WSJT-X/item_delegates/DateTimeAsSecsSinceEpochDelegate.hpp

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#ifndef DATE_TIME_AS_SECS_SINCE_EPOCH_DELEGATE_HPP_
#define DATE_TIME_AS_SECS_SINCE_EPOCH_DELEGATE_HPP_
#include <memory>
#include <QStyledItemDelegate>
#include <QVariant>
#include <QLocale>
#include <QDateTime>
#include <QAbstractItemModel>
#include <QDateTimeEdit>
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class DateTimeAsSecsSinceEpochDelegate final
: public QStyledItemDelegate
{
public:
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DateTimeAsSecsSinceEpochDelegate (QObject * parent = nullptr)
: QStyledItemDelegate {parent}
{
}
static QVariant to_secs_since_epoch (QDateTime const& date_time)
{
return date_time.toMSecsSinceEpoch () / 1000ull;
}
static QDateTime to_date_time (QModelIndex const& index, int role = Qt::DisplayRole)
{
return to_date_time (index.model ()->data (index, role));
}
static QDateTime to_date_time (QVariant const& value)
{
return QDateTime::fromMSecsSinceEpoch (value.toULongLong () * 1000ull, Qt::UTC);
}
QString displayText (QVariant const& value, QLocale const& locale) const override
{
return locale.toString (to_date_time (value), locale.dateFormat (QLocale::ShortFormat) + " hh:mm:ss");
}
QWidget * createEditor (QWidget * parent, QStyleOptionViewItem const& /*option*/, QModelIndex const& /*index*/) const override
{
std::unique_ptr<QDateTimeEdit> editor {new QDateTimeEdit {parent}};
editor->setTimeSpec (Qt::UTC); // needed because it ignores time
// spec of the QDateTime that it is
// set from
return editor.release ();
}
void setEditorData (QWidget * editor, QModelIndex const& index) const override
{
static_cast<QDateTimeEdit *> (editor)->setDateTime (to_date_time (index, Qt::EditRole));
}
void setModelData (QWidget * editor, QAbstractItemModel * model, QModelIndex const& index) const override
{
model->setData (index, to_secs_since_epoch (static_cast<QDateTimeEdit *> (editor)->dateTime ()));
}
void updateEditorGeometry (QWidget * editor, QStyleOptionViewItem const& option, QModelIndex const& /*index*/) const override
{
editor->setGeometry (option.rect);
}
};
#endif