How to use FreezeColumn in NatTable with Grouped Headers?

[CubeDepth]

Hi, author. Thank you for your response to this issue ! As I described in my question, I found that the FreezeColumn command works fine in code without grouped headers, but it doesn't take effect in tables with grouped headers. Additionally, when there are grouped columns, the Freeze PopMenu in the ColumnHeader also fails to work.

I trigger freeze command by two ways:

1. with this code: natTable.doCommand(new FreezeColumnCommand(gridLayer.getSelectionLayer(), 1));
2. with the Freeze PopMenu in the ColumnHeader

Is my NatTable configuration correct? If there are issues, how should I modify or try to fix it?

I am using NatTable version 2.1.0, and I have also tested it on version 2.5.0 with the same result. Here is the core code for my ColumnHeaderLayer and NatTable configuration:

private ILayer buildColumnHeaderLayer() {
    ILayer columnHeaderLayer = new ColumnHeaderLayer(columnHeaderDataLayer, getBodyLayer(), selectionLayer);
    SortHeaderLayer sortHeaderLayer = new SortHeaderLayer<>(columnHeaderLayer, sortModel);
    ColumnGroupHeaderLayer columnGroupHeaderLayer = new ColumnGroupHeaderLayer(
        sortHeaderLayer, selectionLayer, columnGroupModel);
    columnGroupHeaderLayer.setRowHeight(DEFAULT_ROWHEIGHT);
    if (filterStrategy == null) {
        return columnGroupHeaderLayer;
    }
    FilterRowHeaderComposite<String> filterRowHeaderComposite = new FilterRowHeaderComposite<>(
        filterStrategy,
        columnGroupHeaderLayer, columnHeaderDataProvider, filterStrategy.getConfigRegistry());
    filterRowHeaderComposite.getFilterRowDataLayer().setDefaultRowHeight(DEFAULT_ROWHEIGHT);
    return filterRowHeaderComposite;
}

private NatTable createNatTable(Composite container, BaseGridLayer gridLayer, ConfigRegistry configRegistry) {
    NatTable natTable = new NatTable(container, gridLayer, false);
    natTable.setConfigRegistry(configRegistry);
    natTable.setLayerPainter(new NatGridLayerPainter(natTable, rowHeight));
    natTable.setBackground(GUIHelper.COLOR_WHITE);
    natTable.addConfiguration(new BaseStyleConfiguration());
    natTable.addConfiguration(new BaseFilterConfiguration());
    natTable.addConfiguration(new CurConfiguration());
        natTable.addConfiguration(
            new BaseMenuConfiguration(
                new CurMenuAction(dataProvider, gridLayer.getSelectionLayer())));
        natTable.addConfiguration(new CustomHeaderMenuConfiguration(natTable, new CustomHeaderMenuAction(this, dataProvider)));
    natTable.addConfiguration(new SingleClickSortConfiguration());
    BaseSelectionTipLabel selectionTipLabel = new BaseSelectionTipLabel(parent, dataProvider);
    natTable.addLayerListener(new LayerSectionListener(this, toolBar, selectionTipLabel, this));
    natTable.configure();
    
    dataProvider.update();
    natTable.doCommand(new AutoResizeAllColumnsCommand(natTable));
    natTable.doCommand(new FreezeColumnCommand(gridLayer.getSelectionLayer(), 1));
    return natTable;
}

private PopupMenuBuilder createColumnHeaderMenu(NatTable natTable) {
    ILayer layer = natTable.getLayer();
    PopupMenuBuilder popupMenuBuilder = createMenuBuilder(natTable)
        .withHideColumnMenuItem()
        .withShowAllColumnsMenuItem()
        .withAutoResizeSelectedColumnsMenuItem()
        .withClearAllFilters()
        .withFreezeColumnMenuItem()
        .withUnfreezeMenuItem("Unfreeze column")；

    return popupMenuBuilder;
}

[fipro78]

As already answered in the issue, please have a look at one of our examples, dependent on which column grouping implementation you are using:

• SortableGroupByFilterColumnGroupAndFreezeExample
• SortableGroupByFilterPerformanceColumnGroupAndFreezeExample

You are not sharing your body layer composition. So I can't tell anything else here.

[fipro78]

And IIRC you are using the FreezeColumnCommand with an incorrect position. You are using the SelectionLayer as reference for the position. But the command is handled in the CompositeFreezeLayer. So it might fail because of the position transformation.
Additionally if you want to programmatically freeze a column on startup, you need to do this using a PaintListener. Before the initial paint the width of the freeze layers in the CompositeFreezeLayer are 0 and therefore the command is not processed. For initial programmatic freeze, use a snippet like this:

natTable.addPaintListener(new PaintListener() {

    @Override
    public void paintControl(PaintEvent e) {
        natTable.doCommand(new FreezeColumnCommand(gridLayer.getBodyLayer(), 1));
        natTable.removePaintListener(this);
    }
});

[CubeDepth]

Thank you for your answer! I have already resolved this issue.
I had previously thought that the issue with the FreezeLayer not working on Grouped Headers was due to an incorrect order in my layer configuration. However, after referring to the example of _807_SortableFilterableColumnGroupExample, I realized that I had missed configuring the CompositeFreezeLayer in the BodyLayer. Additionally, if I need to freeze columns by default at startup, I should replace natTable.doCommand(new FreezeColumnCommand(gridLayer.getSelectionLayer(), 1)); with natTable.doCommand(new FreezeColumnCommand(gridLayer.getBodyLayer(), 1));.

Your advice is correct. I need to check the BodyLayer configuration and use the correct FreezeColumnCommand.