dom/html/HTMLTextAreaElement.cpp
author Masayuki Nakano <masayuki@d-toybox.com>
Fri, 19 May 2017 17:49:41 +0900
changeset 407399 b75c111837a802ceb953dba50a3c5a193d53ca22
parent 407211 74de5283b24d6626067de8d8f043f47b74a4cf6a
child 410041 e8e908b731ad73478a68c39f87427341409ac5fe
permissions -rw-r--r--
Bug 1339543 part 4 Change nsIWidget::ExecuteNativeKeyBinding() to nsIWidget::GetEditCommands() which just retrieves edit commands for the type r=smaug Now, nsIWidget::ExecuteNativeKeyBinding() isn't used by anybody for executing edit commands. Instead, they need array of edit commands for the key combination. So, the method should be renamed to GetEditCommands() and just return edit commands as an array. MozReview-Commit-ID: 4G0B1lJ8Lbe

/* -*- 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/HTMLTextAreaElement.h"

#include "mozAutoDocUpdate.h"
#include "mozilla/AsyncEventDispatcher.h"
#include "mozilla/Attributes.h"
#include "mozilla/dom/HTMLFormSubmission.h"
#include "mozilla/dom/HTMLTextAreaElementBinding.h"
#include "mozilla/EventDispatcher.h"
#include "mozilla/EventStates.h"
#include "mozilla/GenericSpecifiedValuesInlines.h"
#include "mozilla/MouseEvents.h"
#include "nsAttrValueInlines.h"
#include "nsContentCID.h"
#include "nsContentCreatorFunctions.h"
#include "nsError.h"
#include "nsFocusManager.h"
#include "nsIComponentManager.h"
#include "nsIConstraintValidation.h"
#include "nsIControllers.h"
#include "nsIDocument.h"
#include "nsIDOMHTMLFormElement.h"
#include "nsIFormControlFrame.h"
#include "nsIFormControl.h"
#include "nsIForm.h"
#include "nsIFrame.h"
#include "nsISupportsPrimitives.h"
#include "nsITextControlFrame.h"
#include "nsLayoutUtils.h"
#include "nsLinebreakConverter.h"
#include "nsMappedAttributes.h"
#include "nsPIDOMWindow.h"
#include "nsPresContext.h"
#include "nsPresState.h"
#include "nsReadableUtils.h"
#include "nsStyleConsts.h"
#include "nsTextEditorState.h"
#include "nsIController.h"

static NS_DEFINE_CID(kXULControllersCID,  NS_XULCONTROLLERS_CID);

#define NS_NO_CONTENT_DISPATCH (1 << 0)

NS_IMPL_NS_NEW_HTML_ELEMENT_CHECK_PARSER(TextArea)

namespace mozilla {
namespace dom {

HTMLTextAreaElement::HTMLTextAreaElement(already_AddRefed<mozilla::dom::NodeInfo>& aNodeInfo,
                                         FromParser aFromParser)
  : nsGenericHTMLFormElementWithState(aNodeInfo, NS_FORM_TEXTAREA),
    mValueChanged(false),
    mLastValueChangeWasInteractive(false),
    mHandlingSelect(false),
    mDoneAddingChildren(!aFromParser),
    mInhibitStateRestoration(!!(aFromParser & FROM_PARSER_FRAGMENT)),
    mDisabledChanged(false),
    mCanShowInvalidUI(true),
    mCanShowValidUI(true),
    mIsPreviewEnabled(false),
    mState(this)
{
  AddMutationObserver(this);

  // Set up our default state.  By default we're enabled (since we're
  // a control type that can be disabled but not actually disabled
  // right now), optional, and valid.  We are NOT readwrite by default
  // until someone calls UpdateEditableState on us, apparently!  Also
  // by default we don't have to show validity UI and so forth.
  AddStatesSilently(NS_EVENT_STATE_ENABLED |
                    NS_EVENT_STATE_OPTIONAL |
                    NS_EVENT_STATE_VALID);
}


NS_IMPL_CYCLE_COLLECTION_INHERITED(HTMLTextAreaElement,
                                   nsGenericHTMLFormElementWithState,
                                   mValidity,
                                   mControllers,
                                   mState)

NS_IMPL_ADDREF_INHERITED(HTMLTextAreaElement, Element)
NS_IMPL_RELEASE_INHERITED(HTMLTextAreaElement, Element)


// QueryInterface implementation for HTMLTextAreaElement
NS_INTERFACE_TABLE_HEAD_CYCLE_COLLECTION_INHERITED(HTMLTextAreaElement)
  NS_INTERFACE_TABLE_INHERITED(HTMLTextAreaElement,
                               nsIDOMHTMLTextAreaElement,
                               nsITextControlElement,
                               nsIDOMNSEditableElement,
                               nsIMutationObserver,
                               nsIConstraintValidation)
NS_INTERFACE_TABLE_TAIL_INHERITING(nsGenericHTMLFormElementWithState)


// nsIDOMHTMLTextAreaElement

nsresult
HTMLTextAreaElement::Clone(mozilla::dom::NodeInfo *aNodeInfo, nsINode **aResult,
                           bool aPreallocateChildren) const
{
  *aResult = nullptr;
  already_AddRefed<mozilla::dom::NodeInfo> ni =
    RefPtr<mozilla::dom::NodeInfo>(aNodeInfo).forget();
  RefPtr<HTMLTextAreaElement> it = new HTMLTextAreaElement(ni);

  nsresult rv = const_cast<HTMLTextAreaElement*>(this)->CopyInnerTo(it, aPreallocateChildren);
  NS_ENSURE_SUCCESS(rv, rv);

  if (mValueChanged) {
    // Set our value on the clone.
    nsAutoString value;
    GetValueInternal(value, true);

    // SetValueInternal handles setting mValueChanged for us
    rv = it->SetValueInternal(value, nsTextEditorState::eSetValue_Notify);
    NS_ENSURE_SUCCESS(rv, rv);
  }

  it->mLastValueChangeWasInteractive = mLastValueChangeWasInteractive;
  it.forget(aResult);
  return NS_OK;
}

