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 "nsGlobalWindow.h"
  12 #include "nsContentUtils.h"
  13 #include "nsIContent.h"
  14
  15 namespace mozilla::dom {
  16
  17 // static
  18 already_AddRefed<Touch> Touch::Constructor(const GlobalObject& aGlobal,
  19                                            const TouchInit& aParam) {
  20   // Annoyingly many parameters, make sure the ordering is the same as in the
  21   // Touch constructor.
  22   RefPtr<Touch> touch = new Touch(
  23       aParam.mTarget, aParam.mIdentifier, aParam.mPageX, aParam.mPageY,
  24       aParam.mScreenX, aParam.mScreenY, aParam.mClientX, aParam.mClientY,
  25       aParam.mRadiusX, aParam.mRadiusY, aParam.mRotationAngle, aParam.mForce);
  26   return touch.forget();
  27 }
  28
  29 Touch::Touch(EventTarget* aTarget, int32_t aIdentifier, int32_t aPageX,
  30              int32_t aPageY, int32_t aScreenX, int32_t aScreenY,
  31              int32_t aClientX, int32_t aClientY, int32_t aRadiusX,
  32              int32_t aRadiusY, float aRotationAngle, float aForce)
  33     : mIsTouchEventSuppressed(false) {
  34   mTarget = aTarget;
  35   mOriginalTarget = aTarget;
  36   mIdentifier = aIdentifier;
  37   mPagePoint = CSSIntPoint(aPageX, aPageY);
  38   mScreenPoint = CSSIntPoint(aScreenX, aScreenY);
  39   mClientPoint = CSSIntPoint(aClientX, aClientY);
  40   mRefPoint = LayoutDeviceIntPoint(0, 0);
  41   mPointsInitialized = true;
  42   mRadius.x = aRadiusX;
  43   mRadius.y = aRadiusY;
  44   mRotationAngle = aRotationAngle;
  45   mForce = aForce;
  46
  47   mChanged = false;
  48   mMessage = 0;
  49   nsJSContext::LikelyShortLivingObjectCreated();
  50 }
  51
  52 Touch::Touch(int32_t aIdentifier, LayoutDeviceIntPoint aPoint,
  53              LayoutDeviceIntPoint aRadius, float aRotationAngle, float aForce)
  54     : mIsTouchEventSuppressed(false) {
  55   mIdentifier = aIdentifier;
  56   mPagePoint = CSSIntPoint(0, 0);
  57   mScreenPoint = CSSIntPoint(0, 0);
  58   mClientPoint = CSSIntPoint(0, 0);
  59   mRefPoint = aPoint;
  60   mPointsInitialized = false;
  61   mRadius = aRadius;
  62   mRotationAngle = aRotationAngle;
  63   mForce = aForce;
  64
  65   mChanged = false;
  66   mMessage = 0;
  67   nsJSContext::LikelyShortLivingObjectCreated();
  68 }
  69
  70 Touch::Touch(const Touch& aOther)
  71     : mOriginalTarget(aOther.mOriginalTarget),
  72       mTarget(aOther.mTarget),
  73       mRefPoint(aOther.mRefPoint),
  74       mChanged(aOther.mChanged),
  75       mIsTouchEventSuppressed(aOther.mIsTouchEventSuppressed),
  76       mMessage(aOther.mMessage),
  77       mIdentifier(aOther.mIdentifier),
  78       mPagePoint(aOther.mPagePoint),
  79       mClientPoint(aOther.mClientPoint),
  80       mScreenPoint(aOther.mScreenPoint),
  81       mRadius(aOther.mRadius),
  82       mRotationAngle(aOther.mRotationAngle),
  83       mForce(aOther.mForce),
  84       mPointsInitialized(aOther.mPointsInitialized) {
  85   nsJSContext::LikelyShortLivingObjectCreated();
  86 }
  87
  88 Touch::~Touch() = default;
  89
  90 // static
  91 bool Touch::PrefEnabled(JSContext* aCx, JSObject* aGlobal) {
  92   return TouchEvent::PrefEnabled(aCx, aGlobal);
  93 }
  94
  95 NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(Touch, mTarget, mOriginalTarget)
  96
