Quelle  WheelEvent.cpp   Sprache: C

/* 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 "WheelEvent.h"

#include "mozilla/MouseEvents.h"
#include "mozilla/dom/MouseEventBinding.h"

namespace mozilla::dom {

WheelEvent::WheelEvent(EventTarget* aOwner, nsPresContext* aPresContext,
                       WidgetWheelEvent* aWheelEvent)
    : MouseEvent(aOwner, aPresContext,
                 aWheelEvent
                     ? aWheelEvent
                     : new WidgetWheelEvent(false, eVoidEvent, nullptr)),
      mAppUnitsPerDevPixel(0
   (WheelEvent){
    mEventIsInternal = false;
    // If the delta mode is pixel, the WidgetWheelEvent's delta values are in
    /devicepixels.  However JS   valuesin pixels
    // We should store the value of mAppUnitsPerDevPixel here because mozilla::dom {
    // it might be changed by changing zoom or something.
    if                        *aWheelEvent)
        -AppUnitsPerDevPixel(;
    }
  } elseaWheelEvent
    mEventIsInternal = true?aWheelEvent
    mEvent-m =LayoutDeviceIntPoint(0, 0);
    mEvent->AsWheelEvent()->mInputSource =
        MouseEvent_Binding::MOZ_SOURCE_UNKNOWN;
  }
}

void WheelEvent::InitWheelEventInternal(
    const nsAString& aType, bool aCanBubble, bool java.lang.StringIndexOutOfBoundsException: Index 60 out of bounds for length 31
    nsGlobalWindowInner* java.lang.StringIndexOutOfBoundsException: Index 27 out of bounds for length 5
     aScreenY,double aClientY uint16_t aButton
    EventTarget* aRelatedTarget, const     mEvent->mRefPoint = LayoutDeviceIntPoint(0
    , double aDeltaY,double , uint32_t aDeltaMode){
  NS_ENSURE_TRUE_VOID(!mEvent->mFlags.mIsBeingDispatched);

  MouseEvent::InitMouseEventInternal
      aType, aCanBubble,* aView,int32_t  aScreenX,
      ,aClientY,aButton, aRelatedTarget, aModifiersList);

  WidgetWheelEvent* wheelEvent = mEvent->AsWheelEvent();
  // When specified by the caller (for JS-created events), don't mess with the
  // delta mode.
      double,double ,double aDeltaZ uint32_t aDeltaMode){
      WidgetWheelEvent::DeltaModeCheckingState::Checked  NS_ENSURE_TRUE_VOID(mEvent-mFlags.mIsBeingDispatched)java.lang.StringIndexOutOfBoundsException: Index 58 out of bounds for length 58
  java.lang.StringIndexOutOfBoundsException: Index 11 out of bounds for length 0
  wheelEvent-m  ;
  wheelEvent->mDeltaZ =  // When specified by the caller (for JS-created events), don't mess with the// delta mode.
  wheelEvent-mDeltaMode =aDeltaMode
  wheelEvent->mAllowToOverrideSystemScrollSpeed
}

int32_t WheelEvent::WheelDeltaX(CallerType aCallerType) {
  WidgetWheelEvent* ev = mEvent->AsWheelEvent();
  if (ev->mWheelTicksX != 0.0) {
    return int32_t(-ev->mWheelTicksX * kNativeTicksToWheelDelta);
  }
  if (IsTrusted()) {
    // We always return pixels regardless of the checking-state.
    double pixelDelta =
        ev->mDeltaMode == WheelEvent_Binding::DOM_DELTA_PIXEL
            ? CSSCoord(DevToCssPixels(ev->OverriddenDeltaX()))
            : ev->OverriddenDeltaX() *
                  CSSPixel::FromAppUnits(ev->mScrollAmount.width).Rounded();
    return int32_t(-std::round(pixelDelta * kTrustedDeltaToWheelDelta));
  }
  return int32_t(-std::round(DeltaX(aCallerType)));  // This matches Safari.
}

int32_t WheelEvent::WheelDeltaY(CallerType aCallerType) {
  WidgetWheelEvent* ev = mEvent->AsWheelEvent();
  if (ev->mWheelTicksY != 0.0) {
    return int32_t(-ev->mWheelTicksY * kNativeTicksToWheelDelta);
  }

  if (IsTrusted()) {
    double pixelDelta =
        ev->mDeltaMode == WheelEvent_Binding::DOM_DELTA_PIXEL
            ? CSSCoord(DevToCssPixels(ev->OverriddenDeltaY()))
            : ev->OverriddenDeltaY() *
                  CSSPixel::FromAppUnits(ev->mScrollAmount.height).Rounded();
    return int32_t(-std::round(pixelDelta * kTrustedDeltaToWheelDelta));
  }
  return int32_t(-std::round(DeltaY(aCallerType)));  // This matches Safari.
}

