qcalendarwidget.cpp

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#include "qcalendarwidget.h"

#ifndef QT_NO_CALENDARWIDGET

#include <qabstractitemmodel.h>
#include <qitemdelegate.h>
#include <qdatetime.h>
#include <qtableview.h>
#include <qlayout.h>
#include <qevent.h>
#include <qtextformat.h>
#include <qheaderview.h>
#include <private/qwidget_p.h>
#include <qpushbutton.h>
#include <qtoolbutton.h>
#include <qlabel.h>
#include <qspinbox.h>
#include <qmenu.h>
#include <qapplication.h>
#include <qbasictimer.h>
#include <qstylepainter.h>
#include <private/qcalendartextnavigator_p.h>

QT_BEGIN_NAMESPACE

enum {
    RowCount = 6,
    ColumnCount = 7,
    HeaderColumn = 0,
    HeaderRow = 0,
    MinimumDayOffset = 1
};

class QCalendarDateSectionValidator
{
public:

    enum Section {
        NextSection,
        ThisSection,
        PrevSection
    };

    QCalendarDateSectionValidator() {}
    virtual ~QCalendarDateSectionValidator() {}
    virtual Section handleKey(int key) = 0;
    virtual QDate applyToDate(const QDate &date) const = 0;
    virtual void setDate(const QDate &date) = 0;
    virtual QString text() const = 0;
    virtual QString text(const QDate &date, int repeat) const = 0;

    QLocale m_locale;

protected:
    QString highlightString(const QString &str, int pos) const;
private:
};

QString QCalendarDateSectionValidator::highlightString(const QString &str, int pos) const
{
    if (pos == 0)
        return QLatin1String("<b>") + str + QLatin1String("</b>");
    int startPos = str.length() - pos;
    return str.mid(0, startPos) + QLatin1String("<b>") + str.mid(startPos, pos) + QLatin1String("</b>");

}

class QCalendarDayValidator : public QCalendarDateSectionValidator
{

public:
    QCalendarDayValidator();
    virtual Section handleKey(int key);
    virtual QDate applyToDate(const QDate &date) const;
    virtual void setDate(const QDate &date);
    virtual QString text() const;
    virtual QString text(const QDate &date, int repeat) const;
private:
    int m_pos;
    int m_day;
    int m_oldDay;
};

QCalendarDayValidator::QCalendarDayValidator()
    : QCalendarDateSectionValidator(), m_pos(0), m_day(1), m_oldDay(1)
{
}

QCalendarDateSectionValidator::Section QCalendarDayValidator::handleKey(int key)
{
    if (key == Qt::Key_Right || key == Qt::Key_Left) {
        m_pos = 0;
        return QCalendarDateSectionValidator::ThisSection;
    } else if (key == Qt::Key_Up) {
        m_pos = 0;
        ++m_day;
        if (m_day > 31)
            m_day = 1;
        return QCalendarDateSectionValidator::ThisSection;
    } else if (key == Qt::Key_Down) {
        m_pos = 0;
        --m_day;
        if (m_day < 1)
            m_day = 31;
        return QCalendarDateSectionValidator::ThisSection;
    } else if (key == Qt::Key_Back || key == Qt::Key_Backspace) {
        --m_pos;
        if (m_pos < 0)
            m_pos = 1;

        if (m_pos == 0)
            m_day = m_oldDay;
        else
            m_day = m_day / 10;
            //m_day = m_oldDay / 10 * 10 + m_day / 10;

        if (m_pos == 0)
            return QCalendarDateSectionValidator::PrevSection;
        return QCalendarDateSectionValidator::ThisSection;
    }
    if (key < Qt::Key_0 || key > Qt::Key_9)
        return QCalendarDateSectionValidator::ThisSection;
    int pressedKey = key - Qt::Key_0;
    if (m_pos == 0)
        m_day = pressedKey;
    else
        m_day = m_day % 10 * 10 + pressedKey;
    if (m_day > 31)
        m_day = 31;
    ++m_pos;
    if (m_pos > 1) {
        m_pos = 0;
        return QCalendarDateSectionValidator::NextSection;
    }
    return QCalendarDateSectionValidator::ThisSection;
}

QDate QCalendarDayValidator::applyToDate(const QDate &date) const
{
    int day = m_day;
    if (day < 1)
        day = 1;
    else if (day > 31)
        day = 31;
    if (day > date.daysInMonth())
        day = date.daysInMonth();
    return QDate(date.year(), date.month(), day);
}

void QCalendarDayValidator::setDate(const QDate &date)
{
    m_day = m_oldDay = date.day();
    m_pos = 0;
}

QString QCalendarDayValidator::text() const
{
    QString str;
    if (m_day / 10 == 0)
        str += QLatin1Char('0');
    str += QString::number(m_day);
    return highlightString(str, m_pos);
}

QString QCalendarDayValidator::text(const QDate &date, int repeat) const
{
    if (repeat <= 1) {
        return QString::number(date.day());
    } else if (repeat == 2) {
        QString str;
        if (date.day() / 10 == 0)
            str += QLatin1Char('0');
        return str + QString::number(date.day());
    } else if (repeat == 3) {
        return m_locale.dayName(date.dayOfWeek(), QLocale::ShortFormat);
    } else if (repeat >= 4) {
        return m_locale.dayName(date.dayOfWeek(), QLocale::LongFormat);
    }
    return QString();
}


class QCalendarMonthValidator : public QCalendarDateSectionValidator
{

public:
    QCalendarMonthValidator();
    virtual Section handleKey(int key);
    virtual QDate applyToDate(const QDate &date) const;
    virtual void setDate(const QDate &date);
    virtual QString text() const;
    virtual QString text(const QDate &date, int repeat) const;
private:
    int m_pos;
    int m_month;
    int m_oldMonth;
};

QCalendarMonthValidator::QCalendarMonthValidator()
    : QCalendarDateSectionValidator(), m_pos(0), m_month(1), m_oldMonth(1)
{
}

QCalendarDateSectionValidator::Section QCalendarMonthValidator::handleKey(int key)
{
    if (key == Qt::Key_Right || key == Qt::Key_Left) {
        m_pos = 0;
        return QCalendarDateSectionValidator::ThisSection;
    } else if (key == Qt::Key_Up) {
        m_pos = 0;
        ++m_month;
        if (m_month > 12)
            m_month = 1;
        return QCalendarDateSectionValidator::ThisSection;
    } else if (key == Qt::Key_Down) {
        m_pos = 0;
        --m_month;
        if (m_month < 1)
            m_month = 12;
        return QCalendarDateSectionValidator::ThisSection;
    } else if (key == Qt::Key_Back || key == Qt::Key_Backspace) {
        --m_pos;
        if (m_pos < 0)
            m_pos = 1;

        if (m_pos == 0)
            m_month = m_oldMonth;
        else
            m_month = m_month / 10;
            //m_month = m_oldMonth / 10 * 10 + m_month / 10;

        if (m_pos == 0)
            return QCalendarDateSectionValidator::PrevSection;
        return QCalendarDateSectionValidator::ThisSection;
    }
    if (key < Qt::Key_0 || key > Qt::Key_9)
        return QCalendarDateSectionValidator::ThisSection;
    int pressedKey = key - Qt::Key_0;
    if (m_pos == 0)
        m_month = pressedKey;
    else
        m_month = m_month % 10 * 10 + pressedKey;
    if (m_month > 12)
        m_month = 12;
    ++m_pos;
    if (m_pos > 1) {
        m_pos = 0;
        return QCalendarDateSectionValidator::NextSection;
    }
    return QCalendarDateSectionValidator::ThisSection;
}

QDate QCalendarMonthValidator::applyToDate(const QDate &date) const
{
    int month = m_month;
    if (month < 1)
        month = 1;
    else if (month > 12)
        month = 12;
    QDate newDate(date.year(), m_month, 1);
    int day = date.day();
    if (day > newDate.daysInMonth())
        day = newDate.daysInMonth();
    return QDate(date.year(), month, day);
}

void QCalendarMonthValidator::setDate(const QDate &date)
{
    m_month = m_oldMonth = date.month();
    m_pos = 0;
}

QString QCalendarMonthValidator::text() const
{
    QString str;
    if (m_month / 10 == 0)
        str += QLatin1Char('0');
    str += QString::number(m_month);
    return highlightString(str, m_pos);
}

QString QCalendarMonthValidator::text(const QDate &date, int repeat) const
{
    if (repeat <= 1) {
        return QString::number(date.month());
    } else if (repeat == 2) {
        QString str;
        if (date.month() / 10 == 0)
            str += QLatin1Char('0');
        return str + QString::number(date.month());
    } else if (repeat == 3) {
        return m_locale.standaloneMonthName(date.month(), QLocale::ShortFormat);
    } else /*if (repeat >= 4)*/ {
        return m_locale.standaloneMonthName(date.month(), QLocale::LongFormat);
    }
}


class QCalendarYearValidator : public QCalendarDateSectionValidator
{

public:
    QCalendarYearValidator();
    virtual Section handleKey(int key);
    virtual QDate applyToDate(const QDate &date) const;
    virtual void setDate(const QDate &date);
    virtual QString text() const;
    virtual QString text(const QDate &date, int repeat) const;
private:
    int pow10(int n);
    int m_pos;
    int m_year;
    int m_oldYear;
};

QCalendarYearValidator::QCalendarYearValidator()
    : QCalendarDateSectionValidator(), m_pos(0), m_year(2000), m_oldYear(2000)
{
}

int QCalendarYearValidator::pow10(int n)
{
    int power = 1;
    for (int i = 0; i < n; i++)
        power *= 10;
    return power;
}

