/addons/EventDelegate.py

from __pyjamas__ import JS



class EventDelegate:

   """

      Create the equivalent of a bound method.  This also prepends extra 

      args, if any, to the called method's argument list when it calls it.

      

      Pass the method name you want to implement (javascript doesn't

      support callables).

      

      @type args: list

      @param args: If given, the arguments will be prepended to the 

                   arguments passed to the event callback

   """

   def __init__(self, eventMethodName, obj, method, *args):      

      self.obj = obj

      self.method = method

      self.args = args

      JS("this[eventMethodName] = this.onEvent;")



   def onEvent(self, *args):

      self.method.apply(self.obj, self.args.l.concat(args.l))