Apple Newton Utilities Guide de l'utilisateur télécharger pdf (Page 59)

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CHAPTER 1

Overview

Communications Services 1-11

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.”

Filing 1

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 1

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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Apple Newton Utilities Guide de l'utilisateur Page 59

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