src/gui/widgets/qlineedit.cpp

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/****************************************************************************
**
** Copyright (C) 1992-2006 Trolltech ASA. All rights reserved.
**
** This file is part of the QtGui module of the Qt Toolkit.
**
** This file may be used under the terms of the GNU General Public
** License version 2.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of
** this file.  Please review the following information to ensure GNU
** General Public Licensing requirements will be met:
** http://www.trolltech.com/products/qt/opensource.html
**
** If you are unsure which license is appropriate for your use, please
** review the following information:
** http://www.trolltech.com/products/qt/licensing.html or contact the
** sales department at sales@trolltech.com.
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
****************************************************************************/

/*
    Changes since 4.1:

    Platform specific (read emacs) shortcuts have been removed from the documentation.

    Ctrl+A on X11 now means "Select all" like on other platforms, not home.

    Ctrl+D wil no longer work on Windows (but on X11/mac)

    Ctrl+B, Ctr+E, Ctrl+H, Ctrl+F are completely removed from line edit. If they are popular, we can add them
    as standardshortcuts on X11 so that they work in other widgets as well.
*/

#include "qlineedit.h"
#include "qlineedit_p.h"

#ifndef QT_NO_LINEEDIT
#include "qaction.h"
#include "qapplication.h"
#include "qclipboard.h"
#include "qdrag.h"
#include "qdrawutil.h"
#include "qevent.h"
#include "qfontmetrics.h"
#include "qmenu.h"
#include "qpainter.h"
#include "qpixmap.h"
#include "qpointer.h"
#include "qstringlist.h"
#include "qstyle.h"
#include "qstyleoption.h"
#include "qtimer.h"
#include "qvalidator.h"
#include "qvariant.h"
#include "qvector.h"
#include "qwhatsthis.h"
#include "qdebug.h"
#include "qtextedit.h"
#include <private/qtextedit_p.h>
#ifndef QT_NO_ACCESSIBILITY
#include "qaccessible.h"
#endif
#ifndef QT_NO_IM
#include "qinputcontext.h"
#include "qlist.h"
#endif
#include "qabstractitemview.h"

#ifndef QT_NO_SHORTCUT
#include "qkeysequence.h"
#define ACCEL_KEY(k) QLatin1String("\t") + QString(QKeySequence(Qt::CTRL | Qt::Key_ ## k))
#else
#define ACCEL_KEY(k) QLatin1String("\t") + QString("Ctrl+" #k)
#endif

#ifdef Q_WS_MAC
extern void qt_mac_secure_keyboard(bool); //qapplication_mac.cpp
#endif

#include <limits.h>

#define verticalMargin 1
#define horizontalMargin 2

QStyleOptionFrame QLineEditPrivate::getStyleOption() const
{
    Q_Q(const QLineEdit);
    QStyleOptionFrame opt;
    opt.init(q);
    opt.rect = q->contentsRect();
    opt.lineWidth = frame ? q->style()->pixelMetric(QStyle::PM_DefaultFrameWidth) : 0;
    opt.midLineWidth = 0;
    opt.state |= QStyle::State_Sunken;
    if (readOnly)
        opt.state |= QStyle::State_ReadOnly;
#ifdef QT_KEYPAD_NAVIGATION
    if (q->hasEditFocus())
        opt.state |= QStyle::State_HasEditFocus;
#endif
    return opt;
}

QLineEdit::QLineEdit(QWidget* parent)
    : QWidget(*new QLineEditPrivate, parent,0)
{
    Q_D(QLineEdit);
    d->init(QString());
}

QLineEdit::QLineEdit(const QString& contents, QWidget* parent)
    : QWidget(*new QLineEditPrivate, parent, 0)
{
    Q_D(QLineEdit);
    d->init(contents);
}


#ifdef QT3_SUPPORT

QLineEdit::QLineEdit(QWidget* parent, const char* name)
    : QWidget(*new QLineEditPrivate, parent,0)
{
    Q_D(QLineEdit);
    setObjectName(QString::fromAscii(name));
    d->init(QString());
}

QLineEdit::QLineEdit(const QString& contents, QWidget* parent, const char* name)
    : QWidget(*new QLineEditPrivate, parent, 0)
{
    Q_D(QLineEdit);
    setObjectName(QString::fromAscii(name));
    d->init(contents);
}

QLineEdit::QLineEdit(const QString& contents, const QString &inputMask, QWidget* parent, const char* name)
    : QWidget(*new QLineEditPrivate, parent, 0)
{
    Q_D(QLineEdit);
    setObjectName(QString::fromAscii(name));
    d->parseInputMask(inputMask);
    if (d->maskData) {
        QString ms = d->maskString(0, contents);
        d->init(ms + d->clearString(ms.length(), d->maxLength - ms.length()));
        d->cursor = d->nextMaskBlank(ms.length());
    } else {
        d->init(contents);
    }
}
#endif

QLineEdit::~QLineEdit()
{
}


QString QLineEdit::text() const
{
    Q_D(const QLineEdit);
    QString res = d->text;
    if (d->maskData)
        res = d->stripString(d->text);
    return (res.isNull() ? QString::fromLatin1("") : res);
}

void QLineEdit::setText(const QString& text)
{
    Q_D(QLineEdit);
    d->setText(text, -1, false);
#ifdef QT_KEYPAD_NAVIGATION
    d->origText = d->text;
#endif
}


QString QLineEdit::displayText() const
{
    Q_D(const QLineEdit);
    if (d->echoMode == NoEcho)
        return QString::fromLatin1("");
    QString res = d->text;

    if (d->echoMode == Password || d->echoMode == PasswordEchoOnEdit) {
        QStyleOptionFrame opt = d->getStyleOption();
        res.fill(style()->styleHint(QStyle::SH_LineEdit_PasswordCharacter, &opt, this));
    }
    return (res.isNull() ? QString::fromLatin1("") : res);
}


int QLineEdit::maxLength() const
{
    Q_D(const QLineEdit);
    return d->maxLength;
}

void QLineEdit::setMaxLength(int maxLength)
{
    Q_D(QLineEdit);
    if (d->maskData)
        return;
    d->maxLength = maxLength;
    setText(d->text);
}



bool QLineEdit::hasFrame() const
{
    Q_D(const QLineEdit);
    return d->frame;
}


void QLineEdit::setFrame(bool enable)
{
    Q_D(QLineEdit);
    d->frame = enable;
    update();
    updateGeometry();
}


QLineEdit::EchoMode QLineEdit::echoMode() const
{
    Q_D(const QLineEdit);
    return (EchoMode) d->echoMode;
}

void QLineEdit::setEchoMode(EchoMode mode)
{
    Q_D(QLineEdit);
    if(mode == (EchoMode)d->echoMode)
        return;
    d->echoMode = mode;
    d->updateTextLayout();
    update();
#ifdef Q_WS_MAC
    if (hasFocus())
        qt_mac_secure_keyboard(d->echoMode == Password || d->echoMode == NoEcho);
#endif
}


#ifndef QT_NO_VALIDATOR

const QValidator * QLineEdit::validator() const
{
    Q_D(const QLineEdit);
    return d->validator;
}

void QLineEdit::setValidator(const QValidator *v)
{
    Q_D(QLineEdit);
    d->validator = const_cast<QValidator*>(v);
}
#endif // QT_NO_VALIDATOR

#ifndef QT_NO_COMPLETER

void QLineEdit::setCompleter(QCompleter *c)
{
    Q_D(QLineEdit);
    if (c == d->completer)
        return;
    if (d->completer) {
        QObject::disconnect(d->completer, SIGNAL(activated(QString)),
                            this, SLOT(setText(QString)));
        QObject::disconnect(d->completer, SIGNAL(highlighted(QString)),
                         this, SLOT(_q_completionHighlighted(QString)));
        d->completer->setWidget(0);
        if (d->completer->parent() == this)
            delete d->completer;
    }
    d->completer = c;
    if (!c)
        return;
    c->setWidget(this);
    QObject::connect(c, SIGNAL(activated(QString)),
                     this, SLOT(setText(QString)));
    QObject::connect(c, SIGNAL(highlighted(QString)),
                     this, SLOT(_q_completionHighlighted(QString)));
}

