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772 lines
27 KiB
PHP
772 lines
27 KiB
PHP
<?php
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/**
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* @link https://www.yiiframework.com/
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* @copyright Copyright (c) 2008 Yii Software LLC
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* @license https://www.yiiframework.com/license/
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*/
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namespace yii\base;
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use Yii;
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use yii\helpers\StringHelper;
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/**
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* Component is the base class that implements the *property*, *event* and *behavior* features.
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*
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* Component provides the *event* and *behavior* features, in addition to the *property* feature which is implemented in
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* its parent class [[\yii\base\BaseObject|BaseObject]].
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*
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* Event is a way to "inject" custom code into existing code at certain places. For example, a comment object can trigger
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* an "add" event when the user adds a comment. We can write custom code and attach it to this event so that when the event
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* is triggered (i.e. comment will be added), our custom code will be executed.
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*
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* An event is identified by a name that should be unique within the class it is defined at. Event names are *case-sensitive*.
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*
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* One or multiple PHP callbacks, called *event handlers*, can be attached to an event. You can call [[trigger()]] to
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* raise an event. When an event is raised, the event handlers will be invoked automatically in the order they were
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* attached.
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*
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* To attach an event handler to an event, call [[on()]]:
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*
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* ```php
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* $post->on('update', function ($event) {
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* // send email notification
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* });
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* ```
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*
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* In the above, an anonymous function is attached to the "update" event of the post. You may attach
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* the following types of event handlers:
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*
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* - anonymous function: `function ($event) { ... }`
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* - object method: `[$object, 'handleAdd']`
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* - static class method: `['Page', 'handleAdd']`
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* - global function: `'handleAdd'`
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*
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* The signature of an event handler should be like the following:
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*
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* ```php
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* function foo($event)
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* ```
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*
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* where `$event` is an [[Event]] object which includes parameters associated with the event.
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*
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* You can also attach a handler to an event when configuring a component with a configuration array.
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* The syntax is like the following:
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*
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* ```php
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* [
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* 'on add' => function ($event) { ... }
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* ]
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* ```
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*
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* where `on add` stands for attaching an event to the `add` event.
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*
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* Sometimes, you may want to associate extra data with an event handler when you attach it to an event
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* and then access it when the handler is invoked. You may do so by
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*
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* ```php
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* $post->on('update', function ($event) {
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* // the data can be accessed via $event->data
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* }, $data);
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* ```
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*
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* A behavior is an instance of [[Behavior]] or its child class. A component can be attached with one or multiple
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* behaviors. When a behavior is attached to a component, its public properties and methods can be accessed via the
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* component directly, as if the component owns those properties and methods.
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*
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* To attach a behavior to a component, declare it in [[behaviors()]], or explicitly call [[attachBehavior]]. Behaviors
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* declared in [[behaviors()]] are automatically attached to the corresponding component.
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*
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* One can also attach a behavior to a component when configuring it with a configuration array. The syntax is like the
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* following:
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*
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* ```php
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* [
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* 'as tree' => [
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* 'class' => 'Tree',
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* ],
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* ]
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* ```
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*
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* where `as tree` stands for attaching a behavior named `tree`, and the array will be passed to [[\Yii::createObject()]]
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* to create the behavior object.
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*
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* For more details and usage information on Component, see the [guide article on components](guide:concept-components).
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*
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* @property-read Behavior[] $behaviors List of behaviors attached to this component.
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*
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* @author Qiang Xue <qiang.xue@gmail.com>
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* @since 2.0
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*/
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class Component extends BaseObject
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{
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/**
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* @var array the attached event handlers (event name => handlers)
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*/
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private $_events = [];
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/**
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* @var array the event handlers attached for wildcard patterns (event name wildcard => handlers)
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* @since 2.0.14
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*/
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private $_eventWildcards = [];
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/**
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* @var Behavior[]|null the attached behaviors (behavior name => behavior). This is `null` when not initialized.
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*/
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private $_behaviors;
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/**
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* Returns the value of a component property.
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*
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* This method will check in the following order and act accordingly:
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*
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* - a property defined by a getter: return the getter result
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* - a property of a behavior: return the behavior property value
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*
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* Do not call this method directly as it is a PHP magic method that
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* will be implicitly called when executing `$value = $component->property;`.
