UseDataSource

This is the real data source id a widget is using, the id can be:

• mainDataSourceId, when the widget uses main data source directly.
• ${mainDataSourceId}-${dataViewId} , when the widget uses a data view. Please use this id to call dataSourceManager.getDataSource() .

jimu field name array. If no fields, means the widget can work with any field.

Main data source is user configured data source or widget output data source. If the data source is in a data source set, need to use rootDataSourceId to get dataSourceJson.

The data source a widget uses may be a child data source of another data source, so we save the root data source id here so we can create data source easily.

If true, the widget will use popup info of a layer data source. For example, widgets use fields configured in popup info as display fields.

If true, the widget will use symbol of a layer data source. For example, image widget can display symbol of records.