Apple Newton Utilities Guide de l'utilisateur télécharger pdf (Page 386)

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CHAPTER 10

Recognition: Advanced Topics

10-10 Using Advanced Topics in Recognition

exact complement of slots and values required is determined by the recognition

features your

recConfig frame is intended to supply; for more information,

including complete descriptions of the system-supplied

recConfig frames, see

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

Reference.

Once you’ve created a RAM-based

recConfig frame, you must cause the

recognition system to use it. This process is described in “Changing Recognition

Behavior Dynamically” beginning on page 10-17. For a code example showing

how to create a

recConfig frame based on one of the system-supplied

prototypes, see “Creating Single-Letter Input Views” beginning on page 10-15.

Using RecConﬁg Frames to Enable Recognizers 10

To enable or disable recognizers unconditionally, supply appropriate values

for the

doTextRecognition, doShapeRecognition, or

doInkWordRecognition slots your view’s recConfig frame provides. For

descriptions of these slots, see “protoRecConﬁg” (page 8-36) in Newton

Programmer’s Reference.

For some operations, you may wish to restrict the recognizers that the user can

enable in a view while still respecting the rest of the preferences indicated in the

system’s user conﬁguration data. The optional slots

allowTextRecognition

and

allowShapeRecognition in the view’s recConfig frame are intended

for use with views having an input mask that is

vAnythingAllowed. For

complete descriptions of these slots, see “protoRecConﬁg” (page 8-36) in Newton

Programmer’s Reference. Note that you can also allow the user to set the values of

these slots from a

protoRecToggle view instead of setting them yourself in the

recConfig frame.

Views that use the

allowSomethingRecognition slots allow the user to turn on

only the recognizers that you specify while respecting all other user preferences.

Any subset of

allowSomethingRecognition slots can be speciﬁed to allow

the user to enable any appropriate combination of recognizers from the

protoRecToggle view or user preferences.

For example, setting the value of the

allowTextRecognition slot to true

allows the user to enable the text recognizer in the view controlled by the

recConfig frame while the doTextRecognition slot in the system’s user

conﬁguration data holds a non-

nil value.

Returning Text, Ink Text or Sketch Ink 10

This section discusses the use of recToggle views with system-supplied view

classes and

recConfig frames to provide views that can display text, ink text, or

sketch ink.

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Apple Newton Utilities Guide de l'utilisateur Page 386

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