qlinecontrol.cpp

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#include "qlinecontrol_p.h"

#ifndef QT_NO_LINEEDIT

#include "qabstractitemview.h"
#include "qclipboard.h"
#ifndef QT_NO_ACCESSIBILITY
#include "qaccessible.h"
#endif
#ifndef QT_NO_IM
#include "qinputcontext.h"
#include "qlist.h"
#endif
#include "qapplication.h"
#ifndef QT_NO_GRAPHICSVIEW
#include "qgraphicssceneevent.h"
#endif

QT_BEGIN_NAMESPACE

#ifdef QT_GUI_PASSWORD_ECHO_DELAY
static const int qt_passwordEchoDelay = QT_GUI_PASSWORD_ECHO_DELAY;
#endif

void QLineControl::updateDisplayText(bool forceUpdate)
{
    QString orig = m_textLayout.text();
    QString str;
    if (m_echoMode == QLineEdit::NoEcho)
        str = QString::fromLatin1("");
    else
        str = m_text;

    if (m_echoMode == QLineEdit::Password) {
        str.fill(m_passwordCharacter);
#ifdef QT_GUI_PASSWORD_ECHO_DELAY
        if (m_passwordEchoTimer != 0 && m_cursor > 0 && m_cursor <= m_text.length()) {
            int cursor = m_cursor - 1;
            QChar uc = m_text.at(cursor);
            str[cursor] = uc;
            if (cursor > 0 && uc.unicode() >= 0xdc00 && uc.unicode() < 0xe000) {
                // second half of a surrogate, check if we have the first half as well,
                // if yes restore both at once
                uc = m_text.at(cursor - 1);
                if (uc.unicode() >= 0xd800 && uc.unicode() < 0xdc00)
                    str[cursor - 1] = uc;
            }
        }
#endif
    } else if (m_echoMode == QLineEdit::PasswordEchoOnEdit && !m_passwordEchoEditing) {
        str.fill(m_passwordCharacter);
    }

    // replace certain non-printable characters with spaces (to avoid
    // drawing boxes when using fonts that don't have glyphs for such
    // characters)
    QChar* uc = str.data();
    for (int i = 0; i < (int)str.length(); ++i) {
        if ((uc[i] < 0x20 && uc[i] != 0x09)
            || uc[i] == QChar::LineSeparator
            || uc[i] == QChar::ParagraphSeparator
            || uc[i] == QChar::ObjectReplacementCharacter)
            uc[i] = QChar(0x0020);
    }

    m_textLayout.setText(str);

    QTextOption option;
    option.setTextDirection(m_layoutDirection);
    option.setFlags(QTextOption::IncludeTrailingSpaces);
    m_textLayout.setTextOption(option);

    m_textLayout.beginLayout();
    QTextLine l = m_textLayout.createLine();
    m_textLayout.endLayout();
    m_ascent = qRound(l.ascent());

    if (str != orig || forceUpdate)
        emit displayTextChanged(str);
}

#ifndef QT_NO_CLIPBOARD

void QLineControl::copy(QClipboard::Mode mode) const
{
    QString t = selectedText();
    if (!t.isEmpty() && m_echoMode == QLineEdit::Normal) {
        disconnect(QApplication::clipboard(), SIGNAL(selectionChanged()), this, 0);
        QApplication::clipboard()->setText(t, mode);
        connect(QApplication::clipboard(), SIGNAL(selectionChanged()),
                   this, SLOT(_q_clipboardChanged()));
    }
}

void QLineControl::paste(QClipboard::Mode clipboardMode)
{
    QString clip = QApplication::clipboard()->text(clipboardMode);
    if (!clip.isEmpty() || hasSelectedText()) {
        separate(); //make it a separate undo/redo command
        insert(clip);
        separate();
    }
}

#endif // !QT_NO_CLIPBOARD

void QLineControl::backspace()
{
    int priorState = m_undoState;
    if (hasSelectedText()) {
        removeSelectedText();
    } else if (m_cursor) {
            --m_cursor;
            if (m_maskData)
                m_cursor = prevMaskBlank(m_cursor);
            if (m_cursor > 0 && m_text.at(m_cursor).isLowSurrogate()) {
                // second half of a surrogate, check if we have the first half as well,
                // if yes delete both at once
                if (m_text.at(m_cursor - 1).isHighSurrogate()) {
                    internalDelete(true);
                    --m_cursor;
                }
            }
            internalDelete(true);
    }
    finishChange(priorState);
}

void QLineControl::del()
{
    int priorState = m_undoState;
    if (hasSelectedText()) {
        removeSelectedText();
    } else {
        int n = m_textLayout.nextCursorPosition(m_cursor) - m_cursor;
        while (n--)
            internalDelete();
    }
    finishChange(priorState);
}

void QLineControl::insert(const QString &newText)
{
    int priorState = m_undoState;
    removeSelectedText();
    internalInsert(newText);
    finishChange(priorState);
}

void QLineControl::clear()
{
    int priorState = m_undoState;
    m_selstart = 0;
    m_selend = m_text.length();
    removeSelectedText();
    separate();
    finishChange(priorState, /*update*/false, /*edited*/false);
}

void QLineControl::setSelection(int start, int length)
{
    if(start < 0 || start > (int)m_text.length()){
        qWarning("QLineControl::setSelection: Invalid start position");
        return;
    }

    if (length > 0) {
        if (start == m_selstart && start + length == m_selend && m_cursor == m_selend)
            return;
        m_selstart = start;
        m_selend = qMin(start + length, (int)m_text.length());
        m_cursor = m_selend;
    } else if (length < 0){
        if (start == m_selend && start + length == m_selstart && m_cursor == m_selstart)
            return;
        m_selstart = qMax(start + length, 0);
        m_selend = start;
        m_cursor = m_selstart;
    } else if (m_selstart != m_selend) {
        m_selstart = 0;
        m_selend = 0;
        m_cursor = start;
    } else {
        m_cursor = start;
        emitCursorPositionChanged();
        return;
    }
    emit selectionChanged();
    emitCursorPositionChanged();
}

void QLineControl::_q_clipboardChanged()
{
}

void QLineControl::_q_deleteSelected()
{
    if (!hasSelectedText())
        return;

    int priorState = m_undoState;
    emit resetInputContext();
    removeSelectedText();
    separate();
    finishChange(priorState);
}

void QLineControl::init(const QString &txt)
{
    m_text = txt;
    updateDisplayText();
    m_cursor = m_text.length();
}

void QLineControl::updatePasswordEchoEditing(bool editing)
{
    cancelPasswordEchoTimer();
    m_passwordEchoEditing = editing;
    updateDisplayText();
}

int QLineControl::xToPos(int x, QTextLine::CursorPosition betweenOrOn) const
{
    return m_textLayout.lineAt(0).xToCursor(x, betweenOrOn);
}

