Qt自定义委托在QTableView中绘制控件、图片、文字

自定义委托，继承于，QStyledItemDelegate类，重载Paint()函数，

1、实现在QTableView中绘制 格式字符串

2、实现在QTableView中绘制进度条

3、实现在QTableView中绘制QCheckBox

4、实现在QTableView中绘制星星

5、实现在QTableView中绘制Pixmap图片

 

 

 

1、实现在QTableView中绘制 格式字符串

 

 //重载绘制函数
 void DelReconQueue::paint(QPainter *painter, const QStyleOptionViewItem &option,
                           const QModelIndex &index) const
 {
     //如果是第2列'病人Id'
     if (index.column() == 2)
     {
         //获得当前项值
         int patientId = index.model()->data(index, Qt::DisplayRole).toInt();
         //设置'病人Id'格式字符串: P:00000x;6位10进制数，不足补0;
         QString text = QString("P:%1").arg(patientId, 6, 10, QChar('0'));


         //获取项风格设置
         QStyleOptionViewItem myOption = option;
         myOption.displayAlignment = Qt::AlignRight | Qt::AlignVCenter;
     //绘制文本
     QApplication::style()->drawItemText ( painter, myOption.rect , myOption.displayAlignment, QApplication::palette(), true,text );


     }
 else
     {
         //否则调用默认委托
         QStyledItemDelegate::paint(painter, option, index);
     }

 }

 

   如果自定义委托继承于QItemDelegate类，绘制字符串，可以直接用QItemDelegate中的drawDisplay();

 

 void TrackDelegate::paint(QPainter *painter,
                           const QStyleOptionViewItem &option,
                           const QModelIndex &index) const
 {
     //保存音轨的列
     if (index.column() == durationColumn) {
         //获得索引对应Model中的数据
         int secs = index.model()->data(index, Qt::DisplayRole).toInt();
         //设置时间格式字符串 分:秒
         QString text = QString("%1:%2")
                        .arg(secs / 60, 2, 10, QChar('0'))
                        .arg(secs % 60, 2, 10, QChar('0'));
         //获取项风格设置
         QStyleOptionViewItem myOption = option;
         myOption.displayAlignment = Qt::AlignRight | Qt::AlignVCenter;
         //绘制文本
         drawDisplay(painter, myOption, myOption.rect, text);
         //如果当前有焦点，就绘制一个焦点矩形，否则什么都不做
         drawFocus(painter, myOption, myOption.rect);
     } else{
         //否则默认
         QItemDelegate::paint(painter, option, index);
     }
 }

  

2、实现在QTableView中绘制进度条

 //重载绘制函数
 void DelReconQueue::paint(QPainter *painter, const QStyleOptionViewItem &option,
                           const QModelIndex &index) const
 {
     //如果是'已经完成子任务数'
      if (index.column() == 9)
     {
         const QAbstractItemModel *itemModel = index.model();
         //获得索引对应Model中的数据
         int finishedSubTaskNum = itemModel->data(index, Qt::DisplayRole).toInt();
         int subTaskNum = itemModel->data(itemModel->index(index.row(),8), Qt::DisplayRole).toInt();

         //进度条的风格选项
         QStyleOptionProgressBarV2 *progressBarOption = new QStyleOptionProgressBarV2();
         progressBarOption->rect = option.rect;
         progressBarOption->minimum = 0;
         progressBarOption->maximum = subTaskNum;
         progressBarOption->progress = finishedSubTaskNum;
         int t = finishedSubTaskNum/subTaskNum;
         progressBarOption->text = QString::number(t) + "%";
         progressBarOption->textVisible = true;
         //绘制进度条
         QApplication::style()->drawControl(QStyle::CE_ProgressBar, progressBarOption, painter);

     }
    else
     {
         //否则调用默认委托
         QStyledItemDelegate::paint(painter, option, index);
     }

 }

  3、实现在QTableView中绘制QCheckBox

 

 

 #include <QtGui>
 #include <QItemDelegate>
 #include <QStyleOptionProgressBarV2>
 #include "DelReconQueue.h"
 //重载绘制函数
 void DelReconQueue::paint(QPainter *painter, const QStyleOptionViewItem &option,
                           const QModelIndex &index) const
 {
      if (index.column() == 11)
     {
         //获取值
         bool checked = index.model()->data(index, Qt::DisplayRole).toBool();
         //按钮的风格选项
         QStyleOptionButton *checkBoxOption = new QStyleOptionButton();
         checkBoxOption->state |= QStyle::State_Enabled;
         //根据值判断是否选中
         if(checked)
         {
             checkBoxOption->state |= QStyle::State_On;
         }
         else
         {
             checkBoxOption->state |= QStyle::State_Off;
         }
         //返回QCheckBox几何形状
         checkBoxOption->rect = CheckBoxRect(option);
         //绘制QCheckBox
         QApplication::style()->drawControl(QStyle::CE_CheckBox,checkBoxOption,painter);

     }

     else
     {
         //否则调用默认委托
         QStyledItemDelegate::paint(painter, option, index);
     }