QCalendarDateSectionValidator::Section QCalendarYearValidator::handleKey(int key)
{
    if (key == Qt::Key_Right || key == Qt::Key_Left) {
        m_pos = 0;
        return QCalendarDateSectionValidator::ThisSection;
    } else if (key == Qt::Key_Up) {
        m_pos = 0;
        ++m_year;
        return QCalendarDateSectionValidator::ThisSection;
    } else if (key == Qt::Key_Down) {
        m_pos = 0;
        --m_year;
        return QCalendarDateSectionValidator::ThisSection;
    } else if (key == Qt::Key_Back || key == Qt::Key_Backspace) {
        --m_pos;
        if (m_pos < 0)
            m_pos = 3;

        int pow = pow10(m_pos);
        m_year = m_oldYear / pow * pow + m_year % (pow * 10) / 10;

        if (m_pos == 0)
            return QCalendarDateSectionValidator::PrevSection;
        return QCalendarDateSectionValidator::ThisSection;
    }
    if (key < Qt::Key_0 || key > Qt::Key_9)
        return QCalendarDateSectionValidator::ThisSection;
    int pressedKey = key - Qt::Key_0;
    int pow = pow10(m_pos);
    m_year = m_year / (pow * 10) * (pow * 10) + m_year % pow * 10 + pressedKey;
    ++m_pos;
    if (m_pos > 3) {
        m_pos = 0;
        return QCalendarDateSectionValidator::NextSection;
    }
    return QCalendarDateSectionValidator::ThisSection;
}

QDate QCalendarYearValidator::applyToDate(const QDate &date) const
{
    int year = m_year;
    if (year < 1)
        year = 1;
    QDate newDate(year, date.month(), 1);
    int day = date.day();
    if (day > newDate.daysInMonth())
        day = newDate.daysInMonth();
    return QDate(year, date.month(), day);
}

void QCalendarYearValidator::setDate(const QDate &date)
{
    m_year = m_oldYear = date.year();
    m_pos = 0;
}

QString QCalendarYearValidator::text() const
{
    QString str;
    int pow = 10;
    for (int i = 0; i < 3; i++) {
        if (m_year / pow == 0)
            str += QLatin1Char('0');
        pow *= 10;
    }
    str += QString::number(m_year);
    return highlightString(str, m_pos);
}

QString QCalendarYearValidator::text(const QDate &date, int repeat) const
{
    if (repeat < 4) {
        QString str;
        int year = date.year() % 100;
        if (year / 10 == 0)
            str = QLatin1Char('0');
        return str + QString::number(year);
    }
    return QString::number(date.year());
}


class QCalendarDateValidator
{
public:
    QCalendarDateValidator();
    ~QCalendarDateValidator();

    void handleKeyEvent(QKeyEvent *keyEvent);
    QString currentText() const;
    QDate currentDate() const { return m_currentDate; }
    void setFormat(const QString &format);
    void setInitialDate(const QDate &date);

    void setLocale(const QLocale &locale);

private:

    struct SectionToken {
        SectionToken(QCalendarDateSectionValidator *val, int rep) : validator(val), repeat(rep) {}
        QCalendarDateSectionValidator *validator;
        int repeat;
    };

    void toNextToken();
    void toPreviousToken();
    void applyToDate();

    int countRepeat(const QString &str, int index) const;
    void clear();

    QStringList m_separators;
    QList<SectionToken *> m_tokens;
    QCalendarDateSectionValidator *m_yearValidator;
    QCalendarDateSectionValidator *m_monthValidator;
    QCalendarDateSectionValidator *m_dayValidator;

    SectionToken *m_currentToken;

    QDate m_initialDate;
    QDate m_currentDate;

    QCalendarDateSectionValidator::Section m_lastSectionMove;
};

QCalendarDateValidator::QCalendarDateValidator()
    : m_currentToken(0), m_lastSectionMove(QCalendarDateSectionValidator::ThisSection)
{
    m_initialDate = m_currentDate = QDate::currentDate();
    m_yearValidator = new QCalendarYearValidator();
    m_monthValidator = new QCalendarMonthValidator();
    m_dayValidator = new QCalendarDayValidator();
}

void QCalendarDateValidator::setLocale(const QLocale &locale)
{
    m_yearValidator->m_locale = locale;
    m_monthValidator->m_locale = locale;
    m_dayValidator->m_locale = locale;
}

QCalendarDateValidator::~QCalendarDateValidator()
{
    delete m_yearValidator;
    delete m_monthValidator;
    delete m_dayValidator;
    clear();
}

// from qdatetime.cpp
int QCalendarDateValidator::countRepeat(const QString &str, int index) const
{
    Q_ASSERT(index >= 0 && index < str.size());
    int count = 1;
    const QChar ch = str.at(index);
    while (index + count < str.size() && str.at(index + count) == ch)
        ++count;
    return count;
}

void QCalendarDateValidator::setInitialDate(const QDate &date)
{
    m_yearValidator->setDate(date);
    m_monthValidator->setDate(date);
    m_dayValidator->setDate(date);
    m_initialDate = date;
    m_currentDate = date;
    m_lastSectionMove = QCalendarDateSectionValidator::ThisSection;
}

QString QCalendarDateValidator::currentText() const
{
    QString str;
    QStringListIterator itSep(m_separators);
    QListIterator<SectionToken *> itTok(m_tokens);
    while (itSep.hasNext()) {
        str += itSep.next();
        if (itTok.hasNext()) {
            SectionToken *token = itTok.next();
            QCalendarDateSectionValidator *validator = token->validator;
            if (m_currentToken == token)
                str += validator->text();
            else
                str += validator->text(m_currentDate, token->repeat);
        }
    }
    return str;
}

void QCalendarDateValidator::clear()
{
    QListIterator<SectionToken *> it(m_tokens);
    while (it.hasNext())
        delete it.next();

    m_tokens.clear();
    m_separators.clear();

    m_currentToken = 0;
}

void QCalendarDateValidator::setFormat(const QString &format)
{
    clear();

    int pos = 0;
    const QLatin1Char quote('\'');
    bool quoting = false;
    QString separator;
    while (pos < format.size()) {
        QString mid = format.mid(pos);
        int offset = 1;

        if (mid.startsWith(quote)) {
            quoting = !quoting;
        } else {
            const QChar nextChar = format.at(pos);
            if (quoting) {
                separator += nextChar;
            } else {
                SectionToken *token = 0;
                if (nextChar == QLatin1Char('d')) {
                    offset = qMin(4, countRepeat(format, pos));
                    token = new SectionToken(m_dayValidator, offset);
                } else if (nextChar == QLatin1Char('M')) {
                    offset = qMin(4, countRepeat(format, pos));
                    token = new SectionToken(m_monthValidator, offset);
                } else if (nextChar == QLatin1Char('y')) {
                    offset = qMin(4, countRepeat(format, pos));
                    token = new SectionToken(m_yearValidator, offset);
                } else {
                    separator += nextChar;
                }
                if (token) {
                    m_tokens.append(token);
                    m_separators.append(separator);
                    separator = QString();
                    if (!m_currentToken)
                        m_currentToken = token;

                }
            }
        }
        pos += offset;
    }
    m_separators += separator;
}

void QCalendarDateValidator::applyToDate()
{
    m_currentDate = m_yearValidator->applyToDate(m_currentDate);
    m_currentDate = m_monthValidator->applyToDate(m_currentDate);
    m_currentDate = m_dayValidator->applyToDate(m_currentDate);
}

void QCalendarDateValidator::toNextToken()
{
    const int idx = m_tokens.indexOf(m_currentToken);
    if (idx == -1)
        return;
    if (idx + 1 >= m_tokens.count())
        m_currentToken = m_tokens.first();
    else
        m_currentToken = m_tokens.at(idx + 1);
}

void QCalendarDateValidator::toPreviousToken()
{
    const int idx = m_tokens.indexOf(m_currentToken);
    if (idx == -1)
        return;
    if (idx - 1 < 0)
        m_currentToken = m_tokens.last();
    else
        m_currentToken = m_tokens.at(idx - 1);
}

void QCalendarDateValidator::handleKeyEvent(QKeyEvent *keyEvent)
{
    if (!m_currentToken)
        return;

    int key = keyEvent->key();
    if (m_lastSectionMove == QCalendarDateSectionValidator::NextSection) {
        if (key == Qt::Key_Back || key == Qt::Key_Backspace)
            toPreviousToken();
    }
    if (key == Qt::Key_Right)
        toNextToken();
    else if (key == Qt::Key_Left)
        toPreviousToken();

    m_lastSectionMove = m_currentToken->validator->handleKey(key);

    applyToDate();
    if (m_lastSectionMove == QCalendarDateSectionValidator::NextSection)
        toNextToken();
    else if (m_lastSectionMove == QCalendarDateSectionValidator::PrevSection)
        toPreviousToken();
}

QWidget *QCalendarTextNavigator::widget() const
{
    return m_widget;
}

void QCalendarTextNavigator::setWidget(QWidget *widget)
{
    m_widget = widget;
}

QDate QCalendarTextNavigator::date() const
{
    return m_date;
}

void QCalendarTextNavigator::setDate(const QDate &date)
{
    m_date = date;
}

void QCalendarTextNavigator::updateDateLabel()
{
    if (!m_widget)
        return;

    m_acceptTimer.start(m_editDelay, this);

    m_dateText->setText(m_dateValidator->currentText());