QCompleter *QLineEdit::completer() const
{
    Q_D(const QLineEdit);
    return d->completer;
}

bool QLineEditPrivate::advanceToNextEnabledItem(int n /* n = 1 ? forward : backward */)
{
    while (true) {
        QModelIndex currentIndex = completer->currentIndex();
        if (!currentIndex.isValid())
            return false;
        if (completer->completionModel()->flags(currentIndex) & Qt::ItemIsEnabled)
            return true;
        if (!completer->setCurrentRow(completer->currentRow() + n))
            break;
    }

    return false;
}

void QLineEditPrivate::complete(int key)
{
    if (!completer || readOnly || echoMode != QLineEdit::Normal)
        return;

    if (completer->completionMode() == QCompleter::InlineCompletion) {
        if (key == Qt::Key_Backspace)
            return;
        int n = 1;
        if (key == Qt::Key_Up || key == Qt::Key_Down) {
            if (selend != 0 && selend != text.length())
                return;
            QString prefix = text.left(cursor);
            if (prefix != completer->completionPrefix()) {
                completer->setCompletionPrefix(prefix);
            } else {
                n = (key == Qt::Key_Up) ? -1 : +1;
                completer->setCurrentRow(completer->currentRow() + n);
            }
        } else
            completer->setCompletionPrefix(text);
        if (!advanceToNextEnabledItem(n))
            return;
    } else {
        if (text.isEmpty()) {
            completer->popup()->hide();
            return;
        }
        completer->setCompletionPrefix(text);
    }

    completer->complete();
}

void QLineEditPrivate::_q_completionHighlighted(QString newText)
{
    Q_Q(QLineEdit);
    if (completer->completionMode() != QCompleter::InlineCompletion)
        q->setText(newText);
    else {
        int c = cursor;
        q->setText(text.left(c) + newText.mid(c));
        q->setSelection(text.length(), c - newText.length());
    }
}
#endif // QT_NO_COMPLETER

QSize QLineEdit::sizeHint() const
{
    Q_D(const QLineEdit);
    ensurePolished();
    QFontMetrics fm(font());
    int h = qMax(fm.lineSpacing(), 14) + 2*verticalMargin
            + d->topmargin + d->bottommargin;
    int w = fm.width(QLatin1Char('x')) * 17 + 2*horizontalMargin
            + d->leftmargin + d->rightmargin; // "some"
    QStyleOptionFrame opt = d->getStyleOption();
    return (style()->sizeFromContents(QStyle::CT_LineEdit, &opt, QSize(w, h).
                                      expandedTo(QApplication::globalStrut()), this));
}


QSize QLineEdit::minimumSizeHint() const
{
    Q_D(const QLineEdit);
    ensurePolished();
    QFontMetrics fm = fontMetrics();
    int h = fm.height() + qMax(2*horizontalMargin, fm.leading())
            + d->topmargin + d->bottommargin;
    int w = fm.maxWidth() + d->leftmargin + d->rightmargin;
    QStyleOptionFrame opt = d->getStyleOption();
    return (style()->sizeFromContents(QStyle::CT_LineEdit, &opt, QSize(w, h).
                                      expandedTo(QApplication::globalStrut()), this));
}


int QLineEdit::cursorPosition() const
{
    Q_D(const QLineEdit);
    return d->cursor;
}

void QLineEdit::setCursorPosition(int pos)
{
    Q_D(QLineEdit);
    if (pos < 0)
        pos = 0;

    if (pos <= d->text.length())
        d->moveCursor(pos);
}

// ### What should this do if the point is outside of contentsRect? Currently returns 0.
int QLineEdit::cursorPositionAt(const QPoint &pos)
{
    Q_D(QLineEdit);
    return d->xToPos(pos.x());
}


#ifdef QT3_SUPPORT

bool QLineEdit::validateAndSet(const QString &newText, int newPos,
                                 int newMarkAnchor, int newMarkDrag)
{
    Q_D(QLineEdit);
    int priorState = d->undoState;
    d->selstart = 0;
    d->selend = d->text.length();
    d->removeSelectedText();
    d->insert(newText);
    d->finishChange(priorState);
    if (d->undoState > priorState) {
        d->cursor = newPos;
        d->selstart = qMin(newMarkAnchor, newMarkDrag);
        d->selend = qMax(newMarkAnchor, newMarkDrag);
        update();
        d->emitCursorPositionChanged();
        return true;
    }
    return false;
}
#endif //QT3_SUPPORT

Qt::Alignment QLineEdit::alignment() const
{
    Q_D(const QLineEdit);
    return QFlag(d->alignment);
}

void QLineEdit::setAlignment(Qt::Alignment alignment)
{
    Q_D(QLineEdit);
    d->alignment = alignment & Qt::AlignHorizontal_Mask;
    update();
}


void QLineEdit::cursorForward(bool mark, int steps)
{
    Q_D(QLineEdit);
    int cursor = d->cursor;
    if (steps > 0) {
        while(steps--)
            cursor = d->textLayout.nextCursorPosition(cursor);
    } else if (steps < 0) {
        while (steps++)
            cursor = d->textLayout.previousCursorPosition(cursor);
    }
    d->moveCursor(cursor, mark);
}


void QLineEdit::cursorBackward(bool mark, int steps)
{
    cursorForward(mark, -steps);
}

void QLineEdit::cursorWordForward(bool mark)
{
    Q_D(QLineEdit);
    d->moveCursor(d->textLayout.nextCursorPosition(d->cursor, QTextLayout::SkipWords), mark);
}

void QLineEdit::cursorWordBackward(bool mark)
{
    Q_D(QLineEdit);
    d->moveCursor(d->textLayout.previousCursorPosition(d->cursor, QTextLayout::SkipWords), mark);
}


void QLineEdit::backspace()
{
    Q_D(QLineEdit);
    int priorState = d->undoState;
    if (d->hasSelectedText()) {
        d->removeSelectedText();
    } else if (d->cursor) {
            --d->cursor;
            if (d->maskData)
                d->cursor = d->prevMaskBlank(d->cursor);
            QChar uc = d->text.at(d->cursor);
            if (d->cursor > 0 && uc.unicode() >= 0xdc00 && uc.unicode() < 0xe000) {
                // second half of a surrogate, check if we have the first half as well,
                // if yes delete both at once
                uc = d->text.at(d->cursor - 1);
                if (uc.unicode() >= 0xd800 && uc.unicode() < 0xdc00) {
                    d->del(true);
                    --d->cursor;
                }
            }
            d->del(true);
    }
    d->finishChange(priorState);
}

void QLineEdit::del()
{
    Q_D(QLineEdit);
    int priorState = d->undoState;
    if (d->hasSelectedText()) {
        d->removeSelectedText();
    } else {
        int n = d->textLayout.nextCursorPosition(d->cursor) - d->cursor;
        while (n--)
            d->del();
    }
    d->finishChange(priorState);
}

void QLineEdit::home(bool mark)
{
    Q_D(QLineEdit);
    d->moveCursor(0, mark);
}

void QLineEdit::end(bool mark)
{
    Q_D(QLineEdit);
    d->moveCursor(d->text.length(), mark);
}


bool QLineEdit::isModified() const
{
    Q_D(const QLineEdit);
    return d->modifiedState != d->undoState;
}

void QLineEdit::setModified(bool modified)
{
    Q_D(QLineEdit);
    if (modified)
        d->modifiedState = -1;
    else
        d->modifiedState = d->undoState;
}


bool QLineEdit::hasSelectedText() const
{
    Q_D(const QLineEdit);
    return d->hasSelectedText();
}

QString QLineEdit::selectedText() const
{
    Q_D(const QLineEdit);
    if (d->hasSelectedText())
        return d->text.mid(d->selstart, d->selend - d->selstart);
    return QString();
}

int QLineEdit::selectionStart() const
{
    Q_D(const QLineEdit);
    return d->hasSelectedText() ? d->selstart : -1;
}


#ifdef QT3_SUPPORT

bool QLineEdit::edited() const { return isModified(); }
void QLineEdit::setEdited(bool on) { setModified(on); }

int QLineEdit::characterAt(int xpos, QChar *chr) const
{
    Q_D(const QLineEdit);
    int pos = d->xToPos(xpos + contentsRect().x() - d->hscroll + horizontalMargin);
    if (chr && pos < (int) d->text.length())
        *chr = d->text.at(pos);
    return pos;

