Q&A - Question

The legend control has an option ShowSubLayers in the Options property. If a layer has sublayers, they should be displayed automatically.

Thanks, I had found this, the issue was that ControlLegend needed the mode changed to show groups ...

GIS_ControlLegend1.Mode := gisControlLegendModeGroups;
 

Do you mean sublayers like in DXF files? I see a big difference between sublayers and the groups functionality of the legend.

Sublayers are file related and its data structure, e.g. DXF_LAYER in a DXF file.

Groups is a set of layers nicely ordered with a name in the legend.

Does this setting really answer your question?

 

I needed to create an object then create sub-items of that group e.g. parent & child style. The gisControlLegend Mode allows me to do this for layers I create programmatically and so resolves my issue.

I have noticed however that when importing DXF files with several layers, sometimes the import produces sub-layers and sometimes not, what governs whether a sub-layer is shown, is it the DXF version ?

In DXF the attribute DXF_LAYER controls this behavior. Every unique value makes a sublayer in the DXF layer in TatukGIS.

I have created a tool which can export data from all visible layers in a certain extent to 1 DXF file.
This is done by giving the DXF_LAYER the name of the layer e.g.