core-bundle/src/Resources/contao/widgets/PageSelector.php
protected function renderPagetree($id, $intMargin, $protectedPage=false, $blnNoRecursion=false, $arrFound=array())
	{
		/** @var AttributeBagInterface $objSessionBag */
		$objSessionBag = System::getContainer()->get('session')->getBag('contao_backend');

		$session = $objSessionBag->all();

		$flag = substr($this->strField, 0, 2);
		$node = 'tree_' . $this->strTable . '_' . $this->strField;
		$xtnode = 'tree_' . $this->strTable . '_' . $this->strName;

		// Get the session data and toggle the nodes
		if (Input::get($flag.'tg'))
		{
			$session[$node][Input::get($flag.'tg')] = (isset($session[$node][Input::get($flag.'tg')]) && $session[$node][Input::get($flag.'tg')] == 1) ? 0 : 1;
			$objSessionBag->replace($session);
			$this->redirect(preg_replace('/(&(amp;)?|\?)'.$flag.'tg=[^& ]*/i', '', Environment::get('request')));
		}

		$objPage = $this->Database->prepare("SELECT id, alias, type, protected, published, start, stop, hide, title FROM tl_page WHERE id=?")
								  ->limit(1)
								  ->execute($id);

		// Return if there is no result
		if ($objPage->numRows < 1)
		{
			return '';
		}

		$return = '';
		$intSpacing = 20;
		$childs = array();

		// Check whether there are child records
		if (!$blnNoRecursion)
		{
			$objNodes = $this->Database->prepare("SELECT id FROM tl_page WHERE pid=?" . (!empty($arrFound) ? " AND id IN(" . implode(',', array_map('\intval', $arrFound)) . ")" : '') . " ORDER BY sorting")
									   ->execute($id);

			if ($objNodes->numRows)
			{
				$childs = $objNodes->fetchEach('id');
			}
		}

		$return .= "\n    " . '<li class="'.(($objPage->type == 'root') ? 'tl_folder' : 'tl_file').' toggle_select hover-div"><div class="tl_left" style="padding-left:'.($intMargin + $intSpacing).'px">';

		$folderAttribute = 'style="margin-left:20px"';
		$session[$node][$id] = is_numeric($session[$node][$id]) ? $session[$node][$id] : 0;
		$level = ($intMargin / $intSpacing + 1);
		$blnIsOpen = (!empty($arrFound) || $session[$node][$id] == 1 || \in_array($id, $this->arrNodes));

		if (!empty($childs))
		{
			$folderAttribute = '';
			$img = $blnIsOpen ? 'folMinus.svg' : 'folPlus.svg';
			$alt = $blnIsOpen ? $GLOBALS['TL_LANG']['MSC']['collapseNode'] : $GLOBALS['TL_LANG']['MSC']['expandNode'];
			$return .= '<a href="'.Backend::addToUrl($flag.'tg='.$id).'" title="'.StringUtil::specialchars($alt).'" onclick="return AjaxRequest.togglePagetree(this,\''.$xtnode.'_'.$id.'\',\''.$this->strField.'\',\''.$this->strName.'\','.$level.')">'.Image::getHtml($img, '', 'style="margin-right:2px"').'</a>';
		}

		// Set the protection status
		$objPage->protected = ($objPage->protected || $protectedPage);

		// Add the current page
		if (!empty($childs))
		{
			$return .= Image::getHtml($this->getPageStatusIcon($objPage), '', $folderAttribute).' <a href="' . Backend::addToUrl('pn='.$objPage->id) . '" title="'.StringUtil::specialchars($objPage->title . ' (' . $objPage->alias . Config::get('urlSuffix') . ')').'">'.(($objPage->type == 'root') ? '<strong>' : '').$objPage->title.(($objPage->type == 'root') ? '</strong>' : '').'</a></div> <div class="tl_right">';
		}
		else
		{
			$return .= Image::getHtml($this->getPageStatusIcon($objPage), '', $folderAttribute).' '.(($objPage->type == 'root') ? '<strong>' : '').$objPage->title.(($objPage->type == 'root') ? '</strong>' : '').'</div> <div class="tl_right">';
		}

		// Add checkbox or radio button
		switch ($this->fieldType)
		{
			case 'checkbox':
				$return .= '<input type="checkbox" name="'.$this->strName.'[]" id="'.$this->strName.'_'.$id.'" class="tl_tree_checkbox" value="'.StringUtil::specialchars($id).'" onfocus="Backend.getScrollOffset()"'.static::optionChecked($id, $this->varValue).'>';
				break;

			default:
			case 'radio':
				$return .= '<input type="radio" name="'.$this->strName.'" id="'.$this->strName.'_'.$id.'" class="tl_tree_radio" value="'.StringUtil::specialchars($id).'" onfocus="Backend.getScrollOffset()"'.static::optionChecked($id, $this->varValue).'>';
				break;
		}

		$return .= '</div><div style="clear:both"></div></li>';

		// Begin a new submenu
		if ($blnIsOpen || (!empty($childs) && $objSessionBag->get('page_selector_search') != ''))
		{
			$return .= '<li class="parent" id="'.$node.'_'.$id.'"><ul class="level_'.$level.'">';

			for ($k=0, $c=\count($childs); $k<$c; $k++)
			{
				$return .= $this->renderPagetree($childs[$k], ($intMargin + $intSpacing), $objPage->protected, $blnNoRecursion, $arrFound);
			}