    QSize s = m_dateFrame->sizeHint();
    QRect r = m_widget->geometry(); // later, just the table section
    QRect newRect((r.width() - s.width()) / 2, (r.height() - s.height()) / 2, s.width(), s.height());
    m_dateFrame->setGeometry(newRect);
    // need to set palette after geometry update as phonestyle sets transparency
    // effect in move event.
    QPalette p = m_dateFrame->palette();
    p.setBrush(QPalette::Window, m_dateFrame->window()->palette().brush(QPalette::Window));
    m_dateFrame->setPalette(p);

    m_dateFrame->raise();
    m_dateFrame->show();
}

void QCalendarTextNavigator::applyDate()
{
    QDate date = m_dateValidator->currentDate();
    if (m_date == date)
        return;

    m_date = date;
    emit dateChanged(date);
}

void QCalendarTextNavigator::createDateLabel()
{
    if (m_dateFrame)
        return;
    m_dateFrame = new QFrame(m_widget);
    QVBoxLayout *vl = new QVBoxLayout;
    m_dateText = new QLabel;
    vl->addWidget(m_dateText);
    m_dateFrame->setLayout(vl);
    m_dateFrame->setFrameShadow(QFrame::Plain);
    m_dateFrame->setFrameShape(QFrame::Box);
    m_dateValidator = new QCalendarDateValidator();
    m_dateValidator->setLocale(m_widget->locale());
    m_dateValidator->setFormat(m_widget->locale().dateFormat(QLocale::ShortFormat));
    m_dateValidator->setInitialDate(m_date);

    m_dateFrame->setAutoFillBackground(true);
    m_dateFrame->setBackgroundRole(QPalette::Window);
}

void QCalendarTextNavigator::removeDateLabel()
{
    if (!m_dateFrame)
        return;
    m_acceptTimer.stop();
    m_dateFrame->hide();
    m_dateFrame->deleteLater();
    delete m_dateValidator;
    m_dateFrame = 0;
    m_dateText = 0;
    m_dateValidator = 0;
}

bool QCalendarTextNavigator::eventFilter(QObject *o, QEvent *e)
{
    if (m_widget) {
        if (e->type() == QEvent::KeyPress || e->type() == QEvent::KeyRelease) {
            QKeyEvent* ke = (QKeyEvent*)e;
            if ((ke->text().length() > 0 && ke->text()[0].isPrint()) || m_dateFrame) {
                if (ke->key() == Qt::Key_Return || ke->key() == Qt::Key_Enter || ke->key() == Qt::Key_Select) {
                    applyDate();
                    emit editingFinished();
                    removeDateLabel();
                } else if (ke->key() == Qt::Key_Escape) {
                    removeDateLabel();
                } else if (e->type() == QEvent::KeyPress) {
                    createDateLabel();
                    m_dateValidator->handleKeyEvent(ke);
                    updateDateLabel();
                }
                ke->accept();
                return true;
            }
            // If we are navigating let the user finish his date in old locate.
            // If we change our mind and want it to update immediately simply uncomment below
            /*
        } else if (e->type() == QEvent::LocaleChange) {
            if (m_dateValidator) {
                m_dateValidator->setLocale(m_widget->locale());
                m_dateValidator->setFormat(m_widget->locale().dateFormat(QLocale::ShortFormat));
                updateDateLabel();
            }
            */
        }
    }
    return QObject::eventFilter(o,e);
}

void QCalendarTextNavigator::timerEvent(QTimerEvent *e)
{
    if (e->timerId() == m_acceptTimer.timerId()) {
        applyDate();
        removeDateLabel();
    }
}

int QCalendarTextNavigator::dateEditAcceptDelay() const
{
    return m_editDelay;
}

void QCalendarTextNavigator::setDateEditAcceptDelay(int delay)
{
    m_editDelay = delay;
}

class QCalendarView;

class QCalendarModel : public QAbstractTableModel
{
    Q_OBJECT
public:
    QCalendarModel(QObject *parent = 0);

    int rowCount(const QModelIndex &) const
        { return RowCount + m_firstRow; }
    int columnCount(const QModelIndex &) const
        { return ColumnCount + m_firstColumn; }
    QVariant data(const QModelIndex &index, int role) const;
    Qt::ItemFlags flags(const QModelIndex &index) const;

    bool insertRows(int row, int count, const QModelIndex &parent = QModelIndex())
    {
        beginInsertRows(parent, row, row + count - 1);
        endInsertRows();
        return true;
    }
    bool insertColumns(int column, int count, const QModelIndex &parent = QModelIndex())
    {
        beginInsertColumns(parent, column, column + count - 1);
        endInsertColumns();
        return true;
    }
    bool removeRows(int row, int count, const QModelIndex &parent = QModelIndex())
    {
        beginRemoveRows(parent, row, row + count - 1);
        endRemoveRows();
        return true;
    }
    bool removeColumns(int column, int count, const QModelIndex &parent = QModelIndex())
    {
        beginRemoveColumns(parent, column, column + count - 1);
        endRemoveColumns();
        return true;
    }

    void showMonth(int year, int month);
    void setDate(const QDate &d);

    void setMinimumDate(const QDate &date);
    void setMaximumDate(const QDate &date);

    void setRange(const QDate &min, const QDate &max);

    void setHorizontalHeaderFormat(QCalendarWidget::HorizontalHeaderFormat format);

    void setFirstColumnDay(Qt::DayOfWeek dayOfWeek);
    Qt::DayOfWeek firstColumnDay() const;

    bool weekNumbersShown() const;
    void setWeekNumbersShown(bool show);

    QTextCharFormat formatForCell(int row, int col) const;
    Qt::DayOfWeek dayOfWeekForColumn(int section) const;
    int columnForDayOfWeek(Qt::DayOfWeek day) const;
    QDate dateForCell(int row, int column) const;
    void cellForDate(const QDate &date, int *row, int *column) const;
    QString dayName(Qt::DayOfWeek day) const;

    void setView(QCalendarView *view)
        { m_view = view; }

    void internalUpdate();
    QDate referenceDate() const;
    int columnForFirstOfMonth(const QDate &date) const;

    int m_firstColumn;
    int m_firstRow;
    QDate m_date;
    QDate m_minimumDate;
    QDate m_maximumDate;
    int m_shownYear;
    int m_shownMonth;
    Qt::DayOfWeek m_firstDay;
    QCalendarWidget::HorizontalHeaderFormat m_horizontalHeaderFormat;
    bool m_weekNumbersShown;
    QMap<Qt::DayOfWeek, QTextCharFormat> m_dayFormats;
    QMap<QDate, QTextCharFormat> m_dateFormats;
    QTextCharFormat m_headerFormat;
    QCalendarView *m_view;
};

class QCalendarView : public QTableView
{
    Q_OBJECT
public:
    QCalendarView(QWidget *parent = 0);

    void internalUpdate() { updateGeometries(); }
    void setReadOnly(bool enable);
    virtual void keyboardSearch(const QString & search) { Q_UNUSED(search) }

signals:
    void showDate(const QDate &date);
    void changeDate(const QDate &date, bool changeMonth);
    void clicked(const QDate &date);
    void editingFinished();
protected:
    QModelIndex moveCursor(CursorAction cursorAction, Qt::KeyboardModifiers modifiers);
    void mouseDoubleClickEvent(QMouseEvent *event);
    void mousePressEvent(QMouseEvent *event);
    void mouseMoveEvent(QMouseEvent *event);
    void mouseReleaseEvent(QMouseEvent *event);
#ifndef QT_NO_WHEELEVENT
    void wheelEvent(QWheelEvent *event);
#endif
    void keyPressEvent(QKeyEvent *event);
    bool event(QEvent *event);

    QDate handleMouseEvent(QMouseEvent *event);
public:
    bool readOnly;
private:
    bool validDateClicked;
#ifdef QT_KEYPAD_NAVIGATION
    QDate origDate;
#endif
};

QCalendarModel::QCalendarModel(QObject *parent)
    : QAbstractTableModel(parent)
{
    m_date = QDate::currentDate();
    m_minimumDate = QDate::fromJulianDay(1);
    m_maximumDate = QDate(7999, 12, 31);
    m_shownYear = m_date.year();
    m_shownMonth = m_date.month();
    m_firstDay = Qt::Sunday;
    m_horizontalHeaderFormat = QCalendarWidget::ShortDayNames;
    m_weekNumbersShown = true;
    m_firstColumn = 1;
    m_firstRow = 1;
    m_view = 0;
}

Qt::DayOfWeek QCalendarModel::dayOfWeekForColumn(int column) const
{
    int col = column - m_firstColumn;
    if (col < 0 || col > 6)
        return Qt::Sunday;
    int day = m_firstDay + col;
    if (day > 7)
        day -= 7;
    return Qt::DayOfWeek(day);
}

int QCalendarModel::columnForDayOfWeek(Qt::DayOfWeek day) const
{
    if (day < 1 || day > 7)
        return -1;
    int column = (int)day - (int)m_firstDay;
    if (column < 0)
        column += 7;
    return column + m_firstColumn;
}

/*
This simple algorithm tries to generate a valid date from the month shown.
Some months don't contain a first day (e.g. Jan of -4713 year,
so QDate (-4713, 1, 1) would be invalid). In that case we try to generate
another valid date for that month. Later, returned date's day is the number of cells
calendar widget will reserve for days before referenceDate. (E.g. if returned date's
day is 16, that day will be placed in 3rd or 4th row, not in the 1st or 2nd row).
Depending on referenceData we can change behaviour of Oct 1582. If referenceDate is 1st
of Oct we render 1 Oct in 1st or 2nd row. If referenceDate is 17 of Oct we show always 16
dates before 17 of Oct, and since this month contains the hole 5-14 Oct, the first of Oct
will be rendered in 2nd or 3rd row, showing more dates from previous month.
*/
QDate QCalendarModel::referenceDate() const
{
    int refDay = 1;
    while (refDay <= 31) {
        QDate refDate(m_shownYear, m_shownMonth, refDay);
        if (refDate.isValid())
            return refDate;
        refDay += 1;
    }
    return QDate();
}

int QCalendarModel::columnForFirstOfMonth(const QDate &date) const
{
    return (columnForDayOfWeek(static_cast<Qt::DayOfWeek>(date.dayOfWeek())) - (date.day() % 7) + 8) % 7;
}

QDate QCalendarModel::dateForCell(int row, int column) const
{
    if (row < m_firstRow || row > m_firstRow + RowCount - 1 ||
                column < m_firstColumn || column > m_firstColumn + ColumnCount - 1)
        return QDate();
    const QDate refDate = referenceDate();
    if (!refDate.isValid())
        return QDate();

    const int columnForFirstOfShownMonth = columnForFirstOfMonth(refDate);
    if (columnForFirstOfShownMonth - m_firstColumn < MinimumDayOffset)
        row -= 1;

    const int requestedDay = 7 * (row - m_firstRow) + column - columnForFirstOfShownMonth - refDate.day() + 1;
    return refDate.addDays(requestedDay);
}

void QCalendarModel::cellForDate(const QDate &date, int *row, int *column) const
{
    if (!row && !column)
        return;

    if (row)
        *row = -1;
    if (column)
        *column = -1;

    const QDate refDate = referenceDate();
    if (!refDate.isValid())
        return;

    const int columnForFirstOfShownMonth = columnForFirstOfMonth(refDate);
    const int requestedPosition = refDate.daysTo(date) - m_firstColumn + columnForFirstOfShownMonth + refDate.day() - 1;

    int c = requestedPosition % 7;
    int r = requestedPosition / 7;
    if (c < 0) {
        c += 7;
        r -= 1;
    }

    if (columnForFirstOfShownMonth - m_firstColumn < MinimumDayOffset)
        r += 1;

    if (r < 0 || r > RowCount - 1 || c < 0 || c > ColumnCount - 1)
        return;

    if (row)
        *row = r + m_firstRow;
    if (column)
        *column = c + m_firstColumn;
}