// nsIConstraintValidation
NS_IMPL_NSICONSTRAINTVALIDATION_EXCEPT_SETCUSTOMVALIDITY(HTMLTextAreaElement)


NS_IMETHODIMP
HTMLTextAreaElement::GetForm(nsIDOMHTMLFormElement** aForm)
{
  return nsGenericHTMLFormElementWithState::GetForm(aForm);
}


// nsIContent

NS_IMETHODIMP
HTMLTextAreaElement::Select()
{
  // XXX Bug?  We have to give the input focus before contents can be
  // selected

  FocusTristate state = FocusState();
  if (state == eUnfocusable) {
    return NS_OK;
  }

  nsIFocusManager* fm = nsFocusManager::GetFocusManager();

  RefPtr<nsPresContext> presContext = GetPresContext(eForComposedDoc);
  if (state == eInactiveWindow) {
    if (fm)
      fm->SetFocus(this, nsIFocusManager::FLAG_NOSCROLL);
    SelectAll(presContext);
    return NS_OK;
  }

  nsEventStatus status = nsEventStatus_eIgnore;
  WidgetGUIEvent event(true, eFormSelect, nullptr);
  // XXXbz HTMLInputElement guards against this reentering; shouldn't we?
  EventDispatcher::Dispatch(static_cast<nsIContent*>(this), presContext,
                            &event, nullptr, &status);

  // If the DOM event was not canceled (e.g. by a JS event handler
  // returning false)
  if (status == nsEventStatus_eIgnore) {
    if (fm) {
      fm->SetFocus(this, nsIFocusManager::FLAG_NOSCROLL);

      // ensure that the element is actually focused
      nsCOMPtr<nsIDOMElement> focusedElement;
      fm->GetFocusedElement(getter_AddRefs(focusedElement));
      if (SameCOMIdentity(static_cast<nsIDOMNode*>(this), focusedElement)) {
        // Now Select all the text!
        SelectAll(presContext);
      }
    }
  }

  return NS_OK;
}

NS_IMETHODIMP
HTMLTextAreaElement::SelectAll(nsPresContext* aPresContext)
{
  nsIFormControlFrame* formControlFrame = GetFormControlFrame(true);

  if (formControlFrame) {
    formControlFrame->SetFormProperty(nsGkAtoms::select, EmptyString());
  }

  return NS_OK;
}

bool
HTMLTextAreaElement::IsHTMLFocusable(bool aWithMouse,
                                     bool *aIsFocusable, int32_t *aTabIndex)
{
  if (nsGenericHTMLFormElementWithState::IsHTMLFocusable(aWithMouse, aIsFocusable,
                                                         aTabIndex))
  {
    return true;
  }

  // disabled textareas are not focusable
  *aIsFocusable = !IsDisabled();
  return false;
}

NS_IMPL_BOOL_ATTR(HTMLTextAreaElement, Autofocus, autofocus)
NS_IMPL_UINT_ATTR_NON_ZERO_DEFAULT_VALUE(HTMLTextAreaElement, Cols, cols, DEFAULT_COLS)
NS_IMPL_BOOL_ATTR(HTMLTextAreaElement, Disabled, disabled)
NS_IMPL_NON_NEGATIVE_INT_ATTR(HTMLTextAreaElement, MaxLength, maxlength)
NS_IMPL_NON_NEGATIVE_INT_ATTR(HTMLTextAreaElement, MinLength, minlength)
NS_IMPL_STRING_ATTR(HTMLTextAreaElement, Name, name)
NS_IMPL_BOOL_ATTR(HTMLTextAreaElement, ReadOnly, readonly)
NS_IMPL_BOOL_ATTR(HTMLTextAreaElement, Required, required)
NS_IMPL_UINT_ATTR_NON_ZERO_DEFAULT_VALUE(HTMLTextAreaElement, Rows, rows, DEFAULT_ROWS_TEXTAREA)
NS_IMPL_STRING_ATTR(HTMLTextAreaElement, Wrap, wrap)
NS_IMPL_STRING_ATTR(HTMLTextAreaElement, Placeholder, placeholder)
  
int32_t
HTMLTextAreaElement::TabIndexDefault()
{
  return 0;
}

NS_IMETHODIMP 
HTMLTextAreaElement::GetType(nsAString& aType)
{
  aType.AssignLiteral("textarea");

  return NS_OK;
}

NS_IMETHODIMP 
HTMLTextAreaElement::GetValue(nsAString& aValue)
{
  GetValueInternal(aValue, true);
  return NS_OK;
}

void
HTMLTextAreaElement::GetValueInternal(nsAString& aValue, bool aIgnoreWrap) const
{
  mState.GetValue(aValue, aIgnoreWrap);
}

NS_IMETHODIMP_(nsIEditor*)
HTMLTextAreaElement::GetTextEditor()
{
  return GetEditor();
}

NS_IMETHODIMP_(nsISelectionController*)
HTMLTextAreaElement::GetSelectionController()
{
  return mState.GetSelectionController();
}

NS_IMETHODIMP_(nsFrameSelection*)
HTMLTextAreaElement::GetConstFrameSelection()
{
  return mState.GetConstFrameSelection();
}

NS_IMETHODIMP
HTMLTextAreaElement::BindToFrame(nsTextControlFrame* aFrame)
{
  return mState.BindToFrame(aFrame);
}

NS_IMETHODIMP_(void)
HTMLTextAreaElement::UnbindFromFrame(nsTextControlFrame* aFrame)
{
  if (aFrame) {
    mState.UnbindFromFrame(aFrame);
  }
}

NS_IMETHODIMP
HTMLTextAreaElement::CreateEditor()
{
  return mState.PrepareEditor();
}

NS_IMETHODIMP_(Element*)
HTMLTextAreaElement::GetRootEditorNode()
{
  return mState.GetRootNode();
}

