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views_ui.module	27.95 KB	-rw-r--r--

Code Editor : views_ui.module

<?php

/**
 * @file
 * Provide structure for the administrative interface to Views.
 */

/**
 * Implements hook_menu().
 */
function views_ui_menu() {
  $items = array();

// Minor code reduction technique.
  $base = array(
    'access callback' => 'user_access',
    'access arguments' => array('administer views'),
    'file' => 'includes/admin.inc',
  );

// Top-level Views module pages (not tied to a particular View).
  $items['admin/structure/views/add'] = array(
    'title' => 'Add new view',
    'page callback' => 'views_ui_add_page',
    'type' => MENU_LOCAL_ACTION,
  ) + $base;

// Top-level Views module pages (not tied to a particular View).
  $items['admin/structure/views/add-template'] = array(
    'title' => 'Add view from template',
    'page callback' => 'views_ui_add_template_page',
    // Don't show a local action link if there aren't any templates.
    'type' => views_get_all_templates() ? MENU_LOCAL_ACTION : MENU_VISIBLE_IN_BREADCRUMB,
  ) + $base;

$items['admin/structure/views/import'] = array(
    'title' => 'Import',
    'page callback' => 'drupal_get_form',
    'page arguments' => array('views_ui_import_page'),
    'access callback' => 'views_import_access',
    'type' => MENU_LOCAL_ACTION,
  ) + $base;

$items['admin/structure/views/settings'] = array(
    'title' => 'Settings',
    'page callback' => 'drupal_get_form',
    'page arguments' => array('views_ui_admin_settings_basic'),
    'type' => MENU_LOCAL_TASK,
  ) + $base;
  $items['admin/structure/views/settings/basic'] = array(
    'title' => 'Basic',
    'page arguments' => array('views_ui_admin_settings_basic'),
    'type' => MENU_DEFAULT_LOCAL_TASK,
  ) + $base;
  $items['admin/structure/views/settings/advanced'] = array(
    'title' => 'Advanced',
    'page arguments' => array('views_ui_admin_settings_advanced'),
    'type' => MENU_LOCAL_TASK,
    'weight' => 1,
  ) + $base;

// The primary Edit View page. Secondary tabs for each Display are added in
  // views_ui_menu_local_tasks_alter().
  $items['admin/structure/views/view/%views_ui_cache'] = array(
    'title callback' => 'views_ui_edit_page_title',
    'title arguments' => array(4),
    'page callback' => 'views_ui_edit_page',
    'page arguments' => array(4),
  ) + $base;
  $items['admin/structure/views/view/%views_ui_cache/edit'] = array(
    'title' => 'Edit view',
    'type' => MENU_DEFAULT_LOCAL_TASK,
    'context' => MENU_CONTEXT_PAGE | MENU_CONTEXT_INLINE,
    'weight' => -10,
    'theme callback' => 'ajax_base_page_theme',
  ) + $base;
  $items['admin/structure/views/view/%views_ui_cache/edit/%/ajax'] = array(
    'page callback' => 'views_ui_ajax_get_form',
    'page arguments' => array('views_ui_edit_form', 4, 6),
    'delivery callback' => 'ajax_deliver',
    'theme callback' => 'ajax_base_page_theme',
    'type' => MENU_CALLBACK,
  ) + $base;
  $items['admin/structure/views/view/%views_ui_cache/preview/%'] = array(
    'page callback' => 'views_ui_build_preview',
    'page arguments' => array(4, 6),
    'context' => MENU_CONTEXT_PAGE | MENU_CONTEXT_INLINE,
    'type' => MENU_VISIBLE_IN_BREADCRUMB,
  ) + $base;
  $items['admin/structure/views/view/%views_ui_cache/preview/%/ajax'] = array(
    'page callback' => 'views_ui_build_preview',
    'page arguments' => array(4, 6),
    'delivery callback' => 'ajax_deliver',
    'theme callback' => 'ajax_base_page_theme',
    'type' => MENU_CALLBACK,
  ) + $base;

// Additional pages for acting on a View.

