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<?php
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/**
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* TActiveDropDownList class file.
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*
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* @author Wei Zhuo <weizhuo[at]gamil[dot]com>
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* @link http://www.pradosoft.com/
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* @copyright Copyright © 2005-2008 PradoSoft
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* @license http://www.pradosoft.com/license/
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* @version $Id: TActiveDropDownList.php 2600 2009-01-07 12:58:53Z christophe.boulain $
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* @package System.Web.UI.ActiveControls
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*/
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/**
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* Load active list control adapter
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*/
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Prado::using('System.Web.UI.ActiveControls.TActiveListControlAdapter');
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/**
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* TActiveDropDownList class.
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*
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* The active control counter part to drop down list control.
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* The {@link setAutoPostBack AutoPostBack} property is set to true by default.
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* Thus, when the drop down list selection is changed the {@link onCallback OnCallback} event is
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* raised after {@link OnSelectedIndexChanged} event.
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*
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* With {@link TBaseActiveControl::setEnableUpdate() ActiveControl.EnabledUpdate}
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* set to true (default is true), changes to the selection, <b>after</b> OnLoad event has
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* been raised, will be updated.
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* on the client side.
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*
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* List items can be changed dynamically during a callback request.
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*
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* @author Wei Zhuo <weizhuo[at]gmail[dot]com>
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* @version $Id: TActiveDropDownList.php 2600 2009-01-07 12:58:53Z christophe.boulain $
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* @package System.Web.UI.ActiveControls
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* @since 3.1
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*/
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class TActiveDropDownList extends TDropDownList implements ICallbackEventHandler, IActiveControl
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{
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/**
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* Creates a new callback control, sets the adapter to
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* TActiveListControlAdapter. If you override this class, be sure to set the
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* adapter appropriately by, for example, by calling this constructor.
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*/
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public function __construct()
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{
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parent::__construct();
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$this->setAdapter(new TActiveListControlAdapter($this));
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$this->setAutoPostBack(true);
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}
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/**
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* @return TBaseActiveCallbackControl standard callback control options.
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*/
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public function getActiveControl()
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{
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return $this->getAdapter()->getBaseActiveControl();
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}
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/**
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* @return TCallbackClientSide client side request options.
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*/
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public function getClientSide()
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{
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return $this->getAdapter()->getBaseActiveControl()->getClientSide();
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}
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/**
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* No client class for this control.
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* This method overrides the parent implementation.
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* @return null no javascript class name.
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*/
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protected function getClientClassName()
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{
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return 'Prado.WebUI.TActiveDropDownList';
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}
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/**
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* Creates a collection object to hold list items. A specialized
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* TActiveListItemCollection is created to allow the drop down list options
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* to be added.
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* This method may be overriden to create a customized collection.
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* @return TActiveListItemCollection the collection object
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*/
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protected function createListItemCollection()
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{
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$collection = new TActiveListItemCollection;
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$collection->setControl($this);
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return $collection;
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}
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/**
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* Override parent implementation, no javascript is rendered here instead
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* the javascript required for active control is registered in {@link addAttributesToRender}.
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*/
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protected function renderClientControlScript($writer)
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{
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}
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/**
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* Ensure that the ID attribute is rendered and registers the javascript code
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* for initializing the active control.
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*/
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protected function addAttributesToRender($writer)
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{
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parent::addAttributesToRender($writer);
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$writer->addAttribute('id',$this->getClientID());
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if ($this->getAutoPostBack())
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$this->getActiveControl()->registerCallbackClientScript(
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$this->getClientClassName(), $this->getPostBackOptions());
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}
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/**
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* Raises the callback event. This method is required by {@link
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* ICallbackEventHandler} interface.
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* This method is mainly used by framework and control developers.
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* @param TCallbackEventParameter the event parameter
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*/
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public function raiseCallbackEvent($param)
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{
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$this->onCallback($param);
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}
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/**
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* This method is invoked when a callback is requested. The method raises
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* 'OnCallback' event to fire up the event handlers. If you override this
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* method, be sure to call the parent implementation so that the event
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* handler can be invoked.
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* @param TCallbackEventParameter event parameter to be passed to the event handlers
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*/
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public function onCallback($param)
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{
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$this->raiseEvent('OnCallback', $this, $param);
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}
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/**
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* Updates the client-side options if the item list has changed after the OnLoad event.
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*/
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public function onPreRender($param)
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{
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parent::onPreRender($param);
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$this->getAdapter()->updateListItems();
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}
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}
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?>
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