* Prado 3.3.0

1 files changed, 1318 insertions, 0 deletions

diff --git a/lib/prado/framework/Web/UI/TPage.php b/lib/prado/framework/Web/UI/TPage.php
new file mode 100644
index 0000000..f1ae591
--- /dev/null
+++ b/lib/prado/framework/Web/UI/TPage.php
@@ -0,0 +1,1318 @@
+<?php
+/**
+ * TPage class file
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @link https://github.com/pradosoft/prado
+ * @copyright Copyright &copy; 2005-2015 The PRADO Group
+ * @license https://github.com/pradosoft/prado/blob/master/COPYRIGHT
+ * @package System.Web.UI
+ */
+
+Prado::using('System.Web.UI.WebControls.*');
+Prado::using('System.Web.UI.TControl');
+Prado::using('System.Web.UI.WebControls.TWebControl');
+Prado::using('System.Web.UI.TCompositeControl');
+Prado::using('System.Web.UI.TTemplateControl');
+Prado::using('System.Web.UI.TForm');
+Prado::using('System.Web.UI.TClientScriptManager');
+
+/**
+ * TPage class
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @package System.Web.UI
+ * @since 3.0
+ */
+class TPage extends TTemplateControl
+{
+	/**
+	 * system post fields
+	 */
+	const FIELD_POSTBACK_TARGET='PRADO_POSTBACK_TARGET';
+	const FIELD_POSTBACK_PARAMETER='PRADO_POSTBACK_PARAMETER';
+	const FIELD_LASTFOCUS='PRADO_LASTFOCUS';
+	const FIELD_PAGESTATE='PRADO_PAGESTATE';
+	const FIELD_CALLBACK_TARGET='PRADO_CALLBACK_TARGET';
+	const FIELD_CALLBACK_PARAMETER='PRADO_CALLBACK_PARAMETER';
+
+	/**
+	 * @var array system post fields
+	 */
+	private static $_systemPostFields=array(
+		'PRADO_POSTBACK_TARGET'=>true,
+		'PRADO_POSTBACK_PARAMETER'=>true,
+		'PRADO_LASTFOCUS'=>true,
+		'PRADO_PAGESTATE'=>true,
+		'PRADO_CALLBACK_TARGET'=>true,
+		'PRADO_CALLBACK_PARAMETER'=>true
+	);
+	/**
+	 * @var TForm form instance
+	 */
+	private $_form;
+	/**
+	 * @var THead head instance
+	 */
+	private $_head;
+	/**
+	 * @var array list of registered validators
+	 */
+	private $_validators=array();
+	/**
+	 * @var boolean if validation has been performed
+	 */
+	private $_validated=false;
+	/**
+	 * @var TTheme page theme
+	 */
+	private $_theme;
+	/**
+	 * @var string page title set when Head is not in page yet
+	 */
+	private $_title;
+	/**
+	 * @var TTheme page stylesheet theme
+	 */
+	private $_styleSheet;
+	/**
+	 * @var TClientScriptManager client script manager
+	 */
+	private $_clientScript;
+	/**
+	 * @var TMap data post back by user
+	 */
+	protected $_postData;
+	/**
+	 * @var TMap postback data that is not handled during first invocation of LoadPostData.
+	 */
+	protected $_restPostData;
+	/**
+	 * @var array list of controls whose data have been changed due to the postback
+	 */
+	protected $_controlsPostDataChanged=array();
+	/**
+	 * @var array list of controls that need to load post data in the current request
+	 */
+	protected $_controlsRequiringPostData=array();
+	/**
+	 * @var array list of controls that need to load post data in the next postback
+	 */
+	protected $_controlsRegisteredForPostData=array();
+	/**
+	 * @var TControl control that needs to raise postback event
+	 */
+	private $_postBackEventTarget;
+	/**
+	 * @var string postback event parameter
+	 */
+	private $_postBackEventParameter;
+	/**
+	 * @var boolean whether the form has been rendered
+	 */
+	protected $_formRendered=false;
+	/**
+	 * @var boolean whether the current rendering is within a form
+	 */
+	protected $_inFormRender=false;
+	/**
+	 * @var TControl|string the control or the ID of the element on the page to be focused when the page is sent back to user
+	 */
+	private $_focus;
+	/**
+	 * @var string page path to this page
+	 */
+	private $_pagePath='';
+	/**
+	 * @var boolean whether page state should be HMAC validated
+	 */
+	private $_enableStateValidation=true;
+	/**
+	 * @var boolean whether page state should be encrypted
+	 */
+	private $_enableStateEncryption=false;
+	/**
+	 * @var boolean whether page state should be compressed
+	 * @since 3.1.6
+	 */
+	private $_enableStateCompression=true;
+	/**
+	 * @var string page state persister class name
+	 */
+	private $_statePersisterClass='System.Web.UI.TPageStatePersister';
+	/**
+	 * @var mixed page state persister
+	 */
+	private $_statePersister;
+	/**
+	 * @var TStack stack used to store currently active caching controls
+	 */
+	private $_cachingStack;
+	/**
+	 * @var string state string to be stored on the client side
+	 */
+	private $_clientState='';
+	/**
+	 * @var boolean true if loading post data.
+	 */
+	protected $_isLoadingPostData=false;
+	/**
+	 * @var boolean whether client supports javascript
+	 */
+	private $_enableJavaScript=true;
+	/**
+	 * @var THtmlWriter current html render writer
+	 */
+	private $_writer;
+
+	/**
+	 * Constructor.
