qwizard.cpp

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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), sideWidget(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 sideWidget;

    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
           && sideWidget == other.sideWidget;
}

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 QWatermarkLabel : public QLabel
{
public:
    QWatermarkLabel(QWidget *parent, QWidget *sideWidget) : QLabel(parent), m_sideWidget(sideWidget) {
        m_layout = new QVBoxLayout(this);
        if (m_sideWidget)
            m_layout->addWidget(m_sideWidget);
    }

    QSize minimumSizeHint() const {
        if (!pixmap() && !pixmap()->isNull())
            return pixmap()->size();
        return QFrame::minimumSizeHint();
    }

    void setSideWidget(QWidget *widget) {
        if (m_sideWidget == widget)
            return;
        if (m_sideWidget) {
            m_layout->removeWidget(m_sideWidget);
            m_sideWidget->hide();
        }
        m_sideWidget = widget;
        if (m_sideWidget)
            m_layout->addWidget(m_sideWidget);
    }
    QWidget *sideWidget() const {
        return m_sideWidget;
    }
private:
    QVBoxLayout *m_layout;
    QWidget *m_sideWidget;
};

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)
        , startSetByUser(false)
        , 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)
        , sideWidget(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;
    bool startSetByUser;
    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;
    QWatermarkLabel *watermarkLabel;
    QWidget *sideWidget;
    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.sideWidget = sideWidget;
    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 || info.sideWidget) && (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 || info.sideWidget) {
        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 || info.sideWidget) && !watermarkLabel) {
        watermarkLabel = new QWatermarkLabel(antiFlickerWidget, sideWidget);
        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 || info.sideWidget) {
        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 || info.sideWidget);

    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 || info.sideWidget) {
        QPixmap pix;
        if (info.watermark) {
            if (page)
                pix = page->pixmap(QWizard::WatermarkPixmap);
            else
                pix = q->pixmap(QWizard::WatermarkPixmap);
        }
        watermarkLabel->setPixmap(pix); // in case there is no watermark and we show the side widget we need to clear the watermark
    }

    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 && !info.sideWidget) {
        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();
}

static QString object_name_for_button(QWizard::WizardButton which)
{
    switch (which) {
    case QWizard::CommitButton:
        return QLatin1String("qt_wizard_") + QLatin1String("commit");
    case QWizard::FinishButton:
        return QLatin1String("qt_wizard_") + QLatin1String("finish");
    case QWizard::CancelButton:
        return QLatin1String("qt_wizard_") + QLatin1String("cancel");
    case QWizard::BackButton:
    case QWizard::NextButton:
    case QWizard::HelpButton:
    case QWizard::CustomButton1:
    case QWizard::CustomButton2:
    case QWizard::CustomButton3:
        // Make navigation buttons detectable as passive interactor in designer
        return QLatin1String("__qt__passive_wizardbutton") + QString::number(which);
    case QWizard::Stretch:
    case QWizard::NoButton:
    //case QWizard::NStandardButtons:
    //case QWizard::NButtons:
        ;
    }
    //Q_UNREACHABLE();
    return QString();
}

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);
        pushButton->setObjectName(object_name_for_button(which));
#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)
{
    int destroyed_index = -1;
    QVector<QWizardField>::iterator it = fields.begin();
    while (it != fields.end()) {
        const QWizardField &field = *it;
        if (field.object == object) {
            destroyed_index = fieldIndexMap.value(field.name, -1);
            fieldIndexMap.remove(field.name);
            it = fields.erase(it);
        } else {
            ++it;
        }
    }
    if (destroyed_index != -1) {
        QMap<QString, int>::iterator it2 = fieldIndexMap.begin();
        while (it2 != fieldIndexMap.end()) {
            int index = it2.value();
            if (index > destroyed_index) {
                QString field_name = it2.key();
                fieldIndexMap.insert(field_name, index-1);
            }
            ++it2;
        }
    }
}

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

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
}

QWizard::~QWizard()
{
    Q_D(QWizard);
    delete d->buttonLayout;
}

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;
}

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);

    if (!d->startSetByUser && d->pageMap.constBegin().key() == theid)
        d->start = theid;
    emit pageAdded(theid);
}

void QWizard::removePage(int id)
{
    Q_D(QWizard);

    QWizardPage *removedPage = 0;

    // update startItem accordingly
    if (d->pageMap.count() > 0) { // only if we have any pages
        if (d->start == id) {
            const int firstId = d->pageMap.constBegin().key();
            if (firstId == id) {
                if (d->pageMap.count() > 1)
                    d->start = (++d->pageMap.constBegin()).key(); // secondId
                else
                    d->start = -1; // removing the last page
            } else { // startSetByUser has to be "true" here
                d->start = firstId;
            }
            d->startSetByUser = false;
        }
    }

    if (d->pageMap.contains(id))
        emit pageRemoved(id);