}

bool QLineEdit::getSelection(int *start, int *end)
{
    Q_D(QLineEdit);
    if (d->hasSelectedText() && start && end) {
        *start = d->selstart;
        *end = d->selend;
        return true;
    }
    return false;
}
#endif


void QLineEdit::setSelection(int start, int length)
{
    Q_D(QLineEdit);
    if (start < 0 || start > (int)d->text.length()) {
        qWarning("QLineEdit::setSelection: Invalid start position (%d)", start);
        return;
    } else {
        if (length > 0) {
            d->selstart = start;
            d->selend = qMin(start + length, (int)d->text.length());
            d->cursor = d->selend;
        } else {
            d->selstart = qMax(start + length, 0);
            d->selend = start;
            d->cursor = d->selstart;
        }
    }
    update();
    d->emitCursorPositionChanged();
}


bool QLineEdit::isUndoAvailable() const
{
    Q_D(const QLineEdit);
    return d->isUndoAvailable();
}

bool QLineEdit::isRedoAvailable() const
{
    Q_D(const QLineEdit);
    return d->isRedoAvailable();
}

bool QLineEdit::dragEnabled() const
{
    Q_D(const QLineEdit);
    return d->dragEnabled;
}

void QLineEdit::setDragEnabled(bool b)
{
    Q_D(QLineEdit);
    d->dragEnabled = b;
}


bool QLineEdit::hasAcceptableInput() const
{
    Q_D(const QLineEdit);
    return d->hasAcceptableInput(d->text);
}

QString QLineEdit::inputMask() const
{
    Q_D(const QLineEdit);
    return (d->maskData ? d->inputMask + QLatin1Char(';') + d->blank : QString());
}

void QLineEdit::setInputMask(const QString &inputMask)
{
    Q_D(QLineEdit);
    d->parseInputMask(inputMask);
    if (d->maskData)
        d->moveCursor(d->nextMaskBlank(0));
}

void QLineEdit::selectAll()
{
    Q_D(QLineEdit);
    d->selstart = d->selend = d->cursor = 0;
    d->moveCursor(d->text.length(), true);
}

void QLineEdit::deselect()
{
    Q_D(QLineEdit);
    d->deselect();
    d->finishChange();
}


void QLineEdit::insert(const QString &newText)
{
//     q->resetInputContext(); //#### FIX ME IN QT
    Q_D(QLineEdit);
    int priorState = d->undoState;
    d->removeSelectedText();
    d->insert(newText);
    d->finishChange(priorState);
}

void QLineEdit::clear()
{
    Q_D(QLineEdit);
    int priorState = d->undoState;
    resetInputContext();
    d->selstart = 0;
    d->selend = d->text.length();
    d->removeSelectedText();
    d->separate();
    d->finishChange(priorState);
}

void QLineEdit::undo()
{
    Q_D(QLineEdit);
    resetInputContext();
    d->undo();
    d->finishChange(-1, true);
}

void QLineEdit::redo()
{
    Q_D(QLineEdit);
    resetInputContext();
    d->redo();
    d->finishChange();
}


bool QLineEdit::isReadOnly() const
{
    Q_D(const QLineEdit);
    return d->readOnly;
}

void QLineEdit::setReadOnly(bool enable)
{
    Q_D(QLineEdit);
    d->readOnly = enable;
    update();
}


#ifndef QT_NO_CLIPBOARD

void QLineEdit::cut()
{
    if (hasSelectedText()) {
        copy();
        del();
    }
}


void QLineEdit::copy() const
{
    Q_D(const QLineEdit);
    d->copy();
}

void QLineEdit::paste()
{
    insert(QApplication::clipboard()->text(QClipboard::Clipboard));
}

void QLineEditPrivate::copy(bool clipboard) const
{
    Q_Q(const QLineEdit);
    QString t = q->selectedText();
    if (!t.isEmpty() && echoMode == QLineEdit::Normal) {
        q->disconnect(QApplication::clipboard(), SIGNAL(selectionChanged()), q, 0);
        QApplication::clipboard()->setText(t, clipboard ? QClipboard::Clipboard : QClipboard::Selection);
        q->connect(QApplication::clipboard(), SIGNAL(selectionChanged()),
                   q, SLOT(_q_clipboardChanged()));
    }
}

#endif // !QT_NO_CLIPBOARD

bool QLineEdit::event(QEvent * e)
{
    Q_D(QLineEdit);
    if (e->type() == QEvent::ShortcutOverride && !d->readOnly) {
        QKeyEvent* ke = (QKeyEvent*) e;
        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;
                }
            }
        } else if (ke->modifiers() & Qt::ControlModifier) {
            switch (ke->key()) {
// Those are too frequently used for application functionality
/*            case Qt::Key_A:
            case Qt::Key_B:
            case Qt::Key_D:
            case Qt::Key_E:
            case Qt::Key_F:
            case Qt::Key_H:
            case Qt::Key_K:
*/
            case Qt::Key_C:
            case Qt::Key_V:
            case Qt::Key_X:
            case Qt::Key_Y:
            case Qt::Key_Z:
            case Qt::Key_Left:
            case Qt::Key_Right:
#if !defined(Q_WS_MAC)
            case Qt::Key_Insert:
            case Qt::Key_Delete:
#endif
                ke->accept();
            default:
                break;
            }
        }
    } else if (e->type() == QEvent::Timer) {
        // should be timerEvent, is here for binary compatibility
        int timerId = ((QTimerEvent*)e)->timerId();
        if (timerId == d->cursorTimer) {
            QStyleOptionFrame opt = d->getStyleOption();
            if(!hasSelectedText()
               || style()->styleHint(QStyle::SH_BlinkCursorWhenTextSelected, &opt, this))
                d->setCursorVisible(!d->cursorVisible);
#ifndef QT_NO_DRAGANDDROP
        } else if (timerId == d->dndTimer.timerId()) {
            d->drag();
#endif
        }
        else if (timerId == d->tripleClickTimer.timerId())
            d->tripleClickTimer.stop();
#ifdef QT_KEYPAD_NAVIGATION
        else if (timerId == d->deleteAllTimer.timerId()) {
            d->deleteAllTimer.stop();
            clear();
        }
#endif
    } else if (e->type() == QEvent::ContextMenu) {
#ifndef QT_NO_IM
        if (d->composeMode())
            return true;
#endif
        d->separate();
    }
#ifdef QT_KEYPAD_NAVIGATION
    else if (e->type() == QEvent::KeyRelease) {
        if (QApplication::keypadNavigationEnabled()) {
            QKeyEvent *ke = (QKeyEvent *)e;
            if ( !ke->isAutoRepeat() && !isReadOnly()
                    && ke->key() == Qt::Key_Back
                    && d->deleteAllTimer.isActive()) {
                d->deleteAllTimer.stop();
                backspace();
                ke->accept();
                return true;
            }
        }
    }
#endif
    return QWidget::event(e);
}

void QLineEdit::mousePressEvent(QMouseEvent* e)
{
    Q_D(QLineEdit);
    if (d->sendMouseEventToInputContext(e))
  return;
    if (e->button() == Qt::RightButton)
        return;
#ifdef QT_KEYPAD_NAVIGATION
    if (QApplication::keypadNavigationEnabled() && !hasEditFocus())
        setEditFocus(true);
#endif
    if (d->tripleClickTimer.isActive() && (e->pos() - d->tripleClick).manhattanLength() <
         QApplication::startDragDistance()) {
        selectAll();
        return;
    }
    bool mark = e->modifiers() & Qt::ShiftModifier;
    int cursor = d->xToPos(e->pos().x());
#ifndef QT_NO_DRAGANDDROP
    if (!mark && d->dragEnabled && d->echoMode == Normal &&
         e->button() == Qt::LeftButton && d->inSelection(e->pos().x())) {
        d->cursor = cursor;
        update();
        d->dndPos = e->pos();
        if (!d->dndTimer.isActive())
            d->dndTimer.start(QApplication::startDragTime(), this);
        d->emitCursorPositionChanged();
    } else
#endif
    {
        d->moveCursor(cursor, mark);
    }
}

void QLineEdit::mouseMoveEvent(QMouseEvent * e)
{
    Q_D(QLineEdit);
    if (d->sendMouseEventToInputContext(e))
  return;

    if (e->buttons() & Qt::LeftButton) {
#ifndef QT_NO_DRAGANDDROP
        if (d->dndTimer.isActive()) {
            if ((d->dndPos - e->pos()).manhattanLength() > QApplication::startDragDistance())
                d->drag();
        } else
#endif
        {
            d->moveCursor(d->xToPos(e->pos().x()), true);
        }
    }
}