$items['admin/structure/views/view/%views_ui_cache/break-lock'] = array(
    'title' => 'Break lock',
    'page callback' => 'drupal_get_form',
    'page arguments' => array('views_ui_break_lock_confirm', 4),
    'type' => MENU_VISIBLE_IN_BREADCRUMB,
  ) + $base;

// NoJS/AJAX callbacks that can use the default Views AJAX form system.
  $items['admin/structure/views/nojs/%/%views_ui_cache'] = array(
    'page callback' => 'views_ui_ajax_form',
    'page arguments' => array(FALSE, 4, 5),
    'type' => MENU_CALLBACK,
  ) + $base;
  $items['admin/structure/views/ajax/%/%views_ui_cache'] = array(
    'page callback' => 'views_ui_ajax_form',
    'page arguments' => array(TRUE, 4, 5),
    'delivery callback' => 'ajax_deliver',
    'type' => MENU_CALLBACK,
  ) + $base;

// NoJS/AJAX callbacks that require custom page callbacks.
  $ajax_callbacks = array(
    'preview' => 'views_ui_preview',
  );
  foreach ($ajax_callbacks as $menu => $menu_callback) {
    $items['admin/structure/views/nojs/' . $menu . '/%views_ui_cache/%'] = array(
      'page callback' => $menu_callback,
      'page arguments' => array(5, 6),
    ) + $base;
    $items['admin/structure/views/ajax/' . $menu . '/%views_ui_cache/%'] = array(
      'page callback' => $menu_callback,
      'page arguments' => array(5, 6),
      'delivery callback' => 'ajax_deliver',
    ) + $base;
  }

// Autocomplete callback for tagging a View.
  // Views module uses admin/views/... instead of admin/structure/views/... for
  // autocomplete paths, so be consistent with that.
  // @todo Change to admin/structure/views/... when the change can be made to
  //   Views module as well.
  $items['admin/views/ajax/autocomplete/tag'] = array(
    'page callback' => 'views_ui_autocomplete_tag',
    'type' => MENU_CALLBACK,
  ) + $base;

// A page in the Reports section to show usage of fields in all views
  $items['admin/reports/fields/list'] = array(
    'title' => 'List',
    'type' => MENU_DEFAULT_LOCAL_TASK,
    'weight' => -10,
  );
  $items['admin/reports/fields/views-fields'] = array(
    'title' => 'Used in views',
    'description' => 'Overview of fields used in all views.',
    'page callback' => 'views_ui_field_list',
    'type' => MENU_LOCAL_TASK,
    'weight' => 0,
  ) + $base;

// A page in the Reports section to show usage of plugins in all views.
  $items['admin/reports/views-plugins'] = array(
    'title' => 'Views plugins',
    'description' => 'Overview of plugins used in all views.',
    'page callback' => 'views_ui_plugin_list',
  ) + $base;

return $items;
}

/**
 * Implements hook_theme().
 */
function views_ui_theme() {
  $path = drupal_get_path('module', 'views');
  require_once DRUPAL_ROOT . "/$path/includes/admin.inc";

return array(
    // edit a view
    'views_ui_display_tab_setting' => array(
      'variables' => array('description' => '', 'link' => '', 'settings_links' => array(), 'overridden' => FALSE, 'defaulted' => FALSE, 'description_separator' => TRUE, 'class' => array()),
      'template' => 'views-ui-display-tab-setting',
      'path' => "$path/theme",
    ),
    'views_ui_display_tab_bucket' => array(
      'render element' => 'element',
      'template' => 'views-ui-display-tab-bucket',
      'path' => "$path/theme",
    ),
    'views_ui_edit_item' => array(
      'variables' => array('type' => NULL, 'view' => NULL, 'display' => NULL, 'no_fields' => FALSE),
      'template' => 'views-ui-edit-item',
      'path' => "$path/theme",
    ),
    'views_ui_rearrange_form' => array(
      'render element' => 'form',
    ),
    'views_ui_rearrange_filter_form' => array(
      'render element' => 'form',
      'file' => 'includes/admin.inc',
    ),
    'views_ui_expose_filter_form' => array(
      'render element' => 'form',
      'file' => 'includes/admin.inc',
    ),

// list views
    'views_ui_view_info' => array(
      'variables' => array('view' => NULL, 'base' => NULL),
      'file' => "includes/admin.inc",
    ),