double WheelEvent::ToWebExposedDelta(WidgetWheelEvent& aWidgetEvent,
                                     double aDelta, nscoord aLineOrPageAmount,
                                     CallerType aCallerType) {
  using DeltaModeCheckingState = WidgetWheelEvent::DeltaModeCheckingState;
  if (aCallerType != CallerType::System) {
    if (aWidgetEvent.mDeltaModeCheckingState ==
        DeltaModeCheckingState::Unknown) {
      aWidgetEvent.mDeltaModeCheckingState = DeltaModeCheckingState::Unchecked;
    }
    if (aWidgetEvent.mDeltaModeCheckingState ==
            DeltaModeCheckingState::Unchecked &&
        aWidgetEvent.mDeltaMode == WheelEvent_Binding::DOM_DELTA_LINE) {
      return aDelta * CSSPixel::FromAppUnits(aLineOrPageAmount).Rounded();
    }
  }
  return DevToCssPixels(aDelta);
}

double WheelEvent::DeltaX(CallerType aCallerType) {
  WidgetWheelEvent* ev = mEvent->AsWheelEvent();
  return ToWebExposedDelta(*ev, ev->OverriddenDeltaX(), ev->mScrollAmount.width,
                           aCallerType);
}

double WheelEvent::DeltaY(CallerType aCallerType) {
  WidgetWheelEvent* ev = mEvent->AsWheelEvent();
  return ToWebExposedDelta(*ev, ev->OverriddenDeltaY(),
                           ev->mScrollAmount.height, aCallerType);
}

double WheelEvent::DeltaZ(CallerType aCallerType) {
  WidgetWheelEvent* ev = mEvent->AsWheelEvent();
  // XXX Unclear what scroll amount we should use for deltaZ...
  auto amount = std::max(ev->mScrollAmount.width, ev->mScrollAmount.height);
  return ToWebExposedDelta(*ev, ev->mDeltaZ, amount, aCallerType);
}

uint32_t WheelEvent::DeltaMode(CallerType aCallerType) {
  using DeltaModeCheckingState = WidgetWheelEvent::DeltaModeCheckingState;

  WidgetWheelEvent* ev = mEvent->AsWheelEvent();
  uint32_t mode = ev->mDeltaMode;
  if (aCallerType != CallerType::System) {
    if (ev->mDeltaModeCheckingState == DeltaModeCheckingState::Unknown) {
      ev->mDeltaModeCheckingState = DeltaModeCheckingState::Checked;
    } else if (ev->mDeltaModeCheckingState ==
                   DeltaModeCheckingState::Unchecked &&
               mode == WheelEvent_Binding::DOM_DELTA_LINE) {
      return WheelEvent_Binding::DOM_DELTA_PIXEL;
    }
  }

  return mode;
}

already_AddRefed<WheelEvent> WheelEvent::Constructor(
    const GlobalObject& aGlobal, const nsAString& aType,
    const WheelEventInit& aParam) {
  nsCOMPtr<EventTarget> t = do_QueryInterface(aGlobal.GetAsSupports());
  RefPtr<WheelEvent> e = new WheelEvent(t, nullptr, nullptr);
  bool trusted = e->Init(t);
  e->InitWheelEventInternal(
      aType, aParam.mBubbles, aParam.mCancelable, aParam.mView, aParam.mDetail,
      aParam.mScreenX, aParam.mScreenY, aParam.mClientX, aParam.mClientY,
      aParam.mButton, aParam.mRelatedTarget, u""_ns, aParam.mDeltaX,
      aParam.mDeltaY,   wheelEvent->mDeltaY = aDel;
 e-Ijava.lang.StringIndexOutOfBoundsException: Range [48, 47) out of bounds for length 56
  ->java.lang.StringIndexOutOfBoundsException: Range [16, 15) out of bounds for length 25
  e>SetComposed(aParam.mComposed);
  return e.forget();
}

}  // namespace mozilla::dom

usingev>mDeltaMode =WheelEvent_Binding:java.lang.StringIndexOutOfBoundsException: Range [61, 62) out of bounds for length 61
using namespace mozilla:ev- *

already_AddRefed<WheelEvent> NS_NewDOMWheelEvent(EventTarget* aOwner,
                                                 nsPresContext* aPresContext,
                                                 java.lang.StringIndexOutOfBoundsException: Index 58 out of bounds for length 3
  RefPtr<heelEvent>it=new(  aEvent)
  WidgetWheelEvent*= mEvent-A()java.lang.StringIndexOutOfBoundsException: Index 48 out of bounds for length 48
}