    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);
            }
        }
    }
}

QWizardPage *QWizard::page(int theid) const
{
    Q_D(const QWizard);
    return d->pageMap.value(theid);
}

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

QList<int> QWizard::visitedPages() const
{
    Q_D(const QWizard);
    return d->history;
}

QList<int> QWizard::pageIds() const
{
  Q_D(const QWizard);
  return d->pageMap.keys();
}

void QWizard::setStartId(int theid)
{
    Q_D(QWizard);
    int newStart = theid;
    if (theid == -1)
        newStart = d->pageMap.count() ? d->pageMap.constBegin().key() : -1;

    if (d->start == newStart) {
        d->startSetByUser = theid != -1;
        return;
    }

    if (!d->pageMap.contains(newStart)) {
        qWarning("QWizard::setStartId: Invalid page ID %d", newStart);
        return;
    }
    d->start = newStart;
    d->startSetByUser = theid != -1;
}

int QWizard::startId() const
{
    Q_D(const QWizard);
    return d->start;
}

QWizardPage *QWizard::currentPage() const
{
    Q_D(const QWizard);
    return page(d->current);
}

int QWizard::currentId() const
{
    Q_D(const QWizard);
    return d->current;
}

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));
}

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();
}

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;
}

void QWizard::setOption(WizardOption option, bool on)
{
    Q_D(QWizard);
    if (!(d->opts & option) != !on)
        setOptions(d->opts ^ option);
}

bool QWizard::testOption(WizardOption option) const
{
    Q_D(const QWizard);
    return (d->opts & option) != 0;
}

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;
}

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);
}

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();
}

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();
}

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();
}

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];
}

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;
}

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;
}

void QWizard::setPixmap(WizardPixmap which, const QPixmap &pixmap)
{
    Q_D(QWizard);
    Q_ASSERT(uint(which) < NPixmaps);
    d->defaultPixmaps[which] = pixmap;
    d->updatePixmap(which);
}

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];
}

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));
}

void QWizard::setSideWidget(QWidget *widget)
{
    Q_D(QWizard);

    d->sideWidget = widget;
    if (d->watermarkLabel) {
        d->watermarkLabel->setSideWidget(widget);
        d->updateLayout();
    }
}

QWidget *QWizard::sideWidget() const
{
    Q_D(const QWizard);

    return d->sideWidget;
}

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

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);
}

void QWizard::back()
{
    Q_D(QWizard);
    int n = d->history.count() - 2;
    if (n < 0)
        return;
    d->switchToPage(d->history.at(n), QWizardPrivate::Backward);
}

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);
                return;
            }
            if (!d->pageMap.contains(next)) {
                qWarning("QWizard::next: No such page %d", next);
                return;
            }
            d->switchToPage(next, QWizardPrivate::Forward);
        }
    }
}

void QWizard::restart()
{
    Q_D(QWizard);
    d->disableUpdates();
    d->reset();
    d->switchToPage(startId(), QWizardPrivate::Forward);
    d->enableUpdates();
}

bool QWizard::event(QEvent *event)
{
    Q_D(QWizard);
    if (event->type() == QEvent::StyleChange) { // Propagate style
        d->setStyle(style());
        d->updateLayout();
    }
#if !defined(QT_NO_STYLE_WINDOWSVISTA)
    else if (event->type() == QEvent::Show && d->vistaInitPending) {
        d->vistaInitPending = false;
        d->wizStyle = AeroStyle;
        d->handleAeroStyleChange();
    }
    else if (d->isVistaThemeEnabled()) {
        if (event->type() == QEvent::Resize
                || event->type() == QEvent::LayoutDirectionChange) {
            const int buttonLeft = (layoutDirection() == Qt::RightToLeft
                                    ? width() - d->vistaHelper->backButton()->sizeHint().width()
                                    : 0);

            d->vistaHelper->backButton()->move(buttonLeft,
                                               d->vistaHelper->backButton()->y());
        }

        d->vistaHelper->mouseEvent(event);
    }
#endif
    return QDialog::event(event);
}

