<?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;

/**
 * THotSpot class.
 *
 * THotSpot implements the basic functionality common to all hot spot shapes.
 * Derived classes include {@link TCircleHotSpot}, {@link TPolygonHotSpot}
 * and {@link TRectangleHotSpot}.
 *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @package Prado\Web\UI\WebControls
 * @since 3.0
 */
abstract class THotSpot extends TComponent
{
	private $_viewState=array();

	/**
	 * Returns a viewstate value.
	 *
	 * This function is very useful in defining getter functions for component properties
	 * that must be kept in viewstate.
	 * @param string the name of the viewstate value to be returned
	 * @param mixed the default value. If $key is not found in viewstate, $defaultValue will be returned
	 * @return mixed the viewstate value corresponding to $key
	 */
	protected function getViewState($key,$defaultValue=null)
	{
		return isset($this->_viewState[$key])?$this->_viewState[$key]:$defaultValue;
	}

	/**
	 * Sets a viewstate value.
	 *
	 * This function is very useful in defining setter functions for control properties
	 * that must be kept in viewstate.
	 * Make sure that the viewstate value must be serializable and unserializable.
	 * @param string the name of the viewstate value
	 * @param mixed the viewstate value to be set
	 * @param mixed default value. If $value===$defaultValue, the item will be cleared from the viewstate.
	 */
	protected function setViewState($key,$value,$defaultValue=null)
	{
		if($value===$defaultValue)
			unset($this->_viewState[$key]);
		else
			$this->_viewState[$key]=$value;
	}

	/**
	 * @return string shape of the hotspot, can be 'circle', 'rect', 'poly', etc.
	 */
	abstract public function getShape();
	/**
	 * @return string coordinates defining the hotspot shape.
	 */
	abstract public function getCoordinates();

	/**
	 * @return string the access key that allows you to quickly navigate to the HotSpot region. Defaults to ''.
	 */
	public function getAccessKey()
	{
		return $this->getViewState('AccessKey','');
	}

	/**
	 * @param string the access key that allows you to quickly navigate to the HotSpot region.
	 */
	public function setAccessKey($value)
	{
		$this->setViewState('AccessKey',TPropertyValue::ensureString($value),'');
	}

	/**
	 * @return string the alternate text to display for a HotSpot object. Defaults to ''.
	 */
	public function getAlternateText()
	{
		return $this->getViewState('AlternateText','');
	}

	/**
	 * @param string the alternate text to display for a HotSpot object.
	 */
	public function setAlternateText($value)
	{
		$this->setViewState('AlternateText',TPropertyValue::ensureString($value),'');
	}

	/**
	 * @return THotSpotMode the behavior of a HotSpot object when it is clicked. Defaults to THotSpotMode::NotSet.
	 */
	public function getHotSpotMode()
	{
		return $this->getViewState('HotSpotMode',THotSpotMode::NotSet);
	}

	/**
	 * @param THotSpotMode the behavior of a HotSpot object when it is clicked.
	 */
	public function setHotSpotMode($value)
	{
		$this->setViewState('HotSpotMode',TPropertyValue::ensureEnum($value,'THotSpotMode'),THotSpotMode::NotSet);
	}

	/**
	 * @return string the URL to navigate to when a HotSpot object is clicked. Defaults to ''.
	 */
	public function getNavigateUrl()
	{
		return $this->getViewState('NavigateUrl','');
	}

	/**
	 * @param string the URL to navigate to when a HotSpot object is clicked.
	 */
	public function setNavigateUrl($value)
	{
		$this->setViewState('NavigateUrl',TPropertyValue::ensureString($value),'');
	}

	/**
	 * @return string a value that is post back when the HotSpot is clicked. Defaults to ''.
	 */
	public function getPostBackValue()
	{
		return $this->getViewState('PostBackValue','');
	}

	/**
	 * @param string a value that is post back when the HotSpot is clicked.
	 */
	public function setPostBackValue($value)
	{
		$this->setViewState('PostBackValue',TPropertyValue::ensureString($value),'');
	}

	/**
	 * @return integer the tab index of the HotSpot region. Defaults to 0.
	 */
	public function getTabIndex()
	{
		return $this->getViewState('TabIndex',0);
	}

