Apple Newton Utilities Guide de l'utilisateur télécharger pdf (Page 753)

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CHAPTER 21

Routing Interface

About Routing 21-5

3. Using the list of formats, the system builds a list of transports that can handle at

least one of the data types supported by any of the formats. The matching

transports are shown on the Action picker. Application-deﬁned actions such as

delete or duplicate are also added to the picker.

4. If the user chooses a transport-based action from the picker, the system sends

the

SetupItem message to the current (last-used) format for that transport and

the data type being routed. Then the routing slip is opened, where the user can

supply addressing information and conﬁrm the routing action. If the user

switches formats from among those available, the

SetupItem message is sent

to the new format.

5. If the user chooses an application-deﬁned action from the picker, the system

sends the Action button view the message deﬁned by the application for that

action (in the

RouteScript slot of the routeScripts frame).

The following section describes routing formats in more detail and explains how

they’re used to determine what transport-based routing actions appear on the

Action picker. The steps in this summary are explained in greater detail in the

section “Providing Transport-Based Routing Actions” beginning on page 21-9.

Routing Formats 21

To implement the sending of data using the Routing interface and a transport, an

application uses one or more routing formats that specify how data is to be formatted

when it is routed. A routing format is a frame specifying items such as the title of

the format, a unique identifying symbol, the type of data the format handles, and

other information controlling how the data is handled. Some types of routing

formats, such as print formats, are view templates that contain child views that lay

out the data being printed. Other types of routing formats, such as frame formats,

simply control how a frame of data is sent; these have no visual representation.

Here is an example of a routing format frame:

{_proto: protoPrintFormat,// based on this proto

title: "Two-column", // name of format

symbol: '|twoColumnFormat:SIG|, // format id

// construct child views that do the actual layout

ViewSetupChildrenScript: func() begin ... end,

// handle multiple pages

PrintNextPageScript: func() begin ... end,

...}

The dataTypes slot in the format indicates the types of data handled by the

format. This slot and the class of the data object being routed are used to determine

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