dom/events/Touch.cpp

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #include "mozilla/dom/Touch.h"
   8
   9 #include "mozilla/dom/EventTarget.h"
  10 #include "mozilla/dom/TouchEvent.h"
  11 #include "nsContentUtils.h"
  12 #include "nsIContent.h"
  13
  14 namespace mozilla::dom {
  15
  16 // static
  17 already_AddRefed<Touch> Touch::Constructor(const GlobalObject& aGlobal,
  18                                            const TouchInit& aParam) {
  19   // Annoyingly many parameters, make sure the ordering is the same as in the
  20   // Touch constructor.
  21   RefPtr<Touch> touch = new Touch(
  22       aParam.mTarget, aParam.mIdentifier, aParam.mPageX, aParam.mPageY,
  23       aParam.mScreenX, aParam.mScreenY, aParam.mClientX, aParam.mClientY,
  24       aParam.mRadiusX, aParam.mRadiusY, aParam.mRotationAngle, aParam.mForce);
  25   return touch.forget();
  26 }
  27
  28 Touch::Touch(EventTarget* aTarget, int32_t aIdentifier, int32_t aPageX,
  29              int32_t aPageY, int32_t aScreenX, int32_t aScreenY,
  30              int32_t aClientX, int32_t aClientY, int32_t aRadiusX,
  31              int32_t aRadiusY, float aRotationAngle, float aForce)
  32     : mIsTouchEventSuppressed(false) {
  33   mTarget = aTarget;
  34   mOriginalTarget = aTarget;
  35   mIdentifier = aIdentifier;
  36   mPagePoint = CSSIntPoint(aPageX, aPageY);
  37   mScreenPoint = CSSIntPoint(aScreenX, aScreenY);
  38   mClientPoint = CSSIntPoint(aClientX, aClientY);
  39   mRefPoint = LayoutDeviceIntPoint(0, 0);
  40   mPointsInitialized = true;
  41   mRadius.x = aRadiusX;
  42   mRadius.y = aRadiusY;
  43   mRotationAngle = aRotationAngle;
  44   mForce = aForce;
  45
  46   mChanged = false;
  47   mMessage = 0;
  48   nsJSContext::LikelyShortLivingObjectCreated();
  49 }
  50
  51 Touch::Touch(int32_t aIdentifier, LayoutDeviceIntPoint aPoint,
  52              LayoutDeviceIntPoint aRadius, float aRotationAngle, float aForce)
  53     : mIsTouchEventSuppressed(false) {
  54   mIdentifier = aIdentifier;
  55   mPagePoint = CSSIntPoint(0, 0);
  56   mScreenPoint = CSSIntPoint(0, 0);
  57   mClientPoint = CSSIntPoint(0, 0);
  58   mRefPoint = aPoint;
  59   mPointsInitialized = false;
  60   mRadius = aRadius;
  61   mRotationAngle = aRotationAngle;
  62   mForce = aForce;
  63
  64   mChanged = false;
  65   mMessage = 0;
  66   nsJSContext::LikelyShortLivingObjectCreated();
  67 }
  68
  69 Touch::Touch(int32_t aIdentifier, LayoutDeviceIntPoint aPoint,
  70              LayoutDeviceIntPoint aRadius, float aRotationAngle, float aForce,
  71              int32_t aTiltX, int32_t aTiltY, int32_t aTwist)
  72     : Touch(aIdentifier, aPoint, aRadius, aRotationAngle, aForce) {
  73   tiltX = aTiltX;
  74   tiltY = aTiltY;
  75   twist = aTwist;
  76 }
  77
  78 Touch::Touch(const Touch& aOther)
  79     : mOriginalTarget(aOther.mOriginalTarget),
  80       mTarget(aOther.mTarget),
  81       mRefPoint(aOther.mRefPoint),
  82       mChanged(aOther.mChanged),
  83       mIsTouchEventSuppressed(aOther.mIsTouchEventSuppressed),
  84       mMessage(aOther.mMessage),
  85       mIdentifier(aOther.mIdentifier),
  86       mPagePoint(aOther.mPagePoint),
  87       mClientPoint(aOther.mClientPoint),
  88       mScreenPoint(aOther.mScreenPoint),
  89       mRadius(aOther.mRadius),
  90       mRotationAngle(aOther.mRotationAngle),
  91       mForce(aOther.mForce),
  92       mPointsInitialized(aOther.mPointsInitialized) {
  93   nsJSContext::LikelyShortLivingObjectCreated();
  94 }
  95
  96 Touch::~Touch() = default;
  97
  98 // static
  99 bool Touch::PrefEnabled(JSContext* aCx, JSObject* aGlobal) {
 100   return TouchEvent::PrefEnabled(aCx, aGlobal);
 101 }
 102
 103 NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(Touch, mTarget, mOriginalTarget)
 104
 105 NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(Touch)
 106   NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
 107   NS_INTERFACE_MAP_ENTRY(nsISupports)
 108 NS_INTERFACE_MAP_END
 109
 110 NS_IMPL_CYCLE_COLLECTING_ADDREF(Touch)
 111 NS_IMPL_CYCLE_COLLECTING_RELEASE(Touch)
 112
 113 static EventTarget* FindFirstNonChromeOnlyAccessContent(EventTarget* aTarget) {
