root/Source/core/html/shadow/DateTimeNumericFieldElement.cpp

DEFINITIONS

1. clampValue
2. isInRange
3. m_hasValue
4. maximumWidth
5. defaultValueForStepDown
6. defaultValueForStepUp
7. setFocus
8. formatValue
9. handleKeyboardEvent
10. hasValue
11. initialize
12. maximum
13. setEmptyValue
14. setValueAsInteger
15. stepDown
16. stepUp
17. value
18. valueAsInteger
19. typeAheadValue
20. visibleValue
21. roundDown
22. roundUp

/*
 * Copyright (C) 2012 Google 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:
 * 1.  Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 * 2.  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.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS 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 APPLE INC. OR ITS 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"
#if ENABLE(INPUT_MULTIPLE_FIELDS_UI)
#include "core/html/shadow/DateTimeNumericFieldElement.h"

#include "CSSPropertyNames.h"
#include "CSSValueKeywords.h"
#include "core/events/KeyboardEvent.h"
#include "platform/fonts/Font.h"
#include "platform/text/PlatformLocale.h"

using namespace WTF::Unicode;

namespace WebCore {

int DateTimeNumericFieldElement::Range::clampValue(int value) const
{
    return std::min(std::max(value, minimum), maximum);
}

bool DateTimeNumericFieldElement::Range::isInRange(int value) const
{
    return value >= minimum && value <= maximum;
}

// ----------------------------

DateTimeNumericFieldElement::DateTimeNumericFieldElement(Document& document, FieldOwner& fieldOwner, const Range& range, const Range& hardLimits, const String& placeholder, const DateTimeNumericFieldElement::Step& step)
    : DateTimeFieldElement(document, fieldOwner)
    , m_placeholder(placeholder)
    , m_range(range)
    , m_hardLimits(hardLimits)
    , m_step(step)
    , m_value(0)
    , m_hasValue(false)
{
    ASSERT(m_step.step);
    ASSERT(m_range.minimum <= m_range.maximum);
    ASSERT(m_hardLimits.minimum <= m_hardLimits.maximum);

    // We show a direction-neutral string such as "--" as a placeholder. It
    // should follow the direction of numeric values.
    if (localeForOwner().isRTL()) {
        Direction dir = direction(formatValue(this->maximum())[0]);
        if (dir == LeftToRight || dir == EuropeanNumber || dir == ArabicNumber) {
            setInlineStyleProperty(CSSPropertyUnicodeBidi, CSSValueBidiOverride);
            setInlineStyleProperty(CSSPropertyDirection, CSSValueLtr);
        }
    }
}

float DateTimeNumericFieldElement::maximumWidth(const Font& font)
{
    float maximumWidth = font.width(m_placeholder);
    maximumWidth = std::max(maximumWidth, font.width(formatValue(maximum())));
    maximumWidth = std::max(maximumWidth, font.width(value()));
    return maximumWidth + DateTimeFieldElement::maximumWidth(font);
}

int DateTimeNumericFieldElement::defaultValueForStepDown() const
{
    return m_range.maximum;
}

int DateTimeNumericFieldElement::defaultValueForStepUp() const
{
    return m_range.minimum;
}

void DateTimeNumericFieldElement::setFocus(bool value)
{
    if (!value) {
        int value = typeAheadValue();
        m_typeAheadBuffer.clear();
        if (value >= 0)
            setValueAsInteger(value, DispatchEvent);
    }
    DateTimeFieldElement::setFocus(value);
}

String DateTimeNumericFieldElement::formatValue(int value) const
{
    Locale& locale = localeForOwner();
    if (m_hardLimits.maximum > 999)
        return locale.convertToLocalizedNumber(String::format("%04d", value));
    if (m_hardLimits.maximum > 99)
        return locale.convertToLocalizedNumber(String::format("%03d", value));
    return locale.convertToLocalizedNumber(String::format("%02d", value));
}

void DateTimeNumericFieldElement::handleKeyboardEvent(KeyboardEvent* keyboardEvent)
{
    ASSERT(!isDisabled());
    if (keyboardEvent->type() != EventTypeNames::keypress)
        return;