// Group of filters.
    'views_ui_build_group_filter_form' => array(
      'render element' => 'form',
      'file' => 'includes/admin.inc',
    ),

// tab themes
    'views_tabset' => array(
      'variables' => array('tabs' => NULL),
    ),
    'views_tab' => array(
      'variables' => array('body' => NULL),
    ),
    'views_ui_reorder_displays_form' => array(
      'render element' => 'form',
      'file' => 'includes/admin.inc',
    ),

// On behalf of a plugin
    'views_ui_style_plugin_table' => array(
      'render element' => 'form',
    ),

// When previewing a view.
    'views_ui_view_preview_section' => array(
      'variables' => array('view' => NULL, 'section' => NULL, 'content' => NULL, 'links' => ''),
    ),

// Generic container wrapper, to use instead of theme_container when an id
    // is not desired.
    'views_container' => array(
      'render element' => 'element',
      'file' => 'theme/theme.inc',
    ),
  );
}

/**
 * Impements hook_custom_theme()
 */
function views_ui_custom_theme() {
  $theme = variable_get('views_ui_custom_theme', '_default');

if ($theme != '_default') {
    $available = list_themes();

if (isset($available[$theme]) && $available[$theme]->status && preg_match('/^admin\/structure\/views/', current_path())) {
      return $theme;
    }
  }
}

/**
 * Page title callback for the Edit View page.
 */
function views_ui_edit_page_title($view) {
  module_load_include('inc', 'views_ui', 'includes/admin');
  $bases = views_fetch_base_tables();
  $name = $view->get_human_name();
  if (isset($bases[$view->base_table])) {
    $name .= ' (' . $bases[$view->base_table]['title'] . ')';
  }

return $name;
}

/**
 * Specialized menu callback to load a view and check its locked status.
 *
 * @param $name
 *   The machine name of the view.
 *
 * @return
 *   The view object, with a "locked" property indicating whether or not
 *   someone else is already editing the view.
 */
function views_ui_cache_load($name) {
  ctools_include('object-cache');
  views_include('view');
  $view = ctools_object_cache_get('view', $name);
  $original_view = views_get_view($name);

if (empty($view)) {
    $view = $original_view;
    if (!empty($view)) {
      // Check to see if someone else is already editing this view.
      $view->locked = ctools_object_cache_test('view', $view->name);
      // Set a flag to indicate that this view is being edited.
      // This flag will be used e.g. to determine whether strings
      // should be localized.
      $view->editing = TRUE;
    }
  }
  else {
    // Keep disabled/enabled status real.
    if ($original_view) {
      $view->disabled = !empty($original_view->disabled);
    }
  }

if (empty($view)) {
    return FALSE;
  }

else {
    return $view;
  }
}

/**
 * Specialized cache function to add a flag to our view, include an appropriate
 * include, and cache more easily.
 */
function views_ui_cache_set(&$view) {
  if (!empty($view->locked)) {
    drupal_set_message(t('Changes cannot be made to a locked view.'), 'error');
    return;
  }
  ctools_include('object-cache');
  $view->changed = TRUE; // let any future object know that this view has changed.

if (isset($view->current_display)) {
    // Add the knowledge of the changed display, too.
    $view->changed_display[$view->current_display] = TRUE;
    unset($view->current_display);
  }

// Unset handlers; we don't want to write these into the cache
  unset($view->display_handler);
  unset($view->default_display);
  $view->query = NULL;
  foreach (array_keys($view->display) as $id) {
    unset($view->display[$id]->handler);
    unset($view->display[$id]->default_display);
  }
  ctools_object_cache_set('view', $view->name, $view);
}

