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<?php
/**
* TActiveLinkButton 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
*/
/**
* Load active control adapter.
*/
Prado::using('System.Web.UI.ActiveControls.TActiveControlAdapter');
/**
* TActiveLinkButton is the active control counter part to TLinkButton.
*
* When a TActiveLinkButton 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.
*
* When the {@link TBaseActiveCallbackControl::setEnableUpdate ActiveControl.EnableUpdate}
* property is true, changing the {@link setText Text} property during callback request
* will update the link text upon callback response completion.
*
* @author Wei Zhuo <weizhuo[at]gmail[dot]com>
* @package System.Web.UI.ActiveControls
* @since 3.1
*/
class TActiveLinkButton extends TLinkButton 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 TBaseActiveCallbackControl standard callback control options.
*/
public function getActiveControl()
{
return $this->getAdapter()->getBaseActiveControl();
}
/**
* @return TCallbackClientSide client side request options.
*/
public function getClientSide()
{
return $this->getAdapter()->getBaseActiveControl()->getClientSide();
}
/**
* Raises the callback event. This method is required by
* {@link ICallbackEventHandlerICallbackEventHandler} interface. If
* {@link getCausesValidation CausesValidation} is true, it will
* invoke the page's {@link TPage::validate validate} method first. It will raise
* {@link onClick OnClick} event first and then the {@link onCallback OnCallback}
* event.
* This method is mainly used by framework and control developers.
* @param TCallbackEventParameter the event parameter
*/
public function raiseCallbackEvent($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, $param);
}
/**
* Updates the link text on the client-side if the
* {@link setEnableUpdate EnableUpdate} property is set to true.
* @param string caption of the button
*/
public function setText($value)
{
if(parent::getText() === $value)
return;
parent::setText($value);
if($this->getActiveControl()->canUpdateClientSide())
$this->getPage()->getCallbackClient()->update($this, $value);
}
/**
* Override parent implementation, no javascript is rendered here instead
* the javascript required for active control is registered in {@link addAttributesToRender}.
*/
protected function renderClientControlScript($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->getEnabled(true))
{
$this->getActiveControl()->registerCallbackClientScript(
$this->getClientClassName(), $this->getPostBackOptions());
}
}
/**
* Ensures that the anchor is rendered correctly when its Enabled property
* changes in a callback
* @param bool enabled
*/
public function setEnabled($value)
{
if(parent::getEnabled() === $value)
return;
parent::setEnabled($value);
if($this->getActiveControl()->canUpdateClientSide())
{
if($this->getEnabled(true))
{
$nop = "javascript:;//".$this->getClientID();
$this->getPage()->getCallbackClient()->setAttribute($this, 'href', $nop);
$this->getActiveControl()->registerCallbackClientScript(
$this->getClientClassName(), $this->getPostBackOptions());
} else {
$this->getPage()->getCallbackClient()->setAttribute($this, 'href', false);
}
}
}
/**
* @return string corresponding javascript class name for this TActiveLinkButton.
*/
protected function getClientClassName()
{
return 'Prado.WebUI.TActiveLinkButton';
}
}
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