1 files changed, 370 insertions, 0 deletions
diff --git a/dom/html/HTMLFieldSetElement.cpp b/dom/html/HTMLFieldSetElement.cpp
new file mode 100644
index 000000000..865d3c9cf
--- /dev/null
+++ b/dom/html/HTMLFieldSetElement.cpp
@@ -0,0 +1,370 @@
+/* -*- 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/BasicEvents.h"
+#include "mozilla/EventDispatcher.h"
+#include "mozilla/EventStates.h"
+#include "mozilla/dom/HTMLFieldSetElement.h"
+#include "mozilla/dom/HTMLFieldSetElementBinding.h"
+#include "nsContentList.h"
+#include "nsQueryObject.h"
+
+NS_IMPL_NS_NEW_HTML_ELEMENT(FieldSet)
+
+namespace mozilla {
+namespace dom {
+
+HTMLFieldSetElement::HTMLFieldSetElement(already_AddRefed<mozilla::dom::NodeInfo>& aNodeInfo)
+  : nsGenericHTMLFormElement(aNodeInfo)
+  , mElements(nullptr)
+  , mFirstLegend(nullptr)
+  , mInvalidElementsCount(0)
+{
+  // <fieldset> is always barred from constraint validation.
+  SetBarredFromConstraintValidation(true);
+
+  // We start out enabled and valid.
+  AddStatesSilently(NS_EVENT_STATE_ENABLED | NS_EVENT_STATE_VALID);
+}
+
+HTMLFieldSetElement::~HTMLFieldSetElement()
+{
+  uint32_t length = mDependentElements.Length();
+  for (uint32_t i = 0; i < length; ++i) {
+    mDependentElements[i]->ForgetFieldSet(this);
+  }
+}
+
+// nsISupports
+
+NS_IMPL_CYCLE_COLLECTION_INHERITED(HTMLFieldSetElement, nsGenericHTMLFormElement,
+                                   mValidity, mElements)
+
+NS_IMPL_ADDREF_INHERITED(HTMLFieldSetElement, Element)
+NS_IMPL_RELEASE_INHERITED(HTMLFieldSetElement, Element)
+
+// QueryInterface implementation for HTMLFieldSetElement
+NS_INTERFACE_TABLE_HEAD_CYCLE_COLLECTION_INHERITED(HTMLFieldSetElement)
+  NS_INTERFACE_TABLE_INHERITED(HTMLFieldSetElement,
+                               nsIDOMHTMLFieldSetElement,
+                               nsIConstraintValidation)
+NS_INTERFACE_TABLE_TAIL_INHERITING(nsGenericHTMLFormElement)
+
+NS_IMPL_ELEMENT_CLONE(HTMLFieldSetElement)
+
+
+NS_IMPL_BOOL_ATTR(HTMLFieldSetElement, Disabled, disabled)
+NS_IMPL_STRING_ATTR(HTMLFieldSetElement, Name, name)
+
+// nsIConstraintValidation
+NS_IMPL_NSICONSTRAINTVALIDATION(HTMLFieldSetElement)
+
+bool
+HTMLFieldSetElement::IsDisabledForEvents(EventMessage aMessage)
+{
+  return IsElementDisabledForEvents(aMessage, nullptr);
+}
+
+// nsIContent
+nsresult
+HTMLFieldSetElement::PreHandleEvent(EventChainPreVisitor& aVisitor)
+{
+  // Do not process any DOM events if the element is disabled.