+	 * Sets the page object to itself.
+	 * Derived classes must call parent implementation.
+	 */
+	public function __construct()
+	{
+		$this->setPage($this);
+	}
+
+	/**
+	 * Runs through the page lifecycles.
+	 * @param THtmlTextWriter the HTML writer
+	 */
+	public function run($writer)
+	{
+		Prado::trace("Running page life cycles",'System.Web.UI.TPage');
+		$this->_writer = $writer;
+
+		$this->determinePostBackMode();
+
+		if($this->getIsPostBack())
+		{
+			if($this->getIsCallback())
+				$this->processCallbackRequest($writer);
+			else
+				$this->processPostBackRequest($writer);
+		}
+		else
+			$this->processNormalRequest($writer);
+
+		$this->_writer = null;
+	}
+
+	protected function processNormalRequest($writer)
+	{
+		Prado::trace("Page onPreInit()",'System.Web.UI.TPage');
+		$this->onPreInit(null);
+
+		Prado::trace("Page initRecursive()",'System.Web.UI.TPage');
+		$this->initRecursive();
+
+		Prado::trace("Page onInitComplete()",'System.Web.UI.TPage');
+		$this->onInitComplete(null);
+
+		Prado::trace("Page onPreLoad()",'System.Web.UI.TPage');
+		$this->onPreLoad(null);
+		Prado::trace("Page loadRecursive()",'System.Web.UI.TPage');
+		$this->loadRecursive();
+		Prado::trace("Page onLoadComplete()",'System.Web.UI.TPage');
+		$this->onLoadComplete(null);
+
+		Prado::trace("Page preRenderRecursive()",'System.Web.UI.TPage');
+		$this->preRenderRecursive();
+		Prado::trace("Page onPreRenderComplete()",'System.Web.UI.TPage');
+		$this->onPreRenderComplete(null);
+
+		Prado::trace("Page savePageState()",'System.Web.UI.TPage');
+		$this->savePageState();
+		Prado::trace("Page onSaveStateComplete()",'System.Web.UI.TPage');
+		$this->onSaveStateComplete(null);
+
+		Prado::trace("Page renderControl()",'System.Web.UI.TPage');
+		$this->renderControl($writer);
+		Prado::trace("Page unloadRecursive()",'System.Web.UI.TPage');
+		$this->unloadRecursive();
+	}
+
+	protected function processPostBackRequest($writer)
+	{
+		Prado::trace("Page onPreInit()",'System.Web.UI.TPage');
+		$this->onPreInit(null);
+
+		Prado::trace("Page initRecursive()",'System.Web.UI.TPage');
+		$this->initRecursive();
+
+		Prado::trace("Page onInitComplete()",'System.Web.UI.TPage');
+		$this->onInitComplete(null);
+
+		$this->_restPostData=new TMap;
+		Prado::trace("Page loadPageState()",'System.Web.UI.TPage');
+		$this->loadPageState();
+		Prado::trace("Page processPostData()",'System.Web.UI.TPage');
+		$this->processPostData($this->_postData,true);
+		Prado::trace("Page onPreLoad()",'System.Web.UI.TPage');
+		$this->onPreLoad(null);
+		Prado::trace("Page loadRecursive()",'System.Web.UI.TPage');
+		$this->loadRecursive();
+		Prado::trace("Page processPostData()",'System.Web.UI.TPage');
+		$this->processPostData($this->_restPostData,false);
+		Prado::trace("Page raiseChangedEvents()",'System.Web.UI.TPage');
+		$this->raiseChangedEvents();
+		Prado::trace("Page raisePostBackEvent()",'System.Web.UI.TPage');
+		$this->raisePostBackEvent();
+		Prado::trace("Page onLoadComplete()",'System.Web.UI.TPage');
+		$this->onLoadComplete(null);
+
+		Prado::trace("Page preRenderRecursive()",'System.Web.UI.TPage');
+		$this->preRenderRecursive();
+		Prado::trace("Page onPreRenderComplete()",'System.Web.UI.TPage');
+		$this->onPreRenderComplete(null);
+
+		Prado::trace("Page savePageState()",'System.Web.UI.TPage');
+		$this->savePageState();
+		Prado::trace("Page onSaveStateComplete()",'System.Web.UI.TPage');
+		$this->onSaveStateComplete(null);
+
+		Prado::trace("Page renderControl()",'System.Web.UI.TPage');
+		$this->renderControl($writer);
+		Prado::trace("Page unloadRecursive()",'System.Web.UI.TPage');
+		$this->unloadRecursive();
+	}
+
+	protected static function decodeUTF8($data, $enc)
+	{
+		if(is_array($data))
+		{
+			foreach($data as $k=>$v)
+				$data[$k]=self::decodeUTF8($v, $enc);
+			return $data;
+		} elseif(is_string($data)) {
+			return iconv('UTF-8',$enc.'//IGNORE',$data);
+		} else {
+			return $data;
+		}
+	}
+
+	/**
+	 * Sets Adapter to TActivePageAdapter and calls apter to process the
+	 * callback request.
