impl Default in some struct

egui_node_graph/src/editor_ui.rs

@@ -47,7 +47,15 @@ pub enum NodeResponse<UserResponse: UserResponseTrait, NodeData: NodeDataTrait>
 pub struct GraphResponse<UserResponse: UserResponseTrait, NodeData: NodeDataTrait> {
     pub node_responses: Vec<NodeResponse<UserResponse, NodeData>>,
 }
-
+impl<UserResponse: UserResponseTrait, NodeData: NodeDataTrait> Default
+    for GraphResponse<UserResponse, NodeData>
+{
+    fn default() -> Self {
+        Self {
+            node_responses: Default::default(),
+        }
+    }
+}
 pub struct GraphNodeWidget<'a, NodeData, DataType, ValueType> {
     pub position: &'a mut Pos2,
     pub graph: &'a mut Graph<NodeData, DataType, ValueType>,

egui_node_graph/src/ui_state.rs

@@ -4,7 +4,7 @@ use std::marker::PhantomData;
 #[cfg(feature = "persistence")]
 use serde::{Deserialize, Serialize};
 
-#[derive(Copy, Clone)]
+#[derive(Default, Copy, Clone)]
 #[cfg_attr(feature = "persistence", derive(Serialize, Deserialize))]
 pub struct PanZoom {
     pub pan: egui::Vec2,
@@ -38,17 +38,27 @@ impl<NodeData, DataType, ValueType, NodeKind, UserState>
 {
     pub fn new(default_zoom: f32) -> Self {
         Self {
-            graph: Graph::new(),
-            node_order: Vec::new(),
-            connection_in_progress: None,
-            selected_node: None,
-            node_positions: SecondaryMap::new(),
-            node_finder: None,
             pan_zoom: PanZoom {
                 pan: egui::Vec2::ZERO,
                 zoom: default_zoom,
             },
-            _user_state: PhantomData,
+            ..Default::default()
+        }
+    }
+}
+impl<NodeData, DataType, ValueType, NodeKind, UserState> Default
+    for GraphEditorState<NodeData, DataType, ValueType, NodeKind, UserState>
+{
+    fn default() -> Self {
+        Self {
+            graph: Default::default(),
+            node_order: Default::default(),
+            connection_in_progress: Default::default(),
+            selected_node: Default::default(),
+            node_positions: Default::default(),
+            node_finder: Default::default(),
+            pan_zoom: Default::default(),
+            _user_state: Default::default(),
         }
     }
 }

egui_node_graph_example/src/app.rs

@@ -341,6 +341,7 @@ type MyGraph = Graph<MyNodeData, MyDataType, MyValueType>;
 type MyEditorState =
     GraphEditorState<MyNodeData, MyDataType, MyValueType, MyNodeTemplate, MyGraphState>;
 
+#[derive(Default)]
 pub struct NodeGraphExample {
     // The `GraphEditorState` is the top-level object. You "register" all your
     // custom types by specifying it as its generic parameters.
@@ -349,14 +350,6 @@ pub struct NodeGraphExample {
     user_state: MyGraphState,
 }
 
-impl Default for NodeGraphExample {
-    fn default() -> Self {
-        Self {
-            state: GraphEditorState::new(1.0),
-            user_state: MyGraphState::default(),
-        }
-    }
-}
 #[cfg(feature = "persistence")]
 const PERSISTENCE_KEY: &str = "egui_node_graph";
 
@@ -368,7 +361,7 @@ impl NodeGraphExample {
         let state = cc
             .storage
             .and_then(|storage| eframe::get_value(storage, PERSISTENCE_KEY))
-            .unwrap_or_else(|| GraphEditorState::new(0.0));
+            .unwrap_or_default();
         Self {
             state,
             user_state: MyGraphState::default(),