+  aVisitor.mCanHandle = false;
+  if (IsDisabledForEvents(aVisitor.mEvent->mMessage)) {
+    return NS_OK;
+  }
+
+  return nsGenericHTMLFormElement::PreHandleEvent(aVisitor);
+}
+
+nsresult
+HTMLFieldSetElement::AfterSetAttr(int32_t aNameSpaceID, nsIAtom* aName,
+                                  const nsAttrValue* aValue, bool aNotify)
+{
+  if (aNameSpaceID == kNameSpaceID_None && aName == nsGkAtoms::disabled &&
+      nsINode::GetFirstChild()) {
+    if (!mElements) {
+      mElements = new nsContentList(this, MatchListedElements, nullptr, nullptr,
+                                    true);
+    }
+
+    uint32_t length = mElements->Length(true);
+    for (uint32_t i=0; i<length; ++i) {
+      static_cast<nsGenericHTMLFormElement*>(mElements->Item(i))
+        ->FieldSetDisabledChanged(aNotify);
+    }
+  }
+
+  return nsGenericHTMLFormElement::AfterSetAttr(aNameSpaceID, aName,
+                                                aValue, aNotify);
+}
+
+// nsIDOMHTMLFieldSetElement
+
+NS_IMETHODIMP
+HTMLFieldSetElement::GetForm(nsIDOMHTMLFormElement** aForm)
+{
+  return nsGenericHTMLFormElement::GetForm(aForm);
+}
+
+NS_IMETHODIMP
+HTMLFieldSetElement::GetType(nsAString& aType)
+{
+  aType.AssignLiteral("fieldset");
+  return NS_OK;
+}
+
+/* static */
+bool
+HTMLFieldSetElement::MatchListedElements(nsIContent* aContent, int32_t aNamespaceID,
+                                         nsIAtom* aAtom, void* aData)
+{
+  nsCOMPtr<nsIFormControl> formControl = do_QueryInterface(aContent);
+  return formControl;
+}
+
+NS_IMETHODIMP
+HTMLFieldSetElement::GetElements(nsIDOMHTMLCollection** aElements)
+{
+  NS_ADDREF(*aElements = Elements());
+  return NS_OK;
+}
+
+nsIHTMLCollection*
+HTMLFieldSetElement::Elements()
+{
+  if (!mElements) {
+    mElements = new nsContentList(this, MatchListedElements, nullptr, nullptr,
+                                  true);
+  }
+
+  return mElements;
+}
+
+// nsIFormControl
+
+nsresult
+HTMLFieldSetElement::Reset()
+{
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+HTMLFieldSetElement::SubmitNamesValues(HTMLFormSubmission* aFormSubmission)
+{
+  return NS_OK;
+}
+
+nsresult
+HTMLFieldSetElement::InsertChildAt(nsIContent* aChild, uint32_t aIndex,
+                                   bool aNotify)
+{
+  bool firstLegendHasChanged = false;
+
+  if (aChild->IsHTMLElement(nsGkAtoms::legend)) {
+    if (!mFirstLegend) {
+      mFirstLegend = aChild;
+      // We do not want to notify the first time mFirstElement is set.
+    } else {
+      // If mFirstLegend is before aIndex, we do not change it.
+      // Otherwise, mFirstLegend is now aChild.
+      if (int32_t(aIndex) <= IndexOf(mFirstLegend)) {
+        mFirstLegend = aChild;
+        firstLegendHasChanged = true;
+      }
+    }
+  }
+
+  nsresult rv = nsGenericHTMLFormElement::InsertChildAt(aChild, aIndex, aNotify);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  if (firstLegendHasChanged) {
+    NotifyElementsForFirstLegendChange(aNotify);
+  }
+
+  return rv;
+}
+
+void
+HTMLFieldSetElement::RemoveChildAt(uint32_t aIndex, bool aNotify)
+{
+  bool firstLegendHasChanged = false;
+
+  if (mFirstLegend && (GetChildAt(aIndex) == mFirstLegend)) {
+    // If we are removing the first legend we have to found another one.
+    nsIContent* child = mFirstLegend->GetNextSibling();
+    mFirstLegend = nullptr;
+    firstLegendHasChanged = true;
+
+    for (; child; child = child->GetNextSibling()) {
+      if (child->IsHTMLElement(nsGkAtoms::legend)) {
+        mFirstLegend = child;
+        break;
+      }
+    }
+  }
+
+  nsGenericHTMLFormElement::RemoveChildAt(aIndex, aNotify);
+
+  if (firstLegendHasChanged) {
+    NotifyElementsForFirstLegendChange(aNotify);
+  }
+}
+
+void
+HTMLFieldSetElement::AddElement(nsGenericHTMLFormElement* aElement)
+{
+  mDependentElements.AppendElement(aElement);
+
+  // If the element that we are adding aElement is a fieldset, then all the
+  // invalid elements in aElement are also invalid elements of this.
+  HTMLFieldSetElement* fieldSet = FromContent(aElement);
+  if (fieldSet) {
+    for (int32_t i = 0; i < fieldSet->mInvalidElementsCount; i++) {
+      UpdateValidity(false);
+    }
+    return;
+  }
+
+  // We need to update the validity of the fieldset.
