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C H A P T E R 1 0
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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