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;
+		}
+	}
+}
+