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// Copyright (C) 2021 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#include "qquickcalendarmodel_p.h"
#include <QtCore/private/qabstractitemmodel_p.h>
QT_BEGIN_NAMESPACE
/*!
\qmltype CalendarModel
\inherits QAbstractListModel
//! \instantiates QQuickCalendarModel
\inqmlmodule QtQuick.Controls
\brief A calendar model.
CalendarModel provides a way of creating a range of MonthGrid
instances. It is typically used as a model for a ListView that uses
MonthGrid as a delegate.
\snippet qtquickcontrols-calendarmodel.qml 1
In addition to the \c index property, a list of model data roles
are available in the context of each delegate:
\table
\row \li \b model.month : int \li The number of the month
\row \li \b model.year : int \li The number of the year
\endtable
\include zero-based-months.qdocinc
\sa MonthGrid, Calendar
*/
class QQuickCalendarModelPrivate : public QAbstractItemModelPrivate
{
Q_DECLARE_PUBLIC(QQuickCalendarModel)
public:
QQuickCalendarModelPrivate() : complete(false),
from(1,1,1), to(275759, 9, 25), count(0)
{
}
static int getCount(QDate from, QDate to);
void populate(QDate from, QDate to, bool force = false);
bool complete;
QDate from;
QDate to;
int count;
};
// Returns the number of months we need to display for both from and to to be shown,
// or zero if from is in a later month than to, or either is invalid.
int QQuickCalendarModelPrivate::getCount(QDate from, QDate to)
{
if (!from.isValid() || !to.isValid())
return 0;
const QCalendar gregorian;
Q_ASSERT(gregorian.isGregorian());
const QCalendar::YearMonthDay &f = gregorian.partsFromDate(from);
const QCalendar::YearMonthDay &t = gregorian.partsFromDate(to);
Q_ASSERT(f.isValid() && t.isValid()); // ... because from and to are valid.
if (f.year > t.year || (f.year == t.year && f.month > t.month))
return 0;
// Count from's month and every subsequent month until to's:
return 1 + t.month + 12 * (t.year - f.year) - f.month;
}
void QQuickCalendarModelPrivate::populate(QDate f, QDate t, bool force)
{
Q_Q(QQuickCalendarModel);
if (!force && f == from && t == to)
return;
int c = getCount(from, to);
if (c != count) {
q->beginResetModel();
count = c;
q->endResetModel();
emit q->countChanged();
} else {
emit q->dataChanged(q->index(0, 0), q->index(c - 1, 0));
}
}
QQuickCalendarModel::QQuickCalendarModel(QObject *parent) :
QAbstractListModel(*(new QQuickCalendarModelPrivate), parent)
{
}
/*!
\qmlproperty date QtQuick.Controls::CalendarModel::from
This property holds the start date.
*/
QDate QQuickCalendarModel::from() const
{
Q_D(const QQuickCalendarModel);
return d->from;
}
void QQuickCalendarModel::setFrom(QDate from)
{
Q_D(QQuickCalendarModel);
if (d->from != from) {
if (d->complete)
d->populate(from, d->to);
d->from = from;
emit fromChanged();
}
}
/*!
\qmlproperty date QtQuick.Controls::CalendarModel::to
This property holds the end date.
*/
QDate QQuickCalendarModel::to() const
{
Q_D(const QQuickCalendarModel);
return d->to;
}
void QQuickCalendarModel::setTo(QDate to)
{
Q_D(QQuickCalendarModel);
if (d->to != to) {
if (d->complete)
d->populate(d->from, to);
d->to = to;
emit toChanged();
}
}
/*!
\qmlmethod int QtQuick.Controls::CalendarModel::monthAt(int index)
Returns the month number at the specified model \a index.
*/
int QQuickCalendarModel::monthAt(int index) const
{
Q_D(const QQuickCalendarModel);
return d->from.addMonths(index).month() - 1;
}
/*!
\qmlmethod int QtQuick.Controls::CalendarModel::yearAt(int index)
Returns the year number at the specified model \a index.
*/
int QQuickCalendarModel::yearAt(int index) const
{
Q_D(const QQuickCalendarModel);
return d->from.addMonths(index).year();
}
/*!
\qmlmethod int QtQuick.Controls::CalendarModel::indexOf(Date date)
Returns the model index of the specified \a date.
*/
int QQuickCalendarModel::indexOf(QDate date) const
{
Q_D(const QQuickCalendarModel);
return d->getCount(d->from, date) - 1;
}
/*!
\qmlmethod int QtQuick.Controls::CalendarModel::indexOf(int year, int month)
Returns the model index of the specified \a year and \a month.
*/
int QQuickCalendarModel::indexOf(int year, int month) const
{
return indexOf(QDate(year, month + 1, 1));
}
QVariant QQuickCalendarModel::data(const QModelIndex &index, int role) const
{
Q_D(const QQuickCalendarModel);
if (index.isValid() && index.row() < d->count) {
switch (role) {
case MonthRole:
return monthAt(index.row());
case YearRole:
return yearAt(index.row());
default:
break;
}
}
return QVariant();
}
int QQuickCalendarModel::rowCount(const QModelIndex &parent) const
{
Q_D(const QQuickCalendarModel);
if (!parent.isValid())
return d->count;
return 0;
}
QHash<int, QByteArray> QQuickCalendarModel::roleNames() const
{
QHash<int, QByteArray> roles;
roles[MonthRole] = QByteArrayLiteral("month");
roles[YearRole] = QByteArrayLiteral("year");
return roles;
}
void QQuickCalendarModel::classBegin()
{
}
void QQuickCalendarModel::componentComplete()
{
Q_D(QQuickCalendarModel);
d->complete = true;
d->populate(d->from, d->to, true);
}
QT_END_NAMESPACE
#include "moc_qquickcalendarmodel_p.cpp"
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