Component理解

来源：互联网发布：qq酷双项淘宝客编辑：程序博客网时间：2024/06/05 07:21

以下是Component小demo。

<?phpclass Event {    public $name;    public $data;}abstract class Component {    private static $_events = [];     public function on($name, $handler, $data = null) {        self::$_events[$name][] = [$handler, $data];    }       public function trigger($name) {        $event = new Event;$event->name = $name;        foreach (self::$_events[$name] as $handler) {    // 构造event            $event->data = $handler[1];            call_user_func($handler[0], $event);        }       }   }class Person extends Component {    const EVENT_HELLO = 0;    public function hello($event) {        echo "hello: ".$event->data."\n";    }}$myComponent = new Person();$myComponent->on(Person::EVENT_HELLO, [$myComponent, 'hello'], " lee");$myComponent->trigger(Person::EVENT_HELLO);

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在trigger的时候，动态绑定一个数据。

<?phpclass Event {    public $name;    public $data;}abstract class Component {    private static $_events = [];     public function on($name, $handler, $data = null) {        self::$_events[$name][] = [$handler, $data];    }       public function trigger($name, $event = null) {        if ($event === null) {    public $data;}abstract class Component {    private static $_events = [];    public function on($name, $handler, $data = null) {        self::$_events[$name][] = [$handler, $data];    }    public function trigger($name, $event = null) {        if (!empty(self::$_events[$name])) {            if ($event === null) {                $event = new static;<?phpclass Event {    public $name;    public $data;}abstract class Component {    private static $_events = [];    public function on($name, $handler, $data = null) {        self::$_events[$name][] = [$handler, $data];    }    public function trigger($name, $event = null) {        if (!empty(self::$_events[$name])) {            if ($event === null) {                $event = new static;            }            $event->name = $name;            foreach (self::$_events[$name] as $handler) {                $event->data = $handler[1];                call_user_func($handler[0], $event);            }        }    }   }class Person extends Component {    const EVENT_HELLO = 0;    public function hello($event) {        echo "hello: ".$event->data."\n";        echo "publicTime: ".$event->publicTime."\n";    }}$myComponent = new Person();$publicEvent = new Event;$publicEvent->publicTime = '2016-05-21 14:39:05';$myComponent->on(Person::EVENT_HELLO, [$myComponent, 'hello'], " lee");$myComponent->trigger(Person::EVENT_HELLO, $publicEvent);

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在event添加是否handled字段，如果设定为handled=true, 则不继续处理。

<?phpclass Event {    public $name;    public $data;    public $handled;}abstract class Component {    private static $_events = [];    public function on($name, $handler, $data = null) {        self::$_events[$name][] = [$handler, $data];    }    public function trigger($name, $event = null) {        if (!empty(self::$_events[$name])) {            if ($event === null) {class Event {    public $name;    public $data;    public $handled;}abstract class Component {    private static $_events = [];    public function on($name, $handler, $data = null) {        self::$_events[$name][] = [$handler, $data];    }    public function trigger($name, $event = null) {        if (!empty(self::$_events[$name])) {            if ($event === null) {                $event = new static;            }            $event->name = $name;            $event->handled = false; // 设置时间未处理            foreach (self::$_events[$name] as $handler) {                $event->data = $handler[1];                call_user_func($handler[0], $event);                if ($event->handled) { // 如果handler 设置handled为true，表示不继续处理下去                    return;                }                      }        }    }}class Person extends Component {    const EVENT_HELLO = 0;    public function hello($event) {        echo "hello: ".$event->data."\n";        echo "publicTime: ".$event->publicTime."\n";        // 设置不继续处理下去        $event->handled = true;    }          }              $myComponent = new Person();$publicEvent = new Event;$publicEvent->publicTime = '2016-05-21 14:39:05';$myComponent->on(Person::EVENT_HELLO, [$myComponent, 'hello'], " lee");$myComponent->trigger(Person::EVENT_HELLO, $publicEvent);

################

class-level event

类级别事件，不是由某个类的实例来注册，而是由类来注册，这样，所有类的实例都能够处理这个事件。

<?phpclass Event {    public $name;    public $data;    public $handled;    // global class-level Events    private static $_events = [];    // 归属于那个类    public static function on($class, $name, $handler, $data = null) {        $class = ltrim($class, '\\');        if (empty(self::$_events[$name])) {    self::$_events[$name][$class][] = [$handler, $data];        } else {            array_unshift(self::$_events[$name][$class], [$handler, $data]);        }    }    public static function trigger($class, $name, $event = null) {        if (empty(self::$_events[$name])) {            return;        }        if ($event === null) {            $event = new static;        }        $event->name = $name;        $event->handled = false;        if (is_object($class)) {            $class = get_class($class);        } else {            $class = ltrim($class, '\\');        }        // 获取所有父类，子类，当前类        $classes = array_merge(            [$class],            class_parents($class, true),            class_implements($class, true)        );        foreach ($classes as $class) {            if (!empty(self::$_events[$name][$class])) {                foreach (self::$_events[$name][$class] as $handler) {                    $event->data = $handler[1];                    call_user_func($handler[0], $event);                    if ($event->handled) {                        return;                    }                }            }        }    }}abstract class Component {private static $_events = [];public function on($name, $handler, $data = null) {self::$_events[$name][] = [$handler, $data];}    public function trigger($name, $event = null) {        if (!empty(self::$_events[$name])) {            if ($event === null) {                $event = new static;            }            $event->name = $name;            $event->handled = false;            foreach (self::$_events[$name] as $handler) {                $event->data = $handler[1];                call_user_func($handler[0], $event);                if ($event->handled) {                    return;                }            }        }        // 是否有类全局事件处理        Event::trigger($this, $name, $event);    }}class Person extends Component {    const EVENT_HELLO = 0;    public static function hello($event) {        echo "hello: ".$event->data."\n";        echo "publicTime: ".$event->publicTime."\n";        $event->handled = true;    }}Event::on('Person', Person::EVENT_HELLO, ['Person', 'hello'], " lee");$myComponent = new Person();$publicEvent = new Event;$publicEvent->publicTime = '2016-05-21 14:39:05';$myComponent->trigger(Person::EVENT_HELLO, $publicEvent);

只需要全局注册一个事件，类的实例都可以使用这个事件了。

其他细节，如off等，参考yii的源码

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