source: trunk/src/gui/dialogs/qwizard.cpp@ 561

/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation ([email protected])
**
** This file is part of the QtGui module of the Qt Toolkit.
**
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** accordance with the Qt Commercial License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Nokia.
**
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** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
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** rights.  These rights are described in the Nokia Qt LGPL Exception
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**
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** General Public License version 3.0 as published by the Free Software
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** packaging of this file.  Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
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**
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#include "qwizard.h"

#ifndef QT_NO_WIZARD

#include "qabstractspinbox.h"
#include "qalgorithms.h"
#include "qapplication.h"
#include "qboxlayout.h"
#include "qlayoutitem.h"
#include "qdesktopwidget.h"
#include "qevent.h"
#include "qframe.h"
#include "qlabel.h"
#include "qlineedit.h"
#include "qpainter.h"
#include "qpushbutton.h"
#include "qset.h"
#include "qstyle.h"
#include "qvarlengtharray.h"
#if defined(Q_WS_MAC)
#include "private/qt_mac_p.h"
#include "qlibrary.h"
#elif !defined(QT_NO_STYLE_WINDOWSVISTA)
#include "qwizard_win_p.h"
#include "qtimer.h"
#endif

#include "private/qdialog_p.h"
#include <qdebug.h>

#ifdef Q_WS_WINCE
extern bool qt_wince_is_mobile();     //defined in qguifunctions_wce.cpp
#endif

#include <string.h>     // for memset()

#ifdef QT_SOFTKEYS_ENABLED
#include "qaction.h"
#endif

QT_BEGIN_NAMESPACE

// These fudge terms were needed a few places to obtain pixel-perfect results
const int GapBetweenLogoAndRightEdge = 5;
const int ModernHeaderTopMargin = 2;
const int ClassicHMargin = 4;
const int MacButtonTopMargin = 13;
const int MacLayoutLeftMargin = 20;
//const int MacLayoutTopMargin = 14; // Unused. Save some space and avoid warning.
const int MacLayoutRightMargin = 20;
const int MacLayoutBottomMargin = 17;

static void changeSpacerSize(QLayout *layout, int index, int width, int height)
{
    QSpacerItem *spacer = layout->itemAt(index)->spacerItem();
    if (!spacer)
        return;
    spacer->changeSize(width, height);
}

static QWidget *iWantTheFocus(QWidget *ancestor)
{
    const int MaxIterations = 100;

    QWidget *candidate = ancestor;
    for (int i = 0; i < MaxIterations; ++i) {
        candidate = candidate->nextInFocusChain();
        if (!candidate)
            break;

        if (candidate->focusPolicy() & Qt::TabFocus) {
            if (candidate != ancestor && ancestor->isAncestorOf(candidate))
                return candidate;
        }
    }
    return 0;
}

static bool objectInheritsXAndXIsCloserThanY(const QObject *object, const QByteArray &classX,
                                             const QByteArray &classY)
{
    const QMetaObject *metaObject = object->metaObject();
    while (metaObject) {
        if (metaObject->className() == classX)
            return true;
        if (metaObject->className() == classY)
            return false;
        metaObject = metaObject->superClass();
    }
    return false;
}

const int NFallbackDefaultProperties = 7;

const struct {
    const char *className;
    const char *property;
    const char *changedSignal;
} fallbackProperties[NFallbackDefaultProperties] = {
    // If you modify this list, make sure to update the documentation (and the auto test)
    { "QAbstractButton", "checked", SIGNAL(toggled(bool)) },
    { "QAbstractSlider", "value", SIGNAL(valueChanged(int)) },
    { "QComboBox", "currentIndex", SIGNAL(currentIndexChanged(int)) },
    { "QDateTimeEdit", "dateTime", SIGNAL(dateTimeChanged(QDateTime)) },
    { "QLineEdit", "text", SIGNAL(textChanged(QString)) },
    { "QListWidget", "currentRow", SIGNAL(currentRowChanged(int)) },
    { "QSpinBox", "value", SIGNAL(valueChanged(int)) }
};

class QWizardDefaultProperty
{
public:
    QByteArray className;
    QByteArray property;
    QByteArray changedSignal;

    inline QWizardDefaultProperty() {}
    inline QWizardDefaultProperty(const char *className, const char *property,
                                   const char *changedSignal)
        : className(className), property(property), changedSignal(changedSignal) {}
};

class QWizardField
{
public:
    inline QWizardField() {}
    QWizardField(QWizardPage *page, const QString &spec, QObject *object, const char *property,
                  const char *changedSignal);

    void resolve(const QVector<QWizardDefaultProperty> &defaultPropertyTable);
    void findProperty(const QWizardDefaultProperty *properties, int propertyCount);

    QWizardPage *page;
    QString name;
    bool mandatory;
    QObject *object;
    QByteArray property;
    QByteArray changedSignal;
    QVariant initialValue;
};

QWizardField::QWizardField(QWizardPage *page, const QString &spec, QObject *object,
                           const char *property, const char *changedSignal)
    : page(page), name(spec), mandatory(false), object(object), property(property),
      changedSignal(changedSignal)
{
    if (name.endsWith(QLatin1Char('*'))) {
        name.chop(1);
        mandatory = true;
    }
}

void QWizardField::resolve(const QVector<QWizardDefaultProperty> &defaultPropertyTable)
{
    if (property.isEmpty())
        findProperty(defaultPropertyTable.constData(), defaultPropertyTable.count());
    initialValue = object->property(property);
}

void QWizardField::findProperty(const QWizardDefaultProperty *properties, int propertyCount)
{
    QByteArray className;

    for (int i = 0; i < propertyCount; ++i) {
        if (objectInheritsXAndXIsCloserThanY(object, properties[i].className, className)) {
            className = properties[i].className;
            property = properties[i].property;
            changedSignal = properties[i].changedSignal;
        }
    }
}

class QWizardLayoutInfo
{
public:
    inline QWizardLayoutInfo()
    : topLevelMarginLeft(-1), topLevelMarginRight(-1), topLevelMarginTop(-1),
      topLevelMarginBottom(-1), childMarginLeft(-1), childMarginRight(-1),
      childMarginTop(-1), childMarginBottom(-1), hspacing(-1), vspacing(-1),
          wizStyle(QWizard::ClassicStyle), header(false), watermark(false), title(false),
          subTitle(false), extension(false) {}

    int topLevelMarginLeft;
    int topLevelMarginRight;
    int topLevelMarginTop;
    int topLevelMarginBottom;
    int childMarginLeft;
    int childMarginRight;
    int childMarginTop;
    int childMarginBottom;
    int hspacing;
    int vspacing;
    int buttonSpacing;
    QWizard::WizardStyle wizStyle;
    bool header;
    bool watermark;
    bool title;
    bool subTitle;
    bool extension;

    bool operator==(const QWizardLayoutInfo &other);
    inline bool operator!=(const QWizardLayoutInfo &other) { return !operator==(other); }
};

bool QWizardLayoutInfo::operator==(const QWizardLayoutInfo &other)
{
    return topLevelMarginLeft == other.topLevelMarginLeft
           && topLevelMarginRight == other.topLevelMarginRight
           && topLevelMarginTop == other.topLevelMarginTop
           && topLevelMarginBottom == other.topLevelMarginBottom
           && childMarginLeft == other.childMarginLeft
           && childMarginRight == other.childMarginRight
           && childMarginTop == other.childMarginTop
           && childMarginBottom == other.childMarginBottom
           && hspacing == other.hspacing
           && vspacing == other.vspacing
           && buttonSpacing == other.buttonSpacing
           && wizStyle == other.wizStyle
           && header == other.header
           && watermark == other.watermark
           && title == other.title
           && subTitle == other.subTitle
           && extension == other.extension;
}

class QWizardHeader : public QWidget
{
public:
    enum RulerType { Ruler };

    inline QWizardHeader(RulerType /* ruler */, QWidget *parent = 0)
        : QWidget(parent) { setFixedHeight(2); }
    QWizardHeader(QWidget *parent = 0);

    void setup(const QWizardLayoutInfo &info, const QString &title,
               const QString &subTitle, const QPixmap &logo, const QPixmap &banner,
               Qt::TextFormat titleFormat, Qt::TextFormat subTitleFormat);

protected:
    void paintEvent(QPaintEvent *event);
#if !defined(QT_NO_STYLE_WINDOWSVISTA)
private:
    bool vistaDisabled() const;
#endif
private:
    QLabel *titleLabel;
    QLabel *subTitleLabel;
    QLabel *logoLabel;
    QGridLayout *layout;
    QPixmap bannerPixmap;
};

QWizardHeader::QWizardHeader(QWidget *parent)
    : QWidget(parent)
{
    setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Fixed);
    setBackgroundRole(QPalette::Base);

    titleLabel = new QLabel(this);
    titleLabel->setBackgroundRole(QPalette::Base);

    subTitleLabel = new QLabel(this);
    subTitleLabel->setAlignment(Qt::AlignTop | Qt::AlignLeft);
    subTitleLabel->setWordWrap(true);

    logoLabel = new QLabel(this);

    QFont font = titleLabel->font();
    font.setBold(true);
    titleLabel->setFont(font);

    layout = new QGridLayout(this);
    layout->setMargin(0);
    layout->setSpacing(0);

    layout->setRowMinimumHeight(3, 1);
    layout->setRowStretch(4, 1);

    layout->setColumnStretch(2, 1);
    layout->setColumnMinimumWidth(4, 2 * GapBetweenLogoAndRightEdge);
    layout->setColumnMinimumWidth(6, GapBetweenLogoAndRightEdge);

    layout->addWidget(titleLabel, 2, 1, 1, 2);
    layout->addWidget(subTitleLabel, 4, 2);
    layout->addWidget(logoLabel, 1, 5, 5, 1);
}

#if !defined(QT_NO_STYLE_WINDOWSVISTA)
bool QWizardHeader::vistaDisabled() const
{
    bool styleDisabled = false;
    QWizard *wiz = parentWidget() ? qobject_cast <QWizard *>(parentWidget()->parentWidget()) : 0;
    if (wiz) {
        // Designer dosen't support the Vista style for Wizards. This property is used to turn
        // off the Vista style.
        const QVariant v = wiz->property("_q_wizard_vista_off");
        styleDisabled = v.isValid() && v.toBool();
    }
    return styleDisabled;
}
#endif

void QWizardHeader::setup(const QWizardLayoutInfo &info, const QString &title,
                          const QString &subTitle, const QPixmap &logo, const QPixmap &banner,
                          Qt::TextFormat titleFormat, Qt::TextFormat subTitleFormat)
{
    bool modern = ((info.wizStyle == QWizard::ModernStyle)
#if !defined(QT_NO_STYLE_WINDOWSVISTA)
        || ((info.wizStyle == QWizard::AeroStyle
            && QVistaHelper::vistaState() == QVistaHelper::Classic) || vistaDisabled())
#endif
    );

    layout->setRowMinimumHeight(0, modern ? ModernHeaderTopMargin : 0);
    layout->setRowMinimumHeight(1, modern ? info.topLevelMarginTop - ModernHeaderTopMargin - 1 : 0);
    layout->setRowMinimumHeight(6, (modern ? 3 : GapBetweenLogoAndRightEdge) + 2);

    int minColumnWidth0 = modern ? info.topLevelMarginLeft + info.topLevelMarginRight : 0;
    int minColumnWidth1 = modern ? info.topLevelMarginLeft + info.topLevelMarginRight + 1
                                 : info.topLevelMarginLeft + ClassicHMargin;
    layout->setColumnMinimumWidth(0, minColumnWidth0);
    layout->setColumnMinimumWidth(1, minColumnWidth1);

    titleLabel->setTextFormat(titleFormat);
    titleLabel->setText(title);
    logoLabel->setPixmap(logo);

    subTitleLabel->setTextFormat(subTitleFormat);
    subTitleLabel->setText(QLatin1String("Pq\nPq"));
    int desiredSubTitleHeight = subTitleLabel->sizeHint().height();
    subTitleLabel->setText(subTitle);

    if (modern) {
        bannerPixmap = banner;
    } else {
        bannerPixmap = QPixmap();
    }

    if (bannerPixmap.isNull()) {
        /*
            There is no widthForHeight() function, so we simulate it with a loop.
        */
        int candidateSubTitleWidth = qMin(512, 2 * QApplication::desktop()->width() / 3);
        int delta = candidateSubTitleWidth >> 1;
        while (delta > 0) {
            if (subTitleLabel->heightForWidth(candidateSubTitleWidth - delta)
                        <= desiredSubTitleHeight)
                candidateSubTitleWidth -= delta;
            delta >>= 1;
        }

        subTitleLabel->setMinimumSize(candidateSubTitleWidth, desiredSubTitleHeight);

