Sector export: Hide empty Refinement Regions folder in project tree

Add shouldBeVisibleInTree() to RimRefinementRegionCollection (true only
when at least one region exists) and consult it from
RimEclipseView::defineUiTreeOrdering. Refresh the parent view's
connected editors from addNewRegion, removeRegion, and onChildDeleted so
the folder appears and disappears as regions are added or removed via
the generic delete-item action.

The "New Refinement Region" action remains reachable from the Eclipse
view's context menu while the folder is hidden.

ApplicationLibCode/ProjectDataModel/RimEclipseView.cpp

@@ -2063,7 +2063,7 @@ void RimEclipseView::defineUiTreeOrdering( caf::PdmUiTreeOrdering& uiTreeOrderin
 {
     uiTreeOrdering.add( m_overlayInfoConfig() );
     uiTreeOrdering.add( m_gridCollection() );
-    if ( m_refinementRegions() ) uiTreeOrdering.add( m_refinementRegions() );
+    if ( m_refinementRegions() && m_refinementRegions()->shouldBeVisibleInTree() ) uiTreeOrdering.add( m_refinementRegions() );
     uiTreeOrdering.add( cellResult() );
     uiTreeOrdering.add( cellEdgeResult() );
     uiTreeOrdering.add( cellFilterCollection() );

ApplicationLibCode/ProjectDataModel/RimRefinementRegionCollection.cpp

@@ -51,6 +51,14 @@ bool RimRefinementRegionCollection::isActive() const
     return m_isActive();
 }
 
+//--------------------------------------------------------------------------------------------------
+///
+//--------------------------------------------------------------------------------------------------
+bool RimRefinementRegionCollection::shouldBeVisibleInTree() const
+{
+    return !m_regions.empty();
+}
+
 //--------------------------------------------------------------------------------------------------
 ///
 //--------------------------------------------------------------------------------------------------
@@ -86,6 +94,9 @@ RimRefinementRegion* RimRefinementRegionCollection::addNewRegion( RimEclipseCase
     region->setDefaultsFromCase( eclipseCase );
 
     updateConnectedEditors();
+    // Visibility of this collection in the parent view's tree depends on m_regions being non-empty,
+    // so refresh the parent so the folder appears when the first region is added.
+    if ( auto* view = firstAncestorOrThisOfType<Rim3dView>() ) view->updateConnectedEditors();
     return region;
 }
 
@@ -106,6 +117,17 @@ void RimRefinementRegionCollection::removeRegion( RimRefinementRegion* region )
     m_regions.removeChild( region );
     delete region;
     updateConnectedEditors();
+    if ( auto* view = firstAncestorOrThisOfType<Rim3dView>() ) view->updateConnectedEditors();
+}
+
+//--------------------------------------------------------------------------------------------------
+/// Refresh the parent view's tree so the collection folder disappears once the last region is
+/// removed via the generic delete-item action.
+//--------------------------------------------------------------------------------------------------
+void RimRefinementRegionCollection::onChildDeleted( caf::PdmChildArrayFieldHandle*      childArray,
+                                                    std::vector<caf::PdmObjectHandle*>& referringObjects )
+{
+    if ( auto* view = firstAncestorOrThisOfType<Rim3dView>() ) view->updateConnectedEditors();
 }
 
 //--------------------------------------------------------------------------------------------------

ApplicationLibCode/ProjectDataModel/RimRefinementRegionCollection.h

@@ -49,6 +49,9 @@ public:
 
     bool isActive() const;
 
+    // Hide the collection node in the project tree while it has no regions, to keep the tree tidy.
+    bool shouldBeVisibleInTree() const;
+
     std::vector<RimRefinementRegion*> regions() const;
     std::vector<RimRefinementRegion*> activeRegions() const;
 
@@ -66,6 +69,7 @@ public:
 
 protected:
     void fieldChangedByUi( const caf::PdmFieldHandle* changedField, const QVariant& oldValue, const QVariant& newValue ) override;
+    void onChildDeleted( caf::PdmChildArrayFieldHandle* childArray, std::vector<caf::PdmObjectHandle*>& referringObjects ) override;
 
 private:
     caf::PdmField<bool>                           m_isActive;