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* @param string $name the property name
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* @return mixed the property value or the value of a behavior's property
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* @throws UnknownPropertyException if the property is not defined
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* @throws InvalidCallException if the property is write-only.
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* @see __set()
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*/
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public function __get($name)
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{
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$getter = 'get' . $name;
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if (method_exists($this, $getter)) {
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// read property, e.g. getName()
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return $this->$getter();
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}
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// behavior property
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$this->ensureBehaviors();
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foreach ($this->_behaviors as $behavior) {
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if ($behavior->canGetProperty($name)) {
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return $behavior->$name;
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}
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}
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if (method_exists($this, 'set' . $name)) {
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throw new InvalidCallException('Getting write-only property: ' . get_class($this) . '::' . $name);
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}
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throw new UnknownPropertyException('Getting unknown property: ' . get_class($this) . '::' . $name);
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}
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/**
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* Sets the value of a component property.
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*
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* This method will check in the following order and act accordingly:
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*
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* - a property defined by a setter: set the property value
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* - an event in the format of "on xyz": attach the handler to the event "xyz"
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* - a behavior in the format of "as xyz": attach the behavior named as "xyz"
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* - a property of a behavior: set the behavior property value
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*
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* Do not call this method directly as it is a PHP magic method that
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* will be implicitly called when executing `$component->property = $value;`.
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* @param string $name the property name or the event name
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* @param mixed $value the property value
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* @throws UnknownPropertyException if the property is not defined
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* @throws InvalidCallException if the property is read-only.
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* @see __get()
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*/
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public function __set($name, $value)
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{
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$setter = 'set' . $name;
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if (method_exists($this, $setter)) {
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// set property
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$this->$setter($value);
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return;
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} elseif (strncmp($name, 'on ', 3) === 0) {
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// on event: attach event handler
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$this->on(trim(substr($name, 3)), $value);
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return;
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} elseif (strncmp($name, 'as ', 3) === 0) {
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// as behavior: attach behavior
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$name = trim(substr($name, 3));
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$this->attachBehavior($name, $value instanceof Behavior ? $value : Yii::createObject($value));
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return;
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}
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// behavior property
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$this->ensureBehaviors();
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foreach ($this->_behaviors as $behavior) {
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if ($behavior->canSetProperty($name)) {
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$behavior->$name = $value;
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return;
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}
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}
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if (method_exists($this, 'get' . $name)) {
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throw new InvalidCallException('Setting read-only property: ' . get_class($this) . '::' . $name);
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}
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throw new UnknownPropertyException('Setting unknown property: ' . get_class($this) . '::' . $name);
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}
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/**
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* Checks if a property is set, i.e. defined and not null.
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*
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* This method will check in the following order and act accordingly:
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*
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* - a property defined by a setter: return whether the property is set
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* - a property of a behavior: return whether the property is set
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* - return `false` for non existing properties
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*
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* Do not call this method directly as it is a PHP magic method that
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* will be implicitly called when executing `isset($component->property)`.
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* @param string $name the property name or the event name
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* @return bool whether the named property is set
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* @see https://www.php.net/manual/en/function.isset.php
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*/
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public function __isset($name)
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{
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$getter = 'get' . $name;
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if (method_exists($this, $getter)) {
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return $this->$getter() !== null;
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}
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// behavior property
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$this->ensureBehaviors();
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foreach ($this->_behaviors as $behavior) {
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if ($behavior->canGetProperty($name)) {
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return $behavior->$name !== null;
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}
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}
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return false;
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}
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/**
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* Sets a component property to be null.
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*
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* This method will check in the following order and act accordingly:
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*
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* - a property defined by a setter: set the property value to be null
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* - a property of a behavior: set the property value to be null
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*
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* Do not call this method directly as it is a PHP magic method that
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* will be implicitly called when executing `unset($component->property)`.
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* @param string $name the property name
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* @throws InvalidCallException if the property is read only.
