Apple Newton Utilities Guide de l'utilisateur télécharger pdf (Page 143)

100

101

CHAPTER 4

NewtApp Applications

About the NewtApp Framework 4-5

About newtSoup 4

Application data is stored in persistent structures known as soups in any Newton

application. In a NewtApp application, soup deﬁnitions, written in the

newtApplication.allSoups slot, must be based on the newtSoup proto.

Within a soup, data is stored in frames known as entries. In turn, entries contain the

individual slots in which you store your application’s data. The data in these slots is

accessed by using a programming construct known as a cursor.

The

newtSoup proto deﬁnes its own version of a set of the data storage objects

and methods. If you are not already familiar with these concepts and objects, you

should read the introductory parts of Chapter 11, “Data Storage and Retrieval,”

before trying to use the

newtSoup proto.

The Layout Protos 4

Each NewtApp application must have two basic views of the application data,

known as layouts, which are:

■ an overview—seen when the Overview button is tapped

■ a default view—seen when the application is ﬁrst opened

Three kinds of layouts correspond to three basic application styles:

■ the card (see newtLayout)

■ the continuous roll (see newtRollLayout)

■ the page (see newtPageLayout)

Card-based and roll-based applications differ in the number of entries each may

have visible at one time. The built-in Names application is a card-based application.

For this type of application, only one entry is displayed at a time. In contrast, the

built-in Notes application, which is a roll-based application, can have multiple

entries visible at once. They must be separated by a header, that incorporates Action

and Filing buttons to make it obvious to which entry a button action should apply.

Examples of card-based and a roll-based applications are shown in Figure 4-2.

1 2 ... 138 139 140 141 142 143 144 145 146 147 148 ... 941 942

Commentaires sur ces manuels

Pas de commentaire

Apple Newton Utilities Guide de l'utilisateur Page 143

Commentaires sur ces manuels

Produits connexes et manuels pour Logiciel Apple Newton Utilities