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<?php
/**
* CFormElement class file.
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @link http://www.yiiframework.com/
* @copyright Copyright &copy; 2008-2011 Yii Software LLC
* @license http://www.yiiframework.com/license/
*/
/**
* CFormElement is the base class for presenting all kinds of form element.
*
* CFormElement implements the way to get and set arbitrary attributes.
*
* @property boolean $visible Whether this element is visible and should be rendered.
* @property mixed $parent The direct parent of this element. This could be either a {@link CForm} object or a {@link CBaseController} object
* (a controller or a widget).
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @version $Id$
* @package system.web.form
* @since 1.1
*/
abstract class CFormElement extends CComponent
{
/**
* @var array list of attributes (name=>value) for the HTML element represented by this object.
*/
public $attributes=array();
private $_parent;
private $_visible;
/**
* Renders this element.
* @return string the rendering result
*/
abstract function render();
/**
* Constructor.
* @param mixed $config the configuration for this element.
* @param mixed $parent the direct parent of this element.
* @see configure
*/
public function __construct($config,$parent)
{
$this->configure($config);
$this->_parent=$parent;
}
/**
* Converts the object to a string.
* This is a PHP magic method.
* The default implementation simply calls {@link render} and return
* the rendering result.
* @return string the string representation of this object.
*/
public function __toString()
{
return $this->render();
}
/**
* Returns a property value or an attribute value.
* Do not call this method. This is a PHP magic method that we override
* to allow using the following syntax to read a property or attribute:
* <pre>
* $value=$element->propertyName;
* $value=$element->attributeName;
* </pre>
* @param string $name the property or attribute name
* @return mixed the property or attribute value
* @throws CException if the property or attribute is not defined
* @see __set
*/
public function __get($name)
{
$getter='get'.$name;
if(method_exists($this,$getter))
return $this->$getter();
else if(isset($this->attributes[$name]))
return $this->attributes[$name];
else
throw new CException(Yii::t('yii','Property "{class}.{property}" is not defined.',
array('{class}'=>get_class($this), '{property}'=>$name)));
}
/**
* Sets value of a property or attribute.
* Do not call this method. This is a PHP magic method that we override
* to allow using the following syntax to set a property or attribute.
* <pre>
* $this->propertyName=$value;
* $this->attributeName=$value;
* </pre>
* @param string $name the property or attribute name
* @param mixed $value the property or attribute value
* @see __get
*/
public function __set($name,$value)
{
$setter='set'.$name;
if(method_exists($this,$setter))
$this->$setter($value);
else
$this->attributes[$name]=$value;
}
/**
* Configures this object with property initial values.
* @param mixed $config the configuration for this object. This can be an array
* representing the property names and their initial values.
* It can also be a string representing the file name of the PHP script
* that returns a configuration array.
*/
public function configure($config)
{
if(is_string($config))
$config=require(Yii::getPathOfAlias($config).'.php');
if(is_array($config))
{
foreach($config as $name=>$value)
$this->$name=$value;
}
}
/**
* Returns a value indicating whether this element is visible and should be rendered.
* This method will call {@link evaluateVisible} to determine the visibility of this element.
* @return boolean whether this element is visible and should be rendered.
*/
public function getVisible()
{
if($this->_visible===null)
$this->_visible=$this->evaluateVisible();
return $this->_visible;
}
/**
* @param boolean $value whether this element is visible and should be rendered.
*/
public function setVisible($value)
{
$this->_visible=$value;
}
/**
* @return mixed the direct parent of this element. This could be either a {@link CForm} object or a {@link CBaseController} object
* (a controller or a widget).
*/
public function getParent()
{
return $this->_parent;
}
/**
* Evaluates the visibility of this element.
* Child classes should override this method to implement the actual algorithm
* for determining the visibility.
* @return boolean whether this element is visible. Defaults to true.
*/
protected function evaluateVisible()
{
return true;
}
}
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