from zope.interface import Attribute
from zope.interface import Interface


class IPloneControlPanelView(Interface):
    """A marker interface for views showing a controlpanel.
    """


class IPloneControlPanelForm(IPloneControlPanelView):
    """Forms using plone.app.controlpanel
    """

    def _on_save():
        """Callback mehod which can be implemented by control panels to
        react when the form is successfully saved. This avoids the need
        to re-define actions only to do some additional notification or
        configuration which cannot be handled by the normal schema adapter.

        By default, does nothing.
        """


class IConfigurationChangedEvent(Interface):
    """An event which is fired after a configuration setting has been changed.
    """

    context = Attribute("The configuration context which was changed.")

    data = Attribute("The configuration data which was changed.")