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