/*
 * Copyright (C) 2010 Google Inc. All rights reserved.
 * Copyright (C) 2011-2018 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
 *     * Neither the name of Google Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "config.h"
#include "TextFieldInputType.h"

#include "BeforeTextInsertedEvent.h"
#include "Chrome.h"
#include "ChromeClient.h"
#include "DOMFormData.h"
#include "Editor.h"
#include "EventNames.h"
#include "Frame.h"
#include "FrameSelection.h"
#include "HTMLInputElement.h"
#include "HTMLNames.h"
#include "HTMLParserIdioms.h"
#include "KeyboardEvent.h"
#include "LocalizedStrings.h"
#include "NodeRenderStyle.h"
#include "Page.h"
#include "PlatformKeyboardEvent.h"
#include "RenderLayer.h"
#include "RenderTextControlSingleLine.h"
#include "RenderTheme.h"
#include "RuntimeEnabledFeatures.h"
#include "ScriptDisallowedScope.h"
#include "ShadowRoot.h"
#include "TextControlInnerElements.h"
#include "TextEvent.h"
#include "TextIterator.h"
#include "TextNodeTraversal.h"
#include "UserTypingGestureIndicator.h"
#include "WheelEvent.h"

#if ENABLE(DATALIST_ELEMENT)
#include "HTMLDataListElement.h"
#include "HTMLOptionElement.h"
#endif

namespace WebCore {

using namespace HTMLNames;

TextFieldInputType::TextFieldInputType(HTMLInputElement& element)
    : InputType(element)
{
}

TextFieldInputType::~TextFieldInputType()
{
    if (m_innerSpinButton)
        m_innerSpinButton->removeSpinButtonOwner();
#if ENABLE(DATALIST_ELEMENT)
    closeSuggestions();
#endif
}

bool TextFieldInputType::isKeyboardFocusable(KeyboardEvent*) const
{
    ASSERT(element());
#if PLATFORM(IOS_FAMILY)
    if (element()->isReadOnly())
        return false;
#endif
    return element()->isTextFormControlFocusable();
}

bool TextFieldInputType::isMouseFocusable() const
{
    ASSERT(element());
    return element()->isTextFormControlFocusable();
}

bool TextFieldInputType::isTextField() const
{
    return true;
}

bool TextFieldInputType::isEmptyValue() const
{
    auto innerText = innerTextElement();
    ASSERT(innerText);

    for (Text* text = TextNodeTraversal::firstWithin(*innerText); text; text = TextNodeTraversal::next(*text, innerText.get())) {
        if (text->length())
            return false;
    }
    return true;
}

bool TextFieldInputType::valueMissing(const String& value) const
{
    ASSERT(element());
    return element()->isRequired() && value.isEmpty();
}

void TextFieldInputType::setValue(const String& sanitizedValue, bool valueChanged, TextFieldEventBehavior eventBehavior)
{
    ASSERT(element());

    // Grab this input element to keep reference even if JS event handler
    // changes input type.
    Ref<HTMLInputElement> input(*element());

    // We don't ask InputType::setValue to dispatch events because
    // TextFieldInputType dispatches events different way from InputType.
    InputType::setValue(sanitizedValue, valueChanged, DispatchNoEvent);

    if (valueChanged)
        updateInnerTextValue();

    unsigned max = visibleValue().length();
    if (input->focused())
        input->setSelectionRange(max, max);
    else
        input->cacheSelectionInResponseToSetValue(max);

    if (!valueChanged)
        return;

    switch (eventBehavior) {
    case DispatchChangeEvent:
        // If the user is still editing this field, dispatch an input event rather than a change event.
        // The change event will be dispatched when editing finishes.
        if (input->focused())
            input->dispatchFormControlInputEvent();
        else
            input->dispatchFormControlChangeEvent();
        break;

    case DispatchInputAndChangeEvent: {
        input->dispatchFormControlInputEvent();
        input->dispatchFormControlChangeEvent();
        break;
    }

    case DispatchNoEvent:
        break;
    }

    // FIXME: Why do we do this when eventBehavior == DispatchNoEvent
    if (!input->focused() || eventBehavior == DispatchNoEvent)
        input->setTextAsOfLastFormControlChangeEvent(sanitizedValue);

    if (UserTypingGestureIndicator::processingUserTypingGesture())
        didSetValueByUserEdit();
}

