<?php
/**
 * TImageMap and related class file.
 *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @link http://www.pradosoft.com/
 * @copyright Copyright &copy; 2005-2014 PradoSoft
 * @license http://www.pradosoft.com/license/
 * @package Prado\Web\UI\WebControls
 */

namespace Prado\Web\UI\WebControls;
use Prado\TPropertyValue;

/**
 * TImageMap class
 *
 * TImageMap represents an image on a page. Hotspot regions can be defined
 * within the image. Depending on the {@link setHotSpotMode HotSpotMode},
 * clicking on the hotspots may trigger a postback or navigate to a specified
 * URL. The hotspots defined may be accessed via {@link getHotSpots HotSpots}.
 * Each hotspot is described as a {@link THotSpot}, which can be a circle,
 * rectangle, polygon, etc. To add hotspot in a template, use the following,
 * <code>
 *  <com:TImageMap>
 *    <com:TCircleHotSpot ... />
 *    <com:TRectangleHotSpot ... />
 *    <com:TPolygonHotSpot ... />
 *  </com:TImageMap>
 * </code>
 *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @package Prado\Web\UI\WebControls
 * @since 3.0
 */
class TImageMap extends TImage implements \Prado\Web\UI\IPostBackEventHandler
{
	const MAP_NAME_PREFIX='ImageMap';

	/**
	 * Processes an object that is created during parsing template.
	 * This method adds {@link THotSpot} objects into the hotspot collection
	 * of the imagemap.
	 * @param string|TComponent text string or component parsed and instantiated in template
	 */
	public function addParsedObject($object)
	{
		if($object instanceof THotSpot)
			$this->getHotSpots()->add($object);
	}

	/**
	 * Adds attribute name-value pairs to renderer.
	 * This overrides the parent implementation with additional imagemap specific attributes.
	 * @param THtmlWriter the writer used for the rendering purpose
	 */
	protected function addAttributesToRender($writer)
	{
		parent::addAttributesToRender($writer);
		if($this->getHotSpots()->getCount()>0)
		{
			$writer->addAttribute('usemap','#'.self::MAP_NAME_PREFIX.$this->getClientID());
			$writer->addAttribute('id',$this->getUniqueID());
		}
		if($this->getEnabled() && !$this->getEnabled(true))
			$writer->addAttribute('disabled','disabled');
	}

	/**
	 * Renders this imagemap.
	 * @param THtmlWriter
	 */
	public function render($writer)
	{
		parent::render($writer);

		$hotspots=$this->getHotSpots();

		if($hotspots->getCount()>0)
		{
			$clientID=$this->getClientID();
			$cs=$this->getPage()->getClientScript();
			$writer->writeLine();
			$writer->addAttribute('name',self::MAP_NAME_PREFIX.$clientID);
			$writer->renderBeginTag('map');
			$writer->writeLine();
			if(($mode=$this->getHotSpotMode())===THotSpotMode::NotSet)
				$mode=THotSpotMode::Navigate;
			$target=$this->getTarget();
			$i=0;
			$options['EventTarget'] = $this->getUniqueID();
			$options['StopEvent'] = true;
			$cs=$this->getPage()->getClientScript();
			foreach($hotspots as $hotspot)
			{
				if($hotspot->getHotSpotMode()===THotSpotMode::NotSet)
					$hotspot->setHotSpotMode($mode);
				if($target!=='' && $hotspot->getTarget()==='')
					$hotspot->setTarget($target);
				if($hotspot->getHotSpotMode()===THotSpotMode::PostBack)
				{
					$id=$clientID.'_'.$i;
					$writer->addAttribute('id',$id);
					$writer->addAttribute('href','#'.$id); //create unique no-op url references
					$options['ID']=$id;
					$options['EventParameter']="$i";
					$options['CausesValidation']=$hotspot->getCausesValidation();
					$options['ValidationGroup']=$hotspot->getValidationGroup();
					$cs->registerPostBackControl($this->getClientClassName(),$options);
				}
				$hotspot->render($writer);
				$writer->writeLine();
				$i++;
			}
			$writer->renderEndTag();
		}
	}

	/**
	 * Gets the name of the javascript class responsible for performing postback for this control.
	 * This method overrides the parent implementation.
	 * @return string the javascript class name
	 */
	protected function getClientClassName()
	{
		return 'Prado.WebUI.TImageMap';
	}

	/**
	 * Raises the postback event.
	 * This method is required by {@link IPostBackEventHandler} interface.
	 * This method is mainly used by framework and control developers.
	 * @param TEventParameter the event parameter
	 */
	public function raisePostBackEvent($param)
	{
		$postBackValue=null;
		if($param!=='')
		{
			$index=TPropertyValue::ensureInteger($param);
			$hotspots=$this->getHotSpots();
			if($index>=0 && $index<$hotspots->getCount())
			{
				$hotspot=$hotspots->itemAt($index);
				if(($mode=$hotspot->getHotSpotMode())===THotSpotMode::NotSet)
					$mode=$this->getHotSpotMode();
				if($mode===THotSpotMode::PostBack)
				{
					$postBackValue=$hotspot->getPostBackValue();
					if($hotspot->getCausesValidation())
						$this->getPage()->validate($hotspot->getValidationGroup());
				}
			}
		}
		if($postBackValue!==null)
			$this->onClick(new TImageMapEventParameter($postBackValue));
	}

	/**
	 * @return THotSpotMode the behavior of hotspot regions in this imagemap when they are clicked. Defaults to THotSpotMode::NotSet.
	 */
	public function getHotSpotMode()
	{
		return $this->getViewState('HotSpotMode',THotSpotMode::NotSet);
	}

	/**
	 * Sets the behavior of hotspot regions in this imagemap when they are clicked.
	 * If an individual hotspot has a mode other than 'NotSet', the mode set in this
	 * imagemap will be ignored. By default, 'NotSet' is equivalent to 'Navigate'.
	 * @param THotSpotMode the behavior of hotspot regions in this imagemap when they are clicked.
	 */
	public function setHotSpotMode($value)
	{
		$this->setViewState('HotSpotMode',TPropertyValue::ensureEnum($value,'THotSpotMode'),THotSpotMode::NotSet);
	}

	/**
	 * @return THotSpotCollection collection of hotspots defined in this imagemap.
	 */
	public function getHotSpots()
	{
		if(($hotspots=$this->getViewState('HotSpots',null))===null)
		{
			$hotspots=new THotSpotCollection;
			$this->setViewState('HotSpots',$hotspots);
		}
		return $hotspots;
	}

	/**
	 * @return string  the target window or frame to display the new page when a hotspot region is clicked within the imagemap. Defaults to ''.
	 */
	public function getTarget()
	{
		return $this->getViewState('Target','');
	}

	/**
	 * @param string  the target window or frame to display the new page when a hotspot region is clicked within the imagemap.
	 */
	public function setTarget($value)
	{
		$this->setViewState('Target',TPropertyValue::ensureString($value),'');
	}

	/**
	 * Raises <b>OnClick</b> event.
	 * This method is invoked when a hotspot region is clicked within the imagemap.
	 * If you override this method, be sure to call the parent implementation
	 * so that the event handler can be invoked.
	 * @param TImageMapEventParameter event parameter to be passed to the event handlers
	 */
	public function onClick($param)
	{
		$this->raiseEvent('OnClick',$this,$param);
	}
}