standardize the use of unix eol; use svn properties to enforce native eol

1 files changed, 575 insertions, 575 deletions

diff --git a/framework/Web/UI/ActiveControls/TActiveControlAdapter.php b/framework/Web/UI/ActiveControls/TActiveControlAdapter.php
index 8a0c8aec..7e7a82fe 100644
--- a/framework/Web/UI/ActiveControls/TActiveControlAdapter.php
+++ b/framework/Web/UI/ActiveControls/TActiveControlAdapter.php
@@ -1,575 +1,575 @@
-<?php

-/**

- * TActiveControlAdapter and TCallbackPageStateTracker class file.

- *

- * @author Wei Zhuo <weizhuo[at]gamil[dot]com>

- * @link http://www.pradosoft.com/

- * @copyright Copyright &copy; 2005-2012 PradoSoft

- * @license http://www.pradosoft.com/license/

- * @version $Id$

- * @package System.Web.UI.ActiveControls

- */

-

-/*

- * Load common active control options.

- */

-Prado::using('System.Web.UI.ActiveControls.TBaseActiveControl');

-

-/**

- * TActiveControlAdapter class.

- *

- * Customize the parent TControl class for active control classes.

- * TActiveControlAdapter instantiates a common base active control class

- * throught the {@link getBaseActiveControl BaseActiveControl} property.

- * The type of BaseActiveControl can be provided in the second parameter in the

- * constructor. Default is TBaseActiveControl or TBaseActiveCallbackControl if

- * the control adapted implements ICallbackEventHandler.

- *

- * TActiveControlAdapter will tracking viewstate changes to update the

- * corresponding client-side properties.

- *

- * @author Wei Zhuo <weizhuo[at]gmail[dot]com>

- * @version $Id$

- * @package System.Web.UI.ActiveControls

- * @since 3.1

- */

-class TActiveControlAdapter extends TControlAdapter

-{

-	/**

-	 * @var string base active control class name.

-	 */

-	private $_activeControlType;

-	/**

-	 * @var TBaseActiveControl base active control instance.

-	 */

-	private $_baseActiveControl;

-	/**

-	 * @var TCallbackPageStateTracker view state tracker.

-	 */

-	private $_stateTracker;

-

-	/**

-	 * Constructor.

-	 * @param IActiveControl active control to adapt.

-	 * @param string Base active control class name.

-	 */

-	public function __construct(IActiveControl $control, $baseCallbackClass=null)

-	{

-		parent::__construct($control);

-		$this->setBaseControlClass($baseCallbackClass);

-	}

-

-	/**

-	 * @param string base active control instance

-	 */

-	protected function setBaseControlClass($type)

-	{

-		if($type===null)

-		{

-			if($this->getControl() instanceof ICallbackEventHandler)

-				$this->_activeControlType = 'TBaseActiveCallbackControl';

-			else

-				$this->_activeControlType = 'TBaseActiveControl';

-		}

-		else

-			$this->_activeControlType = $type;

-	}

-

- 	/**

-	 * Publish the ajax script

-	 */

-	public function onPreRender($param)

-	{

-		parent::onPreRender($param);

-	}

-

-	/**

-	 * Renders the callback client scripts.

-	 */

-	public function render($writer)

-	{

-		$this->getPage()->getClientScript()->registerPradoScript('ajax');

-		$this->renderCallbackClientScripts();

-		if($this->_control->getVisible(false))

-		{

-			parent::render($writer);

-		} else {

-			$writer->write("<span id=\"".$this->_control->getClientID()."\" style=\"display:none\"></span>");

-		}

-	}

-

-	/**

-	 * Register the callback clientscripts and sets the post loader IDs.

-	 */

-	protected function renderCallbackClientScripts()

-	{

-		$cs = $this->getPage()->getClientScript();

-		$key = 'Prado.CallbackRequest.addPostLoaders';

-		if(!$cs->isEndScriptRegistered($key))

-		{

-			$data = $this->getPage()->getPostDataLoaders();

-			if(count($data) > 0)

-			{

-				$options = TJavaScript::encode($data,false);

-				$script = "Prado.CallbackRequest.addPostLoaders({$options});";

-				$cs->registerEndScript($key, $script);

-			}

-		}

-	}

-

-	/**

-	 * @param TBaseActiveControl change base active control

-	 */

-	public function setBaseActiveControl($control)

-	{

-		$this->_baseActiveControl=$control;

-	}

-

-	/**

-	 * @return TBaseActiveControl Common active control options.