#if ENABLE(DATALIST_ELEMENT)
void TextFieldInputType::handleClickEvent(MouseEvent&)
{
    if (element()->focused() && element()->list())
        displaySuggestions(DataListSuggestionActivationType::ControlClicked);
}
#endif

auto TextFieldInputType::handleKeydownEvent(KeyboardEvent& event) -> ShouldCallBaseEventHandler
{
    ASSERT(element());
    if (!element()->focused())
        return ShouldCallBaseEventHandler::Yes;
#if ENABLE(DATALIST_ELEMENT)
    const String& key = event.keyIdentifier();
    if (m_suggestionPicker && (key == "Enter" || key == "Up" || key == "Down")) {
        m_suggestionPicker->handleKeydownWithIdentifier(key);
        event.setDefaultHandled();
    }
#endif
    RefPtr<Frame> frame = element()->document().frame();
    if (frame && frame->editor().doTextFieldCommandFromEvent(element(), &event))
        event.setDefaultHandled();
    return ShouldCallBaseEventHandler::Yes;
}

void TextFieldInputType::handleKeydownEventForSpinButton(KeyboardEvent& event)
{
    ASSERT(element());
    if (element()->isDisabledOrReadOnly())
        return;
#if ENABLE(DATALIST_ELEMENT)
    if (m_suggestionPicker)
        return;
#endif
    const String& key = event.keyIdentifier();
    if (key == "Up")
        spinButtonStepUp();
    else if (key == "Down")
        spinButtonStepDown();
    else
        return;
    event.setDefaultHandled();
}

void TextFieldInputType::forwardEvent(Event& event)
{
    if (m_innerSpinButton) {
        m_innerSpinButton->forwardEvent(event);
        if (event.defaultHandled())
            return;
    }

    bool isFocusEvent = event.type() == eventNames().focusEvent;
    bool isBlurEvent = event.type() == eventNames().blurEvent;
    if (isFocusEvent || isBlurEvent)
        capsLockStateMayHaveChanged();
    if (event.isMouseEvent() || isFocusEvent || isBlurEvent) {
        ASSERT(element());
        element()->forwardEvent(event);
    }
}

void TextFieldInputType::elementDidBlur()
{
    ASSERT(element());
    auto* renderer = element()->renderer();
    if (!renderer)
        return;

    auto* innerTextRenderer = innerTextElement()->renderer();
    if (!innerTextRenderer)
        return;

    auto* innerLayer = innerTextRenderer->layer();
    if (!innerLayer)
        return;

    bool isLeftToRightDirection = downcast<RenderTextControlSingleLine>(*renderer).style().isLeftToRightDirection();
    ScrollOffset scrollOffset(isLeftToRightDirection ? 0 : innerLayer->scrollWidth(), 0);
    innerLayer->scrollToOffset(scrollOffset);

#if ENABLE(DATALIST_ELEMENT)
    closeSuggestions();
#endif
}

void TextFieldInputType::handleFocusEvent(Node* oldFocusedNode, FocusDirection)
{
    ASSERT(element());
    ASSERT_UNUSED(oldFocusedNode, oldFocusedNode != element());
    if (RefPtr<Frame> frame = element()->document().frame()) {
        frame->editor().textFieldDidBeginEditing(element());
#if ENABLE(DATALIST_ELEMENT) && PLATFORM(IOS_FAMILY)
        if (element()->list() && m_dataListDropdownIndicator)
            m_dataListDropdownIndicator->setInlineStyleProperty(CSSPropertyDisplay, suggestions().size() ? CSSValueBlock : CSSValueNone, true);
#endif
    }
}

void TextFieldInputType::handleBlurEvent()
{
    InputType::handleBlurEvent();
    ASSERT(element());
    element()->endEditing();
#if ENABLE(DATALIST_ELEMENT) && PLATFORM(IOS_FAMILY)
    if (element()->list() && m_dataListDropdownIndicator)
        m_dataListDropdownIndicator->setInlineStyleProperty(CSSPropertyDisplay, CSSValueNone, true);
#endif
}

bool TextFieldInputType::shouldSubmitImplicitly(Event& event)
{
    return (event.type() == eventNames().textInputEvent && is<TextEvent>(event) && downcast<TextEvent>(event).data() == "\n")
        || InputType::shouldSubmitImplicitly(event);
}

