# coding: utf-8
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__authors__ = ["H. Payno", ]
__license__ = "MIT"
__date__ = "26/10/2018"

from Orange.widgets import settings


class CallbackSettingsHandler(settings.SettingsHandler):
    """
    Settings handler used to call some callback before packing data (so before)
    saving orange :class:`Setting`
    """
    def __init__(self):
        super(CallbackSettingsHandler, self).__init__()
        self.__callbacks = []

    def addCallback(self, _callback):
        self.__callbacks.append(_callback)
    
    def pack_data(self, widget):
        for callback in self.__callbacks:
            callback()
        return super(CallbackSettingsHandler, self).pack_data(widget)
