Having a separate controller class makes it easy to add more interfaces, for instance a macro-language. While this is quite an advanced topic, and one that merits a chapter in itself (see Chapter 20), you can see for yourself how powerful the current separation is. You can easily create a completely separate script that creates a document and modifies it:
Example 12-2. Scripting an application is easy
#
# Scripting a docview application
#
from docviewdoc import DocviewDoc
doc=DocviewDoc()
doc.slotModify()
You can handle your application's data not only through a GUI interface, but also with scripts. Possible extensions would be to expose the DocviewDoc functionality through interfaces like CORBA, DCOM, DCOP or SOAP - all very feasible, since Python modules to create these interfaces are readily available. Note however that only CORBA and SOAP are platform independent: DCOM ties you to Windows and DCOP to KDE. Integrating a macro extension in the application is covered in Chapter 20