:right-sidebar: True

CustomLayout
===================================================================

.. currentmodule:: gi.repository.Gtk





.. class:: CustomLayout(**properties: ~typing.Any)
   :no-contents-entry:


Superclasses: :class:`~gi.repository.Gtk.LayoutManager`, :class:`~gi.repository.GObject.Object`





``GtkCustomLayout`` uses closures for size negotiation.

A `GtkCustomLayout `uses closures matching to the old ``GtkWidget``
virtual functions for size negotiation, as a convenience API to
ease the porting towards the corresponding `GtkLayoutManager
virtual functions.



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

.. rst-class:: interim-class

.. class:: CustomLayout
   :no-index:


   .. classmethod:: new(request_mode: ~typing.Callable[[~gi.repository.Gtk.Widget], ~gi.repository.Gtk.SizeRequestMode] | None, measure: ~typing.Callable[[~gi.repository.Gtk.Widget, ~gi.repository.Gtk.Orientation, int], tuple[int, int, int, int]], allocate: ~typing.Callable[[~gi.repository.Gtk.Widget, int, int, int], None]) -> ~gi.repository.Gtk.LayoutManager

      Creates a new legacy layout manager.

      Legacy layout managers map to the old ``GtkWidget`` size negotiation
      virtual functions, and are meant to be used during the transition
      from layout containers to layout manager delegates.







      :param request_mode: a function to retrieve
         the ``GtkSizeRequestMode`` of the widget using the layout; the
         default request mode is :const:`~gi.repository.Gtk.SizeRequestMode.CONSTANT_SIZE`


      :param measure: a function to measure the widget using the layout manager


      :param allocate: a function to allocate the children of the widget using
         the layout manager