1 files changed, 319 insertions, 0 deletions
diff --git a/dom/events/MouseEvent.cpp b/dom/events/MouseEvent.cpp
new file mode 100644
index 0000000000..0a50a5c729
--- /dev/null
+++ b/dom/events/MouseEvent.cpp
@@ -0,0 +1,319 @@
+/* -*- 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/MouseEvent.h"
+#include "mozilla/MouseEvents.h"
+#include "mozilla/BasePrincipal.h"
+#include "nsContentUtils.h"
+#include "nsIContent.h"
+#include "nsIScreenManager.h"
+#include "prtime.h"
+
+namespace mozilla::dom {
+
+MouseEvent::MouseEvent(EventTarget* aOwner, nsPresContext* aPresContext,
+                       WidgetMouseEventBase* aEvent)
+    : UIEvent(aOwner, aPresContext,
+              aEvent ? aEvent
+                     : new WidgetMouseEvent(false, eVoidEvent, nullptr,
+                                            WidgetMouseEvent::eReal)) {
+  // There's no way to make this class' ctor allocate an WidgetMouseScrollEvent.
+  // It's not that important, though, since a scroll event is not a real
+  // DOM event.
+
+  WidgetMouseEvent* mouseEvent = mEvent->AsMouseEvent();
+  if (aEvent) {
+    mEventIsInternal = false;
+  } else {
+    mEventIsInternal = true;
+    mEvent->mRefPoint = LayoutDeviceIntPoint(0, 0);
+    mouseEvent->mInputSource = MouseEvent_Binding::MOZ_SOURCE_UNKNOWN;
+  }
+
+  if (mouseEvent) {
+    MOZ_ASSERT(mouseEvent->mReason != WidgetMouseEvent::eSynthesized,
+               "Don't dispatch DOM events from synthesized mouse events");
+    mDetail = mouseEvent->mClickCount;
+  }
+}
+
+void MouseEvent::InitMouseEvent(const nsAString& aType, bool aCanBubble,
+                                bool aCancelable, nsGlobalWindowInner* aView,
+                                int32_t aDetail, int32_t aScreenX,
+                                int32_t aScreenY, int32_t aClientX,
+                                int32_t aClientY, bool aCtrlKey, bool aAltKey,
+                                bool aShiftKey, bool aMetaKey, uint16_t aButton,
+                                EventTarget* aRelatedTarget) {
+  NS_ENSURE_TRUE_VOID(!mEvent->mFlags.mIsBeingDispatched);
+
+  UIEvent::InitUIEvent(aType, aCanBubble, aCancelable, aView, aDetail);
+
+  switch (mEvent->mClass) {
+    case eMouseEventClass:
+    case eMouseScrollEventClass:
+    case eWheelEventClass:
+    case eDragEventClass:
+    case ePointerEventClass:
+    case eSimpleGestureEventClass: {
+      WidgetMouseEventBase* mouseEventBase = mEvent->AsMouseEventBase();
+      mouseEventBase->mRelatedTarget = aRelatedTarget;
+      mouseEventBase->mButton = aButton;
+      mouseEventBase->InitBasicModifiers(aCtrlKey, aAltKey, aShiftKey,
+                                         aMetaKey);
+      mDefaultClientPoint.x = aClientX;
+      mDefaultClientPoint.y = aClientY;
+      mouseEventBase->mRefPoint.x = aScreenX;
+      mouseEventBase->mRefPoint.y = aScreenY;
+
+      WidgetMouseEvent* mouseEvent = mEvent->AsMouseEvent();
+      if (mouseEvent) {
+        mouseEvent->mClickCount = aDetail;
+      }
+      break;
+    }
+    default:
+      break;
+  }
+}
+
+void MouseEvent::InitMouseEvent(const nsAString& aType, bool aCanBubble,
+                                bool aCancelable, nsGlobalWindowInner* aView,
+                                int32_t aDetail, int32_t aScreenX,
+                                int32_t aScreenY, int32_t aClientX,
+                                int32_t aClientY, int16_t aButton,
+                                EventTarget* aRelatedTarget,
+                                const nsAString& aModifiersList) {
+  NS_ENSURE_TRUE_VOID(!mEvent->mFlags.mIsBeingDispatched);
+
+  Modifiers modifiers = ComputeModifierState(aModifiersList);
+
+  InitMouseEvent(
+      aType, aCanBubble, aCancelable, aView, aDetail, aScreenX, aScreenY,
+      aClientX, aClientY, (modifiers & MODIFIER_CONTROL) != 0,
+      (modifiers & MODIFIER_ALT) != 0, (modifiers & MODIFIER_SHIFT) != 0,
+      (modifiers & MODIFIER_META) != 0, aButton, aRelatedTarget);
+
+  switch (mEvent->mClass) {
+    case eMouseEventClass:
+    case eMouseScrollEventClass:
+    case eWheelEventClass:
+    case eDragEventClass:
+    case ePointerEventClass:
+    case eSimpleGestureEventClass:
+      mEvent->AsInputEvent()->mModifiers = modifiers;
+      return;
+    default:
+      MOZ_CRASH("There is no space to store the modifiers");
+  }
+}
+
+void MouseEvent::InitializeExtraMouseEventDictionaryMembers(
+    const MouseEventInit& aParam) {
+  InitModifiers(aParam);
+  mEvent->AsMouseEventBase()->mButtons = aParam.mButtons;
+  mMovementPoint.x = aParam.mMovementX;
+  mMovementPoint.y = aParam.mMovementY;
+}
+
+already_AddRefed<MouseEvent> MouseEvent::Constructor(
+    const GlobalObject& aGlobal, const nsAString& aType,
+    const MouseEventInit& aParam) {
+  nsCOMPtr<EventTarget> t = do_QueryInterface(aGlobal.GetAsSupports());
+  RefPtr<MouseEvent> e = new MouseEvent(t, nullptr, nullptr);
+  bool trusted = e->Init(t);
+  e->InitMouseEvent(aType, aParam.mBubbles, aParam.mCancelable, aParam.mView,
+                    aParam.mDetail, aParam.mScreenX, aParam.mScreenY,
+                    aParam.mClientX, aParam.mClientY, aParam.mCtrlKey,
+                    aParam.mAltKey, aParam.mShiftKey, aParam.mMetaKey,
+                    aParam.mButton, aParam.mRelatedTarget);
+  e->InitializeExtraMouseEventDictionaryMembers(aParam);
+  e->SetTrusted(trusted);
+  e->SetComposed(aParam.mComposed);
+  return e.forget();
+}
+
+void MouseEvent::InitNSMouseEvent(const nsAString& aType, bool aCanBubble,
+                                  bool aCancelable, nsGlobalWindowInner* aView,
+                                  int32_t aDetail, int32_t aScreenX,
+                                  int32_t aScreenY, int32_t aClientX,
+                                  int32_t aClientY, bool aCtrlKey, bool aAltKey,
+                                  bool aShiftKey, bool aMetaKey,
+                                  uint16_t aButton, EventTarget* aRelatedTarget,
+                                  float aPressure, uint16_t aInputSource) {
+  NS_ENSURE_TRUE_VOID(!mEvent->mFlags.mIsBeingDispatched);
+
+  MouseEvent::InitMouseEvent(aType, aCanBubble, aCancelable, aView, aDetail,
+                             aScreenX, aScreenY, aClientX, aClientY, aCtrlKey,
+                             aAltKey, aShiftKey, aMetaKey, aButton,
+                             aRelatedTarget);
+
+  WidgetMouseEventBase* mouseEventBase = mEvent->AsMouseEventBase();
+  mouseEventBase->mPressure = aPressure;
+  mouseEventBase->mInputSource = aInputSource;
+}
+
+void MouseEvent::PreventClickEvent() {
+  if (WidgetMouseEvent* mouseEvent = mEvent->AsMouseEvent()) {
+    mouseEvent->mClickEventPrevented = true;
+  }
+}
+
+bool MouseEvent::ClickEventPrevented() {
+  if (WidgetMouseEvent* mouseEvent = mEvent->AsMouseEvent()) {
+    return mouseEvent->mClickEventPrevented;
+  }
+  return false;
+}
+
+int16_t MouseEvent::Button() {
+  switch (mEvent->mClass) {
+    case eMouseEventClass:
+    case eMouseScrollEventClass:
+    case eWheelEventClass:
+    case eDragEventClass:
+    case ePointerEventClass:
+    case eSimpleGestureEventClass:
+      return mEvent->AsMouseEventBase()->mButton;
+    default:
+      NS_WARNING("Tried to get mouse mButton for non-mouse event!");
+      return MouseButton::ePrimary;
+  }
+}
+
+uint16_t MouseEvent::Buttons() {
+  switch (mEvent->mClass) {
+    case eMouseEventClass:
+    case eMouseScrollEventClass:
+    case eWheelEventClass:
+    case eDragEventClass:
+    case ePointerEventClass:
+    case eSimpleGestureEventClass:
+      return mEvent->AsMouseEventBase()->mButtons;
+    default:
+      MOZ_CRASH("Tried to get mouse buttons for non-mouse event!");
+  }
+}
+
+already_AddRefed<EventTarget> MouseEvent::GetRelatedTarget() {
+  nsCOMPtr<EventTarget> relatedTarget;
+  switch (mEvent->mClass) {
+    case eMouseEventClass:
+    case eMouseScrollEventClass:
+    case eWheelEventClass:
+    case eDragEventClass:
+    case ePointerEventClass:
+    case eSimpleGestureEventClass:
+      relatedTarget = mEvent->AsMouseEventBase()->mRelatedTarget;
+      break;
+    default:
+      break;
+  }
+
+  return EnsureWebAccessibleRelatedTarget(relatedTarget);
+}
+
+CSSIntPoint MouseEvent::ScreenPoint(CallerType aCallerType) const {
+  if (mEvent->mFlags.mIsPositionless) {
+    return {};
+  }
+
+  if (nsContentUtils::ShouldResistFingerprinting(
+          aCallerType, GetParentObject(), RFPTarget::MouseEventScreenPoint)) {
+    // Sanitize to something sort of like client cooords, but not quite
+    // (defaulting to (0,0) instead of our pre-specified client coords).