void QLineEdit::mouseReleaseEvent(QMouseEvent* e)
{
    Q_D(QLineEdit);
    if (d->sendMouseEventToInputContext(e))
  return;
#ifndef QT_NO_DRAGANDDROP
    if (e->button() == Qt::LeftButton) {
        if (d->dndTimer.isActive()) {
            d->dndTimer.stop();
            deselect();
            return;
        }
    }
#endif
#ifndef QT_NO_CLIPBOARD
    if (QApplication::clipboard()->supportsSelection()) {
        if (e->button() == Qt::LeftButton) {
            d->copy(false);
        } else if (!d->readOnly && e->button() == Qt::MidButton) {
            d->deselect();
            insert(QApplication::clipboard()->text(QClipboard::Selection));
        }
    }
#endif
}

void QLineEdit::mouseDoubleClickEvent(QMouseEvent* e)
{
    Q_D(QLineEdit);
    if (d->sendMouseEventToInputContext(e))
  return;
    if (e->button() == Qt::LeftButton) {
        deselect();
        d->cursor = d->xToPos(e->pos().x());
        d->cursor = d->textLayout.previousCursorPosition(d->cursor, QTextLayout::SkipWords);
        // ## text layout should support end of words.
        int end = d->textLayout.nextCursorPosition(d->cursor, QTextLayout::SkipWords);
        while (end > d->cursor && d->text[end-1].isSpace())
            --end;
        d->moveCursor(end, true);
        d->tripleClickTimer.start(QApplication::doubleClickInterval(), this);
        d->tripleClick = e->pos();
    }
}

void QLineEdit::keyPressEvent(QKeyEvent *event)
{
    Q_D(QLineEdit);

#ifndef QT_NO_COMPLETER
    if (d->completer && d->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:
           d->completer->popup()->hide(); // just hide. will end up propagating to parent
       default:
           break; // normal key processing
       }
    }
#endif // QT_NO_COMPLETER

#ifdef QT_KEYPAD_NAVIGATION
    bool select = false;
    switch (event->key()) {
        case Qt::Key_Select:
            if (QApplication::keypadNavigationEnabled()) {
                if (hasEditFocus()) {
                    setEditFocus(false);
                    select = true;
                }
            }
            break;
        case Qt::Key_Back:
        case Qt::Key_No:
            if (!QApplication::keypadNavigationEnabled() || !hasEditFocus()) {
                event->ignore();
                return;
            }
            break;
        default:
            if (QApplication::keypadNavigationEnabled()) {
                if (!hasEditFocus() && !(event->modifiers() & Qt::ControlModifier)) {
                    if (!event->text().isEmpty() && event->text().at(0).isPrint()
                        && !isReadOnly())
                    {
                        setEditFocus(true);
                        clear();
                    } else {
                        event->ignore();
                        return;
                    }
                }
            }
    }



    if (QApplication::keypadNavigationEnabled() && !select && !hasEditFocus()) {
        setEditFocus(true);
        if (event->key() == Qt::Key_Select)
            return; // Just start. No action.
    }
#endif


    if(echoMode() == PasswordEchoOnEdit &&
       !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))
    {
        setEchoMode(Normal);
        clear();
        d->resumePassword = true;
    }

    d->setCursorVisible(true);
    if (event->key() == Qt::Key_Enter || event->key() == Qt::Key_Return) {
        if (hasAcceptableInput() || d->fixup()) {
            emit returnPressed();
            d->emitingEditingFinished = true;
            emit editingFinished();
            d->emitingEditingFinished = false;
        }
        event->ignore();
        return;
    }
    bool unknown = false;

    if (false) {
    }
#ifndef QT_NO_SHORTCUT
    else if (event == QKeySequence::Undo) {
        if (!d->readOnly)
            undo();
    }
    else if (event == QKeySequence::Redo) {
        if (!d->readOnly)
            redo();
    }
    else if (event == QKeySequence::SelectAll) {
        selectAll();
    }
#ifndef QT_NO_CLIPBOARD
    else if (event == QKeySequence::Copy) {
        copy();
    }
    else if (event == QKeySequence::Paste) {
        if (!d->readOnly)
            paste();
    }
    else if (event == QKeySequence::Cut) {
        if (!d->readOnly) {
            copy();
            del();
        }
    }
    else if (event == QKeySequence::DeleteEndOfLine) {
        if (!d->readOnly) {
            setSelection(d->cursor, d->text.size());
            copy();
            del();
        }
    }
#endif //QT_NO_CLIPBOARD
    else if (event == QKeySequence::MoveToStartOfLine) {
        home(0);
    }
    else if (event == QKeySequence::MoveToEndOfLine) {
        end(0);
    }
    else if (event == QKeySequence::SelectStartOfLine) {
        home(1);
    }
    else if (event == QKeySequence::SelectEndOfLine) {
        end(1);
    }
    else if (event == QKeySequence::MoveToNextChar) {
#ifndef Q_WS_WIN
        if (d->hasSelectedText()) {
#else
        if (d->hasSelectedText() && d->completer
            && d->completer->completionMode() == QCompleter::InlineCompletion) {
#endif
            d->moveCursor(d->selend, false);
        } else {
            cursorForward(0, layoutDirection() == Qt::LeftToRight ? 1 : -1);
        }
    }
    else if (event == QKeySequence::SelectNextChar) {
        cursorForward(1, layoutDirection() == Qt::LeftToRight ? 1 : -1);
    }
    else if (event == QKeySequence::MoveToPreviousChar) {
#ifndef Q_WS_WIN
        if (d->hasSelectedText()) {
#else
        if (d->hasSelectedText() && d->completer
            && d->completer->completionMode() == QCompleter::InlineCompletion) {
#endif
            d->moveCursor(d->selstart, false);
        } else {
            cursorBackward(0, layoutDirection() == Qt::LeftToRight ? 1 : -1);
        }
    }
    else if (event == QKeySequence::SelectPreviousChar) {
        cursorBackward(1, layoutDirection() == Qt::LeftToRight ? 1 : -1);
    }
    else if (event == QKeySequence::MoveToNextWord) {
        if (echoMode() == Normal)
            layoutDirection() == Qt::LeftToRight ? cursorWordForward(0) : cursorWordBackward(0);
        else
            layoutDirection() == Qt::LeftToRight ? end(0) : home(0);
    }
    else if (event == QKeySequence::MoveToPreviousWord) {
        if (echoMode() == Normal)
            layoutDirection() == Qt::LeftToRight ? cursorWordBackward(0) : cursorWordForward(0);
        else if (!d->readOnly) {
            layoutDirection() == Qt::LeftToRight ? home(0) : end(0);
        }
    }
    else if (event == QKeySequence::SelectNextWord) {
        if (echoMode() == Normal)
            layoutDirection() == Qt::LeftToRight ? cursorWordForward(1) : cursorWordBackward(1);
        else
            layoutDirection() == Qt::LeftToRight ? end(1) : home(1);
    }
    else if (event == QKeySequence::SelectPreviousWord) {
        if (echoMode() == Normal)
            layoutDirection() == Qt::LeftToRight ? cursorWordBackward(1) : cursorWordForward(1);
        else
            layoutDirection() == Qt::LeftToRight ? home(1) : end(1);
    }
    else if (event == QKeySequence::Delete) {
        if (!d->readOnly)
            del();
    }
    else if (event == QKeySequence::DeleteEndOfWord) {
        if (!d->readOnly) {
            cursorWordForward(true);
            del();
        }
    }
    else if (event == QKeySequence::DeleteStartOfWord) {
        if (!d->readOnly) {
            cursorWordBackward(true);
            del();
        }
    }
#endif // QT_NO_SHORTCUT
    else {
#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);
                }
            }
        }
#endif
        if (event->modifiers() & Qt::ControlModifier) {
            switch (event->key()) {
            case Qt::Key_Backspace:
                if (!d->readOnly) {
                    cursorWordBackward(true);
                    del();
                }
                break;
#ifndef QT_NO_COMPLETER
            case Qt::Key_Up:
            case Qt::Key_Down:
                d->complete(event->key());
                break;
#endif
#if defined(Q_WS_X11)
            case Qt::Key_E:
                end(0);
                break;

            case Qt::Key_U:
                if (!d->readOnly) {
                    setSelection(0, d->text.size());
#ifndef QT_NO_CLIPBOARD
                    copy();
#endif
                    del();
                }
            break;
#endif
            default:
                unknown = true;
            }
        } else { // ### check for *no* modifier
            switch (event->key()) {
            case Qt::Key_Backspace:
                if (!d->readOnly) {
                    backspace();
#ifndef QT_NO_COMPLETER
                    d->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(d->origText);