QRect QLineControl::cursorRect() const
{
    QTextLine l = m_textLayout.lineAt(0);
    int c = m_cursor;
    if (m_preeditCursor != -1)
        c += m_preeditCursor;
    int cix = qRound(l.cursorToX(c));
    int w = m_cursorWidth;
    int ch = l.height() + 1;

    return QRect(cix-5, 0, w+9, ch);
}

bool QLineControl::fixup() // this function assumes that validate currently returns != Acceptable
{
#ifndef QT_NO_VALIDATOR
    if (m_validator) {
        QString textCopy = m_text;
        int cursorCopy = m_cursor;
        m_validator->fixup(textCopy);
        if (m_validator->validate(textCopy, cursorCopy) == QValidator::Acceptable) {
            if (textCopy != m_text || cursorCopy != m_cursor)
                internalSetText(textCopy, cursorCopy);
            return true;
        }
    }
#endif
    return false;
}

void QLineControl::moveCursor(int pos, bool mark)
{
    if (pos != m_cursor) {
        separate();
        if (m_maskData)
            pos = pos > m_cursor ? nextMaskBlank(pos) : prevMaskBlank(pos);
    }
    if (mark) {
        int anchor;
        if (m_selend > m_selstart && m_cursor == m_selstart)
            anchor = m_selend;
        else if (m_selend > m_selstart && m_cursor == m_selend)
            anchor = m_selstart;
        else
            anchor = m_cursor;
        m_selstart = qMin(anchor, pos);
        m_selend = qMax(anchor, pos);
        updateDisplayText();
    } else {
        internalDeselect();
    }
    m_cursor = pos;
    if (mark || m_selDirty) {
        m_selDirty = false;
        emit selectionChanged();
    }
    emitCursorPositionChanged();
}

void QLineControl::processInputMethodEvent(QInputMethodEvent *event)
{
    int priorState = 0;
    int originalSelectionStart = m_selstart;
    int originalSelectionEnd = m_selend;
    bool isGettingInput = !event->commitString().isEmpty()
            || event->preeditString() != preeditAreaText()
            || event->replacementLength() > 0;
    bool cursorPositionChanged = false;
    bool selectionChange = false;

    if (isGettingInput) {
        // If any text is being input, remove selected text.
        priorState = m_undoState;
        if (echoMode() == QLineEdit::PasswordEchoOnEdit && !passwordEchoEditing()) {
            updatePasswordEchoEditing(true);
            m_selstart = 0;
            m_selend = m_text.length();
        }
        removeSelectedText();
    }

    int c = m_cursor; // cursor position after insertion of commit string
    if (event->replacementStart() <= 0)
        c += event->commitString().length() - qMin(-event->replacementStart(), event->replacementLength());

    m_cursor += event->replacementStart();
    if (m_cursor < 0)
        m_cursor = 0;

    // insert commit string
    if (event->replacementLength()) {
        m_selstart = m_cursor;
        m_selend = m_selstart + event->replacementLength();
        removeSelectedText();
    }
    if (!event->commitString().isEmpty()) {
        internalInsert(event->commitString());
        cursorPositionChanged = true;
    }

    m_cursor = qBound(0, c, m_text.length());

    for (int i = 0; i < event->attributes().size(); ++i) {
        const QInputMethodEvent::Attribute &a = event->attributes().at(i);
        if (a.type == QInputMethodEvent::Selection) {
            m_cursor = qBound(0, a.start + a.length, m_text.length());
            if (a.length) {
                m_selstart = qMax(0, qMin(a.start, m_text.length()));
                m_selend = m_cursor;
                if (m_selend < m_selstart) {
                    qSwap(m_selstart, m_selend);
                }
                selectionChange = true;
            } else {
                m_selstart = m_selend = 0;
            }
            cursorPositionChanged = true;
        }
    }
#ifndef QT_NO_IM
    setPreeditArea(m_cursor, event->preeditString());
#endif //QT_NO_IM
    const int oldPreeditCursor = m_preeditCursor;
    m_preeditCursor = event->preeditString().length();
    m_hideCursor = false;
    QList<QTextLayout::FormatRange> formats;
    for (int i = 0; i < event->attributes().size(); ++i) {
        const QInputMethodEvent::Attribute &a = event->attributes().at(i);
        if (a.type == QInputMethodEvent::Cursor) {
            m_preeditCursor = a.start;
            m_hideCursor = !a.length;
        } else if (a.type == QInputMethodEvent::TextFormat) {
            QTextCharFormat f = qvariant_cast<QTextFormat>(a.value).toCharFormat();
            if (f.isValid()) {
                if (f.background().color().alphaF() == 1 && f.background().style() == Qt::SolidPattern) {
                    f.setForeground(f.background().color());
                    f.setBackground(Qt::transparent);
                    f.setUnderlineStyle(QTextCharFormat::SingleUnderline);
                    f.setFontUnderline(true);
                }
                QTextLayout::FormatRange o;
                o.start = a.start + m_cursor;
                o.length = a.length;
                o.format = f;
                formats.append(o);
            }
        }
    }
    m_textLayout.setAdditionalFormats(formats);
    updateDisplayText(/*force*/ true);
    if (originalSelectionStart != m_selstart || originalSelectionEnd != m_selend)
        emit selectionChanged();
    if (cursorPositionChanged)
        emitCursorPositionChanged();
    else if (m_preeditCursor != oldPreeditCursor)
        emit updateMicroFocus();
    if (isGettingInput)
        finishChange(priorState);
    if (selectionChange)
        emit selectionChanged();
}

void QLineControl::draw(QPainter *painter, const QPoint &offset, const QRect &clip, int flags)
{
    QVector<QTextLayout::FormatRange> selections;
    if (flags & DrawSelections) {
        QTextLayout::FormatRange o;
        if (m_selstart < m_selend) {
            o.start = m_selstart;
            o.length = m_selend - m_selstart;
            o.format.setBackground(m_palette.brush(QPalette::Highlight));
            o.format.setForeground(m_palette.brush(QPalette::HighlightedText));
        } else {
            // mask selection
            if(!m_blinkPeriod || m_blinkStatus){
                o.start = m_cursor;
                o.length = 1;
                o.format.setBackground(m_palette.brush(QPalette::Text));
                o.format.setForeground(m_palette.brush(QPalette::Window));
            }
        }
        selections.append(o);
    }

    if (flags & DrawText)
        m_textLayout.draw(painter, offset, selections, clip);

