1 files changed, 278 insertions, 0 deletions
diff --git a/layout/style/nsDOMCSSAttrDeclaration.cpp b/layout/style/nsDOMCSSAttrDeclaration.cpp
new file mode 100644
index 0000000000..1381b22d6c
--- /dev/null
+++ b/layout/style/nsDOMCSSAttrDeclaration.cpp
@@ -0,0 +1,278 @@
+/* -*- 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/. */
+
+/* DOM object for element.style */
+
+#include "nsDOMCSSAttrDeclaration.h"
+
+#include "mozilla/dom/Document.h"
+#include "mozilla/dom/Element.h"
+#include "mozilla/dom/SVGElement.h"
+#include "mozilla/dom/MutationEventBinding.h"
+#include "mozilla/layers/ScrollLinkedEffectDetector.h"
+#include "mozilla/DeclarationBlock.h"
+#include "mozilla/InternalMutationEvent.h"
+#include "mozilla/SMILCSSValueType.h"
+#include "mozilla/SMILValue.h"
+#include "mozAutoDocUpdate.h"
+#include "nsWrapperCacheInlines.h"
+#include "nsIFrame.h"
+#include "ActiveLayerTracker.h"
+
+using namespace mozilla;
+using namespace mozilla::dom;
+
+nsDOMCSSAttributeDeclaration::nsDOMCSSAttributeDeclaration(Element* aElement,
+                                                           bool aIsSMILOverride)
+    : mElement(aElement), mIsSMILOverride(aIsSMILOverride) {
+  NS_ASSERTION(aElement, "Inline style for a NULL element?");
+}
+
+nsDOMCSSAttributeDeclaration::~nsDOMCSSAttributeDeclaration() = default;
+
+NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(nsDOMCSSAttributeDeclaration, mElement)
+
+// mElement holds a strong ref to us, so if it's going to be
+// skipped, the attribute declaration can't be part of a garbage
+// cycle.
+NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_BEGIN(nsDOMCSSAttributeDeclaration)
+  if (tmp->mElement && Element::CanSkip(tmp->mElement, true)) {
+    if (tmp->PreservingWrapper()) {
+      tmp->MarkWrapperLive();
+    }
+    return true;
+  }
+  return tmp->HasKnownLiveWrapper();
+NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_END
+
+NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_IN_CC_BEGIN(nsDOMCSSAttributeDeclaration)
+  return tmp->HasKnownLiveWrapper() ||
+         (tmp->mElement && Element::CanSkipInCC(tmp->mElement));
+NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_IN_CC_END
+
+NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_THIS_BEGIN(nsDOMCSSAttributeDeclaration)
+  return tmp->HasKnownLiveWrapper() ||
+         (tmp->mElement && Element::CanSkipThis(tmp->mElement));
+NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_THIS_END
+
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(nsDOMCSSAttributeDeclaration)
+  NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
+NS_INTERFACE_MAP_END_INHERITING(nsDOMCSSDeclaration)
+
+NS_IMPL_CYCLE_COLLECTING_ADDREF(nsDOMCSSAttributeDeclaration)
+NS_IMPL_CYCLE_COLLECTING_RELEASE(nsDOMCSSAttributeDeclaration)
+
+nsresult nsDOMCSSAttributeDeclaration::SetCSSDeclaration(
+    DeclarationBlock* aDecl, MutationClosureData* aClosureData) {
+  NS_ASSERTION(mElement, "Must have Element to set the declaration!");
+
+  // Whenever changing element.style values, aClosureData must be non-null.
+  // SMIL doesn't update Element's attribute values, so closure data isn't
+  // needed.
+  MOZ_ASSERT_IF(!mIsSMILOverride, aClosureData);
+
+  // The closure needs to have been called by now, otherwise we shouldn't be
+  // getting here when the attribute hasn't changed.
+  MOZ_ASSERT_IF(aClosureData && aClosureData->mShouldBeCalled,
+                aClosureData->mWasCalled);
+
+  aDecl->SetDirty();
+  if (mIsSMILOverride) {
+    mElement->SetSMILOverrideStyleDeclaration(*aDecl);
+    return NS_OK;
+  }
+  return mElement->SetInlineStyleDeclaration(*aDecl, *aClosureData);
+}
+
+Document* nsDOMCSSAttributeDeclaration::DocToUpdate() {
+  // We need OwnerDoc() rather than GetUncomposedDoc() because it might
+  // be the BeginUpdate call that inserts mElement into the document.