-	 */

-	public function getBaseActiveControl()

-	{

-		if($this->_baseActiveControl===null)

-		{

-			$type = $this->_activeControlType;

-			$this->_baseActiveControl = new $type($this->getControl());

-		}

-		return $this->_baseActiveControl;

-	}

-

-	/**

-	 * @return boolean true if the viewstate needs to be tracked.

-	 */

-	protected function getIsTrackingPageState()

-	{

-		if($this->getPage()->getIsCallback())

-		{

-			$target = $this->getPage()->getCallbackEventTarget();

-			if($target instanceof ICallbackEventHandler)

-			{

-				$client = $target->getActiveControl()->getClientSide();

-				return $client->getEnablePageStateUpdate();

-			}

-		}

-		return false;

-	}

-

-	/**

-	 * Starts viewstate tracking if necessary after when controls has been loaded

-	 */

-	public function onLoad($param)

-	{

-		if($this->getIsTrackingPageState())

-		{

-			$this->_stateTracker = new TCallbackPageStateTracker($this->getControl());

-			$this->_stateTracker->trackChanges();

-		}

-		parent::onLoad($param);

-	}

-

-	/**

-	 * Saves additional persistent control state. Respond to viewstate changes

-	 * if necessary.

-	 */

-	public function saveState()

-	{

-		if(($this->_stateTracker!==null)

-			&& $this->getControl()->getActiveControl()->canUpdateClientSide(true))

-		{

-			$this->_stateTracker->respondToChanges();

-		}

-		parent::saveState();

-	}

-

-	/**

-	 * @return TCallbackPageStateTracker state tracker.

-	 */

-	public function getStateTracker()

-	{

-		return $this->_stateTracker;

-	}

-}

-

-/**

- * TCallbackPageStateTracker class.

- *

- * Tracking changes to the page state during callback.

- *

- * @author Wei Zhuo <weizhuo[at]gmail[dot]com>

- * @version $Id$

- * @package System.Web.UI.ActiveControls

- * @since 3.1

- */

-class TCallbackPageStateTracker

-{

-	/**

-	 * @var TMap new view state data

-	 */

-	private $_states;

-	/**

-	 * @var TMap old view state data

-	 */

-	private $_existingState;

-	/**

-	 * @var TControl the control tracked

-	 */

-	private $_control;

-	/**

-	 * @var object null object.

-	 */

-	private $_nullObject;

-

-	/**

-	 * Constructor. Add a set of default states to track.

-	 * @param TControl control to track.

-	 */

-	public function __construct($control)

-	{

-		$this->_control = $control;

-		$this->_existingState = new TMap;

-		$this->_nullObject = new stdClass;

-		$this->_states = new TMap;

-		$this->addStatesToTrack();

-	}

-

-	/**

-	 * Add a list of view states to track. Each state is added

-	 * to the StatesToTrack property with the view state name as key.

-	 * The value should be an array with two enteries. The first entery

-	 * is the name of the class that will calculate the state differences.

-	 * The second entry is a php function/method callback that handles

-	 * the changes in the viewstate.

-	 */

-	protected function addStatesToTrack()

-	{

-		$states = $this->getStatesToTrack();

-		$states['Visible'] = array('TScalarDiff', array($this, 'updateVisible'));

-		$states['Enabled'] = array('TScalarDiff', array($this, 'updateEnabled'));

-		$states['Attributes'] = array('TMapCollectionDiff', array($this, 'updateAttributes'));

-		$states['Style'] = array('TStyleDiff', array($this, 'updateStyle'));

-		$states['TabIndex'] = array('TScalarDiff', array($this, 'updateTabIndex'));

-		$states['ToolTip'] = array('TScalarDiff', array($this, 'updateToolTip'));

-		$states['AccessKey'] = array('TScalarDiff', array($this, 'updateAccessKey'));

-	}

-

-	/**

-	 * @return TMap list of viewstates to track.

