Ported examples 00 and 01 to proc macro interface.

lib/ui/src/interaction.rs

@@ -114,7 +114,7 @@ impl PointerRouter {
 
         match event.kind {
             PointerEventKind::Move => {
-                if let Some(target) = hit_target.clone() {
+                if let Some(target) = self.pressed.clone().or(hit_target.clone()) {
                     routed.push(RoutedPointerEvent {
                         kind: RoutedPointerEventKind::Move,
                         target,
@@ -314,6 +314,36 @@ mod tests {
         );
     }
 
+    #[test]
+    fn router_prefers_pressed_target_on_pointer_move() {
+        let mut router = PointerRouter::new();
+        let tree = interaction_tree();
+        let _ = router.route(
+            &tree,
+            PointerEvent::new(
+                0,
+                Point::new(20.0, 20.0),
+                PointerEventKind::Down {
+                    button: PointerButton::Primary,
+                },
+            ),
+        );
+        let routed = router.route(
+            &tree,
+            PointerEvent::new(0, Point::new(160.0, 20.0), PointerEventKind::Move),
+        );
+
+        assert!(
+            routed
+                .iter()
+                .any(|event| event.kind == RoutedPointerEventKind::Move)
+        );
+        assert_eq!(
+            routed.last().unwrap().target.element_id,
+            Some(ElementId::new(1))
+        );
+    }
+
     #[test]
     fn router_routes_scroll_to_deepest_hover_target() {
         let mut router = PointerRouter::new();