+  nsCOMPtr<nsIConstraintValidation> cvElmt = do_QueryObject(aElement);
+  if (cvElmt &&
+      cvElmt->IsCandidateForConstraintValidation() && !cvElmt->IsValid()) {
+    UpdateValidity(false);
+  }
+
+#if DEBUG
+  int32_t debugInvalidElementsCount = 0;
+  for (uint32_t i = 0; i < mDependentElements.Length(); i++) {
+    HTMLFieldSetElement* fieldSet = FromContent(mDependentElements[i]);
+    if (fieldSet) {
+      debugInvalidElementsCount += fieldSet->mInvalidElementsCount;
+      continue;
+    }
+    nsCOMPtr<nsIConstraintValidation>
+      cvElmt = do_QueryObject(mDependentElements[i]);
+    if (cvElmt &&
+        cvElmt->IsCandidateForConstraintValidation() &&
+        !(cvElmt->IsValid())) {
+      debugInvalidElementsCount += 1;
+    }
+  }
+  MOZ_ASSERT(debugInvalidElementsCount == mInvalidElementsCount);
+#endif
+}
+
+void
+HTMLFieldSetElement::RemoveElement(nsGenericHTMLFormElement* aElement)
+{
+  mDependentElements.RemoveElement(aElement);
+
+  // If the element that we are removing aElement is a fieldset, then all the
+  // invalid elements in aElement are also removed from this.
+  HTMLFieldSetElement* fieldSet = FromContent(aElement);
+  if (fieldSet) {
+    for (int32_t i = 0; i < fieldSet->mInvalidElementsCount; i++) {
+      UpdateValidity(true);
+    }
+    return;
+  }
+
+  // We need to update the validity of the fieldset.
+  nsCOMPtr<nsIConstraintValidation> cvElmt = do_QueryObject(aElement);
+  if (cvElmt &&
+      cvElmt->IsCandidateForConstraintValidation() && !cvElmt->IsValid()) {
+    UpdateValidity(true);
+  }
+
+#if DEBUG
+  int32_t debugInvalidElementsCount = 0;
+  for (uint32_t i = 0; i < mDependentElements.Length(); i++) {
+    HTMLFieldSetElement* fieldSet = FromContent(mDependentElements[i]);
+    if (fieldSet) {
+      debugInvalidElementsCount += fieldSet->mInvalidElementsCount;
+      continue;
+    }
+    nsCOMPtr<nsIConstraintValidation>
+      cvElmt = do_QueryObject(mDependentElements[i]);
+    if (cvElmt &&
+        cvElmt->IsCandidateForConstraintValidation() &&
+        !(cvElmt->IsValid())) {
+      debugInvalidElementsCount += 1;
+    }
+  }
+  MOZ_ASSERT(debugInvalidElementsCount == mInvalidElementsCount);
+#endif
+}
+
+void
+HTMLFieldSetElement::NotifyElementsForFirstLegendChange(bool aNotify)
+{
+  /**
+   * NOTE: this could be optimized if only call when the fieldset is currently
+   * disabled.
+   * This should also make sure that mElements is set when we happen to be here.
+   * However, this method shouldn't be called very often in normal use cases.
+   */
+  if (!mElements) {
+    mElements = new nsContentList(this, MatchListedElements, nullptr, nullptr,
+                                  true);
+  }
+
+  uint32_t length = mElements->Length(true);
+  for (uint32_t i = 0; i < length; ++i) {
+    static_cast<nsGenericHTMLFormElement*>(mElements->Item(i))
+      ->FieldSetFirstLegendChanged(aNotify);
+  }
+}
+
+void
+HTMLFieldSetElement::UpdateValidity(bool aElementValidity)
+{
+  if (aElementValidity) {
+    --mInvalidElementsCount;
+  } else {
+    ++mInvalidElementsCount;
+  }
+
+  MOZ_ASSERT(mInvalidElementsCount >= 0);
+
+  // The fieldset validity has just changed if:
+  // - there are no more invalid elements ;
+  // - or there is one invalid elmement and an element just became invalid.
+  if (!mInvalidElementsCount || (mInvalidElementsCount == 1 && !aElementValidity)) {
+    UpdateState(true);
+  }
+
+  // We should propagate the change to the fieldset parent chain.
+  if (mFieldSet) {
+    mFieldSet->UpdateValidity(aElementValidity);
+  }
+
+  return;
+}
+
+EventStates
+HTMLFieldSetElement::IntrinsicState() const
+{
+  EventStates state = nsGenericHTMLFormElement::IntrinsicState();
+
+  if (mInvalidElementsCount) {
+    state |= NS_EVENT_STATE_INVALID;
+  } else {
+    state |= NS_EVENT_STATE_VALID;
+  }
+
+  return state;
+}
+
+JSObject*
+HTMLFieldSetElement::WrapNode(JSContext* aCx, JS::Handle<JSObject*> aGivenProto)
+{
+  return HTMLFieldSetElementBinding::Wrap(aCx, this, aGivenProto);
+}
+
+} // namespace dom
+} // namespace mozilla