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-rw-r--r--dom/events/WheelEvent.h82
1 files changed, 82 insertions, 0 deletions
diff --git a/dom/events/WheelEvent.h b/dom/events/WheelEvent.h
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+++ b/dom/events/WheelEvent.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_dom_WheelEvent_h_
+#define mozilla_dom_WheelEvent_h_
+
+#include "mozilla/dom/MouseEvent.h"
+#include "mozilla/dom/WheelEventBinding.h"
+#include "mozilla/EventForwards.h"
+
+namespace mozilla::dom {
+
+class WheelEvent : public MouseEvent {
+ public:
+ WheelEvent(EventTarget* aOwner, nsPresContext* aPresContext,
+ WidgetWheelEvent* aWheelEvent);
+
+ NS_INLINE_DECL_REFCOUNTING_INHERITED(WheelEvent, MouseEvent)
+
+ static already_AddRefed<WheelEvent> Constructor(const GlobalObject& aGlobal,
+ const nsAString& aType,
+ const WheelEventInit& aParam);
+
+ virtual JSObject* WrapObjectInternal(
+ JSContext* aCx, JS::Handle<JSObject*> aGivenProto) override {
+ return WheelEvent_Binding::Wrap(aCx, this, aGivenProto);
+ }
+
+ double DevToCssPixels(double aDevPxValue) const {
+ if (!mAppUnitsPerDevPixel) {
+ return aDevPxValue;
+ }
+ return aDevPxValue * mAppUnitsPerDevPixel / AppUnitsPerCSSPixel();
+ }
+
+ // NOTE: DeltaX(), DeltaY() and DeltaZ() return CSS pixels when deltaMode is
+ // DOM_DELTA_PIXEL. (The internal event's delta values are device pixels
+ // if it's dispatched by widget)
+ double DeltaX(CallerType);
+ double DeltaY(CallerType);
+ double DeltaZ(CallerType);
+ uint32_t DeltaMode(CallerType);
+
+ int32_t WheelDelta(CallerType aCallerType) {
+ int32_t y = WheelDeltaY(aCallerType);
+ return y ? y : WheelDeltaX(aCallerType);
+ }
+
+ static constexpr int32_t kNativeTicksToWheelDelta = 120;
+ static constexpr double kTrustedDeltaToWheelDelta = 3.0;
+
+ int32_t WheelDeltaX(CallerType);
+ int32_t WheelDeltaY(CallerType);
+
+ void InitWheelEvent(const nsAString& aType, bool aCanBubble, bool aCancelable,
+ nsGlobalWindowInner* aView, int32_t aDetail,
+ int32_t aScreenX, int32_t aScreenY, int32_t aClientX,
+ int32_t aClientY, uint16_t aButton,
+ EventTarget* aRelatedTarget,
+ const nsAString& aModifiersList, double aDeltaX,
+ double aDeltaY, double aDeltaZ, uint32_t aDeltaMode);
+
+ protected:
+ ~WheelEvent() = default;
+
+ double ToWebExposedDelta(WidgetWheelEvent&, double aDelta,
+ nscoord aLineOrPageAmount, CallerType);
+
+ private:
+ int32_t mAppUnitsPerDevPixel;
+};
+
+} // namespace mozilla::dom
+
+already_AddRefed<mozilla::dom::WheelEvent> NS_NewDOMWheelEvent(
+ mozilla::dom::EventTarget* aOwner, nsPresContext* aPresContext,
+ mozilla::WidgetWheelEvent* aEvent);
+
+#endif // mozilla_dom_WheelEvent_h_