NS_IMETHODIMP_(Element*)
HTMLTextAreaElement::CreatePlaceholderNode()
{
  NS_ENSURE_SUCCESS(mState.CreatePlaceholderNode(), nullptr);
  return mState.GetPlaceholderNode();
}

NS_IMETHODIMP_(Element*)
HTMLTextAreaElement::GetPlaceholderNode()
{
  return mState.GetPlaceholderNode();
}

NS_IMETHODIMP_(void)
HTMLTextAreaElement::UpdateOverlayTextVisibility(bool aNotify)
{
  mState.UpdateOverlayTextVisibility(aNotify);
}

NS_IMETHODIMP_(bool)
HTMLTextAreaElement::GetPlaceholderVisibility()
{
  return mState.GetPlaceholderVisibility();
}

NS_IMETHODIMP_(Element*)
HTMLTextAreaElement::CreatePreviewNode()
{
  NS_ENSURE_SUCCESS(mState.CreatePreviewNode(), nullptr);
  return mState.GetPreviewNode();
}

NS_IMETHODIMP_(Element*)
HTMLTextAreaElement::GetPreviewNode()
{
  return mState.GetPreviewNode();
}

NS_IMETHODIMP_(void)
HTMLTextAreaElement::SetPreviewValue(const nsAString& aValue)
{
  mState.SetPreviewText(aValue, true);
}

NS_IMETHODIMP_(void)
HTMLTextAreaElement::GetPreviewValue(nsAString& aValue)
{
  mState.GetPreviewText(aValue);
}

NS_IMETHODIMP_(void)
HTMLTextAreaElement::EnablePreview()
{
  if (mIsPreviewEnabled) {
    return;
  }

  mIsPreviewEnabled = true;
  // Reconstruct the frame to append an anonymous preview node
  nsLayoutUtils::PostRestyleEvent(this, nsRestyleHint(0), nsChangeHint_ReconstructFrame);
}

NS_IMETHODIMP_(bool)
HTMLTextAreaElement::IsPreviewEnabled()
{
  return mIsPreviewEnabled;
}

NS_IMETHODIMP_(bool)
HTMLTextAreaElement::GetPreviewVisibility()
{
  return mState.GetPreviewVisibility();
}

nsresult
HTMLTextAreaElement::SetValueInternal(const nsAString& aValue,
                                      uint32_t aFlags)
{
  // Need to set the value changed flag here if our value has in fact changed
  // (i.e. if eSetValue_Notify is in aFlags), so that
  // nsTextControlFrame::UpdateValueDisplay retrieves the correct value if
  // needed.
  if (aFlags & nsTextEditorState::eSetValue_Notify) {
    SetValueChanged(true);
  }

  if (!mState.SetValue(aValue, aFlags)) {
    return NS_ERROR_OUT_OF_MEMORY;
  }

  return NS_OK;
}

NS_IMETHODIMP 
HTMLTextAreaElement::SetValue(const nsAString& aValue)
{
  // If the value has been set by a script, we basically want to keep the
  // current change event state. If the element is ready to fire a change
  // event, we should keep it that way. Otherwise, we should make sure the
  // element will not fire any event because of the script interaction.
  //
  // NOTE: this is currently quite expensive work (too much string
  // manipulation). We should probably optimize that.
  nsAutoString currentValue;
  GetValueInternal(currentValue, true);

  nsresult rv =
    SetValueInternal(aValue,
      nsTextEditorState::eSetValue_ByContent |
      nsTextEditorState::eSetValue_Notify |
      nsTextEditorState::eSetValue_MoveCursorToEndIfValueChanged);
  NS_ENSURE_SUCCESS(rv, rv);

  if (mFocusedValue.Equals(currentValue)) {
    GetValueInternal(mFocusedValue, true);
  }

  return NS_OK;
}

NS_IMETHODIMP 
HTMLTextAreaElement::SetUserInput(const nsAString& aValue)
{
  return SetValueInternal(aValue,
    nsTextEditorState::eSetValue_BySetUserInput |
    nsTextEditorState::eSetValue_Notify|
    nsTextEditorState::eSetValue_MoveCursorToEndIfValueChanged);
}

NS_IMETHODIMP
HTMLTextAreaElement::SetValueChanged(bool aValueChanged)
{
  bool previousValue = mValueChanged;

  mValueChanged = aValueChanged;
  if (!aValueChanged && !mState.IsEmpty()) {
    mState.EmptyValue();
  }

  if (mValueChanged != previousValue) {
    UpdateState(true);
  }

  return NS_OK;
}

NS_IMETHODIMP
HTMLTextAreaElement::GetDefaultValue(nsAString& aDefaultValue)
{
  if (!nsContentUtils::GetNodeTextContent(this, false, aDefaultValue, fallible)) {
    return NS_ERROR_OUT_OF_MEMORY;
  }
  return NS_OK;
}  

NS_IMETHODIMP
HTMLTextAreaElement::SetDefaultValue(const nsAString& aDefaultValue)
{
  ErrorResult error;
  SetDefaultValue(aDefaultValue, error);
  return error.StealNSResult();
}

void
HTMLTextAreaElement::SetDefaultValue(const nsAString& aDefaultValue, ErrorResult& aError)
{
  nsresult rv = nsContentUtils::SetNodeTextContent(this, aDefaultValue, true);
  if (NS_SUCCEEDED(rv) && !mValueChanged) {
    Reset();
  }
  if (NS_FAILED(rv)) {
    aError.Throw(rv);
  }
}