        QSize size = layout->totalMinimumSize();
        setMinimumSize(size);
        setMaximumSize(QWIDGETSIZE_MAX, size.height());
    } else {
        subTitleLabel->setMinimumSize(0, 0);
        setFixedSize(banner.size() + QSize(0, 2));
    }
    updateGeometry();
}

void QWizardHeader::paintEvent(QPaintEvent * /* event */)
{
    QPainter painter(this);
    painter.drawPixmap(0, 0, bannerPixmap);

    int x = width() - 2;
    int y = height() - 2;
    const QPalette &pal = palette();
    painter.setPen(pal.mid().color());
    painter.drawLine(0, y, x, y);
    painter.setPen(pal.base().color());
    painter.drawPoint(x + 1, y);
    painter.drawLine(0, y + 1, x + 1, y + 1);
}

// We save one vtable by basing QWizardRuler on QWizardHeader
class QWizardRuler : public QWizardHeader
{
public:
    inline QWizardRuler(QWidget *parent = 0)
        : QWizardHeader(Ruler, parent) {}
};

class QWizardPagePrivate : public QWidgetPrivate
{
    Q_DECLARE_PUBLIC(QWizardPage)

public:
    enum TriState { Tri_Unknown = -1, Tri_False, Tri_True };

    inline QWizardPagePrivate()
        : wizard(0), completeState(Tri_Unknown), explicitlyFinal(false), commit(false) {}

    bool cachedIsComplete() const;
    void _q_maybeEmitCompleteChanged();
    void _q_updateCachedCompleteState();

    QWizard *wizard;
    QString title;
    QString subTitle;
    QPixmap pixmaps[QWizard::NPixmaps];
    QVector<QWizardField> pendingFields;
    mutable TriState completeState;
    bool explicitlyFinal;
    bool commit;
    QMap<int, QString> buttonCustomTexts;
};

bool QWizardPagePrivate::cachedIsComplete() const
{
    Q_Q(const QWizardPage);
    if (completeState == Tri_Unknown)
        completeState = q->isComplete() ? Tri_True : Tri_False;
    return completeState == Tri_True;
}

void QWizardPagePrivate::_q_maybeEmitCompleteChanged()
{
    Q_Q(QWizardPage);
    TriState newState = q->isComplete() ? Tri_True : Tri_False;
    if (newState != completeState)
        emit q->completeChanged();
}

void QWizardPagePrivate::_q_updateCachedCompleteState()
{
    Q_Q(QWizardPage);
    completeState = q->isComplete() ? Tri_True : Tri_False;
}

class QWizardAntiFlickerWidget : public QWidget
{
    QWizard *wizard;
    QWizardPrivate *wizardPrivate;
public:
    QWizardAntiFlickerWidget(QWizard *wizard, QWizardPrivate *wizardPrivate)
        : QWidget(wizard)
        , wizard(wizard)
        , wizardPrivate(wizardPrivate) {}
#if !defined(QT_NO_STYLE_WINDOWSVISTA)
protected:
    void paintEvent(QPaintEvent *);
#endif
};

class QWizardPrivate : public QDialogPrivate
{
    Q_DECLARE_PUBLIC(QWizard)

public:
    typedef QMap<int, QWizardPage *> PageMap;

    enum Direction {
        Backward,
        Forward
    };

    inline QWizardPrivate()
        : start(-1)
        , current(-1)
        , canContinue(false)
        , canFinish(false)
        , disableUpdatesCount(0)
        , opts(0)
        , buttonsHaveCustomLayout(false)
        , titleFmt(Qt::AutoText)
        , subTitleFmt(Qt::AutoText)
        , placeholderWidget1(0)
        , placeholderWidget2(0)
        , headerWidget(0)
        , watermarkLabel(0)
        , titleLabel(0)
        , subTitleLabel(0)
        , bottomRuler(0)
#if !defined(QT_NO_STYLE_WINDOWSVISTA)
        , vistaInitPending(false)
        , vistaState(QVistaHelper::Dirty)
        , vistaStateChanged(false)
        , inHandleAeroStyleChange(false)
#endif
        , minimumWidth(0)
        , minimumHeight(0)
        , maximumWidth(QWIDGETSIZE_MAX)
        , maximumHeight(QWIDGETSIZE_MAX)
    {
        for (int i = 0; i < QWizard::NButtons; ++i) {
            btns[i] = 0;
#ifdef QT_SOFTKEYS_ENABLED
            softKeys[i] = 0;
#endif
        }
#if !defined(QT_NO_STYLE_WINDOWSVISTA)
        if (QSysInfo::WindowsVersion >= QSysInfo::WV_VISTA
            && QSysInfo::WindowsVersion < QSysInfo::WV_NT_based)
            vistaInitPending = true;
#endif
    }

    void init();
    void reset();
    void cleanupPagesNotInHistory();
    void addField(const QWizardField &field);
    void removeFieldAt(int index);
    void switchToPage(int newId, Direction direction);
    QWizardLayoutInfo layoutInfoForCurrentPage();
    void recreateLayout(const QWizardLayoutInfo &info);
    void updateLayout();
    void updateMinMaxSizes(const QWizardLayoutInfo &info);
    void updateCurrentPage();
    bool ensureButton(QWizard::WizardButton which) const;
    void connectButton(QWizard::WizardButton which) const;
    void updateButtonTexts();
    void updateButtonLayout();
    void setButtonLayout(const QWizard::WizardButton *array, int size);
    bool buttonLayoutContains(QWizard::WizardButton which);
    void updatePixmap(QWizard::WizardPixmap which);
#if !defined(QT_NO_STYLE_WINDOWSVISTA)
    bool vistaDisabled() const;
    bool isVistaThemeEnabled(QVistaHelper::VistaState state) const;
    void handleAeroStyleChange();
#endif
    bool isVistaThemeEnabled() const;
    void disableUpdates();
    void enableUpdates();
    void _q_emitCustomButtonClicked();
    void _q_updateButtonStates();
    void _q_handleFieldObjectDestroyed(QObject *);
    void setStyle(QStyle *style);
#ifdef Q_WS_MAC
    static QPixmap findDefaultBackgroundPixmap();
#endif

    PageMap pageMap;
    QVector<QWizardField> fields;
    QMap<QString, int> fieldIndexMap;
    QVector<QWizardDefaultProperty> defaultPropertyTable;
    QList<int> history;
    QSet<int> initialized; // ### remove and move bit to QWizardPage?
    int start;
    int current;
    bool canContinue;
    bool canFinish;
    QWizardLayoutInfo layoutInfo;
    int disableUpdatesCount;

    QWizard::WizardStyle wizStyle;
    QWizard::WizardOptions opts;
    QMap<int, QString> buttonCustomTexts;
    bool buttonsHaveCustomLayout;
    QList<QWizard::WizardButton> buttonsCustomLayout;
    Qt::TextFormat titleFmt;
    Qt::TextFormat subTitleFmt;
    mutable QPixmap defaultPixmaps[QWizard::NPixmaps];

    union {
        // keep in sync with QWizard::WizardButton
        mutable struct {
            QAbstractButton *back;
            QAbstractButton *next;
            QAbstractButton *commit;
            QAbstractButton *finish;
            QAbstractButton *cancel;
            QAbstractButton *help;
        } btn;
        mutable QAbstractButton *btns[QWizard::NButtons];
    };
    QWizardAntiFlickerWidget *antiFlickerWidget;
    QWidget *placeholderWidget1;
    QWidget *placeholderWidget2;
    QWizardHeader *headerWidget;
    QLabel *watermarkLabel;
    QFrame *pageFrame;
    QLabel *titleLabel;
    QLabel *subTitleLabel;
    QWizardRuler *bottomRuler;
#ifdef QT_SOFTKEYS_ENABLED
    mutable QAction *softKeys[QWizard::NButtons];
#endif

    QVBoxLayout *pageVBoxLayout;
    QHBoxLayout *buttonLayout;
    QGridLayout *mainLayout;

#if !defined(QT_NO_STYLE_WINDOWSVISTA)
    QVistaHelper *vistaHelper;
    bool vistaInitPending;
    QVistaHelper::VistaState vistaState;
    bool vistaStateChanged;
    bool inHandleAeroStyleChange;
#endif
    int minimumWidth;
    int minimumHeight;
    int maximumWidth;
    int maximumHeight;
};

static QString buttonDefaultText(int wstyle, int which, const QWizardPrivate *wizardPrivate)
{
#if defined(QT_NO_STYLE_WINDOWSVISTA)
    Q_UNUSED(wizardPrivate);
#endif
    const bool macStyle = (wstyle == QWizard::MacStyle);
    switch (which) {
    case QWizard::BackButton:
        return macStyle ? QWizard::tr("Go Back") : QWizard::tr("< &Back");
    case QWizard::NextButton:
        if (macStyle)
            return QWizard::tr("Continue");
        else
            return wizardPrivate->isVistaThemeEnabled()
                ? QWizard::tr("&Next") : QWizard::tr("&Next >");
    case QWizard::CommitButton:
        return QWizard::tr("Commit");
    case QWizard::FinishButton:
        return macStyle ? QWizard::tr("Done") : QWizard::tr("&Finish");
    case QWizard::CancelButton:
        return QWizard::tr("Cancel");
    case QWizard::HelpButton:
        return macStyle ? QWizard::tr("Help") : QWizard::tr("&Help");
    default:
        return QString();
    }
}

void QWizardPrivate::init()
{
    Q_Q(QWizard);

    antiFlickerWidget = new QWizardAntiFlickerWidget(q, this);
    wizStyle = QWizard::WizardStyle(q->style()->styleHint(QStyle::SH_WizardStyle, 0, q));
    if (wizStyle == QWizard::MacStyle) {
        opts = (QWizard::NoDefaultButton | QWizard::NoCancelButton);
    } else if (wizStyle == QWizard::ModernStyle) {
        opts = QWizard::HelpButtonOnRight;
    }

#if !defined(QT_NO_STYLE_WINDOWSVISTA)
    vistaHelper = new QVistaHelper(q);
#endif

    // create these buttons right away; create the other buttons as necessary
    ensureButton(QWizard::BackButton);
    ensureButton(QWizard::NextButton);
    ensureButton(QWizard::CommitButton);
    ensureButton(QWizard::FinishButton);

    pageFrame = new QFrame(antiFlickerWidget);
    pageFrame->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Preferred);

    pageVBoxLayout = new QVBoxLayout(pageFrame);
    pageVBoxLayout->setSpacing(0);
    pageVBoxLayout->addSpacing(0);
    QSpacerItem *spacerItem = new QSpacerItem(0, 0, QSizePolicy::Ignored, QSizePolicy::MinimumExpanding);
    pageVBoxLayout->addItem(spacerItem);

    buttonLayout = new QHBoxLayout;
    mainLayout = new QGridLayout(antiFlickerWidget);
    mainLayout->setSizeConstraint(QLayout::SetNoConstraint);

    updateButtonLayout();

    for (int i = 0; i < NFallbackDefaultProperties; ++i)
        defaultPropertyTable.append(QWizardDefaultProperty(fallbackProperties[i].className,
                                                           fallbackProperties[i].property,
                                                           fallbackProperties[i].changedSignal));
}

void QWizardPrivate::reset()
{
    Q_Q(QWizard);
    if (current != -1) {
        q->currentPage()->hide();
        cleanupPagesNotInHistory();
        for (int i = history.count() - 1; i >= 0; --i)
            q->cleanupPage(history.at(i));
        history.clear();
        initialized.clear();

        current = -1;
        emit q->currentIdChanged(-1);
    }
}

void QWizardPrivate::cleanupPagesNotInHistory()
{
    Q_Q(QWizard);

    const QSet<int> original = initialized;
    QSet<int>::const_iterator i = original.constBegin();
    QSet<int>::const_iterator end = original.constEnd();

    for (; i != end; ++i) {
        if (!history.contains(*i)) {
            q->cleanupPage(*i);
            initialized.remove(*i);
        }
    }
}

void QWizardPrivate::addField(const QWizardField &field)
{
    Q_Q(QWizard);