-	 */

-	protected function getStatesToTrack()

-	{

-		return $this->_states;

-	}

-

-	/**

-	 * Start tracking view state changes. The clone function on objects are called

-	 * for those viewstate having an object as value.

-	 */

-	public function trackChanges()

-	{

-		foreach($this->_states as $name => $value)

-		{

-			$obj = $this->_control->getViewState($name);

-			$this->_existingState[$name] = is_object($obj) ? clone($obj) : $obj;

-		}

-	}

-

-	/**

-	 * @return array list of viewstate and the changed data.

-	 */

-	protected function getChanges()

-	{

-		$changes = array();

-		foreach($this->_states as $name => $details)

-		{

-			$new = $this->_control->getViewState($name);

-			$old = $this->_existingState[$name];

-			if($new !== $old)

-			{

-				$diff = new $details[0]($new, $old, $this->_nullObject);

-				if(($change = $diff->getDifference()) !== $this->_nullObject)

-					$changes[] = array($details[1],array($change));

-			}

-		}

-		return $changes;

-	}

-

-	/**

-	 * For each of the changes call the corresponding change handlers.

-	 */

-	public function respondToChanges()

-	{

-		foreach($this->getChanges() as $change)

-			call_user_func_array($change[0], $change[1]);

-	}

-

-	/**

-	 * @return TCallbackClientScript callback client scripting

-	 */

-	protected function client()

-	{

-		return $this->_control->getPage()->getCallbackClient();

-	}

-

-	/**

-	 * Updates the tooltip.

-	 * @param string new tooltip

-	 */

-	protected function updateToolTip($value)

-	{

-		$this->client()->setAttribute($this->_control, 'title', $value);

-	}

-

-	/**

-	 * Updates the tab index.

-	 * @param integer tab index

-	 */

-	protected function updateTabIndex($value)

-	{

-		$this->client()->setAttribute($this->_control, 'tabindex', $value);

-	}

-

-	/**

-	 * Updates the modifier access key

-	 * @param string access key

-	 */

-	protected function updateAccessKey($value)

-	{

-		$this->client()->setAttribute($this->_control, 'accesskey', $value);

-	}

-

-	/**

-	 * Hides or shows the control on the client-side. The control must be

-	 * already rendered on the client-side.

-	 * @param boolean true to show the control, false to hide.

-	 */

-	protected function updateVisible($visible)

-	{

-		if($visible === false)

-			$this->client()->replaceContent($this->_control,"<span id=\"".$this->_control->getClientID()."\" style=\"display:none\" ></span>");

-		else

-			$this->client()->replaceContent($this->_control,$this->_control);

-	}

-

-	/**

-	 * Enables or Disables the control on the client-side.

-	 * @param boolean true to enable the control, false to disable.

-	 */

-	protected function updateEnabled($enable)

-	{

-		$this->client()->setAttribute($this->_control, 'disabled', $enable===false);

-	}

-

-	/**

-	 * Updates the CSS style on the control on the client-side.

-	 * @param array list of new CSS style declarations.

-	 */

-	protected function updateStyle($style)

-	{

-		if($style['CssClass']!==null)

-			$this->client()->setAttribute($this->_control, 'class', $style['CssClass']);

-		if(count($style['Style']) > 0)

-			$this->client()->setStyle($this->_control, $style['Style']);

-	}

-

-	/**

-	 * Updates/adds a list of attributes on the control.

-	 * @param array list of attribute name-value pairs.

-	 */

-	protected function updateAttributes($attributes)

-	{

-		foreach($attributes as $name => $value)

-			$this->client()->setAttribute($this->_control, $name, $value);

-	}

-}

-

-/**

- * Calculates the viewstate changes during the request.

- *

- * @author Wei Zhuo <weizhuo[at]gmail[dot]com>

- * @version $Id$

- * @package System.Web.UI.ActiveControls

- * @since 3.1

- */

-abstract class TViewStateDiff

-{

-	/**

-	 * @var mixed updated viewstate

-	 */

-	protected $_new;

-	/**

-	 * @var mixed viewstate value at the begining of the request.

-	 */

-	protected $_old;

-	/**

-	 * @var object null value.

-	 */

-	protected $_null;

-

-	/**

-	 * Constructor.

-	 * @param mixed updated viewstate value.

