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

DEFINITIONS

1. makeVisibleEmptyValue
2. m_maximumIndex
3. maximumWidth
4. handleKeyboardEvent
5. hasValue
6. initialize
7. setEmptyValue
8. setValueAsInteger
9. stepDown
10. stepUp
11. value
12. valueAsInteger
13. valueForARIAValueNow
14. visibleEmptyValue
15. visibleValue
16. indexOfSelectedOption
17. optionCount
18. optionAtIndex

/*
 * 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/DateTimeSymbolicFieldElement.h"

#include "core/events/KeyboardEvent.h"
#include "platform/fonts/Font.h"
#include "platform/text/TextBreakIterator.h"
#include "wtf/text/StringBuilder.h"
#include "wtf/unicode/Unicode.h"

namespace WebCore {

static AtomicString makeVisibleEmptyValue(const Vector<String>& symbols)
{
    unsigned maximumLength = 0;
    for (unsigned index = 0; index < symbols.size(); ++index)
        maximumLength = std::max(maximumLength, numGraphemeClusters(symbols[index]));
    StringBuilder builder;
    builder.reserveCapacity(maximumLength);
    for (unsigned length = 0; length < maximumLength; ++length)
        builder.append('-');
    return builder.toAtomicString();
}

DateTimeSymbolicFieldElement::DateTimeSymbolicFieldElement(Document& document, FieldOwner& fieldOwner, const Vector<String>& symbols, int minimum, int maximum)
    : DateTimeFieldElement(document, fieldOwner)
    , m_symbols(symbols)
    , m_visibleEmptyValue(makeVisibleEmptyValue(symbols))
    , m_selectedIndex(-1)
    , m_typeAhead(this)
    , m_minimumIndex(minimum)
    , m_maximumIndex(maximum)
{
    ASSERT(!symbols.isEmpty());
    ASSERT(m_minimumIndex >= 0);
    ASSERT_WITH_SECURITY_IMPLICATION(m_maximumIndex < static_cast<int>(m_symbols.size()));
    ASSERT(m_minimumIndex <= m_maximumIndex);
}

float DateTimeSymbolicFieldElement::maximumWidth(const Font& font)
{
    float maximumWidth = font.width(visibleEmptyValue());
    for (unsigned index = 0; index < m_symbols.size(); ++index)
        maximumWidth = std::max(maximumWidth, font.width(m_symbols[index]));
    return maximumWidth + DateTimeFieldElement::maximumWidth(font);
}

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

    const UChar charCode = WTF::Unicode::toLower(keyboardEvent->charCode());
    if (charCode < ' ')
        return;

    keyboardEvent->setDefaultHandled();

    int index = m_typeAhead.handleEvent(keyboardEvent, TypeAhead::MatchPrefix | TypeAhead::CycleFirstChar | TypeAhead::MatchIndex);
    if (index < 0)
        return;
    setValueAsInteger(index, DispatchEvent);
}

bool DateTimeSymbolicFieldElement::hasValue() const
{
    return m_selectedIndex >= 0;
}

void DateTimeSymbolicFieldElement::initialize(const AtomicString& pseudo, const String& axHelpText)
{
    // The minimum and maximum below are exposed to users, and 1-based numbers
    // are natural for symbolic fields. For example, the minimum value of a
    // month field should be 1, not 0.
    DateTimeFieldElement::initialize(pseudo, axHelpText, m_minimumIndex + 1, m_maximumIndex + 1);
}

void DateTimeSymbolicFieldElement::setEmptyValue(EventBehavior eventBehavior)
{
    if (isDisabled())
        return;
    m_selectedIndex = invalidIndex;
    updateVisibleValue(eventBehavior);
}

void DateTimeSymbolicFieldElement::setValueAsInteger(int newSelectedIndex, EventBehavior eventBehavior)
{
    m_selectedIndex = std::max(0, std::min(newSelectedIndex, static_cast<int>(m_symbols.size() - 1)));
    updateVisibleValue(eventBehavior);
}

void DateTimeSymbolicFieldElement::stepDown()
{
    if (hasValue()) {
        if (!indexIsInRange(--m_selectedIndex))
            m_selectedIndex = m_maximumIndex;
    } else
        m_selectedIndex = m_maximumIndex;
    updateVisibleValue(DispatchEvent);
}

void DateTimeSymbolicFieldElement::stepUp()
{
    if (hasValue()) {
        if (!indexIsInRange(++m_selectedIndex))
            m_selectedIndex = m_minimumIndex;
    } else
        m_selectedIndex = m_minimumIndex;
    updateVisibleValue(DispatchEvent);
}

String DateTimeSymbolicFieldElement::value() const
{
    return hasValue() ? m_symbols[m_selectedIndex] : emptyString();
}

int DateTimeSymbolicFieldElement::valueAsInteger() const
{
    return m_selectedIndex;
}

int DateTimeSymbolicFieldElement::valueForARIAValueNow() const
{
    // Synchronize with minimum/maximum adjustment in initialize().
    return m_selectedIndex + 1;
}

String DateTimeSymbolicFieldElement::visibleEmptyValue() const
{
    return m_visibleEmptyValue;
}

String DateTimeSymbolicFieldElement::visibleValue() const
{
    return hasValue() ? m_symbols[m_selectedIndex] : visibleEmptyValue();
}

int DateTimeSymbolicFieldElement::indexOfSelectedOption() const
{
    return m_selectedIndex;
}

int DateTimeSymbolicFieldElement::optionCount() const
{
    return m_symbols.size();
}

String DateTimeSymbolicFieldElement::optionAtIndex(int index) const
{
    return m_symbols[index];
}

} // namespace WebCore

#endif