Apple Newton Utilities Guide de l'utilisateur télécharger pdf (Page 364)

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CHAPTER 9

Recognition

9-22 Using the Recognition System

recognition behavior by setting view ﬂags or providing a recConfig frame.

Speciﬁcally,

clEditView views create clParagraphView or

clPolygonView child views automatically as required to display output from the

recognition system. To use other kinds of views for recognition, you may need to

provide

viewXxxScript methods that create these child views and respond in

other ways to recognition system events.

Conﬁguring the Recognition System 9

You can take the following approaches to configuring the recognition system:

■ Set view ﬂags only. This approach works well for most applications and is

described in this chapter.

■ Set view ﬂags and allow the user to conﬁgure recognition from a

protoRecToggle view that you provide. The easiest way to do this is by

setting the

vAnythingAllowed mask, which is described in this chapter.

This approach supports the use of ink text in

clEditView views. Use of

the

protoRecToggle view is described in Chapter 10, “Recognition:

Advanced Topics.”

■ Set view ﬂags and supply a recognition conﬁguration frame based on

ROM_rcInkOrText. This approach supports ink text in clEditView views.

You should provide a

protoRecToggle view as well, to allow the user to

switch easily between text and ink text.

■ Supply a recognition conﬁguration frame of some other kind. This approach

offers you the most control and ﬂexibility, but also requires the most work to

implement. The difﬁculty of enabling ink text according to the value of a

protoRecToggle view depends on the particular implementation of your

recConfig frame. Recognition configuration frames are described in

Chapter 10, “Recognition: Advanced Topics.”

■ Use the RecogSettingsChanged message sent by the protoRecToggle

view to enable recognition behaviors dynamically. This technique is described in

Chapter 10, “Recognition: Advanced Topics.”

Except where noted otherwise, all of the ﬂags described in this chapter are set in

the view’s

viewFlags slot. When setting the values of viewFlags slots,

remember that in order to produce useful behavior you may need to set other bits in

addition to the recognition-oriented ones that this chapter describes. To preserve

settings that your view’s

viewFlags slot inherits from its view class, you should

logically

OR changes to bits in this slot.

For information on non-recognition view ﬂags provided by the system, see

Chapter 3, “Views.”

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