core-bundle/src/Resources/contao/widgets/FileSelector.php
protected function renderFiletree($path, $intMargin, $mount=false, $blnProtected=true, $arrFound=array())
	{
		// Invalid path
		if (!is_dir($path))
		{
			return '';
		}

		// Make sure that $this->varValue is an array (see #3369)
		if (!\is_array($this->varValue))
		{
			$this->varValue = array($this->varValue);
		}

		/** @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 session data and toggle 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')));
		}

		$return = '';
		$intSpacing = 20;
		$files = array();
		$folders = array();
		$level = ($intMargin / $intSpacing + 1);

		// Mount folder
		if ($mount)
		{
			$folders = array($path);
		}

		// Scan directory and sort the result
		else
		{
			foreach (scan($path) as $v)
			{
				if (strncmp($v, '.', 1) === 0)
				{
					continue;
				}

				if (is_dir($path . '/' . $v))
				{
					$folders[] = $path . '/' . $v;
				}
				else
				{
					$files[] = $path . '/' . $v;
				}
			}
		}

		natcasesort($folders);
		$folders = array_values($folders);

		natcasesort($files);
		$files = array_values($files);

		// Sort descending (see #4072)
		if ($this->sort == 'desc')
		{
			$folders = array_reverse($folders);
			$files = array_reverse($files);
		}

		$folderClass = ($this->files || $this->filesOnly) ? 'tl_folder' : 'tl_file';

		// Process folders
		for ($f=0, $c=\count($folders); $f<$c; $f++)
		{
			$content = scan($folders[$f]);
			$currentFolder = StringUtil::stripRootDir($folders[$f]);
			$countFiles = \count($content);

			// Check whether there are subfolders or files
			foreach ($content as $file)
			{
				if (strncmp($file, '.', 1) === 0)
				{
					--$countFiles;
				}
				elseif (!$this->files && !$this->filesOnly && is_file($folders[$f] . '/' . $file))
				{
					--$countFiles;
				}
				elseif (!empty($arrFound) && !\in_array($currentFolder . '/' . $file, $arrFound) && !preg_grep('/^' . preg_quote($currentFolder . '/' . $file, '/') . '\//', $arrFound))
				{
					--$countFiles;
				}
			}

			if (!empty($arrFound) && $countFiles < 1 && !\in_array($currentFolder, $arrFound))
			{
				continue;
			}

			$tid = md5($folders[$f]);
			$folderAttribute = 'style="margin-left:20px"';
			$session[$node][$tid] = is_numeric($session[$node][$tid]) ? $session[$node][$tid] : 0;
			$currentFolder = StringUtil::stripRootDir($folders[$f]);
			$blnIsOpen = (!empty($arrFound) || $session[$node][$tid] == 1 || \count(preg_grep('/^' . preg_quote($currentFolder, '/') . '\//', $this->varValue)) > 0);
			$return .= "\n    " . '<li class="'.$folderClass.' toggle_select hover-div"><div class="tl_left" style="padding-left:'.$intMargin.'px">';

			// Add a toggle button if there are childs
			if ($countFiles > 0)
			{
				$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='.$tid).'" title="'.StringUtil::specialchars($alt).'" onclick="return AjaxRequest.toggleFiletree(this,\''.$xtnode.'_'.$tid.'\',\''.$currentFolder.'\',\''.$this->strField.'\',\''.$this->strName.'\','.$level.')">'.Image::getHtml($img, '', 'style="margin-right:2px"').'</a>';
			}

			$protected = $blnProtected;

			// Check whether the folder is public
			if ($protected === true && \in_array('.public', $content))
			{
				$protected = false;
			}

			$folderImg = $protected ? 'folderCP.svg' : 'folderC.svg';
			$folderLabel = ($this->files || $this->filesOnly) ? '<strong>'.StringUtil::specialchars(basename($currentFolder)).'</strong>' : StringUtil::specialchars(basename($currentFolder));

			// Add the current folder
			$return .= Image::getHtml($folderImg, '', $folderAttribute).' <a href="' . Backend::addToUrl('fn='.$this->urlEncode($currentFolder)) . '" title="'.StringUtil::specialchars($GLOBALS['TL_LANG']['MSC']['selectNode']).'">'.$folderLabel.'</a></div> <div class="tl_right">';

