QTDateTime and timestamp delegate in QTableView

From QT Wikipedia

Delegate purpose is to display human readable date format from timestamp.

timeeditdelegate.h

 
#ifndef TIMEEDITDELEGATE_H
#define TIMEEDITDELEGATE_H
 
#include <QItemDelegate>
 
class TimeEditDelegate : public QItemDelegate
 {
     Q_OBJECT
 
 public:
     TimeEditDelegate(const QString timeFormat = "dd.MM.yyyy hh:mm:ss",QObject *parent = 0) : QItemDelegate(parent) {this->timeformat = timeFormat;};
     void paint(QPainter *painter, const QStyleOptionViewItem &option,
               const QModelIndex &index) const; 
 
 private:
     QString timeformat;
 };
 
#endif
 

timeeditdelegate.cpp

 
#include "timeeditdelegate.h"
 
#include <QModelIndex>
#include <QPainter>
#include <QDateTime>
 
void TimeEditDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option,
                         const QModelIndex &index) const
{
    int datetime = index.model()->data(index, Qt::DisplayRole).toInt();
 
    QString indexvalue = "";
 
    if (datetime > 0)
    {
        QDateTime dateTime2 = QDateTime();
        dateTime2.setTime_t(datetime);
        indexvalue = dateTime2.toString(this->timeformat);
    }
    else
    {
        indexvalue = tr("Date not set");
    }
 
    Q_ASSERT(index.isValid());
 
    QStyleOptionViewItemV3 opt = setOptions(index, option);
 
    const QStyleOptionViewItemV2 *v2 = qstyleoption_cast<const QStyleOptionViewItemV2 *>(&option);
    opt.features = v2 ? v2->features
                    : QStyleOptionViewItemV2::ViewItemFeatures(QStyleOptionViewItemV2::None);
    const QStyleOptionViewItemV3 *v3 = qstyleoption_cast<const QStyleOptionViewItemV3 *>(&option);
    opt.locale = v3 ? v3->locale : QLocale();
    opt.widget = v3 ? v3->widget : 0;
 
    // prepare
    painter->save();
 
    painter->setClipRect(opt.rect);
 
    // get the data and the rectangles
    QVariant value;
 
    QPixmap pixmap;
    QRect decorationRect;
    value = index.data(Qt::DecorationRole);
 
    QString text;
    QRect displayRect;
    value = index.data(Qt::DisplayRole);
    if (value.isValid()) {
        text = indexvalue;
        displayRect = textRectangle(painter, option.rect, opt.font, text);
    }
 
    QRect checkRect;
    Qt::CheckState checkState = Qt::Unchecked;
    value = index.data(Qt::CheckStateRole);
    if (value.isValid()) {
        checkState = static_cast<Qt::CheckState>(value.toInt());
        checkRect = check(opt, opt.rect, value);
    }
 
    // do the layout
    doLayout(opt, &checkRect, &decorationRect, &displayRect, false);
    // draw the item
 
    drawBackground(painter, opt, index);
    drawCheck(painter, opt, checkRect, checkState);
    drawDecoration(painter, opt, decorationRect, pixmap);
    drawDisplay(painter, opt, displayRect, text);
    drawFocus(painter, opt, displayRect);
 
    // done
    painter->restore();
}
 

Usage example

 
//...
    ui.ClientTableView->setItemDelegateForColumn(7,new TimeEditDelegate("dd.MM.yyyy"));
//...
 

So now instead of number in table field you will see nice date :)