    if (flags & DrawCursor){
        int cursor = m_cursor;
        if (m_preeditCursor != -1)
            cursor += m_preeditCursor;
        if (!m_hideCursor && (!m_blinkPeriod || m_blinkStatus))
            m_textLayout.drawCursor(painter, offset, cursor, m_cursorWidth);
    }
}

void QLineControl::selectWordAtPos(int cursor)
{
    int next = cursor + 1;
    if(next > end())
        --next;
    int c = m_textLayout.previousCursorPosition(next, QTextLayout::SkipWords);
    moveCursor(c, false);
    // ## text layout should support end of words.
    int end = m_textLayout.nextCursorPosition(c, QTextLayout::SkipWords);
    while (end > cursor && m_text[end-1].isSpace())
        --end;
    moveCursor(end, true);
}

bool QLineControl::finishChange(int validateFromState, bool update, bool edited)
{
    Q_UNUSED(update)

    if (m_textDirty) {
        // do validation
        bool wasValidInput = m_validInput;
        m_validInput = true;
#ifndef QT_NO_VALIDATOR
        if (m_validator) {
            m_validInput = false;
            QString textCopy = m_text;
            int cursorCopy = m_cursor;
            m_validInput = (m_validator->validate(textCopy, cursorCopy) != QValidator::Invalid);
            if (m_validInput) {
                if (m_text != textCopy) {
                    internalSetText(textCopy, cursorCopy);
                    return true;
                }
                m_cursor = cursorCopy;
            }
        }
#endif
        if (validateFromState >= 0 && wasValidInput && !m_validInput) {
            if (m_transactions.count())
                return false;
            internalUndo(validateFromState);
            m_history.resize(m_undoState);
            if (m_modifiedState > m_undoState)
                m_modifiedState = -1;
            m_validInput = true;
            m_textDirty = false;
        }
        updateDisplayText();

        if (m_textDirty) {
            m_textDirty = false;
            QString actualText = text();
            if (edited)
                emit textEdited(actualText);
            emit textChanged(actualText);
        }
    }
    if (m_selDirty) {
        m_selDirty = false;
        emit selectionChanged();
    }
    if (m_cursor == m_lastCursorPos)
        updateMicroFocus();
    emitCursorPositionChanged();
    return true;
}

void QLineControl::internalSetText(const QString &txt, int pos, bool edited)
{
    cancelPasswordEchoTimer();
    internalDeselect();
    emit resetInputContext();
    QString oldText = m_text;
    if (m_maskData) {
        m_text = maskString(0, txt, true);
        m_text += clearString(m_text.length(), m_maxLength - m_text.length());
    } else {
        m_text = txt.isEmpty() ? txt : txt.left(m_maxLength);
    }
    m_history.clear();
    m_modifiedState =  m_undoState = 0;
    m_cursor = (pos < 0 || pos > m_text.length()) ? m_text.length() : pos;
    m_textDirty = (oldText != m_text);
    bool changed = finishChange(-1, true, edited);

#ifndef QT_NO_ACCESSIBILITY
    if (changed)
        QAccessible::updateAccessibility(parent(), 0, QAccessible::TextUpdated);
#else
    Q_UNUSED(changed);
#endif
}


void QLineControl::addCommand(const Command &cmd)
{
    if (m_separator && m_undoState && m_history[m_undoState - 1].type != Separator) {
        m_history.resize(m_undoState + 2);
        m_history[m_undoState++] = Command(Separator, m_cursor, 0, m_selstart, m_selend);
    } else {
        m_history.resize(m_undoState + 1);
    }
    m_separator = false;
    m_history[m_undoState++] = cmd;
}

void QLineControl::internalInsert(const QString &s)
{
#ifdef QT_GUI_PASSWORD_ECHO_DELAY
    if (m_echoMode == QLineEdit::Password) {
        if (m_passwordEchoTimer != 0)
            killTimer(m_passwordEchoTimer);
        m_passwordEchoTimer = startTimer(qt_passwordEchoDelay);
    }
#endif
    if (hasSelectedText())
        addCommand(Command(SetSelection, m_cursor, 0, m_selstart, m_selend));
    if (m_maskData) {
        QString ms = maskString(m_cursor, s);
        for (int i = 0; i < (int) ms.length(); ++i) {
            addCommand (Command(DeleteSelection, m_cursor + i, m_text.at(m_cursor + i), -1, -1));
            addCommand(Command(Insert, m_cursor + i, ms.at(i), -1, -1));
        }
        m_text.replace(m_cursor, ms.length(), ms);
        m_cursor += ms.length();
        m_cursor = nextMaskBlank(m_cursor);
        m_textDirty = true;
    } else {
        int remaining = m_maxLength - m_text.length();
        if (remaining != 0) {
            m_text.insert(m_cursor, s.left(remaining));
            for (int i = 0; i < (int) s.left(remaining).length(); ++i)
               addCommand(Command(Insert, m_cursor++, s.at(i), -1, -1));
            m_textDirty = true;
        }
    }
}

void QLineControl::internalDelete(bool wasBackspace)
{
    if (m_cursor < (int) m_text.length()) {
        cancelPasswordEchoTimer();
        if (hasSelectedText())
            addCommand(Command(SetSelection, m_cursor, 0, m_selstart, m_selend));
        addCommand(Command((CommandType)((m_maskData ? 2 : 0) + (wasBackspace ? Remove : Delete)),
                   m_cursor, m_text.at(m_cursor), -1, -1));
        if (m_maskData) {
            m_text.replace(m_cursor, 1, clearString(m_cursor, 1));
            addCommand(Command(Insert, m_cursor, m_text.at(m_cursor), -1, -1));
        } else {
            m_text.remove(m_cursor, 1);
        }
        m_textDirty = true;
    }
}

void QLineControl::removeSelectedText()
{
    if (m_selstart < m_selend && m_selend <= (int) m_text.length()) {
        cancelPasswordEchoTimer();
        separate();
        int i ;
        addCommand(Command(SetSelection, m_cursor, 0, m_selstart, m_selend));
        if (m_selstart <= m_cursor && m_cursor < m_selend) {
            // cursor is within the selection. Split up the commands
            // to be able to restore the correct cursor position
            for (i = m_cursor; i >= m_selstart; --i)
                addCommand (Command(DeleteSelection, i, m_text.at(i), -1, 1));
            for (i = m_selend - 1; i > m_cursor; --i)
                addCommand (Command(DeleteSelection, i - m_cursor + m_selstart - 1, m_text.at(i), -1, -1));
        } else {
            for (i = m_selend-1; i >= m_selstart; --i)
                addCommand (Command(RemoveSelection, i, m_text.at(i), -1, -1));
        }
        if (m_maskData) {
            m_text.replace(m_selstart, m_selend - m_selstart,  clearString(m_selstart, m_selend - m_selstart));
            for (int i = 0; i < m_selend - m_selstart; ++i)
                addCommand(Command(Insert, m_selstart + i, m_text.at(m_selstart + i), -1, -1));
        } else {
            m_text.remove(m_selstart, m_selend - m_selstart);
        }
        if (m_cursor > m_selstart)
            m_cursor -= qMin(m_cursor, m_selend) - m_selstart;
        internalDeselect();
        m_textDirty = true;
    }
}