+	 */
+	protected function processCallbackRequest($writer)
+	{
+		Prado::using('System.Web.UI.ActiveControls.TActivePageAdapter');
+		Prado::using('System.Web.UI.JuiControls.TJuiControlOptions');
+
+		$this->setAdapter(new TActivePageAdapter($this));
+
+        $callbackEventParameter = $this->getRequest()->itemAt(TPage::FIELD_CALLBACK_PARAMETER);
+        if(strlen($callbackEventParameter) > 0)
+            $this->_postData[TPage::FIELD_CALLBACK_PARAMETER]=TJavaScript::jsonDecode((string)$callbackEventParameter);
+
+        // Decode Callback postData from UTF-8 to current Charset
+        if (($g=$this->getApplication()->getGlobalization(false))!==null &&
+            strtoupper($enc=$g->getCharset())!='UTF-8')
+                foreach ($this->_postData as $k=>$v)
+                	$this->_postData[$k]=self::decodeUTF8($v, $enc);
+
+		Prado::trace("Page onPreInit()",'System.Web.UI.TPage');
+		$this->onPreInit(null);
+
+		Prado::trace("Page initRecursive()",'System.Web.UI.TPage');
+		$this->initRecursive();
+
+		Prado::trace("Page onInitComplete()",'System.Web.UI.TPage');
+		$this->onInitComplete(null);
+
+		$this->_restPostData=new TMap;
+		Prado::trace("Page loadPageState()",'System.Web.UI.TPage');
+		$this->loadPageState();
+		Prado::trace("Page processPostData()",'System.Web.UI.TPage');
+		$this->processPostData($this->_postData,true);
+		Prado::trace("Page onPreLoad()",'System.Web.UI.TPage');
+		$this->onPreLoad(null);
+		Prado::trace("Page loadRecursive()",'System.Web.UI.TPage');
+		$this->loadRecursive();
+
+		Prado::trace("Page processPostData()",'System.Web.UI.TPage');
+		$this->processPostData($this->_restPostData,false);
+
+		Prado::trace("Page raiseChangedEvents()",'System.Web.UI.TPage');
+		$this->raiseChangedEvents();
+
+
+		$this->getAdapter()->processCallbackEvent($writer);
+
+/*
+		Prado::trace("Page raisePostBackEvent()",'System.Web.UI.TPage');
+		$this->raisePostBackEvent();
+*/
+		Prado::trace("Page onLoadComplete()",'System.Web.UI.TPage');
+		$this->onLoadComplete(null);
+
+		Prado::trace("Page preRenderRecursive()",'System.Web.UI.TPage');
+		$this->preRenderRecursive();
+		Prado::trace("Page onPreRenderComplete()",'System.Web.UI.TPage');
+		$this->onPreRenderComplete(null);
+
+		Prado::trace("Page savePageState()",'System.Web.UI.TPage');
+		$this->savePageState();
+		Prado::trace("Page onSaveStateComplete()",'System.Web.UI.TPage');
+		$this->onSaveStateComplete(null);
+
+/*
+		Prado::trace("Page renderControl()",'System.Web.UI.TPage');
+		$this->renderControl($writer);
+*/
+		$this->getAdapter()->renderCallbackResponse($writer);
+
+		Prado::trace("Page unloadRecursive()",'System.Web.UI.TPage');
+		$this->unloadRecursive();
+	}
+
+	/**
+	 * Gets the callback client script handler that allows javascript functions
+	 * to be executed during the callback response.
+	 * @return TCallbackClientScript interface to client-side javascript code.
+	 */
+	public function getCallbackClient()
+	{
+		if($this->getAdapter() !== null)
+			return $this->getAdapter()->getCallbackClientHandler();
+		else
+			return new TCallbackClientScript();
+	}
+
+	/**
+	 * Set a new callback client handler.
+	 * @param TCallbackClientScript new callback client script handler.
+	 */
+	public function setCallbackClient($client)
+	{
+		$this->getAdapter()->setCallbackClientHandler($client);
+	}
+
+	/**
+	 * @return TControl the control responsible for the current callback event,
+	 * null if nonexistent
+	 */
+	public function getCallbackEventTarget()
+	{
+		return $this->getAdapter()->getCallbackEventTarget();
+	}
+
+	/**
+	 * Registers a control to raise callback event in the current request.
+	 * @param TControl control registered to raise callback event.
+	 */
+	public function setCallbackEventTarget(TControl $control)
+	{
+		$this->getAdapter()->setCallbackEventTarget($control);
+	}
+
+	/**
+	 * Callback parameter is decoded assuming JSON encoding.
+	 * @return string callback event parameter
+	 */
+	public function getCallbackEventParameter()
+	{
+		return $this->getAdapter()->getCallbackEventParameter();
+	}
+
+	/**
+	 * @param mixed callback event parameter
+	 */
+	public function setCallbackEventParameter($value)
+	{
+		$this->getAdapter()->setCallbackEventParameter($value);
+	}
+
+	/**
+	 * @return TForm the form on the page
+	 */
+	public function getForm()
+	{
+		return $this->_form;
+	}
+
+	/**
+	 * Registers a TForm instance to the page.
+	 * Note, a page can contain at most one TForm instance.
+	 * @param TForm the form on the page
+	 * @throws TInvalidOperationException if this method is invoked twice or more.
+	 */
+	public function setForm(TForm $form)
+	{
+		if($this->_form===null)
+			$this->_form=$form;
+		else
+			throw new TInvalidOperationException('page_form_duplicated');
+	}
+
+	/**
+	 * Returns a list of registered validators.
