:right-sidebar: True

PropertyExpression
===================================================================

.. currentmodule:: gi.repository.Gtk





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


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





A ``GObject`` property value in a ``GtkExpression``.



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

.. rst-class:: interim-class

.. class:: PropertyExpression
   :no-index:


   .. classmethod:: new(this_type: type, expression: ~gi.repository.Gtk.Expression | None, property_name: str) -> ~gi.repository.Gtk.PropertyExpression

      Creates an expression that looks up a property.

      The object to use is found by evaluating the ``expression``,
      or using the ``this`` argument when ``expression`` is ``NULL``.

      If the resulting object conforms to ``this_type``, its property named
      ``property_name`` will be queried. Otherwise, this expression's
      evaluation will fail.

      The given ``this_type`` must have a property with ``property_name``.







      :param this_type: The type to expect for the this type


      :param expression: Expression to
         evaluate to get the object to query or ``NULL`` to
         query the ``this`` object


      :param property_name: name of the property





   .. classmethod:: new_for_pspec(expression: ~gi.repository.Gtk.Expression | None, pspec: ~gi.repository.GObject.ParamSpec) -> ~gi.repository.Gtk.PropertyExpression

      Creates an expression that looks up a property.

      The object to use is found by evaluating the ``expression``,
      or using the ``this`` argument when ``expression`` is ``NULL``.

      If the resulting object conforms to ``this_type``, its
      property specified by ``pspec`` will be queried.
      Otherwise, this expression's evaluation will fail.







      :param expression: Expression to
         evaluate to get the object to query or ``NULL`` to
         query the ``this`` object


      :param pspec: the ``GParamSpec`` for the property to query









Methods
-------

.. rst-class:: interim-class

.. class:: PropertyExpression
   :no-index:


   .. method:: get_expression() -> ~gi.repository.Gtk.Expression | None

      Gets the expression specifying the object of
      a property expression.










   .. method:: get_pspec() -> ~gi.repository.GObject.ParamSpec

      Gets the ``GParamSpec`` specifying the property of
      a property expression.