QTableView 数据操作

需求：拖动矩形

效果：

#ifndef RECTDELEGATE_H#define RECTDELEGATE_H#include <QItemDelegate>class RectDelegate :public QItemDelegate{    Q_OBJECTpublic:    RectDelegate(QObject *parent = 0);private:    void paint(QPainter* painter,const QStyleOptionViewItem& option,const QModelIndex& index) const;};#endif // RECTDELEGATE_H

#include "rectdelegate.h"#include <QPainter>RectDelegate::RectDelegate(QObject *parent) : QItemDelegate(parent){}void RectDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option,                         const QModelIndex &index) const{    Q_UNUSED(option);    QPoint point = index.data().toPoint();    painter->setBrush(QBrush(QColor(120,120,120)));    painter->drawRect(point.x(), option.rect.y(), point.y(), option.rect.height());}

#ifndef MYVIEW_H#define MYVIEW_H#include <QTableView>class QStandardItemModel;class MyView : public QTableView{    Q_OBJECTpublic:    explicit MyView(QWidget *parent = 0);private:    void setRect(int row, int column, const QPoint &point);    bool pointLeftCheck(const QPoint &pos, const QPoint &point);    bool pointRightCheck(const QPoint &pos, const QPoint &point);protected:    void mousePressEvent(QMouseEvent *event);    void mouseReleaseEvent(QMouseEvent *event);    void mouseMoveEvent(QMouseEvent *event);private:    static const int offset = 2;    int m_Index;    bool m_LeftDown;    bool m_RightDown;    QStandardItemModel *m_Model;};#endif // MYVIEW_H

#include "myview.h"#include "rectdelegate.h"#include <QStandardItemModel>#include <QTableView>#include <QMouseEvent>#include <QHeaderView>MyView::MyView(QWidget *parent) : QTableView(parent){    m_LeftDown = false;    m_RightDown = false;    resize(500,500);    RectDelegate *ck = new RectDelegate();    this->setItemDelegateForColumn(1,ck);    m_Model = new QStandardItemModel();    m_Model->setRowCount(2);    m_Model->setColumnCount(2);    this->setModel(m_Model);    this->verticalHeader()->setDefaultSectionSize(20);    this->setEditTriggers(QAbstractItemView::NoEditTriggers);    //! test    setRect(0,1,QPoint(100,80));}void MyView::setRect(int row, int column, const QPoint &point){    QStandardItem *item = new QStandardItem();    item->setData(point,Qt::DisplayRole);    m_Model->setItem( row, column, item );}bool MyView::pointLeftCheck(const QPoint &pos, const QPoint &point){    return pos.x() > point.x() - offset && pos.x() < point.x() + offset;}bool MyView::pointRightCheck(const QPoint &pos, const QPoint &point){    int width = point.x() + point.y();    return pos.x() > width - offset && pos.x() < width + offset;}void MyView::mousePressEvent(QMouseEvent *event){    QTableView::mousePressEvent(event);    m_Index = currentIndex().row();    QPoint && point = currentIndex().data().toPoint();    QPoint && pos = event->pos();    if(pointLeftCheck(pos, point)){        m_LeftDown = true;        setCursor(Qt::SizeHorCursor);        return;    }else if(pointRightCheck(pos, point)){        m_RightDown = true;        setCursor(Qt::SizeHorCursor);        return;    }    //!......}void MyView::mouseReleaseEvent(QMouseEvent *event){    QTableView::mouseReleaseEvent(event);    setCursor(Qt::ArrowCursor);    m_LeftDown = false;    m_RightDown = false;}void MyView::mouseMoveEvent(QMouseEvent *event){    QTableView::mouseMoveEvent(event);    if(m_Index != currentIndex().row()) return;    QModelIndex && index = currentIndex();    QPoint && point = currentIndex().data().toPoint();    if(m_LeftDown){        point.setY(point.x() + point.y() - event->pos().x());        point.setX(event->pos().x());    }else if(m_RightDown){        point.setY(event->pos().x() - point.x());    }    setRect(index.row(), index.column(), point);}

#include "myview.h"#include <QApplication>int main(int argc, char *argv[]){    QApplication a(argc, argv);    MyView view;    view.show();    return a.exec();}