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C H A P T E R 1
Communications Services
If you want to allow the user to search for data stored by your application, you
need to implement certain methods that respond to find messages sent by the
system. You'll need to supply one method that searches your application's soup(s)
for data and returns the results in a particular format, and another method that
locates and displays the found data in your application if the user taps on it in the
find overview. The system software includes routines and templates that help you
support find in your application. For details on supporting the Find service, refer to
Chapter 16, "Find."
The Filing service allows users to tag soup-based data in your application with
labels used to store, retrieve, and display the data by category. The labels used to
tag entries are represented as folders in the user interface; however, no true
hierarchical filing exists--the tagged entries still reside in the soup. Users access
the filing service through a standard user interface element called the file folder
button, which looks like a small file folder.
When the user chooses a category for an item, the system notifies your application
that filing has changed. Your application must perform the appropriate application-
specific tasks and redraw the current view, providing to the user the illusion that the
item has been placed in a folder. When the user chooses to display data from a
category other than the currently displayed one, the system also notifies your
application, which must retrieve and display data in the selected category.
The system software includes templates that help your application implement the
filing button and the selector that allows the user to choose which category of data
to display. Your application must provide methods that respond to filing messages
sent by the system in response to user actions such as filing an item, changing the
category of items to display, and changing the list of filing categories. For details
on supporting the Filing service, refer to Chapter 15, "Filing."
Communications Services
This section provides an overview of the communications services in Newton
system software 2.0.
The Newton communications architecture is application-oriented, rather than
protocol-oriented. This means that you can focus your programming efforts on
what your application needs to do, rather than on communication protocol details.
A simple high-level NewtonScript interface encapsulates all protocol details, which
are handled in the same way regardless of which communication transport tool you
are using.
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