			// Add a checkbox or radio button
			if (!$this->filesOnly)
			{
				switch ($this->fieldType)
				{
					case 'checkbox':
						$return .= '<input type="checkbox" name="'.$this->strName.'[]" id="'.$this->strName.'_'.md5($currentFolder).'" class="tl_tree_checkbox" value="'.StringUtil::specialchars($currentFolder).'" onfocus="Backend.getScrollOffset()"'.$this->optionChecked($currentFolder, $this->varValue).'>';
						break;

					default:
					case 'radio':
						$return .= '<input type="radio" name="'.$this->strName.'" id="'.$this->strName.'_'.md5($currentFolder).'" class="tl_tree_radio" value="'.StringUtil::specialchars($currentFolder).'" onfocus="Backend.getScrollOffset()"'.$this->optionChecked($currentFolder, $this->varValue).'>';
						break;
				}
			}

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

			// Call the next node
			if ($blnIsOpen)
			{
				$return .= '<li class="parent" id="'.$xtnode.'_'.$tid.'"><ul class="level_'.$level.'">';
				$return .= $this->renderFiletree($folders[$f], ($intMargin + $intSpacing), false, $protected, $arrFound);
				$return .= '</ul></li>';
			}
		}

		// Process files
		if ($this->files || $this->filesOnly)
		{
			for ($h=0, $c=\count($files); $h<$c; $h++)
			{
				$thumbnail = '';
				$currentFile = StringUtil::stripRootDir($files[$h]);
				$currentEncoded = $this->urlEncode($currentFile);

				$objFile = new File($currentFile);

				if (!empty($this->arrValidFileTypes) && !\in_array($objFile->extension, $this->arrValidFileTypes))
				{
					continue;
				}

				// Ignore files not matching the search criteria
				if (!empty($arrFound) && !\in_array($currentFile, $arrFound))
				{
					continue;
				}

				$return .= "\n    " . '<li class="tl_file toggle_select hover-div"><div class="tl_left" style="padding-left:'.($intMargin + $intSpacing).'px">';
				$thumbnail .= ' <span class="tl_gray">('.$this->getReadableSize($objFile->filesize);

				if ($objFile->width && $objFile->height)
				{
					$thumbnail .= ', '.$objFile->width.'x'.$objFile->height.' px';
				}

				$thumbnail .= ')</span>';

				// Generate thumbnail
				if ($objFile->isImage && $objFile->viewHeight > 0 && Config::get('thumbnails') && ($objFile->isSvgImage || ($objFile->height <= Config::get('gdMaxImgHeight') && $objFile->width <= Config::get('gdMaxImgWidth'))))
				{
					$rootDir = System::getContainer()->getParameter('kernel.project_dir');
					$thumbnail .= '<br>' . Image::getHtml(System::getContainer()->get('contao.image.image_factory')->create($rootDir . '/' . rawurldecode($currentEncoded), array(100, 75, ResizeConfiguration::MODE_BOX))->getUrl($rootDir), '', 'style="margin:0 0 2px -18px"');
					$importantPart = System::getContainer()->get('contao.image.image_factory')->create($rootDir . '/' . rawurldecode($currentEncoded))->getImportantPart();

					if ($importantPart->getPosition()->getX() > 0 || $importantPart->getPosition()->getY() > 0 || $importantPart->getSize()->getWidth() < $objFile->width || $importantPart->getSize()->getHeight() < $objFile->height)
					{
						$thumbnail .= ' ' . Image::getHtml(System::getContainer()->get('contao.image.image_factory')->create($rootDir . '/' . rawurldecode($currentEncoded), (new ResizeConfiguration())->setWidth(80)->setHeight(60)->setMode(ResizeConfiguration::MODE_BOX)->setZoomLevel(100))->getUrl($rootDir), '', 'style="margin:0 0 2px 0;vertical-align:bottom"');
					}
				}

				$return .= Image::getHtml($objFile->icon, $objFile->mime).' '.StringUtil::convertEncoding(StringUtil::specialchars(basename($currentFile)), Config::get('characterSet')).$thumbnail.'</div> <div class="tl_right">';

				// Add checkbox or radio button
				switch ($this->fieldType)
				{
					case 'checkbox':
						$return .= '<input type="checkbox" name="'.$this->strName.'[]" id="'.$this->strName.'_'.md5($currentFile).'" class="tl_tree_checkbox" value="'.StringUtil::specialchars($currentFile).'" onfocus="Backend.getScrollOffset()"'.$this->optionChecked($currentFile, $this->varValue).'>';
						break;

					default:
					case 'radio':
						$return .= '<input type="radio" name="'.$this->strName.'" id="'.$this->strName.'_'.md5($currentFile).'" class="tl_tree_radio" value="'.StringUtil::specialchars($currentFile).'" onfocus="Backend.getScrollOffset()"'.$this->optionChecked($currentFile, $this->varValue).'>';
						break;
				}

