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C H A P T E R 1 0
Recognition: Advanced Topics
Using Advanced Topics in Recognition
10-37
Manipulating Text in protoCharEdit Views
10
The default view provided by the
protoCharEdit
proto is an unformatted comb
view (see page 10-4). You can provide an optional template that customizes this
view's appearance and behavior. The template itself is a frame residing in the view's
template
slot. This frame may provide the following slots and methods:
The template's
filter
slot defines a set of permissible input values. For
example, a view for correcting phone numbers might restrict the set of
permissible characters to numerals.
The template's
format
slot can specify the length of the comb view and the
editing characteristics of its entry fields. For example, the phone number
correction view might use a format template to restrict input to a fixed number
of characters and make certain entry fields non-editable. When the comb view
erases invalid characters it displays the animated cloud and plays the
ROM_poof
sound that normally accompanies the scrub gesture.
The template's
text
slot supplies a string to be displayed initially when the
comb view opens. The comb view retrieves this value when its
ViewSetupFormScript
is executed.
You can also supply optional
SetupString
and
CleanupString
functions
that manipulate the string in the
text
slot.
For complete descriptions of these slots, see "Template Used by ProtoCharEdit
Views"(page 8-45) and "Application-Defined protoCharEdit Template Methods"
(page 8-52) in Newton Programmer's Reference.
The system also provides several global functions that are useful for manipulating
protoCharEdit
views and the strings they display.
To change the comb view's text string or template dynamically, call the
UseTextAndTemplate
function after setting appropriate values for the
text
or
template
slots. Alternatively, you can use the
SetNewWord
or
SetNewTemplate
and
UseNewWord
or
UseNewTemplate
functions to perform
the same operations; in fact, calling these functions yourself is faster than calling
the
UseTextAndTemplate
function.
To get the current value of the text in the comb view, you can send the
CurrentWord
message to the view. You must not use the value of the
text
slot
directly, because unformatted comb views may add extra spaces to the string in this
slot. To get a special version of the text that is formatted for display in a view other
than the comb view, use the
GetWordForDisplay
function. If you are using a
template, this function may return the string in a more standardized format,
because it calls the template's optional
CleanupString
function before returning
the string.
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