Add NodeDataTrait::separator

egui_node_graph/src/editor_ui.rs

@@ -600,6 +600,13 @@ where
                         responses.extend(node_responses.into_iter().map(NodeResponse::User));
                     }
 
+                    self.graph[self.node_id].user_data.separator(
+                        ui,
+                        self.node_id,
+                        self.graph,
+                        user_state,
+                    );
+
                     self.graph[param_id].value = value;
 
                     let height_after = ui.min_rect().bottom();
@@ -616,6 +623,14 @@ where
                         .output_ui(ui, self.node_id, self.graph, user_state, &param_name)
                         .into_iter(),
                 );
+
+                self.graph[self.node_id].user_data.separator(
+                    ui,
+                    self.node_id,
+                    self.graph,
+                    user_state,
+                );
+
                 let height_after = ui.min_rect().bottom();
                 output_port_heights.push((height_before + height_after) / 2.0);
             }

egui_node_graph/src/traits.rs

@@ -158,6 +158,22 @@ where
         None
     }
 
+    /// Separator to put between elements in the node.
+    ///
+    /// Invoked between inputs, outputs and bottom UI. Useful for
+    /// complicated UIs that start to lose structure without explicit
+    /// separators.
+    ///
+    /// Default implementation does nothing.
+    fn separator(
+        &self,
+        _ui: &mut egui::Ui,
+        _node_id: NodeId,
+        _graph: &Graph<Self, Self::DataType, Self::ValueType>,
+        _user_state: &mut Self::UserState,
+    ) {
+    }
+
     fn can_delete(
         &self,
         _node_id: NodeId,