<?php
/**
 * TCallback class file.
 *
 * @author Wei Zhuo <weizhuo[at]gmail[dot]com>
 * @link http://www.pradosoft.com/
 * @copyright Copyright &copy; 2005 PradoSoft
 * @license http://www.pradosoft.com/license/
 * @version $Revision: $  $Date: $
 * @package System.Web.UI.ActiveControls
 */

/**
 * TCallback component class.
 *
 * The TCallback provides a basic callback handler that can be invoke from the
 * client side by running the javascript code obtained from the
 * {@link getCallbackReference CallbackReference} property. The event {@link
 * onCallback OnCallback} is raise when a callback is requested by the TCallback
 * component.
 *
 * @author Wei Zhuo <weizhuo[at]gmail[dot]com>
 * @version $Revision: $  $Date: $
 * @package System.Web.UI.ActiveControls
 * @since 3.0
 */
class TCallback extends TControl implements ICallbackEventHandler
{	
	/**
	 * Creates a new callback control, sets the adapter to
	 * TActiveControlAdapter. If you override this class, be sure to set the
	 * adapter appropriately by, for example, call this constructor.
	 */
	public function __construct()
	{
		parent::__construct();
		$this->setAdapter(new TActiveControlAdapter($this));
	}

	/**
	 * @return TBaseActiveCallbackControl base callback options.
	 */
	public function getActiveControl()
	{
		return $this->getAdapter()->getActiveControl();
	}
	
	/**
	 * Raises the callback event. This method is required by {@link
	 * ICallbackEventHandler} interface. If {@link getCausesValidation
	 * CausesValidation} is true, it will invoke the page's {@link TPage::
	 * validate validate} method first. It will raise {@link onCallback
	 * OnCallback} event. This method is mainly used by framework and control
	 * developers.
	 * @param TCallbackEventParameter the event parameter
	 */	
	public function raiseCallbackEvent($param)
	{
		if($this->getActiveControl()->canCauseValidation())
			$this->getPage()->validate($this->getActiveControl()->getValidationGroup());
		$this->onCallback($param);
	}
		
	/**
	 * This method is invoked when a callback is requested. The method raises
	 * 'OnCallback' event to fire up the event handlers. If you override this
	 * method, be sure to call the parent implementation so that the event
	 * handler can be invoked.
	 * @param TCallbackEventParameter event parameter to be passed to the event handlers
	 */		
	public function onCallback($param)
	{
		$this->raiseEvent('OnCallback', $this, $param);
	}
} 

?>