зеркало из https://github.com/mozilla/gecko-dev.git
82 строки
3.0 KiB
C++
82 строки
3.0 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_dom_WheelEvent_h_
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#define mozilla_dom_WheelEvent_h_
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#include "mozilla/dom/MouseEvent.h"
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#include "mozilla/dom/WheelEventBinding.h"
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#include "mozilla/EventForwards.h"
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namespace mozilla {
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namespace dom {
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class WheelEvent : public MouseEvent {
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public:
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WheelEvent(EventTarget* aOwner, nsPresContext* aPresContext,
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WidgetWheelEvent* aWheelEvent);
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NS_INLINE_DECL_REFCOUNTING_INHERITED(WheelEvent, MouseEvent)
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static already_AddRefed<WheelEvent> Constructor(const GlobalObject& aGlobal,
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const nsAString& aType,
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const WheelEventInit& aParam);
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virtual JSObject* WrapObjectInternal(
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JSContext* aCx, JS::Handle<JSObject*> aGivenProto) override {
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return WheelEvent_Binding::Wrap(aCx, this, aGivenProto);
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}
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// NOTE: DeltaX(), DeltaY() and DeltaZ() return CSS pixels when deltaMode is
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// DOM_DELTA_PIXEL. (The internal event's delta values are device pixels
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// if it's dispatched by widget)
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double DeltaX(CallerType);
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double DeltaY(CallerType);
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double DeltaZ(CallerType);
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uint32_t DeltaMode(CallerType);
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void InitWheelEvent(const nsAString& aType, bool aCanBubble, bool aCancelable,
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nsGlobalWindowInner* aView, int32_t aDetail,
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int32_t aScreenX, int32_t aScreenY, int32_t aClientX,
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int32_t aClientY, uint16_t aButton,
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EventTarget* aRelatedTarget,
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const nsAString& aModifiersList, double aDeltaX,
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double aDeltaY, double aDeltaZ, uint32_t aDeltaMode);
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protected:
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~WheelEvent() = default;
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double ToWebExposedDelta(const WidgetWheelEvent&, double aDelta, CallerType);
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private:
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int32_t mAppUnitsPerDevPixel;
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enum class DeltaModeCheckingState : uint8_t {
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// Neither deltaMode nor the delta values have been accessed.
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Unknown,
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// The delta values have been accessed, without checking deltaMode first.
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Unchecked,
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// The deltaMode has been checked.
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Checked,
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};
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// For compat reasons, we might expose a DOM_DELTA_LINE event as
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// DOM_DELTA_PIXEL instead. Whether we do that depends on whether the event
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// has been asked for the deltaMode before the deltas. If it has, we assume
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// that the page will correctly handle DOM_DELTA_LINE. This variable tracks
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// that state. See bug 1392460.
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DeltaModeCheckingState mDeltaModeCheckingState =
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DeltaModeCheckingState::Unknown;
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};
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} // namespace dom
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} // namespace mozilla
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already_AddRefed<mozilla::dom::WheelEvent> NS_NewDOMWheelEvent(
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mozilla::dom::EventTarget* aOwner, nsPresContext* aPresContext,
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mozilla::WidgetWheelEvent* aEvent);
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#endif // mozilla_dom_WheelEvent_h_
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