Localizing dates and times in item views

From QtCentreWiki

This article is obsolete since version 4.3. QItemDelegate is fully locale-aware since Qt 4.3.

Problem

In Qt versions 4.2 and older, how to localize dates and times in item views while proper sorting and editing is retained?

Solution

Rendering

To make dates and times rendered as localized, make your model return them as localized strings for Qt::DisplayRole. This will make views calculate sufficient sizes for localized dates and times out of the box.

Editing

To make suitable editors appear for dates and times, make your model return actual dates and times for Qt::EditRole:

Data type	Editor
QDate	QDateEdit
QTime	QTimeEdit
QDateTime	QDateTimeEdit

Sorting

For proper sorting, set Qt::EditRole as QSortFilterProxyModel's sortRole.

Example

QVariant Model::data(const QModelIndex& index, int role) const
{
    ...
    switch (role)
    {
        case Qt::DisplayRole:
            return dateTime.toString(...);

        case Qt::EditRole:
            return dateTime;

        ...
    }
}

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jpn 15:29, 10 July 2007 (CEST)