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<?php
/**
* TActiveImageButton class file.
*
* @author Wei Zhuo <weizhuo[at]gamil[dot]com>
* @link https://github.com/pradosoft/prado
* @copyright Copyright © 2005-2016 The PRADO Group
* @license https://github.com/pradosoft/prado/blob/master/COPYRIGHT
* @package System.Web.UI.ActiveControls
*/
/**
* TActiveImageButton class.
*
* TActiveImageButton is the active control counter part to TImageButton.
* 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>
* @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)
{
if(parent::getAlternateText() === $value)
return;
parent::setAlternateText($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)
{
if(parent::getImageAlign() === $value)
return;
parent::setImageAlign($value);
if($this->getActiveControl()->canUpdateClientSide())
$this->getPage()->getCallbackClient()->setAttribute($this, 'align', $value);
}
/**
* @param string the URL of the image file
*/
public function setImageUrl($value)
{
if(parent::getImageUrl() === $value)
return;
parent::setImageUrl($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)
{
if(parent::getDescriptionUrl() === $value)
return;
parent::setDescriptionUrl($value);
if($this->getActiveControl()->canUpdateClientSide())
$this->getPage()->getCallbackClient()->setAttribute($this, 'longdesc', $value);
}
/**
* Raises the callback event. This method is required by
* {@link ICallbackEventHandler ICallbackEventHandler} interface. If
* {@link getCausesValidation CausesValidation} is true, it will invoke the page's
* {@link TPage::validate} method first. It will raise
* {@link onClick OnClick} event first and then the {@link onCallback OnCallback} event.
* This method is mainly used by framework and control developers.
* @param TCallbackEventParameter the event parameter
*/
public function raiseCallbackEvent($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)
{
}
/**
* 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';
}
}
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