gecko-dev/dom/html/HTMLOutputElement.cpp

/* -*- 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/HTMLOutputElement.h"

#include "mozAutoDocUpdate.h"
#include "mozilla/EventStates.h"
#include "mozilla/dom/HTMLFormElement.h"
#include "mozilla/dom/HTMLFormSubmission.h"
#include "mozilla/dom/HTMLOutputElementBinding.h"
#include "nsContentUtils.h"
#include "nsDOMTokenList.h"

NS_IMPL_NS_NEW_HTML_ELEMENT_CHECK_PARSER(Output)

namespace mozilla {
namespace dom {

HTMLOutputElement::HTMLOutputElement(already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo,
                                     FromParser aFromParser)
  : nsGenericHTMLFormElement(std::move(aNodeInfo), NS_FORM_OUTPUT)
  , mValueModeFlag(eModeDefault)
  , mIsDoneAddingChildren(!aFromParser)
{
  AddMutationObserver(this);

  // We start out valid and ui-valid (since we have no form).
  AddStatesSilently(NS_EVENT_STATE_VALID | NS_EVENT_STATE_MOZ_UI_VALID);
}

HTMLOutputElement::~HTMLOutputElement()
{
}

NS_IMPL_CYCLE_COLLECTION_INHERITED(HTMLOutputElement,
                                   nsGenericHTMLFormElement,
                                   mValidity,
                                   mTokenList)

NS_IMPL_ISUPPORTS_CYCLE_COLLECTION_INHERITED(HTMLOutputElement,
                                             nsGenericHTMLFormElement,
                                             nsIMutationObserver,
                                             nsIConstraintValidation)

NS_IMPL_ELEMENT_CLONE(HTMLOutputElement)

void
HTMLOutputElement::SetCustomValidity(const nsAString& aError)
{
  nsIConstraintValidation::SetCustomValidity(aError);

  UpdateState(true);
}

NS_IMETHODIMP
HTMLOutputElement::Reset()
{
  mValueModeFlag = eModeDefault;
  return nsContentUtils::SetNodeTextContent(this, mDefaultValue, true);
}

NS_IMETHODIMP
HTMLOutputElement::SubmitNamesValues(HTMLFormSubmission* aFormSubmission)
{
  // The output element is not submittable.
  return NS_OK;
}

bool
HTMLOutputElement::ParseAttribute(int32_t aNamespaceID,
                                  nsAtom* aAttribute,
                                  const nsAString& aValue,
                                  nsIPrincipal* aMaybeScriptedPrincipal,
                                  nsAttrValue& aResult)
{
  if (aNamespaceID == kNameSpaceID_None) {
    if (aAttribute == nsGkAtoms::_for) {
      aResult.ParseAtomArray(aValue);
      return true;
    }
  }

  return nsGenericHTMLFormElement::ParseAttribute(aNamespaceID, aAttribute,
                                                  aValue,
                                                  aMaybeScriptedPrincipal,
                                                  aResult);
}

void
HTMLOutputElement::DoneAddingChildren(bool aHaveNotified)
{
  mIsDoneAddingChildren = true;
}

EventStates
HTMLOutputElement::IntrinsicState() const
{
  EventStates states = nsGenericHTMLFormElement::IntrinsicState();

  // We don't have to call IsCandidateForConstraintValidation()
  // because <output> can't be barred from constraint validation.
  if (IsValid()) {
    states |= NS_EVENT_STATE_VALID;
    if (!mForm || !mForm->HasAttr(kNameSpaceID_None, nsGkAtoms::novalidate)) {
      states |= NS_EVENT_STATE_MOZ_UI_VALID;
    }
  } else {
    states |= NS_EVENT_STATE_INVALID;
    if (!mForm || !mForm->HasAttr(kNameSpaceID_None, nsGkAtoms::novalidate)) {
      states |= NS_EVENT_STATE_MOZ_UI_INVALID;
    }
  }

  return states;
}

nsresult
HTMLOutputElement::BindToTree(nsIDocument* aDocument, nsIContent* aParent,
                              nsIContent* aBindingParent)
{
  nsresult rv = nsGenericHTMLFormElement::BindToTree(aDocument, aParent,
                                                     aBindingParent);
  NS_ENSURE_SUCCESS(rv, rv);

  // Unfortunately, we can actually end up having to change our state
  // as a result of being bound to a tree even from the parser: we
  // might end up a in a novalidate form, and unlike other form
  // controls that on its own is enough to make change ui-valid state.
  // So just go ahead and update our state now.
  UpdateState(false);

  return rv;
}

void
HTMLOutputElement::GetValue(nsAString& aValue)
{
  nsContentUtils::GetNodeTextContent(this, true, aValue);
}

void
HTMLOutputElement::SetValue(const nsAString& aValue, ErrorResult& aRv)
{
  mValueModeFlag = eModeValue;
  aRv = nsContentUtils::SetNodeTextContent(this, aValue, true);
}

void
HTMLOutputElement::SetDefaultValue(const nsAString& aDefaultValue, ErrorResult& aRv)
{
  mDefaultValue = aDefaultValue;
  if (mValueModeFlag == eModeDefault) {
    // We can't pass mDefaultValue, because it'll be truncated when
    // the element's descendants are changed.
    aRv = nsContentUtils::SetNodeTextContent(this, aDefaultValue, true);
  }
}

nsDOMTokenList*
HTMLOutputElement::HtmlFor()
{
  if (!mTokenList) {
    mTokenList = new nsDOMTokenList(this, nsGkAtoms::_for);
  }
  return mTokenList;
}

void HTMLOutputElement::DescendantsChanged()
{
  if (mIsDoneAddingChildren && mValueModeFlag == eModeDefault) {
    nsContentUtils::GetNodeTextContent(this, true, mDefaultValue);
  }
}

// nsIMutationObserver

void HTMLOutputElement::CharacterDataChanged(nsIContent* aContent,
                                             const CharacterDataChangeInfo&)
{
  DescendantsChanged();
}

void HTMLOutputElement::ContentAppended(nsIContent* aFirstNewContent)
{
  DescendantsChanged();
}

void HTMLOutputElement::ContentInserted(nsIContent* aChild)
{
  DescendantsChanged();
}

void HTMLOutputElement::ContentRemoved(nsIContent* aChild,
                                       nsIContent* aPreviousSibling)
{
  DescendantsChanged();
}

JSObject*
HTMLOutputElement::WrapNode(JSContext* aCx, JS::Handle<JSObject*> aGivenProto)
{
  return HTMLOutputElement_Binding::Wrap(aCx, this, aGivenProto);
}

} // namespace dom
} // namespace mozilla