<?php
/**
 * TActiveLabel class file.
 *
 * @author Wei Zhuo <weizhuo[at]gmail[dot]com>
 * @link http://www.pradosoft.com/
 * @copyright Copyright &copy; 2005-2014 PradoSoft
 * @license http://www.pradosoft.com/license/
 * @package Prado\Web\UI\ActiveControls
 */

namespace Prado\Web\UI\ActiveControls;

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

/**
 * TActiveLabel class
 *
 * The active control counterpart of TLabel component. When
 * {@link TBaseActiveControl::setEnableUpdate ActiveControl.EnableUpdate}
 * property is true the during a callback request, setting {@link setText Text}
 * property will also set the text of the label on the client upon callback
 * completion. Similarly, setting {@link setForControl ForControl} will also set
 * the client-side "for" attribute on the label.
 *
 * @author Wei Zhuo <weizhuo[at]gmail[dot]com>
 * @package Prado\Web\UI\ActiveControls
 * @since 3.1
 */
class TActiveLabel extends TLabel implements IActiveControl
{
	/**
	 * 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();
	}

	/**
	 * On callback response, the inner HTML of the label is updated.
	 * @param string the text value of the label
	 */
	public function setText($value)
	{
		parent::setText($value);
		if($this->getActiveControl()->canUpdateClientSide())
			$this->getPage()->getCallbackClient()->update($this, $value);
	}

	/**
	 * Sets the ID of the control that the label is associated with.
	 * The control must be locatable via {@link TControl::findControl} using the ID.
	 * On callback response, the For attribute of the label is updated.
	 * @param string the associated control ID
	 */
	public function setForControl($value)
	{
		parent::setForControl($value);
		if($this->getActiveControl()->canUpdateClientSide())
		{
			$id=$this->findControl($value)->getClientID();
			$this->getPage()->getCallbackClient()->setAttribute($this, 'for', $id);
		}
	}

	/**
	 * Adds attribute id to the renderer.
	 * @param THtmlWriter the writer used for the rendering purpose
	 */
	protected function addAttributesToRender($writer) {
	    $writer->addAttribute('id',$this->getClientID());
	    parent::addAttributesToRender($writer);
	}
}