/**
 * Specialized menu callback to load a view that is only a default
 * view.
 */
function views_ui_default_load($name) {
  $view = views_get_view($name);
  if ($view->type == t('Default')) {
    return $view;
  }

return FALSE;
}

/**
 * Theme preprocess for views-view.tpl.php.
 */
function views_ui_preprocess_views_view(&$vars) {
  $view = $vars['view'];
  if (!empty($view->views_ui_context) && module_exists('contextual')) {
    $view->hide_admin_links = TRUE;
    foreach (array('title', 'header', 'exposed', 'rows', 'pager', 'more', 'footer', 'empty', 'attachment_after', 'attachment_before') as $section) {
      if (!empty($vars[$section])) {
        $vars[$section] = array(
          '#theme' => 'views_ui_view_preview_section',
          '#view' => $view,
          '#section' => $section,
          '#content' => is_array($vars[$section]) ? drupal_render($vars[$section]) : $vars[$section],
          '#theme_wrappers' => array('views_container'),
          '#attributes' => array('class' => 'contextual-links-region'),
        );
        $vars[$section] = drupal_render($vars[$section]);
      }
    }
  }
}

/**
 * Theme preprocess for theme_views_ui_view_preview_section().
 *
 * @TODO
 *    Perhaps move this to includes/admin.inc or theme/theme.inc
 */
function template_preprocess_views_ui_view_preview_section(&$vars) {
  switch ($vars['section']) {
    case 'title':
      $vars['title'] = t('Title');
      $links = views_ui_view_preview_section_display_category_links($vars['view'], 'title', $vars['title']);
      break;
    case 'header':
      $vars['title'] = t('Header');
      $links = views_ui_view_preview_section_handler_links($vars['view'], $vars['section']);
      break;
    case 'empty':
      $vars['title'] = t('No results behavior');
      $links = views_ui_view_preview_section_handler_links($vars['view'], $vars['section']);
      break;
    case 'exposed':
      // @todo Sorts can be exposed too, so we may need a better title.
      $vars['title'] = t('Exposed Filters');
      $links = views_ui_view_preview_section_display_category_links($vars['view'], 'exposed_form_options', $vars['title']);
      break;
    case 'rows':
      // @todo The title needs to depend on what is being viewed.
      $vars['title'] = t('Content');
      $links = views_ui_view_preview_section_rows_links($vars['view']);
      break;
    case 'pager':
      $vars['title'] = t('Pager');
      $links = views_ui_view_preview_section_display_category_links($vars['view'], 'pager_options', $vars['title']);
      break;
    case 'more':
      $vars['title'] = t('More');
      $links = views_ui_view_preview_section_display_category_links($vars['view'], 'use_more', $vars['title']);
      break;
    case 'footer':
      $vars['title'] = t('Footer');
      $links = views_ui_view_preview_section_handler_links($vars['view'], $vars['section']);
      break;
    case 'attachment_before':
      // @todo: Add links to the attachment configuration page.
      $vars['title'] = t('Attachment before');
      break;
    case 'attachment_after':
      // @todo: Add links to the attachment configuration page.
      $vars['title'] = t('Attachment after');
      break;
  }

if (isset($links)) {
    $build = array(
      '#prefix' => '<div class="contextual-links-wrapper">',
      '#suffix' => '</div>',
      '#theme' => 'links__contextual',
      '#links' => $links,
      '#attributes' => array('class' => array('contextual-links')),
      '#attached' => array(
        'library' => array(array('contextual', 'contextual-links')),
      ),
    );
    $vars['links'] = drupal_render($build);
  }
  $vars['theme_hook_suggestions'][] = 'views_ui_view_preview_section__' . $vars['section'];
}

/**
 * Returns the HTML for a section of a View being previewed within the Views UI.
 */
function theme_views_ui_view_preview_section($vars) {
  return '<h1 class="section-title">' . $vars['title'] . '</h1>'
  . $vars['links']
  . '<div class="preview-section">'. $vars['content'] . '</div>';
}

/**
 * Returns contextual links for each handler of a certain section.
 *
 * @TODO
 *   Bring in relationships
 *   Refactor this function to use much stuff of views_ui_edit_form_get_bucket.
 *
 * @param $title
 *   Add a bolded title of this section.
 */
function views_ui_view_preview_section_handler_links($view, $type, $title = FALSE) {
  $display = $view->display_handler->display;
  $handlers = $view->display_handler->get_handlers($type);
  $links = array();