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

		return $return;
	}
protected function renderFiletree($path, $intMargin, $mount=false, $blnProtected=true, $arrFound=array())
	{
		// Invalid path
		if (!is_dir($path))
		{
			return '';
		}

		// Make sure that $this->varValue is an array (see #3369)
		if (!\is_array($this->varValue))
		{
			$this->varValue = array($this->varValue);
		}

		/** @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 session data and toggle 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')));
		}

		$return = '';
		$intSpacing = 20;
		$files = array();
		$folders = array();
		$level = ($intMargin / $intSpacing + 1);

		// Mount folder
		if ($mount)
		{
			$folders = array($path);
		}

		// Scan directory and sort the result
		else
		{
			foreach (scan($path) as $v)
			{
				if (strncmp($v, '.', 1) === 0)
				{
					continue;
				}

				if (is_dir($path . '/' . $v))
				{
					$folders[] = $path . '/' . $v;
				}
				else
				{
					$files[] = $path . '/' . $v;
				}
			}
		}

		natcasesort($folders);
		$folders = array_values($folders);

		natcasesort($files);
		$files = array_values($files);

		// Sort descending (see #4072)
		if ($this->sort == 'desc')
		{
			$folders = array_reverse($folders);
			$files = array_reverse($files);
		}

		$folderClass = ($this->files || $this->filesOnly) ? 'tl_folder' : 'tl_file';

		// Process folders
		for ($f=0, $c=\count($folders); $f<$c; $f++)
		{
			$content = scan($folders[$f]);
			$currentFolder = StringUtil::stripRootDir($folders[$f]);
			$countFiles = \count($content);

			// Check whether there are subfolders or files
			foreach ($content as $file)
			{
				if (strncmp($file, '.', 1) === 0)
				{
					--$countFiles;
				}
				elseif (!$this->files && !$this->filesOnly && is_file($folders[$f] . '/' . $file))
				{
					--$countFiles;
				}
				elseif (!empty($arrFound) && !\in_array($currentFolder . '/' . $file, $arrFound) && !preg_grep('/^' . preg_quote($currentFolder . '/' . $file, '/') . '\//', $arrFound))
				{
					--$countFiles;
				}
			}

			if (!empty($arrFound) && $countFiles < 1 && !\in_array($currentFolder, $arrFound))
			{
				continue;
			}

			$tid = md5($folders[$f]);
			$folderAttribute = 'style="margin-left:20px"';
			$session[$node][$tid] = is_numeric($session[$node][$tid]) ? $session[$node][$tid] : 0;
			$currentFolder = StringUtil::stripRootDir($folders[$f]);
			$blnIsOpen = (!empty($arrFound) || $session[$node][$tid] == 1 || \count(preg_grep('/^' . preg_quote($currentFolder, '/') . '\//', $this->varValue)) > 0);
			$return .= "\n    " . '<li class="'.$folderClass.' toggle_select hover-div"><div class="tl_left" style="padding-left:'.$intMargin.'px">';

			// Add a toggle button if there are childs
			if ($countFiles > 0)
			{
				$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='.$tid).'" title="'.StringUtil::specialchars($alt).'" onclick="return AjaxRequest.toggleFiletree(this,\''.$xtnode.'_'.$tid.'\',\''.$currentFolder.'\',\''.$this->strField.'\',\''.$this->strName.'\','.$level.')">'.Image::getHtml($img, '', 'style="margin-right:2px"').'</a>';
			}

			$protected = $blnProtected;

			// Check whether the folder is public
			if ($protected === true && \in_array('.public', $content))
			{
				$protected = false;
			}

			$folderImg = $protected ? 'folderCP.svg' : 'folderC.svg';
			$folderLabel = ($this->files || $this->filesOnly) ? '<strong>'.StringUtil::specialchars(basename($currentFolder)).'</strong>' : StringUtil::specialchars(basename($currentFolder));

			// Add the current folder
			$return .= Image::getHtml($folderImg, '', $folderAttribute).' <a href="' . Backend::addToUrl('fn='.$this->urlEncode($currentFolder)) . '" title="'.StringUtil::specialchars($GLOBALS['TL_LANG']['MSC']['selectNode']).'">'.$folderLabel.'</a></div> <div class="tl_right">';

			// Add a checkbox or radio button
			if (!$this->filesOnly)
			{
				switch ($this->fieldType)
				{
					case 'checkbox':
						$return .= '<input type="checkbox" name="'.$this->strName.'[]" id="'.$this->strName.'_'.md5($currentFolder).'" class="tl_tree_checkbox" value="'.StringUtil::specialchars($currentFolder).'" onfocus="Backend.getScrollOffset()"'.$this->optionChecked($currentFolder, $this->varValue).'>';
						break;

					default:
					case 'radio':
						$return .= '<input type="radio" name="'.$this->strName.'" id="'.$this->strName.'_'.md5($currentFolder).'" class="tl_tree_radio" value="'.StringUtil::specialchars($currentFolder).'" onfocus="Backend.getScrollOffset()"'.$this->optionChecked($currentFolder, $this->varValue).'>';
						break;
				}
			}

