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/****************************************************************************
**
** Copyright (C) 2018 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtWidgets module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/

#ifndef QCALENDARWIDGET_H
#define QCALENDARWIDGET_H

#include <QtWidgets/qtwidgetsglobal.h>
#include <QtWidgets/qwidget.h>
#include <QtCore/qdatetime.h>

QT_REQUIRE_CONFIG(calendarwidget);

QT_BEGIN_NAMESPACE

class QDate;
class QTextCharFormat;
class QCalendarWidgetPrivate;

class Q_WIDGETS_EXPORT QCalendarWidget : public QWidget
{
    Q_OBJECT
    Q_ENUMS(Qt::DayOfWeek)
    Q_PROPERTY(QDate selectedDate READ selectedDate WRITE setSelectedDate)
    Q_PROPERTY(QDate minimumDate READ minimumDate WRITE setMinimumDate)
    Q_PROPERTY(QDate maximumDate READ maximumDate WRITE setMaximumDate)
    Q_PROPERTY(Qt::DayOfWeek firstDayOfWeek READ firstDayOfWeek WRITE setFirstDayOfWeek)
    Q_PROPERTY(bool gridVisible READ isGridVisible WRITE setGridVisible)
    Q_PROPERTY(SelectionMode selectionMode READ selectionMode WRITE setSelectionMode)
    Q_PROPERTY(HorizontalHeaderFormat horizontalHeaderFormat READ horizontalHeaderFormat WRITE setHorizontalHeaderFormat)
    Q_PROPERTY(VerticalHeaderFormat verticalHeaderFormat READ verticalHeaderFormat WRITE setVerticalHeaderFormat)
    Q_PROPERTY(bool navigationBarVisible READ isNavigationBarVisible WRITE setNavigationBarVisible)
    Q_PROPERTY(bool dateEditEnabled READ isDateEditEnabled WRITE setDateEditEnabled)
    Q_PROPERTY(int dateEditAcceptDelay READ dateEditAcceptDelay WRITE setDateEditAcceptDelay)

public:
    enum HorizontalHeaderFormat {
        NoHorizontalHeader,
        SingleLetterDayNames,
        ShortDayNames,
        LongDayNames
    };
    Q_ENUM(HorizontalHeaderFormat)

    enum VerticalHeaderFormat {
        NoVerticalHeader,
        ISOWeekNumbers
    };
    Q_ENUM(VerticalHeaderFormat)

    enum SelectionMode {
        NoSelection,
        SingleSelection
    };
    Q_ENUM(SelectionMode)

    explicit QCalendarWidget(QWidget *parent = nullptr);
    ~QCalendarWidget();

    virtual QSize sizeHint() const override;
    virtual QSize minimumSizeHint() const override;

    QDate selectedDate() const;

    int yearShown() const;
    int monthShown() const;

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

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

    Qt::DayOfWeek firstDayOfWeek() const;
    void setFirstDayOfWeek(Qt::DayOfWeek dayOfWeek);

    bool isNavigationBarVisible() const;
    bool isGridVisible() const;

    QCalendar calendar() const;
    void setCalendar(QCalendar calendar);

    SelectionMode selectionMode() const;
    void setSelectionMode(SelectionMode mode);

    HorizontalHeaderFormat horizontalHeaderFormat() const;
    void setHorizontalHeaderFormat(HorizontalHeaderFormat format);

    VerticalHeaderFormat verticalHeaderFormat() const;
    void setVerticalHeaderFormat(VerticalHeaderFormat format);

    QTextCharFormat headerTextFormat() const;
    void setHeaderTextFormat(const QTextCharFormat &format);

    QTextCharFormat weekdayTextFormat(Qt::DayOfWeek dayOfWeek) const;
    void setWeekdayTextFormat(Qt::DayOfWeek dayOfWeek, const QTextCharFormat &format);

    QMap<QDate, QTextCharFormat> dateTextFormat() const;
    QTextCharFormat dateTextFormat(const QDate &date) const;
    void setDateTextFormat(const QDate &date, const QTextCharFormat &format);

    bool isDateEditEnabled() const;
    void setDateEditEnabled(bool enable);

    int dateEditAcceptDelay() const;
    void setDateEditAcceptDelay(int delay);

protected:
    bool event(QEvent *event) override;
    bool eventFilter(QObject *watched, QEvent *event) override;
    void mousePressEvent(QMouseEvent *event) override;
    void resizeEvent(QResizeEvent * event) override;
    void keyPressEvent(QKeyEvent * event) override;

    virtual void paintCell(QPainter *painter, const QRect &rect, const QDate &date) const;
    void updateCell(const QDate &date);
    void updateCells();

public Q_SLOTS:
    void setSelectedDate(const QDate &date);
    void setDateRange(const QDate &min, const QDate &max);
    void setCurrentPage(int year, int month);
    void setGridVisible(bool show);
    void setNavigationBarVisible(bool visible);
    void showNextMonth();
    void showPreviousMonth();
    void showNextYear();
    void showPreviousYear();
    void showSelectedDate();
    void showToday();

Q_SIGNALS:
    void selectionChanged();
    void clicked(const QDate &date);
    void activated(const QDate &date);
    void currentPageChanged(int year, int month);

private:
    Q_DECLARE_PRIVATE(QCalendarWidget)
    Q_DISABLE_COPY(QCalendarWidget)

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

};

QT_END_NAMESPACE

#endif // QCALENDARWIDGET_H