Subversion-Projekte lars-tiefland.prado

<?php
/**
 * TActiveDropDownList class file.
 *
 * @author Wei Zhuo <weizhuo[at]gamil[dot]com>
 * @link http://www.pradosoft.com/
 * @copyright Copyright &copy; 2005-2008 PradoSoft
 * @license http://www.pradosoft.com/license/
 * @version $Id: TActiveDropDownList.php 2600 2009-01-07 12:58:53Z christophe.boulain $
 * @package System.Web.UI.ActiveControls
 */

/**
 * Load active list control adapter
 */
Prado::using('System.Web.UI.ActiveControls.TActiveListControlAdapter');

/**
 * TActiveDropDownList class.
 *
 * The active control counter part to drop down list control.
 * The {@link setAutoPostBack AutoPostBack} property is set to true by default.
 * Thus, when the drop down list selection is changed the {@link onCallback OnCallback} event is
 * raised after {@link OnSelectedIndexChanged} event.
 *
 * With {@link TBaseActiveControl::setEnableUpdate() ActiveControl.EnabledUpdate}
 * set to true (default is true), changes to the selection, <b>after</b> OnLoad event has
 * been raised, will be updated.
 * on the client side.
 *
 * List items can be changed dynamically during a callback request.
 *
 * @author Wei Zhuo <weizhuo[at]gmail[dot]com>
 * @version $Id: TActiveDropDownList.php 2600 2009-01-07 12:58:53Z christophe.boulain $
 * @package System.Web.UI.ActiveControls
 * @since 3.1
 */
class TActiveDropDownList extends TDropDownList implements ICallbackEventHandler, IActiveControl
{
        /**
         * Creates a new callback control, sets the adapter to
         * TActiveListControlAdapter. If you override this class, be sure to set the
         * adapter appropriately by, for example, by calling this constructor.
         */
        public function __construct()
        {
                parent::__construct();
                $this->setAdapter(new TActiveListControlAdapter($this));
                $this->setAutoPostBack(true);
        }

        /**
         * @return TBaseActiveCallbackControl standard callback control options.
         */
        public function getActiveControl()
        {
                return $this->getAdapter()->getBaseActiveControl();
        }

        /**
         * @return TCallbackClientSide client side request options.
         */
        public function getClientSide()
        {
                return $this->getAdapter()->getBaseActiveControl()->getClientSide();
        }

        /**
         * No client class for this control.
         * This method overrides the parent implementation.
         * @return null no javascript class name.
         */
        protected function getClientClassName()
        {
                return 'Prado.WebUI.TActiveDropDownList';
        }

        /**
         * Creates a collection object to hold list items. A specialized
         * TActiveListItemCollection is created to allow the drop down list options
         * to be added.
         * This method may be overriden to create a customized collection.
         * @return TActiveListItemCollection the collection object
         */
        protected function createListItemCollection()
        {
                $collection  = new TActiveListItemCollection;
                $collection->setControl($this);
                return $collection;
        }

        /**
         * Override parent implementation, no javascript is rendered here instead
         * the javascript required for active control is registered in {@link addAttributesToRender}.
         */
        protected function renderClientControlScript($writer)
        {
        }

        /**
         * Ensure that the ID attribute is rendered and registers the javascript code
         * for initializing the active control.
         */
        protected function addAttributesToRender($writer)
        {
                parent::addAttributesToRender($writer);
                $writer->addAttribute('id',$this->getClientID());
                if ($this->getAutoPostBack())
                        $this->getActiveControl()->registerCallbackClientScript(
                                $this->getClientClassName(), $this->getPostBackOptions());
        }

        /**
         * Raises the callback event. This method is required by {@link
         * ICallbackEventHandler} interface.
         * This method is mainly used by framework and control developers.
         * @param TCallbackEventParameter the event parameter
         */
        public function raiseCallbackEvent($param)
        {
                $this->onCallback($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);
        }

        /**
         * Updates the client-side options if the item list has changed after the OnLoad event.
         */
        public function onPreRender($param)
        {
                parent::onPreRender($param);
                $this->getAdapter()->updateListItems();
        }
}

?>