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+.. currentmodule:: PySide6.QtDesigner
+.. py:class:: QPyDesignerCustomWidgetCollection
+
+Synopsis
+--------
+
+Functions
+^^^^^^^^^
+
++------------------------------------------------------------------------------------------------+
+|def :meth:`registerCustomWidget<QPyDesignerCustomWidgetCollection.registerCustomWidget>` (type) |
++------------------------------------------------------------------------------------------------+
+|def :meth:`addCustomWidget<QPyDesignerCustomWidgetCollection.addCustomWidget>` (custom_widget)  |
++------------------------------------------------------------------------------------------------+
+
+Detailed Description
+--------------------
+
+The :class:`~.QPyDesignerCustomWidgetCollection` implements
+`QDesignerCustomWidgetCollectionInterface <https://doc.qt.io/qt-6/qdesignercustomwidgetcollectioninterface.html>`_
+and provides static helper functions for registering custom widgets by
+type or by implementing
+`QDesignerCustomWidgetInterface`_ .
+
+The usage is explained in :ref:`designer_custom_widgets`.
+
+.. py:staticmethod:: QPyDesignerCustomWidgetCollection.registerCustomWidget(type[, xml=""[, tool_tip=""[, icon=""[, group=""[container=False]]]]])
+
+   Registers an instance of a Python-implemented QWidget by type with
+   *Qt Widgets Designer*.
+
+   The optional keyword arguments correspond to the getters of
+   `QDesignerCustomWidgetInterface`_ :
+
+   :param str xml: A snippet of XML code in ``.ui`` format that specifies how the widget is created and sets initial property values.
+   :param str tool_tip: Tool tip to be shown in the widget box.
+   :param str icon: Path to an icon file be shown in the widget box.
+   :param str group: Category for grouping widgets in the widget box.
+   :param str module: Module name for generating the import code by `uic <https://doc.qt.io/qt-6/uic.html>`_ .
+   :param bool container: Indicates whether the widget is a container like `QGroupBox`, that is, child widgets can be placed on it.
+
+   .. seealso::  :meth:`registerCustomWidget()<PySide6.QtUiTools.QUiLoader.registerCustomWidget>`
+
+.. py:staticmethod:: QPyDesignerCustomWidgetCollection.addCustomWidget(custom_widget)
+
+    Adds a custom widget (implementation of
+    `QDesignerCustomWidgetInterface`_)
+    with *Qt Widgets Designer*.
+
+   :param QDesignerCustomWidgetInterface custom_widget: Custom widget instance
+
+.. _QDesignerCustomWidgetInterface: https://doc.qt.io/qt-6/qdesignercustomwidgetinterface.html