void QLineControl::parseInputMask(const QString &maskFields)
{
    int delimiter = maskFields.indexOf(QLatin1Char(';'));
    if (maskFields.isEmpty() || delimiter == 0) {
        if (m_maskData) {
            delete [] m_maskData;
            m_maskData = 0;
            m_maxLength = 32767;
            internalSetText(QString());
        }
        return;
    }

    if (delimiter == -1) {
        m_blank = QLatin1Char(' ');
        m_inputMask = maskFields;
    } else {
        m_inputMask = maskFields.left(delimiter);
        m_blank = (delimiter + 1 < maskFields.length()) ? maskFields[delimiter + 1] : QLatin1Char(' ');
    }

    // calculate m_maxLength / m_maskData length
    m_maxLength = 0;
    QChar c = 0;
    for (int i=0; i<m_inputMask.length(); i++) {
        c = m_inputMask.at(i);
        if (i > 0 && m_inputMask.at(i-1) == QLatin1Char('\\')) {
            m_maxLength++;
            continue;
        }
        if (c != QLatin1Char('\\') && c != QLatin1Char('!') &&
             c != QLatin1Char('<') && c != QLatin1Char('>') &&
             c != QLatin1Char('{') && c != QLatin1Char('}') &&
             c != QLatin1Char('[') && c != QLatin1Char(']'))
            m_maxLength++;
    }

    delete [] m_maskData;
    m_maskData = new MaskInputData[m_maxLength];

    MaskInputData::Casemode m = MaskInputData::NoCaseMode;
    c = 0;
    bool s;
    bool escape = false;
    int index = 0;
    for (int i = 0; i < m_inputMask.length(); i++) {
        c = m_inputMask.at(i);
        if (escape) {
            s = true;
            m_maskData[index].maskChar = c;
            m_maskData[index].separator = s;
            m_maskData[index].caseMode = m;
            index++;
            escape = false;
        } else if (c == QLatin1Char('<')) {
                m = MaskInputData::Lower;
        } else if (c == QLatin1Char('>')) {
            m = MaskInputData::Upper;
        } else if (c == QLatin1Char('!')) {
            m = MaskInputData::NoCaseMode;
        } else if (c != QLatin1Char('{') && c != QLatin1Char('}') && c != QLatin1Char('[') && c != QLatin1Char(']')) {
            switch (c.unicode()) {
            case 'A':
            case 'a':
            case 'N':
            case 'n':
            case 'X':
            case 'x':
            case '9':
            case '0':
            case 'D':
            case 'd':
            case '#':
            case 'H':
            case 'h':
            case 'B':
            case 'b':
                s = false;
                break;
            case '\\':
                escape = true;
            default:
                s = true;
                break;
            }

            if (!escape) {
                m_maskData[index].maskChar = c;
                m_maskData[index].separator = s;
                m_maskData[index].caseMode = m;
                index++;
            }
        }
    }
    internalSetText(m_text);
}


bool QLineControl::isValidInput(QChar key, QChar mask) const
{
    switch (mask.unicode()) {
    case 'A':
        if (key.isLetter())
            return true;
        break;
    case 'a':
        if (key.isLetter() || key == m_blank)
            return true;
        break;
    case 'N':
        if (key.isLetterOrNumber())
            return true;
        break;
    case 'n':
        if (key.isLetterOrNumber() || key == m_blank)
            return true;
        break;
    case 'X':
        if (key.isPrint())
            return true;
        break;
    case 'x':
        if (key.isPrint() || key == m_blank)
            return true;
        break;
    case '9':
        if (key.isNumber())
            return true;
        break;
    case '0':
        if (key.isNumber() || key == m_blank)
            return true;
        break;
    case 'D':
        if (key.isNumber() && key.digitValue() > 0)
            return true;
        break;
    case 'd':
        if ((key.isNumber() && key.digitValue() > 0) || key == m_blank)
            return true;
        break;
    case '#':
        if (key.isNumber() || key == QLatin1Char('+') || key == QLatin1Char('-') || key == m_blank)
            return true;
        break;
    case 'B':
        if (key == QLatin1Char('0') || key == QLatin1Char('1'))
            return true;
        break;
    case 'b':
        if (key == QLatin1Char('0') || key == QLatin1Char('1') || key == m_blank)
            return true;
        break;
    case 'H':
        if (key.isNumber() || (key >= QLatin1Char('a') && key <= QLatin1Char('f')) || (key >= QLatin1Char('A') && key <= QLatin1Char('F')))
            return true;
        break;
    case 'h':
        if (key.isNumber() || (key >= QLatin1Char('a') && key <= QLatin1Char('f')) || (key >= QLatin1Char('A') && key <= QLatin1Char('F')) || key == m_blank)
            return true;
        break;
    default:
        break;
    }
    return false;
}

bool QLineControl::hasAcceptableInput(const QString &str) const
{
#ifndef QT_NO_VALIDATOR
    QString textCopy = str;
    int cursorCopy = m_cursor;
    if (m_validator && m_validator->validate(textCopy, cursorCopy)
        != QValidator::Acceptable)
        return false;
#endif

    if (!m_maskData)
        return true;

    if (str.length() != m_maxLength)
        return false;

    for (int i=0; i < m_maxLength; ++i) {
        if (m_maskData[i].separator) {
            if (str.at(i) != m_maskData[i].maskChar)
                return false;
        } else {
            if (!isValidInput(str.at(i), m_maskData[i].maskChar))
                return false;
        }
    }
    return true;
}

QString QLineControl::maskString(uint pos, const QString &str, bool clear) const
{
    if (pos >= (uint)m_maxLength)
        return QString::fromLatin1("");