                        if (d->resumePassword)
                        {
                            setEchoMode(PasswordEchoOnEdit);
                            d->resumePassword = false;
                        }

                        setEditFocus(false);
                    } else if (!d->deleteAllTimer.isActive()) {
                        d->deleteAllTimer.start(750, this);
                    }
                } else {
                    unknown = true;
                }
                break;
#endif

            default:
                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);
        d->updateTextLayout();
        update();
        unknown = false;
    }

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

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

bool QLineEditPrivate::sendMouseEventToInputContext( QMouseEvent *e )
{
#if !defined QT_NO_IM
    Q_Q(QLineEdit);
    if ( composeMode() ) {
  int tmp_cursor = xToPos(e->pos().x());
  int mousePos = tmp_cursor - cursor;
  if ( mousePos < 0 || mousePos > textLayout.preeditAreaText().length() ) {
            mousePos = -1;
      // don't send move events outside the preedit area
            if ( e->type() == QEvent::MouseMove )
                return true;
        }

        QInputContext *qic = q->inputContext();
        if ( qic )
            // may be causing reset() in some input methods
            qic->mouseHandler(mousePos, e);
        if (!textLayout.preeditAreaText().isEmpty())
            return true;
    }
#else
    Q_UNUSED(e);
#endif

    return false;
}

void QLineEdit::inputMethodEvent(QInputMethodEvent *e)
{
    Q_D(QLineEdit);
    if (d->readOnly) {
        e->ignore();
        return;
    }


    if(echoMode() == PasswordEchoOnEdit)
    {
        setEchoMode(Normal);
        clear();
        d->resumePassword = true;
    }


#ifdef QT_KEYPAD_NAVIGATION
    if (QApplication::keypadNavigationEnabled() && !hasEditFocus())
        setEditFocus(true);
#endif

    int priorState = d->undoState;
    d->removeSelectedText();

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

    d->cursor += e->replacementStart();

    // insert commit string
    if (e->replacementLength()) {
        d->selstart = d->cursor;
        d->selend = d->selstart + e->replacementLength();
        d->removeSelectedText();
    }
    if (!e->commitString().isEmpty())
        d->insert(e->commitString());

    d->cursor = c;

    d->textLayout.setPreeditArea(d->cursor, e->preeditString());
    d->preeditCursor = e->preeditString().length();
    d->hideCursor = false;
    QList<QTextLayout::FormatRange> formats;
    for (int i = 0; i < e->attributes().size(); ++i) {
        const QInputMethodEvent::Attribute &a = e->attributes().at(i);
        if (a.type == QInputMethodEvent::Cursor) {
            d->preeditCursor = a.start;
            d->hideCursor = !a.length;
        } else if (a.type == QInputMethodEvent::TextFormat) {
            QTextCharFormat f = qvariant_cast<QTextFormat>(a.value).toCharFormat();
            if (f.isValid()) {
                QTextLayout::FormatRange o;
                o.start = a.start + d->cursor;
                o.length = a.length;
                o.format = f;
                formats.append(o);
            }
        }
    }
    d->textLayout.setAdditionalFormats(formats);
    d->updateTextLayout();
    update();
    if (!e->commitString().isEmpty())
        d->emitCursorPositionChanged();
    d->finishChange(priorState);
}

QVariant QLineEdit::inputMethodQuery(Qt::InputMethodQuery property) const
{
    Q_D(const QLineEdit);
    switch(property) {
    case Qt::ImMicroFocus:
        return d->cursorRect();
    case Qt::ImFont:
        return font();
    case Qt::ImCursorPosition:
        return QVariant(d->cursor);
    case Qt::ImSurroundingText:
        return QVariant(d->text);
    case Qt::ImCurrentSelection:
        return QVariant(selectedText());
    default:
        return QVariant();
    }
}

void QLineEdit::focusInEvent(QFocusEvent *e)
{
    Q_D(QLineEdit);
    if (e->reason() == Qt::TabFocusReason ||
         e->reason() == Qt::BacktabFocusReason  ||
         e->reason() == Qt::ShortcutFocusReason)
        if (d->maskData)
            d->moveCursor(d->nextMaskBlank(0));
        else if (!d->hasSelectedText())
            selectAll();
    if (!d->cursorTimer) {
        int cft = QApplication::cursorFlashTime();
        d->cursorTimer = cft ? startTimer(cft/2) : -1;
    }
    QStyleOptionFrame opt = d->getStyleOption();
    if((!hasSelectedText() && d->textLayout.preeditAreaText().isEmpty())
       || style()->styleHint(QStyle::SH_BlinkCursorWhenTextSelected, &opt, this))
        d->setCursorVisible(true);
#ifdef Q_WS_MAC
    if (d->echoMode == Password || d->echoMode == NoEcho)
        qt_mac_secure_keyboard(true);
#endif
#ifdef QT_KEYPAD_NAVIGATION
    d->origText = d->text;
#endif
    update();
}

void QLineEdit::focusOutEvent(QFocusEvent *e)
{
    Q_D(QLineEdit);


    if(d->resumePassword){
        setEchoMode(PasswordEchoOnEdit);
        d->resumePassword = false;
    }


    Qt::FocusReason reason = e->reason();
    if (reason != Qt::ActiveWindowFocusReason &&
        reason != Qt::PopupFocusReason)
        deselect();

    d->setCursorVisible(false);
    if (d->cursorTimer > 0)
        killTimer(d->cursorTimer);
    d->cursorTimer = 0;
    if (reason != Qt::PopupFocusReason
        && !(QApplication::activePopupWidget() && QApplication::activePopupWidget()->parentWidget() == this)) {
        if (!d->emitingEditingFinished) {
            if (hasAcceptableInput() || d->fixup()) {
                d->emitingEditingFinished = true;
                emit editingFinished();
                d->emitingEditingFinished = false;
            }
        }
#ifdef QT3_SUPPORT
        emit lostFocus();
#endif
    }
#ifdef Q_WS_MAC
    if (d->echoMode == Password || d->echoMode == NoEcho)
        qt_mac_secure_keyboard(false);
#endif
#ifdef QT_KEYPAD_NAVIGATION
    d->origText = QString();
#endif
    update();
}

void QLineEdit::paintEvent(QPaintEvent *)
{
    Q_D(QLineEdit);
    QPainter p(this);

    QRect r = rect();
    const QPalette &pal = palette();

    QStyleOptionFrame panel = d->getStyleOption();
    style()->drawPrimitive(QStyle::PE_PanelLineEdit, &panel, &p, this);
    r = style()->subElementRect(QStyle::SE_LineEditContents, &panel, this);
    p.setClipRect(r);

    QFontMetrics fm = fontMetrics();
    QRect lineRect(r.x() + horizontalMargin, r.y() + (r.height() - fm.height() + 1) / 2,
                    r.width() - 2*horizontalMargin, fm.height());
    QTextLine line = d->textLayout.lineAt(0);

    int cursor = d->cursor;
    if (d->preeditCursor != -1)
        cursor += d->preeditCursor;
    // locate cursor position
    int cix = qRound(line.cursorToX(cursor));

    // horizontal scrolling
    int minLB = qMax(0, -fm.minLeftBearing());
    int minRB = qMax(0, -fm.minRightBearing());


    int widthUsed = qRound(line.naturalTextWidth()) + 1 + minRB;
    if ((minLB + widthUsed) <=  lineRect.width()) {
        Qt::Alignment va = QStyle::visualAlignment(layoutDirection(), QFlag(d->alignment));
        va &= ~(Qt::AlignAbsolute|Qt::AlignVertical_Mask);
        switch (va) {
        case Qt::AlignRight:
            d->hscroll = widthUsed - lineRect.width() + 1;
            break;
        case Qt::AlignHCenter:
            d->hscroll = (widthUsed - lineRect.width()) / 2;
            break;
        default:
            // Left
            d->hscroll = 0;
            break;
        }
        d->hscroll -= minLB;
    } else if (cix - d->hscroll >= lineRect.width()) {
        d->hscroll = cix - lineRect.width() + 1;
    } else if (cix - d->hscroll < 0) {
        d->hscroll = cix;
    } else if (widthUsed - d->hscroll < lineRect.width()) {
        d->hscroll = widthUsed - lineRect.width() + 1;
    }
    // the y offset is there to keep the baseline constant in case we have script changes in the text.
    QPoint topLeft = lineRect.topLeft() - QPoint(d->hscroll, d->ascent-fm.ascent());

