Method getInput

/**
 * Method to get the field input for module layouts.
 *
 * @return  string  The field input.
 *
 * @since   1.6
 */
protected function getInput()
{
    // Get the client id.
    $clientId = $this->element['client_id'];
    if ($clientId === null && $this->form instanceof Form) {
        $clientId = $this->form->getValue('client_id');
    }
    $clientId = (int) $clientId;
    $client = ApplicationHelper::getClientInfo($clientId);
    // Get the module.
    $module = (string) $this->element['module'];
    if (empty($module) && $this->form instanceof Form) {
        $module = $this->form->getValue('module');
    }
    $module = preg_replace('#\\W#', '', $module);
    // Get the template.
    $template = (string) $this->element['template'];
    $template = preg_replace('#\\W#', '', $template);
    // Get the style.
    $template_style_id = 0;
    if ($this->form instanceof Form) {
        $template_style_id = $this->form->getValue('template_style_id', null, 0);
        $template_style_id = (int) preg_replace('#\\W#', '', $template_style_id);
    }
    // If an extension and view are present build the options.
    if ($module && $client) {
        // Load language file
        $lang = Factory::getLanguage();
        $lang->load($module . '.sys', $client->path) || $lang->load($module . '.sys', $client->path . '/modules/' . $module);
        // Get the database object and a new query object.
        $db = Factory::getDbo();
        $query = $db->getQuery(true);
        // Build the query.
        $query->select([$db->quoteName('element'), $db->quoteName('name')])->from($db->quoteName('#__extensions', 'e'))->where([$db->quoteName('e.client_id') . ' = :clientId', $db->quoteName('e.type') . ' = ' . $db->quote('template'), $db->quoteName('e.enabled') . ' = 1'])->bind(':clientId', $clientId, ParameterType::INTEGER);
        if ($template) {
            $query->where($db->quoteName('e.element') . ' = :template')->bind(':template', $template);
        }
        if ($template_style_id) {
            $query->join('LEFT', $db->quoteName('#__template_styles', 's'), $db->quoteName('s.template') . ' = ' . $db->quoteName('e.element'))->where($db->quoteName('s.id') . ' = :style')->bind(':style', $template_style_id, ParameterType::INTEGER);
        }
        // Set the query and load the templates.
        $db->setQuery($query);
        $templates = $db->loadObjectList('element');
        // Build the search paths for module layouts.
        $module_path = Path::clean($client->path . '/modules/' . $module . '/tmpl');
        // Prepare array of component layouts
        $module_layouts = array();
        // Prepare the grouped list
        $groups = array();
        // Add the layout options from the module path.
        if (is_dir($module_path) && ($module_layouts = Folder::files($module_path, '^[^_]*\\.php$'))) {
            // Create the group for the module
            $groups['_'] = array();
            $groups['_']['id'] = $this->id . '__';
            $groups['_']['text'] = Text::sprintf('JOPTION_FROM_MODULE');
            $groups['_']['items'] = array();
            foreach ($module_layouts as $file) {
                // Add an option to the module group
                $value = basename($file, '.php');
                $text = $lang->hasKey($key = strtoupper($module . '_LAYOUT_' . $value)) ? Text::_($key) : $value;
                $groups['_']['items'][] = HTMLHelper::_('select.option', '_:' . $value, $text);
            }
        }
        // Loop on all templates
        if ($templates) {
            foreach ($templates as $template) {
                // Load language file
                $lang->load('tpl_' . $template->element . '.sys', $client->path) || $lang->load('tpl_' . $template->element . '.sys', $client->path . '/templates/' . $template->element);
                $template_path = Path::clean($client->path . '/templates/' . $template->element . '/html/' . $module);
                // Add the layout options from the template path.
                if (is_dir($template_path) && ($files = Folder::files($template_path, '^[^_]*\\.php$'))) {
                    foreach ($files as $i => $file) {
                        // Remove layout that already exist in component ones
                        if (\in_array($file, $module_layouts)) {
                            unset($files[$i]);
                        }
                    }
                    if (\count($files)) {
                        // Create the group for the template
                        $groups[$template->element] = array();
                        $groups[$template->element]['id'] = $this->id . '_' . $template->element;
                        $groups[$template->element]['text'] = Text::sprintf('JOPTION_FROM_TEMPLATE', $template->name);
                        $groups[$template->element]['items'] = array();
                        foreach ($files as $file) {
                            // Add an option to the template group
                            $value = basename($file, '.php');
                            $text = $lang->hasKey($key = strtoupper('TPL_' . $template->element . '_' . $module . '_LAYOUT_' . $value)) ? Text::_($key) : $value;
                            $groups[$template->element]['items'][] = HTMLHelper::_('select.option', $template->element . ':' . $value, $text);
                        }
                    }
                }
            }
        }
        // Compute attributes for the grouped list
        $attr = $this->element['size'] ? ' size="' . (int) $this->element['size'] . '"' : '';
        $attr .= $this->element['class'] ? ' class="' . (string) $this->element['class'] . '"' : '';
        // Prepare HTML code
        $html = array();
        // Compute the current selected values
        $selected = array($this->value);
        // Add a grouped list
        $html[] = HTMLHelper::_('select.groupedlist', $groups, $this->name, array('id' => $this->id, 'group.id' => 'id', 'list.attr' => $attr, 'list.select' => $selected));
        return implode($html);
    } else {
        return '';
    }
}