hk_dsvisible
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## hk_dsvisible

This is the base class for visible widgets which do not need access to the data, but do have to know whether or not a datasource is enabled and which row is the actual one.

Inherits from hk_visible.

> set_datasource(datasource)

>   Sets the datasource object of type hk_datasource.

> datasource()

>   return the datasource object of type hk_datasource.

> set_presentationdatasource(number [,registerchange])

>   presentation objects (either a form or a report) administer all datasources themselves. Datasources then can be identified by a unique number. If this visible object is part of a presentation object, you can set this number with this function

> presentationdatasource()

>   returns the number of the used presentation datasource, or -1 if none is set.

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