-	 * @param mixed viewstate value at the begining of the request.

-	 * @param object representing the null value.

-	 */

-	public function __construct($new, $old, $null)

-	{

-		$this->_new = $new;

-		$this->_old = $old;

-		$this->_null = $null;

-	}

-

-	/**

-	 * @return mixed view state changes, nullObject if no difference.

-	 */

-	public abstract function getDifference();

-}

-

-/**

- * TScalarDiff class.

- *

- * Calculate the changes to a scalar value.

- *

- * @author Wei Zhuo <weizhuo[at]gmail[dot]com>

- * @version $Id$

- * @package System.Web.UI.ActiveControls

- * @since 3.1

- */

-class TScalarDiff extends TViewStateDiff

-{

-	/**

-	 * @return mixed update viewstate value.

-	 */

-	public function getDifference()

-	{

-		if(gettype($this->_new) === gettype($this->_old)

-			&& $this->_new === $this->_old)

-			return $this->_null;

-		else

-			return $this->_new;

-	}

-}

-

-/**

- * TStyleDiff class.

- *

- * Calculates the changes to the Style properties.

- *

- * @author Wei Zhuo <weizhuo[at]gmail[dot]com>

- * @version $Id$

- * @package System.Web.UI.ActiveControls

- * @since 3.1

- */

-class TStyleDiff extends TViewStateDiff

-{

-	/**

-	 * @param TStyle control style

-	 * @return array all the style properties combined.

-	 */

-	protected function getCombinedStyle($obj)

-	{

-		if(!($obj instanceof TStyle))

-			return array();

-		$style = $obj->getStyleFields();

-		$style = array_merge($style,$this->getStyleFromString($obj->getCustomStyle()));

-		if($obj->hasFont())

-			$style = array_merge($style, $this->getStyleFromString($obj->getFont()->toString()));

-		return $style;

-	}

-

-	/**

-	 * @param string CSS custom style string.

-	 * @param array CSS style as name-value array.

-	 */

-	protected function getStyleFromString($string)

-	{

-		$style = array();

-		if(!is_string($string)) return $style;

-

-		foreach(explode(';',$string) as $sub)

-		{

-			$arr=explode(':',$sub);

-			if(isset($arr[1]) && trim($arr[0])!=='')

-				$style[trim($arr[0])] = trim($arr[1]);

-		}

-		return $style;

-	}

-

-	/**

-	 * @return string changes to the CSS class name.

-	 */

-	protected function getCssClassDiff()

-	{

-		if($this->_old===null)

-		{

-			return ($this->_new!==null) && $this->_new->hasCssClass()

-						? $this->_new->getCssClass() : null;

-		}

-		else

-		{

-			return $this->_old->getCssClass() !== $this->_new->getCssClass() ?

-				$this->_new->getCssClass() : null;

-		}

-	}

-

-	/**

-	 * @return array list of changes to the control style.

-	 */

-	protected function getStyleDiff()

-	{

-		$diff = array_diff_assoc(

-					$this->getCombinedStyle($this->_new),

-					$this->getCombinedStyle($this->_old));

-		return count($diff) > 0 ? $diff : null;

-	}

-

-	/**

-	 * @return array list of changes to the control style and CSS class name.

-	 */

-	public function getDifference()

-	{

-		if($this->_new===null)

-			return $this->_null;

-		else

-		{

-			$css = $this->getCssClassDiff();

-			$style = $this->getStyleDiff();

-			if(($css!==null) || ($style!==null))

-				return array('CssClass' => $css, 'Style' => $style);

-			else

-				$this->_null;

-		}

-	}

-}

-

-/**

- * TAttributesDiff class.

- *

- * Calculate the changes to attributes collection.

- *

- * @author Wei Zhuo <weizhuo[at]gmail[dot]com>

- * @version $Id$

- * @package System.Web.UI.ActiveControls

- * @since 3.1

- */

-class TMapCollectionDiff extends TViewStateDiff

-{

-	/**

-	 * @return array updates to the attributes collection.

