如何配置NatTable FilterComboBox以为每列提供不同的DataProvider

Question

In my NatTable I am using a ComboBoxFilterRowHeaderComposite similar to ExcelLikeFilterRowCustomTypesExample . It works fairly well however the combo box filtering adds too many items in large tables to allow for easy filtering. I am trying to fix this by only filling the combo with certain items, however; in my table some columns are just for types or operations which have a limited amount of different values and I would like to add all options for those. While for other columns I'd like to only add root items.

To achieve this I think I need to modify the comboBoxDataProvider, however; for the full effect that I want it would require a different dataprovider for some columns.

Is this the correct approach? And if so how would I go about doing this?

This is how I am currently configuring my combo box composite:

    ComboBoxFilterRowHeaderComposite<GroupedPerfRecord> filterRowHeaderLayer =
            new ComboBoxFilterRowHeaderComposite<GroupedPerfRecord>(
                    bodyLayerStack.getFilterList(),
                    bodyLayerStack.getBodyDataLayer(),
                    bodyLayerStack.getSortedList(),                     
                    columnPropertyAccessor, columnHeaderLayer,
                    columnHeaderDataProvider, configRegistry, false);

    final IComboBoxDataProvider comboBoxDataProvider = filterRowHeaderLayer.getComboBoxDataProvider();
    filterRowHeaderLayer.addConfiguration(new ComboBoxFilterRowConfiguration() {
        {
            this.cellEditor = new FilterRowComboBoxCellEditor(comboBoxDataProvider, 5);
            this.filterIconPainter = new ComboBoxFilterIconPainter(comboBoxDataProvider, GUIHelper.getImage("filter"), null);
        }
    });

Answer 1

With a default filter row that has combo boxes for single selection you would use different IComboBoxDataProvider for each column. But you have chosen the ComboBoxFilterRowHeaderComposite that has a different filtering mechanism in the back to support multi selection and handling of Select All similar to well-known spreadsheet applications. So there is no build-in mechanism that would allow to simply configure the desired behavior.

But there is a constructor in the ComboBoxFilterRowHeaderComposite that takes a FilterRowComboBoxDataProvider as parameter. So you could provide your own implementation of a FilterRowComboBoxDataProvider (maybe subclass the GlazedListsFilterRowComboBoxDataProvider ) and implement the desired behavior in getValue() based on the column index.