class views_plugin_display_attachment

class views_plugin_display_attachment extends views_plugin_display {
    function option_definition() {
        $options = parent::option_definition();
        $options['attachment_position'] = array(
            'default' => 'before',
        );
        $options['inherit_arguments'] = array(
            'default' => TRUE,
        );
        $options['inherit_exposed_filters'] = array(
            'default' => FALSE,
        );
        $options['inherit_pager'] = array(
            'default' => FALSE,
        );
        $options['render_pager'] = array(
            'default' => FALSE,
        );
        $options['displays'] = array(
            'default' => array(),
        );
        return $options;
    }
    function execute() {
        return $this->view
            ->render($this->display->id);
    }
    function attachment_positions($position = NULL) {
        $positions = array(
            'before' => t('Before'),
            'after' => t('After'),
            'both' => t('Both'),
        );
        if ($position) {
            return $positions[$position];
        }
        return $positions;
    }
    
    /**
     * Provide the summary for attachment options in the views UI.
     *
     * This output is returned as an array.
     */
    function options_summary(&$categories, &$options) {
        // It is very important to call the parent function here:
        parent::options_summary($categories, $options);
        $categories['attachment'] = array(
            'title' => t('Attachment settings'),
        );
        $options['inherit_arguments'] = array(
            'category' => 'attachment',
            'title' => t('Inherit arguments'),
            'value' => $this->get_option('inherit_arguments') ? t('Yes') : t('No'),
        );
        $options['inherit_exposed_filters'] = array(
            'category' => 'attachment',
            'title' => t('Inherit exposed filters'),
            'value' => $this->get_option('inherit_exposed_filters') ? t('Yes') : t('No'),
        );
        $options['inherit_pager'] = array(
            'category' => 'attachment',
            'title' => t('Inherit pager'),
            'value' => $this->get_option('inherit_pager') ? t('Yes') : t('No'),
        );
        $options['render_pager'] = array(
            'category' => 'attachment',
            'title' => t('Render pager'),
            'value' => $this->get_option('render_pager') ? t('Yes') : t('No'),
        );
        $options['attachment_position'] = array(
            'category' => 'attachment',
            'title' => t('Position'),
            'value' => $this->attachment_positions($this->get_option('attachment_position')),
        );
        $displays = array_filter($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' => 'attachment',
            '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 'inherit_arguments':
                $form['#title'] .= t('Inherit arguments');
                $form['inherit_arguments'] = array(
                    '#type' => 'checkbox',
                    '#title' => t('Inherit'),
                    '#description' => t('Should this display inherit its arguments from the parent display to which it is attached?'),
                    '#default_value' => $this->get_option('inherit_arguments'),
                );
                break;
            case 'inherit_exposed_filters':
                $form['#title'] .= t('Inherit exposed filters');
                $form['inherit_exposed_filters'] = array(
                    '#type' => 'checkbox',
                    '#title' => t('Inherit'),
                    '#description' => t('Should this display inherit its exposed filter values from the parent display to which it is attached?'),
                    '#default_value' => $this->get_option('inherit_exposed_filters'),
                );
                break;
            case 'inherit_pager':
                $form['#title'] .= t('Inherit pager');
                $form['inherit_pager'] = array(
                    '#type' => 'checkbox',
                    '#title' => t('Inherit'),
                    '#description' => t('Should this display inherit its paging values from the parent display to which it is attached?'),
                    '#default_value' => $this->get_option('inherit_pager'),
                );
                break;
            case 'render_pager':
                $form['#title'] .= t('Render pager');
                $form['render_pager'] = array(
                    '#type' => 'checkbox',
                    '#title' => t('Render'),
                    '#description' => t('Should this display render the pager values? This is only meaningful if inheriting a pager.'),
                    '#default_value' => $this->get_option('render_pager'),
                );
                break;
            case 'attachment_position':
                $form['#title'] .= t('Position');
                $form['attachment_position'] = array(
                    '#type' => 'radios',
                    '#description' => t('Attach before or after the parent display?'),
                    '#options' => $this->attachment_positions(),
                    '#default_value' => $this->get_option('attachment_position'),
                );
                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('Select which display or displays this should attach to.'),
                    '#options' => $displays,
                    '#default_value' => $this->get_option('displays'),
                );
                break;
        }
    }
    
    /**
     * 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 'inherit_arguments':
            case 'inherit_pager':
            case 'render_pager':
            case 'inherit_exposed_filters':
            case 'attachment_position':
            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[$display_id])) {
            return;
        }
        if (!$this->access()) {
            return;
        }
        // Get a fresh view because our current one has a lot of stuff on it because it's
        // already been executed.
        $view = $this->view
            ->clone_view();
        $view->original_args = $view->args;
        $args = $this->get_option('inherit_arguments') ? $this->view->args : array();
        $view->set_arguments($args);
        $view->set_display($this->display->id);
        if ($this->get_option('inherit_pager')) {
            $view->display_handler->use_pager = $this->view->display[$display_id]->handler
                ->use_pager();
            $view->display_handler
                ->set_option('pager', $this->view->display[$display_id]->handler
                ->get_option('pager'));
        }
        $attachment = $view->execute_display($this->display->id, $args);
        switch ($this->get_option('attachment_position')) {
            case 'before':
                $this->view->attachment_before .= $attachment;
                break;
            case 'after':
                $this->view->attachment_after .= $attachment;
                break;
            case 'both':
                $this->view->attachment_before .= $attachment;
                $this->view->attachment_after .= $attachment;
                break;
        }
        $view->destroy();
    }
    
    /**
     * Attachment displays only use exposed widgets if
     * they are set to inherit the exposed filter settings
     * of their parent display.
     */
    function uses_exposed() {
        if (!empty($this->options['inherit_exposed_filters']) && parent::uses_exposed()) {
            return TRUE;
        }
        return FALSE;
    }
    
    /**
     * If an attachment is set to inherit the exposed filter
     * settings from its parent display, then don't render and
     * display a second set of exposed filter widgets.
     */
    function displays_exposed() {
        return $this->options['inherit_exposed_filters'] ? FALSE : TRUE;
    }
    function use_pager() {
        return !empty($this->use_pager);
    }
    function render_pager() {
        return !empty($this->use_pager) && $this->get_option('render_pager');
    }

}