Source/core/html/shadow/DateTimeNumericFieldElement.cpp

/*
 * 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
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 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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 */

#include "config.h"
#if ENABLE(INPUT_MULTIPLE_FIELDS_UI)
#include "core/html/shadow/DateTimeNumericFieldElement.h"

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

using namespace WTF::Unicode;

namespace blink {

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 blink

#endif