Apple Newton Utilities Guia do Utilizador descarregar pdf (Página 394)

100

101

CHAPTER 10

Recognition: Advanced Topics

10-18 Using Advanced Topics in Recognition

▲ W ARNING

The SetValue function may not be appropriate for

setting the

entryFlags slot in views that do not

have a

viewFlags slot. In these kinds of views, set the

value of the

entryFlags slot directly and then call the

PurgeAreaCache function to invalidate the area cache. If you

have changed values in the system’s user conﬁguration data, call

the

ReadCursiveOptions function instead of the

PurgeAreaCache function. ▲

You can also use the PurgeAreaCache function to invalidate the area cache. This

function provides an efﬁcient way to force the reconstruction of recognition areas

after you’ve changed the values of slots in multiple views. Note, however, that this

function does not resynchronize the recognition system with changes in the

system’s user conﬁguration data. Do not call

PurgeAreaCache to effect changes

in user preferences for recognition.

User preferences that affect recognition behavior are saved as slot values in the

system’s user conﬁguration data. Some of these values, such as that of the

timeoutCursiveOption slot, affect all views; others affect only views that set

the

vAnythingAllowed mask. For detailed information about the slot you need

to set, see its description in “System-Wide Settings” (page 8-2) in Newton

Programmer’s Reference.

When setting user preferences for recognition, do not modify the system’s user

conﬁguration data directly. Instead, use the

GetUserConfig and

SetUserConfig global functions to manipulate user configuration values.

After calling the

SetUserConfig function to set one or more new values, you

must call the

ReadCursiveOptions function to cause the recognition system to

use the new values. Do not call the

PurgeAreaCache function after changing

values in the system’s user conﬁguration data—this function does not even test for

changes to user preferences. Because the

ReadCursiveOptions function

invalidates the area cache, you need not call the

PurgeAreaCache function after

calling the

ReadCursiveOptions function.

IMPORTANT

The view’s viewFlags slot must contain the same recognition

ﬂags as the

inputMask slot in its recConfig frame. Certain

view system operations depend on the

viewFlags slot being set

up properly.

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