Section 3

We will use the same subclasses technique to further subdivide the "inside" click region into 4 regions. One new sub-region for each of the push directions of North, East, South and West. Here's our new hierarchy.

Implementation of the selecting method and the corresponding methods on the sub-classes is straight-forward. Note that we have no concerns here about prioritization.

For now, implement a useless ^true response to the #containsPoint: message in each of the push subclasses. All of the methods in the region subclasses have been class methods so far.

We'll work out details in the next section.

Index Page Next Page

Copyright © 2007, 2008, 2009, 2010 Stephan B Wessels