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class views_plugin_display_feed in Views (for Drupal 7) 6.2

Same name and namespace in other branches
  1. 6.3 plugins/views_plugin_display_feed.inc \views_plugin_display_feed
  2. 7.3 plugins/views_plugin_display_feed.inc \views_plugin_display_feed

The plugin that handles a feed, such as RSS or atom.

For the most part, feeds are page displays but with some subtle differences.

Hierarchy

Expanded class hierarchy of views_plugin_display_feed

Related topics

Views' display plugins
Display plugins control how Views interact with the rest of Drupal.
1 string reference to 'views_plugin_display_feed'
views_views_plugins in includes/plugins.inc
Implementation of hook_views_plugins

File

plugins/views_plugin_display_feed.inc, line 14
Contains the feed display plugin.

View source 
class views_plugin_display_feed extends views_plugin_display_page {
  function uses_breadcrumb() {
    return FALSE;
  }
  function get_style_type() {
    return 'feed';
  }

  /**
   * Feeds do not go through the normal page theming mechanism. Instead, they
   * go through their own little theme function and then return NULL so that
   * Drupal believes that the page has already rendered itself...which it has.
   */
  function execute() {
    $output = $this->view
      ->render();
    if (empty($output)) {
      return drupal_not_found();
    }
    print $output;
  }
  function preview() {
    if (!empty($this->view->live_preview)) {
      return '<pre>' . check_plain($this->view
        ->render()) . '</pre>';
    }
    return $this->view
      ->render();
  }

  /**
   * Instead of going through the standard views_view.tpl.php, delegate this
   * to the style handler.
   */
  function render() {
    return $this->view->style_plugin
      ->render($this->view->result);
  }
  function defaultable_sections($section = NULL) {
    if (in_array($section, array(
      'style_options',
      'style_plugin',
      'row_options',
      'row_plugin',
    ))) {
      return FALSE;
    }
    $sections = parent::defaultable_sections($section);

    // Tell views our sitename_title option belongs in the title section.
    if ($section == 'title') {
      $sections[] = 'sitename_title';
    }
    elseif (!$section) {
      $sections['title'][] = 'sitename_title';
    }
    return $sections;
  }
  function option_definition() {
    $options = parent::option_definition();
    $options['displays'] = array(
      'default' => array(),
    );

    // Overrides for standard stuff:
    $options['style_plugin']['default'] = 'rss';
    $options['style_options']['default'] = array(
      'mission_description' => FALSE,
      'description' => '',
    );
    $options['sitename_title']['default'] = FALSE;
    $options['row_plugin']['default'] = '';
    $options['defaults']['default']['style_plugin'] = FALSE;
    $options['defaults']['default']['style_options'] = FALSE;
    $options['defaults']['default']['row_plugin'] = FALSE;
    $options['defaults']['default']['row_options'] = FALSE;
    return $options;
  }
  function options_summary(&$categories, &$options) {

    // It is very important to call the parent function here:
    parent::options_summary($categories, $options);

    // Since we're childing off the 'page' type, we'll still *call* our
    // category 'page' but let's override it so it says feed settings.
    $categories['page'] = array(
      'title' => t('Feed settings'),
    );
    if ($this
      ->get_option('sitename_title')) {
      $options['title']['value'] = t('Using the site name');
    }

    // I don't think we want to give feeds menus directly.
    unset($options['menu']);
    $displays = array_filter($this
      ->get_option('displays'));
    if (count($displays) > 1) {
      $attach_to = t('Multiple displays');
    }
    else {
      if (count($displays) == 1) {
        $display = array_shift($displays);
        if (!empty($this->view->display[$display])) {
          $attach_to = check_plain($this->view->display[$display]->display_title);
        }
      }
    }
    if (!isset($attach_to)) {
      $attach_to = t('None');
    }
    $options['displays'] = array(
      'category' => 'page',
      'title' => t('Attach to'),
      'value' => $attach_to,
    );
  }

  /**
   * Provide the default form for setting options.
   */
  function options_form(&$form, &$form_state) {

    // It is very important to call the parent function here.
    parent::options_form($form, $form_state);
    switch ($form_state['section']) {
      case 'title':
        $title = $form['title'];