	/**
	 * @param integer the tab index of the HotSpot region.
	 */
	public function setTabIndex($value)
	{
		$this->setViewState('TabIndex',TPropertyValue::ensureInteger($value),0);
	}

	/**
	 * @return boolean whether postback event trigger by this hotspot will cause input validation, default is true
	 */
	public function getCausesValidation()
	{
		return $this->getViewState('CausesValidation',true);
	}

	/**
	 * @param boolean whether postback event trigger by this hotspot will cause input validation
	 */
	public function setCausesValidation($value)
	{
		$this->setViewState('CausesValidation',TPropertyValue::ensureBoolean($value),true);
	}

	/**
	 * @return string the group of validators which the hotspot causes validation upon postback
	 */
	public function getValidationGroup()
	{
		return $this->getViewState('ValidationGroup','');
	}

	/**
	 * @param string the group of validators which the hotspot causes validation upon postback
	 */
	public function setValidationGroup($value)
	{
		$this->setViewState('ValidationGroup',$value,'');
	}

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

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

	/**
	 * @return boolean whether the hotspot has custom attributes
	 */
	public function getHasAttributes()
	{
		if($attributes=$this->getViewState('Attributes',null))
			return $attributes->getCount()>0;
		else
			return false;
	}

	/**
	 * Returns the list of custom attributes.
	 * Custom attributes are name-value pairs that may be rendered
	 * as HTML tags' attributes.
	 * @return TAttributeCollection the list of custom attributes
	 */
	public function getAttributes()
	{
		if($attributes=$this->getViewState('Attributes',null))
			return $attributes;
		else
		{
			$attributes=new TAttributeCollection;
			$this->setViewState('Attributes',$attributes,null);
			return $attributes;
		}
	}

	/**
	 * @return boolean whether the named attribute exists
	 */
	public function hasAttribute($name)
	{
		if($attributes=$this->getViewState('Attributes',null))
			return $attributes->contains($name);
		else
			return false;
	}

	/**
	 * @return string attribute value, null if attribute does not exist
	 */
	public function getAttribute($name)
	{
		if($attributes=$this->getViewState('Attributes',null))
			return $attributes->itemAt($name);
		else
			return null;
	}

	/**
	 * Sets a custom hotspot attribute.
	 * @param string attribute name
	 * @param string value of the attribute
	 */
	public function setAttribute($name,$value)
	{
		$this->getAttributes()->add($name,$value);
	}

	/**
	 * Removes the named attribute.
	 * @param string the name of the attribute to be removed.
	 * @return string attribute value removed, null if attribute does not exist.
	 */
	public function removeAttribute($name)
	{
		if($attributes=$this->getViewState('Attributes',null))
			return $attributes->remove($name);
		else
			return null;
	}

	/**
	 * Renders this hotspot.
	 * @param THtmlWriter
	 */
	public function render($writer)
	{
		$writer->addAttribute('shape',$this->getShape());
		$writer->addAttribute('coords',$this->getCoordinates());
		if(($mode=$this->getHotSpotMode())===THotSpotMode::NotSet)
			$mode=THotSpotMode::Navigate;
		if($mode===THotSpotMode::Navigate)
		{
			$writer->addAttribute('href',$this->getNavigateUrl());
			if(($target=$this->getTarget())!=='')
				$writer->addAttribute('target',$target);
		}
		else if($mode===THotSpotMode::Inactive)
			$writer->addAttribute('nohref','true');
		$text=$this->getAlternateText();
		$writer->addAttribute('title',$text);
		$writer->addAttribute('alt',$text);
		if(($accessKey=$this->getAccessKey())!=='')
			$writer->addAttribute('accesskey',$accessKey);
		if(($tabIndex=$this->getTabIndex())!==0)
			$writer->addAttribute('tabindex',"$tabIndex");
		if($this->getHasAttributes())
		{
			foreach($this->getAttributes() as $name=>$value)
				$writer->addAttribute($name,$value);
		}
		$writer->renderBeginTag('area');
		$writer->renderEndTag();
	}
}