    QString fill;
    fill = clear ? clearString(0, m_maxLength) : m_text;

    int strIndex = 0;
    QString s = QString::fromLatin1("");
    int i = pos;
    while (i < m_maxLength) {
        if (strIndex < str.length()) {
            if (m_maskData[i].separator) {
                s += m_maskData[i].maskChar;
                if (str[(int)strIndex] == m_maskData[i].maskChar)
                    strIndex++;
                ++i;
            } else {
                if (isValidInput(str[(int)strIndex], m_maskData[i].maskChar)) {
                    switch (m_maskData[i].caseMode) {
                    case MaskInputData::Upper:
                        s += str[(int)strIndex].toUpper();
                        break;
                    case MaskInputData::Lower:
                        s += str[(int)strIndex].toLower();
                        break;
                    default:
                        s += str[(int)strIndex];
                    }
                    ++i;
                } else {
                    // search for separator first
                    int n = findInMask(i, true, true, str[(int)strIndex]);
                    if (n != -1) {
                        if (str.length() != 1 || i == 0 || (i > 0 && (!m_maskData[i-1].separator || m_maskData[i-1].maskChar != str[(int)strIndex]))) {
                            s += fill.mid(i, n-i+1);
                            i = n + 1; // update i to find + 1
                        }
                    } else {
                        // search for valid m_blank if not
                        n = findInMask(i, true, false, str[(int)strIndex]);
                        if (n != -1) {
                            s += fill.mid(i, n-i);
                            switch (m_maskData[n].caseMode) {
                            case MaskInputData::Upper:
                                s += str[(int)strIndex].toUpper();
                                break;
                            case MaskInputData::Lower:
                                s += str[(int)strIndex].toLower();
                                break;
                            default:
                                s += str[(int)strIndex];
                            }
                            i = n + 1; // updates i to find + 1
                        }
                    }
                }
                ++strIndex;
            }
        } else
            break;
    }

    return s;
}



QString QLineControl::clearString(uint pos, uint len) const
{
    if (pos >= (uint)m_maxLength)
        return QString();

    QString s;
    int end = qMin((uint)m_maxLength, pos + len);
    for (int i = pos; i < end; ++i)
        if (m_maskData[i].separator)
            s += m_maskData[i].maskChar;
        else
            s += m_blank;

    return s;
}

QString QLineControl::stripString(const QString &str) const
{
    if (!m_maskData)
        return str;

    QString s;
    int end = qMin(m_maxLength, (int)str.length());
    for (int i = 0; i < end; ++i)
        if (m_maskData[i].separator)
            s += m_maskData[i].maskChar;
        else
            if (str[i] != m_blank)
                s += str[i];

    return s;
}

int QLineControl::findInMask(int pos, bool forward, bool findSeparator, QChar searchChar) const
{
    if (pos >= m_maxLength || pos < 0)
        return -1;

    int end = forward ? m_maxLength : -1;
    int step = forward ? 1 : -1;
    int i = pos;

    while (i != end) {
        if (findSeparator) {
            if (m_maskData[i].separator && m_maskData[i].maskChar == searchChar)
                return i;
        } else {
            if (!m_maskData[i].separator) {
                if (searchChar.isNull())
                    return i;
                else if (isValidInput(searchChar, m_maskData[i].maskChar))
                    return i;
            }
        }
        i += step;
    }
    return -1;
}

void QLineControl::internalUndo(int until)
{
    if (!isUndoAvailable())
        return;
    cancelPasswordEchoTimer();
    internalDeselect();

    // Undo works only for clearing the line when in any of password the modes
    if (m_echoMode != QLineEdit::Normal) {
        clear();
        return;
    }

    while (m_undoState && m_undoState > until) {
        Command& cmd = m_history[--m_undoState];
        switch (cmd.type) {
        case Insert:
            m_text.remove(cmd.pos, 1);
            m_cursor = cmd.pos;
            break;
        case SetSelection:
            m_selstart = cmd.selStart;
            m_selend = cmd.selEnd;
            m_cursor = cmd.pos;
            break;
        case Remove:
        case RemoveSelection:
            m_text.insert(cmd.pos, cmd.uc);
            m_cursor = cmd.pos + 1;
            break;
        case Delete:
        case DeleteSelection:
            m_text.insert(cmd.pos, cmd.uc);
            m_cursor = cmd.pos;
            break;
        case Separator:
            continue;
        }
        if (until < 0 && m_undoState) {
            Command& next = m_history[m_undoState-1];
            if (next.type != cmd.type && next.type < RemoveSelection
                 && (cmd.type < RemoveSelection || next.type == Separator))
                break;
        }
    }
    m_textDirty = true;
    emitCursorPositionChanged();
}

void QLineControl::internalRedo()
{
    if (!isRedoAvailable())
        return;
    internalDeselect();
    while (m_undoState < (int)m_history.size()) {
        Command& cmd = m_history[m_undoState++];
        switch (cmd.type) {
        case Insert:
            m_text.insert(cmd.pos, cmd.uc);
            m_cursor = cmd.pos + 1;
            break;
        case SetSelection:
            m_selstart = cmd.selStart;
            m_selend = cmd.selEnd;
            m_cursor = cmd.pos;
            break;
        case Remove:
        case Delete:
        case RemoveSelection:
        case DeleteSelection:
            m_text.remove(cmd.pos, 1);
            m_selstart = cmd.selStart;
            m_selend = cmd.selEnd;
            m_cursor = cmd.pos;
            break;
        case Separator:
            m_selstart = cmd.selStart;
            m_selend = cmd.selEnd;
            m_cursor = cmd.pos;
            break;
        }
        if (m_undoState < (int)m_history.size()) {
            Command& next = m_history[m_undoState];
            if (next.type != cmd.type && cmd.type < RemoveSelection && next.type != Separator
                 && (next.type < RemoveSelection || cmd.type == Separator))
                break;
        }
    }
    m_textDirty = true;
    emitCursorPositionChanged();
}

void QLineControl::emitCursorPositionChanged()
{
    if (m_cursor != m_lastCursorPos) {
        const int oldLast = m_lastCursorPos;
        m_lastCursorPos = m_cursor;
        cursorPositionChanged(oldLast, m_cursor);
#ifndef QT_NO_ACCESSIBILITY
        QAccessible::updateAccessibility(parent(), 0, QAccessible::TextCaretMoved);
#endif
    }
}

#ifndef QT_NO_COMPLETER
// iterating forward(dir=1)/backward(dir=-1) from the
// current row based. dir=0 indicates a new completion prefix was set.
bool QLineControl::advanceToEnabledItem(int dir)
{
    int start = m_completer->currentRow();
    if (start == -1)
        return false;
    int i = start + dir;
    if (dir == 0) dir = 1;
    do {
        if (!m_completer->setCurrentRow(i)) {
            if (!m_completer->wrapAround())
                break;
            i = i > 0 ? 0 : m_completer->completionCount() - 1;
        } else {
            QModelIndex currentIndex = m_completer->currentIndex();
            if (m_completer->completionModel()->flags(currentIndex) & Qt::ItemIsEnabled)
                return true;
            i += dir;
        }
    } while (i != start);

    m_completer->setCurrentRow(start); // restore
    return false;
}

void QLineControl::complete(int key)
{
    if (!m_completer || isReadOnly() || echoMode() != QLineEdit::Normal)
        return;

