"Construct Features" button does not trigger IEditEvents_OnCreateFeature?

RyanClark

I'm building an Editor Extension that adds functionality to the IEditor.OnCreateFeature event. I noticed that my event handler is not triggered when someone uses the "Construct Features" button on the Topology toolbar.

We frequently use that button to build polygons from lines, and I need those create events to be captured as well. Any suggestions? I'm trying to avoid a ClassExtension...

Thanks,
Ryan

RyanClark

Okay, I found the solution, though the API documentation is not very clear at all. I'm using IEditEvents, but since I couldn't get the OnCreateFeature event to fire, I was looking at other options. Looking at the IObjectClassEvents page:

Listeners of the OnCreate event are not necessarily notified every time an object is created. The event is triggered following a call to IRow.Store, and by default this does not occur when objects or simple features are created using an insert cursor. This can be overridden by setting the IWorkspaceEditControl.SetStoreEventsRequired property to true, or by implementing the optional IObjectClassInfo interface on the class' extension.

It turns out this also pertains to the IEditEvents.OnCreateFeature event, although that is not indicated on the IEditEvents help page.

The solution was pretty simple, use the IWorkspaceEditControl.SetStoreEventsRequired(); method during the IEditEvents.OnStartEditing handler. This causes the "Create Features" tool on the topology toolbar to do Row.Store operations rather than use an Insert cursor. I'm guessing there is  going to be a performance hit, but that's the price you pay for the functionality I guess...

       

void m_Editor_OnStartEditing()
        {
            // Check that the workspace being edited is NCGMP-valid.
            m_EditWorkspace = m_Editor.EditWorkspace;
            m_DatabaseIsValid = ncgmpChecks.IsWorkspaceMinNCGMPCompliant(m_EditWorkspace);

            // I have to do this because the topology tool uses an Insert cursor, bypassing the OnCreate event!
            IWorkspaceEditControl wsEditControl = (IWorkspaceEditControl)m_EditWorkspace;
            wsEditControl.SetStoreEventsRequired();
        }