bool
HTMLTextAreaElement::ParseAttribute(int32_t aNamespaceID,
                                    nsIAtom* aAttribute,
                                    const nsAString& aValue,
                                    nsAttrValue& aResult)
{
  if (aNamespaceID == kNameSpaceID_None) {
    if (aAttribute == nsGkAtoms::maxlength ||
        aAttribute == nsGkAtoms::minlength) {
      return aResult.ParseNonNegativeIntValue(aValue);
    } else if (aAttribute == nsGkAtoms::cols) {
      aResult.ParseIntWithFallback(aValue, DEFAULT_COLS);
      return true;
    } else if (aAttribute == nsGkAtoms::rows) {
      aResult.ParseIntWithFallback(aValue, DEFAULT_ROWS_TEXTAREA);
      return true;
    }
  }
  return nsGenericHTMLElement::ParseAttribute(aNamespaceID, aAttribute, aValue,
                                              aResult);
}

void
HTMLTextAreaElement::MapAttributesIntoRule(const nsMappedAttributes* aAttributes,
                                           GenericSpecifiedValues* aData)
{
  if (aData->ShouldComputeStyleStruct(NS_STYLE_INHERIT_BIT(Text))) {
    // wrap=off
    if (!aData->PropertyIsSet(eCSSProperty_white_space)) {
      const nsAttrValue* value = aAttributes->GetAttr(nsGkAtoms::wrap);
      if (value && value->Type() == nsAttrValue::eString &&
          value->Equals(nsGkAtoms::OFF, eIgnoreCase)) {
        aData->SetKeywordValue(eCSSProperty_white_space, NS_STYLE_WHITESPACE_PRE);
      }
    }
  }

  nsGenericHTMLFormElementWithState::MapDivAlignAttributeInto(aAttributes, aData);
  nsGenericHTMLFormElementWithState::MapCommonAttributesInto(aAttributes, aData);
}

nsChangeHint
HTMLTextAreaElement::GetAttributeChangeHint(const nsIAtom* aAttribute,
                                            int32_t aModType) const
{
  nsChangeHint retval =
      nsGenericHTMLFormElementWithState::GetAttributeChangeHint(aAttribute, aModType);
  if (aAttribute == nsGkAtoms::rows ||
      aAttribute == nsGkAtoms::cols) {
    retval |= NS_STYLE_HINT_REFLOW;
  } else if (aAttribute == nsGkAtoms::wrap) {
    retval |= nsChangeHint_ReconstructFrame;
  } else if (aAttribute == nsGkAtoms::placeholder) {
    retval |= nsChangeHint_ReconstructFrame;
  }
  return retval;
}

NS_IMETHODIMP_(bool)
HTMLTextAreaElement::IsAttributeMapped(const nsIAtom* aAttribute) const
{
  static const MappedAttributeEntry attributes[] = {
    { &nsGkAtoms::wrap },
    { nullptr }
  };

  static const MappedAttributeEntry* const map[] = {
    attributes,
    sDivAlignAttributeMap,
    sCommonAttributeMap,
  };

  return FindAttributeDependence(aAttribute, map);
}

nsMapRuleToAttributesFunc
HTMLTextAreaElement::GetAttributeMappingFunction() const
{
  return &MapAttributesIntoRule;
}

bool
HTMLTextAreaElement::IsDisabledForEvents(EventMessage aMessage)
{
  nsIFormControlFrame* formControlFrame = GetFormControlFrame(false);
  nsIFrame* formFrame = do_QueryFrame(formControlFrame);
  return IsElementDisabledForEvents(aMessage, formFrame);
}

nsresult
HTMLTextAreaElement::GetEventTargetParent(EventChainPreVisitor& aVisitor)
{
  aVisitor.mCanHandle = false;
  if (IsDisabledForEvents(aVisitor.mEvent->mMessage)) {
    return NS_OK;
  }

  // Don't dispatch a second select event if we are already handling
  // one.
  if (aVisitor.mEvent->mMessage == eFormSelect) {
    if (mHandlingSelect) {
      return NS_OK;
    }
    mHandlingSelect = true;
  }

  // If noContentDispatch is true we will not allow content to handle
  // this event.  But to allow middle mouse button paste to work we must allow 
  // middle clicks to go to text fields anyway.
  if (aVisitor.mEvent->mFlags.mNoContentDispatch) {
    aVisitor.mItemFlags |= NS_NO_CONTENT_DISPATCH;
  }
  if (aVisitor.mEvent->mMessage == eMouseClick &&
      aVisitor.mEvent->AsMouseEvent()->button ==
        WidgetMouseEvent::eMiddleButton) {
    aVisitor.mEvent->mFlags.mNoContentDispatch = false;
  }

  if (aVisitor.mEvent->mMessage == eBlur) {
    // Set mWantsPreHandleEvent and fire change event in PreHandleEvent to
    // prevent it breaks event target chain creation.
    aVisitor.mWantsPreHandleEvent = true;
  }

  return nsGenericHTMLFormElementWithState::GetEventTargetParent(aVisitor);
}

nsresult
HTMLTextAreaElement::PreHandleEvent(EventChainVisitor& aVisitor)
{
  if (aVisitor.mEvent->mMessage == eBlur) {
    // Fire onchange (if necessary), before we do the blur, bug 370521.
    FireChangeEventIfNeeded();
  }
  return nsGenericHTMLFormElementWithState::PreHandleEvent(aVisitor);
}

void
HTMLTextAreaElement::FireChangeEventIfNeeded()
{
  nsString value;
  GetValueInternal(value, true);

  if (mFocusedValue.Equals(value)) {
    return;
  }

  // Dispatch the change event.
  mFocusedValue = value;
  nsContentUtils::DispatchTrustedEvent(OwnerDoc(),
                                       static_cast<nsIContent*>(this),
                                       NS_LITERAL_STRING("change"), true,
                                       false);
}

nsresult
HTMLTextAreaElement::PostHandleEvent(EventChainPostVisitor& aVisitor)
{
  if (aVisitor.mEvent->mMessage == eFormSelect) {
    mHandlingSelect = false;
  }

  if (aVisitor.mEvent->mMessage == eFocus ||
      aVisitor.mEvent->mMessage == eBlur) {
    if (aVisitor.mEvent->mMessage == eFocus) {
      // If the invalid UI is shown, we should show it while focusing (and
      // update). Otherwise, we should not.
      GetValueInternal(mFocusedValue, true);
      mCanShowInvalidUI = !IsValid() && ShouldShowValidityUI();