    QWizardField myField = field;
    myField.resolve(defaultPropertyTable);

    if (fieldIndexMap.contains(myField.name)) {
        qWarning("QWizardPage::addField: Duplicate field '%s'", qPrintable(myField.name));
        return;
    }

    fieldIndexMap.insert(myField.name, fields.count());
    fields += myField;
    if (myField.mandatory && !myField.changedSignal.isEmpty())
        QObject::connect(myField.object, myField.changedSignal,
                         myField.page, SLOT(_q_maybeEmitCompleteChanged()));
    QObject::connect(
        myField.object, SIGNAL(destroyed(QObject*)), q,
        SLOT(_q_handleFieldObjectDestroyed(QObject*)));
}

void QWizardPrivate::removeFieldAt(int index)
{
    Q_Q(QWizard);

    const QWizardField &field = fields.at(index);
    fieldIndexMap.remove(field.name);
    if (field.mandatory && !field.changedSignal.isEmpty())
        QObject::disconnect(field.object, field.changedSignal,
                            field.page, SLOT(_q_maybeEmitCompleteChanged()));
    QObject::disconnect(
        field.object, SIGNAL(destroyed(QObject*)), q,
        SLOT(_q_handleFieldObjectDestroyed(QObject*)));
    fields.remove(index);
}

void QWizardPrivate::switchToPage(int newId, Direction direction)
{
    Q_Q(QWizard);

    disableUpdates();

    int oldId = current;
    if (QWizardPage *oldPage = q->currentPage()) {
        oldPage->hide();

        if (direction == Backward) {
            if (!(opts & QWizard::IndependentPages)) {
                q->cleanupPage(oldId);
                initialized.remove(oldId);
            }
            Q_ASSERT(history.last() == oldId);
            history.removeLast();
            Q_ASSERT(history.last() == newId);
        }
    }

    current = newId;

    QWizardPage *newPage = q->currentPage();
    if (newPage) {
        if (direction == Forward) {
            if (!initialized.contains(current)) {
                initialized.insert(current);
                q->initializePage(current);
            }
            history.append(current);
        }
        newPage->show();
    }

    canContinue = (q->nextId() != -1);
    canFinish = (newPage && newPage->isFinalPage());

    _q_updateButtonStates();
    updateButtonTexts();

    const QWizard::WizardButton nextOrCommit =
        newPage && newPage->isCommitPage() ? QWizard::CommitButton : QWizard::NextButton;
    QAbstractButton *nextOrFinishButton =
        btns[canContinue ? nextOrCommit : QWizard::FinishButton];
    QWidget *candidate = 0;

    /*
        If there is no default button and the Next or Finish button
        is enabled, give focus directly to it as a convenience to the
        user. This is the normal case on Mac OS X.

        Otherwise, give the focus to the new page's first child that
        can handle it. If there is no such child, give the focus to
        Next or Finish.
    */
    if ((opts & QWizard::NoDefaultButton) && nextOrFinishButton->isEnabled()) {
        candidate = nextOrFinishButton;
    } else if (newPage) {
        candidate = iWantTheFocus(newPage);
    }
    if (!candidate)
        candidate = nextOrFinishButton;
    candidate->setFocus();

    if (wizStyle == QWizard::MacStyle)
        q->updateGeometry();

    enableUpdates();
    updateLayout();

    emit q->currentIdChanged(current);
}

// keep in sync with QWizard::WizardButton
static const char * const buttonSlots[QWizard::NStandardButtons] = {
    SLOT(back()), SLOT(next()), SLOT(next()), SLOT(accept()), SLOT(reject()),
    SIGNAL(helpRequested())
};

QWizardLayoutInfo QWizardPrivate::layoutInfoForCurrentPage()
{
    Q_Q(QWizard);
    QStyle *style = q->style();

    QWizardLayoutInfo info;

    const int layoutHorizontalSpacing = style->pixelMetric(QStyle::PM_LayoutHorizontalSpacing);
    info.topLevelMarginLeft = style->pixelMetric(QStyle::PM_LayoutLeftMargin, 0, q);
    info.topLevelMarginRight = style->pixelMetric(QStyle::PM_LayoutRightMargin, 0, q);
    info.topLevelMarginTop = style->pixelMetric(QStyle::PM_LayoutTopMargin, 0, q);
    info.topLevelMarginBottom = style->pixelMetric(QStyle::PM_LayoutBottomMargin, 0, q);
    info.childMarginLeft = style->pixelMetric(QStyle::PM_LayoutLeftMargin, 0, titleLabel);
    info.childMarginRight = style->pixelMetric(QStyle::PM_LayoutRightMargin, 0, titleLabel);
    info.childMarginTop = style->pixelMetric(QStyle::PM_LayoutTopMargin, 0, titleLabel);
    info.childMarginBottom = style->pixelMetric(QStyle::PM_LayoutBottomMargin, 0, titleLabel);
    info.hspacing = (layoutHorizontalSpacing == -1)
        ? style->layoutSpacing(QSizePolicy::DefaultType, QSizePolicy::DefaultType, Qt::Horizontal)
        : layoutHorizontalSpacing;
    info.vspacing = style->pixelMetric(QStyle::PM_LayoutVerticalSpacing);
    info.buttonSpacing = (layoutHorizontalSpacing == -1)
        ? style->layoutSpacing(QSizePolicy::PushButton, QSizePolicy::PushButton, Qt::Horizontal)
        : layoutHorizontalSpacing;

    if (wizStyle == QWizard::MacStyle)
        info.buttonSpacing = 12;

    info.wizStyle = wizStyle;
    if ((info.wizStyle == QWizard::AeroStyle)
#if !defined(QT_NO_STYLE_WINDOWSVISTA)
        && (QVistaHelper::vistaState() == QVistaHelper::Classic || vistaDisabled())
#endif
        )
        info.wizStyle = QWizard::ModernStyle;

    QString titleText;
    QString subTitleText;
    QPixmap backgroundPixmap;
    QPixmap watermarkPixmap;

    if (QWizardPage *page = q->currentPage()) {
        titleText = page->title();
        subTitleText = page->subTitle();
        backgroundPixmap = page->pixmap(QWizard::BackgroundPixmap);
        watermarkPixmap = page->pixmap(QWizard::WatermarkPixmap);
    }

    info.header = (info.wizStyle == QWizard::ClassicStyle || info.wizStyle == QWizard::ModernStyle)
        && !(opts & QWizard::IgnoreSubTitles) && !subTitleText.isEmpty();
    info.watermark = (info.wizStyle != QWizard::MacStyle) && (info.wizStyle != QWizard::AeroStyle)
        && !watermarkPixmap.isNull();
    info.title = !info.header && !titleText.isEmpty();
    info.subTitle = !(opts & QWizard::IgnoreSubTitles) && !info.header && !subTitleText.isEmpty();
    info.extension = info.watermark && (opts & QWizard::ExtendedWatermarkPixmap);

    return info;
}

void QWizardPrivate::recreateLayout(const QWizardLayoutInfo &info)
{
    Q_Q(QWizard);

    /*
        Start by undoing the main layout.
    */
    for (int i = mainLayout->count() - 1; i >= 0; --i) {
        QLayoutItem *item = mainLayout->takeAt(i);
        if (item->layout()) {
            item->layout()->setParent(0);
        } else {
            delete item;
        }
    }
    for (int i = mainLayout->columnCount() - 1; i >= 0; --i)
        mainLayout->setColumnMinimumWidth(i, 0);
    for (int i = mainLayout->rowCount() - 1; i >= 0; --i)
        mainLayout->setRowMinimumHeight(i, 0);

    /*
        Now, recreate it.
    */

    bool mac = (info.wizStyle == QWizard::MacStyle);
    bool classic = (info.wizStyle == QWizard::ClassicStyle);
    bool modern = (info.wizStyle == QWizard::ModernStyle);
    bool aero = (info.wizStyle == QWizard::AeroStyle);
    int deltaMarginLeft = info.topLevelMarginLeft - info.childMarginLeft;
    int deltaMarginRight = info.topLevelMarginRight - info.childMarginRight;
    int deltaMarginTop = info.topLevelMarginTop - info.childMarginTop;
    int deltaMarginBottom = info.topLevelMarginBottom - info.childMarginBottom;
    int deltaVSpacing = info.topLevelMarginBottom - info.vspacing;

    int row = 0;
    int numColumns;
    if (mac) {
        numColumns = 3;
    } else if (info.watermark) {
        numColumns = 2;
    } else {
        numColumns = 1;
    }
    int pageColumn = qMin(1, numColumns - 1);

    if (mac) {
        mainLayout->setMargin(0);
        mainLayout->setSpacing(0);
        buttonLayout->setContentsMargins(MacLayoutLeftMargin, MacButtonTopMargin, MacLayoutRightMargin, MacLayoutBottomMargin);
        pageVBoxLayout->setMargin(7);
    } else {
        if (modern) {
            mainLayout->setMargin(0);
            mainLayout->setSpacing(0);
            pageVBoxLayout->setContentsMargins(deltaMarginLeft, deltaMarginTop,
                                               deltaMarginRight, deltaMarginBottom);
            buttonLayout->setContentsMargins(info.topLevelMarginLeft, info.topLevelMarginTop,
                                             info.topLevelMarginRight, info.topLevelMarginBottom);
        } else {
            mainLayout->setContentsMargins(info.topLevelMarginLeft, info.topLevelMarginTop,
                                           info.topLevelMarginRight, info.topLevelMarginBottom);
            mainLayout->setHorizontalSpacing(info.hspacing);
            mainLayout->setVerticalSpacing(info.vspacing);
            pageVBoxLayout->setContentsMargins(0, 0, 0, 0);
            buttonLayout->setContentsMargins(0, 0, 0, 0);
        }
    }
    buttonLayout->setSpacing(info.buttonSpacing);

    if (info.header) {
        if (!headerWidget)
            headerWidget = new QWizardHeader(antiFlickerWidget);
        headerWidget->setAutoFillBackground(modern);
        mainLayout->addWidget(headerWidget, row++, 0, 1, numColumns);
    }
    if (headerWidget)
        headerWidget->setVisible(info.header);

    int watermarkStartRow = row;

    if (mac)
        mainLayout->setRowMinimumHeight(row++, 10);

    if (info.title) {
        if (!titleLabel) {
            titleLabel = new QLabel(antiFlickerWidget);
            titleLabel->setBackgroundRole(QPalette::Base);
            titleLabel->setWordWrap(true);
        }

        QFont titleFont = q->font();
        titleFont.setPointSize(titleFont.pointSize() + (mac ? 3 : 4));
        titleFont.setBold(true);
        titleLabel->setPalette(QPalette());

        if (aero) {
            // ### hardcoded for now:
            titleFont = QFont(QLatin1String("Segoe UI"), 12);
            QPalette pal(titleLabel->palette());
            pal.setColor(QPalette::Text, "#003399");
            titleLabel->setPalette(pal);
        }

        titleLabel->setFont(titleFont);
        const int aeroTitleIndent = 25; // ### hardcoded for now - should be calculated somehow
        if (aero)
            titleLabel->setIndent(aeroTitleIndent);
        else if (mac)
            titleLabel->setIndent(2);
        else if (classic)
            titleLabel->setIndent(info.childMarginLeft);
        else
            titleLabel->setIndent(info.topLevelMarginLeft);
        if (modern) {
            if (!placeholderWidget1) {
                placeholderWidget1 = new QWidget(antiFlickerWidget);
                placeholderWidget1->setBackgroundRole(QPalette::Base);
            }
            placeholderWidget1->setFixedHeight(info.topLevelMarginLeft + 2);
            mainLayout->addWidget(placeholderWidget1, row++, pageColumn);
        }
        mainLayout->addWidget(titleLabel, row++, pageColumn);
        if (modern) {
            if (!placeholderWidget2) {
                placeholderWidget2 = new QWidget(antiFlickerWidget);
                placeholderWidget2->setBackgroundRole(QPalette::Base);
            }
            placeholderWidget2->setFixedHeight(5);
            mainLayout->addWidget(placeholderWidget2, row++, pageColumn);
        }
        if (mac)
            mainLayout->setRowMinimumHeight(row++, 7);
    }
    if (placeholderWidget1)
        placeholderWidget1->setVisible(info.title && modern);
    if (placeholderWidget2)
        placeholderWidget2->setVisible(info.title && modern);

    if (info.subTitle) {
        if (!subTitleLabel) {
            subTitleLabel = new QLabel(pageFrame);
            subTitleLabel->setWordWrap(true);

            subTitleLabel->setContentsMargins(info.childMarginLeft , 0,
                                              info.childMarginRight , 0);

            pageVBoxLayout->insertWidget(1, subTitleLabel);
        }
    }

    // ### try to replace with margin.
    changeSpacerSize(pageVBoxLayout, 0, 0, info.subTitle ? info.childMarginLeft : 0);

    int hMargin = mac ? 1 : 0;
    int vMargin = hMargin;

    pageFrame->setFrameStyle(mac ? (QFrame::Box | QFrame::Raised) : QFrame::NoFrame);
    pageFrame->setLineWidth(0);
    pageFrame->setMidLineWidth(hMargin);

    if (info.header) {
        if (modern) {
            hMargin = info.topLevelMarginLeft;
            vMargin = deltaMarginBottom;
        } else if (classic) {
            hMargin = deltaMarginLeft + ClassicHMargin;
            vMargin = 0;
        }
    }

    if (aero) {
        int leftMargin   = 18; // ### hardcoded for now - should be calculated somehow
        int topMargin    = vMargin;
        int rightMargin  = hMargin; // ### for now
        int bottomMargin = vMargin;
        pageFrame->setContentsMargins(leftMargin, topMargin, rightMargin, bottomMargin);
    } else {
        pageFrame->setContentsMargins(hMargin, vMargin, hMargin, vMargin);
    }

    if (info.watermark && !watermarkLabel) {
        watermarkLabel = new QLabel(antiFlickerWidget);
        watermarkLabel->setBackgroundRole(QPalette::Base);
        watermarkLabel->setMinimumHeight(1);
        watermarkLabel->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Expanding);
        watermarkLabel->setAlignment(Qt::AlignLeft | Qt::AlignTop);
    }

