Handle the wheel event in the wasm window

Align the wheel event handling with other events - move the handler to
wasm window and create a C++ wrapper class for the js wheel event.

Fixes: QTBUG-109622
Change-Id: I915e502de7c0784ec9a6745a90ddcda062e91b2b
Reviewed-by: Mikołaj Boc <Mikolaj.Boc@qt.io>
Reviewed-by: Lorn Potter <lorn.potter@gmail.com>
Reviewed-by: Morten Johan Sørvig <morten.sorvig@qt.io>

1 files changed, 19 insertions, 0 deletions

diff --git a/src/plugins/platforms/wasm/qwasmevent.h b/src/plugins/platforms/wasm/qwasmevent.h
index 215d06bae5..e8aea9072e 100644
--- a/src/plugins/platforms/wasm/qwasmevent.h
+++ b/src/plugins/platforms/wasm/qwasmevent.h
@@ -24,6 +24,7 @@ enum class EventType {
     PointerUp,
     PointerEnter,
     PointerLeave,
+    Wheel,
 };
 
 enum class PointerType {
@@ -36,6 +37,8 @@ enum class WindowArea {
     Client,
 };
 
+enum class DeltaMode { Pixel, Line, Page };
+
 namespace KeyboardModifier {
 namespace internal
 {
@@ -203,6 +206,22 @@ struct DragEvent : public MouseEvent
     emscripten::val dataTransfer;
 };
 
+struct WheelEvent : public MouseEvent
+{
+    static std::optional<WheelEvent> fromWeb(emscripten::val webEvent);
+
+    WheelEvent(EventType type, emscripten::val webEvent);
+    ~WheelEvent();
+    WheelEvent(const WheelEvent &other);
+    WheelEvent(WheelEvent &&other);
+    WheelEvent &operator=(const WheelEvent &other);
+    WheelEvent &operator=(WheelEvent &&other);
+
+    DeltaMode deltaMode;
+    bool webkitDirectionInvertedFromDevice;
+    QPoint delta;
+};
+
 QT_END_NAMESPACE
 
 #endif  // QWASMEVENT_H