      // If neither invalid UI nor valid UI is shown, we shouldn't show the valid
      // UI while typing.
      mCanShowValidUI = ShouldShowValidityUI();
    } else { // eBlur
      mCanShowInvalidUI = true;
      mCanShowValidUI = true;
    }

    UpdateState(true);
  }

  // Reset the flag for other content besides this text field
  aVisitor.mEvent->mFlags.mNoContentDispatch =
    ((aVisitor.mItemFlags & NS_NO_CONTENT_DISPATCH) != 0);

  return NS_OK;
}

void
HTMLTextAreaElement::DoneAddingChildren(bool aHaveNotified)
{
  if (!mValueChanged) {
    if (!mDoneAddingChildren) {
      // Reset now that we're done adding children if the content sink tried to
      // sneak some text in without calling AppendChildTo.
      Reset();
    }

    if (!mInhibitStateRestoration) {
      nsresult rv = GenerateStateKey();
      if (NS_SUCCEEDED(rv)) {
        RestoreFormControlState();
      }
    }
  }

  mDoneAddingChildren = true;
}

bool
HTMLTextAreaElement::IsDoneAddingChildren()
{
  return mDoneAddingChildren;
}

// Controllers Methods

nsIControllers*
HTMLTextAreaElement::GetControllers(ErrorResult& aError)
{
  if (!mControllers)
  {
    nsresult rv;
    mControllers = do_CreateInstance(kXULControllersCID, &rv);
    if (NS_FAILED(rv)) {
      aError.Throw(rv);
      return nullptr;
    }

    nsCOMPtr<nsIController> controller = do_CreateInstance("@mozilla.org/editor/editorcontroller;1", &rv);
    if (NS_FAILED(rv)) {
      aError.Throw(rv);
      return nullptr;
    }

    mControllers->AppendController(controller);

    controller = do_CreateInstance("@mozilla.org/editor/editingcontroller;1", &rv);
    if (NS_FAILED(rv)) {
      aError.Throw(rv);
      return nullptr;
    }

    mControllers->AppendController(controller);
  }

  return mControllers;
}

NS_IMETHODIMP
HTMLTextAreaElement::GetControllers(nsIControllers** aResult)
{
  NS_ENSURE_ARG_POINTER(aResult);

  ErrorResult error;
  *aResult = GetControllers(error);
  NS_IF_ADDREF(*aResult);

  return error.StealNSResult();
}

uint32_t
HTMLTextAreaElement::GetTextLength()
{
  nsAutoString val;
  GetValue(val);
  return val.Length();
}

NS_IMETHODIMP
HTMLTextAreaElement::GetTextLength(int32_t *aTextLength)
{
  NS_ENSURE_ARG_POINTER(aTextLength);
  *aTextLength = GetTextLength();

  return NS_OK;
}

Nullable<uint32_t>
HTMLTextAreaElement::GetSelectionStart(ErrorResult& aError)
{
  uint32_t selStart, selEnd;
  GetSelectionRange(&selStart, &selEnd, aError);
  return Nullable<uint32_t>(selStart);
}

void
HTMLTextAreaElement::SetSelectionStart(const Nullable<uint32_t>& aSelectionStart,
                                       ErrorResult& aError)
{
  mState.SetSelectionStart(aSelectionStart, aError);
}

Nullable<uint32_t>
HTMLTextAreaElement::GetSelectionEnd(ErrorResult& aError)
{
  uint32_t selStart, selEnd;
  GetSelectionRange(&selStart, &selEnd, aError);
  return Nullable<uint32_t>(selEnd);
}

void
HTMLTextAreaElement::SetSelectionEnd(const Nullable<uint32_t>& aSelectionEnd,
                                     ErrorResult& aError)
{
  mState.SetSelectionEnd(aSelectionEnd, aError);
}

void
HTMLTextAreaElement::GetSelectionRange(uint32_t* aSelectionStart,
                                       uint32_t* aSelectionEnd,
                                       ErrorResult& aRv)
{
  return mState.GetSelectionRange(aSelectionStart, aSelectionEnd, aRv);
}

void
HTMLTextAreaElement::GetSelectionDirection(nsAString& aDirection, ErrorResult& aError)
{
  mState.GetSelectionDirectionString(aDirection, aError);
}

void
HTMLTextAreaElement::SetSelectionDirection(const nsAString& aDirection,
                                           ErrorResult& aError)
{
  mState.SetSelectionDirection(aDirection, aError);
}

void
HTMLTextAreaElement::SetSelectionRange(uint32_t aSelectionStart,
                                       uint32_t aSelectionEnd,
                                       const Optional<nsAString>& aDirection,
                                       ErrorResult& aError)
{
  mState.SetSelectionRange(aSelectionStart, aSelectionEnd,
                           aDirection, aError);
}

void
HTMLTextAreaElement::SetRangeText(const nsAString& aReplacement,
                                  ErrorResult& aRv)
{
  mState.SetRangeText(aReplacement, aRv);
}

void
HTMLTextAreaElement::SetRangeText(const nsAString& aReplacement,
                                  uint32_t aStart, uint32_t aEnd,
                                  SelectionMode aSelectMode,
                                  ErrorResult& aRv)
{
  mState.SetRangeText(aReplacement, aStart, aEnd, aSelectMode, aRv);
}

void
HTMLTextAreaElement::GetValueFromSetRangeText(nsAString& aValue)
{
  GetValueInternal(aValue, false);
}

nsresult
HTMLTextAreaElement::SetValueFromSetRangeText(const nsAString& aValue)
{
  return SetValueInternal(aValue,
                          nsTextEditorState::eSetValue_ByContent |
                          nsTextEditorState::eSetValue_Notify);
}

nsresult
HTMLTextAreaElement::Reset()
{
  nsAutoString resetVal;
  GetDefaultValue(resetVal);
  SetValueChanged(false);

  nsresult rv = SetValueInternal(resetVal,
                                 nsTextEditorState::eSetValue_Internal);
  NS_ENSURE_SUCCESS(rv, rv);

  return NS_OK;
}

NS_IMETHODIMP
HTMLTextAreaElement::SubmitNamesValues(HTMLFormSubmission* aFormSubmission)
{
  // Disabled elements don't submit
  if (IsDisabled()) {
    return NS_OK;
  }

