gecko/dom/html/HTMLFieldSetElement.cpp

380 lines
11 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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"
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(uint32_t 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->message)) {
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 && formControl->GetType() != NS_FORM_LABEL;
}
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(nsFormSubmission* aFormSubmission)
{
return NS_OK;
}
nsresult
HTMLFieldSetElement::InsertChildAt(nsIContent* aChild, uint32_t aIndex,
bool aNotify)
{
bool firstLegendHasChanged = false;
if (aChild->IsHTML(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->IsHTML(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) {
if (fieldSet->mInvalidElementsCount > 0) {
// The order we call UpdateValidity and adjust mInvalidElementsCount is
// important. We need to first call UpdateValidity in case
// mInvalidElementsCount was 0 before the call and will be incremented to
// 1 and so we need to change state to invalid. After that is done, we
// are free to increment mInvalidElementsCount to the correct amount.
UpdateValidity(false);
mInvalidElementsCount += fieldSet->mInvalidElementsCount - 1;
}
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) {
if (fieldSet->mInvalidElementsCount > 0) {
// The order we update mInvalidElementsCount and call UpdateValidity is
// important. We need to first decrement mInvalidElementsCount and then
// call UpdateValidity, in case mInvalidElementsCount hits 0 in the call
// of UpdateValidity and we have to change state to valid.
mInvalidElementsCount -= fieldSet->mInvalidElementsCount - 1;
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)
{
return HTMLFieldSetElementBinding::Wrap(aCx, this);
}
} // namespace dom
} // namespace mozilla