    QString text = this->text();
    if (m_completer->completionMode() == QCompleter::InlineCompletion) {
        if (key == Qt::Key_Backspace)
            return;
        int n = 0;
        if (key == Qt::Key_Up || key == Qt::Key_Down) {
            if (textAfterSelection().length())
                return;
            QString prefix = hasSelectedText() ? textBeforeSelection()
                : text;
            if (text.compare(m_completer->currentCompletion(), m_completer->caseSensitivity()) != 0
                || prefix.compare(m_completer->completionPrefix(), m_completer->caseSensitivity()) != 0) {
                m_completer->setCompletionPrefix(prefix);
            } else {
                n = (key == Qt::Key_Up) ? -1 : +1;
            }
        } else {
            m_completer->setCompletionPrefix(text);
        }
        if (!advanceToEnabledItem(n))
            return;
    } else {
#ifndef QT_KEYPAD_NAVIGATION
        if (text.isEmpty()) {
            m_completer->popup()->hide();
            return;
        }
#endif
        m_completer->setCompletionPrefix(text);
    }

    m_completer->complete();
}
#endif

void QLineControl::setCursorBlinkPeriod(int msec)
{
    if (msec == m_blinkPeriod)
        return;
    if (m_blinkTimer) {
        killTimer(m_blinkTimer);
    }
    if (msec) {
        m_blinkTimer = startTimer(msec / 2);
        m_blinkStatus = 1;
    } else {
        m_blinkTimer = 0;
        if (m_blinkStatus == 1)
            emit updateNeeded(inputMask().isEmpty() ? cursorRect() : QRect());
    }
    m_blinkPeriod = msec;
}

void QLineControl::resetCursorBlinkTimer()
{
    if (m_blinkPeriod == 0 || m_blinkTimer == 0)
        return;
    killTimer(m_blinkTimer);
    m_blinkTimer = startTimer(m_blinkPeriod / 2);
    m_blinkStatus = 1;
}

void QLineControl::timerEvent(QTimerEvent *event)
{
    if (event->timerId() == m_blinkTimer) {
        m_blinkStatus = !m_blinkStatus;
        emit updateNeeded(inputMask().isEmpty() ? cursorRect() : QRect());
    } else if (event->timerId() == m_deleteAllTimer) {
        killTimer(m_deleteAllTimer);
        m_deleteAllTimer = 0;
        clear();
    } else if (event->timerId() == m_tripleClickTimer) {
        killTimer(m_tripleClickTimer);
        m_tripleClickTimer = 0;
#ifdef QT_GUI_PASSWORD_ECHO_DELAY
    } else if (event->timerId() == m_passwordEchoTimer) {
        killTimer(m_passwordEchoTimer);
        m_passwordEchoTimer = 0;
        updateDisplayText();
#endif
    }
}

bool QLineControl::processEvent(QEvent* ev)
{
#ifdef QT_KEYPAD_NAVIGATION
    if (QApplication::keypadNavigationEnabled()) {
        if ((ev->type() == QEvent::KeyPress) || (ev->type() == QEvent::KeyRelease)) {
            QKeyEvent *ke = (QKeyEvent *)ev;
            if (ke->key() == Qt::Key_Back) {
                if (ke->isAutoRepeat()) {
                    // Swallow it. We don't want back keys running amok.
                    ke->accept();
                    return true;
                }
                if ((ev->type() == QEvent::KeyRelease)
                    && !isReadOnly()
                    && m_deleteAllTimer) {
                    killTimer(m_deleteAllTimer);
                    m_deleteAllTimer = 0;
                    backspace();
                    ke->accept();
                    return true;
                }
            }
        }
    }
#endif
    switch(ev->type()){
#ifndef QT_NO_GRAPHICSVIEW
        case QEvent::GraphicsSceneMouseDoubleClick:
        case QEvent::GraphicsSceneMouseMove:
        case QEvent::GraphicsSceneMouseRelease:
        case QEvent::GraphicsSceneMousePress:{
               QGraphicsSceneMouseEvent *gvEv = static_cast<QGraphicsSceneMouseEvent*>(ev);
               QMouseEvent mouse(ev->type(),
                    gvEv->pos().toPoint(), gvEv->button(), gvEv->buttons(), gvEv->modifiers());
               processMouseEvent(&mouse); break;
        }
#endif
        case QEvent::MouseButtonPress:
        case QEvent::MouseButtonRelease:
        case QEvent::MouseButtonDblClick:
        case QEvent::MouseMove:
            processMouseEvent(static_cast<QMouseEvent*>(ev)); break;
        case QEvent::KeyPress:
        case QEvent::KeyRelease:
            processKeyEvent(static_cast<QKeyEvent*>(ev)); break;
        case QEvent::InputMethod:
            processInputMethodEvent(static_cast<QInputMethodEvent*>(ev)); break;
#ifndef QT_NO_SHORTCUT
        case QEvent::ShortcutOverride:{
            if (isReadOnly())
                return false;
            QKeyEvent* ke = static_cast<QKeyEvent*>(ev);
            if (ke == QKeySequence::Copy
                || ke == QKeySequence::Paste
                || ke == QKeySequence::Cut
                || ke == QKeySequence::Redo
                || ke == QKeySequence::Undo
                || ke == QKeySequence::MoveToNextWord
                || ke == QKeySequence::MoveToPreviousWord
                || ke == QKeySequence::MoveToStartOfDocument
                || ke == QKeySequence::MoveToEndOfDocument
                || ke == QKeySequence::SelectNextWord
                || ke == QKeySequence::SelectPreviousWord
                || ke == QKeySequence::SelectStartOfLine
                || ke == QKeySequence::SelectEndOfLine
                || ke == QKeySequence::SelectStartOfBlock
                || ke == QKeySequence::SelectEndOfBlock
                || ke == QKeySequence::SelectStartOfDocument
                || ke == QKeySequence::SelectAll
                || ke == QKeySequence::SelectEndOfDocument) {
                ke->accept();
            } else if (ke->modifiers() == Qt::NoModifier || ke->modifiers() == Qt::ShiftModifier
                       || ke->modifiers() == Qt::KeypadModifier) {
                if (ke->key() < Qt::Key_Escape) {
                    ke->accept();
                } else {
                    switch (ke->key()) {
                    case Qt::Key_Delete:
                    case Qt::Key_Home:
                    case Qt::Key_End:
                    case Qt::Key_Backspace:
                    case Qt::Key_Left:
                    case Qt::Key_Right:
                        ke->accept();
                    default:
                        break;
                    }
                }
            }
        }
#endif
        default:
            return false;
    }
    return true;
}