  //
  // Get the name (if no name, no submit)
  //
  nsAutoString name;
  GetAttr(kNameSpaceID_None, nsGkAtoms::name, name);
  if (name.IsEmpty()) {
    return NS_OK;
  }

  //
  // Get the value
  //
  nsAutoString value;
  GetValueInternal(value, false);

  //
  // Submit
  //
  return aFormSubmission->AddNameValuePair(name, value);
}

NS_IMETHODIMP
HTMLTextAreaElement::SaveState()
{
  nsresult rv = NS_OK;

  // Only save if value != defaultValue (bug 62713)
  nsPresState *state = nullptr;
  if (mValueChanged) {
    state = GetPrimaryPresState();
    if (state) {
      nsAutoString value;
      GetValueInternal(value, true);

      rv = nsLinebreakConverter::ConvertStringLineBreaks(
               value,
               nsLinebreakConverter::eLinebreakPlatform,
               nsLinebreakConverter::eLinebreakContent);

      if (NS_FAILED(rv)) {
        NS_ERROR("Converting linebreaks failed!");
        return rv;
      }

      nsCOMPtr<nsISupportsString> pState =
        do_CreateInstance(NS_SUPPORTS_STRING_CONTRACTID);
      if (!pState) {
        return NS_ERROR_OUT_OF_MEMORY;
      }
      pState->SetData(value);
      state->SetStateProperty(pState);
    }
  }

  if (mDisabledChanged) {
    if (!state) {
      state = GetPrimaryPresState();
      rv = NS_OK;
    }
    if (state) {
      // We do not want to save the real disabled state but the disabled
      // attribute.
      state->SetDisabled(HasAttr(kNameSpaceID_None, nsGkAtoms::disabled));
    }
  }
  return rv;
}

bool
HTMLTextAreaElement::RestoreState(nsPresState* aState)
{
  nsCOMPtr<nsISupportsString> state
    (do_QueryInterface(aState->GetStateProperty()));
  
  if (state) {
    nsAutoString data;
    state->GetData(data);
    nsresult rv = SetValue(data);
    NS_ENSURE_SUCCESS(rv, false);
  }

  if (aState->IsDisabledSet() && !aState->GetDisabled()) {
    SetDisabled(false);
  }

  return false;
}

EventStates
HTMLTextAreaElement::IntrinsicState() const
{
  EventStates state = nsGenericHTMLFormElementWithState::IntrinsicState();

  if (HasAttr(kNameSpaceID_None, nsGkAtoms::required)) {
    state |= NS_EVENT_STATE_REQUIRED;
  } else {
    state |= NS_EVENT_STATE_OPTIONAL;
  }

  if (IsCandidateForConstraintValidation()) {
    if (IsValid()) {
      state |= NS_EVENT_STATE_VALID;
    } else {
      state |= NS_EVENT_STATE_INVALID;
      // :-moz-ui-invalid always apply if the element suffers from a custom
      // error and never applies if novalidate is set on the form owner.
      if ((!mForm || !mForm->HasAttr(kNameSpaceID_None, nsGkAtoms::novalidate)) &&
          (GetValidityState(VALIDITY_STATE_CUSTOM_ERROR) ||
           (mCanShowInvalidUI && ShouldShowValidityUI()))) {
        state |= NS_EVENT_STATE_MOZ_UI_INVALID;
      }
    }

    // :-moz-ui-valid applies if all the following are true:
    // 1. The element is not focused, or had either :-moz-ui-valid or
    //    :-moz-ui-invalid applying before it was focused ;
    // 2. The element is either valid or isn't allowed to have
    //    :-moz-ui-invalid applying ;
    // 3. The element has no form owner or its form owner doesn't have the
    //    novalidate attribute set ;
    // 4. The element has already been modified or the user tried to submit the
    //    form owner while invalid.
    if ((!mForm || !mForm->HasAttr(kNameSpaceID_None, nsGkAtoms::novalidate)) &&
        (mCanShowValidUI && ShouldShowValidityUI() &&
         (IsValid() || (state.HasState(NS_EVENT_STATE_MOZ_UI_INVALID) &&
                        !mCanShowInvalidUI)))) {
      state |= NS_EVENT_STATE_MOZ_UI_VALID;
    }
  }

  if (HasAttr(kNameSpaceID_None, nsGkAtoms::placeholder) &&
      IsValueEmpty()) {
    state |= NS_EVENT_STATE_PLACEHOLDERSHOWN;
  }

  return state;
}

nsresult
HTMLTextAreaElement::BindToTree(nsIDocument* aDocument, nsIContent* aParent,
                                nsIContent* aBindingParent,
                                bool aCompileEventHandlers)
{
  nsresult rv = nsGenericHTMLFormElementWithState::BindToTree(aDocument, aParent,
                                                              aBindingParent,
                                                              aCompileEventHandlers);
  NS_ENSURE_SUCCESS(rv, rv);

  // If there is a disabled fieldset in the parent chain, the element is now
  // barred from constraint validation and can't suffer from value missing.
  UpdateValueMissingValidityState();
  UpdateBarredFromConstraintValidation();

  // And now make sure our state is up to date
  UpdateState(false);

  return rv;
}

void
HTMLTextAreaElement::UnbindFromTree(bool aDeep, bool aNullParent)
{
  nsGenericHTMLFormElementWithState::UnbindFromTree(aDeep, aNullParent);