RenderPtr<RenderElement> TextFieldInputType::createInputRenderer(RenderStyle&& style)
{
    ASSERT(element());
    return createRenderer<RenderTextControlSingleLine>(*element(), WTFMove(style));
}

bool TextFieldInputType::needsContainer() const
{
    return false;
}

bool TextFieldInputType::shouldHaveSpinButton() const
{
    ASSERT(element());
    return RenderTheme::singleton().shouldHaveSpinButton(*element());
}

bool TextFieldInputType::shouldHaveCapsLockIndicator() const
{
    ASSERT(element());
    return RenderTheme::singleton().shouldHaveCapsLockIndicator(*element());
}

void TextFieldInputType::createShadowSubtree()
{
    ASSERT(element());
    ASSERT(element()->shadowRoot());

    ASSERT(!m_innerText);
    ASSERT(!m_innerBlock);
    ASSERT(!m_innerSpinButton);
    ASSERT(!m_capsLockIndicator);
    ASSERT(!m_autoFillButton);

    Document& document = element()->document();
    bool shouldHaveSpinButton = this->shouldHaveSpinButton();
    bool shouldHaveCapsLockIndicator = this->shouldHaveCapsLockIndicator();
    bool createsContainer = shouldHaveSpinButton || shouldHaveCapsLockIndicator || needsContainer();

    m_innerText = TextControlInnerTextElement::create(document);

    if (!createsContainer) {
        element()->userAgentShadowRoot()->appendChild(*m_innerText);
        updatePlaceholderText();
        return;
    }

    createContainer();
    updatePlaceholderText();

    if (shouldHaveSpinButton) {
        m_innerSpinButton = SpinButtonElement::create(document, *this);
        m_container->appendChild(*m_innerSpinButton);
    }

    if (shouldHaveCapsLockIndicator) {
        m_capsLockIndicator = HTMLDivElement::create(document);
        m_capsLockIndicator->setPseudo(AtomString("-webkit-caps-lock-indicator", AtomString::ConstructFromLiteral));

        bool shouldDrawCapsLockIndicator = this->shouldDrawCapsLockIndicator();
        m_capsLockIndicator->setInlineStyleProperty(CSSPropertyDisplay, shouldDrawCapsLockIndicator ? CSSValueBlock : CSSValueNone, true);

        m_container->appendChild(*m_capsLockIndicator);
    }
    updateAutoFillButton();
}

HTMLElement* TextFieldInputType::containerElement() const
{
    return m_container.get();
}

HTMLElement* TextFieldInputType::innerBlockElement() const
{
    return m_innerBlock.get();
}

RefPtr<TextControlInnerTextElement> TextFieldInputType::innerTextElement() const
{
    ASSERT(m_innerText);
    return m_innerText;
}

HTMLElement* TextFieldInputType::innerSpinButtonElement() const
{
    return m_innerSpinButton.get();
}

HTMLElement* TextFieldInputType::capsLockIndicatorElement() const
{
    return m_capsLockIndicator.get();
}

HTMLElement* TextFieldInputType::autoFillButtonElement() const
{
    return m_autoFillButton.get();
}

