Apple Newton Utilities Betriebsanweisung PDF herunterladen (Seite 379)

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CHAPTER 10

Recognition: Advanced Topics

About Advanced Topics in Recognition 10-3

On the other hand, if the view does not supply a recConfig frame, the recognition

system builds one based on the set of view ﬂags enabled for that view, the contents

of its

dictionaries slot (if present) and any recognition-related user preferences

that may apply. Thus, every view that performs recognition is eventually associated

with a

recConfig frame that the system uses to perform setup tasks when the

view is opened.

Note that the

recConfig frame actually used to conﬁgure recognition is the one

that the system builds, not the one that you supply. The

recConfig frame that

you supply is referenced by the

_proto slot of the recConfig frame that the

system builds.

The

recConfig frame built by the system is passed to a recognition area, which is

an object used internally by the system to describe the recognition characteristics

of one or more views. Because similar views can share an area, the use of

recognition areas minimizes the reconﬁguration of the recognition system required

to respond to changes in views on the screen.

A small number of recognition areas are kept in a cache. You can change the

recognition behavior of a view dynamically by specifying new recognition settings

and invalidating the area cache. The next time the view accepts input, the system

builds a new recognition area reﬂecting its currently-speciﬁed recognition behavior

and the dictionaries it is to use for recognition.

In addition to providing an efﬁcient and ﬂexible means of conﬁguring the

recognition system programmatically,

recConfig frames provide support for

future expansion of the recognition system. The

recConfig frame allows

applications to specify recognition conﬁgurations in a uniform way that is not

dependent on the use of any particular recognizer engine. Although the Newton

platform currently supports only its built-in recognizers, future versions of the

system may permit the use of third-party recognizer engines.

The system provides several standard

recConfig frames that can be placed in your

view’s

recConfig slot or used as a starting point for building your own

recConfig frames. For descriptions of system-supplied recConfig frames, see

“System-Supplied recConﬁg Frames” (page 8-18) in Newton Programmer’s

Reference.

In summary, the recognition behavior that a view exhibits is ultimately determined

by a combination of the following values:

■ values inherited from the system’s user conﬁguration data.

■ values in the view’s viewFlags and entryFlags slots.

■ values in the view’s dictionaries slot when the vCustomDictionaries

ﬂag is set.

■ values speciﬁed by an optional recToggle view, which may override values

inherited from user conﬁguration data or supply additional values.

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