third_party/WebKit/Source/core/html/forms/CheckboxInputType.cpp

/*
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 * Copyright (C) 2011 Apple Inc. All rights reserved.
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#include "core/html/forms/CheckboxInputType.h"

#include "core/InputTypeNames.h"
#include "core/events/KeyboardEvent.h"
#include "core/html/HTMLInputElement.h"
#include "platform/text/PlatformLocale.h"
#include "wtf/PassOwnPtr.h"

namespace blink {

InputType* CheckboxInputType::create(HTMLInputElement& element)
{
    return new CheckboxInputType(element);
}

const AtomicString& CheckboxInputType::formControlType() const
{
    return InputTypeNames::checkbox;
}

bool CheckboxInputType::valueMissing(const String&) const
{
    return element().isRequired() && !element().checked();
}

String CheckboxInputType::valueMissingText() const
{
    return locale().queryString(WebLocalizedString::ValidationValueMissingForCheckbox);
}

void CheckboxInputType::handleKeyupEvent(KeyboardEvent* event)
{
    const String& key = event->key();
    if (key != " ")
        return;
    dispatchSimulatedClickIfActive(event);
}

ClickHandlingState* CheckboxInputType::willDispatchClick()
{
    // An event handler can use preventDefault or "return false" to reverse the checking we do here.
    // The ClickHandlingState object contains what we need to undo what we did here in didDispatchClick.

    ClickHandlingState* state = new ClickHandlingState;

    state->checked = element().checked();
    state->indeterminate = element().indeterminate();

    if (state->indeterminate)
        element().setIndeterminate(false);

    element().setChecked(!state->checked, DispatchChangeEvent);
    m_isInClickHandler = true;
    return state;
}

void CheckboxInputType::didDispatchClick(Event* event, const ClickHandlingState& state)
{
    if (event->defaultPrevented() || event->defaultHandled()) {
        element().setIndeterminate(state.indeterminate);
        element().setChecked(state.checked);
    } else {
        element().dispatchChangeEventIfNeeded();
    }
    m_isInClickHandler = false;
    // The work we did in willDispatchClick was default handling.
    event->setDefaultHandled();
}

bool CheckboxInputType::shouldAppearIndeterminate() const
{
    return element().indeterminate();
}

} // namespace blink