Apple Newton Utilities Uživatelská příručka stáhnout pdf (Strana 823)

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CHAPTER 22

Transport Interface

Using the Transport Interface 22-35

For example, the built-in Print transport uses the protoTransportPrefs proto

for its preferences view. Since the

ReceiveRequest method does not exist in

the Print transport, the In Box preference element is not displayed, as shown in

Figure 22-10.

Figure 22-10 Print preferences

The Info button is included in the protoTransportPrefs template so you can

give the user access to About and Help views for the transport. The button is built

from the standard

protoInfoButton proto. To include items on the Info picker,

you must provide handler methods in the

infoPrefs slot of your transport

preferences view. The

protoTransportPrefs template includes a handler for

the “Help” item that displays the system help book, open to the routing section.

You’ll need to override this method if you want to provide your own help information.

You can add custom items to the Info picker by supplying

GenInfoAuxItems

and

DoInfoAux methods in the infoPrefs frame. For more information about

these methods and how the Info button works, see “protoInfoButton” (page 6-10)

in Newton Programmer’s Reference.

The

defaultConfiguration slot in the protoTransport holds the initial

preferences associated with the transport. This slot is set up by default with a frame

holding an initial selection of preferences items. The child views of the

protoTransportPrefs proto are designed to manipulate the slots in this frame.

If you want to override the default preferences frame, you need to construct an

identical one with different values. You can’t use a

_proto slot in your default

frame since the contents of the

defaultConfiguration slot are stored in a

soup and

_proto slots can’t be stored in soup entries.

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