QTableView内部拖拽和QTableView相互拖拽实现

要实现QTableView内部拖拽和QTableView相互拖拽只需要继承QTableView,然后重写 

void dropEvent(QDropEvent *event);

void startDrag(Qt::DropActions supportedActions);

这两个方法即可实现相应的功能。主要代码如下图所示

#ifndef TABLEVIEW_H
#define TABLEVIEW_H

#include <QTableView>
#include <QMouseEvent>
#include <QDragEnterEvent>
#include<QByteArray>
class TableView : public QTableView
{
    Q_OBJECT
public:
    TableView(QWidget *parent = nullptr);
protected:
     void dropEvent(QDropEvent *event);
     void startDrag(Qt::DropActions supportedActions);
private:
    QPixmap renderToPixmap(const QModelIndex index);
signals:

public slots:

};

#endif // TABLEVIEW_H

#include "tableview.h"
#include<QStandardItemModel>
#include<QStandardItem>
#include<QDrag>
#include<QMimeData>
#include<QWindow>
#include<QPainter>
#include<QByteArray>
#include<QDebug>
TableView::TableView(QWidget *parent) : QTableView(parent)
{
    setDragDropMode(QAbstractItemView::DragDrop);
    setDragEnabled(true);
    setAcceptDrops(true);
    setDropIndicatorShown(true);
    setMouseTracking(true);
    setDragDropOverwriteMode(true);
    QStandardItemModel* model=new QStandardItemModel(this);
    for(int row=0;row<10;row++)
    {
        for(int column=0;column<5;column++)
        {
            QStandardItem* item=new QStandardItem(QString("%1,%2").arg(row).arg(column));
            if(row%2==0)
            {
                item->setIcon(QIcon("://icon1.png"));
            }
            else
            {
                item->setIcon(QIcon("://icon2.png"));
            }
            model->setItem(row,column,item);

        }

    }
    setModel(model);
    resize(600,500);
}

void TableView::dropEvent(QDropEvent *event)
{

    QByteArray itemData=event->mimeData()->data("application/x-qabstractitemmodeldatalist");
    QDataStream stream(&itemData, QIODevice::ReadOnly);
    int  row,col;
    QMap<int,  QVariant> roleDataMap;
    while (!stream.atEnd())
    {
        stream >> row >> col >> roleDataMap;
        //qDebug() << "enter-----row: " << row << " col :" << col << " data:"<< roleDataMap ;
        QString text=roleDataMap.value(0).toString();
        QIcon icon=roleDataMap.value(1).value<QIcon>();
        QModelIndex index=this->indexAt(this->viewport()->mapFromGlobal(QCursor::pos()));
        if(index.isValid())
        {
           // qDebug()<<index;
            this->model()->setData(index,roleDataMap.value(0),Qt::EditRole);
            this->model()->setData(index,roleDataMap.value(1),Qt::DecorationRole);
            setCurrentIndex(index);
        }
        else
        {
            qDebug()<<"drop invalid";
        }
    }
}



void TableView::startDrag(Qt::DropActions supportedActions)
{
    QModelIndexList indexes=this->selectedIndexes();
    if(indexes.count()>0)
    {
        QMimeData *data=this->model()->mimeData(indexes);
        if (!data)
            return;
        QRect rect;
        QPixmap pixmap = renderToPixmap(indexes[0]);
        rect.adjust(horizontalOffset(), verticalOffset(), 0, 0);
        QDrag *drag = new QDrag(this);
        drag->setPixmap(pixmap);
        drag->setMimeData(data);
        drag->setHotSpot(QPoint(pixmap.width() / 2, pixmap.height()/ 2));
        drag->exec(supportedActions|Qt::CopyAction|Qt::MoveAction);
        QByteArray itemData= data->data("application/x-qabstractitemmodeldatalist");
        QDataStream stream(&itemData, QIODevice::ReadOnly);

        int  row,col;
        QMap<int,  QVariant> roleDataMap;
        while (!stream.atEnd())
        {
            stream >> row >> col >> roleDataMap;
            QModelIndex oldIndex=this->model()->index(row,col);
            this->model()->setData(oldIndex,"",Qt::EditRole);
            this->model()->setData(oldIndex,"",Qt::DecorationRole);
            //qDebug() << "row: " << row << " col :" << col << " data:"<< roleDataMap ;
            QString text=roleDataMap.value(0).toString();
            QIcon icon=roleDataMap.value(1).value<QIcon>();
            QModelIndex index=this->indexAt(this->viewport()->mapFromGlobal(QCursor::pos()));
            if(index.isValid())
            {
               // qDebug()<<index;
                this->model()->setData(index,roleDataMap.value(0),Qt::EditRole);
                this->model()->setData(index,roleDataMap.value(1),Qt::DecorationRole);
                setCurrentIndex(index);
            }
            else
            {
                qDebug()<<"inner move invalid";
            }
        }
    }

}





QPixmap TableView::renderToPixmap(const QModelIndex index)
{
    const QRect viewportRect = this->viewport()->rect();
    const QRect indexRect = this->visualRect(index);
    QRect rect;
    if(indexRect.intersects(viewportRect)) {
        rect |= indexRect;
    }
    rect&=viewportRect;
    qreal scale = 1.0f;
    QWidget *window = this->window();
    if (window) {
        QWindow *windowHandle = window->windowHandle();
        if (windowHandle)
            scale = windowHandle->devicePixelRatio();
    }
    QPixmap pixmap(rect.size() * scale);
    pixmap.setDevicePixelRatio(scale);
    pixmap.fill(Qt::transparent);
    QPainter painter(&pixmap);
    QStyleOptionViewItem option = this->viewOptions();
    //option.state |= QStyle::State_Selected;
    option.rect=indexRect.translated(-rect.topLeft());
    this->itemDelegate()->paint(&painter, option, index);
    return pixmap;
}

代码下载地址