No one? :s
Le lundi 22 septembre 2014 13:51:34 UTC+2, Daniel Gillet a écrit :
>
> Hello,
>
> I was wondering what would be a good way to have a Label showing the
> content of a variable, and updating automatically when the variable
> changes. I made something like this but I would love to hear if you have
> something better for me.
>
> import cocos
> from cocos.director import director
>
> import pyglet
>
> class Observable(pyglet.event.EventDispatcher):
> """
> A value that will fire an on_change event when its value
> is changed.
> """
>
> _value = 0
>
> def __init__(self, value, *args, **kwargs):
> super(Observable, self).__init__(*args, **kwargs)
> self.value = value
>
> def _set_value(self, new_value):
> self._value = new_value
> self.dispatch_event("on_change", self.value)
>
> value = property(lambda self: self._value, _set_value)
>
> Observable.register_event_type("on_change")
>
> class TestLayer(cocos.layer.Layer):
> """
> The layer containing the timer
> """
> def __init__(self):
> super( TestLayer, self ).__init__()
>
> self.timer = Observable(0)
>
> @self.timer.event
> def on_change(timer):
> self.timer_label.element.text = "Time: {}s".format(timer)
>
> self.timer_label = cocos.text.Label("Time:
> {}s".format(self.timer.value),
> position=(100, 100),
> font_size=20)
> self.add(self.timer_label)
>
> self.schedule_interval(self.increase_timer, 1)
>
> def increase_timer(self, dt):
> self.timer.value += 1
>
> if __name__ == "__main__":
> # director init takes the same arguments as pyglet.window
> director.init(width=800, height=600, do_not_scale=True)
> director.run( cocos.scene.Scene( TestLayer() ) )
>
> What I don't like too much with this method is that I have to reference
> the timer.value to manipulate my variable, instead of having just a timer
> variable.
>
> Another solution I had, inspired by CocosNode make_property function was
> to create properties with the setter calling a callback.
>
>
> import cocos
> from cocos.director import director
>
> import pyglet
>
> class TestLayer(cocos.layer.Layer):
> """
> The layer containing the timer
> """
> def __init__(self):
> super( TestLayer, self ).__init__()
> self.timer_label = cocos.text.Label("Time: 0s", # Problem, I
> cannot yet reference self.timer
> position=(100, 100),
> font_size=20)
> self.add(self.timer_label)
> self.timer = 0 # Problem: if I set this before creating the label,
> on_timer is called and self.timer_label does not yet exist
>
> self.schedule_interval(self.increase_timer, 1)
>
> def increase_timer(self, dt):
> self.timer += 1
>
> def on_timer(self, value):
> self.timer_label.element.text = "Time: {}s".format(value)
>
> def make_property(attr):
> def set_attr():
> def inner(self, value):
> setattr(self, "_"+attr, value)
> #Call the function on_attributename passing the new value
> as arg.
> getattr(self, "on_" + attr)(value)
> return inner
> def get_attr():
> def inner(self):
> return getattr(self, "_"+attr)
> return inner
> return property(
> get_attr(),
> set_attr())
> timer = make_property("timer")
>
>
> if __name__ == "__main__":
> # director init takes the same arguments as pyglet.window
> director.init(width=800, height=600, do_not_scale=True)
> director.run( cocos.scene.Scene( TestLayer() ) )
>
> As I wrote in the code, this leads some problem of setting first the timer
> property or creating first the label.
>
> Thanks for your comments and suggestions!
>
> Dan.
>
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