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* @see https://www.php.net/manual/en/function.unset.php
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*/
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public function __unset($name)
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{
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$setter = 'set' . $name;
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if (method_exists($this, $setter)) {
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$this->$setter(null);
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return;
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}
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// behavior property
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$this->ensureBehaviors();
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foreach ($this->_behaviors as $behavior) {
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if ($behavior->canSetProperty($name)) {
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$behavior->$name = null;
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return;
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}
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}
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throw new InvalidCallException('Unsetting an unknown or read-only property: ' . get_class($this) . '::' . $name);
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}
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/**
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* Calls the named method which is not a class method.
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*
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* This method will check if any attached behavior has
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* the named method and will execute it if available.
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*
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* Do not call this method directly as it is a PHP magic method that
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* will be implicitly called when an unknown method is being invoked.
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* @param string $name the method name
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* @param array $params method parameters
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* @return mixed the method return value
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* @throws UnknownMethodException when calling unknown method
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*/
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public function __call($name, $params)
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{
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$this->ensureBehaviors();
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foreach ($this->_behaviors as $object) {
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if ($object->hasMethod($name)) {
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return call_user_func_array([$object, $name], $params);
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}
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}
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throw new UnknownMethodException('Calling unknown method: ' . get_class($this) . "::$name()");
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}
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/**
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* This method is called after the object is created by cloning an existing one.
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* It removes all behaviors because they are attached to the old object.
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*/
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public function __clone()
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{
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$this->_events = [];
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$this->_eventWildcards = [];
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$this->_behaviors = null;
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}
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/**
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* Returns a value indicating whether a property is defined for this component.
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*
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* A property is defined if:
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*
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* - the class has a getter or setter method associated with the specified name
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* (in this case, property name is case-insensitive);
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* - the class has a member variable with the specified name (when `$checkVars` is true);
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* - an attached behavior has a property of the given name (when `$checkBehaviors` is true).
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*
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* @param string $name the property name
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* @param bool $checkVars whether to treat member variables as properties
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* @param bool $checkBehaviors whether to treat behaviors' properties as properties of this component
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* @return bool whether the property is defined
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* @see canGetProperty()
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* @see canSetProperty()
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*/
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public function hasProperty($name, $checkVars = true, $checkBehaviors = true)
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{
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return $this->canGetProperty($name, $checkVars, $checkBehaviors) || $this->canSetProperty($name, false, $checkBehaviors);
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}
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/**
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* Returns a value indicating whether a property can be read.
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*
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* A property can be read if:
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*
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* - the class has a getter method associated with the specified name
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* (in this case, property name is case-insensitive);
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* - the class has a member variable with the specified name (when `$checkVars` is true);
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* - an attached behavior has a readable property of the given name (when `$checkBehaviors` is true).
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*
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* @param string $name the property name
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* @param bool $checkVars whether to treat member variables as properties
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* @param bool $checkBehaviors whether to treat behaviors' properties as properties of this component
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* @return bool whether the property can be read
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* @see canSetProperty()
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*/
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public function canGetProperty($name, $checkVars = true, $checkBehaviors = true)
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{
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if (method_exists($this, 'get' . $name) || $checkVars && property_exists($this, $name)) {
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return true;
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} elseif ($checkBehaviors) {
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$this->ensureBehaviors();
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foreach ($this->_behaviors as $behavior) {
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if ($behavior->canGetProperty($name, $checkVars)) {
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return true;
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}
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}
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}
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return false;
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}
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/**
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* Returns a value indicating whether a property can be set.
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*
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* A property can be written if:
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*
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* - the class has a setter method associated with the specified name
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* (in this case, property name is case-insensitive);
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* - the class has a member variable with the specified name (when `$checkVars` is true);
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* - an attached behavior has a writable property of the given name (when `$checkBehaviors` is true).
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*
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* @param string $name the property name
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* @param bool $checkVars whether to treat member variables as properties
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* @param bool $checkBehaviors whether to treat behaviors' properties as properties of this component
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* @return bool whether the property can be written
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* @see canGetProperty()
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*/
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public function canSetProperty($name, $checkVars = true, $checkBehaviors = true)
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{
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if (method_exists($this, 'set' . $name) || $checkVars && property_exists($this, $name)) {
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return true;
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} elseif ($checkBehaviors) {
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$this->ensureBehaviors();
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foreach ($this->_behaviors as $behavior) {
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if ($behavior->canSetProperty($name, $checkVars)) {
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return true;
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}
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}
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}
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return false;
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}
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/**
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* Returns a value indicating whether a method is defined.
