Apple Newton Utilities Podręcznik Użytkownika Pobierz pdf (Strona 368)

100

101

CHAPTER 9

Recognition

9-26 Using the Recognition System

Double Taps” beginning on page 10-41. See also “ViewGestureScript” (page 8-71)

in Newton Programmer’s Reference.

Combining View Flags 9

Generally, you must combine multiple view flags to produce useful recognition

behavior. For example, most views that accept user input set the

vClickable ﬂag

to enable pen input and the

vGesturesAllowed ﬂag to enable recognition of

standard gestures such scrubbing and inserting spaces.

Except where noted otherwise, the NewtonScript “plus” operator (+) is used to

combine view ﬂags, as in the following code fragment.

myViewTemplate :=

{

// recognize taps, gestures, and shapes

viewFlags: vClickable+vGesturesAllowed+vShapesAllowed,

…}

Note

Most combinations of view ﬂags include the vClickable ﬂag.

If you do not set the

vClickable ﬂag, the view does not accept

pen input at all.

◆

Sometimes a particular combination of view ﬂags produces results that seem

incorrect. For example, you might be surprised to discover that a view setting only

the ﬂags

vClickable+vLettersAllowed can occasionally recognize numeric

values. (The

vLettersAllowed ﬂag enables the recognition of single text

characters by the cursive recognizer.) This behavior is caused by the presence of

the symbols dictionary in the set of dictionaries available to the view. The symbols

dictionary includes alphabetic characters, numerals and some punctuation marks.

Most view ﬂags enable this dictionary to support the correction of single letters or

numerals by overwriting. As a side effect, it becomes possible to recognize

extraneous characters or numerals in ﬁelds that ostensibly should not support such

input. This behavior is rarely a problem, however, because the recognition system

is designed to show a strong preference for “appropriate” interpretations of input as

deﬁned by the view ﬂags set for the view.

Although you might expect that the presence of the symbols dictionary would

allow a view setting only the ﬂags

vClickable+vNumbersAllowed to return

alphabetic characters, this behavior is quite difﬁcult to produce. Views that set the

vNumbersAllowed flag show a much stronger preference for single-digit

numbers than single alphabetic characters. However, letters that do not look similar

to numeric values—for example, the letter

W—may produce this particular form of

misrecognition.

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