pyjon.events 1.2

这是什么？

events是对象的一个易于使用的事件分派器元类： 只需将其添加到任何类中，就可以添加事件侦听器和分派事件。

添加侦听器时，可以定义传递给侦听器的参数。 您还可以定义在发出事件时传递给侦听器的参数。

示例

在我们的例子中，我们将定义一个person类。 只需导入模块，并将其添加到类中（python2示例）：

from pyjon.events import EventDispatcher

class Person(object):
    __metaclass__ = EventDispatcher

    def __init__(self, name):
        # just a sample initialization, you can do whatever you want, of course.
        self.name = name

    def run(self, meters=1):
        print "I'm running for %d meters !" % meters
        self.emit_event('ran', meters)
        self.emit_event('moved', meters=meters)

    def walk(self, meters=1):
        print "I'm walking for %d meters !" % meters
        self.emit_event('walked', meters)
        self.emit_event('moved', meters=meters)

    def sleep(self):
        print "sleeping..."
        self.emit_event('sleeping')
        time.sleep(5)
        self.emit_event('sleeped')
        print "Wow... had a good night !"

对于python3，只需替换这个：

class Person(object):
    __metaclass__ = EventDispatcher

用这个：

class Person(metaclass = EventDispatcher):

现在，让我们实例化我们的类并订阅事件：

>>> henry = Person('henry')

>>> def handle_movement(meters=None):
...     print "he moved for %d meters" % meters

>>> def handle_person_movement(who, meters=None):
...     print "%s moved for %d meters" % (who, meters)

>>> henry.add_listener('moved', handle_movement)

>>> henry.add_listener('moved', handle_person_movement, "henry")

>>> henry.walk(5)
I'm walking for 5 meters !
he moved for 5 meters
henry moved for 5 meters

>>> def handle_advanced_movement(meters, who, movement_type):
...     print "%s %s for %d meters" % (who, movement_type, meters)

>>> henry.add_listener('walked', handle_advanced_movement, "henry", "walked")

>>> henry.add_listener('ran', handle_advanced_movement, "henry", "ran")

>>> henry.walk(5)
I'm walking for 5 meters !
henry walked for 5 meters
he moved for 5 meters
henry moved for 5 meters

>>> henry.run(5)
I'm running for 5 meters !
henry ran for 5 meters
he moved for 5 meters
henry moved for 5 meters

很简单，不是吗？

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