third_party/WebKit/Source/core/html/HTMLOutputElement.cpp

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 * modification, are permitted provided that the following conditions are
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 *
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 * notice, this list of conditions and the following disclaimer.
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 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
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 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
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 * 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
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 */

#include "core/html/HTMLOutputElement.h"

#include "bindings/core/v8/ExceptionStatePlaceholder.h"
#include "core/HTMLNames.h"

namespace blink {

inline HTMLOutputElement::HTMLOutputElement(Document& document, HTMLFormElement* form)
    : HTMLFormControlElement(HTMLNames::outputTag, document, form)
    , m_isDefaultValueMode(true)
    , m_defaultValue("")
    , m_tokens(DOMSettableTokenList::create(this))
{
}

HTMLOutputElement::~HTMLOutputElement()
{
#if !ENABLE(OILPAN)
    m_tokens->setObserver(nullptr);
#endif
}

PassRefPtrWillBeRawPtr<HTMLOutputElement> HTMLOutputElement::create(Document& document, HTMLFormElement* form)
{
    return adoptRefWillBeNoop(new HTMLOutputElement(document, form));
}

const AtomicString& HTMLOutputElement::formControlType() const
{
    DEFINE_STATIC_LOCAL(const AtomicString, output, ("output", AtomicString::ConstructFromLiteral));
    return output;
}

bool HTMLOutputElement::supportsFocus() const
{
    return HTMLElement::supportsFocus();
}

void HTMLOutputElement::parseAttribute(const QualifiedName& name, const AtomicString& oldValue, const AtomicString& value)
{
    if (name == HTMLNames::forAttr)
        setFor(value);
    else
        HTMLFormControlElement::parseAttribute(name, oldValue, value);
}

DOMSettableTokenList* HTMLOutputElement::htmlFor() const
{
    return m_tokens.get();
}

void HTMLOutputElement::setFor(const AtomicString& value)
{
    m_tokens->setValue(value);
}

void HTMLOutputElement::childrenChanged(const ChildrenChange& change)
{
    HTMLFormControlElement::childrenChanged(change);

    if (m_isDefaultValueMode)
        m_defaultValue = textContent();
}

void HTMLOutputElement::resetImpl()
{
    // The reset algorithm for output elements is to set the element's
    // value mode flag to "default" and then to set the element's textContent
    // attribute to the default value.
    if (m_defaultValue == value())
        return;
    setTextContent(m_defaultValue);
    m_isDefaultValueMode = true;
}

String HTMLOutputElement::value() const
{
    return textContent();
}

void HTMLOutputElement::setValue(const String& value)
{
    // The value mode flag set to "value" when the value attribute is set.
    m_isDefaultValueMode = false;
    if (value == this->value())
        return;
    setTextContent(value);
}

void HTMLOutputElement::valueWasSet()
{
    setSynchronizedLazyAttribute(HTMLNames::forAttr, m_tokens->value());
}

String HTMLOutputElement::defaultValue() const
{
    return m_defaultValue;
}

void HTMLOutputElement::setDefaultValue(const String& value)
{
    if (m_defaultValue == value)
        return;
    m_defaultValue = value;
    // The spec requires the value attribute set to the default value
    // when the element's value mode flag to "default".
    if (m_isDefaultValueMode)
        setTextContent(value);
}


DEFINE_TRACE(HTMLOutputElement)
{
    visitor->trace(m_tokens);
    HTMLFormControlElement::trace(visitor);
    DOMSettableTokenListObserver::trace(visitor);
}

} // namespace