void QWizard::resizeEvent(QResizeEvent *event)
{
    Q_D(QWizard);
    int heightOffset = 0;
#if !defined(QT_NO_STYLE_WINDOWSVISTA)
    if (d->isVistaThemeEnabled()) {
        heightOffset = d->vistaHelper->topOffset();
        if (d->isVistaThemeEnabled(QVistaHelper::VistaAero))
            heightOffset += d->vistaHelper->titleBarSize();
    }
#endif
    d->antiFlickerWidget->resize(event->size().width(), event->size().height() - heightOffset);
#if !defined(QT_NO_STYLE_WINDOWSVISTA)
    if (d->isVistaThemeEnabled())
        d->vistaHelper->resizeEvent(event);
#endif
    QDialog::resizeEvent(event);
}

void QWizard::paintEvent(QPaintEvent * event)
{
    Q_D(QWizard);
    if (d->wizStyle == MacStyle && currentPage()) {
        QPixmap backgroundPixmap = currentPage()->pixmap(BackgroundPixmap);
        if (backgroundPixmap.isNull())
            return;

        QPainter painter(this);
        painter.drawPixmap(0, (height() - backgroundPixmap.height()) / 2, backgroundPixmap);
    }
#if !defined(QT_NO_STYLE_WINDOWSVISTA)
    else if (d->isVistaThemeEnabled()) {
        if (d->isVistaThemeEnabled(QVistaHelper::VistaBasic)) {
            QPainter painter(this);
            QColor color = d->vistaHelper->basicWindowFrameColor();
            painter.fillRect(0, 0, width(), QVistaHelper::topOffset(), color);
        }
        d->vistaHelper->paintEvent(event);
    }
#else
    Q_UNUSED(event);
#endif
}

#if defined(Q_WS_WIN)

bool QWizard::winEvent(MSG *message, long *result)
{
#if !defined(QT_NO_STYLE_WINDOWSVISTA)
    Q_D(QWizard);
    if (d->isVistaThemeEnabled()) {
        const bool winEventResult = d->vistaHelper->handleWinEvent(message, result);
        if (QVistaHelper::vistaState() != d->vistaState) {
            d->vistaState = QVistaHelper::vistaState();
            d->vistaStateChanged = true;
            setWizardStyle(AeroStyle);
        }
        return winEventResult;
    } else {
        return QDialog::winEvent(message, result);
    }
#else
    return QDialog::winEvent(message, result);
#endif
}
#endif

void QWizard::done(int result)
{
    Q_D(QWizard);
    // canceling leaves the wizard in a known state
    if (result == Rejected) {
        d->reset();
    } else {
        if (!validateCurrentPage())
            return;
    }
    QDialog::done(result);
}

void QWizard::initializePage(int theid)
{
    QWizardPage *page = this->page(theid);
    if (page)
        page->initializePage();
}

void QWizard::cleanupPage(int theid)
{
    QWizardPage *page = this->page(theid);
    if (page)
        page->cleanupPage();
}

bool QWizard::validateCurrentPage()
{
    QWizardPage *page = currentPage();
    if (!page)
        return true;

    return page->validatePage();
}

int QWizard::nextId() const
{
    const QWizardPage *page = currentPage();
    if (!page)
        return -1;

    return page->nextId();
}

QWizardPage::QWizardPage(QWidget *parent)
    : QWidget(*new QWizardPagePrivate, parent, 0)
{
    connect(this, SIGNAL(completeChanged()), this, SLOT(_q_updateCachedCompleteState()));
}

void QWizardPage::setTitle(const QString &title)
{
    Q_D(QWizardPage);
    d->title = title;
    if (d->wizard && d->wizard->currentPage() == this)
        d->wizard->d_func()->updateLayout();
}

QString QWizardPage::title() const
{
    Q_D(const QWizardPage);
    return d->title;
}

void QWizardPage::setSubTitle(const QString &subTitle)
{
    Q_D(QWizardPage);
    d->subTitle = subTitle;
    if (d->wizard && d->wizard->currentPage() == this)
        d->wizard->d_func()->updateLayout();
}

QString QWizardPage::subTitle() const
{
    Q_D(const QWizardPage);
    return d->subTitle;
}

void QWizardPage::setPixmap(QWizard::WizardPixmap which, const QPixmap &pixmap)
{
    Q_D(QWizardPage);
    Q_ASSERT(uint(which) < QWizard::NPixmaps);
    d->pixmaps[which] = pixmap;
    if (d->wizard && d->wizard->currentPage() == this)
        d->wizard->d_func()->updatePixmap(which);
}

