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e74f1cd513
In order to facilitate the movement of code with side-effects called by Element::SetAttr to Element::BeforeSetAttr and Element::AfterSetAttr, Element::AfterSetAttr should have access to the old value of the attribute. This includes information about whether there was previously a value set or not. Accomplishing this involved passing an additional argument through functions that find and change the old attribute value in order to ensure that we can differentiate between an empty old value and an absent old value (attribute was not set). Note that while I tried to ensure that accurate values (and their absence) are reported to Element::AfterSetAttr, I largely ignored SVG. While the old value reported for SVG values should be however accurate the value already being reported to SetAttrAndNotify was, SVG elements do not currently report unset values properly because they will never pass a null pointer to SetAttrAndNotify. MozReview-Commit-ID: K1mha8CNFZP --HG-- extra : rebase_source : 42776eb01451d371e4aebcc17fe3dd112c8d268b
372 lines
10 KiB
C++
372 lines
10 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "mozilla/BasicEvents.h"
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#include "mozilla/EventDispatcher.h"
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#include "mozilla/EventStates.h"
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#include "mozilla/dom/HTMLFieldSetElement.h"
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#include "mozilla/dom/HTMLFieldSetElementBinding.h"
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#include "nsContentList.h"
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#include "nsQueryObject.h"
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NS_IMPL_NS_NEW_HTML_ELEMENT(FieldSet)
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namespace mozilla {
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namespace dom {
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HTMLFieldSetElement::HTMLFieldSetElement(already_AddRefed<mozilla::dom::NodeInfo>& aNodeInfo)
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: nsGenericHTMLFormElement(aNodeInfo, NS_FORM_FIELDSET)
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, mElements(nullptr)
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, mFirstLegend(nullptr)
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, mInvalidElementsCount(0)
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{
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// <fieldset> is always barred from constraint validation.
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SetBarredFromConstraintValidation(true);
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// We start out enabled and valid.
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AddStatesSilently(NS_EVENT_STATE_ENABLED | NS_EVENT_STATE_VALID);
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}
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HTMLFieldSetElement::~HTMLFieldSetElement()
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{
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uint32_t length = mDependentElements.Length();
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for (uint32_t i = 0; i < length; ++i) {
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mDependentElements[i]->ForgetFieldSet(this);
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}
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}
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// nsISupports
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NS_IMPL_CYCLE_COLLECTION_INHERITED(HTMLFieldSetElement, nsGenericHTMLFormElement,
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mValidity, mElements)
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NS_IMPL_ADDREF_INHERITED(HTMLFieldSetElement, Element)
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NS_IMPL_RELEASE_INHERITED(HTMLFieldSetElement, Element)
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// QueryInterface implementation for HTMLFieldSetElement
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NS_INTERFACE_TABLE_HEAD_CYCLE_COLLECTION_INHERITED(HTMLFieldSetElement)
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NS_INTERFACE_TABLE_INHERITED(HTMLFieldSetElement,
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nsIDOMHTMLFieldSetElement,
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nsIConstraintValidation)
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NS_INTERFACE_TABLE_TAIL_INHERITING(nsGenericHTMLFormElement)
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NS_IMPL_ELEMENT_CLONE(HTMLFieldSetElement)
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NS_IMPL_BOOL_ATTR(HTMLFieldSetElement, Disabled, disabled)
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NS_IMPL_STRING_ATTR(HTMLFieldSetElement, Name, name)
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// nsIConstraintValidation
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NS_IMPL_NSICONSTRAINTVALIDATION(HTMLFieldSetElement)
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bool
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HTMLFieldSetElement::IsDisabledForEvents(EventMessage aMessage)
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{
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return IsElementDisabledForEvents(aMessage, nullptr);
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}
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// nsIContent
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nsresult
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HTMLFieldSetElement::GetEventTargetParent(EventChainPreVisitor& aVisitor)
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{
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// Do not process any DOM events if the element is disabled.