-	 */

-	public function getDifference()

-	{

-		if($this->_old===null)

-		{

-			return ($this->_new!==null) ? $this->_new->toArray() : $this->_null;

-		}

-		else

-		{

-			$new = $this->_new->toArray();

-			$old = $this->_old->toArray();

-			$diff = array_diff_assoc($new, $old);

-			return count($diff) > 0 ? $diff : $this->_null;

-		}

-	}

-}

-

+<?php
+/**
+ * TActiveControlAdapter and TCallbackPageStateTracker class file.
+ *
+ * @author Wei Zhuo <weizhuo[at]gamil[dot]com>
+ * @link http://www.pradosoft.com/
+ * @copyright Copyright &copy; 2005-2012 PradoSoft
+ * @license http://www.pradosoft.com/license/
+ * @version $Id$
+ * @package System.Web.UI.ActiveControls
+ */
+
+/*
+ * Load common active control options.
+ */
+Prado::using('System.Web.UI.ActiveControls.TBaseActiveControl');
+
+/**
+ * TActiveControlAdapter class.
+ *
+ * Customize the parent TControl class for active control classes.
+ * TActiveControlAdapter instantiates a common base active control class
+ * throught the {@link getBaseActiveControl BaseActiveControl} property.
+ * The type of BaseActiveControl can be provided in the second parameter in the
+ * constructor. Default is TBaseActiveControl or TBaseActiveCallbackControl if
+ * the control adapted implements ICallbackEventHandler.
+ *
+ * TActiveControlAdapter will tracking viewstate changes to update the
+ * corresponding client-side properties.
+ *
+ * @author Wei Zhuo <weizhuo[at]gmail[dot]com>
+ * @version $Id$
+ * @package System.Web.UI.ActiveControls
+ * @since 3.1
+ */
+class TActiveControlAdapter extends TControlAdapter
+{
+	/**
+	 * @var string base active control class name.
+	 */
+	private $_activeControlType;
+	/**
+	 * @var TBaseActiveControl base active control instance.
+	 */
+	private $_baseActiveControl;
+	/**
+	 * @var TCallbackPageStateTracker view state tracker.
+	 */
+	private $_stateTracker;
+
+	/**
+	 * Constructor.
+	 * @param IActiveControl active control to adapt.
+	 * @param string Base active control class name.
+	 */
+	public function __construct(IActiveControl $control, $baseCallbackClass=null)
+	{
+		parent::__construct($control);
+		$this->setBaseControlClass($baseCallbackClass);
+	}
+
+	/**
+	 * @param string base active control instance
+	 */
+	protected function setBaseControlClass($type)
+	{
+		if($type===null)
+		{
+			if($this->getControl() instanceof ICallbackEventHandler)
+				$this->_activeControlType = 'TBaseActiveCallbackControl';
+			else
+				$this->_activeControlType = 'TBaseActiveControl';
+		}
+		else
+			$this->_activeControlType = $type;
+	}
+
+ 	/**
+	 * Publish the ajax script
+	 */
+	public function onPreRender($param)
+	{
+		parent::onPreRender($param);
+	}
+
+	/**
+	 * Renders the callback client scripts.
+	 */
+	public function render($writer)
+	{
+		$this->getPage()->getClientScript()->registerPradoScript('ajax');
+		$this->renderCallbackClientScripts();
+		if($this->_control->getVisible(false))
+		{
+			parent::render($writer);
+		} else {
+			$writer->write("<span id=\"".$this->_control->getClientID()."\" style=\"display:none\"></span>");
+		}
+	}
+
+	/**
+	 * Register the callback clientscripts and sets the post loader IDs.
+	 */
+	protected function renderCallbackClientScripts()
+	{
+		$cs = $this->getPage()->getClientScript();
+		$key = 'Prado.CallbackRequest.addPostLoaders';
+		if(!$cs->isEndScriptRegistered($key))
+		{
+			$data = $this->getPage()->getPostDataLoaders();
+			if(count($data) > 0)
+			{
+				$options = TJavaScript::encode($data,false);
+				$script = "Prado.CallbackRequest.addPostLoaders({$options});";
+				$cs->registerEndScript($key, $script);
+			}
+		}
+	}
+
+	/**
+	 * @param TBaseActiveControl change base active control
+	 */
+	public function setBaseActiveControl($control)
