Apple Newton Utilities Betriebsanweisung PDF herunterladen (Seite 367)

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CHAPTER 9

Recognition

Using the Recognition System 9-25

You can solve this problem by setting the top view’s vClickable ﬂag without

providing a

ViewClickScript method. (The top view need not handle the taps,

only prevent them from being passed on to the other view.)

Recognizing Shapes 9

The vShapesAllowed flag enables the recognition of geometric shapes such as

circles, straight lines, polygons, and so on. Do not set this ﬂag for views that

handle text input only. This ﬂag is intended for use only in views based on the

clEditView class. The clEditView class provides the built-in Notepad

application’s note stationery with much of its recognition behavior.

The shapes displayed on the screen are

clPolygon views returned as the children

of the

clEditView that accepted the input strokes. There is no developer

interface to shape recognition; to manipulate shapes returned by the recognition

system, you must extract the polygon views from the edit view yourself. In some

cases, you may ﬁnd the

ViewAddChildScript method useful for this purpose.

The

ViewAddChildScript message is sent when a child view is added to a view.

When multiple shapes are returned to an edit view, its

ViewAddChildScript

method is called once for each shape.

When multiple ink text words are returned to an edit view, the

ViewAddChildScript method is invoked when the clParagraphView that

holds the ink text is added as the child of the edit view, but this method is not

invoked as ink text words are added to the paragraph view.

In views not based on the

clEditView class, the arrival of each ink word is

signalled by a

ViewInkWordScript message.

Recognizing Standard Gestures 9

Setting the vGesturesAllowed flag supplies system-defined behavior for the

gestures tap, double tap, highlight, scrub, line, caret, and caret-drag. Most input

views set the

vGesturesAllowed ﬂag, as they need to respond to standard

gestures such as scrubbing to delete text or ink. At present, you cannot deﬁne new

gestures to the system.

When the

vGesturesAllowed ﬂag is set, the gesture recognizer invokes the

view’s

ViewGestureScript method before handling the gesture. Normally,

you don’t need to supply a

ViewGestureScript method for clEditView or

clParagraphView views. These views handle all system-defined gestures

automatically.

Your

ViewGestureScript method is invoked only for gestures that the view

system does not handle automatically. For information on intercepting standard

gestures before the view system handles them, see “Customized Processing of

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