yiiapi/framework/base/CComponent.php

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<?php
/**
 * This file contains the foundation classes for component-based and event-driven programming.
 *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @link http://www.yiiframework.com/
 * @copyright 2008-2013 Yii Software LLC
 * @license http://www.yiiframework.com/license/
 */

/**
 * CComponent is the base class for all components.
 *
 * CComponent implements the protocol of defining, using properties and events.
 *
 * A property is defined by a getter method, and/or a setter method.
 * Properties can be accessed in the way like accessing normal object members.
 * Reading or writing a property will cause the invocation of the corresponding
 * getter or setter method, e.g
 * <pre>
 * $a=$component->text;     // equivalent to $a=$component->getText();
 * $component->text='abc';  // equivalent to $component->setText('abc');
 * </pre>
 * The signatures of getter and setter methods are as follows,
 * <pre>
 * // getter, defines a readable property 'text'
 * public function getText() { ... }
 * // setter, defines a writable property 'text' with $value to be set to the property
 * public function setText($value) { ... }
 * </pre>
 *
 * An event is defined by the presence of a method whose name starts with 'on'.
 * The event name is the method name. When an event is raised, functions
 * (called event handlers) attached to the event will be invoked automatically.
 *
 * An event can be raised by calling {@link raiseEvent} method, upon which
 * the attached event handlers will be invoked automatically in the order they
 * are attached to the event. Event handlers must have the following signature,
 * <pre>
 * function eventHandler($event) { ... }
 * </pre>
 * where $event includes parameters associated with the event.
 *
 * To attach an event handler to an event, see {@link attachEventHandler}.
 * You can also use the following syntax:
 * <pre>
 * $component->onClick=$callback;    // or $component->onClick->add($callback);
 * </pre>
 * where $callback refers to a valid PHP callback. Below we show some callback examples:
 * <pre>
 * 'handleOnClick'                   // handleOnClick() is a global function
 * array($object,'handleOnClick')    // using $object->handleOnClick()
 * array('Page','handleOnClick')     // using Page::handleOnClick()
 * </pre>
 *
 * To raise an event, use {@link raiseEvent}. The on-method defining an event is
 * commonly written like the following:
 * <pre>
 * public function onClick($event)
 * {