fix(core): 🐛 the hit test for the TransformWidget on wrong position

CHANGELOG.md

@@ -31,7 +31,8 @@ Please only add new entries below the [Unreleased](#unreleased---releasedate) he
 
 ### Fixed
 
-- **core**: The size of the `Root` container is too small, which could lead to potential missed hits. (#pr @M-Adoo)
+- **core**: The size of the `Root` container is too small, which could lead to potential missed hits. (#654 @M-Adoo)
+- **core**: The hit test for the `TransformWidget` is not applied at the correct position. (#654 @M-Adoo)
 
 
 ## [0.4.0-alpha.15] - 2024-11-13

core/src/builtin_widgets/transform_widget.rs

@@ -26,7 +26,9 @@ impl WrapRender for TransformWidget {
 
   fn hit_test(&self, host: &dyn Render, ctx: &HitTestCtx, pos: Point) -> HitTest {
     if let Some(t) = self.transform.inverse() {
-      let pos = t.transform_point(pos);
+      let lt = ctx.box_pos().unwrap();
+      let pos = (pos - lt).to_point();
+      let pos = t.transform_point(pos) + lt.to_vector();
       host.hit_test(ctx, pos)
     } else {
       HitTest { hit: false, can_hit_child: false }

core/src/events/dispatcher.rs

@@ -677,7 +677,7 @@ mod tests {
   }
 
   #[test]
-  fn fix_align_test() {
+  fn fix_align_hit_test() {
     reset_test_env!();
     let (expect_hit, w_hit) = split_value(None);
     let mut wnd = TestWindow::new_with_size(
@@ -697,4 +697,26 @@ mod tests {
     assert!(expect_hit.read().is_some());
     assert_eq!(dispatcher.hit_widget(), *expect_hit.read());
   }
+
+  #[test]
+  fn fix_transform_hit() {
+    reset_test_env!();
+    let (expect_hit, w_hit) = split_value(None);
+    let mut wnd = TestWindow::new_with_size(
+      fn_widget! {
+        @MockBox {
+          anchor: Point::new(50., 50.),
+          transform: Transform::rotation(Angle::degrees(45.)),
+          size: Size::new(100., 100.),
+          on_mounted: move |ctx| *$w_hit.write() = Some(ctx.id),
+        }
+      },
+      Size::new(500., 500.),
+    );
+    wnd.draw_frame();
+    let mut dispatcher = wnd.dispatcher.borrow_mut();
+    dispatcher.info.cursor_pos = Point::new(51., 51.);
+    assert!(expect_hit.read().is_some());
+    assert_eq!(dispatcher.hit_widget(), *expect_hit.read());
+  }
 }