HTMLElement* TextFieldInputType::placeholderElement() const
{
    return m_placeholder.get();
}

void TextFieldInputType::destroyShadowSubtree()
{
    InputType::destroyShadowSubtree();
    m_innerText = nullptr;
    m_placeholder = nullptr;
    m_innerBlock = nullptr;
    if (m_innerSpinButton)
        m_innerSpinButton->removeSpinButtonOwner();
    m_innerSpinButton = nullptr;
    m_capsLockIndicator = nullptr;
    m_autoFillButton = nullptr;
#if ENABLE(DATALIST)
    m_dataListDropdownIndicator = nullptr;
#endif
    m_container = nullptr;
}

void TextFieldInputType::attributeChanged(const QualifiedName& name)
{
    if (name == valueAttr || name == placeholderAttr) {
        if (element())
            updateInnerTextValue();
    }
    InputType::attributeChanged(name);
}

void TextFieldInputType::disabledStateChanged()
{
    if (m_innerSpinButton)
        m_innerSpinButton->releaseCapture();
    capsLockStateMayHaveChanged();
    updateAutoFillButton();
}

void TextFieldInputType::readOnlyStateChanged()
{
    if (m_innerSpinButton)
        m_innerSpinButton->releaseCapture();
    capsLockStateMayHaveChanged();
    updateAutoFillButton();
}

bool TextFieldInputType::supportsReadOnly() const
{
    return true;
}

bool TextFieldInputType::shouldUseInputMethod() const
{
    return true;
}

#if ENABLE(DATALIST_ELEMENT)
void TextFieldInputType::createDataListDropdownIndicator()
{
    ASSERT(!m_dataListDropdownIndicator);
    if (!m_container)
        createContainer();

    ScriptDisallowedScope::EventAllowedScope allowedScope(*m_container);
    m_dataListDropdownIndicator = DataListButtonElement::create(element()->document(), *this);
    m_container->appendChild(*m_dataListDropdownIndicator);
    m_dataListDropdownIndicator->setPseudo(AtomString("-webkit-list-button", AtomString::ConstructFromLiteral));
    m_dataListDropdownIndicator->setInlineStyleProperty(CSSPropertyDisplay, CSSValueNone, true);

}
#endif

// FIXME: The name of this function doesn't make clear the two jobs it does:
// 1) Limits the string to a particular number of grapheme clusters.
// 2) Truncates the string at the first character which is a control character other than tab.
// FIXME: TextFieldInputType::sanitizeValue doesn't need a limit on grapheme clusters. A limit on code units would do.
// FIXME: Where does the "truncate at first control character" rule come from?
static String limitLength(const String& string, unsigned maxNumGraphemeClusters)
{
    StringView stringView { string };
    unsigned firstNonTabControlCharacterIndex = stringView.find([] (UChar character) {
        return character < ' ' && character != '\t';
    });
    unsigned limitedLength;
    if (stringView.is8Bit())
        limitedLength = std::min(firstNonTabControlCharacterIndex, maxNumGraphemeClusters);
    else
        limitedLength = numCodeUnitsInGraphemeClusters(stringView.substring(0, firstNonTabControlCharacterIndex), maxNumGraphemeClusters);
    return string.left(limitedLength);
}

static String autoFillButtonTypeToAccessibilityLabel(AutoFillButtonType autoFillButtonType)
{
    switch (autoFillButtonType) {
    case AutoFillButtonType::Contacts:
        return AXAutoFillContactsLabel();
    case AutoFillButtonType::Credentials:
        return AXAutoFillCredentialsLabel();
    case AutoFillButtonType::StrongPassword:
        return AXAutoFillStrongPasswordLabel();
    case AutoFillButtonType::CreditCard:
        return AXAutoFillCreditCardLabel();
    case AutoFillButtonType::None:
        ASSERT_NOT_REACHED();
        return { };
    }
    ASSERT_NOT_REACHED();
    return { };
}

static String autoFillButtonTypeToAutoFillButtonText(AutoFillButtonType autoFillButtonType)
{
    switch (autoFillButtonType) {
    case AutoFillButtonType::Contacts:
    case AutoFillButtonType::Credentials:
    case AutoFillButtonType::CreditCard:
        return emptyString();
    case AutoFillButtonType::StrongPassword:
        return autoFillStrongPasswordLabel();
    case AutoFillButtonType::None:
        ASSERT_NOT_REACHED();
        return { };
    }
    ASSERT_NOT_REACHED();
    return { };
}