 114   nsIContent* content = nsIContent::FromEventTargetOrNull(aTarget);
 115   if (content && content->ChromeOnlyAccess() &&
 116       !nsContentUtils::LegacyIsCallerNativeCode() &&
 117       !nsContentUtils::CanAccessNativeAnon()) {
 118     return content->FindFirstNonChromeOnlyAccessContent();
 119   }
 120
 121   return aTarget;
 122 }
 123
 124 EventTarget* Touch::GetTarget() const {
 125   return FindFirstNonChromeOnlyAccessContent(mTarget);
 126 }
 127
 128 EventTarget* Touch::GetOriginalTarget() const {
 129   return FindFirstNonChromeOnlyAccessContent(mOriginalTarget);
 130 }
 131
 132 int32_t Touch::ScreenX(CallerType aCallerType) const {
 133   if (nsContentUtils::ShouldResistFingerprinting(aCallerType, GetParentObject(),
 134                                                  RFPTarget::TouchEvents)) {
 135     return ClientX();
 136   }
 137
 138   return mScreenPoint.x;
 139 }
 140
 141 int32_t Touch::ScreenY(CallerType aCallerType) const {
 142   if (nsContentUtils::ShouldResistFingerprinting(aCallerType, GetParentObject(),
 143                                                  RFPTarget::TouchEvents)) {
 144     return ClientY();
 145   }
 146
 147   return mScreenPoint.y;
 148 }
 149
 150 int32_t Touch::RadiusX(CallerType aCallerType) const {
 151   if (nsContentUtils::ShouldResistFingerprinting(aCallerType, GetParentObject(),
 152                                                  RFPTarget::TouchEvents)) {
 153     return 0;
 154   }
 155
 156   return mRadius.x;
 157 }
 158
 159 int32_t Touch::RadiusY(CallerType aCallerType) const {
 160   if (nsContentUtils::ShouldResistFingerprinting(aCallerType, GetParentObject(),
 161                                                  RFPTarget::TouchEvents)) {
 162     return 0;
 163   }
 164
 165   return mRadius.y;
 166 }
 167
 168 float Touch::RotationAngle(CallerType aCallerType) const {
 169   if (nsContentUtils::ShouldResistFingerprinting(aCallerType, GetParentObject(),
 170                                                  RFPTarget::TouchEvents)) {
 171     return 0.0f;
 172   }
 173
 174   return mRotationAngle;
 175 }
 176
 177 float Touch::Force(CallerType aCallerType) const {
 178   if (nsContentUtils::ShouldResistFingerprinting(aCallerType, GetParentObject(),
 179                                                  RFPTarget::TouchEvents)) {
 180     return 0.0f;
 181   }
 182
 183   return mForce;
 184 }
 185
 186 void Touch::InitializePoints(nsPresContext* aPresContext, WidgetEvent* aEvent) {
 187   if (mPointsInitialized) {
 188     return;
 189   }
 190   mClientPoint =
 191       Event::GetClientCoords(aPresContext, aEvent, mRefPoint, mClientPoint);
 192   mPagePoint =
 193       Event::GetPageCoords(aPresContext, aEvent, mRefPoint, mClientPoint);
 194   mScreenPoint =
 195       Event::GetScreenCoords(aPresContext, aEvent, mRefPoint).extract();
 196   mPointsInitialized = true;
 197 }
 198
 199 void Touch::SetTouchTarget(EventTarget* aTarget) {
 200   mOriginalTarget = aTarget;
 201   mTarget = aTarget;
 202 }
 203
 204 bool Touch::Equals(Touch* aTouch) const {
 205   return mRefPoint == aTouch->mRefPoint && mForce == aTouch->mForce &&
 206          mRotationAngle == aTouch->mRotationAngle &&
 207          mRadius.x == aTouch->mRadius.x && mRadius.y == aTouch->mRadius.y;
 208 }
 209
 210 void Touch::SetSameAs(const Touch* aTouch) {
 211   mRefPoint = aTouch->mRefPoint;
 212   mForce = aTouch->mForce;
 213   mRotationAngle = aTouch->mRotationAngle;
 214   mRadius.x = aTouch->mRadius.x;
 215   mRadius.y = aTouch->mRadius.y;
 216 }
 217
 218 JSObject* Touch::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto) {
 219   return Touch_Binding::Wrap(aCx, this, aGivenProto);
 220 }
 221
 222 // Parent ourselves to the global of the target. This achieves the desirable
 223 // effects of parenting to the target, but avoids making the touch inaccessible
 224 // when the target happens to be NAC and therefore reflected into the XBL scope.
 225 nsIGlobalObject* Touch::GetParentObject() const {
 226   if (!mOriginalTarget) {
 227     return nullptr;
 228   }
 229   return mOriginalTarget->GetOwnerGlobal();
 230 }
 231
 232 }  // namespace mozilla::dom