+	{
+		$this->_baseActiveControl=$control;
+	}
+
+	/**
+	 * @return TBaseActiveControl Common active control options.
+	 */
+	public function getBaseActiveControl()
+	{
+		if($this->_baseActiveControl===null)
+		{
+			$type = $this->_activeControlType;
+			$this->_baseActiveControl = new $type($this->getControl());
+		}
+		return $this->_baseActiveControl;
+	}
+
+	/**
+	 * @return boolean true if the viewstate needs to be tracked.
+	 */
+	protected function getIsTrackingPageState()
+	{
+		if($this->getPage()->getIsCallback())
+		{
+			$target = $this->getPage()->getCallbackEventTarget();
+			if($target instanceof ICallbackEventHandler)
+			{
+				$client = $target->getActiveControl()->getClientSide();
+				return $client->getEnablePageStateUpdate();
+			}
+		}
+		return false;
+	}
+
+	/**
+	 * Starts viewstate tracking if necessary after when controls has been loaded
+	 */
+	public function onLoad($param)
+	{
+		if($this->getIsTrackingPageState())
+		{
+			$this->_stateTracker = new TCallbackPageStateTracker($this->getControl());
+			$this->_stateTracker->trackChanges();
+		}
+		parent::onLoad($param);
+	}
+
+	/**
+	 * Saves additional persistent control state. Respond to viewstate changes
+	 * if necessary.
+	 */
+	public function saveState()
+	{
+		if(($this->_stateTracker!==null)
+			&& $this->getControl()->getActiveControl()->canUpdateClientSide(true))
+		{
+			$this->_stateTracker->respondToChanges();
+		}
+		parent::saveState();
+	}
+
+	/**
+	 * @return TCallbackPageStateTracker state tracker.
+	 */
+	public function getStateTracker()
+	{
+		return $this->_stateTracker;
+	}
+}
+
+/**
+ * TCallbackPageStateTracker class.
+ *
+ * Tracking changes to the page state during callback.
+ *
+ * @author Wei Zhuo <weizhuo[at]gmail[dot]com>
+ * @version $Id$
+ * @package System.Web.UI.ActiveControls
+ * @since 3.1
+ */
+class TCallbackPageStateTracker
+{
+	/**
+	 * @var TMap new view state data
+	 */
+	private $_states;
+	/**
+	 * @var TMap old view state data
+	 */
+	private $_existingState;
+	/**
+	 * @var TControl the control tracked
+	 */
+	private $_control;
+	/**
+	 * @var object null object.
+	 */
+	private $_nullObject;
+
+	/**
+	 * Constructor. Add a set of default states to track.
+	 * @param TControl control to track.
+	 */
+	public function __construct($control)
+	{
+		$this->_control = $control;
+		$this->_existingState = new TMap;
+		$this->_nullObject = new stdClass;
+		$this->_states = new TMap;
+		$this->addStatesToTrack();
+	}
+
+	/**
+	 * Add a list of view states to track. Each state is added
+	 * to the StatesToTrack property with the view state name as key.
+	 * The value should be an array with two enteries. The first entery
+	 * is the name of the class that will calculate the state differences.
+	 * The second entry is a php function/method callback that handles
+	 * the changes in the viewstate.
+	 */
+	protected function addStatesToTrack()
+	{
+		$states = $this->getStatesToTrack();
+		$states['Visible'] = array('TScalarDiff', array($this, 'updateVisible'));
+		$states['Enabled'] = array('TScalarDiff', array($this, 'updateEnabled'));
+		$states['Attributes'] = array('TMapCollectionDiff', array($this, 'updateAttributes'));
+		$states['Style'] = array('TStyleDiff', array($this, 'updateStyle'));
+		$states['TabIndex'] = array('TScalarDiff', array($this, 'updateTabIndex'));
+		$states['ToolTip'] = array('TScalarDiff', array($this, 'updateToolTip'));
+		$states['AccessKey'] = array('TScalarDiff', array($this, 'updateAccessKey'));
+	}
+
+	/**
+	 * @return TMap list of viewstates to track.
+	 */
+	protected function getStatesToTrack()
+	{
+		return $this->_states;
+	}
+
+	/**
+	 * Start tracking view state changes. The clone function on objects are called