void QLineControl::processMouseEvent(QMouseEvent* ev)
{

    switch (ev->type()) {
        case QEvent::GraphicsSceneMousePress:
        case QEvent::MouseButtonPress:{
            if (m_tripleClickTimer
                && (ev->pos() - m_tripleClick).manhattanLength()
                    < QApplication::startDragDistance()) {
                selectAll();
                return;
            }
            if (ev->button() == Qt::RightButton)
                return;

            bool mark = ev->modifiers() & Qt::ShiftModifier;
            int cursor = xToPos(ev->pos().x());
            moveCursor(cursor, mark);
            break;
        }
        case QEvent::GraphicsSceneMouseDoubleClick:
        case QEvent::MouseButtonDblClick:
            if (ev->button() == Qt::LeftButton) {
                selectWordAtPos(xToPos(ev->pos().x()));
                if (m_tripleClickTimer)
                    killTimer(m_tripleClickTimer);
                m_tripleClickTimer = startTimer(QApplication::doubleClickInterval());
                m_tripleClick = ev->pos();
            }
            break;
        case QEvent::GraphicsSceneMouseRelease:
        case QEvent::MouseButtonRelease:
#ifndef QT_NO_CLIPBOARD
            if (QApplication::clipboard()->supportsSelection()) {
                if (ev->button() == Qt::LeftButton) {
                    copy(QClipboard::Selection);
                } else if (!isReadOnly() && ev->button() == Qt::MidButton) {
                    deselect();
                    insert(QApplication::clipboard()->text(QClipboard::Selection));
                }
            }
#endif
            break;
        case QEvent::GraphicsSceneMouseMove:
        case QEvent::MouseMove:
            if (ev->buttons() & Qt::LeftButton) {
                moveCursor(xToPos(ev->pos().x()), true);
            }
            break;
        default:
            break;
    }
}

void QLineControl::processKeyEvent(QKeyEvent* event)
{
    bool inlineCompletionAccepted = false;

#ifndef QT_NO_COMPLETER
    if (m_completer) {
        QCompleter::CompletionMode completionMode = m_completer->completionMode();
        if ((completionMode == QCompleter::PopupCompletion
             || completionMode == QCompleter::UnfilteredPopupCompletion)
            && m_completer->popup()
            && m_completer->popup()->isVisible()) {
            // The following keys are forwarded by the completer to the widget
            // Ignoring the events lets the completer provide suitable default behavior
            switch (event->key()) {
            case Qt::Key_Escape:
                event->ignore();
                return;
            case Qt::Key_Enter:
            case Qt::Key_Return:
            case Qt::Key_F4:
#ifdef QT_KEYPAD_NAVIGATION
            case Qt::Key_Select:
                if (!QApplication::keypadNavigationEnabled())
                    break;
#endif
                m_completer->popup()->hide(); // just hide. will end up propagating to parent
            default:
                break; // normal key processing
            }
        } else if (completionMode == QCompleter::InlineCompletion) {
            switch (event->key()) {
            case Qt::Key_Enter:
            case Qt::Key_Return:
            case Qt::Key_F4:
#ifdef QT_KEYPAD_NAVIGATION
            case Qt::Key_Select:
                if (!QApplication::keypadNavigationEnabled())
                    break;
#endif
                if (!m_completer->currentCompletion().isEmpty() && hasSelectedText()
                    && textAfterSelection().isEmpty()) {
                    setText(m_completer->currentCompletion());
                    inlineCompletionAccepted = true;
                }
            default:
                break; // normal key processing
            }
        }
    }
#endif // QT_NO_COMPLETER

    if (event->key() == Qt::Key_Enter || event->key() == Qt::Key_Return) {
        if (hasAcceptableInput() || fixup()) {
            emit accepted();
            emit editingFinished();
        }
        if (inlineCompletionAccepted)
            event->accept();
        else
            event->ignore();
        return;
    }

    if (echoMode() == QLineEdit::PasswordEchoOnEdit
        && !passwordEchoEditing()
        && !isReadOnly()
        && !event->text().isEmpty()
#ifdef QT_KEYPAD_NAVIGATION
        && event->key() != Qt::Key_Select
        && event->key() != Qt::Key_Up
        && event->key() != Qt::Key_Down
        && event->key() != Qt::Key_Back
#endif
        && !(event->modifiers() & Qt::ControlModifier)) {
        // Clear the edit and reset to normal echo mode while editing; the
        // echo mode switches back when the edit loses focus
        // ### resets current content.  dubious code; you can
        // navigate with keys up, down, back, and select(?), but if you press
        // "left" or "right" it clears?
        updatePasswordEchoEditing(true);
        clear();
    }

    bool unknown = false;
    bool visual = cursorMoveStyle() == Qt::VisualMoveStyle;

