gecko-dev/dom/events/WheelEvent.cpp

114 строки
4.3 KiB
C++

/* -*- 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/. */
#include "mozilla/dom/MouseEventBinding.h"
#include "mozilla/dom/WheelEvent.h"
#include "mozilla/MouseEvents.h"
#include "prtime.h"
namespace mozilla {
namespace dom {
WheelEvent::WheelEvent(EventTarget* aOwner, nsPresContext* aPresContext,
WidgetWheelEvent* aWheelEvent)
: MouseEvent(aOwner, aPresContext,
aWheelEvent
? aWheelEvent
: new WidgetWheelEvent(false, eVoidEvent, nullptr)),
mAppUnitsPerDevPixel(0) {
if (aWheelEvent) {
mEventIsInternal = false;
// If the delta mode is pixel, the WidgetWheelEvent's delta values are in
// device pixels. However, JS contents need the delta values in CSS pixels.
// We should store the value of mAppUnitsPerDevPixel here because
// it might be changed by changing zoom or something.
if (aWheelEvent->mDeltaMode == WheelEvent_Binding::DOM_DELTA_PIXEL) {
mAppUnitsPerDevPixel = aPresContext->AppUnitsPerDevPixel();
}
} else {
mEventIsInternal = true;
mEvent->mTime = PR_Now();
mEvent->mRefPoint = LayoutDeviceIntPoint(0, 0);
mEvent->AsWheelEvent()->mInputSource =
MouseEvent_Binding::MOZ_SOURCE_UNKNOWN;
}
}
void WheelEvent::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) {
NS_ENSURE_TRUE_VOID(!mEvent->mFlags.mIsBeingDispatched);
MouseEvent::InitMouseEvent(aType, aCanBubble, aCancelable, aView, aDetail,
aScreenX, aScreenY, aClientX, aClientY, aButton,
aRelatedTarget, aModifiersList);
WidgetWheelEvent* wheelEvent = mEvent->AsWheelEvent();
wheelEvent->mDeltaX = aDeltaX;
wheelEvent->mDeltaY = aDeltaY;
wheelEvent->mDeltaZ = aDeltaZ;
wheelEvent->mDeltaMode = aDeltaMode;
}
double WheelEvent::DeltaX() {
if (!mAppUnitsPerDevPixel) {
return mEvent->AsWheelEvent()->mDeltaX;
}
return mEvent->AsWheelEvent()->mDeltaX * mAppUnitsPerDevPixel /
AppUnitsPerCSSPixel();
}
double WheelEvent::DeltaY() {
if (!mAppUnitsPerDevPixel) {
return mEvent->AsWheelEvent()->mDeltaY;
}
return mEvent->AsWheelEvent()->mDeltaY * mAppUnitsPerDevPixel /
AppUnitsPerCSSPixel();
}
double WheelEvent::DeltaZ() {
if (!mAppUnitsPerDevPixel) {
return mEvent->AsWheelEvent()->mDeltaZ;
}
return mEvent->AsWheelEvent()->mDeltaZ * mAppUnitsPerDevPixel /
AppUnitsPerCSSPixel();
}
uint32_t WheelEvent::DeltaMode() { return mEvent->AsWheelEvent()->mDeltaMode; }
already_AddRefed<WheelEvent> WheelEvent::Constructor(
const GlobalObject& aGlobal, const nsAString& aType,
const WheelEventInit& aParam, ErrorResult& aRv) {
nsCOMPtr<EventTarget> t = do_QueryInterface(aGlobal.GetAsSupports());
RefPtr<WheelEvent> e = new WheelEvent(t, nullptr, nullptr);
bool trusted = e->Init(t);
e->InitWheelEvent(aType, aParam.mBubbles, aParam.mCancelable, aParam.mView,
aParam.mDetail, aParam.mScreenX, aParam.mScreenY,
aParam.mClientX, aParam.mClientY, aParam.mButton,
aParam.mRelatedTarget, EmptyString(), aParam.mDeltaX,
aParam.mDeltaY, aParam.mDeltaZ, aParam.mDeltaMode);
e->InitializeExtraMouseEventDictionaryMembers(aParam);
e->SetTrusted(trusted);
e->SetComposed(aParam.mComposed);
return e.forget();
}
} // namespace dom
} // namespace mozilla
using namespace mozilla;
using namespace mozilla::dom;
already_AddRefed<WheelEvent> NS_NewDOMWheelEvent(EventTarget* aOwner,
nsPresContext* aPresContext,
WidgetWheelEvent* aEvent) {
RefPtr<WheelEvent> it = new WheelEvent(aOwner, aPresContext, aEvent);
return it.forget();
}