    // draw text, selections and cursors
    p.setPen(pal.text().color());

    QVector<QTextLayout::FormatRange> selections;
    if (d->selstart < d->selend || (d->cursorVisible && d->maskData)) {
        QTextLayout::FormatRange o;
        const QPalette &pal = palette();
        if (d->selstart < d->selend) {
            o.start = d->selstart;
            o.length = d->selend - d->selstart;
            o.format.setBackground(pal.brush(QPalette::Highlight));
            o.format.setForeground(pal.brush(QPalette::HighlightedText));
        } else {
            // mask selection
            o.start = d->cursor;
            o.length = 1;
            o.format.setBackground(pal.brush(QPalette::Text));
            o.format.setForeground(pal.brush(QPalette::Window));
        }
        selections.append(o);
    }

    // Asian users see an IM selection text as cursor on candidate
    // selection phase of input method, so the ordinary cursor should be
    // invisible if we have a preedit string.
    d->textLayout.draw(&p, topLeft, selections, r);
    if (d->cursorVisible && !d->readOnly && !d->hideCursor)
        d->textLayout.drawCursor(&p, topLeft, cursor);

}


#ifndef QT_NO_DRAGANDDROP

void QLineEdit::dragMoveEvent(QDragMoveEvent *e)
{
    Q_D(QLineEdit);
    if (!d->readOnly && e->mimeData()->hasFormat(QLatin1String("text/plain"))) {
        e->acceptProposedAction();
        d->cursor = d->xToPos(e->pos().x());
        d->cursorVisible = true;
        update();
        d->emitCursorPositionChanged();
    }
}

void QLineEdit::dragEnterEvent(QDragEnterEvent * e)
{
    QLineEdit::dragMoveEvent(e);
}

void QLineEdit::dragLeaveEvent(QDragLeaveEvent *)
{
    Q_D(QLineEdit);
    if (d->cursorVisible) {
        d->cursorVisible = false;
        update();
    }
}

void QLineEdit::dropEvent(QDropEvent* e)
{
    Q_D(QLineEdit);
    QString str = e->mimeData()->text();

    if (!str.isNull() && !d->readOnly) {
        if (e->source() == this && e->dropAction() == Qt::CopyAction)
            deselect();
        d->cursor =d->xToPos(e->pos().x());
        int selStart = d->cursor;
        int oldSelStart = d->selstart;
        int oldSelEnd = d->selend;
        d->cursorVisible = false;
        e->acceptProposedAction();
        insert(str);
        if (e->source() == this) {
            if (e->dropAction() == Qt::MoveAction) {
                if (selStart > oldSelStart && selStart <= oldSelEnd)
                    setSelection(oldSelStart, str.length());
                else if (selStart > oldSelEnd)
                    setSelection(selStart - str.length(), str.length());
                else
                    setSelection(selStart, str.length());
            } else {
                setSelection(selStart, str.length());
            }
        }
    } else {
        e->ignore();
        update();
    }
}

void QLineEditPrivate::drag()
{
    Q_Q(QLineEdit);
    dndTimer.stop();
    QMimeData *data = new QMimeData;
    data->setText(q->selectedText());
    QDrag *drag = new QDrag(q);
    drag->setMimeData(data);
    Qt::DropAction action = drag->start();
    if (action == Qt::MoveAction && !readOnly && drag->target() != q) {
        int priorState = undoState;
        removeSelectedText();
        finishChange(priorState);
    }
}

#endif // QT_NO_DRAGANDDROP

#ifndef QT_NO_CONTEXTMENU

void QLineEdit::contextMenuEvent(QContextMenuEvent *event)
{
    QPointer<QMenu> menu = createStandardContextMenu();
    menu->exec(event->globalPos());
    delete menu;
}

QMenu *QLineEdit::createStandardContextMenu()
{
    Q_D(QLineEdit);
    d->actions[QLineEditPrivate::UndoAct]->setEnabled(d->isUndoAvailable());
    d->actions[QLineEditPrivate::RedoAct]->setEnabled(d->isRedoAvailable());
#ifndef QT_NO_CLIPBOARD
    d->actions[QLineEditPrivate::CutAct]->setEnabled(!d->readOnly && d->hasSelectedText());
    d->actions[QLineEditPrivate::CopyAct]->setEnabled(d->hasSelectedText());
    d->actions[QLineEditPrivate::PasteAct]->setEnabled(!d->readOnly && !QApplication::clipboard()->text().isEmpty());
#else
    d->actions[QLineEditPrivate::CutAct]->setEnabled(false);
    d->actions[QLineEditPrivate::CopyAct]->setEnabled(false);
    d->actions[QLineEditPrivate::PasteAct]->setEnabled(false);
#endif
    d->actions[QLineEditPrivate::ClearAct]->setEnabled(!d->readOnly && !d->text.isEmpty() && d->hasSelectedText());
    d->actions[QLineEditPrivate::SelectAllAct]->setEnabled(!d->text.isEmpty() && !d->allSelected());

    QMenu *popup = new QMenu(this);
    popup->setObjectName(QLatin1String("qt_edit_menu"));
    popup->addAction(d->actions[QLineEditPrivate::UndoAct]);
    popup->addAction(d->actions[QLineEditPrivate::RedoAct]);
    popup->addSeparator();
    popup->addAction(d->actions[QLineEditPrivate::CutAct]);
    popup->addAction(d->actions[QLineEditPrivate::CopyAct]);
    popup->addAction(d->actions[QLineEditPrivate::PasteAct]);
    popup->addAction(d->actions[QLineEditPrivate::ClearAct]);
    popup->addSeparator();
    popup->addAction(d->actions[QLineEditPrivate::SelectAllAct]);
#if !defined(QT_NO_IM)
    QInputContext *qic = inputContext();
    if (qic) {
        QList<QAction *> imActions = qic->actions();
        for (int i = 0; i < imActions.size(); ++i)
            popup->addAction(imActions.at(i));
    }
#endif

#if defined(Q_WS_WIN) || defined(Q_WS_X11)
#if defined(Q_WS_WIN)
    extern bool qt_use_rtl_extensions;
    if (!d->readOnly && qt_use_rtl_extensions) {
#elif defined(Q_WS_X11)
    if (!d->readOnly) {
#endif
        popup->addSeparator();
        QUnicodeControlCharacterMenu *ctrlCharacterMenu = new QUnicodeControlCharacterMenu(this, popup);
        popup->addMenu(ctrlCharacterMenu);
    }
#endif
    return popup;
}
#endif // QT_NO_CONTEXTMENU

void QLineEdit::changeEvent(QEvent *ev)
{
    Q_D(QLineEdit);
    if(ev->type() == QEvent::ActivationChange) {
        if (!palette().isEqual(QPalette::Active, QPalette::Inactive))
            update();
    } else if (ev->type() == QEvent::FontChange || ev->type() == QEvent::StyleChange) {
        d->updateTextLayout();
    }
    QWidget::changeEvent(ev);
}

void QLineEditPrivate::_q_clipboardChanged()
{
}

void QLineEditPrivate::_q_deleteSelected()
{
    Q_Q(QLineEdit);
    if (!hasSelectedText())
        return;

    int priorState = undoState;
    q->resetInputContext();
    removeSelectedText();
    separate();
    finishChange(priorState);
}
void QLineEditPrivate::init(const QString& txt)
{
    Q_Q(QLineEdit);
#ifndef QT_NO_CURSOR
    q->setCursor(Qt::IBeamCursor);
#endif
    q->setFocusPolicy(Qt::StrongFocus);
    q->setAttribute(Qt::WA_InputMethodEnabled);
    //   Specifies that this widget can use more, but is able to survive on
    //   less, horizontal space; and is fixed vertically.
    q->setSizePolicy(QSizePolicy(QSizePolicy::Expanding, QSizePolicy::Fixed));
    q->setBackgroundRole(QPalette::Base);
    q->setAttribute(Qt::WA_KeyCompression);
    q->setMouseTracking(true);
    q->setAcceptDrops(true);
    text = txt;
    updateTextLayout();
    cursor = text.length();