			$return .= '</ul></li>';
		}

		return $return;
	}
protected function renderPagetree($id, $intMargin, $protectedPage=false, $blnNoRecursion=false, $arrFound=array())
	{
		/** @var AttributeBagInterface $objSessionBag */
		$objSessionBag = System::getContainer()->get('session')->getBag('contao_backend');

		$session = $objSessionBag->all();

		$flag = substr($this->strField, 0, 2);
		$node = 'tree_' . $this->strTable . '_' . $this->strField;
		$xtnode = 'tree_' . $this->strTable . '_' . $this->strName;

		// Get the session data and toggle the nodes
		if (Input::get($flag.'tg'))
		{
			$session[$node][Input::get($flag.'tg')] = (isset($session[$node][Input::get($flag.'tg')]) && $session[$node][Input::get($flag.'tg')] == 1) ? 0 : 1;
			$objSessionBag->replace($session);
			$this->redirect(preg_replace('/(&(amp;)?|\?)'.$flag.'tg=[^& ]*/i', '', Environment::get('request')));
		}

		$objPage = $this->Database->prepare("SELECT id, alias, type, protected, published, start, stop, hide, title FROM tl_page WHERE id=?")
								  ->limit(1)
								  ->execute($id);

		// Return if there is no result
		if ($objPage->numRows < 1)
		{
			return '';
		}

		$return = '';
		$intSpacing = 20;
		$childs = array();

		// Check whether there are child records
		if (!$blnNoRecursion)
		{
			$objNodes = $this->Database->prepare("SELECT id FROM tl_page WHERE pid=?" . (!empty($arrFound) ? " AND id IN(" . implode(',', array_map('\intval', $arrFound)) . ")" : '') . " ORDER BY sorting")
									   ->execute($id);

			if ($objNodes->numRows)
			{
				$childs = $objNodes->fetchEach('id');
			}
		}

		$return .= "\n    " . '<li class="'.(($objPage->type == 'root') ? 'tl_folder' : 'tl_file').' toggle_select hover-div"><div class="tl_left" style="padding-left:'.($intMargin + $intSpacing).'px">';

		$folderAttribute = 'style="margin-left:20px"';
		$session[$node][$id] = is_numeric($session[$node][$id]) ? $session[$node][$id] : 0;
		$level = ($intMargin / $intSpacing + 1);
		$blnIsOpen = (!empty($arrFound) || $session[$node][$id] == 1 || \in_array($id, $this->arrNodes));

		if (!empty($childs))
		{
			$folderAttribute = '';
			$img = $blnIsOpen ? 'folMinus.svg' : 'folPlus.svg';
			$alt = $blnIsOpen ? $GLOBALS['TL_LANG']['MSC']['collapseNode'] : $GLOBALS['TL_LANG']['MSC']['expandNode'];
			$return .= '<a href="'.Backend::addToUrl($flag.'tg='.$id).'" title="'.StringUtil::specialchars($alt).'" onclick="return AjaxRequest.togglePagetree(this,\''.$xtnode.'_'.$id.'\',\''.$this->strField.'\',\''.$this->strName.'\','.$level.')">'.Image::getHtml($img, '', 'style="margin-right:2px"').'</a>';
		}

		// Set the protection status
		$objPage->protected = ($objPage->protected || $protectedPage);

		// Add the current page
		if (!empty($childs))
		{
			$return .= Image::getHtml($this->getPageStatusIcon($objPage), '', $folderAttribute).' <a href="' . Backend::addToUrl('pn='.$objPage->id) . '" title="'.StringUtil::specialchars($objPage->title . ' (' . $objPage->alias . Config::get('urlSuffix') . ')').'">'.(($objPage->type == 'root') ? '<strong>' : '').$objPage->title.(($objPage->type == 'root') ? '</strong>' : '').'</a></div> <div class="tl_right">';
		}
		else
		{
			$return .= Image::getHtml($this->getPageStatusIcon($objPage), '', $folderAttribute).' '.(($objPage->type == 'root') ? '<strong>' : '').$objPage->title.(($objPage->type == 'root') ? '</strong>' : '').'</div> <div class="tl_right">';
		}

		// Add checkbox or radio button
		switch ($this->fieldType)
		{
			case 'checkbox':
				$return .= '<input type="checkbox" name="'.$this->strName.'[]" id="'.$this->strName.'_'.$id.'" class="tl_tree_checkbox" value="'.StringUtil::specialchars($id).'" onfocus="Backend.getScrollOffset()"'.static::optionChecked($id, $this->varValue).'>';
				break;

			default:
			case 'radio':
				$return .= '<input type="radio" name="'.$this->strName.'" id="'.$this->strName.'_'.$id.'" class="tl_tree_radio" value="'.StringUtil::specialchars($id).'" onfocus="Backend.getScrollOffset()"'.static::optionChecked($id, $this->varValue).'>';
				break;
		}

		$return .= '</div><div style="clear:both"></div></li>';

		// Begin a new submenu
		if ($blnIsOpen || (!empty($childs) && $objSessionBag->get('page_selector_search') != ''))
		{
			$return .= '<li class="parent" id="'.$node.'_'.$id.'"><ul class="level_'.$level.'">';

			for ($k=0, $c=\count($childs); $k<$c; $k++)
			{
				$return .= $this->renderPagetree($childs[$k], ($intMargin + $intSpacing), $objPage->protected, $blnNoRecursion, $arrFound);
			}

			$return .= '</ul></li>';
		}

		return $return;
	}
Recursively render the pagetree

@param integer $id
@param integer $intMargin
@param boolean $protectedPage
@param boolean $blnNoRecursion
@param array   $arrFound

@return string