and Qiang Xue * @link http://www.pradosoft.com/ * @copyright Copyright © 2005-2014 PradoSoft * @license http://www.pradosoft.com/license/ * @package System.Web.UI */ /** * THead class * * THead displays a head element on a page. It displays the content * enclosed in its body and the page title set by the * {@link setTitle Title} property. In addition, stylesheets and JavaScripts registered via * {@link TClientScriptManager::registerStyleSheet}, {@link TClientScriptManager::registerStyleSheetFile} * {@link TClientScriptManager::registerHeadJavaScript}, and * {@link TClientScriptManager::registerHeadJavaScriptFile} will also be displayed * in the head. * THead also manages and displays meta tags through its {@link getMetaTags MetaTags} * property. You can add a meta object to the collection in code dynamically, * or add it in template using the following syntax, * * * * * * * * Note, {@link TPage} has a property {@link TPage::getHead Head} that refers to * the THead control currently on the page. A page can have at most one THead * control. Although not required, it is recommended to place a THead on your page. * Without a THead on the page, stylesheets and javascripts in the current page * theme will not be rendered. * * @author Marcus Nyeholt and Qiang Xue * @package System.Web.UI * @since 3.0 */ class THead extends TControl { /** * @var TList list of meta name tags to be loaded by {@link THead} */ private $_metaTags=null; /** * Registers the head control with the current page. * This method is invoked when the control enters 'Init' stage. * The method raises 'Init' event. * If you override this method, be sure to call the parent implementation * so that the event handlers can be invoked. * @param TEventParameter event parameter to be passed to the event handlers */ public function onInit($param) { parent::onInit($param); $this->getPage()->setHead($this); } /** * Processes an object that is created during parsing template. * This method adds TMetaTag components into the {@link getMetaTags MetaTags} * collection of the head control. * @param string|TComponent text string or component parsed and instantiated in template * @see createdOnTemplate */ public function addParsedObject($object) { if($object instanceof TMetaTag) $this->getMetaTags()->add($object); else parent::addParsedObject($object); } /** * @return string the page title. */ public function getTitle() { return $this->getViewState('Title',''); } /** * Sets the page title. * This title will be rendered only if the {@link TPage::getTitle Title} property * of the page is empty. * @param string the page title. */ public function setTitle($value) { $this->setViewState('Title',$value,''); } /** * @return string base URL of the page. This URL is rendered as the 'href' attribute of tag. Defaults to ''. */ public function getBaseUrl() { return $this->getViewState('BaseUrl',''); } /** * @param string base URL of the page. This URL is rendered as the 'href' attribute of tag. */ public function setBaseUrl($url) { $this->setViewState('BaseUrl',$url,''); } /** * @return string the URL for the shortcut icon of the page. Defaults to ''. */ public function getShortcutIcon() { return $this->getViewState('ShortcutIcon',''); } /** * @param string the URL for the shortcut icon of the page. */ public function setShortcutIcon($url) { $this->setViewState('ShortcutIcon',$url,''); } /** * @return TMetaTagCollection meta tag collection */ public function getMetaTags() { if(($metaTags=$this->getViewState('MetaTags',null))===null) { $metaTags=new TMetaTagCollection; $this->setViewState('MetaTags',$metaTags,null); } return $metaTags; } /** * Renders the head control. * @param THtmlWriter the writer for rendering purpose. */ public function render($writer) { $page=$this->getPage(); $title=$this->getTitle(); $writer->write("\n".THttpUtility::htmlEncode($title)."\n"); if(($baseUrl=$this->getBaseUrl())!=='') $writer->write('\n"); if(($icon=$this->getShortcutIcon())!=='') $writer->write('\n"); if(($metaTags=$this->getMetaTags())!==null) { foreach($metaTags as $metaTag) { $metaTag->render($writer); $writer->writeLine(); } } $cs=$page->getClientScript(); $cs->renderStyleSheetFiles($writer); $cs->renderStyleSheets($writer); if($page->getClientSupportsJavaScript()) { $cs->renderHeadScriptFiles($writer); $cs->renderHeadScripts($writer); } parent::render($writer); $writer->write("\n"); } }