    UChar charCode = static_cast<UChar>(keyboardEvent->charCode());
    String number = localeForOwner().convertFromLocalizedNumber(String(&charCode, 1));
    const int digit = number[0] - '0';
    if (digit < 0 || digit > 9)
        return;

    unsigned maximumLength = DateTimeNumericFieldElement::formatValue(m_range.maximum).length();
    if (m_typeAheadBuffer.length() >= maximumLength) {
        String current = m_typeAheadBuffer.toString();
        m_typeAheadBuffer.clear();
        unsigned desiredLength = maximumLength - 1;
        m_typeAheadBuffer.append(current, current.length() - desiredLength, desiredLength);
    }
    m_typeAheadBuffer.append(number);
    int newValue = typeAheadValue();
    if (newValue >= m_hardLimits.minimum)
        setValueAsInteger(newValue, DispatchEvent);
    else {
        m_hasValue = false;
        updateVisibleValue(DispatchEvent);
    }

    if (m_typeAheadBuffer.length() >= maximumLength || newValue * 10 > m_range.maximum)
        focusOnNextField();

    keyboardEvent->setDefaultHandled();
}

bool DateTimeNumericFieldElement::hasValue() const
{
    return m_hasValue;
}

void DateTimeNumericFieldElement::initialize(const AtomicString& pseudo, const String& axHelpText)
{
    DateTimeFieldElement::initialize(pseudo, axHelpText, m_range.minimum, m_range.maximum);
}

int DateTimeNumericFieldElement::maximum() const
{
    return m_range.maximum;
}

void DateTimeNumericFieldElement::setEmptyValue(EventBehavior eventBehavior)
{
    if (isDisabled())
        return;

    m_hasValue = false;
    m_value = 0;
    m_typeAheadBuffer.clear();
    updateVisibleValue(eventBehavior);
}

void DateTimeNumericFieldElement::setValueAsInteger(int value, EventBehavior eventBehavior)
{
    m_value = m_hardLimits.clampValue(value);
    m_hasValue = true;
    updateVisibleValue(eventBehavior);
}

void DateTimeNumericFieldElement::stepDown()
{
    int newValue = roundDown(m_hasValue ? m_value - 1 : defaultValueForStepDown());
    if (!m_range.isInRange(newValue))
        newValue = roundDown(m_range.maximum);
    m_typeAheadBuffer.clear();
    setValueAsInteger(newValue, DispatchEvent);
}

void DateTimeNumericFieldElement::stepUp()
{
    int newValue = roundUp(m_hasValue ? m_value + 1 : defaultValueForStepUp());
    if (!m_range.isInRange(newValue))
        newValue = roundUp(m_range.minimum);
    m_typeAheadBuffer.clear();
    setValueAsInteger(newValue, DispatchEvent);
}

String DateTimeNumericFieldElement::value() const
{
    return m_hasValue ? formatValue(m_value) : emptyString();
}

int DateTimeNumericFieldElement::valueAsInteger() const
{
    return m_hasValue ? m_value : -1;
}

int DateTimeNumericFieldElement::typeAheadValue() const
{
    if (m_typeAheadBuffer.length())
        return m_typeAheadBuffer.toString().toInt();
    return -1;
}

String DateTimeNumericFieldElement::visibleValue() const
{
    if (m_typeAheadBuffer.length())
        return formatValue(typeAheadValue());
    return m_hasValue ? value() : m_placeholder;
}

int DateTimeNumericFieldElement::roundDown(int n) const
{
    n -= m_step.stepBase;
    if (n >= 0)
        n = n / m_step.step * m_step.step;
    else
        n = -((-n + m_step.step - 1) / m_step.step * m_step.step);
    return n + m_step.stepBase;
}

int DateTimeNumericFieldElement::roundUp(int n) const
{
    n -= m_step.stepBase;
    if (n >= 0)
        n = (n + m_step.step - 1) / m_step.step * m_step.step;
    else
        n = -(-n / m_step.step * m_step.step);
    return n + m_step.stepBase;
}

} // namespace WebCore

#endif