  // We might be no longer disabled because of parent chain changed.
  UpdateValueMissingValidityState();
  UpdateBarredFromConstraintValidation();

  // And now make sure our state is up to date
  UpdateState(false);
}

nsresult
HTMLTextAreaElement::BeforeSetAttr(int32_t aNameSpaceID, nsIAtom* aName,
                                   const nsAttrValueOrString* aValue,
                                   bool aNotify)
{
  if (aNotify && aName == nsGkAtoms::disabled &&
      aNameSpaceID == kNameSpaceID_None) {
    mDisabledChanged = true;
  }

  return nsGenericHTMLFormElementWithState::BeforeSetAttr(aNameSpaceID, aName,
                                                 aValue, aNotify);
}

void
HTMLTextAreaElement::CharacterDataChanged(nsIDocument* aDocument,
                                          nsIContent* aContent,
                                          CharacterDataChangeInfo* aInfo)
{
  ContentChanged(aContent);
}

void
HTMLTextAreaElement::ContentAppended(nsIDocument* aDocument,
                                     nsIContent* aContainer,
                                     nsIContent* aFirstNewContent,
                                     int32_t /* unused */)
{
  ContentChanged(aFirstNewContent);
}

void
HTMLTextAreaElement::ContentInserted(nsIDocument* aDocument,
                                     nsIContent* aContainer,
                                     nsIContent* aChild,
                                     int32_t /* unused */)
{
  ContentChanged(aChild);
}

void
HTMLTextAreaElement::ContentRemoved(nsIDocument* aDocument,
                                    nsIContent* aContainer,
                                    nsIContent* aChild,
                                    int32_t aIndexInContainer,
                                    nsIContent* aPreviousSibling)
{
  ContentChanged(aChild);
}

void
HTMLTextAreaElement::ContentChanged(nsIContent* aContent)
{
  if (!mValueChanged && mDoneAddingChildren &&
      nsContentUtils::IsInSameAnonymousTree(this, aContent)) {
    // Hard to say what the reset can trigger, so be safe pending
    // further auditing.
    nsCOMPtr<nsIMutationObserver> kungFuDeathGrip(this);
    Reset();
  }
}

nsresult
HTMLTextAreaElement::AfterSetAttr(int32_t aNameSpaceID, nsIAtom* aName,
                                  const nsAttrValue* aValue,
                                  const nsAttrValue* aOldValue, bool aNotify)
{
  if (aNameSpaceID == kNameSpaceID_None) {
    if (aName == nsGkAtoms::required || aName == nsGkAtoms::disabled ||
        aName == nsGkAtoms::readonly) {
      UpdateValueMissingValidityState();

      // This *has* to be called *after* validity has changed.
      if (aName == nsGkAtoms::readonly || aName == nsGkAtoms::disabled) {
        UpdateBarredFromConstraintValidation();
      }
    } else if (aName == nsGkAtoms::maxlength) {
      UpdateTooLongValidityState();
    } else if (aName == nsGkAtoms::minlength) {
      UpdateTooShortValidityState();
    }
  }

  return nsGenericHTMLFormElementWithState::AfterSetAttr(aNameSpaceID, aName, aValue,
                                                         aOldValue, aNotify);
  }

nsresult
HTMLTextAreaElement::CopyInnerTo(Element* aDest, bool aPreallocateChildren)
{
  nsresult rv = nsGenericHTMLFormElementWithState::CopyInnerTo(aDest,
                                                               aPreallocateChildren);
  NS_ENSURE_SUCCESS(rv, rv);

  if (aDest->OwnerDoc()->IsStaticDocument()) {
    nsAutoString value;
    GetValueInternal(value, true);
    return static_cast<HTMLTextAreaElement*>(aDest)->SetValue(value);
  }
  return NS_OK;
}

bool
HTMLTextAreaElement::IsMutable() const
{
  return (!HasAttr(kNameSpaceID_None, nsGkAtoms::readonly) && !IsDisabled());
}

bool
HTMLTextAreaElement::IsValueEmpty() const
{
  nsAutoString value;
  GetValueInternal(value, true);

  return value.IsEmpty();
}

// nsIConstraintValidation

NS_IMETHODIMP
HTMLTextAreaElement::SetCustomValidity(const nsAString& aError)
{
  nsIConstraintValidation::SetCustomValidity(aError);

  UpdateState(true);

  return NS_OK;
}

bool
HTMLTextAreaElement::IsTooLong()
{
  if (!mValueChanged ||
      !mLastValueChangeWasInteractive ||
      !HasAttr(kNameSpaceID_None, nsGkAtoms::maxlength)) {
    return false;
  }

  int32_t maxLength = -1;
  GetMaxLength(&maxLength);

  // Maxlength of -1 means parsing error.
  if (maxLength == -1) {
    return false;
  }

  int32_t textLength = -1;
  GetTextLength(&textLength);

  return textLength > maxLength;
}

bool
HTMLTextAreaElement::IsTooShort()
{
  if (!mValueChanged ||
      !mLastValueChangeWasInteractive ||
      !HasAttr(kNameSpaceID_None, nsGkAtoms::minlength)) {
    return false;
  }

  int32_t minLength = -1;
  GetMinLength(&minLength);