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*
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* A method is defined if:
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*
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* - the class has a method with the specified name
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* - an attached behavior has a method with the given name (when `$checkBehaviors` is true).
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*
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* @param string $name the property name
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* @param bool $checkBehaviors whether to treat behaviors' methods as methods of this component
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* @return bool whether the method is defined
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*/
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public function hasMethod($name, $checkBehaviors = true)
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{
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if (method_exists($this, $name)) {
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return true;
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} elseif ($checkBehaviors) {
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$this->ensureBehaviors();
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foreach ($this->_behaviors as $behavior) {
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if ($behavior->hasMethod($name)) {
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return true;
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}
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}
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}
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return false;
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}
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/**
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* Returns a list of behaviors that this component should behave as.
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*
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* Child classes may override this method to specify the behaviors they want to behave as.
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*
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* The return value of this method should be an array of behavior objects or configurations
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* indexed by behavior names. A behavior configuration can be either a string specifying
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* the behavior class or an array of the following structure:
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*
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* ```php
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* 'behaviorName' => [
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* 'class' => 'BehaviorClass',
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* 'property1' => 'value1',
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* 'property2' => 'value2',
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* ]
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* ```
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*
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* Note that a behavior class must extend from [[Behavior]]. Behaviors can be attached using a name or anonymously.
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* When a name is used as the array key, using this name, the behavior can later be retrieved using [[getBehavior()]]
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* or be detached using [[detachBehavior()]]. Anonymous behaviors can not be retrieved or detached.
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*
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* Behaviors declared in this method will be attached to the component automatically (on demand).
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*
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* @return array the behavior configurations.
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*/
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public function behaviors()
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{
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return [];
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}
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/**
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* Returns a value indicating whether there is any handler attached to the named event.
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* @param string $name the event name
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* @return bool whether there is any handler attached to the event.
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*/
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public function hasEventHandlers($name)
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{
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$this->ensureBehaviors();
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if (!empty($this->_events[$name])) {
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return true;
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}
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foreach ($this->_eventWildcards as $wildcard => $handlers) {
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if (!empty($handlers) && StringHelper::matchWildcard($wildcard, $name)) {
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return true;
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}
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}
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return Event::hasHandlers($this, $name);
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}
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/**
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* Attaches an event handler to an event.
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*
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* The event handler must be a valid PHP callback. The following are
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* some examples:
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*
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* ```
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* function ($event) { ... } // anonymous function
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* [$object, 'handleClick'] // $object->handleClick()
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* ['Page', 'handleClick'] // Page::handleClick()
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* 'handleClick' // global function handleClick()
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* ```
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*
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* The event handler must be defined with the following signature,
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*
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* ```
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* function ($event)
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* ```
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*
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* where `$event` is an [[Event]] object which includes parameters associated with the event.
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*
|
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* Since 2.0.14 you can specify event name as a wildcard pattern:
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*
|
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* ```php
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* $component->on('event.group.*', function ($event) {
|
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* Yii::trace($event->name . ' is triggered.');
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* });
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* ```
|
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*
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* @param string $name the event name
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* @param callable $handler the event handler
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* @param mixed $data the data to be passed to the event handler when the event is triggered.
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* When the event handler is invoked, this data can be accessed via [[Event::data]].
|
|
* @param bool $append whether to append new event handler to the end of the existing
|
|
* handler list. If false, the new handler will be inserted at the beginning of the existing
|
|
* handler list.
|
|
* @see off()
|
|
*/
|
|
public function on($name, $handler, $data = null, $append = true)
|
|
{
|
|
$this->ensureBehaviors();
|
|
|
|
if (strpos($name, '*') !== false) {
|
|
if ($append || empty($this->_eventWildcards[$name])) {
|
|
$this->_eventWildcards[$name][] = [$handler, $data];
|
|
} else {
|
|
array_unshift($this->_eventWildcards[$name], [$handler, $data]);
|
|
}
|
|
return;
|
|
}
|
|
|
|
if ($append || empty($this->_events[$name])) {
|
|
$this->_events[$name][] = [$handler, $data];
|
|
} else {
|
|
array_unshift($this->_events[$name], [$handler, $data]);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Detaches an existing event handler from this component.
