Merge pull request #38 from kkngsm/connection-color

Connection color for each data type

egui_node_graph/src/editor_ui.rs

@@ -55,7 +55,7 @@ where
     ValueType: WidgetValueTrait,
     NodeTemplate:
         NodeTemplateTrait<NodeData = NodeData, DataType = DataType, ValueType = ValueType>,
-    DataType: DataTypeTrait,
+    DataType: DataTypeTrait<UserState>,
 {
     #[must_use]
     pub fn draw_graph_editor(
@@ -150,13 +150,9 @@ where
         }
 
         /* Draw connections */
-
-        let connection_color = if ui.visuals().dark_mode {
-            color_from_hex("#efefef").unwrap()
-        } else {
-            color_from_hex("#bbbbbb").unwrap()
-        };
         if let Some((_, ref locator)) = self.connection_in_progress {
+            let port_type = self.graph.any_param_type(*locator).unwrap();
+            let connection_color = port_type.data_type_color(&self.user_state);
             let start_pos = port_locations[locator];
             let (src_pos, dst_pos) = match locator {
                 AnyParameterId::Output(_) => (start_pos, cursor_pos),
@@ -166,6 +162,11 @@ where
         }
 
         for (input, output) in self.graph.iter_connections() {
+            let port_type = self
+                .graph
+                .any_param_type(AnyParameterId::Output(output))
+                .unwrap();
+            let connection_color = port_type.data_type_color(&self.user_state);
             let src_pos = port_locations[&AnyParameterId::Output(output)];
             let dst_pos = port_locations[&AnyParameterId::Input(input)];
             draw_connection(ui.painter(), src_pos, dst_pos, connection_color);
@@ -298,7 +299,7 @@ where
     >,
     UserResponse: UserResponseTrait,
     ValueType: WidgetValueTrait,
-    DataType: DataTypeTrait,
+    DataType: DataTypeTrait<UserState>,
 {
     pub const MAX_NODE_SIZE: [f32; 2] = [200.0, 200.0];
 
@@ -404,10 +405,11 @@ where
         let port_right = outer_rect.right();
 
         #[allow(clippy::too_many_arguments)]
-        fn draw_port<NodeData, DataType, ValueType, UserResponse>(
+        fn draw_port<NodeData, DataType, ValueType, UserResponse, UserState>(
             ui: &mut Ui,
             graph: &Graph<NodeData, DataType, ValueType>,
             node_id: NodeId,
+            user_state: &UserState,
             port_pos: Pos2,
             responses: &mut Vec<NodeResponse<UserResponse>>,
             param_id: AnyParameterId,
@@ -415,7 +417,7 @@ where
             ongoing_drag: Option<(NodeId, AnyParameterId)>,
             is_connected_input: bool,
         ) where
-            DataType: DataTypeTrait,
+            DataType: DataTypeTrait<UserState>,
             UserResponse: UserResponseTrait,
         {
             let port_type = graph.any_param_type(param_id).unwrap();
@@ -432,7 +434,7 @@ where
             let port_color = if resp.hovered() {
                 Color32::WHITE
             } else {
-                port_type.data_type_color()
+                port_type.data_type_color(user_state)
             };
             ui.painter()
                 .circle(port_rect.center(), 5.0, port_color, Stroke::none());
@@ -478,6 +480,7 @@ where
                     ui,
                     self.graph,
                     self.node_id,
+                    user_state,
                     pos_left,
                     &mut responses,
                     AnyParameterId::Input(*param),
@@ -499,6 +502,7 @@ where
                 ui,
                 self.graph,
                 self.node_id,
+                user_state,
                 pos_right,
                 &mut responses,
                 AnyParameterId::Output(*param),

egui_node_graph/src/traits.rs

@@ -10,9 +10,9 @@ pub trait WidgetValueTrait {
 /// This trait must be implemented by the `DataType` generic parameter of the
 /// [`Graph`]. This trait tells the library how to visually expose data types
 /// to the user.
-pub trait DataTypeTrait: PartialEq + Eq {
+pub trait DataTypeTrait<UserState>: PartialEq + Eq {
     // The associated port color of this datatype
-    fn data_type_color(&self) -> egui::Color32;
+    fn data_type_color(&self, user_state: &UserState) -> egui::Color32;
 
     // The name of this datatype
     fn name(&self) -> &str;

egui_node_graph_example/src/app.rs

@@ -89,8 +89,8 @@ pub struct MyGraphState {
 // =========== Then, you need to implement some traits ============
 
 // A trait for the data types, to tell the library how to display them
-impl DataTypeTrait for MyDataType {
+impl DataTypeTrait<MyGraphState> for MyDataType {
-    fn data_type_color(&self) -> egui::Color32 {
+    fn data_type_color(&self, _user_state: &MyGraphState) -> egui::Color32 {
         match self {
             MyDataType::Scalar => egui::Color32::from_rgb(38, 109, 211),
             MyDataType::Vec2 => egui::Color32::from_rgb(238, 207, 109),