#ifndef QT_NO_MENU
    actions[UndoAct] = new QAction(QLineEdit::tr("&Undo") + ACCEL_KEY(Z), q);
    QObject::connect(actions[UndoAct], SIGNAL(triggered()), q, SLOT(undo()));
    actions[RedoAct] = new QAction(QLineEdit::tr("&Redo") + ACCEL_KEY(Y), q);
    QObject::connect(actions[RedoAct], SIGNAL(triggered()), q, SLOT(redo()));
    //popup->insertSeparator();
#ifndef QT_NO_CLIPBOARD
    actions[CutAct] = new QAction(QLineEdit::tr("Cu&t") + ACCEL_KEY(X), q);
    QObject::connect(actions[CutAct], SIGNAL(triggered()), q, SLOT(cut()));
    actions[CopyAct] = new QAction(QLineEdit::tr("&Copy") + ACCEL_KEY(C), q);
    QObject::connect(actions[CopyAct], SIGNAL(triggered()), q, SLOT(copy()));
    actions[PasteAct] = new QAction(QLineEdit::tr("&Paste") + ACCEL_KEY(V), q);
    QObject::connect(actions[PasteAct], SIGNAL(triggered()), q, SLOT(paste()));
#endif
    actions[ClearAct] = new QAction(QLineEdit::tr("Delete"), q);
    QObject::connect(actions[ClearAct], SIGNAL(triggered()), q, SLOT(_q_deleteSelected()));
    //popup->insertSeparator();
    actions[SelectAllAct] = new QAction(QLineEdit::tr("Select All")
                                        + ACCEL_KEY(A)
                                        , q);
    QObject::connect(actions[SelectAllAct], SIGNAL(triggered()), q, SLOT(selectAll()));
#endif // QT_NO_MENU
}

void QLineEditPrivate::updateTextLayout()
{
    // replace all non-printable characters with spaces (to avoid
    // drawing boxes when using fonts that don't have glyphs for such
    // characters)
    Q_Q(QLineEdit);
    QString str = q->displayText();
    QChar* uc = str.data();
    for (int i = 0; i < (int)str.length(); ++i) {
        if (!uc[i].isPrint() || uc[i] == QChar::LineSeparator)
            uc[i] = QChar(0x0020);
    }
    textLayout.setFont(q->font());
    textLayout.setText(str);
    QTextOption option;
    option.setTextDirection(q->layoutDirection());
    option.setFlags(QTextOption::IncludeTrailingSpaces);
    textLayout.setTextOption(option);

    textLayout.beginLayout();
    QTextLine l = textLayout.createLine();
    textLayout.endLayout();
    ascent = qRound(l.ascent());
}

int QLineEditPrivate::xToPos(int x, QTextLine::CursorPosition betweenOrOn) const
{
    QRect cr = adjustedContentsRect();
    x-= cr.x() - hscroll + horizontalMargin;
    QTextLine l = textLayout.lineAt(0);
    return l.xToCursor(x, betweenOrOn);
}

QRect QLineEditPrivate::cursorRect() const
{
    Q_Q(const QLineEdit);
    QRect cr = adjustedContentsRect();
    int cix = cr.x() - hscroll + horizontalMargin;
    QTextLine l = textLayout.lineAt(0);
    int c = cursor;
    if (preeditCursor != -1)
        c += preeditCursor;
    cix += qRound(l.cursorToX(c));
    int ch = qMin(cr.height(), q->fontMetrics().height() + 1);
    return QRect(cix-5, cr.y() + (cr.height() -  ch) / 2, 10, ch);
}

QRect QLineEditPrivate::adjustedContentsRect() const
{
    Q_Q(const QLineEdit);
    QStyleOptionFrame opt = getStyleOption();
    return q->style()->subElementRect(QStyle::SE_LineEditContents, &opt, q);
}

bool QLineEditPrivate::fixup() // this function assumes that validate currently returns != Acceptable
{
#ifndef QT_NO_VALIDATOR
    if (validator) {
        QString textCopy = text;
        int cursorCopy = cursor;
        validator->fixup(textCopy);
        if (validator->validate(textCopy, cursorCopy) == QValidator::Acceptable) {
            if (textCopy != text || cursorCopy != cursor)
                setText(textCopy, cursorCopy);
            return true;
        }
    }
#endif
    return false;
}


void QLineEditPrivate::moveCursor(int pos, bool mark)
{
    Q_Q(QLineEdit);
    if (pos != cursor) {
        separate();
        if (maskData)
            pos = pos > cursor ? nextMaskBlank(pos) : prevMaskBlank(pos);
    }
    bool fullUpdate = mark || hasSelectedText();
    if (mark) {
        int anchor;
        if (selend > selstart && cursor == selstart)
            anchor = selend;
        else if (selend > selstart && cursor == selend)
            anchor = selstart;
        else
            anchor = cursor;
        selstart = qMin(anchor, pos);
        selend = qMax(anchor, pos);
        updateTextLayout();
    } else {
        deselect();
    }
    if (fullUpdate) {
        cursor = pos;
        q->update();
    } else {
        setCursorVisible(false);
        cursor = pos;
        setCursorVisible(true);
        if (!adjustedContentsRect().contains(cursorRect()))
            q->update();
    }
    QStyleOptionFrame opt = getStyleOption();
    if (mark && !q->style()->styleHint(QStyle::SH_BlinkCursorWhenTextSelected, &opt, q))
        setCursorVisible(false);
    if (mark || selDirty) {
        selDirty = false;
        emit q->selectionChanged();
    }
    emitCursorPositionChanged();
}

void QLineEditPrivate::finishChange(int validateFromState, bool update, bool edited)
{
    Q_Q(QLineEdit);
    bool lineDirty = selDirty;
    if (textDirty) {
        // do validation
        bool wasValidInput = validInput;
        validInput = true;
#ifndef QT_NO_VALIDATOR
        if (validator) {
            validInput = false;
            QString textCopy = text;
            int cursorCopy = cursor;
            validInput = (validator->validate(textCopy, cursorCopy) != QValidator::Invalid);
            if (validInput) {
                if (text != textCopy) {
                    setText(textCopy, cursorCopy);
                    return;
                }
                cursor = cursorCopy;
            }
        }
#endif
        if (validateFromState >= 0 && wasValidInput && !validInput) {
            undo(validateFromState);
            history.resize(undoState);
            if (modifiedState > undoState)
                modifiedState = -1;
            validInput = true;
            textDirty = false;
        }
        updateTextLayout();
        lineDirty |= textDirty;
        if (textDirty) {
            textDirty = false;
            QString actualText = maskData ? stripString(text) : text;
            if (edited)
                emit q->textEdited(actualText);
            q->updateMicroFocus();
            emit q->textChanged(actualText);
#ifndef QT_NO_COMPLETER
            if (edited && completer && completer->completionMode() != QCompleter::InlineCompletion)
                complete(-1); // update the popup on cut/paste/del
#endif
        }
#ifndef QT_NO_ACCESSIBILITY
        QAccessible::updateAccessibility(q, 0, QAccessible::ValueChanged);
#endif
    }
    if (selDirty) {
        selDirty = false;
        emit q->selectionChanged();
    }
    if (lineDirty || update)
        q->update();
    emitCursorPositionChanged();
}

void QLineEditPrivate::emitCursorPositionChanged()
{
    Q_Q(QLineEdit);
    if (cursor != lastCursorPos) {
        const int oldLast = lastCursorPos;
        lastCursorPos = cursor;
        emit q->cursorPositionChanged(oldLast, cursor);
    }
}

void QLineEditPrivate::setText(const QString& txt, int pos, bool edited)
{
    Q_Q(QLineEdit);
    q->resetInputContext();
    deselect();
    QString oldText = text;
    if (maskData) {
        text = maskString(0, txt, true);
        text += clearString(text.length(), maxLength - text.length());
    } else {
        text = txt.isEmpty() ? txt : txt.left(maxLength);
    }
    history.clear();
    modifiedState =  undoState = 0;
    cursor = (pos < 0 || pos > text.length()) ? text.length() : pos;
    textDirty = (oldText != text);
    finishChange(-1, true, edited);
}


void QLineEditPrivate::setCursorVisible(bool visible)
{
    Q_Q(QLineEdit);
    if ((bool)cursorVisible == visible)
        return;
    if (cursorTimer)
        cursorVisible = visible;
    QRect r = cursorRect();
    if (maskData)
        q->update();
    else
        q->update(r);
}

void QLineEditPrivate::addCommand(const Command& cmd)
{
    if (separator && undoState && history[undoState-1].type != Separator) {
        history.resize(undoState + 2);
        history[undoState++] = Command(Separator, 0, 0);
    } else {
        history.resize(undoState + 1);
    }
    separator = false;
    history[undoState++] = cmd;
}

