QML Calendar: list of visible days - qt

Question

Is there a way to get a list of visible days for the current month view (including the ones from previous/next month that are also visible)

Answer 1

If we inspect the code of the Calendar here we can find a suspicious property __model. We find, it has always a count of 42 - which is the amount of days that are visible.
The problem is, that in QML we can't really access descendants of QAbstractItemModels, as we need a QModelIndex to fetch data, struggle with int instead of roleNames to identify the roles e.t.c.
So we need to introduce a little helper, that offers a get(index) function to us, as known from the ListModel. As base for this, we can use the QIdentityProxyModel that we'll extend by the missing, exposed method.
qmlproxymodel.h
#ifndef QMLPROXYMODEL_H
#define QMLPROXYMODEL_H
#include <QObject>
#include <QIdentityProxyModel>
#include <QMap>
class QMLProxyModel : public QIdentityProxyModel
{
Q_OBJECT
public:
QMLProxyModel(QObject* parent = nullptr);
public slots:
QMap<QString, QVariant> get(int row_index) const;
};
#endif // QMLPROXYMODEL_H
qmlproxymodel.cpp
#include "qmlproxymodel.h"
QMLProxyModel::QMLProxyModel(QObject* parent)
: QIdentityProxyModel(parent)
{
}
QMap<QString, QVariant> QMLProxyModel::get(int row_index) const
{
QMap<QString, QVariant> ret;
QModelIndex ind = index(row_index, 0);
QHash<int, QByteArray> roles = roleNames();
// for some reason the itemData-method always throw a index-out-of-range exception
for (int e : roles.keys()) {
ret.insert(roles.value(e), data(ind, e));
}
return ret;
}
Then we register this new type to QML in our main.cpp
qmlRegisterType<QMLProxyModel>("QMLProxyModel", 1, 0, "QMLProxyModel");
Finally we use it in QML:
Calendar {
id: cal
anchors.fill: parent
}
QMLProxyModel {
id: pm
sourceModel: cal.__model
onDataChanged: console.log("Some Data has changed", pm.get(0).date)
}
Here I output the date of the first displayed date whenever the data of the model changes - that is, when the next month is selected.
It should be easy for you, to write a JS function to iterate over all (42) elements of the QMLProxyModel to add the content to any data structure, you desire.

Answer 2

I found a quicker workaround if anyone is interested. The following code considers week starting on Monday or Sunday.
I check what day is the first day of the month, and get the Monday/Sunday of the first week, and then I check through day = firstDay + X where X goes from 0 to 42.
function checkMonthlyCases(currentYear, currentMonth){
var firstMonthDay = new Date(currentYear,currentMonth,1,0)
var firstVisibleDay = new Date(firstMonthDay.getTime() - (((firstMonthDay.getDay() === Locale.Sunday) ? Qt.Sunday : firstMonthDay.getDay()) - 1) * 86400000 )
if( startDay == Qt.Sunday){
firstVisibleDay = new Date(firstVisibleDay.getTime() - 86400000);
}
for(var i=0; i< 42; i++){ // 42: number of visible days
var checkDay = new Date(firstVisibleDay.getTime() + i*86400000)
var count = getDayCaseCount(checkDay)
}
}