static AtomString autoFillButtonTypeToAutoFillButtonPseudoClassName(AutoFillButtonType autoFillButtonType)
{
    switch (autoFillButtonType) {
    case AutoFillButtonType::Contacts:
        return { "-webkit-contacts-auto-fill-button", AtomString::ConstructFromLiteral };
    case AutoFillButtonType::Credentials:
        return { "-webkit-credentials-auto-fill-button", AtomString::ConstructFromLiteral };
    case AutoFillButtonType::StrongPassword:
        return { "-webkit-strong-password-auto-fill-button", AtomString::ConstructFromLiteral };
    case AutoFillButtonType::CreditCard:
        return { "-webkit-credit-card-auto-fill-button", AtomString::ConstructFromLiteral };
    case AutoFillButtonType::None:
        ASSERT_NOT_REACHED();
        return emptyAtom();
    }
    ASSERT_NOT_REACHED();
    return { };
}

static bool isAutoFillButtonTypeChanged(const AtomString& attribute, AutoFillButtonType autoFillButtonType)
{
    if (attribute == "-webkit-contacts-auto-fill-button" && autoFillButtonType != AutoFillButtonType::Contacts)
        return true;
    if (attribute == "-webkit-credentials-auto-fill-button" && autoFillButtonType != AutoFillButtonType::Credentials)
        return true;
    if (attribute == "-webkit-strong-password-auto-fill-button" && autoFillButtonType != AutoFillButtonType::StrongPassword)
        return true;
    if (attribute == "-webkit-credit-card-auto-fill-button" && autoFillButtonType != AutoFillButtonType::CreditCard)
        return true;
    return false;
}

String TextFieldInputType::sanitizeValue(const String& proposedValue) const
{
    return limitLength(proposedValue.removeCharacters(isHTMLLineBreak), HTMLInputElement::maxEffectiveLength);
}

void TextFieldInputType::handleBeforeTextInsertedEvent(BeforeTextInsertedEvent& event)
{
    ASSERT(element());
    // Make sure that the text to be inserted will not violate the maxLength.

    // We use RenderTextControlSingleLine::text() instead of InputElement::value()
    // because they can be mismatched by sanitizeValue() in
    // HTMLInputElement::subtreeHasChanged() in some cases.
    String innerText = element()->innerTextValue();
    unsigned oldLength = numGraphemeClusters(innerText);

    // selectionLength represents the selection length of this text field to be
    // removed by this insertion.
    // If the text field has no focus, we don't need to take account of the
    // selection length. The selection is the source of text drag-and-drop in
    // that case, and nothing in the text field will be removed.
    unsigned selectionLength = 0;
    if (element()->focused()) {
        ASSERT(enclosingTextFormControl(element()->document().frame()->selection().selection().start()) == element());
        int selectionStart = element()->selectionStart();
        ASSERT(selectionStart <= element()->selectionEnd());
        int selectionCodeUnitCount = element()->selectionEnd() - selectionStart;
        selectionLength = selectionCodeUnitCount ? numGraphemeClusters(StringView(innerText).substring(selectionStart, selectionCodeUnitCount)) : 0;
    }
    ASSERT(oldLength >= selectionLength);

    // Selected characters will be removed by the next text event.
    unsigned baseLength = oldLength - selectionLength;
    unsigned maxLength = isTextType() ? element()->effectiveMaxLength() : HTMLInputElement::maxEffectiveLength;
    unsigned appendableLength = maxLength > baseLength ? maxLength - baseLength : 0;

