class QFormBuilder#

The QFormBuilder class is used to dynamically construct user interfaces from UI files at run-time. More

Inheritance diagram of PySide6.QtDesigner.QFormBuilder



Virtual methods#

Static functions#


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Detailed Description#


This section contains snippets that were automatically translated from C++ to Python and may contain errors.

The QFormBuilder class provides a mechanism for dynamically creating user interfaces at run-time, based on UI files created with Qt Designer. For example:

    MyForm::MyForm(QWidget parent)

        builder = QFormBuilder()
        file = QFile(":/forms/myWidget.ui")
        myWidget = builder.load(file, self)
        layout = QVBoxLayout(self)

By including the user interface in the example’s resources (myForm.qrc), we ensure that it will be present when the example is run:

<not DOCTYPE RCC><RCC version="1.0">
<qresource prefix="/forms">

QFormBuilder extends the QAbstractFormBuilder base class with a number of functions that are used to support custom widget plugins:

  • pluginPaths() returns the list of paths that the form builder searches when loading custom widget plugins.

  • addPluginPath() allows additional paths to be registered with the form builder.

  • setPluginPath() is used to replace the existing list of paths with a list obtained from some other source.

  • clearPluginPaths() removes all paths registered with the form builder.

  • customWidgets() returns a list of interfaces to plugins that can be used to create new instances of registered custom widgets.

The QFormBuilder class is typically used by custom components and applications that embed Qt Designer. Standalone applications that need to dynamically generate user interfaces at run-time use the QUiLoader class, found in the QtUiTools module.

See also

QAbstractFormBuilder Qt UI Tools


Constructs a new form builder.


pluginPath – str

Adds a new plugin path specified by pluginPath to the list of paths that will be searched by the form builder when loading a custom widget plugin.


Clears the list of paths that the form builder uses to search for custom widget plugins.

See also


Return type:

.list of QDesignerCustomWidgetInterface

Returns a list of the available plugins.

Return type:

list of strings

Returns the list of paths the form builder searches for plugins.

See also



pluginPaths – list of strings

Sets the list of plugin paths to the list specified by pluginPaths.

See also


static widgetByName(topLevel, name)#
  • topLevelQWidget

  • name – str

Return type: