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CClosureExpression
===================================================================

.. currentmodule:: gi.repository.Gtk





.. class:: CClosureExpression(*args, **kwargs)
   :no-contents-entry:


Superclasses: :class:`~gi.repository.Gtk.Expression`





A variant of ``GtkClosureExpression`` using a C closure.


Constructors
------------

.. rst-class:: interim-class

.. class:: CClosureExpression
   :no-index:


   .. classmethod:: new(value_type: ~gobject.GType, marshal: ~typing.Callable[[~gi.repository.GObject.Closure, ~gi.repository.GObject.Value | None, list[~gi.repository.GObject.Value], ~typing.Any, ~typing.Any], None] | None, params: list[~gi.repository.Gtk.Expression], callback_func: ~typing.Callable[[], None], user_data: ~typing.Any = None) -> ~gi.repository.Gtk.CClosureExpression

      Creates a ``GtkExpression`` that calls ``callback_func`` when it is evaluated.

      This function is a variant of :obj:`~gi.repository.Gtk.ClosureExpression.new` that
      creates a ``GClosure`` by calling :func:`~gi.repository.GObject.CClosure.new` with the given
      ``callback_func``\, ``user_data`` and ``user_destroy``\.






      :param value_type: the type of the value that this expression evaluates to

      :param marshal: marshaller used for creating a closure

      :param params: expressions for each parameter

      :param callback_func: callback used for creating a closure

      :param user_data: user data used for creating a closure