+  return mElement->OwnerDoc();
+}
+
+DeclarationBlock* nsDOMCSSAttributeDeclaration::GetOrCreateCSSDeclaration(
+    Operation aOperation, DeclarationBlock** aCreated) {
+  MOZ_ASSERT(aOperation != Operation::Modify || aCreated);
+
+  if (!mElement) return nullptr;
+
+  DeclarationBlock* declaration;
+  if (mIsSMILOverride) {
+    declaration = mElement->GetSMILOverrideStyleDeclaration();
+  } else {
+    declaration = mElement->GetInlineStyleDeclaration();
+  }
+
+  if (declaration) {
+    return declaration;
+  }
+
+  if (aOperation != Operation::Modify) {
+    return nullptr;
+  }
+
+  // cannot fail
+  RefPtr<DeclarationBlock> decl = new DeclarationBlock();
+  // Mark the declaration dirty so that it can be reused by the caller.
+  // Normally SetDirty is called later in SetCSSDeclaration.
+  decl->SetDirty();
+#ifdef DEBUG
+  RefPtr<DeclarationBlock> mutableDecl = decl->EnsureMutable();
+  MOZ_ASSERT(mutableDecl == decl);
+#endif
+  decl.swap(*aCreated);
+  return *aCreated;
+}
+
+nsDOMCSSDeclaration::ParsingEnvironment
+nsDOMCSSAttributeDeclaration::GetParsingEnvironment(
+    nsIPrincipal* aSubjectPrincipal) const {
+  return {
+      mElement->GetURLDataForStyleAttr(aSubjectPrincipal),
+      mElement->OwnerDoc()->GetCompatibilityMode(),
+      mElement->OwnerDoc()->CSSLoader(),
+  };
+}
+
+template <typename SetterFunc>
+nsresult nsDOMCSSAttributeDeclaration::SetSMILValueHelper(SetterFunc aFunc) {
+  MOZ_ASSERT(mIsSMILOverride);
+
+  // No need to do the ActiveLayerTracker / ScrollLinkedEffectDetector bits,
+  // since we're in a SMIL animation anyway, no need to try to detect we're a
+  // scripted animation.
+  RefPtr<DeclarationBlock> created;
+  DeclarationBlock* olddecl =
+      GetOrCreateCSSDeclaration(Operation::Modify, getter_AddRefs(created));
+  if (!olddecl) {
+    return NS_ERROR_NOT_AVAILABLE;
+  }
+  mozAutoDocUpdate autoUpdate(DocToUpdate(), true);
+  RefPtr<DeclarationBlock> decl = olddecl->EnsureMutable();
+
+  bool changed = aFunc(*decl);
+
+  if (changed) {
+    // We can pass nullptr as the latter param, since this is
+    // mIsSMILOverride == true case.
+    SetCSSDeclaration(decl, nullptr);
+  }
+  return NS_OK;
+}
+
+nsresult nsDOMCSSAttributeDeclaration::SetSMILValue(
+    const nsCSSPropertyID /*aPropID*/, const SMILValue& aValue) {
+  MOZ_ASSERT(aValue.mType == &SMILCSSValueType::sSingleton,
+             "We should only try setting a CSS value type");
+  return SetSMILValueHelper([&aValue](DeclarationBlock& aDecl) {
+    return SMILCSSValueType::SetPropertyValues(aValue, aDecl);
+  });
+}
+
+nsresult nsDOMCSSAttributeDeclaration::SetSMILValue(
+    const nsCSSPropertyID aPropID, const SVGAnimatedLength& aLength) {
+  return SetSMILValueHelper([aPropID, &aLength](DeclarationBlock& aDecl) {
+    MOZ_ASSERT(aDecl.IsMutable());
+    return SVGElement::UpdateDeclarationBlockFromLength(
+        *aDecl.Raw(), aPropID, aLength, SVGElement::ValToUse::Anim);
+  });
+}
+
+nsresult nsDOMCSSAttributeDeclaration::SetSMILValue(
+    const nsCSSPropertyID /*aPropID*/, const SVGAnimatedPathSegList& aPath) {
+  return SetSMILValueHelper([&aPath](DeclarationBlock& aDecl) {
+    MOZ_ASSERT(aDecl.IsMutable());
+    return SVGElement::UpdateDeclarationBlockFromPath(
+        *aDecl.Raw(), aPath, SVGElement::ValToUse::Anim);
+  });
+}
+
+// Scripted modifications to style.opacity or style.transform (or other
+// transform-like properties, e.g. style.translate, style.rotate, style.scale)
+// could immediately force us into the animated state if heuristics suggest
+// this is a scripted animation.