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

			// Call the next node
			if ($blnIsOpen)
			{
				$return .= '<li class="parent" id="'.$xtnode.'_'.$tid.'"><ul class="level_'.$level.'">';
				$return .= $this->renderFiletree($folders[$f], ($intMargin + $intSpacing), false, $protected, $arrFound);
				$return .= '</ul></li>';
			}
		}

		// Process files
		if ($this->files || $this->filesOnly)
		{
			for ($h=0, $c=\count($files); $h<$c; $h++)
			{
				$thumbnail = '';
				$currentFile = StringUtil::stripRootDir($files[$h]);
				$currentEncoded = $this->urlEncode($currentFile);

				$objFile = new File($currentFile);

				if (!empty($this->arrValidFileTypes) && !\in_array($objFile->extension, $this->arrValidFileTypes))
				{
					continue;
				}

				// Ignore files not matching the search criteria
				if (!empty($arrFound) && !\in_array($currentFile, $arrFound))
				{
					continue;
				}

				$return .= "\n    " . '<li class="tl_file toggle_select hover-div"><div class="tl_left" style="padding-left:'.($intMargin + $intSpacing).'px">';
				$thumbnail .= ' <span class="tl_gray">('.$this->getReadableSize($objFile->filesize);

				if ($objFile->width && $objFile->height)
				{
					$thumbnail .= ', '.$objFile->width.'x'.$objFile->height.' px';
				}

				$thumbnail .= ')</span>';

				// Generate thumbnail
				if ($objFile->isImage && $objFile->viewHeight > 0 && Config::get('thumbnails') && ($objFile->isSvgImage || ($objFile->height <= Config::get('gdMaxImgHeight') && $objFile->width <= Config::get('gdMaxImgWidth'))))
				{
					$rootDir = System::getContainer()->getParameter('kernel.project_dir');
					$thumbnail .= '<br>' . Image::getHtml(System::getContainer()->get('contao.image.image_factory')->create($rootDir . '/' . rawurldecode($currentEncoded), array(100, 75, ResizeConfiguration::MODE_BOX))->getUrl($rootDir), '', 'style="margin:0 0 2px -18px"');
					$importantPart = System::getContainer()->get('contao.image.image_factory')->create($rootDir . '/' . rawurldecode($currentEncoded))->getImportantPart();

					if ($importantPart->getPosition()->getX() > 0 || $importantPart->getPosition()->getY() > 0 || $importantPart->getSize()->getWidth() < $objFile->width || $importantPart->getSize()->getHeight() < $objFile->height)
					{
						$thumbnail .= ' ' . Image::getHtml(System::getContainer()->get('contao.image.image_factory')->create($rootDir . '/' . rawurldecode($currentEncoded), (new ResizeConfiguration())->setWidth(80)->setHeight(60)->setMode(ResizeConfiguration::MODE_BOX)->setZoomLevel(100))->getUrl($rootDir), '', 'style="margin:0 0 2px 0;vertical-align:bottom"');
					}
				}

				$return .= Image::getHtml($objFile->icon, $objFile->mime).' '.StringUtil::convertEncoding(StringUtil::specialchars(basename($currentFile)), Config::get('characterSet')).$thumbnail.'</div> <div class="tl_right">';

				// Add checkbox or radio button
				switch ($this->fieldType)
				{
					case 'checkbox':
						$return .= '<input type="checkbox" name="'.$this->strName.'[]" id="'.$this->strName.'_'.md5($currentFile).'" class="tl_tree_checkbox" value="'.StringUtil::specialchars($currentFile).'" onfocus="Backend.getScrollOffset()"'.$this->optionChecked($currentFile, $this->varValue).'>';
						break;

					default:
					case 'radio':
						$return .= '<input type="radio" name="'.$this->strName.'" id="'.$this->strName.'_'.md5($currentFile).'" class="tl_tree_radio" value="'.StringUtil::specialchars($currentFile).'" onfocus="Backend.getScrollOffset()"'.$this->optionChecked($currentFile, $this->varValue).'>';
						break;
				}

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

		return $return;
	}
Recursively render the filetree

@param string  $path
@param integer $intMargin
@param boolean $mount
@param boolean $blnProtected
@param array   $arrFound

@return string