Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 178 insertions, 0 deletions

diff --git a/dom/events/WheelEvent.cpp b/dom/events/WheelEvent.cpp
new file mode 100644
index 0000000000..56cfe113ea
--- /dev/null
+++ b/dom/events/WheelEvent.cpp
@@ -0,0 +1,178 @@
+/* -*- 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/MouseEventBinding.h"
+#include "mozilla/dom/WheelEvent.h"
+#include "mozilla/MouseEvents.h"
+#include "prtime.h"
+
+namespace mozilla::dom {
+
+WheelEvent::WheelEvent(EventTarget* aOwner, nsPresContext* aPresContext,
+                       WidgetWheelEvent* aWheelEvent)
+    : MouseEvent(aOwner, aPresContext,
+                 aWheelEvent
+                     ? aWheelEvent
+                     : new WidgetWheelEvent(false, eVoidEvent, nullptr)),
+      mAppUnitsPerDevPixel(0) {
+  if (aWheelEvent) {
+    mEventIsInternal = false;
+    // If the delta mode is pixel, the WidgetWheelEvent's delta values are in
+    // device pixels.  However, JS contents need the delta values in CSS pixels.
+    // We should store the value of mAppUnitsPerDevPixel here because
+    // it might be changed by changing zoom or something.
+    if (aWheelEvent->mDeltaMode == WheelEvent_Binding::DOM_DELTA_PIXEL) {
+      mAppUnitsPerDevPixel = aPresContext->AppUnitsPerDevPixel();
+    }
+  } else {
+    mEventIsInternal = true;
+    mEvent->mRefPoint = LayoutDeviceIntPoint(0, 0);
+    mEvent->AsWheelEvent()->mInputSource =
+        MouseEvent_Binding::MOZ_SOURCE_UNKNOWN;
+  }
+}
+
+void WheelEvent::InitWheelEvent(
+    const nsAString& aType, bool aCanBubble, bool aCancelable,
+    nsGlobalWindowInner* aView, int32_t aDetail, int32_t aScreenX,
+    int32_t aScreenY, int32_t aClientX, int32_t aClientY, uint16_t aButton,
+    EventTarget* aRelatedTarget, const nsAString& aModifiersList,
+    double aDeltaX, double aDeltaY, double aDeltaZ, uint32_t aDeltaMode) {
+  NS_ENSURE_TRUE_VOID(!mEvent->mFlags.mIsBeingDispatched);
+
+  MouseEvent::InitMouseEvent(aType, aCanBubble, aCancelable, aView, aDetail,
+                             aScreenX, aScreenY, aClientX, aClientY, aButton,
+                             aRelatedTarget, aModifiersList);
+
+  WidgetWheelEvent* wheelEvent = mEvent->AsWheelEvent();
+  // When specified by the caller (for JS-created events), don't mess with the
+  // delta mode.
+  wheelEvent->mDeltaModeCheckingState =
+      WidgetWheelEvent::DeltaModeCheckingState::Checked;
+  wheelEvent->mDeltaX = aDeltaX;
+  wheelEvent->mDeltaY = aDeltaY;
+  wheelEvent->mDeltaZ = aDeltaZ;
+  wheelEvent->mDeltaMode = aDeltaMode;
+  wheelEvent->mAllowToOverrideSystemScrollSpeed = false;
+}
+
+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
+            ? 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
+            ? 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->InitWheelEvent(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, aParam.mDeltaZ, aParam.mDeltaMode);
+  e->InitializeExtraMouseEventDictionaryMembers(aParam);
+  e->SetTrusted(trusted);
+  e->SetComposed(aParam.mComposed);
+  return e.forget();
+}
+
+}  // namespace mozilla::dom
+
+using namespace mozilla;
+using namespace mozilla::dom;
+
+already_AddRefed<WheelEvent> NS_NewDOMWheelEvent(EventTarget* aOwner,
+                                                 nsPresContext* aPresContext,
+                                                 WidgetWheelEvent* aEvent) {
+  RefPtr<WheelEvent> it = new WheelEvent(aOwner, aPresContext, aEvent);
+  return it.forget();
+}