12    -    QtDesigner模块提供类来创建自制风格的窗口部件，还提供访问Qt Designer组件的类

    QAbstractExtensionFactory    -    Interface for extension factories in Qt Designer

    QAbstractExtensionManager    -    Interface for extension managers in Qt Designer

    QAbstractFormBuilder    -    Default implementation for classes that create user interfaces at run-time

    QDesignerActionEditorInterface    -    Allows you to change the focus of Qt Designer's action editor

    QDesignerContainerExtension    -    Allows you to add pages to a custom multi-page container in Qt Designer's workspace

    QDesignerCustomWidgetCollectionInterface    -    Allows you to include several custom widgets in one single library

    QDesignerCustomWidgetInterface    -    Enables Qt Designer to access and construct custom widgets

    QDesignerDynamicPropertySheetExtension    -    Allows you to manipulate a widget's dynamic properties in Qt Designer's property editor

    QDesignerFormEditorInterface    -    Allows you to access Qt Designer's various components

    QDesignerFormWindowCursorInterface    -    Allows you to query and modify a form window's widget selection, and in addition modify the properties of all the form's widgets

    QDesignerFormWindowInterface    -    Allows you to query and manipulate form windows appearing in Qt Designer's workspace

    QDesignerFormWindowManagerInterface    -    Allows you to manipulate the collection of form windows in Qt Designer, and control Qt Designer's form editing actions

    QDesignerMemberSheetExtension    -    Allows you to manipulate a widget's member functions which is displayed when configuring connections using Qt Designer's mode for editing signals and slots

    QDesignerObjectInspectorInterface    -    Allows you to change the focus of Qt Designer's object inspector

    QDesignerPropertyEditorInterface    -    Allows you to query and manipulate the current state of Qt Designer's property editor

    QDesignerPropertySheetExtension    -    Allows you to manipulate a widget's properties which is displayed in Qt Designer's property editor

    QDesignerTaskMenuExtension    -    Allows you to add custom menu entries to Qt Designer's task menu

    QDesignerWidgetBoxInterface    -    Allows you to control the contents of Qt Designer's widget box

    QExtensionFactory    -    Allows you to create a factory that is able to make instances of custom extensions in Qt Designer

    QExtensionManager    -    Extension management facilities for Qt Designer

    QFormBuilder    -    Used to dynamically construct user interfaces from UI files at run-time