MiG InfoCom MiG Calendar AShape Developer Manual - Manual (Page 7)

MiG InfoCom AB
AShape Structural Overview
The Basics
To understand how this component works you must have an
understanding on both the class hierarchy, which is really
simple, and the tree like structure the objects are stored in
when they are created. It is important to understand the
distinction between class inheritance and tree structure the
objects are ordered in.
Class Hierarchy
As you can see the class hierarchy is simple to understand,
yet very powerful. The objects should almost exclusively be
handled by their interface type
AShape . This ensures that
the implementation can be exchanged at any time, say of
you want to exchange the
TextAShape for your own
implementation at a later time.
AbstractAShape adds a lot of boiler plate functionality for
the sub classes. It implements almost everything from the
AShape interface and a lot more. This includes:
• Property handling with override support (explained below)
• Layout and paint cycle management
AShape Developer Manual Page 7 / 24