+//
+// FIXME: This is missing the margin shorthand and the logical versions of
+// the margin properties, see bug 1266287.
+static bool IsActiveLayerProperty(nsCSSPropertyID aPropID) {
+  switch (aPropID) {
+    case eCSSProperty_opacity:
+    case eCSSProperty_transform:
+    case eCSSProperty_translate:
+    case eCSSProperty_rotate:
+    case eCSSProperty_scale:
+    case eCSSProperty_offset_path:
+    case eCSSProperty_offset_distance:
+    case eCSSProperty_offset_rotate:
+    case eCSSProperty_offset_anchor:
+    case eCSSProperty_offset_position:
+      return true;
+    default:
+      return false;
+  }
+}
+
+void nsDOMCSSAttributeDeclaration::SetPropertyValue(
+    const nsCSSPropertyID aPropID, const nsACString& aValue,
+    nsIPrincipal* aSubjectPrincipal, ErrorResult& aRv) {
+  nsDOMCSSDeclaration::SetPropertyValue(aPropID, aValue, aSubjectPrincipal,
+                                        aRv);
+}
+
+static bool IsScrollLinkedEffectiveProperty(const nsCSSPropertyID aPropID) {
+  switch (aPropID) {
+    case eCSSProperty_background_position:
+    case eCSSProperty_background_position_x:
+    case eCSSProperty_background_position_y:
+    case eCSSProperty_transform:
+    case eCSSProperty_translate:
+    case eCSSProperty_rotate:
+    case eCSSProperty_scale:
+    case eCSSProperty_offset_path:
+    case eCSSProperty_offset_distance:
+    case eCSSProperty_offset_rotate:
+    case eCSSProperty_offset_anchor:
+    case eCSSProperty_offset_position:
+    case eCSSProperty_top:
+    case eCSSProperty_left:
+    case eCSSProperty_bottom:
+    case eCSSProperty_right:
+    case eCSSProperty_margin:
+    case eCSSProperty_margin_top:
+    case eCSSProperty_margin_left:
+    case eCSSProperty_margin_bottom:
+    case eCSSProperty_margin_right:
+    case eCSSProperty_margin_inline_start:
+    case eCSSProperty_margin_inline_end:
+    case eCSSProperty_margin_block_start:
+    case eCSSProperty_margin_block_end:
+      return true;
+    default:
+      return false;
+  }
+}
+
+void nsDOMCSSAttributeDeclaration::MutationClosureFunction(
+    void* aData, nsCSSPropertyID aPropID) {
+  auto* data = static_cast<MutationClosureData*>(aData);
+  MOZ_ASSERT(
+      data->mShouldBeCalled,
+      "Did we pass a non-null closure to the style system unnecessarily?");
+  if (data->mWasCalled) {
+    return;
+  }
+  if (IsScrollLinkedEffectiveProperty(aPropID)) {
+    mozilla::layers::ScrollLinkedEffectDetector::PositioningPropertyMutated();
+  }
+  if (IsActiveLayerProperty(aPropID)) {
+    if (nsIFrame* frame = data->mElement->GetPrimaryFrame()) {
+      ActiveLayerTracker::NotifyInlineStyleRuleModified(frame, aPropID);
+    }
+  }
+
+  data->mWasCalled = true;
+  data->mElement->InlineStyleDeclarationWillChange(*data);
+}