    if (false) {
    }
#ifndef QT_NO_SHORTCUT
    else if (event == QKeySequence::Undo) {
        if (!isReadOnly())
            undo();
    }
    else if (event == QKeySequence::Redo) {
        if (!isReadOnly())
            redo();
    }
    else if (event == QKeySequence::SelectAll) {
        selectAll();
    }
#ifndef QT_NO_CLIPBOARD
    else if (event == QKeySequence::Copy) {
        copy();
    }
    else if (event == QKeySequence::Paste) {
        if (!isReadOnly()) {
            QClipboard::Mode mode = QClipboard::Clipboard;
#ifdef Q_WS_X11
            if (event->modifiers() == (Qt::CTRL | Qt::SHIFT) && event->key() == Qt::Key_Insert)
                mode = QClipboard::Selection;
#endif
            paste(mode);
        }
    }
    else if (event == QKeySequence::Cut) {
        if (!isReadOnly()) {
            copy();
            del();
        }
    }
    else if (event == QKeySequence::DeleteEndOfLine) {
        if (!isReadOnly()) {
            setSelection(cursor(), end());
            copy();
            del();
        }
    }
#endif //QT_NO_CLIPBOARD
    else if (event == QKeySequence::MoveToStartOfLine || event == QKeySequence::MoveToStartOfBlock) {
        home(0);
    }
    else if (event == QKeySequence::MoveToEndOfLine || event == QKeySequence::MoveToEndOfBlock) {
        end(0);
    }
    else if (event == QKeySequence::SelectStartOfLine || event == QKeySequence::SelectStartOfBlock) {
        home(1);
    }
    else if (event == QKeySequence::SelectEndOfLine || event == QKeySequence::SelectEndOfBlock) {
        end(1);
    }
    else if (event == QKeySequence::MoveToNextChar) {
#if !defined(Q_WS_WIN) || defined(QT_NO_COMPLETER)
        if (hasSelectedText()) {
#else
        if (hasSelectedText() && m_completer
            && m_completer->completionMode() == QCompleter::InlineCompletion) {
#endif
            moveCursor(selectionEnd(), false);
        } else {
            cursorForward(0, visual ? 1 : (layoutDirection() == Qt::LeftToRight ? 1 : -1));
        }
    }
    else if (event == QKeySequence::SelectNextChar) {
        cursorForward(1, visual ? 1 : (layoutDirection() == Qt::LeftToRight ? 1 : -1));
    }
    else if (event == QKeySequence::MoveToPreviousChar) {
#if !defined(Q_WS_WIN) || defined(QT_NO_COMPLETER)
        if (hasSelectedText()) {
#else
        if (hasSelectedText() && m_completer
            && m_completer->completionMode() == QCompleter::InlineCompletion) {
#endif
            moveCursor(selectionStart(), false);
        } else {
            cursorForward(0, visual ? -1 : (layoutDirection() == Qt::LeftToRight ? -1 : 1));
        }
    }
    else if (event == QKeySequence::SelectPreviousChar) {
        cursorForward(1, visual ? -1 : (layoutDirection() == Qt::LeftToRight ? -1 : 1));
    }
    else if (event == QKeySequence::MoveToNextWord) {
        if (echoMode() == QLineEdit::Normal)
            layoutDirection() == Qt::LeftToRight ? cursorWordForward(0) : cursorWordBackward(0);
        else
            layoutDirection() == Qt::LeftToRight ? end(0) : home(0);
    }
    else if (event == QKeySequence::MoveToPreviousWord) {
        if (echoMode() == QLineEdit::Normal)
            layoutDirection() == Qt::LeftToRight ? cursorWordBackward(0) : cursorWordForward(0);
        else if (!isReadOnly()) {
            layoutDirection() == Qt::LeftToRight ? home(0) : end(0);
        }
    }
    else if (event == QKeySequence::SelectNextWord) {
        if (echoMode() == QLineEdit::Normal)
            layoutDirection() == Qt::LeftToRight ? cursorWordForward(1) : cursorWordBackward(1);
        else
            layoutDirection() == Qt::LeftToRight ? end(1) : home(1);
    }
    else if (event == QKeySequence::SelectPreviousWord) {
        if (echoMode() == QLineEdit::Normal)
            layoutDirection() == Qt::LeftToRight ? cursorWordBackward(1) : cursorWordForward(1);
        else
            layoutDirection() == Qt::LeftToRight ? home(1) : end(1);
    }
    else if (event == QKeySequence::Delete) {
        if (!isReadOnly())
            del();
    }
    else if (event == QKeySequence::DeleteEndOfWord) {
        if (!isReadOnly()) {
            cursorWordForward(true);
            del();
        }
    }
    else if (event == QKeySequence::DeleteStartOfWord) {
        if (!isReadOnly()) {
            cursorWordBackward(true);
            del();
        }
    }
#endif // QT_NO_SHORTCUT
    else {
        bool handled = false;
#ifdef Q_WS_MAC
        if (event->key() == Qt::Key_Up || event->key() == Qt::Key_Down) {
            Qt::KeyboardModifiers myModifiers = (event->modifiers() & ~Qt::KeypadModifier);
            if (myModifiers & Qt::ShiftModifier) {
                if (myModifiers == (Qt::ControlModifier|Qt::ShiftModifier)
                        || myModifiers == (Qt::AltModifier|Qt::ShiftModifier)
                        || myModifiers == Qt::ShiftModifier) {

                    event->key() == Qt::Key_Up ? home(1) : end(1);
                }
            } else {
                if ((myModifiers == Qt::ControlModifier
                     || myModifiers == Qt::AltModifier
                     || myModifiers == Qt::NoModifier)) {
                    event->key() == Qt::Key_Up ? home(0) : end(0);
                }
            }
            handled = true;
        }
#endif
        if (event->modifiers() & Qt::ControlModifier) {
            switch (event->key()) {
            case Qt::Key_Backspace:
                if (!isReadOnly()) {
                    cursorWordBackward(true);
                    del();
                }
                break;
#ifndef QT_NO_COMPLETER
            case Qt::Key_Up:
            case Qt::Key_Down:
                complete(event->key());
                break;
#endif
#if defined(Q_WS_X11)
            case Qt::Key_E:
                end(0);
                break;

            case Qt::Key_U:
                if (!isReadOnly()) {
                    setSelection(0, text().size());
#ifndef QT_NO_CLIPBOARD
                    copy();
#endif
                    del();
                }
            break;
#endif
            default:
                if (!handled)
                    unknown = true;
            }
        } else { // ### check for *no* modifier
            switch (event->key()) {
            case Qt::Key_Backspace:
                if (!isReadOnly()) {
                    backspace();
#ifndef QT_NO_COMPLETER
                    complete(Qt::Key_Backspace);
#endif
                }
                break;
#ifdef QT_KEYPAD_NAVIGATION
            case Qt::Key_Back:
                if (QApplication::keypadNavigationEnabled() && !event->isAutoRepeat()
                    && !isReadOnly()) {
                    if (text().length() == 0) {
                        setText(m_cancelText);

                        if (passwordEchoEditing())
                            updatePasswordEchoEditing(false);

                        emit editFocusChange(false);
                    } else if (!m_deleteAllTimer) {
                        m_deleteAllTimer = startTimer(750);
                    }
                } else {
                    unknown = true;
                }
                break;
#endif
            default:
                if (!handled)
                    unknown = true;
            }
        }
    }

    if (event->key() == Qt::Key_Direction_L || event->key() == Qt::Key_Direction_R) {
        setLayoutDirection((event->key() == Qt::Key_Direction_L) ? Qt::LeftToRight : Qt::RightToLeft);
        unknown = false;
    }

    if (unknown && !isReadOnly()) {
        QString t = event->text();
        if (!t.isEmpty() && t.at(0).isPrint()) {
            insert(t);
#ifndef QT_NO_COMPLETER
            complete(event->key());
#endif
            event->accept();
            return;
        }
    }

    if (unknown)
        event->ignore();
    else
        event->accept();
}

bool QLineControl::isUndoAvailable() const
{
    // For security reasons undo is not available in any password mode (NoEcho included)
    // with the exception that the user can clear the password with undo.
    return !m_readOnly && m_undoState
            && (m_echoMode == QLineEdit::Normal || m_history[m_undoState - 1].type == QLineControl::Insert);
}

bool QLineControl::isRedoAvailable() const
{
    // Same as with undo. Disabled for password modes.
    return !m_readOnly
            && m_echoMode == QLineEdit::Normal
            && m_undoState < m_history.size();
}

QT_END_NAMESPACE

#endif