    //bool wasSemiTransparent = pageFrame->testAttribute(Qt::WA_SetPalette);
    const bool wasSemiTransparent =
        pageFrame->palette().brush(QPalette::Window).color().alpha() < 255
        || pageFrame->palette().brush(QPalette::Base).color().alpha() < 255;
    if (mac) {
        if (!wasSemiTransparent) {
            QPalette pal = pageFrame->palette();
            pal.setBrush(QPalette::Window, QColor(255, 255, 255, 153));
            // ### The next line is required to ensure visual semitransparency when
            // ### switching from ModernStyle to MacStyle. See TAG1 below.
            pal.setBrush(QPalette::Base, QColor(255, 255, 255, 153));
            pageFrame->setPalette(pal);
            pageFrame->setAutoFillBackground(true);
            antiFlickerWidget->setAutoFillBackground(false);
        }
    } else {
        if (wasSemiTransparent)
            pageFrame->setPalette(QPalette());

        bool baseBackground = (modern && !info.header); // ### TAG1
        pageFrame->setBackgroundRole(baseBackground ? QPalette::Base : QPalette::Window);

        if (titleLabel)
            titleLabel->setAutoFillBackground(baseBackground);
        pageFrame->setAutoFillBackground(baseBackground);
        if (watermarkLabel)
            watermarkLabel->setAutoFillBackground(baseBackground);
        if (placeholderWidget1)
            placeholderWidget1->setAutoFillBackground(baseBackground);
        if (placeholderWidget2)
            placeholderWidget2->setAutoFillBackground(baseBackground);

        if (aero) {
            QPalette pal = pageFrame->palette();
            pal.setBrush(QPalette::Window, QColor(255, 255, 255));
            pageFrame->setPalette(pal);
            pageFrame->setAutoFillBackground(true);
            pal = antiFlickerWidget->palette();
            pal.setBrush(QPalette::Window, QColor(255, 255, 255));
            antiFlickerWidget->setPalette(pal);
            antiFlickerWidget->setAutoFillBackground(true);
        }
    }

    mainLayout->addWidget(pageFrame, row++, pageColumn);

    int watermarkEndRow = row;
    if (classic)
        mainLayout->setRowMinimumHeight(row++, deltaVSpacing);

    if (aero) {
        buttonLayout->setContentsMargins(9, 9, 9, 9);
        mainLayout->setContentsMargins(0, 11, 0, 0);
    }

    int buttonStartColumn = info.extension ? 1 : 0;
    int buttonNumColumns = info.extension ? 1 : numColumns;

    if (classic || modern) {
        if (!bottomRuler)
            bottomRuler = new QWizardRuler(antiFlickerWidget);
        mainLayout->addWidget(bottomRuler, row++, buttonStartColumn, 1, buttonNumColumns);
    }

    if (classic)
        mainLayout->setRowMinimumHeight(row++, deltaVSpacing);

    mainLayout->addLayout(buttonLayout, row++, buttonStartColumn, 1, buttonNumColumns);

    if (info.watermark) {
        if (info.extension)
            watermarkEndRow = row;
        mainLayout->addWidget(watermarkLabel, watermarkStartRow, 0,
                              watermarkEndRow - watermarkStartRow, 1);
    }

    mainLayout->setColumnMinimumWidth(0, mac && !info.watermark ? 181 : 0);
    if (mac)
        mainLayout->setColumnMinimumWidth(2, 21);

    if (headerWidget)
        headerWidget->setVisible(info.header);
    if (titleLabel)
        titleLabel->setVisible(info.title);
    if (subTitleLabel)
        subTitleLabel->setVisible(info.subTitle);
    if (bottomRuler)
        bottomRuler->setVisible(classic || modern);
    if (watermarkLabel)
        watermarkLabel->setVisible(info.watermark);

    layoutInfo = info;
}

void QWizardPrivate::updateLayout()
{
    Q_Q(QWizard);

    disableUpdates();

    QWizardLayoutInfo info = layoutInfoForCurrentPage();
    if (layoutInfo != info)
        recreateLayout(info);
    QWizardPage *page = q->currentPage();

    // If the page can expand vertically, let it stretch "infinitely" more
    // than the QSpacerItem at the bottom. Otherwise, let the QSpacerItem
    // stretch "infinitely" more than the page. Change the bottom item's
    // policy accordingly. The case that the page has no layout is basically
    // for Designer, only.
    if (page) {
        bool expandPage = !page->layout();
        if (!expandPage) {
            const QLayoutItem *pageItem = pageVBoxLayout->itemAt(pageVBoxLayout->indexOf(page));
            expandPage = pageItem->expandingDirections() & Qt::Vertical;
        }
        QSpacerItem *bottomSpacer = pageVBoxLayout->itemAt(pageVBoxLayout->count() -  1)->spacerItem();
        Q_ASSERT(bottomSpacer);
        bottomSpacer->changeSize(0, 0, QSizePolicy::Ignored, expandPage ? QSizePolicy::Ignored : QSizePolicy::MinimumExpanding);
        pageVBoxLayout->invalidate();
    }

    if (info.header) {
        Q_ASSERT(page);
        headerWidget->setup(info, page->title(), page->subTitle(),
                            page->pixmap(QWizard::LogoPixmap), page->pixmap(QWizard::BannerPixmap),
                            titleFmt, subTitleFmt);
    }

    if (info.watermark) {
        Q_ASSERT(page);
        watermarkLabel->setPixmap(page->pixmap(QWizard::WatermarkPixmap));
    }
    if (info.title) {
        Q_ASSERT(page);
        titleLabel->setTextFormat(titleFmt);
        titleLabel->setText(page->title());
    }
    if (info.subTitle) {
        Q_ASSERT(page);
        subTitleLabel->setTextFormat(subTitleFmt);
        subTitleLabel->setText(page->subTitle());
    }

    enableUpdates();
    updateMinMaxSizes(info);
}

void QWizardPrivate::updateMinMaxSizes(const QWizardLayoutInfo &info)
{
    Q_Q(QWizard);

    int extraHeight = 0;
#if !defined(QT_NO_STYLE_WINDOWSVISTA)
    if (isVistaThemeEnabled())
        extraHeight = vistaHelper->titleBarSize() + vistaHelper->topOffset();
#endif
    QSize minimumSize = mainLayout->totalMinimumSize() + QSize(0, extraHeight);
    QSize maximumSize = mainLayout->totalMaximumSize();
    if (info.header && headerWidget->maximumWidth() != QWIDGETSIZE_MAX) {
        minimumSize.setWidth(headerWidget->maximumWidth());
        maximumSize.setWidth(headerWidget->maximumWidth());
    }
    if (info.watermark) {
        minimumSize.setHeight(mainLayout->totalSizeHint().height());
        maximumSize.setHeight(mainLayout->totalSizeHint().height());
    }
    if (q->minimumWidth() == minimumWidth) {
        minimumWidth = minimumSize.width();
        q->setMinimumWidth(minimumWidth);
    }
    if (q->minimumHeight() == minimumHeight) {
        minimumHeight = minimumSize.height();
        q->setMinimumHeight(minimumHeight);
    }
    if (q->maximumWidth() == maximumWidth) {
        maximumWidth = maximumSize.width();
        q->setMaximumWidth(maximumWidth);
    }
    if (q->maximumHeight() == maximumHeight) {
        maximumHeight = maximumSize.height();
        q->setMaximumHeight(maximumHeight);
    }
}

void QWizardPrivate::updateCurrentPage()
{
    Q_Q(QWizard);
    if (q->currentPage()) {
        canContinue = (q->nextId() != -1);
        canFinish = q->currentPage()->isFinalPage();
    } else {
        canContinue = false;
        canFinish = false;
    }
    _q_updateButtonStates();
    updateButtonTexts();
}

bool QWizardPrivate::ensureButton(QWizard::WizardButton which) const
{
    Q_Q(const QWizard);
    if (uint(which) >= QWizard::NButtons)
        return false;

    if (!btns[which]) {
        QPushButton *pushButton = new QPushButton(antiFlickerWidget);
        QStyle *style = q->style();
        if (style != QApplication::style()) // Propagate style
            pushButton->setStyle(style);
        // Make navigation buttons detectable as passive interactor in designer
        switch (which) {
            case QWizard::CommitButton:
            case QWizard::FinishButton:
            case QWizard::CancelButton:
            break;
        default: {
            QString objectName = QLatin1String("__qt__passive_wizardbutton");
            objectName += QString::number(which);
            pushButton->setObjectName(objectName);
        }
            break;
        }
#ifdef Q_WS_MAC
        pushButton->setAutoDefault(false);
#endif
        pushButton->hide();
#ifdef Q_CC_HPACC
        const_cast<QWizardPrivate *>(this)->btns[which] = pushButton;
#else
        btns[which] = pushButton;
#endif
        if (which < QWizard::NStandardButtons)
            pushButton->setText(buttonDefaultText(wizStyle, which, this));

#ifdef QT_SOFTKEYS_ENABLED
        QAction *softKey = new QAction(pushButton->text(), pushButton);
        QAction::SoftKeyRole softKeyRole;
        switch(which) {
        case QWizard::NextButton:
        case QWizard::FinishButton:
        case QWizard::CancelButton:
            softKeyRole = QAction::NegativeSoftKey;
            break;
        case QWizard::BackButton:
        case QWizard::CommitButton:
        case QWizard::HelpButton:
        case QWizard::CustomButton1:
        case QWizard::CustomButton2:
        case QWizard::CustomButton3:
        default:
            softKeyRole = QAction::PositiveSoftKey;
            break;
        }
        softKey->setSoftKeyRole(softKeyRole);
        softKeys[which] = softKey;
#endif
        connectButton(which);
    }
    return true;
}

void QWizardPrivate::connectButton(QWizard::WizardButton which) const
{
    Q_Q(const QWizard);
    if (which < QWizard::NStandardButtons) {
        QObject::connect(btns[which], SIGNAL(clicked()), q, buttonSlots[which]);
    } else {
        QObject::connect(btns[which], SIGNAL(clicked()), q, SLOT(_q_emitCustomButtonClicked()));
    }