$types = views_object_types();
  if ($title) {
    $links[$type . '-title'] = array(
      'title' => $types[$type]['title'],
    );
  }

foreach ($handlers as $id => $handler) {
    $field_name = $handler->ui_name(TRUE);
    $links[$type . '-edit-' . $id] = array(
      'title' => t('Edit @section', array('@section' => $field_name)),
      'href' => "admin/structure/views/nojs/config-item/$view->name/$display->id/$type/$id",
      'attributes' => array('class' => array('views-ajax-link')),
    );
  }
  $links[$type . '-add'] = array(
    'title' => t('Add new'),
    'href' => "admin/structure/views/nojs/add-item/$view->name/$display->id/$type",
    'attributes' => array('class' => array('views-ajax-link')),
  );

return $links;
}

/**
 * Returns a link to editing a certain display setting.
 */
function views_ui_view_preview_section_display_category_links($view, $type, $title) {
  $display = $view->display_handler->display;
  $links = array(
    $type . '-edit' => array(
      'title' => t('Edit @section', array('@section' => $title)),
      'href' => "admin/structure/views/nojs/display/$view->name/$display->id/$type",
      'attributes' => array('class' => array('views-ajax-link')),
    ),
  );

return $links;
}

/**
 * Returns all contextual links for the main content part of the view.
 */
function views_ui_view_preview_section_rows_links($view) {
  $display = $view->display_handler->display;
  $links = array();
  $links = array_merge($links, views_ui_view_preview_section_handler_links($view, 'filter', TRUE));
  $links = array_merge($links, views_ui_view_preview_section_handler_links($view, 'field', TRUE));
  $links = array_merge($links, views_ui_view_preview_section_handler_links($view, 'sort', TRUE));
  $links = array_merge($links, views_ui_view_preview_section_handler_links($view, 'argument', TRUE));
  $links = array_merge($links, views_ui_view_preview_section_handler_links($view, 'relationship', TRUE));

return $links;
}

/**
 * Implments hook_ctools_plugin_directory().
 *
 * Views UI provides wizard plugins on behalf of core base tables.
 */
function views_ui_ctools_plugin_directory($module, $plugin) {
  if ($module == 'views_ui' || ($module == 'ctools' && $plugin == 'export_ui')) {
    return 'plugins/' . $plugin;
  }
}

/**
 * Fetch metadata on a specific views ui wizard plugin.
 *
 * @param $wizard_type
 *   Name of a wizard, or name of a base table.
 *
 * @return
 *   An array with information about the requested wizard type.
 */
function views_ui_get_wizard($wizard_type) {
  ctools_include('plugins');
  $wizard = ctools_get_plugins('views_ui', 'views_wizard', $wizard_type);
  // @todo - handle this via an alter hook instead.
  if (!$wizard) {
    // Must be a base table using the default wizard plugin.
    $base_tables = views_fetch_base_tables();
    if (!empty($base_tables[$wizard_type])) {
      $wizard = views_ui_views_wizard_defaults();
      $wizard['base_table'] = $wizard_type;
      $wizard['title'] = $base_tables[$wizard_type]['title'];
    }
    // The plugin is neither a base table nor an existing wizard.
    else {
      vpr('Views Wizard: @wizard does not exist. Be sure to implement hook_ctools_plugin_directory.', array('@wizard' => $wizard_type));
    }
  }
  return $wizard;
}

/**
 * Fetch metadata for all content_type plugins.
 *
 * @return
 *   An array of arrays with information about all available views wizards.
 */
function views_ui_get_wizards() {
  ctools_include('plugins');
  $wizard_plugins = ctools_get_plugins('views_ui', 'views_wizard');
  $wizard_tables = array();
  foreach ($wizard_plugins as $name => $info) {
    $wizard_tables[$info['base_table']] = TRUE;
  }
  $base_tables = views_fetch_base_tables();
  $default_wizard = views_ui_views_wizard_defaults();
  // Find base tables with no wizard.
  // @todo - handle this via an alter hook for plugins?
  foreach ($base_tables as $table => $info) {
    if (!isset($wizard_tables[$table])) {
      $wizard = $default_wizard;
      $wizard['title'] = $info['title'];
      $wizard['base_table'] = $table;
      $wizard_plugins[$table] = $wizard;
    }
  }
  return $wizard_plugins;
}