+	 * for those viewstate having an object as value.
+	 */
+	public function trackChanges()
+	{
+		foreach($this->_states as $name => $value)
+		{
+			$obj = $this->_control->getViewState($name);
+			$this->_existingState[$name] = is_object($obj) ? clone($obj) : $obj;
+		}
+	}
+
+	/**
+	 * @return array list of viewstate and the changed data.
+	 */
+	protected function getChanges()
+	{
+		$changes = array();
+		foreach($this->_states as $name => $details)
+		{
+			$new = $this->_control->getViewState($name);
+			$old = $this->_existingState[$name];
+			if($new !== $old)
+			{
+				$diff = new $details[0]($new, $old, $this->_nullObject);
+				if(($change = $diff->getDifference()) !== $this->_nullObject)
+					$changes[] = array($details[1],array($change));
+			}
+		}
+		return $changes;
+	}
+
+	/**
+	 * For each of the changes call the corresponding change handlers.
+	 */
+	public function respondToChanges()
+	{
+		foreach($this->getChanges() as $change)
+			call_user_func_array($change[0], $change[1]);
+	}
+
+	/**
+	 * @return TCallbackClientScript callback client scripting
+	 */
+	protected function client()
+	{
+		return $this->_control->getPage()->getCallbackClient();
+	}
+
+	/**
+	 * Updates the tooltip.
+	 * @param string new tooltip
+	 */
+	protected function updateToolTip($value)
+	{
+		$this->client()->setAttribute($this->_control, 'title', $value);
+	}
+
+	/**
+	 * Updates the tab index.
+	 * @param integer tab index
+	 */
+	protected function updateTabIndex($value)
+	{
+		$this->client()->setAttribute($this->_control, 'tabindex', $value);
+	}
+
+	/**
+	 * Updates the modifier access key
+	 * @param string access key
+	 */
+	protected function updateAccessKey($value)
+	{
+		$this->client()->setAttribute($this->_control, 'accesskey', $value);
+	}
+
+	/**
+	 * Hides or shows the control on the client-side. The control must be
+	 * already rendered on the client-side.
+	 * @param boolean true to show the control, false to hide.
+	 */
+	protected function updateVisible($visible)
+	{
+		if($visible === false)
+			$this->client()->replaceContent($this->_control,"<span id=\"".$this->_control->getClientID()."\" style=\"display:none\" ></span>");
+		else
+			$this->client()->replaceContent($this->_control,$this->_control);
+	}
+
+	/**
+	 * Enables or Disables the control on the client-side.
+	 * @param boolean true to enable the control, false to disable.
+	 */
+	protected function updateEnabled($enable)
+	{
+		$this->client()->setAttribute($this->_control, 'disabled', $enable===false);
+	}
+
+	/**
+	 * Updates the CSS style on the control on the client-side.
+	 * @param array list of new CSS style declarations.
+	 */
+	protected function updateStyle($style)
+	{
+		if($style['CssClass']!==null)
+			$this->client()->setAttribute($this->_control, 'class', $style['CssClass']);
+		if(count($style['Style']) > 0)
+			$this->client()->setStyle($this->_control, $style['Style']);
+	}
+
+	/**
+	 * Updates/adds a list of attributes on the control.
+	 * @param array list of attribute name-value pairs.
+	 */
+	protected function updateAttributes($attributes)
+	{
+		foreach($attributes as $name => $value)
+			$this->client()->setAttribute($this->_control, $name, $value);
+	}
+}
+
+/**
+ * Calculates the viewstate changes during the request.
+ *
+ * @author Wei Zhuo <weizhuo[at]gmail[dot]com>
+ * @version $Id$
+ * @package System.Web.UI.ActiveControls
+ * @since 3.1
+ */
+abstract class TViewStateDiff
+{
+	/**
+	 * @var mixed updated viewstate
+	 */
+	protected $_new;
+	/**
+	 * @var mixed viewstate value at the begining of the request.
+	 */
+	protected $_old;
+	/**
+	 * @var object null value.
+	 */
+	protected $_null;
+
+	/**
+	 * Constructor.
+	 * @param mixed updated viewstate value.