QString QCalendarModel::dayName(Qt::DayOfWeek day) const
{
    switch (m_horizontalHeaderFormat) {
        case QCalendarWidget::SingleLetterDayNames: {
            QString standaloneDayName = m_view->locale().standaloneDayName(day, QLocale::NarrowFormat);
            if (standaloneDayName == m_view->locale().dayName(day, QLocale::NarrowFormat))
                return standaloneDayName.left(1);
            return standaloneDayName;
        }
        case QCalendarWidget::ShortDayNames:
            return m_view->locale().dayName(day, QLocale::ShortFormat);
        case QCalendarWidget::LongDayNames:
            return m_view->locale().dayName(day, QLocale::LongFormat);
        default:
            break;
    }
    return QString();
}

QTextCharFormat QCalendarModel::formatForCell(int row, int col) const
{
    QPalette pal;
    QPalette::ColorGroup cg = QPalette::Active;
    if (m_view) {
        pal = m_view->palette();
        if (!m_view->isEnabled())
            cg = QPalette::Disabled;
        else if (!m_view->isActiveWindow())
            cg = QPalette::Inactive;
    }

    QTextCharFormat format;
    format.setFont(m_view->font());
    bool header = (m_weekNumbersShown && col == HeaderColumn)
                  || (m_horizontalHeaderFormat != QCalendarWidget::NoHorizontalHeader && row == HeaderRow);
    format.setBackground(pal.brush(cg, header ? QPalette::AlternateBase : QPalette::Base));
    format.setForeground(pal.brush(cg, QPalette::Text));
    if (header) {
        format.merge(m_headerFormat);
    }

    if (col >= m_firstColumn && col < m_firstColumn + ColumnCount) {
        Qt::DayOfWeek dayOfWeek = dayOfWeekForColumn(col);
        if (m_dayFormats.contains(dayOfWeek))
            format.merge(m_dayFormats.value(dayOfWeek));
    }

    if (!header) {
        QDate date = dateForCell(row, col);
        format.merge(m_dateFormats.value(date));
        if(date < m_minimumDate || date > m_maximumDate)
            format.setBackground(pal.brush(cg, QPalette::Window));
        if (m_shownMonth != date.month())
            format.setForeground(pal.brush(QPalette::Disabled, QPalette::Text));
    }
    return format;
}

QVariant QCalendarModel::data(const QModelIndex &index, int role) const
{
    if (role == Qt::TextAlignmentRole)
        return (int) Qt::AlignCenter;

    int row = index.row();
    int column = index.column();

    if(role == Qt::DisplayRole) {
        if (m_weekNumbersShown && column == HeaderColumn
            && row >= m_firstRow && row < m_firstRow + RowCount) {
            QDate date = dateForCell(row, columnForDayOfWeek(Qt::Monday));
            if (date.isValid())
                return date.weekNumber();
        }
        if (m_horizontalHeaderFormat != QCalendarWidget::NoHorizontalHeader && row == HeaderRow
            && column >= m_firstColumn && column < m_firstColumn + ColumnCount)
            return dayName(dayOfWeekForColumn(column));
        QDate date = dateForCell(row, column);
        if (date.isValid())
            return date.day();
        return QString();
    }

    QTextCharFormat fmt = formatForCell(row, column);
    if (role == Qt::BackgroundColorRole)
        return fmt.background().color();
    if (role == Qt::TextColorRole)
        return fmt.foreground().color();
    if (role == Qt::FontRole)
        return fmt.font();
    if (role == Qt::ToolTipRole)
        return fmt.toolTip();
    return QVariant();
}

Qt::ItemFlags QCalendarModel::flags(const QModelIndex &index) const
{
    QDate date = dateForCell(index.row(), index.column());
    if (!date.isValid())
        return QAbstractTableModel::flags(index);
    if (date < m_minimumDate)
        return 0;
    if (date > m_maximumDate)
        return 0;
    return QAbstractTableModel::flags(index);
}

void QCalendarModel::setDate(const QDate &d)
{
    m_date = d;
    if (m_date < m_minimumDate)
        m_date = m_minimumDate;
    else if (m_date > m_maximumDate)
        m_date = m_maximumDate;
}

void QCalendarModel::showMonth(int year, int month)
{
    if (m_shownYear == year && m_shownMonth == month)
        return;

    m_shownYear = year;
    m_shownMonth = month;

    internalUpdate();
}

void QCalendarModel::setMinimumDate(const QDate &d)
{
    if (!d.isValid() || d == m_minimumDate)
        return;

    m_minimumDate = d;
    if (m_maximumDate < m_minimumDate)
        m_maximumDate = m_minimumDate;
    if (m_date < m_minimumDate)
        m_date = m_minimumDate;
    internalUpdate();
}

void QCalendarModel::setMaximumDate(const QDate &d)
{
    if (!d.isValid() || d == m_maximumDate)
        return;

    m_maximumDate = d;
    if (m_minimumDate > m_maximumDate)
        m_minimumDate = m_maximumDate;
    if (m_date > m_maximumDate)
        m_date = m_maximumDate;
    internalUpdate();
}

void QCalendarModel::setRange(const QDate &min, const QDate &max)
{
    m_minimumDate = min;
    m_maximumDate = max;
    if (m_minimumDate > m_maximumDate)
        qSwap(m_minimumDate, m_maximumDate);
    if (m_date < m_minimumDate)
        m_date = m_minimumDate;
    if (m_date > m_maximumDate)
        m_date = m_maximumDate;
    internalUpdate();
}

void QCalendarModel::internalUpdate()
{
    QModelIndex begin = index(0, 0);
    QModelIndex end = index(m_firstRow + RowCount - 1, m_firstColumn + ColumnCount - 1);
    emit dataChanged(begin, end);
    emit headerDataChanged(Qt::Vertical, 0, m_firstRow + RowCount - 1);
    emit headerDataChanged(Qt::Horizontal, 0, m_firstColumn + ColumnCount - 1);
}

void QCalendarModel::setHorizontalHeaderFormat(QCalendarWidget::HorizontalHeaderFormat format)
{
    if (m_horizontalHeaderFormat == format)
        return;

    int oldFormat = m_horizontalHeaderFormat;
    m_horizontalHeaderFormat = format;
    if (oldFormat == QCalendarWidget::NoHorizontalHeader) {
        m_firstRow = 1;
        insertRow(0);
    } else if (m_horizontalHeaderFormat == QCalendarWidget::NoHorizontalHeader) {
        m_firstRow = 0;
        removeRow(0);
    }
    internalUpdate();
}

void QCalendarModel::setFirstColumnDay(Qt::DayOfWeek dayOfWeek)
{
    if (m_firstDay == dayOfWeek)
        return;

    m_firstDay = dayOfWeek;
    internalUpdate();
}

Qt::DayOfWeek QCalendarModel::firstColumnDay() const
{
    return m_firstDay;
}

bool QCalendarModel::weekNumbersShown() const
{
    return m_weekNumbersShown;
}

void QCalendarModel::setWeekNumbersShown(bool show)
{
    if (m_weekNumbersShown == show)
        return;

    m_weekNumbersShown = show;
    if (show) {
        m_firstColumn = 1;
        insertColumn(0);
    } else {
        m_firstColumn = 0;
        removeColumn(0);
    }
    internalUpdate();
}

QCalendarView::QCalendarView(QWidget *parent)
    : QTableView(parent),
    readOnly(false),
    validDateClicked(false)
{
    setTabKeyNavigation(false);
    setShowGrid(false);
    verticalHeader()->setVisible(false);
    horizontalHeader()->setVisible(false);
    setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
    setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
}

QModelIndex QCalendarView::moveCursor(CursorAction cursorAction, Qt::KeyboardModifiers modifiers)
{
    QCalendarModel *calendarModel = qobject_cast<QCalendarModel *>(model());
    if (!calendarModel)
        return QTableView::moveCursor(cursorAction, modifiers);

    if (readOnly)
        return currentIndex();

    QModelIndex index = currentIndex();
    QDate currentDate = static_cast<QCalendarModel*>(model())->dateForCell(index.row(), index.column());
    switch (cursorAction) {
        case QAbstractItemView::MoveUp:
            currentDate = currentDate.addDays(-7);
            break;
        case QAbstractItemView::MoveDown:
            currentDate = currentDate.addDays(7);
            break;
        case QAbstractItemView::MoveLeft:
            currentDate = currentDate.addDays(isRightToLeft() ? 1 : -1);
            break;
        case QAbstractItemView::MoveRight:
            currentDate = currentDate.addDays(isRightToLeft() ? -1 : 1);
            break;
        case QAbstractItemView::MoveHome:
            currentDate = QDate(currentDate.year(), currentDate.month(), 1);
            break;
        case QAbstractItemView::MoveEnd:
            currentDate = QDate(currentDate.year(), currentDate.month(), currentDate.daysInMonth());
            break;
        case QAbstractItemView::MovePageUp:
            currentDate = currentDate.addMonths(-1);
            break;
        case QAbstractItemView::MovePageDown:
            currentDate = currentDate.addMonths(1);
            break;
        case QAbstractItemView::MoveNext:
        case QAbstractItemView::MovePrevious:
            return currentIndex();
        default:
            break;
    }
    emit changeDate(currentDate, true);
    return currentIndex();
}

void QCalendarView::keyPressEvent(QKeyEvent *event)
{
#ifdef QT_KEYPAD_NAVIGATION
    if (event->key() == Qt::Key_Select) {
        if (QApplication::keypadNavigationEnabled()) {
            if (!hasEditFocus()) {
                setEditFocus(true);
                return;
            }
        }
    } else if (event->key() == Qt::Key_Back) {
        if (QApplication::keypadNavigationEnabled() && hasEditFocus()) {
            if (qobject_cast<QCalendarModel *>(model())) {
                emit changeDate(origDate, true); //changes selection back to origDate, but doesn't activate
                setEditFocus(false);
                return;
            }
        }
    }
#endif

    if (!readOnly) {
        switch (event->key()) {
            case Qt::Key_Return:
            case Qt::Key_Enter:
            case Qt::Key_Select:
                emit editingFinished();
                return;
            default:
                break;
        }
    }
    QTableView::keyPressEvent(event);
}

