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Chapter 3: Data Management 65
iTool Developer’s Guide Data Update Mechanism
Data Update Mechanism
When the data contained in a data item changes (usually as the result of the
application of a data-centric operation), all visualizations that depend on that data
item are automatically notified of the change via a call to the visualization object’s
OnDataChangeUpdate method. (See “Creating an OnDataChangeUpdate Method”
on page 133 for details.)
The data update mechanism is automatic; if you have assigned iTool data types (and,
optionally, parameter names) to your data objects, the data matching mechanisms of
the IDLitParameter interface will ensure that updates happen when necessary. Unless
you have modified core iTool functionality, you do no need to handle data change
updates yourself.