Apple Newton Utilities Guide de l'utilisateur télécharger pdf (Page 350)

100

101

CHAPTER 9

Recognition

9-8 About the Recognition System

clParagraphView view child. Ink text automatically wraps to the paragraph

boundaries, just as recognized text does. Ink text is also usually reduced in size

when it is drawn, according to the user preference speciﬁed by the Ink Text Scaling

item in the Text Editing preferences slip. Sketch ink, on the other hand, is treated as

a graphic: it is inserted into the view as a

clPolygonView view child. Sketch ink

is always drawn at full size, and in the position at which it was written on the screen.

Thus, stroke bundles are normally returned only to views that do not perform

recognition. To cause the system to always return stroke bundles to the view (in

addition to any word units, gesture units or shape units that may be passed to the

view), set the view’s

vStrokesAllowed ﬂag and provide a ViewStrokeScript

method, as described in “Customized Processing of Input Strokes” beginning on

page 10-40.

The recognition system’s classiﬁcation of user input is essentially a process of

elimination. Enabling and conﬁguring only the recognizers and dictionaries

appropriate to a particular context is the primary means by which you optimize the

recognition system’s performance within your application.

Enabling Recognizers 9

Each view has a viewFlags slot that contains a bit field. The bits in this field

specify characteristics that the view does not inherit from its view class, such as its

recognition behavior. When you set a view ﬂag, it sets bits in this ﬁeld to enable

combinations of recognizers and dictionaries suited to the input you anticipate the

view to receive.

Not all of the bits in this ﬁeld affect recognition; some are used to set other

characteristics, such as the view’s placement on the screen. The bits in this ﬁeld

that affect the recognition system are referred to as the view’s input mask. When

the view is constructed at run time, the system copies the input mask bits and other

view ﬂags’ bits into the view’s

viewFlags slot. shows the relationship of

recognition-related view ﬂags to bits in the

viewFlags slot.

You can set bits in the

viewFlags slot from within the graphical view editor in

Newton Toolkit or you can set them programmatically from within your own

NewtonScript code. Either approach allows you to set combinations of bits to

produce a variety of behaviors.

This book uses the NewtonScript approach for all examples. For information on

using the graphical view editor in Newton Toolkit, see Newton Toolkit User’s Guide.

1 2 ... 345 346 347 348 349 350 351 352 353 354 355 ... 941 942

Commentaires sur ces manuels

Pas de commentaire

Apple Newton Utilities Guide de l'utilisateur Page 350

Commentaires sur ces manuels

Produits connexes et manuels pour Logiciel Apple Newton Utilities