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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 © 2005-2014 PradoSoft
* @license http://www.pradosoft.com/license/
* @package Prado\Web\UI\WebControls
*/
namespace Prado\Web\UI\WebControls;
use Prado\Web\THttpUtility;
/**
* 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,
* <code>
* <com:THead>
* <com:TMetaTag HttpEquiv="Pragma" Content="no-cache" />
* <com:TMetaTag Name="keywords" Content="Prado" />
* </com:THead>
* </code>
*
* 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 <tanus@users.sourceforge.net> and Qiang Xue <qiang.xue@gmail.com>
* @package Prado\Web\UI\WebControls
* @since 3.0
*/
class THead extends \Prado\Web\UI\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 <base> tag. Defaults to ''.
*/
public function getBaseUrl()
{
return $this->getViewState('BaseUrl','');
}
/**
* @param string base URL of the page. This URL is rendered as the 'href' attribute of <base> tag.
*/
public function setBaseUrl($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();
$writer->write("<head>\n<title>".THttpUtility::htmlEncode($title)."</title>\n");
if(($baseUrl=$this->getBaseUrl())!=='')
$writer->write('<base href="'.$baseUrl."\" />\n");
if(($icon=$this->getShortcutIcon())!=='')
$writer->write('<link rel="shortcut icon" href="'.$icon."\" />\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("</head>\n");
}
}
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