Apple Newton Utilities Guía de usuario descargar pdf (Pagina 387)

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CHAPTER 10

Recognition: Advanced Topics

Using Advanced Topics in Recognition 10-11

Sketch ink, like shapes, is displayed only in views based on the clEditView

class. As a rule of thumb, consider sketch ink and ink text to be mutually exclusive

when conﬁguring recognition in views; for best results, conﬁgure your input view

to recognize only one of these two data types.

Views based on the

clEditView class handle sketch ink and ink text automatically.

For other views, the system invokes the view’s

ViewInkWordScript or

ViewRawInkScript method when ink arrives. For more details, see the

descriptions of these methods in

Newton Programmer’s Reference.

The system-supplied

ROM_rcInkOrText constant provides a ready-to-use

recConfig frame that allows views based on the clParagraphView class to

contain ink text in addition to normal text. To use this

recConfig frame to create

a view that supports ink text, you’ll need to take the following steps:

■ Create a view template that protos from the clParagraphView class.

■ In your view template, create a recConfig slot that holds the

ROM_rcInkOrText constant. For more information, see “Creating a recConfig

Frame” beginning on page 10-9.

■ Provide a protoRecToggle view that allows the user to choose text or ink

text settings; if your application provides a status bar, you need to provide the

recToggle view as one of its children. For more information, see “Creating

the recToggle View” beginning on page 10-19.

■ Provide a _recogSettings slot at an appropriate position in the recToggle

view’s

_parent chain. For more information see “Creating the _recogSettings

Slot” beginning on page 10-20.

Normally, the input view tries to recognize input using all currently enabled

recognizers. If no recognizers are enabled or if recognition fails for some reason—

for example, due to messy input or some sort of error—then the view system

converts the input strokes into ink. The

doInkWordRecognition slot in the

input view’s

recConfig frame speciﬁes the kind of ink that the system creates

from the input strokes.

When the

doInkWordRecognition slot holds a non-nil value, the system

returns ink text; when this slot holds the

nil value, the system returns sketch ink.

This slot is described fully in “protoRecConﬁg” (page 8-36) in Newton

Programmer’s Reference. Table 10-1 on page 10-12 summarizes the kinds of data

returned by the recognition system when recognition fails in an edit view or

paragraph view that is controlled by a

recToggle view.

Note that when the input view is set to recognize shapes, the smoothed and cleaned

up ink that is returned may be ink text but is more likely to be a curve shape. Aside

from the failure of shape recognition, the only time raw ink is returned to the view

is when its associated

recToggle is set to “Sketches”.

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