/**
 * Helper function to define the default values for a Views wizard plugin.
 *
 * @return
 *   An array of defaults for a views wizard.
 */
function views_ui_views_wizard_defaults() {
  return array(
    // The children may, for example, be a different variant for each node type.
    'get children' => NULL,
    'get child' => NULL,
    // title and base table must be populated.  They are empty here just
    // so they are documented.
    'title' => '',
    'base_table' => NULL,
    // This is a callback that takes the wizard as argument and returns
    // an instantiazed Views UI form wizard object.
    'get_instance' => 'views_ui_get_form_wizard_instance',
    'form_wizard_class' => array(
      'file' => 'views_ui_base_views_wizard',
      'class' => 'ViewsUiBaseViewsWizard',
    ),
  );
}

/**
 * Inform CTools that the Views wizard plugin can have child plugins.
 */
function views_ui_ctools_plugin_type() {
  return array(
    'views_wizard' => array(
      'child plugins' => TRUE,
      'classes' => array(
        'form_wizard_class',
      ),
      'defaults' => views_ui_views_wizard_defaults(),
    ),
  );
}

/**
 * Implements hook_views_plugins_alter().
 */
function views_ui_views_plugins_alter(&$plugins) {
  // Attach contextual links to each display plugin. The links will point to
  // paths underneath "admin/structure/views/view/{$view->name}" (i.e., paths
  // for editing and performing other contextual actions on the view).
  foreach ($plugins['display'] as &$display) {
    $display['contextual links']['views_ui'] = array(
      'parent path' => 'admin/structure/views/view',
      'argument properties' => array('name'),
    );
  }
}

/**
 * Implements hook_contextual_links_view_alter().
 */
function views_ui_contextual_links_view_alter(&$element, $items) {
  // Remove contextual links from being rendered, when so desired, such as
  // within a View preview.
  if (views_ui_contextual_links_suppress()) {
    $element['#links'] = array();
  }
  // Append the display ID to the Views UI edit links, so that clicking on the
  // contextual link takes you directly to the correct display tab on the edit
  // screen.
  elseif (!empty($element['#links']['views-ui-edit']) && !empty($element['#element']['#views_contextual_links_info']['views_ui']['view_display_id'])) {
    $display_id = $element['#element']['#views_contextual_links_info']['views_ui']['view_display_id'];
    $element['#links']['views-ui-edit']['href'] .= '/' . $display_id;
  }
}

/**
 * Sets a static variable for controlling whether contextual links are rendered.
 *
 * @see views_ui_contextual_links_view_alter()
 */
function views_ui_contextual_links_suppress($set = NULL) {
  $suppress = &drupal_static(__FUNCTION__);
  if (isset($set)) {
    $suppress = $set;
  }
  return $suppress;
}

/**
 * Increments the views_ui_contextual_links_suppress() static variable.
 *
 * When this function is added to the #pre_render of an element, and
 * 'views_ui_contextual_links_suppress_pop' is added to the #post_render of the
 * same element, then all contextual links within the element and its
 * descendants are suppressed from being rendered. This is used, for example,
 * during a View preview, when it is not desired for nodes in the Views result
 * to have contextual links.
 *
 * @see views_ui_contextual_links_suppress_pop()
 */
function views_ui_contextual_links_suppress_push() {
  views_ui_contextual_links_suppress(((int) views_ui_contextual_links_suppress())+1);
}

/**
 * Decrements the views_ui_contextual_links_suppress() static variable.
 *
 * @see views_ui_contextual_links_suppress_push()
 */
function views_ui_contextual_links_suppress_pop() {
  views_ui_contextual_links_suppress(((int) views_ui_contextual_links_suppress())-1);
}

/**
 * Menu callback; handles AJAX form submissions similar to ajax_form_callback(), but can be used for uncached forms.
 *
 * ajax_form_callback(), the menu callback for the system/ajax path, requires
 * the form to be retrievable from the form cache, because it lacks a trusted
 * $form_id argument with which to call drupal_retrieve_form(). When AJAX is
 * wanted on a non-cacheable form, #ajax['path'] can be set to a path whose
 * menu router item's 'page callback' is this function, and whose
 * 'page arguments' is the form id, optionally followed by additional build
 * arguments, as expected by drupal_get_form().
 *
 * The same caution must be used when defining a hook_menu() entry with this
 * page callback as is used when defining a hook_menu() entry with the
 * 'drupal_get_form' page callback: a 'page arguments' must be specified with a
 * literal value as the first argument, because $form_id determines which form
 * builder function gets called, so must be safe from user tampering.
 *
 * @see drupal_get_form()
 * @see ajax_form_callback()
 * @see http://drupal.org/node/774876
 */
function views_ui_ajax_get_form($form_id) {
  // @see ajax_get_form()
  $form_state = array(
    'no_redirect' => TRUE,
  );
  $form_state['rebuild_info']['copy']['#build_id'] = TRUE;
  $form_state['rebuild_info']['copy']['#action'] = TRUE;