 }

    //生成QCheckBox

 QRect DgSystemLog::CheckBoxRect(const QStyleOptionViewItem &viewItemStyleOptions)const
 {
     //绘制按钮所需要的参数
     QStyleOptionButton checkBoxStyleOption;
     //按照给定的风格参数 返回元素子区域
     QRect checkBoxRect = QApplication::style()->subElementRect( QStyle::SE_CheckBoxIndicator, &checkBoxStyleOption);
     //返回QCheckBox坐标
     QPoint checkBoxPoint(viewItemStyleOptions.rect.x() + viewItemStyleOptions.rect.width() / 2 - checkBoxRect.width() / 2,
                          viewItemStyleOptions.rect.y() + viewItemStyleOptions.rect.height() / 2 - checkBoxRect.height() / 2);
     //返回QCheckBox几何形状
     return QRect(checkBoxPoint, checkBoxRect.size());
 }

 

 

4、实现在QTableView中绘制自定义类 星星

 

 //重载绘制函数
 void StarDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option,
                          const QModelIndex &index) const
 {
     //如果某项数据是星星类型
     if (qVariantCanConvert<StarRating>(index.data())) {
         //获取该项数据，并转换成StarRating类型
         StarRating starRating = qVariantValue<StarRating>(index.data());
         //如果有控件被选中，我们就让选中的控件变亮
         if (option.state & QStyle::State_Selected)
             painter->fillRect(option.rect, option.palette.highlight());

         starRating.paint(painter, option.rect, option.palette,
                          StarRating::ReadOnly);
     }
     //如果没有控件选中，调用默认委托
     else {
         QStyledItemDelegate::paint(painter, option, index);
     }
 }

 

星星自定义源文件

 

 #ifndef STARRATING_H
 #define STARRATING_H

 #include <QMetaType>
 #include <QPointF>
 #include <QVector>

 class StarRating
 {
 public:
     enum EditMode { Editable, ReadOnly };

     StarRating(int starCount = 1, int maxStarCount = 5);

     void paint(QPainter *painter, const QRect &rect,
                const QPalette &palette, EditMode mode) const;
     QSize sizeHint() const;
     int starCount() const { return myStarCount; }
     int maxStarCount() const { return myMaxStarCount; }
     void setStarCount(int starCount) { myStarCount = starCount; }
     void setMaxStarCount(int maxStarCount) { myMaxStarCount = maxStarCount; }

 private:
     QPolygonF starPolygon;
     QPolygonF diamondPolygon;
     int myStarCount;
     int myMaxStarCount;
 };

 //让所有模板类型都知道该类，包括QVariant
 Q_DECLARE_METATYPE(StarRating)

 #endif



 #include <QtGui>
 #include <math.h>

 #include "starrating.h"

 const int PaintingScaleFactor = 20;

 StarRating::StarRating(int starCount, int maxStarCount)
 {
     myStarCount = starCount;
     myMaxStarCount = maxStarCount;

     starPolygon << QPointF(1.0, 0.5);
     for (int i = 1; i < 5; ++i)
         starPolygon << QPointF(0.5 + 0.5 * cos(0.8 * i * 3.14),
                                0.5 + 0.5 * sin(0.8 * i * 3.14));

     diamondPolygon << QPointF(0.4, 0.5) << QPointF(0.5, 0.4)
                    << QPointF(0.6, 0.5) << QPointF(0.5, 0.6)
                    << QPointF(0.4, 0.5);
 }

 QSize StarRating::sizeHint() const
 {
     return PaintingScaleFactor * QSize(myMaxStarCount, 1);
 }

 void StarRating::paint(QPainter *painter, const QRect &rect,
                        const QPalette &palette, EditMode mode) const
 {
     painter->save();

     painter->setRenderHint(QPainter::Antialiasing, true);
     painter->setPen(Qt::NoPen);

     if (mode == Editable) {
         painter->setBrush(palette.highlight());
     } else {
         painter->setBrush(palette.foreground());
     }

     int yOffset = (rect.height() - PaintingScaleFactor) / 2;
     painter->translate(rect.x(), rect.y() + yOffset);
     //画笔坐标
     painter->scale(PaintingScaleFactor, PaintingScaleFactor);

     for (int i = 0; i < myMaxStarCount; ++i) {
         if (i < myStarCount) {
             painter->drawPolygon(starPolygon, Qt::WindingFill);
         } else if (mode == Editable) {
             painter->drawPolygon(diamondPolygon, Qt::WindingFill);
         }
         painter->translate(1.0, 0.0);
     }

     painter->restore();
 }

 5、实现在QTableView中绘制Pixmap图片 ，

详细请看具体例子 Qt-在表格(QTableView)中插入图片

 

 void MyItemDelegate::paint(QPainter * painter,
                            const QStyleOptionViewItem & option,
                            const QModelIndex & index) const
 {
     if(index.column()!=0){
         QItemDelegate::paint(painter,option,index);
         return;
     }
     const QAbstractItemModel * model=index.model();
     QVariant var=model->data(index,Qt::CheckStateRole);
     if(var.isNull()) var=false;
     const QPixmap & star=var.toBool()?
 favouritePixmap:notFavouritePixmap;

     int width=star.width();
     int height=star.height();
     QRect rect=option.rect;
     int x=rect.x()+rect.width()/2-width/2;
     int y=rect.y()+rect.height()/2-height/2;

     painter->drawPixmap(x,y,star);
 }