#ifndef QT_NO_WHEELEVENT
void QCalendarView::wheelEvent(QWheelEvent *event)
{
    const int numDegrees = event->delta() / 8;
    const int numSteps = numDegrees / 15;
    const QModelIndex index = currentIndex();
    QDate currentDate = static_cast<QCalendarModel*>(model())->dateForCell(index.row(), index.column());
    currentDate = currentDate.addMonths(-numSteps);
    emit showDate(currentDate);
}
#endif

bool QCalendarView::event(QEvent *event)
{
#ifdef QT_KEYPAD_NAVIGATION
    if (event->type() == QEvent::FocusIn) {
        if (QCalendarModel *calendarModel = qobject_cast<QCalendarModel *>(model())) {
            origDate = calendarModel->m_date;
        }
    }
#endif

    return QTableView::event(event);
}

QDate QCalendarView::handleMouseEvent(QMouseEvent *event)
{
    QCalendarModel *calendarModel = qobject_cast<QCalendarModel *>(model());
    if (!calendarModel)
        return QDate();

    QPoint pos = event->pos();
    QModelIndex index = indexAt(pos);
    QDate date = calendarModel->dateForCell(index.row(), index.column());
    if (date.isValid() && date >= calendarModel->m_minimumDate
            && date <= calendarModel->m_maximumDate) {
        return date;
    }
    return QDate();
}

void QCalendarView::mouseDoubleClickEvent(QMouseEvent *event)
{
    QCalendarModel *calendarModel = qobject_cast<QCalendarModel *>(model());
    if (!calendarModel) {
        QTableView::mouseDoubleClickEvent(event);
        return;
    }

    if (readOnly)
        return;

    QDate date = handleMouseEvent(event);
    validDateClicked = false;
    if (date == calendarModel->m_date && !style()->styleHint(QStyle::SH_ItemView_ActivateItemOnSingleClick)) {
        emit editingFinished();
    }
}

void QCalendarView::mousePressEvent(QMouseEvent *event)
{
    QCalendarModel *calendarModel = qobject_cast<QCalendarModel *>(model());
    if (!calendarModel) {
        QTableView::mousePressEvent(event);
        return;
    }

    if (readOnly)
        return;

    if (event->button() != Qt::LeftButton)
        return;

    QDate date = handleMouseEvent(event);
    if (date.isValid()) {
        validDateClicked = true;
        int row = -1, col = -1;
        static_cast<QCalendarModel *>(model())->cellForDate(date, &row, &col);
        if (row != -1 && col != -1) {
            selectionModel()->setCurrentIndex(model()->index(row, col), QItemSelectionModel::NoUpdate);
        }
    } else {
        validDateClicked = false;
        event->ignore();
    }
}

void QCalendarView::mouseMoveEvent(QMouseEvent *event)
{
    QCalendarModel *calendarModel = qobject_cast<QCalendarModel *>(model());
    if (!calendarModel) {
        QTableView::mouseMoveEvent(event);
        return;
    }

    if (readOnly)
        return;

    if (validDateClicked) {
       QDate date = handleMouseEvent(event);
        if (date.isValid()) {
            int row = -1, col = -1;
            static_cast<QCalendarModel *>(model())->cellForDate(date, &row, &col);
            if (row != -1 && col != -1) {
                selectionModel()->setCurrentIndex(model()->index(row, col), QItemSelectionModel::NoUpdate);
            }
        }
    } else {
        event->ignore();
    }
}

void QCalendarView::mouseReleaseEvent(QMouseEvent *event)
{
    QCalendarModel *calendarModel = qobject_cast<QCalendarModel *>(model());
    if (!calendarModel) {
        QTableView::mouseReleaseEvent(event);
        return;
    }

    if (event->button() != Qt::LeftButton)
        return;

    if (readOnly)
        return;

    if (validDateClicked) {
        QDate date = handleMouseEvent(event);
        if (date.isValid()) {
            emit changeDate(date, true);
            emit clicked(date);
            if (style()->styleHint(QStyle::SH_ItemView_ActivateItemOnSingleClick))
                emit editingFinished();
        }
        validDateClicked = false;
    } else {
        event->ignore();
    }
}

class QCalendarDelegate : public QItemDelegate
{
    Q_OBJECT
public:
    QCalendarDelegate(QCalendarWidgetPrivate *w, QObject *parent = 0)
        : QItemDelegate(parent), calendarWidgetPrivate(w)
            { }
    virtual void paint(QPainter *painter, const QStyleOptionViewItem &option,
                const QModelIndex &index) const;
    void paintCell(QPainter *painter, const QRect &rect, const QDate &date) const;

private:
    QCalendarWidgetPrivate *calendarWidgetPrivate;
    mutable QStyleOptionViewItemV4 storedOption;
};

//Private tool button class
class QCalToolButton: public QToolButton
{
public:
    QCalToolButton(QWidget * parent)
        : QToolButton(parent)
          {  }
protected:
    void paintEvent(QPaintEvent *e)
    {
        Q_UNUSED(e)

#ifndef Q_WS_MAC
        QStyleOptionToolButton opt;
        initStyleOption(&opt);

        if (opt.state & QStyle::State_MouseOver || isDown()) {
            //act as normal button
            setPalette(QPalette());
        } else {
            //set the highlight color for button text
            QPalette toolPalette = palette();
            toolPalette.setColor(QPalette::ButtonText, toolPalette.color(QPalette::HighlightedText));
            setPalette(toolPalette);
        }
#endif
        QToolButton::paintEvent(e);
    }
};

class QPrevNextCalButton : public QToolButton
{
    Q_OBJECT
public:
    QPrevNextCalButton(QWidget *parent) : QToolButton(parent) {}
protected:
    void paintEvent(QPaintEvent *) {
        QStylePainter painter(this);
        QStyleOptionToolButton opt;
        initStyleOption(&opt);
        opt.state &= ~QStyle::State_HasFocus;
        painter.drawComplexControl(QStyle::CC_ToolButton, opt);
    }
};

class QCalendarWidgetPrivate : public QWidgetPrivate
{
    Q_DECLARE_PUBLIC(QCalendarWidget)
public:
    QCalendarWidgetPrivate();

    void showMonth(int year, int month);
    void update();
    void paintCell(QPainter *painter, const QRect &rect, const QDate &date) const;

    void _q_slotShowDate(const QDate &date);
    void _q_slotChangeDate(const QDate &date);
    void _q_slotChangeDate(const QDate &date, bool changeMonth);
    void _q_editingFinished();
    void _q_monthChanged(QAction*);
    void _q_prevMonthClicked();
    void _q_nextMonthClicked();
    void _q_yearEditingFinished();
    void _q_yearClicked();

    void createNavigationBar(QWidget *widget);
    void updateButtonIcons();
    void updateMonthMenu();
    void updateMonthMenuNames();
    void updateNavigationBar();
    void updateCurrentPage(const QDate &newDate);
    inline QDate getCurrentDate();
    void setNavigatorEnabled(bool enable);

    QCalendarModel *m_model;
    QCalendarView *m_view;
    QCalendarDelegate *m_delegate;
    QItemSelectionModel *m_selection;
    QCalendarTextNavigator *m_navigator;
    bool m_dateEditEnabled;

    QToolButton *nextMonth;
    QToolButton *prevMonth;
    QCalToolButton *monthButton;
    QMenu *monthMenu;
    QMap<int, QAction *> monthToAction;
    QCalToolButton *yearButton;
    QSpinBox *yearEdit;
    QWidget *navBarBackground;
    QSpacerItem *spaceHolder;

    bool navBarVisible;
    mutable QSize cachedSizeHint;
    Qt::FocusPolicy oldFocusPolicy;
};

void QCalendarDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option,
            const QModelIndex &index) const
{
    QDate date = calendarWidgetPrivate->m_model->dateForCell(index.row(), index.column());
    if (date.isValid()) {
        storedOption = option;
        QRect rect = option.rect;
        calendarWidgetPrivate->paintCell(painter, rect, date);
    } else {
        QItemDelegate::paint(painter, option, index);
    }
}

void QCalendarDelegate::paintCell(QPainter *painter, const QRect &rect, const QDate &date) const
{
    storedOption.rect = rect;
    int row = -1;
    int col = -1;
    calendarWidgetPrivate->m_model->cellForDate(date, &row, &col);
    QModelIndex idx = calendarWidgetPrivate->m_model->index(row, col);
    QItemDelegate::paint(painter, storedOption, idx);
}

QCalendarWidgetPrivate::QCalendarWidgetPrivate()
    : QWidgetPrivate()
{
    m_model = 0;
    m_view = 0;
    m_delegate = 0;
    m_selection = 0;
    m_navigator = 0;
    m_dateEditEnabled = false;
    navBarVisible = true;
    oldFocusPolicy = Qt::StrongFocus;
}

void QCalendarWidgetPrivate::setNavigatorEnabled(bool enable)
{
    Q_Q(QCalendarWidget);

    bool navigatorEnabled = (m_navigator->widget() != 0);
    if (enable == navigatorEnabled)
        return;

    if (enable) {
        m_navigator->setWidget(q);
        q->connect(m_navigator, SIGNAL(dateChanged(QDate)),
                q, SLOT(_q_slotChangeDate(QDate)));
        q->connect(m_navigator, SIGNAL(editingFinished()),
                q, SLOT(_q_editingFinished()));
        m_view->installEventFilter(m_navigator);
    } else {
        m_navigator->setWidget(0);
        q->disconnect(m_navigator, SIGNAL(dateChanged(QDate)),
                q, SLOT(_q_slotChangeDate(QDate)));
        q->disconnect(m_navigator, SIGNAL(editingFinished()),
                q, SLOT(_q_editingFinished()));
        m_view->removeEventFilter(m_navigator);
    }
}

void QCalendarWidgetPrivate::createNavigationBar(QWidget *widget)
{
    Q_Q(QCalendarWidget);
    navBarBackground = new QWidget(widget);
    navBarBackground->setObjectName(QLatin1String("qt_calendar_navigationbar"));
    navBarBackground->setAutoFillBackground(true);
    navBarBackground->setBackgroundRole(QPalette::Highlight);

    prevMonth = new QPrevNextCalButton(navBarBackground);
    nextMonth = new QPrevNextCalButton(navBarBackground);
    prevMonth->setAutoRaise(true);
    nextMonth->setAutoRaise(true);
    prevMonth->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Minimum);
    nextMonth->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Minimum);
    nextMonth->setAutoRaise(true);
    updateButtonIcons();
    prevMonth->setAutoRepeat(true);
    nextMonth->setAutoRepeat(true);

    monthButton = new QCalToolButton(navBarBackground);
    monthButton->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Minimum);
    monthButton->setAutoRaise(true);
    monthButton->setPopupMode(QToolButton::InstantPopup);
    monthMenu = new QMenu(monthButton);
    for (int i = 1; i <= 12; i++) {
        QString monthName(q->locale().standaloneMonthName(i, QLocale::LongFormat));
        QAction *act = monthMenu->addAction(monthName);
        act->setData(i);
        monthToAction[i] = act;
    }
    monthButton->setMenu(monthMenu);
    yearButton = new QCalToolButton(navBarBackground);
    yearButton->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Minimum);
    yearButton->setAutoRaise(true);
    yearEdit = new QSpinBox(navBarBackground);