#ifdef QT_SOFTKEYS_ENABLED
    QObject::connect(softKeys[which], SIGNAL(triggered()), btns[which], SIGNAL(clicked()));
#endif
}

void QWizardPrivate::updateButtonTexts()
{
    Q_Q(QWizard);
    for (int i = 0; i < QWizard::NButtons; ++i) {
        if (btns[i]) {
            if (q->currentPage() && (q->currentPage()->d_func()->buttonCustomTexts.contains(i)))
                btns[i]->setText(q->currentPage()->d_func()->buttonCustomTexts.value(i));
            else if (buttonCustomTexts.contains(i))
                btns[i]->setText(buttonCustomTexts.value(i));
            else if (i < QWizard::NStandardButtons)
                btns[i]->setText(buttonDefaultText(wizStyle, i, this));
#ifdef QT_SOFTKEYS_ENABLED
            softKeys[i]->setText(btns[i]->text());
#endif
        }
    }
}

void QWizardPrivate::updateButtonLayout()
{
    if (buttonsHaveCustomLayout) {
        QVarLengthArray<QWizard::WizardButton> array(buttonsCustomLayout.count());
        for (int i = 0; i < buttonsCustomLayout.count(); ++i)
            array[i] = buttonsCustomLayout.at(i);
        setButtonLayout(array.constData(), array.count());
    } else {
        // Positions:
        //     Help Stretch Custom1 Custom2 Custom3 Cancel Back Next Commit Finish Cancel Help

        const int ArraySize = 12;
        QWizard::WizardButton array[ArraySize];
        memset(array, -1, sizeof(array));
        Q_ASSERT(array[0] == QWizard::NoButton);

        if (opts & QWizard::HaveHelpButton) {
            int i = (opts & QWizard::HelpButtonOnRight) ? 11 : 0;
            array[i] = QWizard::HelpButton;
        }
        array[1] = QWizard::Stretch;
        if (opts & QWizard::HaveCustomButton1)
            array[2] = QWizard::CustomButton1;
        if (opts & QWizard::HaveCustomButton2)
            array[3] = QWizard::CustomButton2;
        if (opts & QWizard::HaveCustomButton3)
            array[4] = QWizard::CustomButton3;

        if (!(opts & QWizard::NoCancelButton)) {
            int i = (opts & QWizard::CancelButtonOnLeft) ? 5 : 10;
            array[i] = QWizard::CancelButton;
        }
        array[6] = QWizard::BackButton;
        array[7] = QWizard::NextButton;
        array[8] = QWizard::CommitButton;
        array[9] = QWizard::FinishButton;

        setButtonLayout(array, ArraySize);
    }
}

void QWizardPrivate::setButtonLayout(const QWizard::WizardButton *array, int size)
{
    QWidget *prev = pageFrame;

    for (int i = buttonLayout->count() - 1; i >= 0; --i) {
        QLayoutItem *item = buttonLayout->takeAt(i);
        if (QWidget *widget = item->widget())
            widget->hide();
        delete item;
    }

    for (int i = 0; i < size; ++i) {
        QWizard::WizardButton which = array[i];
        if (which == QWizard::Stretch) {
            buttonLayout->addStretch(1);
        } else if (which != QWizard::NoButton) {
            ensureButton(which);
            buttonLayout->addWidget(btns[which]);

            // Back, Next, Commit, and Finish are handled in _q_updateButtonStates()
            if (which != QWizard::BackButton && which != QWizard::NextButton
                && which != QWizard::CommitButton && which != QWizard::FinishButton)
                btns[which]->show();

            if (prev)
                QWidget::setTabOrder(prev, btns[which]);
            prev = btns[which];
        }
    }

    _q_updateButtonStates();
}

bool QWizardPrivate::buttonLayoutContains(QWizard::WizardButton which)
{
    return !buttonsHaveCustomLayout || buttonsCustomLayout.contains(which);
}

void QWizardPrivate::updatePixmap(QWizard::WizardPixmap which)
{
    Q_Q(QWizard);
    if (which == QWizard::BackgroundPixmap) {
        if (wizStyle == QWizard::MacStyle) {
            q->update();
            q->updateGeometry();
        }
    } else {
        updateLayout();
    }
}

#if !defined(QT_NO_STYLE_WINDOWSVISTA)
bool QWizardPrivate::vistaDisabled() const
{
    Q_Q(const QWizard);
    const QVariant v = q->property("_q_wizard_vista_off");
    return v.isValid() && v.toBool();
}

bool QWizardPrivate::isVistaThemeEnabled(QVistaHelper::VistaState state) const
{
    return wizStyle == QWizard::AeroStyle
        && QVistaHelper::vistaState() == state
        && !vistaDisabled();
}

void QWizardPrivate::handleAeroStyleChange()
{
    Q_Q(QWizard);

    if (inHandleAeroStyleChange)
        return; // prevent recursion
    inHandleAeroStyleChange = true;

    vistaHelper->disconnectBackButton();
    q->removeEventFilter(vistaHelper);

    if (isVistaThemeEnabled()) {
        if (isVistaThemeEnabled(QVistaHelper::VistaAero)) {
            vistaHelper->setDWMTitleBar(QVistaHelper::ExtendedTitleBar);
            q->installEventFilter(vistaHelper);
            q->setMouseTracking(true);
            antiFlickerWidget->move(0, vistaHelper->titleBarSize() + vistaHelper->topOffset());
            vistaHelper->backButton()->move(
                0, vistaHelper->topOffset() // ### should ideally work without the '+ 1'
                - qMin(vistaHelper->topOffset(), vistaHelper->topPadding() + 1));
        } else {
            vistaHelper->setDWMTitleBar(QVistaHelper::NormalTitleBar);
            q->setMouseTracking(true);
            antiFlickerWidget->move(0, vistaHelper->topOffset());
            vistaHelper->backButton()->move(0, -1); // ### should ideally work with (0, 0)
        }
        vistaHelper->setTitleBarIconAndCaptionVisible(false);
        QObject::connect(
            vistaHelper->backButton(), SIGNAL(clicked()), q, buttonSlots[QWizard::BackButton]);
        vistaHelper->backButton()->show();
    } else {
        q->setMouseTracking(true); // ### original value possibly different
#ifndef QT_NO_CURSOR
        q->unsetCursor(); // ### ditto
#endif
        antiFlickerWidget->move(0, 0);
        vistaHelper->hideBackButton();
        vistaHelper->setTitleBarIconAndCaptionVisible(true);
    }

    _q_updateButtonStates();

    if (q->isVisible())
        vistaHelper->setWindowPosHack();

    inHandleAeroStyleChange = false;
}
#endif

bool QWizardPrivate::isVistaThemeEnabled() const
{
#if !defined(QT_NO_STYLE_WINDOWSVISTA)
    return isVistaThemeEnabled(QVistaHelper::VistaAero)
        || isVistaThemeEnabled(QVistaHelper::VistaBasic);
#else
    return false;
#endif
}

void QWizardPrivate::disableUpdates()
{
    Q_Q(QWizard);
    if (disableUpdatesCount++ == 0) {
        q->setUpdatesEnabled(false);
        antiFlickerWidget->hide();
    }
}

void QWizardPrivate::enableUpdates()
{
    Q_Q(QWizard);
    if (--disableUpdatesCount == 0) {
        antiFlickerWidget->show();
        q->setUpdatesEnabled(true);
    }
}

void QWizardPrivate::_q_emitCustomButtonClicked()
{
    Q_Q(QWizard);
    QObject *button = q->sender();
    for (int i = QWizard::NStandardButtons; i < QWizard::NButtons; ++i) {
        if (btns[i] == button) {
            emit q->customButtonClicked(QWizard::WizardButton(i));
            break;
        }
    }
}

void QWizardPrivate::_q_updateButtonStates()
{
    Q_Q(QWizard);

    disableUpdates();

    const QWizardPage *page = q->currentPage();
    bool complete = page && page->isComplete();

    btn.back->setEnabled(history.count() > 1
                         && !q->page(history.at(history.count() - 2))->isCommitPage()
                         && (!canFinish || !(opts & QWizard::DisabledBackButtonOnLastPage)));
    btn.next->setEnabled(canContinue && complete);
    btn.commit->setEnabled(canContinue && complete);
    btn.finish->setEnabled(canFinish && complete);

    const bool backButtonVisible = buttonLayoutContains(QWizard::BackButton)
        && (history.count() > 1 || !(opts & QWizard::NoBackButtonOnStartPage))
        && (canContinue || !(opts & QWizard::NoBackButtonOnLastPage));
    bool commitPage = page && page->isCommitPage();
    btn.back->setVisible(backButtonVisible);
    btn.next->setVisible(buttonLayoutContains(QWizard::NextButton) && !commitPage
                         && (canContinue || (opts & QWizard::HaveNextButtonOnLastPage)));
    btn.commit->setVisible(buttonLayoutContains(QWizard::CommitButton) && commitPage
                           && canContinue);
    btn.finish->setVisible(buttonLayoutContains(QWizard::FinishButton)
                           && (canFinish || (opts & QWizard::HaveFinishButtonOnEarlyPages)));

    bool useDefault = !(opts & QWizard::NoDefaultButton);
    if (QPushButton *nextPush = qobject_cast<QPushButton *>(btn.next))
        nextPush->setDefault(canContinue && useDefault && !commitPage);
    if (QPushButton *commitPush = qobject_cast<QPushButton *>(btn.commit))
        commitPush->setDefault(canContinue && useDefault && commitPage);
    if (QPushButton *finishPush = qobject_cast<QPushButton *>(btn.finish))
        finishPush->setDefault(!canContinue && useDefault);

#if !defined(QT_NO_STYLE_WINDOWSVISTA)
    if (isVistaThemeEnabled()) {
        vistaHelper->backButton()->setEnabled(btn.back->isEnabled());
        vistaHelper->backButton()->setVisible(backButtonVisible);
        btn.back->setVisible(false);
    }
#endif

#ifdef QT_SOFTKEYS_ENABLED
    QAbstractButton *wizardButton;
    for (int i = 0; i < QWizard::NButtons; ++i) {
        wizardButton = btns[i];
        if (wizardButton && !wizardButton->testAttribute(Qt::WA_WState_Hidden)) {
            wizardButton->hide();
            q->addAction(softKeys[i]);
        } else {
            q->removeAction(softKeys[i]);
        }
    }
#endif

    enableUpdates();
}

void QWizardPrivate::_q_handleFieldObjectDestroyed(QObject *object)
{
    QVector<QWizardField>::iterator it = fields.begin();
    while (it != fields.end()) {
        const QWizardField &field = *it;
        if (field.object == object) {
            fieldIndexMap.remove(field.name);
            it = fields.erase(it);
        } else {
            ++it;
        }
    }
}

void QWizardPrivate::setStyle(QStyle *style)
{
    for (int i = 0; i < QWizard::NButtons; i++)
        if (btns[i])
            btns[i]->setStyle(style);
    const PageMap::const_iterator pcend = pageMap.constEnd();
    for (PageMap::const_iterator it = pageMap.constBegin(); it != pcend; ++it)
        it.value()->setStyle(style);
}

#ifdef Q_WS_MAC

QPixmap QWizardPrivate::findDefaultBackgroundPixmap()
{
    QCFType<CFURLRef> url;
    const int ExpectedImageWidth = 242;
    const int ExpectedImageHeight = 414;
    if (LSFindApplicationForInfo(kLSUnknownCreator, CFSTR("com.apple.KeyboardSetupAssistant"),
                                 0, 0, &url) == noErr) {
        QCFType<CFBundleRef> bundle = CFBundleCreate(kCFAllocatorDefault, url);
        if (bundle) {
            url = CFBundleCopyResourceURL(bundle, CFSTR("Background"), CFSTR("tif"), 0);
            if (url) {
                QCFType<CGImageSourceRef> imageSource = CGImageSourceCreateWithURL(url, 0);
                QCFType<CGImageRef> image = CGImageSourceCreateImageAtIndex(imageSource, 0, 0);
                if (image) {
                    int width = CGImageGetWidth(image);
                    int height = CGImageGetHeight(image);
                    if (width == ExpectedImageWidth && height == ExpectedImageHeight)
                        return QPixmap::fromMacCGImageRef(image);
                }
            }
        }
    }
    return QPixmap();

}

#endif

#if !defined(QT_NO_STYLE_WINDOWSVISTA)
void QWizardAntiFlickerWidget::paintEvent(QPaintEvent *)
{
    if (wizardPrivate->isVistaThemeEnabled()) {
        int leftMargin, topMargin, rightMargin, bottomMargin;
        wizardPrivate->buttonLayout->getContentsMargins(
            &leftMargin, &topMargin, &rightMargin, &bottomMargin);
        const int buttonLayoutTop = wizardPrivate->buttonLayout->contentsRect().top() - topMargin;
        QPainter painter(this);
        const QBrush brush(QColor(240, 240, 240)); // ### hardcoded for now
        painter.fillRect(0, buttonLayoutTop, width(), height() - buttonLayoutTop, brush);
        painter.setPen(QPen(QBrush(QColor(223, 223, 223)), 0)); // ### hardcoded for now
        painter.drawLine(0, buttonLayoutTop, width(), buttonLayoutTop);
        if (wizardPrivate->isVistaThemeEnabled(QVistaHelper::VistaBasic)) {
            if (window()->isActiveWindow())
                painter.setPen(QPen(QBrush(QColor(169, 191, 214)), 0)); // ### hardcoded for now
            else
                painter.setPen(QPen(QBrush(QColor(182, 193, 204)), 0)); // ### hardcoded for now
            painter.drawLine(0, 0, width(), 0);
        }
    }
}
#endif

/*!
    \class QWizard
    \since 4.3
    \brief The QWizard class provides a framework for wizards.

    A wizard (also called an assistant on Mac OS X) is a special type
    of input dialog that consists of a sequence of pages. A wizard's
    purpose is to guide the user through a process step by step.
    Wizards are useful for complex or infrequent tasks that users may
    find difficult to learn.

    QWizard inherits QDialog and represents a wizard. Each page is a
    QWizardPage (a QWidget subclass). To create your own wizards, you
    can use these classes directly, or you can subclass them for more
    control.