// @see drupal_get_form()
  $args = func_get_args();
  array_shift($args);
  $form_state['build_info']['args'] = $args;
  $form = drupal_build_form($form_id, $form_state);

// @see ajax_form_callback()
  if (!empty($form_state['triggering_element'])) {
    $callback = $form_state['triggering_element']['#ajax']['callback'];
  }
  if (!empty($callback) && function_exists($callback)) {
    return $callback($form, $form_state);
  }
}
// @todo move these when we can

/**
 * Helper function to get a list of paths assigned to a view.
 *
 * @param $view
 *   The view.
 *
 * @return
 *   An array of links to this view's display paths.
 */
function _views_ui_get_paths($view) {
  $all_paths = array();
  if (empty($view->display)) {
    $all_paths[] = t('Edit this view to add a display.');
  }
  else {
    $view->init_display();   // Make sure all the handlers are set up
    foreach ($view->display as $display) {
      if (!empty($display->handler) && $display->handler->has_path()) {
        $one_path = $display->handler->get_option('path');
        if (empty($path_sort)) {
          $path_sort = strtolower($one_path);
        }
        if (empty($view->disabled) && strpos($one_path, '%') === FALSE) {
          $all_paths[] = l('/' . $one_path, $one_path);
        }
        else {
          $all_paths[] = check_plain('/' . $one_path);
        }
      }
    }
  }

return array_unique($all_paths);
}

/**
 * Helper function to get a list of displays included in a view.
 *
 * @param $view
 *   The view.
 *
 * @return
 *   An array of display types that this view includes.
 */
function _views_ui_get_displays_list($view) {
  $displays = array();
  foreach ($view->display as $display) {
    if (!empty($display->handler->definition['admin'])) {
      $displays[$display->handler->definition['admin']] = TRUE;
    }
  }

if ($displays) {
    ksort($displays);
    $displays = array_keys($displays);
  }
  return $displays;
}

/**
 * This is part of a patch to address a jQueryUI bug.  The bug is responsible
 * for the inability to scroll a page when a modal dialog is active. If the content
 * of the dialog extends beyond the bottom of the viewport, the user is only able
 * to scroll with a mousewheel or up/down keyboard keys.
 *
 * @see http://bugs.jqueryui.com/ticket/4671
 * @see https://bugs.webkit.org/show_bug.cgi?id=19033
 * @see /js/jquery.ui.dialog.patch.js
 * @see /js/jquery.ui.dialog.min.js
 *
 * The javascript patch overwrites the $.ui.dialog.overlay.events object to remove
 * the mousedown, mouseup and click events from the list of events that are bound
 * in $.ui.dialog.overlay.create.
 */

function views_ui_library_alter(&$libraries, $module) {
  if ($module == 'system' && isset($libraries['ui.dialog'])) {
    // Only apply the fix, if we don't have an up to date jQueryUI version.
    if (version_compare($libraries['ui.dialog']['version'], '1.7.2', '>=') && version_compare($libraries['ui.dialog']['version'], '1.10.0', '<')) {
      $libraries['ui.dialog']['js'][drupal_get_path('module', 'views') . '/js/jquery.ui.dialog.patch.js'] = array();
    }
  }
}

/**
 * Truncate strings to a set length and provide a ... if they truncated.
 *
 * This is often used in the UI to ensure long strings fit.
 */
function views_ui_truncate($string, $length) {
  if (drupal_strlen($string) > $length) {
    $string = drupal_substr($string, 0, $length);
    $string .= '...';
  }

return $string;
}

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Code Editor : views_ui.module