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CHAPTER 10

Recognition: Advanced Topics

10-38 Using Advanced Topics in Recognition

You may also need to know the boundaries of the word in the text slot when

working with certain

protoCharEdit methods and functions. The

protoCharEdit view’s wordLeft and wordRight slots provide indexes into

the

text string that you can use to determine the boundaries of a substring suitable

for external display or for use as an argument to these routines. The

wordLeft

slot contains the index of the ﬁrst externally-displayed character in the

text slot.

The

wordRight slot contains the index of the position immediately following the

last externally-displayed character in the

text slot. For example, when the text

slot holds the

"one "string, 1 is the value of the wordLeft slot and 4 is the value

of the

wordRight slot. The dispLeft slot contains the index of the ﬁrst

character in the

text slot that is displayed—this character occupies the leftmost

position in the comb view. The

dispLeft slot normally has the value 0, but after

scrolling it may have values greater than 0. The

dispIndent slot is the offset

from the leftmost edge of the view to the leftmost edge of the ﬁrst character displayed.

For more information, see “protoCharEdit Functions and Methods” (page 8-47) in

Newton Programmer’s Reference.

Restricting Characters Returned by protoCharEdit Views 10

This section provides code examples illustrating the use of templates to restrict the

set of characters that may appear in a comb view. Note that templates post-process

the characters returned by the recognition system before the view displays them,

rather than limiting the set of characters that the view can recognize.

The templates deﬁned by the following code fragments are intended to serve as

examples only. The system provides templates that handle formatting conventions

for dates, times, phone numbers, and numeric values properly according to the

user’s locale. For complete descriptions of these templates, see “System-Supplied

protoCharEdit Templates” (page 8-46) in Newton Programmer’s Reference.

The following code example deﬁnes a template for a date ﬁeld:

digits := "0123456789";// filters[0]

digits1 := "01"; // filters[1]

digits3 := "0123"; // filters[2]

dateTemplate := {

string:" / / ",// slashes locked by "_" in format

format:"10_20_00",// indexes into filters array

filters:[digits, digits1, digits3],

};

This example template is used in a protoCharEdit view that speciﬁes a value of

8 or more for its maxChars slot; hence, the eight-character strings in the format

and

string slots.

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