        // A little juggling to move the 'title' field beyond our checkbox.
        unset($form['title']);
        $form['sitename_title'] = array(
          '#type' => 'checkbox',
          '#title' => t('Use the site name for the title'),
          '#default_value' => $this
            ->get_option('sitename_title'),
        );
        $form['title'] = $title;
        $form['title']['#process'] = array(
          'views_process_dependency',
        );
        $form['title']['#dependency'] = array(
          'edit-sitename-title' => array(
            FALSE,
          ),
        );
        break;
      case 'displays':
        $form['#title'] .= t('Attach to');
        $displays = array();
        foreach ($this->view->display as $display_id => $display) {
          if (!empty($display->handler) && $display->handler
            ->accept_attachments()) {
            $displays[$display_id] = $display->display_title;
          }
        }
        $form['displays'] = array(
          '#type' => 'checkboxes',
          '#description' => t('The feed icon will be available only to the selected displays.'),
          '#options' => $displays,
          '#default_value' => $this
            ->get_option('displays'),
        );
        break;
      case 'path':
        $form['path']['#description'] = t('This view will be displayed by visiting this path on your site. It is recommended that the path be something like "path/%/%/feed" or "path/%/%/rss.xml", putting one % in the path for each argument you have defined in the view.');
    }
  }

  /**
   * Perform any necessary changes to the form values prior to storage.
   * There is no need for this function to actually store the data.
   */
  function options_submit(&$form, &$form_state) {

    // It is very important to call the parent function here:
    parent::options_submit($form, $form_state);
    switch ($form_state['section']) {
      case 'title':
        $this
          ->set_option('sitename_title', $form_state['values']['sitename_title']);
        break;
      case 'displays':
        $this
          ->set_option($form_state['section'], $form_state['values'][$form_state['section']]);
        break;
    }
  }

  /**
   * Attach to another view.
   */
  function attach_to($display_id) {
    $displays = $this
      ->get_option('displays');
    if (empty($displays[$display_id])) {
      return;
    }

    // Defer to the feed style; it may put in meta information, and/or
    // attach a feed icon.
    $plugin = $this
      ->get_plugin();
    if ($plugin) {
      $clone = $this->view
        ->clone_view();
      $clone
        ->set_display($this->display->id);
      $clone
        ->build_title();
      $plugin
        ->attach_to($display_id, $this
        ->get_path(), $clone
        ->get_title());

      // Clean up
      $clone
        ->destroy();
      unset($clone);
    }
  }
  function uses_link_display() {
    return TRUE;
  }