    Topics:

    \tableofcontents

    \section1 A Trivial Example

    The following example illustrates how to create wizard pages and
    add them to a wizard. For more advanced examples, see
    \l{dialogs/classwizard}{Class Wizard} and \l{dialogs/licensewizard}{License
    Wizard}.

    \snippet examples/dialogs/trivialwizard/trivialwizard.cpp 1
    \snippet examples/dialogs/trivialwizard/trivialwizard.cpp 3
    \dots
    \snippet examples/dialogs/trivialwizard/trivialwizard.cpp 4
    \codeline
    \snippet examples/dialogs/trivialwizard/trivialwizard.cpp 5
    \snippet examples/dialogs/trivialwizard/trivialwizard.cpp 7
    \dots
    \snippet examples/dialogs/trivialwizard/trivialwizard.cpp 8
    \codeline
    \snippet examples/dialogs/trivialwizard/trivialwizard.cpp 10

    \section1 Wizard Look and Feel

    QWizard supports four wizard looks:

    \list
    \o ClassicStyle
    \o ModernStyle
    \o MacStyle
    \o AeroStyle
    \endlist

    You can explicitly set the look to use using setWizardStyle()
    (e.g., if you want the same look on all platforms).

    \table
    \header \o ClassicStyle
            \o ModernStyle
            \o MacStyle
            \o AeroStyle
    \row    \o \inlineimage qtwizard-classic1.png
            \o \inlineimage qtwizard-modern1.png
            \o \inlineimage qtwizard-mac1.png
            \o \inlineimage qtwizard-aero1.png
    \row    \o \inlineimage qtwizard-classic2.png
            \o \inlineimage qtwizard-modern2.png
            \o \inlineimage qtwizard-mac2.png
            \o \inlineimage qtwizard-aero2.png
    \endtable

    Note: AeroStyle has effect only on a Windows Vista system with alpha compositing enabled.
    ModernStyle is used as a fallback when this condition is not met.

    In addition to the wizard style, there are several options that
    control the look and feel of the wizard. These can be set using
    setOption() or setOptions(). For example, HaveHelpButton makes
    QWizard show a \gui Help button along with the other wizard
    buttons.

    You can even change the order of the wizard buttons to any
    arbitrary order using setButtonLayout(), and you can add up to
    three custom buttons (e.g., a \gui Print button) to the button
    row. This is achieved by calling setButton() or setButtonText()
    with CustomButton1, CustomButton2, or CustomButton3 to set up the
    button, and by enabling the HaveCustomButton1, HaveCustomButton2,
    or HaveCustomButton3 options. Whenever the user clicks a custom
    button, customButtonClicked() is emitted. For example:

    \snippet examples/dialogs/licensewizard/licensewizard.cpp 29

    \section1 Elements of a Wizard Page

    Wizards consist of a sequence of \l{QWizardPage}s. At any time,
    only one page is shown. A page has the following attributes:

    \list
    \o A \l{QWizardPage::}{title}.
    \o A \l{QWizardPage::}{subTitle}.
    \o A set of pixmaps, which may or may not be honored, depending
       on the wizard's style:
        \list
        \o WatermarkPixmap (used by ClassicStyle and ModernStyle)
        \o BannerPixmap (used by ModernStyle)
        \o LogoPixmap (used by ClassicStyle and ModernStyle)
        \o BackgroundPixmap (used by MacStyle)
        \endlist
    \endlist

    The diagram belows shows how QWizard renders these attributes,
    assuming they are all present and ModernStyle is used:

    \image qtwizard-nonmacpage.png

    When a \l{QWizardPage::}{subTitle} is set, QWizard displays it
    in a header, in which case it also uses the BannerPixmap and the
    LogoPixmap to decorate the header. The WatermarkPixmap is
    displayed on the left side, below the header. At the bottom,
    there is a row of buttons allowing the user to navigate through
    the pages.

    The page itself (the \l{QWizardPage} widget) occupies the area
    between the header, the watermark, and the button row. Typically,
    the page is a QWizardPage on which a QGridLayout is installed,
    with standard child widgets (\l{QLabel}s, \l{QLineEdit}s, etc.).

    If the wizard's style is MacStyle, the page looks radically
    different:

    \image qtwizard-macpage.png

    The watermark, banner, and logo pixmaps are ignored by the
    MacStyle. If the BackgroundPixmap is set, it is used as the
    background for the wizard; otherwise, a default "assistant" image
    is used.

    The title and subtitle are set by calling
    QWizardPage::setTitle() and QWizardPage::setSubTitle() on the
    individual pages. They may be plain text or HTML (see titleFormat
    and subTitleFormat). The pixmaps can be set globally for the
    entire wizard using setPixmap(), or on a per-page basis using
    QWizardPage::setPixmap().

    \target field mechanism
    \section1 Registering and Using Fields

    In many wizards, the contents of a page may affect the default
    values of the fields of a later page. To make it easy to
    communicate between pages, QWizard supports a "field" mechanism
    that allows you to register a field (e.g., a QLineEdit) on a page
    and to access its value from any page. It is also possible to
    specify mandatory fields (i.e., fields that must be filled before
    the user can advance to the next page).

    To register a field, call QWizardPage::registerField() field.
    For example:

    \snippet examples/dialogs/classwizard/classwizard.cpp 8
    \dots
    \snippet examples/dialogs/classwizard/classwizard.cpp 10
    \snippet examples/dialogs/classwizard/classwizard.cpp 11
    \dots
    \snippet examples/dialogs/classwizard/classwizard.cpp 13

    The above code registers three fields, \c className, \c
    baseClass, and \c qobjectMacro, which are associated with three
    child widgets. The asterisk (\c *) next to \c className denotes a
    mandatory field.

    \target initialize page
    The fields of any page are accessible from any other page. For
    example:

    \snippet examples/dialogs/classwizard/classwizard.cpp 17

    Here, we call QWizardPage::field() to access the contents of the
    \c className field (which was defined in the \c ClassInfoPage)
    and use it to initialize the \c OuputFilePage. The field's
    contents is returned as a QVariant.

    When we create a field using QWizardPage::registerField(), we
    pass a unique field name and a widget. We can also provide a Qt
    property name and a "changed" signal (a signal that is emitted
    when the property changes) as third and fourth arguments;
    however, this is not necessary for the most common Qt widgets,
    such as QLineEdit, QCheckBox, and QComboBox, because QWizard
    knows which properties to look for.

    \target mandatory fields

    If an asterisk (\c *) is appended to the name when the property
    is registered, the field is a \e{mandatory field}. When a page has
    mandatory fields, the \gui Next and/or \gui Finish buttons are
    enabled only when all mandatory fields are filled.

    To consider a field "filled", QWizard simply checks that the
    field's current value doesn't equal the original value (the value
    it had when initializePage() was called). For QLineEdit and
    QAbstractSpinBox subclasses, QWizard also checks that
    \l{QLineEdit::hasAcceptableInput()}{hasAcceptableInput()} returns
    true, to honor any validator or mask.

    QWizard's mandatory field mechanism is provided for convenience.
    A more powerful (but also more cumbersome) alternative is to
    reimplement QWizardPage::isComplete() and to emit the
    QWizardPage::completeChanged() signal whenever the page becomes
    complete or incomplete.

    The enabled/disabled state of the \gui Next and/or \gui Finish
    buttons is one way to perform validation on the user input.
    Another way is to reimplement validateCurrentPage() (or
    QWizardPage::validatePage()) to perform some last-minute
    validation (and show an error message if the user has entered
    incomplete or invalid information). If the function returns true,
    the next page is shown (or the wizard finishes); otherwise, the
    current page stays up.

    \section1 Creating Linear Wizards

    Most wizards have a linear structure, with page 1 followed by
    page 2 and so on until the last page. The \l{dialogs/classwizard}{Class
    Wizard} example is such a wizard. With QWizard, linear wizards
    are created by instantiating the \l{QWizardPage}s and inserting
    them using addPage(). By default, the pages are shown in the
    order in which they were added. For example:

    \snippet examples/dialogs/classwizard/classwizard.cpp 0
    \dots
    \snippet examples/dialogs/classwizard/classwizard.cpp 2

    When a page is about to be shown, QWizard calls initializePage()
    (which in turn calls QWizardPage::initializePage()) to fill the
    page with default values. By default, this function does nothing,
    but it can be reimplemented to initialize the page's contents
    based on other pages' fields (see the \l{initialize page}{example
    above}).

    If the user presses \gui Back, cleanupPage() is called (which in
    turn calls QWizardPage::cleanupPage()). The default
    implementation resets the page's fields to their original values
    (the values they had before initializePage() was called). If you
    want the \gui Back button to be non-destructive and keep the
    values entered by the user, simply enable the IndependentPages
    option.

    \section1 Creating Non-Linear Wizards

    Some wizards are more complex in that they allow different
    traversal paths based on the information provided by the user.
    The \l{dialogs/licensewizard}{License Wizard} example illustrates this.
    It provides five wizard pages; depending on which options are
    selected, the user can reach different pages.

    \image licensewizard-flow.png

    In complex wizards, pages are identified by IDs. These IDs are
    typically defined using an enum. For example:

    \snippet examples/dialogs/licensewizard/licensewizard.h 0
    \dots
    \snippet examples/dialogs/licensewizard/licensewizard.h 2
    \dots
    \snippet examples/dialogs/licensewizard/licensewizard.h 3

    The pages are inserted using setPage(), which takes an ID and an
    instance of QWizardPage (or of a subclass):

    \snippet examples/dialogs/licensewizard/licensewizard.cpp 1
    \dots
    \snippet examples/dialogs/licensewizard/licensewizard.cpp 8

    By default, the pages are shown in increasing ID order. To
    provide a dynamic order that depends on the options chosen by the
    user, we must reimplement QWizardPage::nextId(). For example:

    \snippet examples/dialogs/licensewizard/licensewizard.cpp 18
    \codeline
    \snippet examples/dialogs/licensewizard/licensewizard.cpp 23
    \codeline
    \snippet examples/dialogs/licensewizard/licensewizard.cpp 24
    \codeline
    \snippet examples/dialogs/licensewizard/licensewizard.cpp 25
    \codeline
    \snippet examples/dialogs/licensewizard/licensewizard.cpp 26

    It would also be possible to put all the logic in one place, in a
    QWizard::nextId() reimplementation. For example:

    \snippet doc/src/snippets/code/src_gui_dialogs_qwizard.cpp 0

    To start at another page than the page with the lowest ID, call
    setStartId().

    To test whether a page has been visited or not, call
    hasVisitedPage(). For example:

    \snippet examples/dialogs/licensewizard/licensewizard.cpp 27

    \sa QWizardPage, {Class Wizard Example}, {License Wizard Example}
*/

/*!
    \enum QWizard::WizardButton

    This enum specifies the buttons in a wizard.

    \value BackButton  The \gui Back button (\gui {Go Back} on Mac OS X)
    \value NextButton  The \gui Next button (\gui Continue on Mac OS X)
    \value CommitButton  The \gui Commit button
    \value FinishButton  The \gui Finish button (\gui Done on Mac OS X)
    \value CancelButton  The \gui Cancel button (see also NoCancelButton)
    \value HelpButton    The \gui Help button (see also HaveHelpButton)
    \value CustomButton1  The first user-defined button (see also HaveCustomButton1)
    \value CustomButton2  The second user-defined button (see also HaveCustomButton2)
    \value CustomButton3  The third user-defined button (see also HaveCustomButton3)

    The following value is only useful when calling setButtonLayout():

    \value Stretch  A horizontal stretch in the button layout

    \omitvalue NoButton
    \omitvalue NStandardButtons
    \omitvalue NButtons

    \sa setButton(), setButtonText(), setButtonLayout(), customButtonClicked()
*/

/*!
    \enum QWizard::WizardPixmap

    This enum specifies the pixmaps that can be associated with a page.

    \value WatermarkPixmap  The tall pixmap on the left side of a ClassicStyle or ModernStyle page
    \value LogoPixmap  The small pixmap on the right side of a ClassicStyle or ModernStyle page header
    \value BannerPixmap  The pixmap that occupies the background of a ModernStyle page header
    \value BackgroundPixmap  The pixmap that occupies the background of a MacStyle wizard

    \omitvalue NPixmaps

    \sa setPixmap(), QWizardPage::setPixmap(), {Elements of a Wizard Page}
*/

/*!
    \enum QWizard::WizardStyle

    This enum specifies the different looks supported by QWizard.

    \value ClassicStyle  Classic Windows look
    \value ModernStyle  Modern Windows look
    \value MacStyle  Mac OS X look
    \value AeroStyle  Windows Aero look

    \omitvalue NStyles

    \sa setWizardStyle(), WizardOption, {Wizard Look and Feel}
*/

/*!
    \enum QWizard::WizardOption

    This enum specifies various options that affect the look and feel
    of a wizard.

