Whether the layout is active and responsive to user input.
ReadonlyisWhether this object references a valid layout.
Distance between widgets in the layout.
Remove all widgets from the layout with specified cleanup behavior.
Schedule layout for deletion after event processing.
Returns the name of this object's type.
Returns true if the object is of the specified type.
Returns true if this object refers to the same instance as the given object.
Set the margins around layout contents.
Base class for layout managers.