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CHAPTER 10

Recognition: Advanced Topics

10-2 About Advanced Topics in Recognition

applications to change these system-wide settings. Instead, individual views can

customize their own recognition behavior by using a

recConfig frame or

recToggle view to override these inherited values locally.

In practice, most views’ recognition behavior is deﬁned by a combination of

inherited and overridden values. For example, because most users tend not to

change the speed at which they write, it’s common for views to use inherited values

for the

timeoutCursiveOption slot, which speciﬁes the relative delay required

to consider a group of input strokes complete. At the same time, individual views

may customize certain recognition settings by overriding values that would

otherwise be inherited from the system’s user conﬁguration data. For example, a

view can use a

recConfig frame to disable the automatic addition of new words

to the user dictionary.

A view based on the

protoRecToggle system prototype provides another way to

override inherited recognition settings. This view provides a picker that allows the

user to change recognition settings easily. Each view controlled by this picker must

provide a

_recogSettings slot that the picker sets according to the user’s

current choice of recognition settings. The value in the

_recogSettings slot

overrides values inherited from the system’s user conﬁguration data.

Your application supplies only one

_recogSettings slot for each recToggle

view it provides. Because views use parent inheritance to ﬁnd a

_recogSettings

slot, a single

recToggle view and a single _recogSettings slot can control

the recognition behavior of one view or multiple views, depending on the

_recogSettings slot’s position in the view hierarchy. For more information, see

“Creating the _recogSettings Slot” beginning on page 10-20.

You can also provide an optional

RecogSettingsChanged method in the

_parent chain of any view controlled by the recToggle view. If a

RecogSettingsChanged method is provided, the recToggle view sends this

message to

self when the user chooses an item in the recToggle picker.Your

RecogSettingsChanged method can perform any application-specific task that

is appropriate; typically, this method reconﬁgures recognition settings in response

to the change in the

recToggle view’s state.

Finally, any view can provide an optional

recConfig frame that speciﬁes the

view’s recognition behavior at the local level.

Although

recConfig frames have thus far been presented as simply an alternate

interface to the recognition system, they are actually used internally by the system

to represent the recognition behavior of each view. When the user writes, draws, or

gestures in a view, the system builds a

recConfig frame that speciﬁes the precise

settings of all the recognizers needed for the view. If you supply a

recConfig

frame for the view, the

recConfig frame that the system builds is based on the

recConfig frame you have supplied and any recognition-related user preferences

that may apply.

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