    QFont font = q->font();
    font.setBold(true);
    monthButton->setFont(font);
    yearButton->setFont(font);
    yearEdit->setFrame(false);
    yearEdit->setMinimum(m_model->m_minimumDate.year());
    yearEdit->setMaximum(m_model->m_maximumDate.year());
    yearEdit->hide();
    spaceHolder = new QSpacerItem(0,0);

    QHBoxLayout *headerLayout = new QHBoxLayout;
    headerLayout->setMargin(0);
    headerLayout->setSpacing(0);
    headerLayout->addWidget(prevMonth);
    headerLayout->insertStretch(headerLayout->count());
    headerLayout->addWidget(monthButton);
    headerLayout->addItem(spaceHolder);
    headerLayout->addWidget(yearButton);
    headerLayout->insertStretch(headerLayout->count());
    headerLayout->addWidget(nextMonth);
    navBarBackground->setLayout(headerLayout);

    yearEdit->setFocusPolicy(Qt::StrongFocus);
    prevMonth->setFocusPolicy(Qt::NoFocus);
    nextMonth->setFocusPolicy(Qt::NoFocus);
    yearButton->setFocusPolicy(Qt::NoFocus);
    monthButton->setFocusPolicy(Qt::NoFocus);

    //set names for the header controls.
    prevMonth->setObjectName(QLatin1String("qt_calendar_prevmonth"));
    nextMonth->setObjectName(QLatin1String("qt_calendar_nextmonth"));
    monthButton->setObjectName(QLatin1String("qt_calendar_monthbutton"));
    yearButton->setObjectName(QLatin1String("qt_calendar_yearbutton"));
    yearEdit->setObjectName(QLatin1String("qt_calendar_yearedit"));

    updateMonthMenu();
    showMonth(m_model->m_date.year(), m_model->m_date.month());
}

void QCalendarWidgetPrivate::updateButtonIcons()
{
    Q_Q(QCalendarWidget);
    prevMonth->setIcon(q->style()->standardIcon(q->isRightToLeft() ? QStyle::SP_ArrowRight : QStyle::SP_ArrowLeft, 0, q));
    nextMonth->setIcon(q->style()->standardIcon(q->isRightToLeft() ? QStyle::SP_ArrowLeft : QStyle::SP_ArrowRight, 0, q));
}

void QCalendarWidgetPrivate::updateMonthMenu()
{
    int beg = 1, end = 12;
    bool prevEnabled = true;
    bool nextEnabled = true;
    if (m_model->m_shownYear == m_model->m_minimumDate.year()) {
        beg = m_model->m_minimumDate.month();
        if (m_model->m_shownMonth == m_model->m_minimumDate.month())
            prevEnabled = false;
    }
    if (m_model->m_shownYear == m_model->m_maximumDate.year()) {
        end = m_model->m_maximumDate.month();
        if (m_model->m_shownMonth == m_model->m_maximumDate.month())
            nextEnabled = false;
    }
    prevMonth->setEnabled(prevEnabled);
    nextMonth->setEnabled(nextEnabled);
    for (int i = 1; i <= 12; i++) {
        bool monthEnabled = true;
        if (i < beg || i > end)
            monthEnabled = false;
        monthToAction[i]->setEnabled(monthEnabled);
    }
}

void QCalendarWidgetPrivate::updateMonthMenuNames()
{
    Q_Q(QCalendarWidget);

    for (int i = 1; i <= 12; i++) {
        QString monthName(q->locale().standaloneMonthName(i, QLocale::LongFormat));
        monthToAction[i]->setText(monthName);
    }
}

void QCalendarWidgetPrivate::updateCurrentPage(const QDate &date)
{
    Q_Q(QCalendarWidget);

    QDate newDate = date;
    QDate minDate = q->minimumDate();
    QDate maxDate = q->maximumDate();
    if (minDate.isValid()&& minDate.daysTo(newDate) < 0)
        newDate = minDate;
    if (maxDate.isValid()&& maxDate.daysTo(newDate) > 0)
        newDate = maxDate;
    showMonth(newDate.year(), newDate.month());
    int row = -1, col = -1;
    m_model->cellForDate(newDate, &row, &col);
    if (row != -1 && col != -1)
    {
        m_view->selectionModel()->setCurrentIndex(m_model->index(row, col),
                                                  QItemSelectionModel::NoUpdate);
    }
}

void QCalendarWidgetPrivate::_q_monthChanged(QAction *act)
{
    monthButton->setText(act->text());
    QDate currentDate = getCurrentDate();
    QDate newDate = currentDate.addMonths(act->data().toInt()-currentDate.month());
    updateCurrentPage(newDate);
}

QDate QCalendarWidgetPrivate::getCurrentDate()
{
    QModelIndex index = m_view->currentIndex();
    return m_model->dateForCell(index.row(), index.column());
}

void QCalendarWidgetPrivate::_q_prevMonthClicked()
{
    QDate currentDate = getCurrentDate().addMonths(-1);
    updateCurrentPage(currentDate);
}

void QCalendarWidgetPrivate::_q_nextMonthClicked()
{
    QDate currentDate = getCurrentDate().addMonths(1);
    updateCurrentPage(currentDate);
}

void QCalendarWidgetPrivate::_q_yearEditingFinished()
{
    Q_Q(QCalendarWidget);
    yearButton->setText(yearEdit->text());
    yearEdit->hide();
    q->setFocusPolicy(oldFocusPolicy);
    qApp->removeEventFilter(q);
    spaceHolder->changeSize(0, 0);
    yearButton->show();
    QDate currentDate = getCurrentDate();
    currentDate = currentDate.addYears(yearEdit->text().toInt() - currentDate.year());
    updateCurrentPage(currentDate);
}

void QCalendarWidgetPrivate::_q_yearClicked()
{
    Q_Q(QCalendarWidget);
    //show the spinbox on top of the button
    yearEdit->setGeometry(yearButton->x(), yearButton->y(),
                          yearEdit->sizeHint().width(), yearButton->height());
    spaceHolder->changeSize(yearButton->width(), 0);
    yearButton->hide();
    oldFocusPolicy = q->focusPolicy();
    q->setFocusPolicy(Qt::NoFocus);
    yearEdit->show();
    qApp->installEventFilter(q);
    yearEdit->raise();
    yearEdit->selectAll();
    yearEdit->setFocus(Qt::MouseFocusReason);
}

void QCalendarWidgetPrivate::showMonth(int year, int month)
{
    if (m_model->m_shownYear == year && m_model->m_shownMonth == month)
        return;
    Q_Q(QCalendarWidget);
    m_model->showMonth(year, month);
    updateNavigationBar();
    emit q->currentPageChanged(year, month);
    m_view->internalUpdate();
    cachedSizeHint = QSize();
    update();
    updateMonthMenu();
}

void QCalendarWidgetPrivate::updateNavigationBar()
{
    Q_Q(QCalendarWidget);

    QString monthName = q->locale().standaloneMonthName(m_model->m_shownMonth, QLocale::LongFormat);

    monthButton->setText(monthName);
    yearButton->setText(QString::number(m_model->m_shownYear));
    yearEdit->setValue(m_model->m_shownYear);
}

void QCalendarWidgetPrivate::update()
{
    QDate currentDate = m_model->m_date;
    int row, column;
    m_model->cellForDate(currentDate, &row, &column);
    QModelIndex idx;
    m_selection->clear();
    if (row != -1 && column != -1) {
        idx = m_model->index(row, column);
        m_selection->setCurrentIndex(idx, QItemSelectionModel::SelectCurrent);
    }
}

void QCalendarWidgetPrivate::paintCell(QPainter *painter, const QRect &rect, const QDate &date) const
{
    Q_Q(const QCalendarWidget);
    q->paintCell(painter, rect, date);
}

void QCalendarWidgetPrivate::_q_slotShowDate(const QDate &date)
{
    updateCurrentPage(date);
}

void QCalendarWidgetPrivate::_q_slotChangeDate(const QDate &date)
{
    _q_slotChangeDate(date, true);
}

void QCalendarWidgetPrivate::_q_slotChangeDate(const QDate &date, bool changeMonth)
{
    QDate oldDate = m_model->m_date;
    m_model->setDate(date);
    QDate newDate = m_model->m_date;
    if (changeMonth)
        showMonth(newDate.year(), newDate.month());
    if (oldDate != newDate) {
        update();
        Q_Q(QCalendarWidget);
        m_navigator->setDate(newDate);
        emit q->selectionChanged();
    }
}

void QCalendarWidgetPrivate::_q_editingFinished()
{
    Q_Q(QCalendarWidget);
    emit q->activated(m_model->m_date);
}

QCalendarWidget::QCalendarWidget(QWidget *parent)
    : QWidget(*new QCalendarWidgetPrivate, parent, 0)
{
    Q_D(QCalendarWidget);

    setAutoFillBackground(true);
    setBackgroundRole(QPalette::Window);