  // Minlength of -1 means parsing error.
  if (minLength == -1) {
    return false;
  }

  int32_t textLength = -1;
  GetTextLength(&textLength);

  return textLength && textLength < minLength;
}

bool
HTMLTextAreaElement::IsValueMissing() const
{
  if (!HasAttr(kNameSpaceID_None, nsGkAtoms::required) || !IsMutable()) {
    return false;
  }

  return IsValueEmpty();
}

void
HTMLTextAreaElement::UpdateTooLongValidityState()
{
  SetValidityState(VALIDITY_STATE_TOO_LONG, IsTooLong());
}

void
HTMLTextAreaElement::UpdateTooShortValidityState()
{
  SetValidityState(VALIDITY_STATE_TOO_SHORT, IsTooShort());
}

void
HTMLTextAreaElement::UpdateValueMissingValidityState()
{
  SetValidityState(VALIDITY_STATE_VALUE_MISSING, IsValueMissing());
}

void
HTMLTextAreaElement::UpdateBarredFromConstraintValidation()
{
  SetBarredFromConstraintValidation(HasAttr(kNameSpaceID_None,
                                            nsGkAtoms::readonly) ||
                                    IsDisabled());
}

nsresult
HTMLTextAreaElement::GetValidationMessage(nsAString& aValidationMessage,
                                          ValidityStateType aType)
{
  nsresult rv = NS_OK;

  switch (aType)
  {
    case VALIDITY_STATE_TOO_LONG:
      {
        nsXPIDLString message;
        int32_t maxLength = -1;
        int32_t textLength = -1;
        nsAutoString strMaxLength;
        nsAutoString strTextLength;

        GetMaxLength(&maxLength);
        GetTextLength(&textLength);

        strMaxLength.AppendInt(maxLength);
        strTextLength.AppendInt(textLength);

        const char16_t* params[] = { strMaxLength.get(), strTextLength.get() };
        rv = nsContentUtils::FormatLocalizedString(nsContentUtils::eDOM_PROPERTIES,
                                                   "FormValidationTextTooLong",
                                                   params, message);
        aValidationMessage = message;
      }
      break;
    case VALIDITY_STATE_TOO_SHORT:
      {
        nsXPIDLString message;
        int32_t minLength = -1;
        int32_t textLength = -1;
        nsAutoString strMinLength;
        nsAutoString strTextLength;

        GetMinLength(&minLength);
        GetTextLength(&textLength);

        strMinLength.AppendInt(minLength);
        strTextLength.AppendInt(textLength);

        const char16_t* params[] = { strMinLength.get(), strTextLength.get() };
        rv = nsContentUtils::FormatLocalizedString(nsContentUtils::eDOM_PROPERTIES,
                                                   "FormValidationTextTooShort",
                                                   params, message);
        aValidationMessage = message;
      }
      break;
    case VALIDITY_STATE_VALUE_MISSING:
      {
        nsXPIDLString message;
        rv = nsContentUtils::GetLocalizedString(nsContentUtils::eDOM_PROPERTIES,
                                                "FormValidationValueMissing",
                                                message);
        aValidationMessage = message;
      }
      break;
    default:
      rv = nsIConstraintValidation::GetValidationMessage(aValidationMessage, aType);
  }

  return rv;
}

NS_IMETHODIMP_(bool)
HTMLTextAreaElement::IsSingleLineTextControl() const
{
  return false;
}

NS_IMETHODIMP_(bool)
HTMLTextAreaElement::IsTextArea() const
{
  return true;
}

NS_IMETHODIMP_(bool)
HTMLTextAreaElement::IsPlainTextControl() const
{
  // need to check our HTML attribute and/or CSS.
  return true;
}

NS_IMETHODIMP_(bool)
HTMLTextAreaElement::IsPasswordTextControl() const
{
  return false;
}

NS_IMETHODIMP_(int32_t)
HTMLTextAreaElement::GetCols()
{
  return Cols();
}

NS_IMETHODIMP_(int32_t)
HTMLTextAreaElement::GetWrapCols()
{
  // wrap=off means -1 for wrap width no matter what cols is
  nsHTMLTextWrap wrapProp;
  nsITextControlElement::GetWrapPropertyEnum(this, wrapProp);
  if (wrapProp == nsITextControlElement::eHTMLTextWrap_Off) {
    // do not wrap when wrap=off
    return 0;
  }

  // Otherwise we just wrap at the given number of columns
  return GetCols();
}


NS_IMETHODIMP_(int32_t)
HTMLTextAreaElement::GetRows()
{
  const nsAttrValue* attr = GetParsedAttr(nsGkAtoms::rows);
  if (attr && attr->Type() == nsAttrValue::eInteger) {
    int32_t rows = attr->GetIntegerValue();
    return (rows <= 0) ? DEFAULT_ROWS_TEXTAREA : rows;
  }

  return DEFAULT_ROWS_TEXTAREA;
}

NS_IMETHODIMP_(void)
HTMLTextAreaElement::GetDefaultValueFromContent(nsAString& aValue)
{
  GetDefaultValue(aValue);
}

NS_IMETHODIMP_(bool)
HTMLTextAreaElement::ValueChanged() const
{
  return mValueChanged;
}

NS_IMETHODIMP_(void)
HTMLTextAreaElement::GetTextEditorValue(nsAString& aValue,
                                        bool aIgnoreWrap) const
{
  mState.GetValue(aValue, aIgnoreWrap);
}

NS_IMETHODIMP_(void)
HTMLTextAreaElement::InitializeKeyboardEventListeners()
{
  mState.InitializeKeyboardEventListeners();
}

NS_IMETHODIMP_(void)
HTMLTextAreaElement::OnValueChanged(bool aNotify, bool aWasInteractiveUserChange)
{
  mLastValueChangeWasInteractive = aWasInteractiveUserChange;

  // Update the validity state
  bool validBefore = IsValid();
  UpdateTooLongValidityState();
  UpdateTooShortValidityState();
  UpdateValueMissingValidityState();

  if (validBefore != IsValid() ||
      HasAttr(kNameSpaceID_None, nsGkAtoms::placeholder)) {
    UpdateState(aNotify);
  }
}

NS_IMETHODIMP_(bool)
HTMLTextAreaElement::HasCachedSelection()
{
  return mState.IsSelectionCached();
}

void
HTMLTextAreaElement::FieldSetDisabledChanged(bool aNotify)
{
  UpdateValueMissingValidityState();
  UpdateBarredFromConstraintValidation();

  nsGenericHTMLFormElementWithState::FieldSetDisabledChanged(aNotify);
}

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

} // namespace dom
} // namespace mozilla