|
|
*
|
|
* This method is the opposite of [[on()]].
|
|
*
|
|
* Note: in case wildcard pattern is passed for event name, only the handlers registered with this
|
|
* wildcard will be removed, while handlers registered with plain names matching this wildcard will remain.
|
|
*
|
|
* @param string $name event name
|
|
* @param callable|null $handler the event handler to be removed.
|
|
* If it is null, all handlers attached to the named event will be removed.
|
|
* @return bool if a handler is found and detached
|
|
* @see on()
|
|
*/
|
|
public function off($name, $handler = null)
|
|
{
|
|
$this->ensureBehaviors();
|
|
if (empty($this->_events[$name]) && empty($this->_eventWildcards[$name])) {
|
|
return false;
|
|
}
|
|
if ($handler === null) {
|
|
unset($this->_events[$name], $this->_eventWildcards[$name]);
|
|
return true;
|
|
}
|
|
|
|
$removed = false;
|
|
// plain event names
|
|
if (isset($this->_events[$name])) {
|
|
foreach ($this->_events[$name] as $i => $event) {
|
|
if ($event[0] === $handler) {
|
|
unset($this->_events[$name][$i]);
|
|
$removed = true;
|
|
}
|
|
}
|
|
if ($removed) {
|
|
$this->_events[$name] = array_values($this->_events[$name]);
|
|
return true;
|
|
}
|
|
}
|
|
|
|
// wildcard event names
|
|
if (isset($this->_eventWildcards[$name])) {
|
|
foreach ($this->_eventWildcards[$name] as $i => $event) {
|
|
if ($event[0] === $handler) {
|
|
unset($this->_eventWildcards[$name][$i]);
|
|
$removed = true;
|
|
}
|
|
}
|
|
if ($removed) {
|
|
$this->_eventWildcards[$name] = array_values($this->_eventWildcards[$name]);
|
|
// remove empty wildcards to save future redundant regex checks:
|
|
if (empty($this->_eventWildcards[$name])) {
|
|
unset($this->_eventWildcards[$name]);
|
|
}
|
|
}
|
|
}
|
|
|
|
return $removed;
|
|
}
|
|
|
|
/**
|
|
* Triggers an event.
|
|
*
|
|
* This method represents the happening of an event. It invokes all attached handlers for the event
|
|
* including class-level handlers.
|
|
*
|
|
* @param string $name the event name
|
|
* @param Event|null $event the event instance. If not set, a default [[Event]] object will be created.
|
|
*/
|
|
public function trigger($name, Event $event = null)
|
|
{
|
|
$this->ensureBehaviors();
|
|
|
|
$eventHandlers = [];
|
|
foreach ($this->_eventWildcards as $wildcard => $handlers) {
|
|
if (StringHelper::matchWildcard($wildcard, $name)) {
|
|
$eventHandlers[] = $handlers;
|
|
}
|
|
}
|
|
if (!empty($this->_events[$name])) {
|
|
$eventHandlers[] = $this->_events[$name];
|
|
}
|
|
|
|
if (!empty($eventHandlers)) {
|
|
$eventHandlers = call_user_func_array('array_merge', $eventHandlers);
|
|
if ($event === null) {
|
|
$event = new Event();
|
|
}
|
|
if ($event->sender === null) {
|
|
$event->sender = $this;
|
|
}
|
|
$event->handled = false;
|
|
$event->name = $name;
|
|
foreach ($eventHandlers as $handler) {
|
|
$event->data = $handler[1];
|
|
call_user_func($handler[0], $event);
|
|
// stop further handling if the event is handled
|
|
if ($event->handled) {
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
// invoke class-level attached handlers
|
|
Event::trigger($this, $name, $event);
|
|
}
|
|
|
|
/**
|
|
* Returns the named behavior object.
|
|
* @param string $name the behavior name
|
|
* @return Behavior|null the behavior object, or null if the behavior does not exist
|
|
*/
|
|
public function getBehavior($name)
|
|
{
|
|
$this->ensureBehaviors();
|
|
return isset($this->_behaviors[$name]) ? $this->_behaviors[$name] : null;
|
|
}
|
|
|
|
/**
|
|
* Returns all behaviors attached to this component.
