Subversion-Projekte lars-tiefland.prado

<?php
/**
 * TActiveImageButton 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: TActiveImageButton.php 2482 2008-07-30 02:07:13Z knut $
 * @package System.Web.UI.ActiveControls
 */

/**
 * TActiveImageButton class.
 *
 * TActiveImageButton is the active control counter part to TLinkButton.
 * When a TActiveImageButton is clicked, rather than a normal post back request a
 * callback request is initiated.
 *
 * The {@link onCallback OnCallback} event is raised during a callback request
 * and it is raise <b>after</b> the {@link onClick OnClick} event.
 *
 * @author Wei Zhuo <weizhuo[at]gmail[dot]com>
 * @version $Id: TActiveImageButton.php 2482 2008-07-30 02:07:13Z knut $
 * @package System.Web.UI.ActiveControls
 * @since 3.1
 */
class TActiveImageButton extends TImageButton implements IActiveControl, 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, by calling this constructor.
         */
        public function __construct()
        {
                parent::__construct();
                $this->setAdapter(new TActiveControlAdapter($this));
        }

        /**
         * @return TBaseActiveControl basic active control options.
         */
        public function getActiveControl()
        {
                return $this->getAdapter()->getBaseActiveControl();
        }

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

        /**
         * Sets the alternative text to be displayed in the TImage when the image is unavailable.
         * @param string the alternative text
         */
        public function setAlternateText($value)
        {
                parent::setAlternateText($value);
                if($this->getActiveControl()->canUpdateClientSide())
                        $this->getPage()->getCallbackClient()->setAttribute($this, 'alt', $value);
        }

        /**
         * Sets the alignment of the image with respective to other elements on the page.
         * Possible values include: absbottom, absmiddle, baseline, bottom, left,
         * middle, right, texttop, and top. If an empty string is passed in,
         * imagealign attribute will not be rendered.
         * @param string the alignment of the image
         */
        public function setImageAlign($value)
        {
                parent::setImageAlign($value);
                if($this->getActiveControl()->canUpdateClientSide())
                        $this->getPage()->getCallbackClient()->setAttribute($this, 'align', $value);
        }

        /**
         * @param string the URL of the image file
         */
        public function setImageUrl($value)
        {
                parent::setImageUrl($value);
                if($this->getActiveControl()->canUpdateClientSide())
                        $this->getPage()->getCallbackClient()->setAttribute($this, 'src', $value);
        }

        /**
         * @param string the URL to the long description of the image.
         */
        public function setDescriptionUrl($value)
        {
                parent::setDescriptionUrl($value);
                if($this->getActiveControl()->canUpdateClientSide())
                        $this->getPage()->getCallbackClient()->setAttribute($this, 'longdesc', $value);
        }

        /**
         * 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 onClick
         * OnClick} event first and then the {@link onCallback OnCallback} event.
         * This method is mainly used by framework and control developers.
         * @param TCallbackEventParameter the event parameter
         */
        public function raiseCallbackEvent($param)
        {
                $this->raisePostBackEvent($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);
        }

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

        /**
         * Register the x and y hidden input names of the position clicked.
         * @param THtmlWriter the renderer.
         */
        public function onPreRender($writer)
        {
                parent::onPreRender($writer);
                $uid = $uid=$this->getUniqueID();
                $this->getPage()->registerPostDataLoader($uid.'_x');
                $this->getPage()->registerPostDataLoader($uid.'_y');
        }

        /**
         * 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());
                $this->getActiveControl()->registerCallbackClientScript(
                        $this->getClientClassName(), $this->getPostBackOptions());
        }

        /**
         * @return string corresponding javascript class name for this TActiveLinkButton.
         */
        protected function getClientClassName()
        {
                return 'Prado.WebUI.TActiveImageButton';
        }
}

?>