_is_empty($item, $field) {
  // dsm($item,'item');
  // dsm($field,'field');
  return empty($item['location']) && empty($item['showroom_tid']);
}

//     ______                           __
//    / ____/___  _________ ___  ____ _/ /____  __________
//   / /_  / __ \/ ___/ __ `__ \/ __ `/ __/ _ \/ ___/ ___/
//  / __/ / /_/ / /  / / / / / / /_/ / /_/  __/ /  (__  )
// /_/    \____/_/  /_/ /_/ /_/\__,_/\__/\___/_/  /____/

/**
 * Implements hook_field_formatter_info().
 *
 * We need to tell Drupal that we have two different types of formatters
 * for this field. One will change the text color, and the other will
 * change the background color.
 *
 * @see field_example_field_formatter_view()
 */
function materio_showroom_field_formatter_info() {
  return array(
    // This formatter just displays the hex value in the color indicated.
    'materio_showroom_location_simple_text' => array(
      'label' => t('Simple text-based formatter'),
      'field types' => array('field_example_rgb'),
    ),
    // This formatter changes the background color of the content region.
    // 'field_example_color_background' => array(
    //   'label' => t('Change the background of the output text'),
    //   'field types' => array('field_example_rgb'),
    // ),
  );
}


/**
 * Implements hook_field_formatter_view().
 *
 * Two formatters are implemented.
 * - field_example_simple_text just outputs markup indicating the color that
 *   was entered and uses an inline style to set the text color to that value.
 * - field_example_color_background does the same but also changes the
 *   background color of div.region-content.
 *
 * @see field_example_field_formatter_info()
 */
function materio_showroom_field_formatter_view($entity_type, $entity, $field, $instance, $langcode, $items, $display) {
  $element = array();

  switch ($display['type']) {
    // This formatter simply outputs the field as text and with a color.
    case 'materio_showroom_location_simple_text':
      foreach ($items as $delta => $item) {
        $element[$delta] = array(
          '#type' => 'html_tag',
          '#tag' => 'p',
          '#value' => t('@loc', array('@loc' => $item['location'])),
        );
      }
      break;
  }

  return $element;
}

//  _       ___     __           __
// | |     / (_)___/ /___ ____  / /______
// | | /| / / / __  / __ `/ _ \/ __/ ___/
// | |/ |/ / / /_/ / /_/ /  __/ /_(__  )
// |__/|__/_/\__,_/\__, /\___/\__/____/
//                /____/


/**
 * Implements hook_field_widget_info().
 *
 * Three widgets are provided.
 * - A simple text-only widget where the user enters the '#ffffff'.
 * - A 3-textfield widget that gathers the red, green, and blue values
 *   separately.
 * - A farbtastic colorpicker widget that chooses the value graphically.
 *
 * These widget types will eventually show up in hook_field_widget_form,
 * where we will have to flesh them out.
 *
 * @see field_example_field_widget_form()
 */
function materio_showroom_field_widget_info() {
  return array(
    'materio_showroom_location_text' => array(
      'label' => t('Location as text'),
      'field types' => array('field_materio_showroom_location'),
    ),
  );
}


/**
 * Implements hook_field_widget_form().
 *
 * hook_widget_form() is where Drupal tells us to create form elements for
 * our field's widget.
 *
 * We provide one of three different forms, depending on the widget type of
 * the Form API item provided.
 *
 * The 'field_example_colorpicker' and 'field_example_text' are essentially
 * the same, but field_example_colorpicker adds a javascript colorpicker
 * helper.
 *
 * field_example_3text displays three text fields, one each for red, green,
 * and blue. However, the field type defines a single text column,
 * rgb, which needs an HTML color spec. Define an element validate
 * handler that converts our r, g, and b fields into a simulated single
 * 'rgb' form element.
 */
function materio_showroom_field_widget_form(&$form, &$form_state, $field, $instance, $langcode, $items, $delta, $element) {
  $locval = isset($items[$delta]['location']) ? $items[$delta]['location'] : '';
  $showroom_tid = isset($items[$delta]['showroom_tid']) ? $items[$delta]['showroom_tid'] : 0;

  $widget = $element;
  $widget['#delta'] = $delta;

  switch ($instance['widget']['type']) {
 // TODO: loop through showrooms and don't allow more than one field by show room

    case 'materio_showroom_location_text':

      $widget['showroom_tid'] = array(
        '#type' => 'hidden',
        '#default_value' => $showroom_tid,
        // Allow a slightly larger size that the field length to allow for some
        // configurations where all characters won't fit in input field.
        '#size' => 10,
        '#maxlength' => 10,
      );

      $widget['location'] = array(
        '#type' => 'textfield',
        '#title' => "Showroom", //$showroom_term->name,
        '#default_value' => $locval,
        // Allow a slightly larger size that the field length to allow for some
        // configurations where all characters won't fit in input field.
        '#size' => 10,
        '#maxlength' => 10,
      );

      break;
  }

  return $widget;
}


/**
 * Implements hook_field_widget_settings_form().
 */
function materio_showroom_field_widget_settings_form($field, $instance) {
  $widget = $instance['widget'];
  $settings = $widget['settings'];

  $vocs = taxonomy_get_vocabularies();
  $options = array();
  foreach ($vocs as $vid => $voc) {
    $options[$vid] = $voc->name;
  }