    // Truncate the inserted text to avoid violating the maxLength and other constraints.
    String eventText = event.text();
    unsigned textLength = eventText.length();
    while (textLength > 0 && isHTMLLineBreak(eventText[textLength - 1]))
        textLength--;
    eventText.truncate(textLength);
    eventText.replace("\r\n", " ");
    eventText.replace('\r', ' ');
    eventText.replace('\n', ' ');
    event.setText(limitLength(eventText, appendableLength));
}

bool TextFieldInputType::shouldRespectListAttribute()
{
#if ENABLE(DATALIST_ELEMENT)
    return RuntimeEnabledFeatures::sharedFeatures().dataListElementEnabled();
#else
    return InputType::themeSupportsDataListUI(this);
#endif
}

void TextFieldInputType::updatePlaceholderText()
{
    if (!supportsPlaceholder())
        return;
    ASSERT(element());
    String placeholderText = element()->strippedPlaceholder();
    if (placeholderText.isEmpty()) {
        if (m_placeholder) {
            m_placeholder->parentNode()->removeChild(*m_placeholder);
            m_placeholder = nullptr;
        }
        return;
    }
    if (!m_placeholder) {
        m_placeholder = TextControlPlaceholderElement::create(element()->document());
        element()->userAgentShadowRoot()->insertBefore(*m_placeholder, m_container ? m_container.get() : innerTextElement().get());
    }
    m_placeholder->setInnerText(placeholderText);
}

bool TextFieldInputType::appendFormData(DOMFormData& formData, bool multipart) const
{
    InputType::appendFormData(formData, multipart);
    ASSERT(element());
    auto& dirnameAttrValue = element()->attributeWithoutSynchronization(dirnameAttr);
    if (!dirnameAttrValue.isNull())
        formData.append(dirnameAttrValue, element()->directionForFormData());
    return true;
}

String TextFieldInputType::convertFromVisibleValue(const String& visibleValue) const
{
    return visibleValue;
}

void TextFieldInputType::subtreeHasChanged()
{
    ASSERT(element());
    element()->setChangedSinceLastFormControlChangeEvent(true);

    // We don't need to call sanitizeUserInputValue() function here because
    // HTMLInputElement::handleBeforeTextInsertedEvent() has already called
    // sanitizeUserInputValue().
    // ---
    // sanitizeValue() is needed because IME input doesn't dispatch BeforeTextInsertedEvent.
    // ---
    // Input types that support the selection API do *not* sanitize their
    // user input in order to retain parity between what's in the model and
    // what's on the screen. Otherwise, we retain the sanitization process for
    // backward compatibility. https://bugs.webkit.org/show_bug.cgi?id=150346
    String innerText = convertFromVisibleValue(element()->innerTextValue());
    if (!supportsSelectionAPI())
        innerText = sanitizeValue(innerText);
    element()->setValueFromRenderer(innerText);
    element()->updatePlaceholderVisibility();
    // Recalc for :invalid change.
    element()->invalidateStyleForSubtree();

    didSetValueByUserEdit();
}

void TextFieldInputType::didSetValueByUserEdit()
{
    ASSERT(element());
    if (!element()->focused())
        return;
    if (RefPtr<Frame> frame = element()->document().frame())
        frame->editor().textDidChangeInTextField(element());
#if ENABLE(DATALIST_ELEMENT)
#if PLATFORM(IOS_FAMILY)
    if (element()->list() && m_dataListDropdownIndicator)
        m_dataListDropdownIndicator->setInlineStyleProperty(CSSPropertyDisplay, suggestions().size() ? CSSValueBlock : CSSValueNone, true);
#endif
    if (element()->list())
        displaySuggestions(DataListSuggestionActivationType::TextChanged);
#endif
}

void TextFieldInputType::spinButtonStepDown()
{
    stepUpFromRenderer(-1);
}

void TextFieldInputType::spinButtonStepUp()
{
    stepUpFromRenderer(1);
}

void TextFieldInputType::updateInnerTextValue()
{
    ASSERT(element());
    if (!element()->formControlValueMatchesRenderer()) {
        // Update the renderer value if the formControlValueMatchesRenderer() flag is false.
        // It protects an unacceptable renderer value from being overwritten with the DOM value.
        element()->setInnerTextValue(visibleValue());
        element()->updatePlaceholderVisibility();
    }
}

void TextFieldInputType::focusAndSelectSpinButtonOwner()
{
    ASSERT(element());
    Ref<HTMLInputElement> input(*element());
    input->focus();
    input->select();
}