+	 * If validation group is specified, only the validators in that group will be returned.
+	 * @param string validation group
+	 * @return TList registered validators in the requested group. If the group is null, all validators will be returned.
+	 */
+	public function getValidators($validationGroup=null)
+	{
+		if(!$this->_validators)
+			$this->_validators=new TList;
+		if(empty($validationGroup) === true)
+			return $this->_validators;
+		else
+		{
+			$list=new TList;
+			foreach($this->_validators as $validator)
+				if($validator->getValidationGroup()===$validationGroup)
+					$list->add($validator);
+			return $list;
+		}
+	}
+
+	/**
+	 * Performs input validation.
+	 * This method will invoke the registered validators to perform the actual validation.
+	 * If validation group is specified, only the validators in that group will be invoked.
+	 * @param string validation group. If null, all validators will perform validation.
+	 */
+	public function validate($validationGroup=null)
+	{
+		Prado::trace("Page validate()",'System.Web.UI.TPage');
+		$this->_validated=true;
+		if($this->_validators && $this->_validators->getCount())
+		{
+			if($validationGroup===null)
+			{
+				foreach($this->_validators as $validator)
+					$validator->validate();
+			}
+			else
+			{
+				foreach($this->_validators as $validator)
+				{
+					if($validator->getValidationGroup()===$validationGroup)
+						$validator->validate();
+				}
+			}
+		}
+	}
+
+	/**
+	 * Returns whether user input is valid or not.
+	 * This method must be invoked after {@link validate} is called.
+	 * @return boolean whether the user input is valid or not.
+	 * @throws TInvalidOperationException if {@link validate} is not invoked yet.
+	 */
+	public function getIsValid()
+	{
+		if($this->_validated)
+		{
+			if($this->_validators && $this->_validators->getCount())
+			{
+				foreach($this->_validators as $validator)
+					if(!$validator->getIsValid())
+						return false;
+			}
+			return true;
+		}
+		else
+			throw new TInvalidOperationException('page_isvalid_unknown');
+	}
+
+	/**
+	 * @return TTheme the theme used for the page. Defaults to null.
+	 */
+	public function getTheme()
+	{
+		if(is_string($this->_theme))
+			$this->_theme=$this->getService()->getThemeManager()->getTheme($this->_theme);
+		return $this->_theme;
+	}
+
+	/**
+	 * Sets the theme to be used for the page.
+	 * @param string|TTheme the theme name or the theme object to be used for the page.
+	 */
+	public function setTheme($value)
+	{
+		$this->_theme=empty($value)?null:$value;
+	}
+
+
+	/**
+	 * @return TTheme the stylesheet theme used for the page. Defaults to null.
+	 */
+	public function getStyleSheetTheme()
+	{
+		if(is_string($this->_styleSheet))
+			$this->_styleSheet=$this->getService()->getThemeManager()->getTheme($this->_styleSheet);
+		return $this->_styleSheet;
+	}
+
+	/**
+	 * Sets the stylesheet theme to be used for the page.
+	 * @param string|TTheme the stylesheet theme name or the stylesheet theme object to be used for the page.
+	 */
+	public function setStyleSheetTheme($value)
+	{
+		$this->_styleSheet=empty($value)?null:$value;
+	}
+
+	/**
+	 * Applies a skin in the current theme to a control.
+	 * This method should only be used by framework developers.
+	 * @param TControl a control to be applied skin with
+	 */
+	public function applyControlSkin($control)
+	{
+		if(($theme=$this->getTheme())!==null)
+			$theme->applySkin($control);
+	}
+
+	/**
+	 * Applies a stylesheet skin in the current theme to a control.
+	 * This method should only be used by framework developers.
+	 * @param TControl a control to be applied stylesheet skin with
+	 */
+	public function applyControlStyleSheet($control)
+	{
+		if(($theme=$this->getStyleSheetTheme())!==null)
+			$theme->applySkin($control);
+	}
+
+	/**
+	 * @return TClientScriptManager client script manager
+	 */
+	public function getClientScript()
+	{
+		if(!$this->_clientScript) {
+			$className = $classPath = $this->getService()->getClientScriptManagerClass();
+			Prado::using($className);
+			if(($pos=strrpos($className,'.'))!==false)
+				$className=substr($className,$pos+1);
+
+ 			if(!class_exists($className,false) || ($className!=='TClientScriptManager' && !is_subclass_of($className,'TClientScriptManager')))
+				throw new THttpException(404,'page_csmanagerclass_invalid',$classPath);
+
+			$this->_clientScript=new $className($this);
+		}
+		return $this->_clientScript;
+	}
+
+	/**
+	 * Raises OnPreInit event.
+	 * This method is invoked right before {@link onInit OnInit} stage.
+	 * You may override this method to provide additional initialization that
+	 * should be done before {@link onInit OnInit} (e.g. setting {@link setTheme Theme} or
+	 * {@link setStyleSheetTheme StyleSheetTheme}).
+	 * Remember to call the parent implementation to ensure OnPreInit event is raised.
+	 * @param mixed event parameter
+	 */
+	public function onPreInit($param)
+	{
+		$this->raiseEvent('OnPreInit',$this,$param);
+	}
+
+	/**
+	 * Raises OnInitComplete event.
+	 * This method is invoked right after {@link onInit OnInit} stage and before {@link onLoad OnLoad} stage.