    QVBoxLayout *layoutV = new QVBoxLayout(this);
    layoutV->setMargin(0);
    d->m_model = new QCalendarModel(this);
    QTextCharFormat fmt;
    fmt.setForeground(QBrush(Qt::red));
    d->m_model->m_dayFormats.insert(Qt::Saturday, fmt);
    d->m_model->m_dayFormats.insert(Qt::Sunday, fmt);
    d->m_view = new QCalendarView(this);
    d->m_view->setObjectName(QLatin1String("qt_calendar_calendarview"));
    d->m_view->setModel(d->m_model);
    d->m_model->setView(d->m_view);
    d->m_view->setSelectionBehavior(QAbstractItemView::SelectItems);
    d->m_view->setSelectionMode(QAbstractItemView::SingleSelection);
    d->m_view->horizontalHeader()->setResizeMode(QHeaderView::Stretch);
    d->m_view->horizontalHeader()->setClickable(false);
    d->m_view->verticalHeader()->setResizeMode(QHeaderView::Stretch);
    d->m_view->verticalHeader()->setClickable(false);
    d->m_selection = d->m_view->selectionModel();
    d->createNavigationBar(this);
    d->m_view->setFrameStyle(QFrame::NoFrame);
    d->m_delegate = new QCalendarDelegate(d, this);
    d->m_view->setItemDelegate(d->m_delegate);
    d->update();
    d->updateNavigationBar();
    setFocusPolicy(Qt::StrongFocus);
    setFocusProxy(d->m_view);
    setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Preferred);

    connect(d->m_view, SIGNAL(showDate(QDate)),
            this, SLOT(_q_slotShowDate(QDate)));
    connect(d->m_view, SIGNAL(changeDate(QDate,bool)),
            this, SLOT(_q_slotChangeDate(QDate,bool)));
    connect(d->m_view, SIGNAL(clicked(QDate)),
            this, SIGNAL(clicked(QDate)));
    connect(d->m_view, SIGNAL(editingFinished()),
            this, SLOT(_q_editingFinished()));

    connect(d->prevMonth, SIGNAL(clicked(bool)),
            this, SLOT(_q_prevMonthClicked()));
    connect(d->nextMonth, SIGNAL(clicked(bool)),
            this, SLOT(_q_nextMonthClicked()));
    connect(d->yearButton, SIGNAL(clicked(bool)),
            this, SLOT(_q_yearClicked()));
    connect(d->monthMenu, SIGNAL(triggered(QAction*)),
            this, SLOT(_q_monthChanged(QAction*)));
    connect(d->yearEdit, SIGNAL(editingFinished()),
            this, SLOT(_q_yearEditingFinished()));

    layoutV->setMargin(0);
    layoutV->setSpacing(0);
    layoutV->addWidget(d->navBarBackground);
    layoutV->addWidget(d->m_view);

    d->m_navigator = new QCalendarTextNavigator(this);
    setDateEditEnabled(true);
}

QCalendarWidget::~QCalendarWidget()
{
}

QSize QCalendarWidget::sizeHint() const
{
    return minimumSizeHint();
}

QSize QCalendarWidget::minimumSizeHint() const
{
    Q_D(const QCalendarWidget);
    if (d->cachedSizeHint.isValid())
        return d->cachedSizeHint;

    ensurePolished();

    int w = 0;
    int h = 0;

    int end = 53;
    int rows = 7;
    int cols = 8;

    const int marginH = (style()->pixelMetric(QStyle::PM_FocusFrameHMargin) + 1) * 2;

    if (horizontalHeaderFormat() == QCalendarWidget::NoHorizontalHeader) {
        rows = 6;
    } else {
        for (int i = 1; i <= 7; i++) {
            QFontMetrics fm(d->m_model->formatForCell(0, i).font());
            w = qMax(w, fm.width(d->m_model->dayName(d->m_model->dayOfWeekForColumn(i))) + marginH);
            h = qMax(h, fm.height());
        }
    }

    if (verticalHeaderFormat() == QCalendarWidget::NoVerticalHeader) {
        cols = 7;
    } else {
        for (int i = 1; i <= 6; i++) {
            QFontMetrics fm(d->m_model->formatForCell(i, 0).font());
            for (int j = 1; j < end; j++)
                w = qMax(w, fm.width(QString::number(j)) + marginH);
            h = qMax(h, fm.height());
        }
    }

    QFontMetrics fm(d->m_model->formatForCell(1, 1).font());
    for (int i = 1; i <= end; i++) {
        w = qMax(w, fm.width(QString::number(i)) + marginH);
        h = qMax(h, fm.height());
    }

    if (d->m_view->showGrid()) {
        // hardcoded in tableview
        w += 1;
        h += 1;
    }

    w += 1; // default column span

    h = qMax(h, d->m_view->verticalHeader()->minimumSectionSize());
    w = qMax(w, d->m_view->horizontalHeader()->minimumSectionSize());

    //add the size of the header.
    QSize headerSize(0, 0);
    if (d->navBarVisible) {
        int headerH = d->navBarBackground->sizeHint().height();
        int headerW = 0;

        headerW += d->prevMonth->sizeHint().width();
        headerW += d->nextMonth->sizeHint().width();

        QFontMetrics fm = d->monthButton->fontMetrics();
        int monthW = 0;
        for (int i = 1; i < 12; i++) {
            QString monthName = locale().standaloneMonthName(i, QLocale::LongFormat);
            monthW = qMax(monthW, fm.boundingRect(monthName).width());
        }
        const int buttonDecoMargin = d->monthButton->sizeHint().width() - fm.boundingRect(d->monthButton->text()).width();
        headerW += monthW + buttonDecoMargin;

        fm = d->yearButton->fontMetrics();
        headerW += fm.boundingRect(QLatin1String("5555")).width() + buttonDecoMargin;

        headerSize = QSize(headerW, headerH);
    }
    w *= cols;
    w = qMax(headerSize.width(), w);
    h = (h * rows) + headerSize.height();
    d->cachedSizeHint = QSize(w, h);
    return d->cachedSizeHint;
}

void QCalendarWidget::paintCell(QPainter *painter, const QRect &rect, const QDate &date) const
{
    Q_D(const QCalendarWidget);
    d->m_delegate->paintCell(painter, rect, date);
}

QDate QCalendarWidget::selectedDate() const
{
    Q_D(const QCalendarWidget);
    return d->m_model->m_date;
}

void QCalendarWidget::setSelectedDate(const QDate &date)
{
    Q_D(QCalendarWidget);
    if (d->m_model->m_date == date && date == d->getCurrentDate())
        return;

    if (!date.isValid())
        return;

    d->m_model->setDate(date);
    d->update();
    QDate newDate = d->m_model->m_date;
    d->showMonth(newDate.year(), newDate.month());
    emit selectionChanged();
}

int QCalendarWidget::yearShown() const
{
    Q_D(const QCalendarWidget);
    return d->m_model->m_shownYear;
}

int QCalendarWidget::monthShown() const
{
    Q_D(const QCalendarWidget);
    return d->m_model->m_shownMonth;
}

void QCalendarWidget::setCurrentPage(int year, int month)
{
    Q_D(QCalendarWidget);
    QDate currentDate = d->getCurrentDate();
    int day = currentDate.day();
    int daysInMonths = QDate(year, month, 1).daysInMonth();
    if (day > daysInMonths)
        day = daysInMonths;

    d->showMonth(year, month);

    QDate newDate(year, month, day);
    int row = -1, col = -1;
    d->m_model->cellForDate(newDate, &row, &col);
    if (row != -1 && col != -1) {
        d->m_view->selectionModel()->setCurrentIndex(d->m_model->index(row, col),
                                                  QItemSelectionModel::NoUpdate);
    }
}

void QCalendarWidget::showNextMonth()
{
    int year = yearShown();
    int month = monthShown();
    if (month == 12) {
        ++year;
        month = 1;
    } else {
        ++month;
    }
    setCurrentPage(year, month);
}

void QCalendarWidget::showPreviousMonth()
{
    int year = yearShown();
    int month = monthShown();
    if (month == 1) {
        --year;
        month = 12;
    } else {
        --month;
    }
    setCurrentPage(year, month);
}

void QCalendarWidget::showNextYear()
{
    int year = yearShown();
    int month = monthShown();
    ++year;
    setCurrentPage(year, month);
}

void QCalendarWidget::showPreviousYear()
{
    int year = yearShown();
    int month = monthShown();
    --year;
    setCurrentPage(year, month);
}

void QCalendarWidget::showSelectedDate()
{
    QDate currentDate = selectedDate();
    setCurrentPage(currentDate.year(), currentDate.month());
}

void QCalendarWidget::showToday()
{
    QDate currentDate = QDate::currentDate();
    setCurrentPage(currentDate.year(), currentDate.month());
}

QDate QCalendarWidget::minimumDate() const
{
    Q_D(const QCalendarWidget);
    return d->m_model->m_minimumDate;
}

void QCalendarWidget::setMinimumDate(const QDate &date)
{
    Q_D(QCalendarWidget);
    if (!date.isValid() || d->m_model->m_minimumDate == date)
        return;

    QDate oldDate = d->m_model->m_date;
    d->m_model->setMinimumDate(date);
    d->yearEdit->setMinimum(d->m_model->m_minimumDate.year());
    d->updateMonthMenu();
    QDate newDate = d->m_model->m_date;
    if (oldDate != newDate) {
        d->update();
        d->showMonth(newDate.year(), newDate.month());
        d->m_navigator->setDate(newDate);
        emit selectionChanged();
    }
}

QDate QCalendarWidget::maximumDate() const
{
    Q_D(const QCalendarWidget);
    return d->m_model->m_maximumDate;
}

void QCalendarWidget::setMaximumDate(const QDate &date)
{
    Q_D(QCalendarWidget);
    if (!date.isValid() || d->m_model->m_maximumDate == date)
        return;

    QDate oldDate = d->m_model->m_date;
    d->m_model->setMaximumDate(date);
    d->yearEdit->setMaximum(d->m_model->m_maximumDate.year());
    d->updateMonthMenu();
    QDate newDate = d->m_model->m_date;
    if (oldDate != newDate) {
        d->update();
        d->showMonth(newDate.year(), newDate.month());
        d->m_navigator->setDate(newDate);
        emit selectionChanged();
    }
}

void QCalendarWidget::setDateRange(const QDate &min, const QDate &max)
{
    Q_D(QCalendarWidget);
    if (d->m_model->m_minimumDate == min && d->m_model->m_maximumDate == max)
        return;
    if (!min.isValid() || !max.isValid())
        return;