+    return Event::GetClientCoords(mPresContext, mEvent, mEvent->mRefPoint,
+                                  CSSIntPoint(0, 0));
+  }
+
+  return Event::GetScreenCoords(mPresContext, mEvent, mEvent->mRefPoint)
+      .extract();
+}
+
+LayoutDeviceIntPoint MouseEvent::ScreenPointLayoutDevicePix() const {
+  const CSSIntPoint point = ScreenPoint(CallerType::System);
+  auto scale = mPresContext ? mPresContext->CSSToDevPixelScale()
+                            : CSSToLayoutDeviceScale();
+  return LayoutDeviceIntPoint::Round(point * scale);
+}
+
+DesktopIntPoint MouseEvent::ScreenPointDesktopPix() const {
+  const CSSIntPoint point = ScreenPoint(CallerType::System);
+  auto scale =
+      mPresContext
+          ? mPresContext->CSSToDevPixelScale() /
+                mPresContext->DeviceContext()->GetDesktopToDeviceScale()
+          : CSSToDesktopScale();
+  return DesktopIntPoint::Round(point * scale);
+}
+
+already_AddRefed<nsIScreen> MouseEvent::GetScreen() {
+  nsCOMPtr<nsIScreenManager> screenMgr =
+      do_GetService("@mozilla.org/gfx/screenmanager;1");
+  if (!screenMgr) {
+    return nullptr;
+  }
+  return screenMgr->ScreenForRect(
+      DesktopIntRect(ScreenPointDesktopPix(), DesktopIntSize(1, 1)));
+}
+
+CSSIntPoint MouseEvent::PagePoint() const {
+  if (mEvent->mFlags.mIsPositionless) {
+    return {};
+  }
+
+  if (mPrivateDataDuplicated) {
+    return mPagePoint;
+  }
+
+  return Event::GetPageCoords(mPresContext, mEvent, mEvent->mRefPoint,
+                              mDefaultClientPoint);
+}
+
+CSSIntPoint MouseEvent::ClientPoint() const {
+  if (mEvent->mFlags.mIsPositionless) {
+    return {};
+  }
+
+  return Event::GetClientCoords(mPresContext, mEvent, mEvent->mRefPoint,
+                                mDefaultClientPoint);
+}
+
+CSSIntPoint MouseEvent::OffsetPoint() const {
+  if (mEvent->mFlags.mIsPositionless) {
+    return {};
+  }
+
+  return Event::GetOffsetCoords(mPresContext, mEvent, mEvent->mRefPoint,
+                                mDefaultClientPoint);
+}
+
+bool MouseEvent::AltKey() { return mEvent->AsInputEvent()->IsAlt(); }
+
+bool MouseEvent::CtrlKey() { return mEvent->AsInputEvent()->IsControl(); }
+
+bool MouseEvent::ShiftKey() { return mEvent->AsInputEvent()->IsShift(); }
+
+bool MouseEvent::MetaKey() { return mEvent->AsInputEvent()->IsMeta(); }
+
+float MouseEvent::MozPressure() const {
+  return mEvent->AsMouseEventBase()->mPressure;
+}
+
+uint16_t MouseEvent::InputSource() const {
+  return mEvent->AsMouseEventBase()->mInputSource;
+}
+
+}  // namespace mozilla::dom
+
+using namespace mozilla;
+using namespace mozilla::dom;
+
+already_AddRefed<MouseEvent> NS_NewDOMMouseEvent(EventTarget* aOwner,
+                                                 nsPresContext* aPresContext,
+                                                 WidgetMouseEvent* aEvent) {
+  RefPtr<MouseEvent> it = new MouseEvent(aOwner, aPresContext, aEvent);
+  return it.forget();
+}