LegacyNumberInputType.cpp   [plain text]

/*
 * Copyright (C) 2011 Apple, Inc. All rights reserved.
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 * modification, are permitted provided that the following conditions are
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 *
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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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#include "config.h"
#include "LegacyNumberInputType.h"

#include "HTMLInputElement.h"
#include "HTMLNames.h"
#include "HTMLParserIdioms.h"
#include "KeyboardEvent.h"
#include "LocalizedNumber.h"
#include "RenderTextControl.h"
#include <limits>
#include <wtf/PassOwnPtr.h>

namespace WebCore {

using namespace HTMLNames;
using namespace std;

static const double numberDefaultStep = 1.0;
static const double numberStepScaleFactor = 1.0;

PassOwnPtr<InputType> LegacyNumberInputType::create(HTMLInputElement* element)
{
    return adoptPtr(new LegacyNumberInputType(element));
}

const AtomicString& LegacyNumberInputType::formControlType() const
{
    return InputTypeNames::number();
}

bool LegacyNumberInputType::shouldRespectSpeechAttribute()
{
    return true;
}

double LegacyNumberInputType::valueAsNumber() const
{
    return parseToDouble(element()->value(), numeric_limits<double>::quiet_NaN());
}

void LegacyNumberInputType::setValueAsNumber(double newValue, ExceptionCode& ec) const
{
    if (newValue < -numeric_limits<float>::max()) {
        ec = INVALID_STATE_ERR;
        return;
    }
    if (newValue > numeric_limits<float>::max()) {
        ec = INVALID_STATE_ERR;
        return;
    }
    element()->setValue(serialize(newValue));
}

bool LegacyNumberInputType::rangeUnderflow(const String& value) const
{
    const double nan = numeric_limits<double>::quiet_NaN();
    double doubleValue = parseToDouble(value, nan);
    return isfinite(doubleValue) && doubleValue < minimum();
}

bool LegacyNumberInputType::rangeOverflow(const String& value) const
{
    const double nan = numeric_limits<double>::quiet_NaN();
    double doubleValue = parseToDouble(value, nan);
    return isfinite(doubleValue) && doubleValue > maximum();
}

bool LegacyNumberInputType::supportsRangeLimitation() const
{
    return false;
}

double LegacyNumberInputType::minimum() const
{
    return parseToDouble(element()->fastGetAttribute(minAttr), -numeric_limits<float>::max());
}

double LegacyNumberInputType::maximum() const
{
    return parseToDouble(element()->fastGetAttribute(maxAttr), numeric_limits<float>::max());
}

bool LegacyNumberInputType::isSteppable() const
{
    return true;
}

bool LegacyNumberInputType::stepMismatch(const String& value, double step) const
{
    double doubleValue;
    if (!parseToDoubleForNumberType(value, &doubleValue))
        return false;
    doubleValue = fabs(doubleValue - stepBase());
    if (isinf(doubleValue))
        return false;
    // double's fractional part size is DBL_MAN_DIG-bit. If the current value
    // is greater than step*2^DBL_MANT_DIG, the following computation for
    // remainder makes no sense.
    if (doubleValue / pow(2.0, DBL_MANT_DIG) > step)
        return false;
    // The computation follows HTML5 4.10.7.2.10 `The step attribute' :
    // ... that number subtracted from the step base is not an integral multiple
    // of the allowed value step, the element is suffering from a step mismatch.
    double remainder = fabs(doubleValue - step * round(doubleValue / step));
    // Accepts erros in lower fractional part which IEEE 754 single-precision
    // can't represent.
    double computedAcceptableError = acceptableError(step);
    return computedAcceptableError < remainder && remainder < (step - computedAcceptableError);
}

double LegacyNumberInputType::stepBase() const
{
    return parseToDouble(element()->fastGetAttribute(minAttr), defaultStepBase());
}

double LegacyNumberInputType::stepBaseWithDecimalPlaces(unsigned* decimalPlaces) const
{
    return parseToDoubleWithDecimalPlaces(element()->fastGetAttribute(minAttr), defaultStepBase(), decimalPlaces);
}

double LegacyNumberInputType::defaultStep() const
{
    return numberDefaultStep;
}

double LegacyNumberInputType::stepScaleFactor() const
{
    return numberStepScaleFactor;
}

void LegacyNumberInputType::handleKeydownEvent(KeyboardEvent* event)
{
    handleKeydownEventForSpinButton(event);
    if (!event->defaultHandled())
        TextFieldInputType::handleKeydownEvent(event);
}

void LegacyNumberInputType::handleWheelEvent(WheelEvent* event)
{
    handleWheelEventForSpinButton(event);
}

double LegacyNumberInputType::parseToDouble(const String& src, double defaultValue) const
{
    double numberValue;
    if (!parseToDoubleForNumberType(src, &numberValue))
        return defaultValue;
    ASSERT(isfinite(numberValue));
    return numberValue;
}

double LegacyNumberInputType::parseToDoubleWithDecimalPlaces(const String& src, double defaultValue, unsigned *decimalPlaces) const
{
    double numberValue;
    if (!parseToDoubleForNumberTypeWithDecimalPlaces(src, &numberValue, decimalPlaces))
        return defaultValue;
    ASSERT(isfinite(numberValue));
    return numberValue;
}

String LegacyNumberInputType::serialize(double value) const
{
    if (!isfinite(value))
        return String();
    return serializeForNumberType(value);
}

double LegacyNumberInputType::acceptableError(double step) const
{
    return step / pow(2.0, FLT_MANT_DIG);
}

void LegacyNumberInputType::handleBlurEvent()
{
    // Reset the renderer value, which might be unmatched with the element value.
    element()->setFormControlValueMatchesRenderer(false);

    // We need to reset the renderer value explicitly because an unacceptable
    // renderer value should be purged before style calculation.
    if (element()->renderer())
        element()->renderer()->updateFromElement();
}

bool LegacyNumberInputType::isNumberField() const
{
    return true;
}

bool LegacyNumberInputType::isTextType() const
{
    // Pretend to also be a text field for maxlength.
    return true;
}

bool LegacyNumberInputType::supportsPlaceholder() const
{
    return true;
}

} // namespace WebCore