|
|
* @return Behavior[] list of behaviors attached to this component
|
|
*/
|
|
public function getBehaviors()
|
|
{
|
|
$this->ensureBehaviors();
|
|
return $this->_behaviors;
|
|
}
|
|
|
|
/**
|
|
* Attaches a behavior to this component.
|
|
* This method will create the behavior object based on the given
|
|
* configuration. After that, the behavior object will be attached to
|
|
* this component by calling the [[Behavior::attach()]] method.
|
|
* @param string $name the name of the behavior.
|
|
* @param string|array|Behavior $behavior the behavior configuration. This can be one of the following:
|
|
*
|
|
* - a [[Behavior]] object
|
|
* - a string specifying the behavior class
|
|
* - an object configuration array that will be passed to [[Yii::createObject()]] to create the behavior object.
|
|
*
|
|
* @return Behavior the behavior object
|
|
* @see detachBehavior()
|
|
*/
|
|
public function attachBehavior($name, $behavior)
|
|
{
|
|
$this->ensureBehaviors();
|
|
return $this->attachBehaviorInternal($name, $behavior);
|
|
}
|
|
|
|
/**
|
|
* Attaches a list of behaviors to the component.
|
|
* Each behavior is indexed by its name and should be a [[Behavior]] object,
|
|
* a string specifying the behavior class, or an configuration array for creating the behavior.
|
|
* @param array $behaviors list of behaviors to be attached to the component
|
|
* @see attachBehavior()
|
|
*/
|
|
public function attachBehaviors($behaviors)
|
|
{
|
|
$this->ensureBehaviors();
|
|
foreach ($behaviors as $name => $behavior) {
|
|
$this->attachBehaviorInternal($name, $behavior);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Detaches a behavior from the component.
|
|
* The behavior's [[Behavior::detach()]] method will be invoked.
|
|
* @param string $name the behavior's name.
|
|
* @return Behavior|null the detached behavior. Null if the behavior does not exist.
|
|
*/
|
|
public function detachBehavior($name)
|
|
{
|
|
$this->ensureBehaviors();
|
|
if (isset($this->_behaviors[$name])) {
|
|
$behavior = $this->_behaviors[$name];
|
|
unset($this->_behaviors[$name]);
|
|
$behavior->detach();
|
|
return $behavior;
|
|
}
|
|
|
|
return null;
|
|
}
|
|
|
|
/**
|
|
* Detaches all behaviors from the component.
|
|
*/
|
|
public function detachBehaviors()
|
|
{
|
|
$this->ensureBehaviors();
|
|
foreach ($this->_behaviors as $name => $behavior) {
|
|
$this->detachBehavior($name);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Makes sure that the behaviors declared in [[behaviors()]] are attached to this component.
|
|
*/
|
|
public function ensureBehaviors()
|
|
{
|
|
if ($this->_behaviors === null) {
|
|
$this->_behaviors = [];
|
|
foreach ($this->behaviors() as $name => $behavior) {
|
|
$this->attachBehaviorInternal($name, $behavior);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Attaches a behavior to this component.
|
|
* @param string|int $name the name of the behavior. If this is an integer, it means the behavior
|
|
* is an anonymous one. Otherwise, the behavior is a named one and any existing behavior with the same name
|
|
* will be detached first.
|
|
* @param string|array|Behavior $behavior the behavior to be attached
|
|
* @return Behavior the attached behavior.
|
|
*/
|
|
private function attachBehaviorInternal($name, $behavior)
|
|
{
|
|
if (!($behavior instanceof Behavior)) {
|
|
$behavior = Yii::createObject($behavior);
|
|
}
|
|
if (is_int($name)) {
|
|
$behavior->attach($this);
|
|
$this->_behaviors[] = $behavior;
|
|
} else {
|
|
if (isset($this->_behaviors[$name])) {
|
|
$this->_behaviors[$name]->detach();
|
|
}
|
|
$behavior->attach($this);
|
|
$this->_behaviors[$name] = $behavior;
|
|
}
|
|
|
|
return $behavior;
|
|
}
|
|
}
|