Move generic parameters to associated types in NodeDataTrait

egui_node_graph/src/editor_ui.rs

@@ -44,10 +44,16 @@ pub struct GraphNodeWidget<'a, NodeData, DataType, ValueType> {
 impl<NodeData, DataType, ValueType, NodeTemplate, UserResponse, UserState>
     GraphEditorState<NodeData, DataType, ValueType, NodeTemplate, UserState>
 where
-    NodeData: NodeDataTrait<Response = UserResponse, UserState = UserState>,
+    NodeData: NodeDataTrait<
+        Response = UserResponse,
+        UserState = UserState,
+        DataType = DataType,
+        ValueType = ValueType,
+    >,
     UserResponse: UserResponseTrait,
     ValueType: WidgetValueTrait,
-    NodeTemplate: NodeTemplateTrait<NodeData = NodeData, DataType = DataType, ValueType = ValueType>,
+    NodeTemplate:
+        NodeTemplateTrait<NodeData = NodeData, DataType = DataType, ValueType = ValueType>,
     DataType: DataTypeTrait,
 {
     #[must_use]
@@ -241,18 +247,19 @@ where
 impl<'a, NodeData, DataType, ValueType, UserResponse, UserState>
     GraphNodeWidget<'a, NodeData, DataType, ValueType>
 where
-    NodeData: NodeDataTrait<Response = UserResponse, UserState = UserState>,
+    NodeData: NodeDataTrait<
+        Response = UserResponse,
+        UserState = UserState,
+        DataType = DataType,
+        ValueType = ValueType,
+    >,
     UserResponse: UserResponseTrait,
     ValueType: WidgetValueTrait,
     DataType: DataTypeTrait,
 {
     pub const MAX_NODE_SIZE: [f32; 2] = [200.0, 200.0];
 
-    pub fn show(
-        self,
-        ui: &mut Ui,
-        user_state: &UserState,
-    ) -> Vec<NodeResponse<UserResponse>> {
+    pub fn show(self, ui: &mut Ui, user_state: &UserState) -> Vec<NodeResponse<UserResponse>> {
         let mut child_ui = ui.child_ui_with_id_source(
             Rect::from_min_size(*self.position + self.pan, Self::MAX_NODE_SIZE.into()),
             Layout::default(),
@@ -264,7 +271,11 @@ where
 
     /// Draws this node. Also fills in the list of port locations with all of its ports.
     /// Returns responses indicating multiple events.
-    fn show_graph_node(self, ui: &mut Ui, user_state: &UserState) -> Vec<NodeResponse<UserResponse>> {
+    fn show_graph_node(
+        self,
+        ui: &mut Ui,
+        user_state: &UserState,
+    ) -> Vec<NodeResponse<UserResponse>> {
         let margin = egui::vec2(15.0, 5.0);
         let mut responses = Vec::new();
 

egui_node_graph/src/traits.rs

@@ -28,13 +28,17 @@ where
     type Response;
     /// Must be set to the custom user `UserState` type
     type UserState;
+    /// Must be set to the custom user `DataType` type
+    type DataType;
+    /// Must be set to the custom user `ValueType` type
+    type ValueType;
 
     /// Additional UI elements to draw in the nodes, after the parameters.
-    fn bottom_ui<DataType, ValueType>(
+    fn bottom_ui(
         &self,
         ui: &mut egui::Ui,
         node_id: NodeId,
-        graph: &Graph<Self, DataType, ValueType>,
+        graph: &Graph<Self, Self::DataType, Self::ValueType>,
         user_state: &Self::UserState,
     ) -> Vec<NodeResponse<Self::Response>>
     where
@@ -82,4 +86,4 @@ pub trait NodeTemplateTrait: Clone {
 
 /// The custom user response types when drawing nodes in the graph must
 /// implement this trait.
-pub trait UserResponseTrait: Clone + Copy + std::fmt::Debug + PartialEq + Eq {}
+pub trait UserResponseTrait: Clone + Copy + std::fmt::Debug + PartialEq + Eq {}

egui_node_graph_example/src/app.rs

@@ -242,17 +242,19 @@ impl UserResponseTrait for MyResponse {}
 impl NodeDataTrait for MyNodeData {
     type Response = MyResponse;
     type UserState = MyGraphState;
+    type DataType = MyDataType;
+    type ValueType = MyValueType;
 
     // This method will be called when drawing each node. This allows adding
     // extra ui elements inside the nodes. In this case, we create an "active"
     // button which introduces the concept of having an active node in the
     // graph. This is done entirely from user code with no modifications to the
     // node graph library.
-    fn bottom_ui<DataType, ValueType>(
+    fn bottom_ui(
         &self,
         ui: &mut egui::Ui,
         node_id: NodeId,
-        _graph: &Graph<MyNodeData, DataType, ValueType>,
+        _graph: &Graph<MyNodeData, MyDataType, MyValueType>,
         user_state: &Self::UserState,
     ) -> Vec<NodeResponse<MyResponse>>
     where