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<?php
/**
* THead class file
*
* @author Marcus Nyeholt <tanus@users.sourceforge.net> and Qiang Xue <qiang.xue@gmail.com>
* @link http://www.pradosoft.com/
* @copyright Copyright © 2005 PradoSoft
* @license http://www.pradosoft.com/license/
* @version $Revision: $ $Date: $
* @package System.Web.UI.WebControls
*/
/**
* THead class
*
* THead displays a <head> element on a page. It displays the content
* enclosed in its body. In addition, it displays the page title set by the
* {@link setTitle Title} property, and the meta tags registered via
* {@link registerMetaTag}. Stylesheet and JavaScripts registered via
* {@link TClientScriptManager::registerStyleSheet}, {@link TClientScriptManager::registerStyleSheetFile}
* {@link TClientScriptManager::registerHeadJavaScript}, and
* {@link TClientScriptManager::registerHeadJavaScriptFile} will also be displayed
* in the head.
*
* 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 once 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 <tanus@users.sourceforge.net> and Qiang Xue <qiang.xue@gmail.com>
* @version $Revision: $ $Date: $
* @package System.Web.UI.WebControls
* @since 3.0
*/
class THead extends TControl
{
/**
* @var array list of meta name tags to be loaded by {@link THead}
*/
private $_metaTags=array();
/**
* Registers the head control with the current page.
* This method is invoked when the control enters 'Init' stage.
* The method raises 'Init' event.
* If you override this method, be sure to call the parent implementation
* so that the event handlers can be invoked.
* @param TEventParameter event parameter to be passed to the event handlers
*/
protected function onInit($param)
{
parent::onInit($param);
$this->getPage()->setHead($this);
}
/**
* @return string the page title.
*/
public function getTitle()
{
if(($page=$this->getPage())===null)
return '';
else
return $page->getTitle();
}
/**
* Sets the page title. Note, if the page is not available, the title won't be set.
* Try to use {@link TPage::setTitle} instead in this case.
* @param string the page title.
*/
public function setTitle($value)
{
if(($page=$this->getPage())!==null)
$page->setTitle($value);
}
/**
* Registers a meta tag to be imported with the page body
* @param string a key that identifies the meta tag to avoid repetitive registration
* @param TMetaTag the meta tag to be registered
* @see isTagRegistered()
*/
public function registerMetaTag($key,$metaTag)
{
$this->_metaTags[$key]=$metaTag;
}
/**
* @param string a key identifying the meta tag.
* @return boolean whether the named meta tag has been registered before
* @see registerMetaTag()
*/
public function isMetaTagRegistered($key)
{
return isset($this->_metaTags[$key]);
}
/**
* Renders the head control.
* @param THtmlWriter the writer for rendering purpose.
*/
public function render($writer)
{
$writer->write("<head>\n<title>".THttpUtility::htmlEncode($this->getTitle())."</title>\n");
foreach($this->_metaTags as $metaTag)
{
$metaTag->render($writer);
$writer->writeLine();
}
$cs=$this->getPage()->getClientScript();
$cs->renderStyleSheetFiles($writer);
$cs->renderStyleSheets($writer);
$cs->renderHeadScriptFiles($writer);
$cs->renderHeadScripts($writer);
parent::render($writer);
$writer->write("</head>\n");
}
}
/**
* TMetaTag class.
*
* TMetaTag represents a meta tag appearing in a page head section.
* You can set its {@link setID ID}, {@link setHttpEquiv HttpEquiv},
* {@link setName Name}, {@link setContent Content}, {@link setScheme Scheme}
* properties, which correspond to id, http-equiv, name, content, and scheme
* attributes for a meta tag, respectively.
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @version $Revision: $ $Date: $
* @package System.Web.UI.WebControls
* @since 3.0
*/
class TMetaTag extends TComponent
{
/**
* @var string id of the meta tag
*/
private $_id='';
/**
* @var string http-equiv attribute of the meta tag
*/
private $_httpEquiv='';
/**
* @var string name attribute of the meta tag
*/
private $_name='';
/**
* @var string content attribute of the meta tag
*/
private $_content='';
/**
* @var string scheme attribute of the meta tag
*/
private $_scheme='';
/**
* @return string id of the meta tag
*/
public function getID()
{
return $this->_id;
}
/**
* @param string id of the meta tag
*/
public function setID($value)
{
$this->_id=$value;
}
/**
* @return string http-equiv attribute of the meta tag
*/
public function getHttpEquiv()
{
return $this->_httpEquiv;
}
/**
* @param string http-equiv attribute of the meta tag
*/
public function setHttpEquiv($value)
{
$this->_httpEquiv=$value;
}
/**
* @return string name attribute of the meta tag
*/
public function getName()
{
return $this->_name;
}
/**
* @param string name attribute of the meta tag
*/
public function setName($value)
{
$this->_name=$value;
}
/**
* @return string content attribute of the meta tag
*/
public function getContent()
{
return $this->_content;
}
/**
* @param string content attribute of the meta tag
*/
public function setContent($value)
{
$this->_content=$value;
}
/**
* @return string scheme attribute of the meta tag
*/
public function getScheme()
{
return $this->_scheme;
}
/**
* @param string scheme attribute of the meta tag
*/
public function setScheme($value)
{
$this->_scheme=$value;
}
/**
* Renders the meta tag.
* @param THtmlWriter writer for the rendering purpose
*/
public function render($writer)
{
if($this->_id!=='')
$writer->addAttribute('id',$this->_id);
if($this->_name!=='')
$writer->addAttribute('name',$this->_name);
if($this->_httpEquiv!=='')
$writer->addAttribute('http-equiv',$this->_name);
if($this->_scheme!=='')
$writer->addAttribute('scheme',$this->_name);
$writer->addAttribute('content',$this->_name);
$writer->renderBeginTag('meta');
$writer->renderEndTag();
}
}
?>
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