+	 * You may override this method to provide additional initialization that
+	 * should be done after {@link onInit OnInit}.
+	 * Remember to call the parent implementation to ensure OnInitComplete event is raised.
+	 * @param mixed event parameter
+	 */
+	public function onInitComplete($param)
+	{
+		$this->raiseEvent('OnInitComplete',$this,$param);
+	}
+
+	/**
+	 * Raises OnPreLoad event.
+	 * This method is invoked right before {@link onLoad OnLoad} stage.
+	 * You may override this method to provide additional page loading logic that
+	 * should be done before {@link onLoad OnLoad}.
+	 * Remember to call the parent implementation to ensure OnPreLoad event is raised.
+	 * @param mixed event parameter
+	 */
+	public function onPreLoad($param)
+	{
+		$this->raiseEvent('OnPreLoad',$this,$param);
+	}
+
+	/**
+	 * Raises OnLoadComplete event.
+	 * This method is invoked right after {@link onLoad OnLoad} stage.
+	 * You may override this method to provide additional page loading logic that
+	 * should be done after {@link onLoad OnLoad}.
+	 * Remember to call the parent implementation to ensure OnLoadComplete event is raised.
+	 * @param mixed event parameter
+	 */
+	public function onLoadComplete($param)
+	{
+		$this->raiseEvent('OnLoadComplete',$this,$param);
+	}
+
+	/**
+	 * Raises OnPreRenderComplete event.
+	 * This method is invoked right after {@link onPreRender OnPreRender} stage.
+	 * You may override this method to provide additional preparation for page rendering
+	 * that should be done after {@link onPreRender OnPreRender}.
+	 * Remember to call the parent implementation to ensure OnPreRenderComplete event is raised.
+	 * @param mixed event parameter
+	 */
+	public function onPreRenderComplete($param)
+	{
+		$this->raiseEvent('OnPreRenderComplete',$this,$param);
+		$cs=$this->getClientScript();
+		$theme=$this->getTheme();
+		if($theme instanceof ITheme)
+		{
+			foreach($theme->getStyleSheetFiles() as $url)
+				$cs->registerStyleSheetFile($url,$url,$this->getCssMediaType($url));
+			foreach($theme->getJavaScriptFiles() as $url)
+				$cs->registerHeadScriptFile($url,$url);
+		}
+		$styleSheet=$this->getStyleSheetTheme();
+		if($styleSheet instanceof ITheme)
+		{
+			foreach($styleSheet->getStyleSheetFiles() as $url)
+				$cs->registerStyleSheetFile($url,$url,$this->getCssMediaType($url));
+			foreach($styleSheet->getJavaScriptFiles() as $url)
+				$cs->registerHeadScriptFile($url,$url);
+		}
+
+		if($cs->getRequiresHead() && $this->getHead()===null)
+			throw new TConfigurationException('page_head_required');
+	}
+
+	/**
+	 * Determines the media type of the CSS file.
+	 * The media type is determined according to the following file name pattern:
+	 *        xxx.media-type.extension
+	 * For example, 'mystyle.print.css' means its media type is 'print'.
+	 * @param string CSS URL
+	 * @return string media type of the CSS file
+	 */
+	private function getCssMediaType($url)
+	{
+		$segs=explode('.',basename($url));
+		if(isset($segs[2]))
+			return $segs[count($segs)-2];
+		else
+			return '';
+	}
+
+	/**
+	 * Raises OnSaveStateComplete event.
+	 * This method is invoked right after {@link onSaveState OnSaveState} stage.
+	 * You may override this method to provide additional logic after page state is saved.
+	 * Remember to call the parent implementation to ensure OnSaveStateComplete event is raised.
+	 * @param mixed event parameter
+	 */
+	public function onSaveStateComplete($param)
+	{
+		$this->raiseEvent('OnSaveStateComplete',$this,$param);
+	}
+
+	/**
+	 * Determines whether the current page request is a postback.
+	 * Call {@link getIsPostBack} to get the result.
+	 */
+	private function determinePostBackMode()
+	{
+		$postData=$this->getRequest();
+		if($postData->contains(self::FIELD_PAGESTATE) || $postData->contains(self::FIELD_POSTBACK_TARGET))
+			$this->_postData=$postData;
+	}
+
+	/**
+	 * @return boolean whether the current page request is a postback
+	 */
+	public function getIsPostBack()
+	{
+		return $this->_postData!==null;
+	}
+
+	/**
+	 * @return boolean whether this is a callback request
+	 */
+	public function getIsCallback()
+	{
+		return $this->getIsPostBack() && $this->getRequest()->contains(self::FIELD_CALLBACK_TARGET);
+	}
+
+	/**
+	 * This method is invoked when control state is to be saved.
+	 * You can override this method to do last step state saving.
+	 * Parent implementation must be invoked.
+	 */
+	public function saveState()
+	{
+		parent::saveState();
+		$this->setViewState('ControlsRequiringPostBack',$this->_controlsRegisteredForPostData,array());
+	}
+
+	/**
+	 * This method is invoked right after the control has loaded its state.
+	 * You can override this method to initialize data from the control state.
+	 * Parent implementation must be invoked.
+	 */
+	public function loadState()
+	{
+		parent::loadState();
+		$this->_controlsRequiringPostData=$this->getViewState('ControlsRequiringPostBack',array());
+	}
+
+	/**
+	 * Loads page state from persistent storage.
