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<?php
/**
* @link http://www.yiiframework.com/
* @copyright Copyright (c) 2008 Yii Software LLC
* @license http://www.yiiframework.com/license/
*/
namespace yii\base;
/**
* Behavior is the base class for all behavior classes.
*
* A behavior can be used to enhance the functionality of an existing component without modifying its code.
* In particular, it can "inject" its own methods and properties into the component
* and make them directly accessible via the component. It can also respond to the events triggered in the component
* and thus intercept the normal code execution.
*
* For more details and usage information on Behavior, see the [guide article on behaviors](guide:concept-behaviors).
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @since 2.0
*/
class Behavior extends BaseObject
{
/**
* @var Component|null the owner of this behavior
*/
public $owner;
/**
* @var array Attached events handlers
*/
private $_attachedEvents = [];
/**
* Declares event handlers for the [[owner]]'s events.
*
* Child classes may override this method to declare what PHP callbacks should
* be attached to the events of the [[owner]] component.
*
* The callbacks will be attached to the [[owner]]'s events when the behavior is
* attached to the owner; and they will be detached from the events when
* the behavior is detached from the component.
*
* The callbacks can be any of the following:
*
* - method in this behavior: `'handleClick'`, equivalent to `[$this, 'handleClick']`
* - object method: `[$object, 'handleClick']`
* - static method: `['Page', 'handleClick']`
* - anonymous function: `function ($event) { ... }`
*
* The following is an example:
*
* ```php
* [
* Model::EVENT_BEFORE_VALIDATE => 'myBeforeValidate',
* Model::EVENT_AFTER_VALIDATE => 'myAfterValidate',
* ]
* ```
*
* @return array events (array keys) and the corresponding event handler methods (array values).
*/
public function events()
{
return [];
}
/**
* Attaches the behavior object to the component.
* The default implementation will set the [[owner]] property
* and attach event handlers as declared in [[events]].
* Make sure you call the parent implementation if you override this method.
* @param Component $owner the component that this behavior is to be attached to.
*/
public function attach($owner)
{
$this->owner = $owner;
foreach ($this->events() as $event => $handler) {
$this->_attachedEvents[$event] = $handler;
$owner->on($event, is_string($handler) ? [$this, $handler] : $handler);
}
}
/**
* Detaches the behavior object from the component.
* The default implementation will unset the [[owner]] property
* and detach event handlers declared in [[events]].
* Make sure you call the parent implementation if you override this method.
*/
public function detach()
{
if ($this->owner) {
foreach ($this->_attachedEvents as $event => $handler) {
$this->owner->off($event, is_string($handler) ? [$this, $handler] : $handler);
}
$this->_attachedEvents = [];
$this->owner = null;
}
}
}