  97 NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(Touch)
  98   NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
  99   NS_INTERFACE_MAP_ENTRY(nsISupports)
 100 NS_INTERFACE_MAP_END
 101
 102 NS_IMPL_CYCLE_COLLECTING_ADDREF(Touch)
 103 NS_IMPL_CYCLE_COLLECTING_RELEASE(Touch)
 104
 105 EventTarget* Touch::GetTarget() const {
 106   nsCOMPtr<nsIContent> content = do_QueryInterface(mTarget);
 107   if (content && content->ChromeOnlyAccess() &&
 108       !nsContentUtils::LegacyIsCallerNativeCode() &&
 109       !nsContentUtils::CanAccessNativeAnon()) {
 110     return content->FindFirstNonChromeOnlyAccessContent();
 111   }
 112
 113   return mTarget;
 114 }
 115
 116 int32_t Touch::ScreenX(CallerType aCallerType) const {
 117   if (nsContentUtils::ResistFingerprinting(aCallerType)) {
 118     return ClientX();
 119   }
 120
 121   return mScreenPoint.x;
 122 }
 123
 124 int32_t Touch::ScreenY(CallerType aCallerType) const {
 125   if (nsContentUtils::ResistFingerprinting(aCallerType)) {
 126     return ClientY();
 127   }
 128
 129   return mScreenPoint.y;
 130 }
 131
 132 int32_t Touch::RadiusX(CallerType aCallerType) const {
 133   if (nsContentUtils::ResistFingerprinting(aCallerType)) {
 134     return 0;
 135   }
 136
 137   return mRadius.x;
 138 }
 139
 140 int32_t Touch::RadiusY(CallerType aCallerType) const {
 141   if (nsContentUtils::ResistFingerprinting(aCallerType)) {
 142     return 0;
 143   }
 144
 145   return mRadius.y;
 146 }
 147
 148 float Touch::RotationAngle(CallerType aCallerType) const {
 149   if (nsContentUtils::ResistFingerprinting(aCallerType)) {
 150     return 0.0f;
 151   }
 152
 153   return mRotationAngle;
 154 }
 155
 156 float Touch::Force(CallerType aCallerType) const {
 157   if (nsContentUtils::ResistFingerprinting(aCallerType)) {
 158     return 0.0f;
 159   }
 160
 161   return mForce;
 162 }
 163
 164 void Touch::InitializePoints(nsPresContext* aPresContext, WidgetEvent* aEvent) {
 165   if (mPointsInitialized) {
 166     return;
 167   }
 168   mClientPoint =
 169       Event::GetClientCoords(aPresContext, aEvent, mRefPoint, mClientPoint);
 170   mPagePoint =
 171       Event::GetPageCoords(aPresContext, aEvent, mRefPoint, mClientPoint);
 172   mScreenPoint = Event::GetScreenCoords(aPresContext, aEvent, mRefPoint);
 173   mPointsInitialized = true;
 174 }
 175
 176 void Touch::SetTouchTarget(EventTarget* aTarget) {
 177   mOriginalTarget = aTarget;
 178   mTarget = aTarget;
 179 }
 180
 181 bool Touch::Equals(Touch* aTouch) const {
 182   return mRefPoint == aTouch->mRefPoint && mForce == aTouch->mForce &&
 183          mRotationAngle == aTouch->mRotationAngle &&
 184          mRadius.x == aTouch->mRadius.x && mRadius.y == aTouch->mRadius.y;
 185 }
 186
 187 JSObject* Touch::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto) {
 188   return Touch_Binding::Wrap(aCx, this, aGivenProto);
 189 }
 190
 191 // Parent ourselves to the global of the target. This achieves the desirable
 192 // effects of parenting to the target, but avoids making the touch inaccessible
 193 // when the target happens to be NAC and therefore reflected into the XBL scope.
 194 nsIGlobalObject* Touch::GetParentObject() {
 195   if (!mOriginalTarget) {
 196     return nullptr;
 197   }
 198   return mOriginalTarget->GetOwnerGlobal();
 199 }
 200
 201 }  // namespace mozilla::dom