bool TextFieldInputType::shouldSpinButtonRespondToMouseEvents()
{
    ASSERT(element());
    return !element()->isDisabledOrReadOnly();
}

bool TextFieldInputType::shouldSpinButtonRespondToWheelEvents()
{
    ASSERT(element());
    return shouldSpinButtonRespondToMouseEvents() && element()->focused();
}

bool TextFieldInputType::shouldDrawCapsLockIndicator() const
{
    ASSERT(element());
    if (element()->document().focusedElement() != element())
        return false;

    if (element()->isDisabledOrReadOnly())
        return false;

    if (element()->hasAutoFillStrongPasswordButton())
        return false;

    RefPtr<Frame> frame = element()->document().frame();
    if (!frame)
        return false;

    if (!frame->selection().isFocusedAndActive())
        return false;

    return PlatformKeyboardEvent::currentCapsLockState();
}

void TextFieldInputType::capsLockStateMayHaveChanged()
{
    if (!m_capsLockIndicator)
        return;

    bool shouldDrawCapsLockIndicator = this->shouldDrawCapsLockIndicator();
    m_capsLockIndicator->setInlineStyleProperty(CSSPropertyDisplay, shouldDrawCapsLockIndicator ? CSSValueBlock : CSSValueNone, true);
}

bool TextFieldInputType::shouldDrawAutoFillButton() const
{
    ASSERT(element());
    return !element()->isDisabledOrReadOnly() && element()->autoFillButtonType() != AutoFillButtonType::None;
}

void TextFieldInputType::autoFillButtonElementWasClicked()
{
    ASSERT(element());
    Page* page = element()->document().page();
    if (!page)
        return;

    page->chrome().client().handleAutoFillButtonClick(*element());
}

void TextFieldInputType::createContainer()
{
    ASSERT(!m_container);
    ASSERT(element());

    ScriptDisallowedScope::EventAllowedScope allowedScope(*element()->userAgentShadowRoot());

    m_container = TextControlInnerContainer::create(element()->document());
    element()->userAgentShadowRoot()->appendChild(*m_container);
    m_container->setPseudo(AtomString("-webkit-textfield-decoration-container", AtomString::ConstructFromLiteral));

    m_innerBlock = TextControlInnerElement::create(element()->document());
    m_container->appendChild(*m_innerBlock);
    m_innerBlock->appendChild(*m_innerText);
}

void TextFieldInputType::createAutoFillButton(AutoFillButtonType autoFillButtonType)
{
    ASSERT(!m_autoFillButton);

    if (autoFillButtonType == AutoFillButtonType::None)
        return;

    ASSERT(element());
    m_autoFillButton = AutoFillButtonElement::create(element()->document(), *this);
    m_autoFillButton->setPseudo(autoFillButtonTypeToAutoFillButtonPseudoClassName(autoFillButtonType));
    m_autoFillButton->setAttributeWithoutSynchronization(roleAttr, AtomString("button", AtomString::ConstructFromLiteral));
    m_autoFillButton->setAttributeWithoutSynchronization(aria_labelAttr, autoFillButtonTypeToAccessibilityLabel(autoFillButtonType));
    m_autoFillButton->setTextContent(autoFillButtonTypeToAutoFillButtonText(autoFillButtonType));
    m_container->appendChild(*m_autoFillButton);
}

void TextFieldInputType::updateAutoFillButton()
{
    capsLockStateMayHaveChanged();

    if (shouldDrawAutoFillButton()) {
        if (!m_container)
            createContainer();

