Activation zones and masking
Add a feature for defining zones. These zones would be defined by masks, images in negative format. Each handle would be mapped to a mask. When dropping or moving the widget would need to check whether the handle needs to be masked.
If so then a flag should be set and the flag could be queried to resolve whether the widget should adopt a behaviour or not. Lifts should always disable the flag.
This might be able to be added to the BaseWidget.