void QLineEditPrivate::insert(const QString& s)
{
    if (maskData) {
        QString ms = maskString(cursor, s);
        for (int i = 0; i < (int) ms.length(); ++i) {
            addCommand (Command(DeleteSelection, cursor+i, text.at(cursor+i)));
            addCommand(Command(Insert, cursor+i, ms.at(i)));
        }
        text.replace(cursor, ms.length(), ms);
        cursor += ms.length();
        cursor = nextMaskBlank(cursor);
    } else {
        int remaining = maxLength - text.length();
        text.insert(cursor, s.left(remaining));
        for (int i = 0; i < (int) s.left(remaining).length(); ++i)
            addCommand(Command(Insert, cursor++, s.at(i)));
    }
    textDirty = true;
}

void QLineEditPrivate::del(bool wasBackspace)
{
    if (cursor < (int) text.length()) {
        addCommand (Command((CommandType)((maskData?2:0)+(wasBackspace?Remove:Delete)), cursor, text.at(cursor)));
        if (maskData) {
            text.replace(cursor, 1, clearString(cursor, 1));
            addCommand(Command(Insert, cursor, text.at(cursor)));
        } else {
            text.remove(cursor, 1);
        }
        textDirty = true;
    }
}

void QLineEditPrivate::removeSelectedText()
{
    if (selstart < selend && selend <= (int) text.length()) {
        separate();
        int i ;
        if (selstart <= cursor && cursor < selend) {
            // cursor is within the selection. Split up the commands
            // to be able to restore the correct cursor position
            for (i = cursor; i >= selstart; --i)
                addCommand (Command(DeleteSelection, i, text.at(i)));
            for (i = selend - 1; i > cursor; --i)
                addCommand (Command(DeleteSelection, i - cursor + selstart - 1, text.at(i)));
        } else {
            for (i = selend-1; i >= selstart; --i)
                addCommand (Command(RemoveSelection, i, text.at(i)));
        }
        if (maskData) {
            text.replace(selstart, selend - selstart,  clearString(selstart, selend - selstart));
            for (int i = 0; i < selend - selstart; ++i)
                addCommand(Command(Insert, selstart + i, text.at(selstart + i)));
        } else {
            text.remove(selstart, selend - selstart);
        }
        if (cursor > selstart)
            cursor -= qMin(cursor, selend) - selstart;
        deselect();
        textDirty = true;
    }
}

void QLineEditPrivate::parseInputMask(const QString &maskFields)
{
    int delimiter = maskFields.indexOf(QLatin1Char(';'));
    if (maskFields.isEmpty() || delimiter == 0) {
        if (maskData) {
            delete [] maskData;
            maskData = 0;
            maxLength = 32767;
            setText(QString());
        }
        return;
    }

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

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

    delete [] maskData;
    maskData = new MaskInputData[maxLength];

    MaskInputData::Casemode m = MaskInputData::NoCaseMode;
    c = 0;
    bool s;
    bool escape = false;
    int index = 0;
    for (int i = 0; i < inputMask.length(); i++) {
        c = inputMask.at(i);
        if (escape) {
            s = true;
            maskData[index].maskChar = c;
            maskData[index].separator = s;
            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) {
                maskData[index].maskChar = c;
                maskData[index].separator = s;
                maskData[index].caseMode = m;
                index++;
            }
        }
    }
    setText(text);
}


/* checks if the key is valid compared to the inputMask */
bool QLineEditPrivate::isValidInput(QChar key, QChar mask) const
{
    switch (mask.unicode()) {
    case 'A':
        if (key.isLetter())
            return true;
        break;
    case 'a':
        if (key.isLetter() || key == blank)
            return true;
        break;
    case 'N':
        if (key.isLetterOrNumber())
            return true;
        break;
    case 'n':
        if (key.isLetterOrNumber() || key == blank)
            return true;
        break;
    case 'X':
        if (key.isPrint())
            return true;
        break;
    case 'x':
        if (key.isPrint() || key == blank)
            return true;
        break;
    case '9':
        if (key.isNumber())
            return true;
        break;
    case '0':
        if (key.isNumber() || key == blank)
            return true;
        break;
    case 'D':
        if (key.isNumber() && key.digitValue() > 0)
            return true;
        break;
    case 'd':
        if ((key.isNumber() && key.digitValue() > 0) || key == blank)
            return true;
        break;
    case '#':
        if (key.isNumber() || key == QLatin1Char('+') || key == QLatin1Char('-') || key == 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 == 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 == blank)
            return true;
        break;
    default:
        break;
    }
    return false;
}

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

    if (!maskData)
        return true;

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

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

/*
  Applies the inputMask on \a str starting from position \a pos in the mask. \a clear
  specifies from where characters should be gotten when a separator is met in \a str - true means
  that blanks will be used, false that previous input is used.
  Calling this when no inputMask is set is undefined.
*/
QString QLineEditPrivate::maskString(uint pos, const QString &str, bool clear) const
{
    if (pos >= (uint)maxLength)
        return QString::fromLatin1("");

    QString fill;
    fill = clear ? clearString(0, maxLength) : text;

    int strIndex = 0;
    QString s = QString::fromLatin1("");
    int i = pos;
    while (i < maxLength) {
        if (strIndex < str.length()) {
            if (maskData[i].separator) {
                s += maskData[i].maskChar;
                if (str[(int)strIndex] == maskData[i].maskChar)
                    strIndex++;
                ++i;
            } else {
                if (isValidInput(str[(int)strIndex], maskData[i].maskChar)) {
                    switch (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 && (!maskData[i-1].separator || 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 blank if not
                        n = findInMask(i, true, false, str[(int)strIndex]);
                        if (n != -1) {
                            s += fill.mid(i, n-i);
                            switch (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;
}



/*
  Returns a "cleared" string with only separators and blank chars.
  Calling this when no inputMask is set is undefined.
*/
QString QLineEditPrivate::clearString(uint pos, uint len) const
{
    if (pos >= (uint)maxLength)
        return QString();

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

    return s;
}

/*
  Strips blank parts of the input in a QLineEdit when an inputMask is set,
  separators are still included. Typically "127.0__.0__.1__" becomes "127.0.0.1".
*/
QString QLineEditPrivate::stripString(const QString &str) const
{
    if (!maskData)
        return str;

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

    return s;
}

/* searches forward/backward in maskData for either a separator or a blank */
int QLineEditPrivate::findInMask(int pos, bool forward, bool findSeparator, QChar searchChar) const
{
    if (pos >= maxLength || pos < 0)
        return -1;

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

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

void QLineEditPrivate::undo(int until)
{
    if (!isUndoAvailable())
        return;
    deselect();
    while (undoState && undoState > until) {
        Command& cmd = history[--undoState];
        switch (cmd.type) {
        case Insert:
            text.remove(cmd.pos, 1);
            cursor = cmd.pos;
            break;
        case Remove:
        case RemoveSelection:
            text.insert(cmd.pos, cmd.uc);
            cursor = cmd.pos + 1;
            break;
        case Delete:
        case DeleteSelection:
            text.insert(cmd.pos, cmd.uc);
            cursor = cmd.pos;
            break;
        case Separator:
            continue;
        }
        if (until < 0 && undoState) {
            Command& next = history[undoState-1];
            if (next.type != cmd.type && next.type < RemoveSelection
                 && !(cmd.type >= RemoveSelection && next.type != Separator))
                break;
        }
    }
    textDirty = true;
    emitCursorPositionChanged();
}

void QLineEditPrivate::redo() {
    if (!isRedoAvailable())
        return;
    deselect();
    while (undoState < (int)history.size()) {
        Command& cmd = history[undoState++];
        switch (cmd.type) {
        case Insert:
            text.insert(cmd.pos, cmd.uc);
            cursor = cmd.pos + 1;
            break;
        case Remove:
        case Delete:
        case RemoveSelection:
        case DeleteSelection:
            text.remove(cmd.pos, 1);
            cursor = cmd.pos;
            break;
        case Separator:
            continue;
        }
        if (undoState < (int)history.size()) {
            Command& next = history[undoState];
            if (next.type != cmd.type && cmd.type < RemoveSelection
                 && !(next.type >= RemoveSelection && cmd.type != Separator))
                break;
        }
    }
    textDirty = true;
    emitCursorPositionChanged();
}

#include "moc_qlineedit.cpp"

#endif // QT_NO_LINEEDIT

---