        ASSERT(element());
        AutoFillButtonType autoFillButtonType = element()->autoFillButtonType();
        if (!m_autoFillButton)
            createAutoFillButton(autoFillButtonType);

        const AtomString& attribute = m_autoFillButton->attributeWithoutSynchronization(pseudoAttr);
        bool shouldUpdateAutoFillButtonType = isAutoFillButtonTypeChanged(attribute, autoFillButtonType);
        if (shouldUpdateAutoFillButtonType) {
            m_autoFillButton->setPseudo(autoFillButtonTypeToAutoFillButtonPseudoClassName(autoFillButtonType));
            m_autoFillButton->setAttributeWithoutSynchronization(aria_labelAttr, autoFillButtonTypeToAccessibilityLabel(autoFillButtonType));
            m_autoFillButton->setTextContent(autoFillButtonTypeToAutoFillButtonText(autoFillButtonType));
        }
        m_autoFillButton->setInlineStyleProperty(CSSPropertyDisplay, CSSValueBlock, true);
        return;
    }
    
    if (m_autoFillButton)
        m_autoFillButton->setInlineStyleProperty(CSSPropertyDisplay, CSSValueNone, true);        
}

#if ENABLE(DATALIST_ELEMENT)

void TextFieldInputType::listAttributeTargetChanged()
{
    m_cachedSuggestions = std::make_pair(String(), Vector<String>());

    if (!m_dataListDropdownIndicator)
        createDataListDropdownIndicator();

#if !PLATFORM(IOS_FAMILY)
    m_dataListDropdownIndicator->setInlineStyleProperty(CSSPropertyDisplay, element()->list() ? CSSValueBlock : CSSValueNone, true);
#endif
}

HTMLElement* TextFieldInputType::dataListButtonElement() const
{
    return m_dataListDropdownIndicator.get();
}

void TextFieldInputType::dataListButtonElementWasClicked()
{
    if (element()->list())
        displaySuggestions(DataListSuggestionActivationType::IndicatorClicked);
}

IntRect TextFieldInputType::elementRectInRootViewCoordinates() const
{
    if (!element()->renderer())
        return IntRect();
    return element()->document().view()->contentsToRootView(element()->renderer()->absoluteBoundingBoxRect());
}

Vector<String> TextFieldInputType::suggestions()
{
    Vector<String> suggestions;
    Vector<String> matchesContainingValue;

    String elementValue = element()->value();

    if (!m_cachedSuggestions.first.isNull() && equalIgnoringASCIICase(m_cachedSuggestions.first, elementValue))
        return m_cachedSuggestions.second;

    if (auto dataList = element()->dataList()) {
        Ref<HTMLCollection> options = dataList->options();
        for (unsigned i = 0; auto* option = downcast<HTMLOptionElement>(options->item(i)); ++i) {
            if (!element()->isValidValue(option->value()))
                continue;

            String value = sanitizeValue(option->value());
            if (elementValue.isEmpty())
                suggestions.append(value);
            else if (value.startsWithIgnoringASCIICase(elementValue))
                suggestions.append(value);
            else if (value.containsIgnoringASCIICase(elementValue))
                matchesContainingValue.append(value);
        }
    }

    suggestions.appendVector(matchesContainingValue);
    m_cachedSuggestions = std::make_pair(elementValue, suggestions);

    return suggestions;
}

void TextFieldInputType::didSelectDataListOption(const String& selectedOption)
{
    element()->setValue(selectedOption, DispatchInputAndChangeEvent);
}

void TextFieldInputType::didCloseSuggestions()
{
    m_cachedSuggestions = std::make_pair(String(), Vector<String>());
    m_suggestionPicker = nullptr;
    if (element()->renderer())
        element()->renderer()->repaint();
}

void TextFieldInputType::displaySuggestions(DataListSuggestionActivationType type)
{
    if (element()->isDisabledFormControl() || !element()->renderer())
        return;

    if (!UserGestureIndicator::processingUserGesture() && type != DataListSuggestionActivationType::TextChanged)
        return;

    if (!m_suggestionPicker && suggestions().size() > 0)
        m_suggestionPicker = chrome()->createDataListSuggestionPicker(*this);

    if (!m_suggestionPicker)
        return;

    m_suggestionPicker->displayWithActivationType(type);
}

void TextFieldInputType::closeSuggestions()
{
    if (m_suggestionPicker)
        m_suggestionPicker->close();
}

bool TextFieldInputType::isPresentingAttachedView() const
{
    return !!m_suggestionPicker;
}

#endif

} // namespace WebCore