QPixmap QWizardPage::pixmap(QWizard::WizardPixmap which) const
{
    Q_D(const QWizardPage);
    Q_ASSERT(uint(which) < QWizard::NPixmaps);

    const QPixmap &pixmap = d->pixmaps[which];
    if (!pixmap.isNull())
        return pixmap;

    if (wizard())
        return wizard()->pixmap(which);

    return pixmap;
}

void QWizardPage::initializePage()
{
}

void QWizardPage::cleanupPage()
{
    Q_D(QWizardPage);
    if (d->wizard) {
        QVector<QWizardField> &fields = d->wizard->d_func()->fields;
        for (int i = 0; i < fields.count(); ++i) {
            const QWizardField &field = fields.at(i);
            if (field.page == this)
                field.object->setProperty(field.property, field.initialValue);
        }
    }
}

bool QWizardPage::validatePage()
{
    return true;
}

bool QWizardPage::isComplete() const
{
    Q_D(const QWizardPage);

    if (!d->wizard)
        return true;

    const QVector<QWizardField> &wizardFields = d->wizard->d_func()->fields;
    for (int i = wizardFields.count() - 1; i >= 0; --i) {
        const QWizardField &field = wizardFields.at(i);
        if (field.page == this && field.mandatory) {
            QVariant value = field.object->property(field.property);
            if (value == field.initialValue)
                return false;

#ifndef QT_NO_LINEEDIT
            if (QLineEdit *lineEdit = qobject_cast<QLineEdit *>(field.object)) {
                if (!lineEdit->hasAcceptableInput())
                    return false;
            }
#endif
#ifndef QT_NO_SPINBOX
            if (QAbstractSpinBox *spinBox = qobject_cast<QAbstractSpinBox *>(field.object)) {
                if (!spinBox->hasAcceptableInput())
                    return false;
            }
#endif
        }
    }
    return true;
}

void QWizardPage::setFinalPage(bool finalPage)
{
    Q_D(QWizardPage);
    d->explicitlyFinal = finalPage;
    QWizard *wizard = this->wizard();
    if (wizard && wizard->currentPage() == this)
        wizard->d_func()->updateCurrentPage();
}

bool QWizardPage::isFinalPage() const
{
    Q_D(const QWizardPage);
    if (d->explicitlyFinal)
        return true;

    QWizard *wizard = this->wizard();
    if (wizard && wizard->currentPage() == this) {
        // try to use the QWizard implementation if possible
        return wizard->nextId() == -1;
    } else {
        return nextId() == -1;
    }
}

void QWizardPage::setCommitPage(bool commitPage)
{
    Q_D(QWizardPage);
    d->commit = commitPage;
    QWizard *wizard = this->wizard();
    if (wizard && wizard->currentPage() == this)
        wizard->d_func()->updateCurrentPage();
}

bool QWizardPage::isCommitPage() const
{
    Q_D(const QWizardPage);
    return d->commit;
}

void QWizardPage::setButtonText(QWizard::WizardButton which, const QString &text)
{
    Q_D(QWizardPage);
    d->buttonCustomTexts.insert(which, text);
    if (wizard() && wizard()->currentPage() == this && wizard()->d_func()->btns[which])
        wizard()->d_func()->btns[which]->setText(text);
}

QString QWizardPage::buttonText(QWizard::WizardButton which) const
{
    Q_D(const QWizardPage);

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

    if (wizard())
        return wizard()->buttonText(which);

    return QString();
}

int QWizardPage::nextId() const
{
    Q_D(const QWizardPage);

    if (!d->wizard)
        return -1;

    bool foundCurrentPage = false;

    const QWizardPrivate::PageMap &pageMap = d->wizard->d_func()->pageMap;
    QWizardPrivate::PageMap::const_iterator i = pageMap.constBegin();
    QWizardPrivate::PageMap::const_iterator end = pageMap.constEnd();

    for (; i != end; ++i) {
        if (i.value() == this) {
            foundCurrentPage = true;
        } else if (foundCurrentPage) {
            return i.key();
        }
    }
    return -1;
}

void QWizardPage::setField(const QString &name, const QVariant &value)
{
    Q_D(QWizardPage);
    if (!d->wizard)
        return;
    d->wizard->setField(name, value);
}

QVariant QWizardPage::field(const QString &name) const
{
    Q_D(const QWizardPage);
    if (!d->wizard)
        return QVariant();
    return d->wizard->field(name);
}

void QWizardPage::registerField(const QString &name, QWidget *widget, const char *property,
                                const char *changedSignal)
{
    Q_D(QWizardPage);
    QWizardField field(this, name, widget, property, changedSignal);
    if (d->wizard) {
        d->wizard->d_func()->addField(field);
    } else {
        d->pendingFields += field;
    }
}

QWizard *QWizardPage::wizard() const
{
    Q_D(const QWizardPage);
    return d->wizard;
}

QT_END_NAMESPACE

#include "moc_qwizard.cpp"

#endif // QT_NO_WIZARD