Qt QTableView显示日期时间格式

我们会经常做一些表格显示信息，其中经常有日期时间信息。

当使用Qt的Model/View时，如果你用view自带的delegate，显示的时间可能不能符合要求。

这就需要我们编写新的delegate类。以下是一个专门用于显示日期时间的delegate类“TimeEditDelegate”，取自Qt Wiki，我做了改动。

.h文件

#ifndefTIMEEDITDELEGATE_H
#defineTIMEEDITDELEGATE_H
#include<QItemDelegate>
class
TimeEditDelegate:
public
QItemDelegate
{
Q_OBJECT
public
:
TimeEditDelegate(const
QStringtimeFormat=
"dd.MM.yyyyhh:mm:ss"
,QObject*parent=0):QItemDelegate(parent)
{this
->timeformat=timeFormat;};
void
paint(QPainter*painter,
const
QStyleOptionViewItem&option,
const
QModelIndex&index)
const
;
private
:
QStringtimeformat;
};
#endif//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_H

.cpp文件

#include"timeeditdelegate.h"
#include<QModelIndex>
#include<QPainter>
#include<QDateTime>
#include<QStyleOptionViewItemV3>
#include<QStyleOptionViewItemV2>
void
TimeEditDelegate::paint(QPainter*painter,
const
QStyleOptionViewItem&option,
const
QModelIndex&index)
const
{
QDateTimedtval=index.model()->data(index,Qt::DisplayRole).toDateTime();
QStringindexvalue=tr("Datenotset"
);
if
(dtval.isValid())
{
indexvalue=dtval.toString(timeformat);
}
Q_ASSERT(index.isValid());
QStyleOptionViewItemV3opt=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);
//getthedataandtherectangles
QVariantvalue;
QPixmappixmap;
QRectdecorationRect;
value=index.data(Qt::DecorationRole);
QStringtext;
QRectdisplayRect;
value=index.data(Qt::DisplayRole);
if
(value.isValid()){
text=indexvalue;
displayRect=textRectangle(painter,option.rect,opt.font,text);
}
QRectcheckRect;
Qt::CheckStatecheckState=Qt::Unchecked;
value=index.data(Qt::CheckStateRole);
if
(value.isValid()){
checkState=static_cast
<Qt::CheckState>(value.toInt());
checkRect=check(opt,opt.rect,value);
}
//dothelayout
doLayout(opt,&checkRect,&decorationRect,&displayRect,false
);
//drawtheitem
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();
}

#include "timeeditdelegate.h"
#include <QModelIndex>
#include <QPainter>
#include <QDateTime>
#include <QStyleOptionViewItemV3>
#include <QStyleOptionViewItemV2>
void TimeEditDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option,
                         const QModelIndex &index) const
{
    QDateTime dtval = index.model()->data(index, Qt::DisplayRole).toDateTime();
    QString indexvalue = tr("Date not set");
    if(dtval.isValid())
    {
        indexvalue = dtval.toString(timeformat);
    }
    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();
}

使用方法

View->setItemDelegateForColumn(c,
new
TimeEditDelegate(
"yyyy-dd-MM"
));

View->setItemDelegateForColumn(c, new TimeEditDelegate("yyyy-dd-MM"));

其中，c是需要显示日期时间的列号。"yyyy-dd-MM"是显示的格式。两个中文常用格式为：

yyyy-dd-MM 例子：2009-12-25

yyyy-dd-MM hh:mm:ss 例子：2009-12-25 12:25:32