gecko-dev/dom/events/Touch.cpp

/* -*- 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/Touch.h"

#include "mozilla/dom/EventTarget.h"
#include "mozilla/dom/TouchEvent.h"
#include "nsContentUtils.h"
#include "nsIContent.h"

namespace mozilla::dom {

// static
already_AddRefed<Touch> Touch::Constructor(const GlobalObject& aGlobal,
                                           const TouchInit& aParam) {
  // Annoyingly many parameters, make sure the ordering is the same as in the
  // Touch constructor.
  RefPtr<Touch> touch = new Touch(
      aParam.mTarget, aParam.mIdentifier, aParam.mPageX, aParam.mPageY,
      aParam.mScreenX, aParam.mScreenY, aParam.mClientX, aParam.mClientY,
      aParam.mRadiusX, aParam.mRadiusY, aParam.mRotationAngle, aParam.mForce);
  return touch.forget();
}

Touch::Touch(EventTarget* aTarget, int32_t aIdentifier, int32_t aPageX,
             int32_t aPageY, int32_t aScreenX, int32_t aScreenY,
             int32_t aClientX, int32_t aClientY, int32_t aRadiusX,
             int32_t aRadiusY, float aRotationAngle, float aForce)
    : mIsTouchEventSuppressed(false) {
  mTarget = aTarget;
  mOriginalTarget = aTarget;
  mIdentifier = aIdentifier;
  mPagePoint = CSSIntPoint(aPageX, aPageY);
  mScreenPoint = CSSIntPoint(aScreenX, aScreenY);
  mClientPoint = CSSIntPoint(aClientX, aClientY);
  mRefPoint = LayoutDeviceIntPoint(0, 0);
  mPointsInitialized = true;
  mRadius.x = aRadiusX;
  mRadius.y = aRadiusY;
  mRotationAngle = aRotationAngle;
  mForce = aForce;

  mChanged = false;
  mMessage = 0;
  nsJSContext::LikelyShortLivingObjectCreated();
}

Touch::Touch(int32_t aIdentifier, LayoutDeviceIntPoint aPoint,
             LayoutDeviceIntPoint aRadius, float aRotationAngle, float aForce)
    : mIsTouchEventSuppressed(false) {
  mIdentifier = aIdentifier;
  mPagePoint = CSSIntPoint(0, 0);
  mScreenPoint = CSSIntPoint(0, 0);
  mClientPoint = CSSIntPoint(0, 0);
  mRefPoint = aPoint;
  mPointsInitialized = false;
  mRadius = aRadius;
  mRotationAngle = aRotationAngle;
  mForce = aForce;

  mChanged = false;
  mMessage = 0;
  nsJSContext::LikelyShortLivingObjectCreated();
}

Touch::Touch(int32_t aIdentifier, LayoutDeviceIntPoint aPoint,
             LayoutDeviceIntPoint aRadius, float aRotationAngle, float aForce,
             int32_t aTiltX, int32_t aTiltY, int32_t aTwist)
    : Touch(aIdentifier, aPoint, aRadius, aRotationAngle, aForce) {
  tiltX = aTiltX;
  tiltY = aTiltY;
  twist = aTwist;
}

Touch::Touch(const Touch& aOther)
    : mOriginalTarget(aOther.mOriginalTarget),
      mTarget(aOther.mTarget),
      mRefPoint(aOther.mRefPoint),
      mChanged(aOther.mChanged),
      mIsTouchEventSuppressed(aOther.mIsTouchEventSuppressed),
      mMessage(aOther.mMessage),
      mIdentifier(aOther.mIdentifier),
      mPagePoint(aOther.mPagePoint),
      mClientPoint(aOther.mClientPoint),
      mScreenPoint(aOther.mScreenPoint),
      mRadius(aOther.mRadius),
      mRotationAngle(aOther.mRotationAngle),
      mForce(aOther.mForce),
      mPointsInitialized(aOther.mPointsInitialized) {
  nsJSContext::LikelyShortLivingObjectCreated();
}

Touch::~Touch() = default;

// static
bool Touch::PrefEnabled(JSContext* aCx, JSObject* aGlobal) {
  return TouchEvent::PrefEnabled(aCx, aGlobal);
}

NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(Touch, mTarget, mOriginalTarget)

NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(Touch)
  NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
  NS_INTERFACE_MAP_ENTRY(nsISupports)
NS_INTERFACE_MAP_END