  $form['vocabulary'] = array(
    '#type' => 'select',
    '#title' => t('Vocabulary'),
    '#default_value' => $settings['vocabulary'],
    // '#element_validate' => array('_tode_widget_settings_maxlength_validate'),
    '#required' => TRUE,
    '#description' => t('Choose which vocabulary will be associated as showroom.'),
    '#options' => $options,
  );

  return $form;
}

/**
 * Implements hook_form_alter().
 */
function materio_showroom_form_field_ui_field_edit_form_alter(&$form, &$form_state, $form_id) {
  if($form['#field']['type'] == "field_materio_showroom_location"){
    // dsm($form, 'form');
    $form['field']['cardinality']['#disabled'] = 'true';
    $form['field']['cardinality']['#default_value'] = -1;
  }
  //
}

/**
 * Implements hook_form_alter().
 */
function materio_showroom_form_alter(&$form, &$form_state, $form_id) {
  // act only on node edit form
  if(isset($form['#node_edit_form'])){
    // dsm($form_id, 'form_id');
    // dsm($form, 'form');
    // dsm($form_state, 'form_state');

    _materio_showroom_alter_location_field_form($form, $form_state, $form_id);
  }
}

function _materio_showroom_alter_location_field_form(&$form, &$form_state, $form_id){
  // define some constants
  $field_type = 'field_materio_showroom_location';
  $node = $form['#node'];
  $nodetype = $form['type']['#value'];

  global $user;
  $user = user_load($user->uid); // Make sure the user object is fully loaded
  // dsm($user, 'user');

  $fieldsmap = field_info_field_map();
  $showroomfieldinstances = array();
  $user_termref_field_instances = array();
  foreach ($fieldsmap as $field_name => $field) {
    // dsm($field,$field_name);
    // get all (probably one :p) showroom field instances from the current node
    if ($field['type'] == $field_type
        && isset($field['bundles']['node'])
        && in_array($nodetype, $field['bundles']['node'])) {
      $showroomfieldinstances[] = $field_name;
    }
    // get all term reference fields instance from users
    if (isset($field['bundles']['user'])
        && $field['type'] == 'taxonomy_term_reference') {
      $field_info = field_info_field($field_name);
      // dsm($field_info, "field_info");
      $user_termref_field_instances[$field_info['settings']['allowed_values'][0]['vocabulary']] = $field_name;
    }
  }
  // dsm($showroomfieldinstances, 'showroomfieldinstances');
  // dsm($user_termref_field_instances, 'user_termref_field_instances');

  // if there is no showroom field instances do nothing
  if(!empty($showroomfieldinstances)){
    // act on each field instance
    foreach ($showroomfieldinstances as $field_name) {
      // retrive various field infos
      $field_info = field_info_field($field_name);
      $field_instance = field_info_instance('node', $field_name, $nodetype);
      // dsm($field_info, 'field_info');

      // get all terms from chosen vocabulary in field instance widget settings
      $vid = $field_instance['widget']['settings']['vocabulary'];
      $voc = taxonomy_vocabulary_load($vid);
      $tree = taxonomy_get_tree($vid);
      foreach ($tree as $key => $term) {
        $terms[$term->tid] = $term->name;
      }
      // dsm($terms, 'terms');

      // get user own term for current vocabulary (if any)
      if(isset($user_termref_field_instances[$voc->machine_name])){
        $user_field_name = $user_termref_field_instances[$voc->machine_name];
        foreach (field_get_items('user', $user, $user_field_name) as $key => $value) {
          $user_showrooms[] = $value['tid'];
        }
        // dsm($user_showrooms, "user_showrooms");
      }

      // get already recorded values
      $old_items = field_get_items('node', $node, $field_name);
      foreach ($old_items as $i => $value) {
        $values[$value['showroom_tid']] = $value['location'];
      }
      // dsm($values, 'values');

      // build new item list
      foreach ($terms as $tid => $name) {
        $items[] = array(
          'showroom_tid' => $tid,
          'location' => isset($values[$tid]) ? $values[$tid] : ''
        );
      }
      // dsm($items, 'items');

      // retrieve new field form with our custom items
      $new_field_form = field_default_form('node', $node, $field_info, $field_instance, LANGUAGE_NONE, $items, $form, $form_state);
      // dsm($new_field_form, 'default_form');

      // change items location field title
      // and check access comparing term id with user taged with
      $i = 0;
      foreach ($terms as $tid => $name) {
        $item = $new_field_form[$field_name][LANGUAGE_NONE][$i];
        $new_field_form[$field_name][LANGUAGE_NONE][$i]['location']['#title'] = $terms[$item['showroom_tid']['#default_value']];
        $new_field_form[$field_name][LANGUAGE_NONE][$i]['location']['#disabled'] = !in_array($tid, $user_showrooms);
        $i++;
      }

      // remove the last one more item added by default
      unset($new_field_form[$field_name][LANGUAGE_NONE][$i]);

      // delete normal field form and replace it with our new custom field form
      unset($form[$field_name]);
      $form[$field_name] = $new_field_form[$field_name];

      // remove "add more" button
      unset($form[$field_name]['und']['add_more']);
    }
  }
}

// TODO: migrate old location field to new one