+	 */
+	protected function loadPageState()
+	{
+		Prado::trace("Loading state",'System.Web.UI.TPage');
+		$state=$this->getStatePersister()->load();
+		$this->loadStateRecursive($state,$this->getEnableViewState());
+	}
+
+	/**
+	 * Saves page state from persistent storage.
+	 */
+	protected function savePageState()
+	{
+		Prado::trace("Saving state",'System.Web.UI.TPage');
+		$state=&$this->saveStateRecursive($this->getEnableViewState());
+		$this->getStatePersister()->save($state);
+	}
+
+	/**
+	 * @param string the field name
+	 * @return boolean whether the specified field is a system field in postback data
+	 */
+	protected function isSystemPostField($field)
+	{
+		return isset(self::$_systemPostFields[$field]);
+	}
+
+	/**
+	 * Registers a control for loading post data in the next postback.
+	 * This method needs to be invoked if the control to load post data
+	 * may not have a post variable in some cases. For example, a checkbox,
+	 * if not checked, will not have a post value.
+	 * @param TControl control registered for loading post data
+	 */
+	public function registerRequiresPostData($control)
+	{
+		$id=is_string($control)?$control:$control->getUniqueID();
+		$this->_controlsRegisteredForPostData[$id]=true;
+		$params=func_get_args();
+		foreach($this->getCachingStack() as $item)
+			$item->registerAction('Page','registerRequiresPostData',array($id));
+	}
+
+	/**
+	 * @return TControl the control responsible for the current postback event, null if nonexistent
+	 */
+	public function getPostBackEventTarget()
+	{
+		if($this->_postBackEventTarget===null && $this->_postData!==null)
+		{
+			$eventTarget=$this->_postData->itemAt(self::FIELD_POSTBACK_TARGET);
+			if(!empty($eventTarget))
+				$this->_postBackEventTarget=$this->findControl($eventTarget);
+		}
+		return $this->_postBackEventTarget;
+	}
+
+	/**
+	 * Registers a control to raise postback event in the current request.
+	 * @param TControl control registered to raise postback event.
+	 */
+	public function setPostBackEventTarget(TControl $control)
+	{
+		$this->_postBackEventTarget=$control;
+	}
+
+	/**
+	 * @return string postback event parameter
+	 */
+	public function getPostBackEventParameter()
+	{
+		if($this->_postBackEventParameter===null && $this->_postData!==null)
+		{
+			if(($this->_postBackEventParameter=$this->_postData->itemAt(self::FIELD_POSTBACK_PARAMETER))===null)
+				$this->_postBackEventParameter='';
+		}
+		return $this->_postBackEventParameter;
+	}
+
+	/**
+	 * @param string postback event parameter
+	 */
+	public function setPostBackEventParameter($value)
+	{
+		$this->_postBackEventParameter=$value;
+	}
+
+	/**
+	 * Processes post data.
+	 * @param TMap post data to be processed
+	 * @param boolean whether this method is invoked before {@link onLoad OnLoad}.
+	 */
+	protected function processPostData($postData,$beforeLoad)
+	{
+		$this->_isLoadingPostData=true;
+		if($beforeLoad)
+			$this->_restPostData=new TMap;
+		foreach($postData as $key=>$value)
+		{
+			if($this->isSystemPostField($key))
+				continue;
+			else if($control=$this->findControl($key))
+			{
+				if($control instanceof IPostBackDataHandler)
+				{
+					if($control->loadPostData($key,$postData))
+						$this->_controlsPostDataChanged[]=$control;
+				}
+				else if($control instanceof IPostBackEventHandler &&
+					empty($this->_postData[self::FIELD_POSTBACK_TARGET]))
+				{
+					$this->_postData->add(self::FIELD_POSTBACK_TARGET,$key);  // not calling setPostBackEventTarget() because the control may be removed later
+				}
+				unset($this->_controlsRequiringPostData[$key]);
+			}
+			else if($beforeLoad)
+				$this->_restPostData->add($key,$value);
+		}
+
+		foreach($this->_controlsRequiringPostData as $key=>$value)
+		{
+			if($control=$this->findControl($key))
+			{
+				if($control instanceof IPostBackDataHandler)
+				{
+					if($control->loadPostData($key,$this->_postData))
+						$this->_controlsPostDataChanged[]=$control;
+				}
+				else
+					throw new TInvalidDataValueException('page_postbackcontrol_invalid',$key);
+				unset($this->_controlsRequiringPostData[$key]);
+			}
+		}
+		$this->_isLoadingPostData=false;
+	}
+
+	/**
+	 * @return boolean true if loading post data.
+	 */
+	public function getIsLoadingPostData()
+	{
+		return $this->_isLoadingPostData;
+	}
+
+	/**
+	 * Raises OnPostDataChangedEvent for controls whose data have been changed due to the postback.
+	 */
+	protected function raiseChangedEvents()
+	{
+		foreach($this->_controlsPostDataChanged as $control)
+			$control->raisePostDataChangedEvent();
+	}
+
+	/**
+	 * Raises PostBack event.
+	 */
+	protected function raisePostBackEvent()
+	{
+		if(($postBackHandler=$this->getPostBackEventTarget())===null)
+			$this->validate();
+		else if($postBackHandler instanceof IPostBackEventHandler)
+			$postBackHandler->raisePostBackEvent($this->getPostBackEventParameter());
+	}
+
+	/**
+	 * @return boolean Whether form rendering is in progress
+	 */
+	public function getInFormRender()
+	{
+		return $this->_inFormRender;
+	}
+
+	/**
+	 * Ensures the control is rendered within a form.