NS_IMPL_CYCLE_COLLECTING_ADDREF(Touch)
NS_IMPL_CYCLE_COLLECTING_RELEASE(Touch)

static EventTarget* FindFirstNonChromeOnlyAccessContent(EventTarget* aTarget) {
  nsIContent* content = nsIContent::FromEventTargetOrNull(aTarget);
  if (content && content->ChromeOnlyAccess() &&
      !nsContentUtils::LegacyIsCallerNativeCode() &&
      !nsContentUtils::CanAccessNativeAnon()) {
    return content->FindFirstNonChromeOnlyAccessContent();
  }

  return aTarget;
}

EventTarget* Touch::GetTarget() const {
  return FindFirstNonChromeOnlyAccessContent(mTarget);
}

EventTarget* Touch::GetOriginalTarget() const {
  return FindFirstNonChromeOnlyAccessContent(mOriginalTarget);
}

int32_t Touch::ScreenX(CallerType aCallerType) const {
  if (nsContentUtils::ShouldResistFingerprinting(aCallerType, GetParentObject(),
                                                 RFPTarget::TouchEvents)) {
    return ClientX();
  }

  return mScreenPoint.x;
}

int32_t Touch::ScreenY(CallerType aCallerType) const {
  if (nsContentUtils::ShouldResistFingerprinting(aCallerType, GetParentObject(),
                                                 RFPTarget::TouchEvents)) {
    return ClientY();
  }

  return mScreenPoint.y;
}

int32_t Touch::RadiusX(CallerType aCallerType) const {
  if (nsContentUtils::ShouldResistFingerprinting(aCallerType, GetParentObject(),
                                                 RFPTarget::TouchEvents)) {
    return 0;
  }

  return mRadius.x;
}

int32_t Touch::RadiusY(CallerType aCallerType) const {
  if (nsContentUtils::ShouldResistFingerprinting(aCallerType, GetParentObject(),
                                                 RFPTarget::TouchEvents)) {
    return 0;
  }

  return mRadius.y;
}

float Touch::RotationAngle(CallerType aCallerType) const {
  if (nsContentUtils::ShouldResistFingerprinting(aCallerType, GetParentObject(),
                                                 RFPTarget::TouchEvents)) {
    return 0.0f;
  }

  return mRotationAngle;
}

float Touch::Force(CallerType aCallerType) const {
  if (nsContentUtils::ShouldResistFingerprinting(aCallerType, GetParentObject(),
                                                 RFPTarget::TouchEvents)) {
    return 0.0f;
  }

  return mForce;
}

void Touch::InitializePoints(nsPresContext* aPresContext, WidgetEvent* aEvent) {
  if (mPointsInitialized) {
    return;
  }
  mClientPoint = RoundedToInt(
      Event::GetClientCoords(aPresContext, aEvent, mRefPoint, mClientPoint));
  mPagePoint = RoundedToInt(
      Event::GetPageCoords(aPresContext, aEvent, mRefPoint, mClientPoint));
  mScreenPoint = RoundedToInt(
      Event::GetScreenCoords(aPresContext, aEvent, mRefPoint).extract());
  mPointsInitialized = true;
}

void Touch::SetTouchTarget(EventTarget* aTarget) {
  mOriginalTarget = aTarget;
  mTarget = aTarget;
}

bool Touch::Equals(Touch* aTouch) const {
  return mRefPoint == aTouch->mRefPoint && mForce == aTouch->mForce &&
         mRotationAngle == aTouch->mRotationAngle &&
         mRadius.x == aTouch->mRadius.x && mRadius.y == aTouch->mRadius.y;
}

void Touch::SetSameAs(const Touch* aTouch) {
  mRefPoint = aTouch->mRefPoint;
  mForce = aTouch->mForce;
  mRotationAngle = aTouch->mRotationAngle;
  mRadius.x = aTouch->mRadius.x;
  mRadius.y = aTouch->mRadius.y;
}

JSObject* Touch::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto) {
  return Touch_Binding::Wrap(aCx, this, aGivenProto);
}

// Parent ourselves to the global of the target. This achieves the desirable
// effects of parenting to the target, but avoids making the touch inaccessible
// when the target happens to be NAC and therefore reflected into the XBL scope.
nsIGlobalObject* Touch::GetParentObject() const {
  if (!mOriginalTarget) {
    return nullptr;
  }
  return mOriginalTarget->GetOwnerGlobal();
}

}  // namespace mozilla::dom