+	 * @param mixed viewstate value at the begining of the request.
+	 * @param object representing the null value.
+	 */
+	public function __construct($new, $old, $null)
+	{
+		$this->_new = $new;
+		$this->_old = $old;
+		$this->_null = $null;
+	}
+
+	/**
+	 * @return mixed view state changes, nullObject if no difference.
+	 */
+	public abstract function getDifference();
+}
+
+/**
+ * TScalarDiff class.
+ *
+ * Calculate the changes to a scalar value.
+ *
+ * @author Wei Zhuo <weizhuo[at]gmail[dot]com>
+ * @version $Id$
+ * @package System.Web.UI.ActiveControls
+ * @since 3.1
+ */
+class TScalarDiff extends TViewStateDiff
+{
+	/**
+	 * @return mixed update viewstate value.
+	 */
+	public function getDifference()
+	{
+		if(gettype($this->_new) === gettype($this->_old)
+			&& $this->_new === $this->_old)
+			return $this->_null;
+		else
+			return $this->_new;
+	}
+}
+
+/**
+ * TStyleDiff class.
+ *
+ * Calculates the changes to the Style properties.
+ *
+ * @author Wei Zhuo <weizhuo[at]gmail[dot]com>
+ * @version $Id$
+ * @package System.Web.UI.ActiveControls
+ * @since 3.1
+ */
+class TStyleDiff extends TViewStateDiff
+{
+	/**
+	 * @param TStyle control style
+	 * @return array all the style properties combined.
+	 */
+	protected function getCombinedStyle($obj)
+	{
+		if(!($obj instanceof TStyle))
+			return array();
+		$style = $obj->getStyleFields();
+		$style = array_merge($style,$this->getStyleFromString($obj->getCustomStyle()));
+		if($obj->hasFont())
+			$style = array_merge($style, $this->getStyleFromString($obj->getFont()->toString()));
+		return $style;
+	}
+
+	/**
+	 * @param string CSS custom style string.
+	 * @param array CSS style as name-value array.
+	 */
+	protected function getStyleFromString($string)
+	{
+		$style = array();
+		if(!is_string($string)) return $style;
+
+		foreach(explode(';',$string) as $sub)
+		{
+			$arr=explode(':',$sub);
+			if(isset($arr[1]) && trim($arr[0])!=='')
+				$style[trim($arr[0])] = trim($arr[1]);
+		}
+		return $style;
+	}
+
+	/**
+	 * @return string changes to the CSS class name.
+	 */
+	protected function getCssClassDiff()
+	{
+		if($this->_old===null)
+		{
+			return ($this->_new!==null) && $this->_new->hasCssClass()
+						? $this->_new->getCssClass() : null;
+		}
+		else
+		{
+			return $this->_old->getCssClass() !== $this->_new->getCssClass() ?
+				$this->_new->getCssClass() : null;
+		}
+	}
+
+	/**
+	 * @return array list of changes to the control style.
+	 */
+	protected function getStyleDiff()
+	{
+		$diff = array_diff_assoc(
+					$this->getCombinedStyle($this->_new),
+					$this->getCombinedStyle($this->_old));
+		return count($diff) > 0 ? $diff : null;
+	}
+
+	/**
+	 * @return array list of changes to the control style and CSS class name.
+	 */
+	public function getDifference()
+	{
+		if($this->_new===null)
+			return $this->_null;
+		else
+		{
+			$css = $this->getCssClassDiff();
+			$style = $this->getStyleDiff();
+			if(($css!==null) || ($style!==null))
+				return array('CssClass' => $css, 'Style' => $style);
+			else
+				$this->_null;
+		}
+	}
+}
+
+/**
+ * TAttributesDiff class.
+ *
+ * Calculate the changes to attributes collection.
+ *
+ * @author Wei Zhuo <weizhuo[at]gmail[dot]com>
+ * @version $Id$
+ * @package System.Web.UI.ActiveControls
+ * @since 3.1
+ */
+class TMapCollectionDiff extends TViewStateDiff
+{
+	/**
+	 * @return array updates to the attributes collection.
+	 */
+	public function getDifference()
+	{
+		if($this->_old===null)
+		{
+			return ($this->_new!==null) ? $this->_new->toArray() : $this->_null;
+		}
+		else
+		{
+			$new = $this->_new->toArray();
+			$old = $this->_old->toArray();
+			$diff = array_diff_assoc($new, $old);
+			return count($diff) > 0 ? $diff : $this->_null;
+		}
+	}
+}
+