+	 * @param TControl the control to be rendered
+	 * @throws TConfigurationException if the control is outside of the form
+	 */
+	public function ensureRenderInForm($control)
+	{
+		if(!$this->getIsCallback() && !$this->_inFormRender)
+			throw new TConfigurationException('page_control_outofform',get_class($control), $control ? $control->getUniqueID() : null);
+	}
+
+	/**
+	 * @internal This method is invoked by TForm at the beginning of its rendering
+	 */
+	public function beginFormRender($writer)
+	{
+		if($this->_formRendered)
+			throw new TConfigurationException('page_form_duplicated');
+		$this->_formRendered=true;
+		$this->getClientScript()->registerHiddenField(self::FIELD_PAGESTATE,$this->getClientState());
+		$this->_inFormRender=true;
+	}
+
+	/**
+	 * @internal This method is invoked by TForm  at the end of its rendering
+	 */
+	public function endFormRender($writer)
+	{
+		if($this->_focus)
+		{
+			if(($this->_focus instanceof TControl) && $this->_focus->getVisible(true))
+				$focus=$this->_focus->getClientID();
+			else
+				$focus=$this->_focus;
+			$this->getClientScript()->registerFocusControl($focus);
+		}
+		else if($this->_postData && ($lastFocus=$this->_postData->itemAt(self::FIELD_LASTFOCUS))!==null)
+			$this->getClientScript()->registerFocusControl($lastFocus);
+		$this->_inFormRender=false;
+	}
+
+	/**
+	 * Sets input focus on a control after the page is rendered to users.
+	 * @param TControl|string control to receive focus, or the ID of the element on the page to receive focus
+	 */
+	public function setFocus($value)
+	{
+		$this->_focus=$value;
+	}
+
+	/**
+	 * @return boolean whether client supports javascript. Defaults to true.
+	 */
+	public function getClientSupportsJavaScript()
+	{
+		return $this->_enableJavaScript;
+	}
+
+	/**
+	 * @param boolean whether client supports javascript. If false, javascript will not be generated for controls.
+	 */
+	public function setClientSupportsJavaScript($value)
+	{
+		$this->_enableJavaScript=TPropertyValue::ensureBoolean($value);
+	}
+
+	/**
+	 * @return THead page head, null if not available
+	 */
+	public function getHead()
+	{
+		return $this->_head;
+	}
+
+	/**
+	 * @param THead page head
+	 * @throws TInvalidOperationException if a head already exists
+	 */
+	public function setHead(THead $value)
+	{
+		if($this->_head)
+			throw new TInvalidOperationException('page_head_duplicated');
+		$this->_head=$value;
+		if($this->_title!==null)
+		{
+			$this->_head->setTitle($this->_title);
+			$this->_title=null;
+		}
+	}
+
+	/**
+	 * @return string page title.
+	 */
+	public function getTitle()
+	{
+		if($this->_head)
+			return $this->_head->getTitle();
+		else
+			return $this->_title===null ? '' : $this->_title;
+	}
+
+	/**
+	 * Sets the page title.
+	 * Note, a {@link THead} control needs to place on the page
+	 * in order that this title be rendered.
+	 * @param string page title. This will override the title set in {@link getHead Head}.
+	 */
+	public function setTitle($value)
+	{
+		if($this->_head)
+			$this->_head->setTitle($value);
+		else
+			$this->_title=$value;
+	}
+
+	/**
+	 * Returns the state to be stored on the client side.
+	 * This method should only be used by framework and control developers.
+	 * @return string the state to be stored on the client side
+	 */
+	public function getClientState()
+	{
+		return $this->_clientState;
+	}
+
+	/**
+	 * Sets the state to be stored on the client side.
+	 * This method should only be used by framework and control developers.
+	 * @param string the state to be stored on the client side
+	 */
+	public function setClientState($state)
+	{
+		$this->_clientState=$state;
+	}
+
+	/**
+	 * @return string the state postback from client side
+	 */
+	public function getRequestClientState()
+	{
+		return $this->getRequest()->itemAt(self::FIELD_PAGESTATE);
+	}
+
+	/**
+	 * @return string class name of the page state persister. Defaults to TPageStatePersister.
+	 */
+	public function getStatePersisterClass()
+	{
+		return $this->_statePersisterClass;
+	}
+
+	/**
+	 * @param string class name of the page state persister.
+	 */
+	public function setStatePersisterClass($value)
+	{
+		$this->_statePersisterClass=$value;
+	}
+
+	/**
+	 * @return IPageStatePersister page state persister
+	 */
+	public function getStatePersister()
+	{
+		if($this->_statePersister===null)
+		{
+			$this->_statePersister=Prado::createComponent($this->_statePersisterClass);
+			if(!($this->_statePersister instanceof IPageStatePersister))
+				throw new TInvalidDataTypeException('page_statepersister_invalid');
+			$this->_statePersister->setPage($this);
+		}
+		return $this->_statePersister;
+	}
+
+	/**
+	 * @return boolean whether page state should be HMAC validated. Defaults to true.
+	 */
+	public function getEnableStateValidation()
+	{
+		return $this->_enableStateValidation;
+	}
+
+	/**
+	 * @param boolean whether page state should be HMAC validated.