}

Members

Namesort descending Modifiers Type Description Overrides
views_object::$options property Except for displays, options for the object will be held here. 1
views_object::construct function Views handlers use a special construct function so that we can more easily construct them with variable arguments. 5
views_object::options function Set default options on this object. Called by the constructor in a complex chain to deal with backward compatibility. 1
views_object::set_default_options function Set default options. For backward compatibility, it sends the options array; this is a feature that will likely disappear at some point.
views_object::set_definition function Let the handler know what its full definition is.
views_object::unpack_options function Unpack options over our existing defaults, drilling down into arrays so that defaults don't get totally blown away.
views_plugin::additional_theme_functions function Provide a list of additional theme functions for the theme information page
views_plugin::theme_functions function Provide a full list of possible theme templates used by this style.
views_plugin_display::$handlers property
views_plugin_display::accept_attachments function Can this display accept attachments?
views_plugin_display::access function Determine if the user has access to this display of the view.
views_plugin_display::add_override_button function Add an override button for a given section, allowing the user to change whether this info is stored on the default display or on the current display.
views_plugin_display::destroy function Overrides views_object::destroy
views_plugin_display::displays_exposed function Determine if this display should display the exposed filters widgets, so the view will know whether or not to render them. 1
views_plugin_display::format_themes function Format a list of theme templates for output by the theme info helper.
views_plugin_display::get_access_plugin function Get the access plugin
views_plugin_display::get_cache_plugin function Get the cache plugin
views_plugin_display::get_field_labels function Retrieve a list of fields for the current display with the relationship associated if it exists.
views_plugin_display::get_handler function Get the handler object for a single handler.
views_plugin_display::get_handlers function Get a full array of handlers for $type. This caches them.
views_plugin_display::get_link_display function Check to see which display to use when creating links within a view using this display.
views_plugin_display::get_option function Intelligently get an option either from this display or from the default display, if directed to do so.
views_plugin_display::get_path function Return the base path to use for this display.
views_plugin_display::get_plugin function Get the display or row plugin, if it exists.
views_plugin_display::get_special_blocks function Provide the block system with any exposed widget blocks for this display.
views_plugin_display::hook_block function If this display creates a block, implement one of these.
views_plugin_display::hook_menu function If this display creates a page with a menu item, implement it here.
views_plugin_display::init function Init will be called after construct, when the plugin is attached to a view and a display. Overrides views_plugin::init
views_plugin_display::is_defaulted function Determine if a given option is set to use the default display or the current display
views_plugin_display::is_default_display function Determine if this display is the 'default' display which contains fallback settings 1
views_plugin_display::is_identifier_unique function Check if the provided identifier is unique.
views_plugin_display::options_override function If override/revert was clicked, perform the proper toggle.
views_plugin_display::option_link function Because forms may be split up into sections, this provides an easy URL to exactly the right section. Don't override this.
views_plugin_display::override_option function Set an option and force it to be an override.
views_plugin_display::pre_execute function Set up any variables on the view prior to execution. These are separated from execute because they are extremely common and unlikely to be overridden on an individual display.
views_plugin_display::query function Inject anything into the query that the display handler needs. Overrides views_plugin::query
views_plugin_display::render_empty function Render the empty text of the view.
views_plugin_display::render_filters function Not all display plugins will support filtering
views_plugin_display::render_footer function Render the footer of the view.
views_plugin_display::render_header function Render the header of the view.
views_plugin_display::render_more_link function Render the 'more' link
views_plugin_display::render_pager function Does the display render the pager if it has it enabled? 1
views_plugin_display::render_textarea function Render a text area, using the proper format.
views_plugin_display::set_option function Intelligently set an option either from this display or from the default display, if directed to do so.
views_plugin_display::set_override function Flip the override setting for the given section.
views_plugin_display::uses_exposed function Determine if this display uses exposed filters, so the view will know whether or not to build them. 2
views_plugin_display::uses_fields function Determine if the display's style uses fields.
views_plugin_display::use_ajax function Does the display use AJAX?
views_plugin_display::use_more function Does the display have a more link enabled?
views_plugin_display::use_more_always function Should the enabled display more link be shown when no more items?
views_plugin_display::use_more_text function Does the display have custom link text?
views_plugin_display::use_pager function Does the display have a pager enabled? 1
views_plugin_display::view_special_blocks function Render any special blocks provided for this display.
views_plugin_display::_set_option_defaults function Set default options. Overrides views_object::_set_option_defaults
views_plugin_display_feed::attach_to function Attach to another view. Overrides views_plugin_display::attach_to
views_plugin_display_feed::defaultable_sections function Static member function to list which sections are defaultable and what items each section contains. Overrides views_plugin_display::defaultable_sections
views_plugin_display_feed::execute function Feeds do not go through the normal page theming mechanism. Instead, they go through their own little theme function and then return NULL so that Drupal believes that the page has already rendered itself...which it has. Overrides views_plugin_display_page::execute
views_plugin_display_feed::get_style_type function Displays can require a certain type of style plugin. By default, they will be 'normal'. Overrides views_plugin_display::get_style_type
views_plugin_display_feed::options_form function Provide the default form for setting options. Overrides views_plugin_display_page::options_form
views_plugin_display_feed::options_submit function Perform any necessary changes to the form values prior to storage. There is no need for this function to actually store the data. Overrides views_plugin_display_page::options_submit
views_plugin_display_feed::options_summary function Provide the summary for page options in the views UI. Overrides views_plugin_display_page::options_summary
views_plugin_display_feed::option_definition function Information about options for all kinds of purposes will be held here. Overrides views_plugin_display_page::option_definition
views_plugin_display_feed::preview function Fully render the display for the purposes of a live preview or some other AJAXy reason. Overrides views_plugin_display::preview
views_plugin_display_feed::render function Instead of going through the standard views_view.tpl.php, delegate this to the style handler. Overrides views_plugin_display::render
views_plugin_display_feed::uses_breadcrumb function Check to see if the display needs a breadcrumb Overrides views_plugin_display_page::uses_breadcrumb
views_plugin_display_feed::uses_link_display function Check to see if the display has some need to link to another display. Overrides views_plugin_display::uses_link_display
views_plugin_display_page::execute_hook_menu function Add this display's path information to Drupal's menu system.
views_plugin_display_page::has_path function The page display has a path. Overrides views_plugin_display::has_path
views_plugin_display_page::options_validate function Validate the options form. Overrides views_plugin_display::options_validate
views_plugin_display_page::validate function Make sure the display and all associated handlers are valid. Overrides views_plugin_display::validate