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Diffstat (limited to '')
-rw-r--r-- | dom/events/WheelEvent.h | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/dom/events/WheelEvent.h b/dom/events/WheelEvent.h new file mode 100644 index 0000000000..c69764bd57 --- /dev/null +++ b/dom/events/WheelEvent.h @@ -0,0 +1,82 @@ +/* -*- 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_ |