    \value IndependentPages  The pages are independent of each other
                             (i.e., they don't derive values from each
                             other).
    \value IgnoreSubTitles  Don't show any subtitles, even if they are set.
    \value ExtendedWatermarkPixmap  Extend any WatermarkPixmap all the
                                    way down to the window's edge.
    \value NoDefaultButton  Don't make the \gui Next or \gui Finish button the
                            dialog's \l{QPushButton::setDefault()}{default button}.
    \value NoBackButtonOnStartPage  Don't show the \gui Back button on the start page.
    \value NoBackButtonOnLastPage   Don't show the \gui Back button on the last page.
    \value DisabledBackButtonOnLastPage  Disable the \gui Back button on the last page.
    \value HaveNextButtonOnLastPage  Show the (disabled) \gui Next button on the last page.
    \value HaveFinishButtonOnEarlyPages  Show the (disabled) \gui Finish button on non-final pages.
    \value NoCancelButton  Don't show the \gui Cancel button.
    \value CancelButtonOnLeft  Put the \gui Cancel button on the left of \gui Back (rather than on
                               the right of \gui Finish or \gui Next).
    \value HaveHelpButton  Show the \gui Help button.
    \value HelpButtonOnRight  Put the \gui Help button on the far right of the button layout
                              (rather than on the far left).
    \value HaveCustomButton1  Show the first user-defined button (CustomButton1).
    \value HaveCustomButton2  Show the second user-defined button (CustomButton2).
    \value HaveCustomButton3  Show the third user-defined button (CustomButton3).

    \sa setOptions(), setOption(), testOption()
*/

/*!
    Constructs a wizard with the given \a parent and window \a flags.

    \sa parent(), windowFlags()
*/
QWizard::QWizard(QWidget *parent, Qt::WindowFlags flags)
    : QDialog(*new QWizardPrivate, parent, flags)
{
    Q_D(QWizard);
    d->init();
#ifdef Q_WS_WINCE
    if (!qt_wince_is_mobile())
        setWindowFlags(windowFlags() & ~Qt::WindowOkButtonHint);
#endif
}

/*!
    Destroys the wizard and its pages, releasing any allocated resources.
*/
QWizard::~QWizard()
{
    Q_D(QWizard);
    delete d->buttonLayout;
}

/*!
    Adds the given \a page to the wizard, and returns the page's ID.

    The ID is guaranteed to be larger than any other ID in the
    QWizard so far.

    \sa setPage(), page()
*/
int QWizard::addPage(QWizardPage *page)
{
    Q_D(QWizard);
    int theid = 0;
    if (!d->pageMap.isEmpty())
        theid = (d->pageMap.constEnd() - 1).key() + 1;
    setPage(theid, page);
    return theid;
}

/*!
    \fn void QWizard::setPage(int id, QWizardPage *page)

    Adds the given \a page to the wizard with the given \a id.

    \sa addPage(), page()
*/
void QWizard::setPage(int theid, QWizardPage *page)
{
    Q_D(QWizard);

    if (!page) {
        qWarning("QWizard::setPage: Cannot insert null page");
        return;
    }

    if (theid == -1) {
        qWarning("QWizard::setPage: Cannot insert page with ID -1");
        return;
    }

    if (d->pageMap.contains(theid)) {
        qWarning("QWizard::setPage: Page with duplicate ID %d ignored", theid);
        return;
    }

    page->setParent(d->pageFrame);

    QVector<QWizardField> &pendingFields = page->d_func()->pendingFields;
    for (int i = 0; i < pendingFields.count(); ++i)
        d->addField(pendingFields.at(i));
    pendingFields.clear();

    connect(page, SIGNAL(completeChanged()), this, SLOT(_q_updateButtonStates()));

    d->pageMap.insert(theid, page);
    page->d_func()->wizard = this;

    int n = d->pageVBoxLayout->count();

    // disable layout to prevent layout updates while adding
    bool pageVBoxLayoutEnabled = d->pageVBoxLayout->isEnabled();
    d->pageVBoxLayout->setEnabled(false);

    d->pageVBoxLayout->insertWidget(n - 1, page);

    // hide new page and reset layout to old status
    page->hide();
    d->pageVBoxLayout->setEnabled(pageVBoxLayoutEnabled);
}

/*!
    Removes the page with the given \a id. cleanupPage() will be called if necessary.
    \since 4.5
    \sa addPage(), setPage()
*/
void QWizard::removePage(int id)
{
    Q_D(QWizard);

    QWizardPage *removedPage = 0;

    if (d->start == id)
        d->start = -1;

    if (!d->history.contains(id)) {
        // Case 1: removing a page not in the history
        removedPage = d->pageMap.take(id);
        d->updateCurrentPage();
    } else if (id != d->current) {
        // Case 2: removing a page in the history before the current page
        removedPage = d->pageMap.take(id);
        d->history.removeOne(id);
        d->_q_updateButtonStates();
    } else if (d->history.count() == 1) {
        // Case 3: removing the current page which is the first (and only) one in the history
        d->reset();
        removedPage = d->pageMap.take(id);
        if (d->pageMap.isEmpty())
            d->updateCurrentPage();
        else
            restart();
    } else {
        // Case 4: removing the current page which is not the first one in the history
        back();
        removedPage = d->pageMap.take(id);
        d->updateCurrentPage();
    }

    if (removedPage) {
        if (d->initialized.contains(id)) {
            cleanupPage(id);
            d->initialized.remove(id);
        }

        d->pageVBoxLayout->removeWidget(removedPage);

        for (int i = d->fields.count() - 1; i >= 0; --i) {
            if (d->fields.at(i).page == removedPage) {
                removedPage->d_func()->pendingFields += d->fields.at(i);
                d->removeFieldAt(i);
            }
        }
    }
}

/*!
    \fn QWizardPage *QWizard::page(int id) const

    Returns the page with the given \a id, or 0 if there is no such
    page.

    \sa addPage(), setPage()
*/
QWizardPage *QWizard::page(int theid) const
{
    Q_D(const QWizard);
    return d->pageMap.value(theid);
}

/*!
    \fn bool QWizard::hasVisitedPage(int id) const

    Returns true if the page history contains page \a id; otherwise,
    returns false.

    Pressing \gui Back marks the current page as "unvisited" again.

    \sa visitedPages()
*/
bool QWizard::hasVisitedPage(int theid) const
{
    Q_D(const QWizard);
    return d->history.contains(theid);
}

/*!
    Returns the list of IDs of visited pages, in the order in which the pages
    were visited.

    Pressing \gui Back marks the current page as "unvisited" again.

    \sa hasVisitedPage()
*/
QList<int> QWizard::visitedPages() const
{
    Q_D(const QWizard);
    return d->history;
}

/*!
    Returns the list of page IDs.
   \since 4.5
*/
QList<int> QWizard::pageIds() const
{
  Q_D(const QWizard);
  return d->pageMap.keys();
}

/*!
    \property QWizard::startId
    \brief the ID of the first page

    If this property isn't explicitly set, this property defaults to
    the lowest page ID in this wizard, or -1 if no page has been
    inserted yet.

    \sa restart(), nextId()
*/
void QWizard::setStartId(int theid)
{
    Q_D(QWizard);
    if (!d->pageMap.contains(theid)) {
        qWarning("QWizard::setStartId: Invalid page ID %d", theid);
        return;
    }
    d->start = theid;
}

int QWizard::startId() const
{
    Q_D(const QWizard);
    if (d->start != -1)
        return d->start;
    if (!d->pageMap.isEmpty())
        return d->pageMap.constBegin().key();
    return -1;
}

/*!
    Returns a pointer to the current page, or 0 if there is no current
    page (e.g., before the wizard is shown).

    This is equivalent to calling page(currentId()).

    \sa page(), currentId(), restart()
*/
QWizardPage *QWizard::currentPage() const
{
    Q_D(const QWizard);
    return page(d->current);
}

/*!
    \property QWizard::currentId
    \brief the ID of the current page

    This property cannot be set directly. To change the current page,
    call next(), back(), or restart().

    By default, this property has a value of -1, indicating that no page is
    currently shown.

    \sa currentIdChanged(), currentPage()
*/
int QWizard::currentId() const
{
    Q_D(const QWizard);
    return d->current;
}

/*!
    Sets the value of the field called \a name to \a value.

    This function can be used to set fields on any page of the wizard.

    \sa QWizardPage::registerField(), QWizardPage::setField(), field()
*/
void QWizard::setField(const QString &name, const QVariant &value)
{
    Q_D(QWizard);

    int index = d->fieldIndexMap.value(name, -1);
    if (index != -1) {
        const QWizardField &field = d->fields.at(index);
        if (!field.object->setProperty(field.property, value))
            qWarning("QWizard::setField: Couldn't write to property '%s'",
                     field.property.constData());
        return;
    }

    qWarning("QWizard::setField: No such field '%s'", qPrintable(name));
}

/*!
    Returns the value of the field called \a name.

    This function can be used to access fields on any page of the wizard.

    \sa QWizardPage::registerField(), QWizardPage::field(), setField()
*/
QVariant QWizard::field(const QString &name) const
{
    Q_D(const QWizard);

    int index = d->fieldIndexMap.value(name, -1);
    if (index != -1) {
        const QWizardField &field = d->fields.at(index);
        return field.object->property(field.property);
    }

    qWarning("QWizard::field: No such field '%s'", qPrintable(name));
    return QVariant();
}

/*!
    \property QWizard::wizardStyle
    \brief the look and feel of the wizard

    By default, QWizard uses the AeroStyle on a Windows Vista system with alpha compositing
    enabled, regardless of the current widget style. If this is not the case, the default
    wizard style depends on the current widget style as follows: MacStyle is the default if
    the current widget style is QMacStyle, ModernStyle is the default if the current widget
    style is QWindowsStyle, and ClassicStyle is the default in all other cases.

    \sa {Wizard Look and Feel}, options
*/
void QWizard::setWizardStyle(WizardStyle style)
{
    Q_D(QWizard);

    const bool styleChange = style != d->wizStyle;

#if !defined(QT_NO_STYLE_WINDOWSVISTA)
    const bool aeroStyleChange =
        d->vistaInitPending || d->vistaStateChanged || (styleChange && (style == AeroStyle || d->wizStyle == AeroStyle));
    d->vistaStateChanged = false;
    d->vistaInitPending = false;
#endif

    if (styleChange
#if !defined(QT_NO_STYLE_WINDOWSVISTA)
        || aeroStyleChange
#endif
        ) {
        d->disableUpdates();
        d->wizStyle = style;
        d->updateButtonTexts();
        d->updateLayout();
        updateGeometry();
        d->enableUpdates();
#if !defined(QT_NO_STYLE_WINDOWSVISTA)
        if (aeroStyleChange)
            d->handleAeroStyleChange();
#endif
    }
}

QWizard::WizardStyle QWizard::wizardStyle() const
{
    Q_D(const QWizard);
    return d->wizStyle;
}

/*!
    Sets the given \a option to be enabled if \a on is true;
    otherwise, clears the given \a option.

    \sa options, testOption(), setWizardStyle()
*/
void QWizard::setOption(WizardOption option, bool on)
{
    Q_D(QWizard);
    if (!(d->opts & option) != !on)
        setOptions(d->opts ^ option);
}

/*!
    Returns true if the given \a option is enabled; otherwise, returns
    false.

    \sa options, setOption(), setWizardStyle()
*/
bool QWizard::testOption(WizardOption option) const
{
    Q_D(const QWizard);
    return (d->opts & option) != 0;
}

/*!
    \property QWizard::options
    \brief the various options that affect the look and feel of the wizard

    By default, the following options are set (depending on the platform):

    \list
    \o Windows: HelpButtonOnRight.
    \o Mac OS X: NoDefaultButton and NoCancelButton.
    \o X11 and QWS (Qt for Embedded Linux): none.
    \endlist

    \sa wizardStyle
*/
void QWizard::setOptions(WizardOptions options)
{
    Q_D(QWizard);

    WizardOptions changed = (options ^ d->opts);
    if (!changed)
        return;

    d->disableUpdates();

    d->opts = options;
    if ((changed & IndependentPages) && !(d->opts & IndependentPages))
        d->cleanupPagesNotInHistory();

    if (changed & (NoDefaultButton | HaveHelpButton | HelpButtonOnRight | NoCancelButton
                   | CancelButtonOnLeft | HaveCustomButton1 | HaveCustomButton2
                   | HaveCustomButton3)) {
        d->updateButtonLayout();
    } else if (changed & (NoBackButtonOnStartPage | NoBackButtonOnLastPage
                          | HaveNextButtonOnLastPage | HaveFinishButtonOnEarlyPages
                          | DisabledBackButtonOnLastPage)) {
        d->_q_updateButtonStates();
    }

    d->enableUpdates();
    d->updateLayout();
}

QWizard::WizardOptions QWizard::options() const
{
    Q_D(const QWizard);
    return d->opts;
}

/*!
    Sets the text on button \a which to be \a text.