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aVisitor.mCanHandle = false;
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if (IsDisabledForEvents(aVisitor.mEvent->mMessage)) {
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return NS_OK;
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}
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return nsGenericHTMLFormElement::GetEventTargetParent(aVisitor);
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}
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nsresult
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HTMLFieldSetElement::AfterSetAttr(int32_t aNameSpaceID, nsIAtom* aName,
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const nsAttrValue* aValue,
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const nsAttrValue* aOldValue, bool aNotify)
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{
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if (aNameSpaceID == kNameSpaceID_None && aName == nsGkAtoms::disabled &&
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nsINode::GetFirstChild()) {
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if (!mElements) {
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mElements = new nsContentList(this, MatchListedElements, nullptr, nullptr,
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true);
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}
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uint32_t length = mElements->Length(true);
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for (uint32_t i=0; i<length; ++i) {
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static_cast<nsGenericHTMLFormElement*>(mElements->Item(i))
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->FieldSetDisabledChanged(aNotify);
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}
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}
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return nsGenericHTMLFormElement::AfterSetAttr(aNameSpaceID, aName,
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aValue, aOldValue, aNotify);
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}
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// nsIDOMHTMLFieldSetElement
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NS_IMETHODIMP
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HTMLFieldSetElement::GetForm(nsIDOMHTMLFormElement** aForm)
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{
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return nsGenericHTMLFormElement::GetForm(aForm);
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}
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NS_IMETHODIMP
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HTMLFieldSetElement::GetType(nsAString& aType)
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{
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aType.AssignLiteral("fieldset");
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return NS_OK;
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}
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/* static */
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bool
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HTMLFieldSetElement::MatchListedElements(Element* aElement, int32_t aNamespaceID,
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nsIAtom* aAtom, void* aData)
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{
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nsCOMPtr<nsIFormControl> formControl = do_QueryInterface(aElement);
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return formControl;
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}
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NS_IMETHODIMP
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HTMLFieldSetElement::GetElements(nsIDOMHTMLCollection** aElements)
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{
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NS_ADDREF(*aElements = Elements());
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return NS_OK;
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}
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nsIHTMLCollection*
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HTMLFieldSetElement::Elements()
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{
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if (!mElements) {
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mElements = new nsContentList(this, MatchListedElements, nullptr, nullptr,
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true);
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}
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return mElements;
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}
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// nsIFormControl
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nsresult
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HTMLFieldSetElement::Reset()
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{
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return NS_OK;
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}
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NS_IMETHODIMP
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HTMLFieldSetElement::SubmitNamesValues(HTMLFormSubmission* aFormSubmission)
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{
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return NS_OK;
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}
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nsresult
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HTMLFieldSetElement::InsertChildAt(nsIContent* aChild, uint32_t aIndex,
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bool aNotify)
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{
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bool firstLegendHasChanged = false;
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if (aChild->IsHTMLElement(nsGkAtoms::legend)) {
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if (!mFirstLegend) {
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mFirstLegend = aChild;
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// We do not want to notify the first time mFirstElement is set.
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} else {
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// If mFirstLegend is before aIndex, we do not change it.
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// Otherwise, mFirstLegend is now aChild.
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if (int32_t(aIndex) <= IndexOf(mFirstLegend)) {
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mFirstLegend = aChild;
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firstLegendHasChanged = true;
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}
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}
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}
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nsresult rv = nsGenericHTMLFormElement::InsertChildAt(aChild, aIndex, aNotify);
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NS_ENSURE_SUCCESS(rv, rv);
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if (firstLegendHasChanged) {
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NotifyElementsForFirstLegendChange(aNotify);
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}
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return rv;
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}
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void
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HTMLFieldSetElement::RemoveChildAt(uint32_t aIndex, bool aNotify)
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{
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bool firstLegendHasChanged = false;
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if (mFirstLegend && (GetChildAt(aIndex) == mFirstLegend)) {
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// If we are removing the first legend we have to found another one.
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nsIContent* child = mFirstLegend->GetNextSibling();
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mFirstLegend = nullptr;
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firstLegendHasChanged = true;
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for (; child; child = child->GetNextSibling()) {
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if (child->IsHTMLElement(nsGkAtoms::legend)) {
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mFirstLegend = child;
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break;
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}
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}
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}
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nsGenericHTMLFormElement::RemoveChildAt(aIndex, aNotify);
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if (firstLegendHasChanged) {
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NotifyElementsForFirstLegendChange(aNotify);
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}
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}
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void
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HTMLFieldSetElement::AddElement(nsGenericHTMLFormElement* aElement)
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{
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mDependentElements.AppendElement(aElement);
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// If the element that we are adding aElement is a fieldset, then all the
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// invalid elements in aElement are also invalid elements of this.
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HTMLFieldSetElement* fieldSet = FromContent(aElement);
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if (fieldSet) {
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for (int32_t i = 0; i < fieldSet->mInvalidElementsCount; i++) {
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UpdateValidity(false);
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}
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return;
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}
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// We need to update the validity of the fieldset.