    QDate oldDate = d->m_model->m_date;
    d->m_model->setRange(min, max);
    d->yearEdit->setMinimum(d->m_model->m_minimumDate.year());
    d->yearEdit->setMaximum(d->m_model->m_maximumDate.year());
    d->updateMonthMenu();
    QDate newDate = d->m_model->m_date;
    if (oldDate != newDate) {
        d->update();
        d->showMonth(newDate.year(), newDate.month());
        d->m_navigator->setDate(newDate);
        emit selectionChanged();
    }
}


void QCalendarWidget::setHorizontalHeaderFormat(QCalendarWidget::HorizontalHeaderFormat format)
{
    Q_D(QCalendarWidget);
    if (d->m_model->m_horizontalHeaderFormat == format)
        return;

    d->m_model->setHorizontalHeaderFormat(format);
    d->cachedSizeHint = QSize();
    d->m_view->viewport()->update();
    d->m_view->updateGeometry();
}

QCalendarWidget::HorizontalHeaderFormat QCalendarWidget::horizontalHeaderFormat() const
{
    Q_D(const QCalendarWidget);
    return d->m_model->m_horizontalHeaderFormat;
}


QCalendarWidget::VerticalHeaderFormat QCalendarWidget::verticalHeaderFormat() const
{
    Q_D(const QCalendarWidget);
    bool shown = d->m_model->weekNumbersShown();
    if (shown)
        return QCalendarWidget::ISOWeekNumbers;
    return QCalendarWidget::NoVerticalHeader;
}

void QCalendarWidget::setVerticalHeaderFormat(QCalendarWidget::VerticalHeaderFormat format)
{
    Q_D(QCalendarWidget);
    bool show = false;
    if (format == QCalendarWidget::ISOWeekNumbers)
        show = true;
    if (d->m_model->weekNumbersShown() == show)
        return;
    d->m_model->setWeekNumbersShown(show);
    d->cachedSizeHint = QSize();
    d->m_view->viewport()->update();
    d->m_view->updateGeometry();
}

bool QCalendarWidget::isGridVisible() const
{
    Q_D(const QCalendarWidget);
    return d->m_view->showGrid();
}

void QCalendarWidget::setGridVisible(bool show)
{
    Q_D(QCalendarWidget);
    d->m_view->setShowGrid(show);
    d->cachedSizeHint = QSize();
    d->m_view->viewport()->update();
    d->m_view->updateGeometry();
}

QCalendarWidget::SelectionMode QCalendarWidget::selectionMode() const
{
    Q_D(const QCalendarWidget);
    return d->m_view->readOnly ? QCalendarWidget::NoSelection : QCalendarWidget::SingleSelection;
}

void QCalendarWidget::setSelectionMode(SelectionMode mode)
{
    Q_D(QCalendarWidget);
    d->m_view->readOnly = (mode == QCalendarWidget::NoSelection);
    d->setNavigatorEnabled(isDateEditEnabled() && (selectionMode() != QCalendarWidget::NoSelection));
    d->update();
}

void QCalendarWidget::setFirstDayOfWeek(Qt::DayOfWeek dayOfWeek)
{
    Q_D(QCalendarWidget);
    if ((Qt::DayOfWeek)d->m_model->firstColumnDay() == dayOfWeek)
        return;

    d->m_model->setFirstColumnDay(dayOfWeek);
    d->update();
}

Qt::DayOfWeek QCalendarWidget::firstDayOfWeek() const
{
    Q_D(const QCalendarWidget);
    return (Qt::DayOfWeek)d->m_model->firstColumnDay();
}

QTextCharFormat QCalendarWidget::headerTextFormat() const
{
    Q_D(const QCalendarWidget);
    return d->m_model->m_headerFormat;
}

void QCalendarWidget::setHeaderTextFormat(const QTextCharFormat &format)
{
    Q_D(QCalendarWidget);
    d->m_model->m_headerFormat = format;
    d->cachedSizeHint = QSize();
    d->m_view->viewport()->update();
    d->m_view->updateGeometry();
}

QTextCharFormat QCalendarWidget::weekdayTextFormat(Qt::DayOfWeek dayOfWeek) const
{
    Q_D(const QCalendarWidget);
    return d->m_model->m_dayFormats.value(dayOfWeek);
}

void QCalendarWidget::setWeekdayTextFormat(Qt::DayOfWeek dayOfWeek, const QTextCharFormat &format)
{
    Q_D(QCalendarWidget);
    d->m_model->m_dayFormats[dayOfWeek] = format;
    d->cachedSizeHint = QSize();
    d->m_view->viewport()->update();
    d->m_view->updateGeometry();
}

QMap<QDate, QTextCharFormat> QCalendarWidget::dateTextFormat() const
{
    Q_D(const QCalendarWidget);
    return d->m_model->m_dateFormats;
}

QTextCharFormat QCalendarWidget::dateTextFormat(const QDate &date) const
{
    Q_D(const QCalendarWidget);
    return d->m_model->m_dateFormats.value(date);
}

void QCalendarWidget::setDateTextFormat(const QDate &date, const QTextCharFormat &format)
{
    Q_D(QCalendarWidget);
    if (date.isNull())
        d->m_model->m_dateFormats.clear();
    else
        d->m_model->m_dateFormats[date] = format;
    d->m_view->viewport()->update();
    d->m_view->updateGeometry();
}

bool QCalendarWidget::isDateEditEnabled() const
{
    Q_D(const QCalendarWidget);
    return d->m_dateEditEnabled;
}

void QCalendarWidget::setDateEditEnabled(bool enable)
{
    Q_D(QCalendarWidget);
    if (isDateEditEnabled() == enable)
        return;

    d->m_dateEditEnabled = enable;

    d->setNavigatorEnabled(enable && (selectionMode() != QCalendarWidget::NoSelection));
}

int QCalendarWidget::dateEditAcceptDelay() const
{
    Q_D(const QCalendarWidget);
    return d->m_navigator->dateEditAcceptDelay();
}

void QCalendarWidget::setDateEditAcceptDelay(int delay)
{
    Q_D(QCalendarWidget);
    d->m_navigator->setDateEditAcceptDelay(delay);
}

void QCalendarWidget::updateCell(const QDate &date)
{
    if (!date.isValid()) {
        qWarning("QCalendarWidget::updateCell: Invalid date");
        return;
    }

    if (!isVisible())
        return;

    Q_D(QCalendarWidget);
    int row, column;
    d->m_model->cellForDate(date, &row, &column);
    if (row == -1 || column == -1)
        return;

    QModelIndex modelIndex = d->m_model->index(row, column);
    if (!modelIndex.isValid())
        return;

    d->m_view->viewport()->update(d->m_view->visualRect(modelIndex));
}

void QCalendarWidget::updateCells()
{
    Q_D(QCalendarWidget);
    if (isVisible())
        d->m_view->viewport()->update();
}

bool QCalendarWidget::isHeaderVisible() const
{
    Q_D(const QCalendarWidget);
    return d->navBarVisible;
}

void QCalendarWidget::setHeaderVisible(bool visible)
{
    setNavigationBarVisible(visible);
}

void QCalendarWidget::setNavigationBarVisible(bool visible)
{
    Q_D(QCalendarWidget);
    d->navBarVisible = visible;
    d->cachedSizeHint = QSize();
    d->navBarBackground->setVisible(visible);
    updateGeometry();
}

bool QCalendarWidget::event(QEvent *event)
{
    Q_D(QCalendarWidget);
    switch (event->type()) {
        case QEvent::LayoutDirectionChange:
            d->updateButtonIcons();
        case QEvent::LocaleChange:
            d->cachedSizeHint = QSize();
            d->updateMonthMenuNames();
            d->updateNavigationBar();
            d->m_view->updateGeometry();
            break;
        case QEvent::FontChange:
        case QEvent::ApplicationFontChange:
            d->cachedSizeHint = QSize();
            d->m_view->updateGeometry();
            break;
        case QEvent::StyleChange:
            d->cachedSizeHint = QSize();
            d->m_view->updateGeometry();
        default:
            break;
    }
    return QWidget::event(event);
}

bool QCalendarWidget::eventFilter(QObject *watched, QEvent *event)
{
    Q_D(QCalendarWidget);
    if (event->type() == QEvent::MouseButtonPress && d->yearEdit->hasFocus()) {
        QWidget *tlw = window();
        QWidget *widget = static_cast<QWidget*>(watched);
        //as we have a event filter on the whole application we first make sure that the top level widget
        //of both this and the watched widget are the same to decide if we should finish the year edition.
        if (widget->window() == tlw) {
            QPoint mousePos = widget->mapTo(tlw, static_cast<QMouseEvent *>(event)->pos());
            QRect geom = QRect(d->yearEdit->mapTo(tlw, QPoint(0, 0)), d->yearEdit->size());
            if (!geom.contains(mousePos)) {
                event->accept();
                d->_q_yearEditingFinished();
                setFocus();
                return true;
            }
        }
    }
    return QWidget::eventFilter(watched, event);
}

void QCalendarWidget::mousePressEvent(QMouseEvent *event)
{
    setAttribute(Qt::WA_NoMouseReplay);
    QWidget::mousePressEvent(event);
    setFocus();
}

void QCalendarWidget::resizeEvent(QResizeEvent * event)
{
    Q_D(QCalendarWidget);

    // XXX Should really use a QWidgetStack for yearEdit and yearButton,
    // XXX here we hide the year edit when the layout is likely to break
    // XXX the manual positioning of the yearEdit over the yearButton.
    if(d->yearEdit->isVisible() && event->size().width() != event->oldSize().width())
        d->_q_yearEditingFinished();

    QWidget::resizeEvent(event);
}

void QCalendarWidget::keyPressEvent(QKeyEvent * event)
{
    Q_D(QCalendarWidget);
    if(d->yearEdit->isVisible()&& event->key() == Qt::Key_Escape)
    {
        d->yearEdit->setValue(yearShown());
        d->_q_yearEditingFinished();
        return;
    }
    QWidget::keyPressEvent(event);
}

QT_END_NAMESPACE

#include "qcalendarwidget.moc"
#include "moc_qcalendarwidget.cpp"

#endif //QT_NO_CALENDARWIDGET