Add test

Author: moffatman

lib/web_ui/test/engine/pointer_binding_test.dart

@@ -726,6 +726,79 @@ void testMain() {
     },
   );
 
+  _testEach<_ButtonedEventMixin>(
+    <_ButtonedEventMixin>[
+      if (!isIosSafari) _PointerEventContext(),
+      if (!isIosSafari) _MouseEventContext(),
+    ],
+    'does set pointer device kind based on delta precision',
+    (_ButtonedEventMixin context) {
+      PointerBinding.instance!.debugOverrideDetector(context);
+      final List<ui.PointerDataPacket> packets = <ui.PointerDataPacket>[];
+      ui.window.onPointerDataPacket = (ui.PointerDataPacket packet) {
+        packets.add(packet);
+      };
+
+      glassPane.dispatchEvent(context.wheel(
+        buttons: 0,
+        clientX: 10,
+        clientY: 10,
+        deltaX: 10,
+        deltaY: 10,
+      ));
+
+      glassPane.dispatchEvent(context.wheel(
+        buttons: 0,
+        clientX: 10,
+        clientY: 10,
+        deltaX: 0,
+        deltaY: 120,
+      ));
+
+      expect(packets, hasLength(2));
+
+      // An add will be synthesized.
+      expect(packets[0].data, hasLength(2));
+      expect(packets[0].data[0].change, equals(ui.PointerChange.add));
+      expect(packets[0].data[0].pointerIdentifier, equals(0));
+      expect(packets[0].data[0].synthesized, isTrue);
+      expect(packets[0].data[0].physicalX, equals(10.0 * dpi));
+      expect(packets[0].data[0].physicalY, equals(10.0 * dpi));
+      expect(packets[0].data[0].physicalDeltaX, equals(0.0));
+      expect(packets[0].data[0].physicalDeltaY, equals(0.0));
+      // Because the delta is not in increments of 120, it will be a trackpad event.
+      expect(packets[0].data[1].change, equals(ui.PointerChange.hover));
+      expect(
+          packets[0].data[1].signalKind, equals(ui.PointerSignalKind.scroll));
+      expect(
+          packets[0].data[1].kind, equals(ui.PointerDeviceKind.trackpad));
+      expect(packets[0].data[1].pointerIdentifier, equals(0));
+      expect(packets[0].data[1].synthesized, isFalse);
+      expect(packets[0].data[1].physicalX, equals(10.0 * dpi));
+      expect(packets[0].data[1].physicalY, equals(10.0 * dpi));
+      expect(packets[0].data[1].physicalDeltaX, equals(0.0));
+      expect(packets[0].data[1].physicalDeltaY, equals(0.0));
+      expect(packets[0].data[1].scrollDeltaX, equals(10.0));
+      expect(packets[0].data[1].scrollDeltaY, equals(10.0));
+
+      // Because the delta is in increments of 120, it will be a mouse event.
+      expect(packets[1].data, hasLength(1));
+      expect(packets[1].data[0].change, equals(ui.PointerChange.hover));
+      expect(
+          packets[1].data[0].signalKind, equals(ui.PointerSignalKind.scroll));
+      expect(
+          packets[1].data[0].kind, equals(ui.PointerDeviceKind.mouse));
+      expect(packets[1].data[0].pointerIdentifier, equals(0));
+      expect(packets[1].data[0].synthesized, isFalse);
+      expect(packets[1].data[0].physicalX, equals(10.0 * dpi));
+      expect(packets[1].data[0].physicalY, equals(10.0 * dpi));
+      expect(packets[1].data[0].physicalDeltaX, equals(0.0));
+      expect(packets[1].data[0].physicalDeltaY, equals(0.0));
+      expect(packets[1].data[0].scrollDeltaX, equals(0.0));
+      expect(packets[1].data[0].scrollDeltaY, equals(120.0));
+    },
+  );
+
   _testEach<_ButtonedEventMixin>(
     <_ButtonedEventMixin>[
       if (!isIosSafari) _PointerEventContext(),