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nsCOMPtr<nsIConstraintValidation> cvElmt = do_QueryObject(aElement);
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if (cvElmt &&
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cvElmt->IsCandidateForConstraintValidation() && !cvElmt->IsValid()) {
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UpdateValidity(false);
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}
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#if DEBUG
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int32_t debugInvalidElementsCount = 0;
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for (uint32_t i = 0; i < mDependentElements.Length(); i++) {
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HTMLFieldSetElement* fieldSet = FromContent(mDependentElements[i]);
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if (fieldSet) {
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debugInvalidElementsCount += fieldSet->mInvalidElementsCount;
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continue;
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}
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nsCOMPtr<nsIConstraintValidation>
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cvElmt = do_QueryObject(mDependentElements[i]);
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if (cvElmt &&
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cvElmt->IsCandidateForConstraintValidation() &&
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!(cvElmt->IsValid())) {
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debugInvalidElementsCount += 1;
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}
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}
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MOZ_ASSERT(debugInvalidElementsCount == mInvalidElementsCount);
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#endif
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}
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void
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HTMLFieldSetElement::RemoveElement(nsGenericHTMLFormElement* aElement)
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{
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mDependentElements.RemoveElement(aElement);
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// If the element that we are removing aElement is a fieldset, then all the
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// invalid elements in aElement are also removed from this.
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HTMLFieldSetElement* fieldSet = FromContent(aElement);
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if (fieldSet) {
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for (int32_t i = 0; i < fieldSet->mInvalidElementsCount; i++) {
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UpdateValidity(true);
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}
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return;
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}
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// We need to update the validity of the fieldset.
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nsCOMPtr<nsIConstraintValidation> cvElmt = do_QueryObject(aElement);
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if (cvElmt &&
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cvElmt->IsCandidateForConstraintValidation() && !cvElmt->IsValid()) {
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UpdateValidity(true);
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}
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#if DEBUG
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int32_t debugInvalidElementsCount = 0;
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for (uint32_t i = 0; i < mDependentElements.Length(); i++) {
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HTMLFieldSetElement* fieldSet = FromContent(mDependentElements[i]);
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if (fieldSet) {
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debugInvalidElementsCount += fieldSet->mInvalidElementsCount;
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continue;
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}
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nsCOMPtr<nsIConstraintValidation>
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cvElmt = do_QueryObject(mDependentElements[i]);
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if (cvElmt &&
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cvElmt->IsCandidateForConstraintValidation() &&
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!(cvElmt->IsValid())) {
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debugInvalidElementsCount += 1;
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}
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}
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MOZ_ASSERT(debugInvalidElementsCount == mInvalidElementsCount);
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#endif
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}
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void
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HTMLFieldSetElement::NotifyElementsForFirstLegendChange(bool aNotify)
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{
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/**
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* NOTE: this could be optimized if only call when the fieldset is currently
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* disabled.
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* This should also make sure that mElements is set when we happen to be here.
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* However, this method shouldn't be called very often in normal use cases.
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*/
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if (!mElements) {
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mElements = new nsContentList(this, MatchListedElements, nullptr, nullptr,
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true);
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}
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uint32_t length = mElements->Length(true);
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for (uint32_t i = 0; i < length; ++i) {
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static_cast<nsGenericHTMLFormElement*>(mElements->Item(i))
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->FieldSetFirstLegendChanged(aNotify);
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}
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}
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void
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HTMLFieldSetElement::UpdateValidity(bool aElementValidity)
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{
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if (aElementValidity) {
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--mInvalidElementsCount;
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} else {
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++mInvalidElementsCount;
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}
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MOZ_ASSERT(mInvalidElementsCount >= 0);
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// The fieldset validity has just changed if:
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// - there are no more invalid elements ;
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// - or there is one invalid elmement and an element just became invalid.
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if (!mInvalidElementsCount || (mInvalidElementsCount == 1 && !aElementValidity)) {
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UpdateState(true);
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}
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// We should propagate the change to the fieldset parent chain.
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if (mFieldSet) {
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mFieldSet->UpdateValidity(aElementValidity);
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}
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return;
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}
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EventStates
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HTMLFieldSetElement::IntrinsicState() const
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{
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EventStates state = nsGenericHTMLFormElement::IntrinsicState();
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if (mInvalidElementsCount) {
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state |= NS_EVENT_STATE_INVALID;
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} else {
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state |= NS_EVENT_STATE_VALID;
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}
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return state;
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}
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JSObject*
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HTMLFieldSetElement::WrapNode(JSContext* aCx, JS::Handle<JSObject*> aGivenProto)
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{
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return HTMLFieldSetElementBinding::Wrap(aCx, this, aGivenProto);
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}
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} // namespace dom
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} // namespace mozilla
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