    By default, the text on buttons depends on the wizardStyle. For
    example, on Mac OS X, the \gui Next button is called \gui
    Continue.

    To add extra buttons to the wizard (e.g., a \gui Print button),
    one way is to call setButtonText() with CustomButton1,
    CustomButton2, or CustomButton3 to set their text, and make the
    buttons visible using the HaveCustomButton1, HaveCustomButton2,
    and/or HaveCustomButton3 options.

    Button texts may also be set on a per-page basis using QWizardPage::setButtonText().

    \sa setButton(), button(), setButtonLayout(), setOptions(), QWizardPage::setButtonText()
*/
void QWizard::setButtonText(WizardButton which, const QString &text)
{
    Q_D(QWizard);

    if (!d->ensureButton(which))
        return;

    d->buttonCustomTexts.insert(which, text);

    if (!currentPage() || !currentPage()->d_func()->buttonCustomTexts.contains(which))
        d->btns[which]->setText(text);
}

/*!
    Returns the text on button \a which.

    If a text has ben set using setButtonText(), this text is returned.

    By default, the text on buttons depends on the wizardStyle. For
    example, on Mac OS X, the \gui Next button is called \gui
    Continue.

    \sa button(), setButton(), setButtonText(), QWizardPage::buttonText(),
    QWizardPage::setButtonText()
*/
QString QWizard::buttonText(WizardButton which) const
{
    Q_D(const QWizard);

    if (!d->ensureButton(which))
        return QString();

    if (d->buttonCustomTexts.contains(which))
        return d->buttonCustomTexts.value(which);

    const QString defText = buttonDefaultText(d->wizStyle, which, d);
    if(!defText.isNull())
        return defText;

    return d->btns[which]->text();
}

/*!
    Sets the order in which buttons are displayed to \a layout, where
    \a layout is a list of \l{WizardButton}s.

    The default layout depends on the options (e.g., whether
    HelpButtonOnRight) that are set. You can call this function if
    you need more control over the buttons' layout than what \l
    options already provides.

    You can specify horizontal stretches in the layout using \l
    Stretch.

    Example:

    \snippet doc/src/snippets/code/src_gui_dialogs_qwizard.cpp 1

    \sa setButton(), setButtonText(), setOptions()
*/
void QWizard::setButtonLayout(const QList<WizardButton> &layout)
{
    Q_D(QWizard);

    for (int i = 0; i < layout.count(); ++i) {
        WizardButton button1 = layout.at(i);

        if (button1 == NoButton || button1 == Stretch)
            continue;
        if (!d->ensureButton(button1))
            return;

        // O(n^2), but n is very small
        for (int j = 0; j < i; ++j) {
            WizardButton button2 = layout.at(j);
            if (button2 == button1) {
                qWarning("QWizard::setButtonLayout: Duplicate button in layout");
                return;
            }
        }
    }

    d->buttonsHaveCustomLayout = true;
    d->buttonsCustomLayout = layout;
    d->updateButtonLayout();
}

/*!
    Sets the button corresponding to role \a which to \a button.

    To add extra buttons to the wizard (e.g., a \gui Print button),
    one way is to call setButton() with CustomButton1 to
    CustomButton3, and make the buttons visible using the
    HaveCustomButton1 to HaveCustomButton3 options.

    \sa setButtonText(), setButtonLayout(), options
*/
void QWizard::setButton(WizardButton which, QAbstractButton *button)
{
    Q_D(QWizard);

    if (uint(which) >= NButtons || d->btns[which] == button)
        return;

    if (QAbstractButton *oldButton = d->btns[which]) {
        d->buttonLayout->removeWidget(oldButton);
        delete oldButton;
    }

    d->btns[which] = button;
    if (button) {
        button->setParent(d->antiFlickerWidget);
        d->buttonCustomTexts.insert(which, button->text());
        d->connectButton(which);
    } else {
        d->buttonCustomTexts.remove(which); // ### what about page-specific texts set for 'which'
        d->ensureButton(which);             // (QWizardPage::setButtonText())? Clear them as well?
    }

    d->updateButtonLayout();
}

/*!
    Returns the button corresponding to role \a which.

    \sa setButton(), setButtonText()
*/
QAbstractButton *QWizard::button(WizardButton which) const
{
    Q_D(const QWizard);
#if !defined(QT_NO_STYLE_WINDOWSVISTA)
    if (d->wizStyle == AeroStyle && which == BackButton)
        return d->vistaHelper->backButton();
#endif
    if (!d->ensureButton(which))
        return 0;
    return d->btns[which];
}

/*!
    \property QWizard::titleFormat
    \brief the text format used by page titles

    The default format is Qt::AutoText.

    \sa QWizardPage::title, subTitleFormat
*/
void QWizard::setTitleFormat(Qt::TextFormat format)
{
    Q_D(QWizard);
    d->titleFmt = format;
    d->updateLayout();
}

Qt::TextFormat QWizard::titleFormat() const
{
    Q_D(const QWizard);
    return d->titleFmt;
}

/*!
    \property QWizard::subTitleFormat
    \brief the text format used by page subtitles

    The default format is Qt::AutoText.

    \sa QWizardPage::title, titleFormat
*/
void QWizard::setSubTitleFormat(Qt::TextFormat format)
{
    Q_D(QWizard);
    d->subTitleFmt = format;
    d->updateLayout();
}

Qt::TextFormat QWizard::subTitleFormat() const
{
    Q_D(const QWizard);
    return d->subTitleFmt;
}

/*!
    Sets the pixmap for role \a which to \a pixmap.

    The pixmaps are used by QWizard when displaying a page. Which
    pixmaps are actually used depend on the \l{Wizard Look and
    Feel}{wizard style}.

    Pixmaps can also be set for a specific page using
    QWizardPage::setPixmap().

    \sa QWizardPage::setPixmap(), {Elements of a Wizard Page}
*/
void QWizard::setPixmap(WizardPixmap which, const QPixmap &pixmap)
{
    Q_D(QWizard);
    Q_ASSERT(uint(which) < NPixmaps);
    d->defaultPixmaps[which] = pixmap;
    d->updatePixmap(which);
}

/*!
    Returns the pixmap set for role \a which.

    By default, the only pixmap that is set is the BackgroundPixmap on
    Mac OS X.

    \sa QWizardPage::pixmap(), {Elements of a Wizard Page}
*/
QPixmap QWizard::pixmap(WizardPixmap which) const
{
    Q_D(const QWizard);
    Q_ASSERT(uint(which) < NPixmaps);
#ifdef Q_WS_MAC
    if (which == BackgroundPixmap && d->defaultPixmaps[BackgroundPixmap].isNull())
        d->defaultPixmaps[BackgroundPixmap] = d->findDefaultBackgroundPixmap();
#endif
    return d->defaultPixmaps[which];
}

/*!
    Sets the default property for \a className to be \a property,
    and the associated change signal to be \a changedSignal.

    The default property is used when an instance of \a className (or
    of one of its subclasses) is passed to
    QWizardPage::registerField() and no property is specified.

    QWizard knows the most common Qt widgets. For these (or their
    subclasses), you don't need to specify a \a property or a \a
    changedSignal. The table below lists these widgets:

    \table
    \header \o Widget          \o Property                            \o Change Notification Signal
    \row    \o QAbstractButton \o bool \l{QAbstractButton::}{checked} \o \l{QAbstractButton::}{toggled()}
    \row    \o QAbstractSlider \o int \l{QAbstractSlider::}{value}    \o \l{QAbstractSlider::}{valueChanged()}
    \row    \o QComboBox       \o int \l{QComboBox::}{currentIndex}   \o \l{QComboBox::}{currentIndexChanged()}
    \row    \o QDateTimeEdit   \o QDateTime \l{QDateTimeEdit::}{dateTime} \o \l{QDateTimeEdit::}{dateTimeChanged()}
    \row    \o QLineEdit       \o QString \l{QLineEdit::}{text}       \o \l{QLineEdit::}{textChanged()}
    \row    \o QListWidget     \o int \l{QListWidget::}{currentRow}   \o \l{QListWidget::}{currentRowChanged()}
    \row    \o QSpinBox        \o int \l{QSpinBox::}{value}           \o \l{QSpinBox::}{valueChanged()}
    \endtable

    \sa QWizardPage::registerField()
*/
void QWizard::setDefaultProperty(const char *className, const char *property,
                                 const char *changedSignal)
{
    Q_D(QWizard);
    for (int i = d->defaultPropertyTable.count() - 1; i >= 0; --i) {
        if (qstrcmp(d->defaultPropertyTable.at(i).className, className) == 0) {
            d->defaultPropertyTable.remove(i);
            break;
        }
    }
    d->defaultPropertyTable.append(QWizardDefaultProperty(className, property, changedSignal));
}

/*!
    \reimp
*/
void QWizard::setVisible(bool visible)
{
    Q_D(QWizard);
    if (visible) {
        if (d->current == -1)
            restart();
    }
    QDialog::setVisible(visible);
}

/*!
    \reimp
*/
QSize QWizard::sizeHint() const
{
    Q_D(const QWizard);
    QSize result = d->mainLayout->totalSizeHint();
#ifdef Q_WS_S60
    QSize extra(QApplication::desktop()->availableGeometry(QCursor::pos()).size());
#else
    QSize extra(500, 360);
#endif
    if (d->wizStyle == MacStyle && d->current != -1) {
        QSize pixmap(currentPage()->pixmap(BackgroundPixmap).size());
        extra.setWidth(616);
        if (!pixmap.isNull()) {
            extra.setHeight(pixmap.height());

            /*
                The width isn't always reliable as a size hint, as
                some wizard backgrounds just cover the leftmost area.
                Use a rule of thumb to determine if the width is
                reliable or not.
            */
            if (pixmap.width() >= pixmap.height())
                extra.setWidth(pixmap.width());
        }
    }
    return result.expandedTo(extra);
}

/*!
    \fn void QWizard::currentIdChanged(int id)

    This signal is emitted when the current page changes, with the new
    current \a id.

    \sa currentId(), currentPage()
*/

/*!
    \fn void QWizard::helpRequested()

    This signal is emitted when the user clicks the \gui Help button.

    By default, no \gui Help button is shown. Call
    setOption(HaveHelpButton, true) to have one.

    Example:

    \snippet examples/dialogs/licensewizard/licensewizard.cpp 0
    \dots
    \snippet examples/dialogs/licensewizard/licensewizard.cpp 5
    \snippet examples/dialogs/licensewizard/licensewizard.cpp 7
    \dots
    \snippet examples/dialogs/licensewizard/licensewizard.cpp 8
    \codeline
    \snippet examples/dialogs/licensewizard/licensewizard.cpp 10
    \dots
    \snippet examples/dialogs/licensewizard/licensewizard.cpp 12
    \codeline
    \snippet examples/dialogs/licensewizard/licensewizard.cpp 14
    \codeline
    \snippet examples/dialogs/licensewizard/licensewizard.cpp 15

    \sa customButtonClicked()
*/

/*!
    \fn void QWizard::customButtonClicked(int which)

    This signal is emitted when the user clicks a custom button. \a
    which can be CustomButton1, CustomButton2, or CustomButton3.

    By default, no custom button is shown. Call setOption() with
    HaveCustomButton1, HaveCustomButton2, or HaveCustomButton3 to have
    one, and use setButtonText() or setButton() to configure it.

    \sa helpRequested()
*/

/*!
    Goes back to the previous page.

    This is equivalent to pressing the \gui Back button.

    \sa next(), accept(), reject(), restart()
*/
void QWizard::back()
{
    Q_D(QWizard);
    int n = d->history.count() - 2;
    if (n < 0)
        return;
    d->switchToPage(d->history.at(n), QWizardPrivate::Backward);
}

/*!
    Advances to the next page.

    This is equivalent to pressing the \gui Next or \gui Commit button.

    \sa nextId(), back(), accept(), reject(), restart()
*/
void QWizard::next()
{
    Q_D(QWizard);

    if (d->current == -1)
        return;

    if (validateCurrentPage()) {
        int next = nextId();
        if (next != -1) {
            if (d->history.contains(next)) {
                qWarning("QWizard::next: Page %d already met", next);