+	 */
+	public function setEnableStateValidation($value)
+	{
+		$this->_enableStateValidation=TPropertyValue::ensureBoolean($value);
+	}
+
+	/**
+	 * @return boolean whether page state should be encrypted. Defaults to false.
+	 */
+	public function getEnableStateEncryption()
+	{
+		return $this->_enableStateEncryption;
+	}
+
+	/**
+	 * @param boolean whether page state should be encrypted.
+	 */
+	public function setEnableStateEncryption($value)
+	{
+		$this->_enableStateEncryption=TPropertyValue::ensureBoolean($value);
+	}
+
+	/**
+	 * @return boolean whether page state should be compressed. Defaults to true.
+	 * @since 3.1.6
+	 */
+	public function getEnableStateCompression()
+	{
+		return $this->_enableStateCompression;
+	}
+
+	/**
+	 * @param boolean whether page state should be compressed.
+	 * @since 3.1.6
+	 */
+	public function setEnableStateCompression($value)
+	{
+		$this->_enableStateCompression=TPropertyValue::ensureBoolean($value);
+	}
+
+	/**
+	 * @return string the requested page path for this page
+	 */
+	public function getPagePath()
+	{
+		return $this->_pagePath;
+	}
+
+	/**
+	 * @param string the requested page path for this page
+	 */
+	public function setPagePath($value)
+	{
+		$this->_pagePath=$value;
+	}
+
+	/**
+	 * Registers an action associated with the content being cached.
+	 * The registered action will be replayed if the content stored
+	 * in the cache is served to end-users.
+	 * @param string context of the action method. This is a property-path
+	 * referring to the context object (e.g. Page, Page.ClientScript).
+	 * @param string method name of the context object
+	 * @param array list of parameters to be passed to the action method
+	 */
+	public function registerCachingAction($context,$funcName,$funcParams)
+	{
+		if($this->_cachingStack)
+		{
+			foreach($this->_cachingStack as $cache)
+				$cache->registerAction($context,$funcName,$funcParams);
+		}
+	}
+
+	/**
+	 * @return TStack stack of {@link TOutputCache} objects
+	 */
+	public function getCachingStack()
+	{
+		if(!$this->_cachingStack)
+			$this->_cachingStack=new TStack;
+		return $this->_cachingStack;
+	}
+
+	/**
+	 * Flushes output
+	 */
+	public function flushWriter()
+	{
+		if ($this->_writer)
+			$this->Response->write($this->_writer->flush());
+	}
+
+}
+
+/**
+ * IPageStatePersister interface.
+ *
+ * IPageStatePersister interface is required for all page state persister
+ * classes.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @package System.Web.UI
+ * @since 3.1
+ */
+interface IPageStatePersister
+{
+	/**
+	 * @param TPage the page that this persister works for
+	 */
+	public function getPage();
+	/**
+	 * @param TPage the page that this persister works for
+	 */
+	public function setPage(TPage $page);
+	/**
+	 * Saves state to persistent storage.
+	 * @param mixed state to be stored
+	 */
+	public function save($state);
+	/**
+	 * Loads page state from persistent storage
+	 * @return mixed the restored state
+	 */
+	public function load();
+}
+
+
+/**
+ * TPageStateFormatter class.
+ *
+ * TPageStateFormatter is a utility class to transform the page state
+ * into and from a string that can be properly saved in persistent storage.
+ *
+ * Depending on the {@link TPage::getEnableStateValidation() EnableStateValidation}
+ * and {@link TPage::getEnableStateEncryption() EnableStateEncryption},
+ * TPageStateFormatter may do HMAC validation and encryption to prevent
+ * the state data from being tampered or viewed.
+ * The private keys and hashing/encryption methods are determined by
+ * {@link TApplication::getSecurityManager() SecurityManager}.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @version $Revision: $  $Date: $
+ * @package System.Web.UI
+ * @since 3.1
+ */
+class TPageStateFormatter
+{
+	/**
+	 * @param TPage
+	 * @param mixed state data
+	 * @return string serialized data
+	 */
+	public static function serialize($page,$data)
+	{
+		$sm=$page->getApplication()->getSecurityManager();
+		if($page->getEnableStateValidation())
+			$str=$sm->hashData(serialize($data));
+		else
+			$str=serialize($data);
+		if($page->getEnableStateCompression() && extension_loaded('zlib'))
+			$str=gzcompress($str);
+		if($page->getEnableStateEncryption())
+			$str=$sm->encrypt($str);
+		return base64_encode($str);
+	}
+
+	/**
+	 * @param TPage
+	 * @param string serialized data
+	 * @return mixed unserialized state data, null if data is corrupted
+	 */
+	public static function unserialize($page,$data)
+	{
+		$str=base64_decode($data);
+		if($str==='')
+			return null;
+		if($str!==false)
+		{
+			$sm=$page->getApplication()->getSecurityManager();
+			if($page->getEnableStateEncryption())
+				$str=$sm->decrypt($str);
+			if($page->getEnableStateCompression() && extension_loaded('zlib'))
+				$str=@gzuncompress($str);
+			if($page->getEnableStateValidation())
+			{
+				if(($str=$sm->validateData($str))!==false)
+					return unserialize($str);
+			}
+			else
+				return unserialize($str);
+		}
+		return null;
+	}
+}