Item, FieldGroup and Everything

I want to study the roles of the the following components and find a reasonably sound structure for the UI

• Item
• FieldGroup

Item

Item holds Properties and passes data between data source (a bean, for example) and the UI

FieldGroup

• easy way of binding
  • through the "build" and "buildAndBind" methods
• easy way of handling all fields at once:
  • enable / disable
  • set read only
  • isValid
• commit
  • cache changes
  • commit()
  • discard()
• Item : used as data source (set/get)
• FieldGroupFieldFactory: field factory (set / get)

FieldGroupFieldFactory

Responsible for creating fields based on data to be edited

My UI Structure:

Form:

• custom component
• decides where to place the fields and other UI features
• binds to an item (new or edit)
• optionally is given a field group
• provide buttons
• commit / discard fieldgroup