Notifying Changes to Data or Customizing Objects

Use

The data container informs graphics proxies of changes to data and/or customizing objects automatically so that they can update their graphics accordingly.

Process

The data container calls the graphics proxy's method NOTIFY in IF_GP_NOTIFICATION. It can give one of three reasons for the message:

• Data was changed in the data container. Changed data should be read from the data container and the graphic updated.

• Data has changed in the data container. All the data should be read from the data container and the graphic updated.

• The data container cancels the registration - that is, it does not send any more data. This message is possible/necessary if the data container is destroyed before all the graphics proxies have cancelled their registration.

• Data was not changed but customizing objects were changed (see documentation on the method NOTIFY in the class builder).

For more information, see Reading and Changing Values.

Result

The graphics proxies are now aware of changes to data in the data container or that the registration has been cancelled.