Qt5中表格处理大数据量

// ModelViewTable.h#pragma once
#include #include "ui_ModelViewTable.h"
class QStandardItemModel;class QMenu;
class ModelViewTable : public QWidget{    Q_OBJECT
public:    ModelViewTable(QWidget *parent = Q_NULLPTR);    void generateDataSet();    void addRowRecord(int row);
    void setColumnItem(int row, int column, QString ip);
public slots:    void slotShowContextMenu(const QPoint& point);private:    Ui::ModelViewTableClass ui;    QStandardItemModel * m_model;    QMenu* m_contextMenu;};
// ModelViewTable.cpp#include "ModelViewTable.h"
#include #include #include #include #include 
#include "CustomStandardItem.h"
ModelViewTable::ModelViewTable(QWidget *parent)    : QWidget(parent){    ui.setupUi(this);
    //////////////////////////设置表头/////////////////////    m_model = new QStandardItemModel(this);    m_model->setColumnCount(3);    m_model->setHeaderData(0, Qt::Horizontal, QStringLiteral("终端IP"));    m_model->setHeaderData(1, Qt::Horizontal, QStringLiteral("CPU使用率"));    m_model->setHeaderData(2, Qt::Horizontal, QStringLiteral("内存使用率"));
    ui.tableView->resizeColumnsToContents(); // 自适应列宽    ui.tableView->setSortingEnabled(true); // 可以按列来排序    ui.tableView->setModel(m_model);    ui.tableView->horizontalHeader()->setDefaultAlignment(Qt::AlignHCenter);    ui.tableView->horizontalHeader()->setFont(QFont("Times",10,QFont::Bold));
    ui.tableView->setSelectionBehavior(QAbstractItemView::SelectRows); //整行选中    ui.tableView->setEditTriggers(QAbstractItemView::NoEditTriggers);// 表格单元格为只读    ui.tableView->setContextMenuPolicy(Qt::CustomContextMenu); // 可以自定义右键菜单
    m_contextMenu = new QMenu(this);    QAction *processAct = new QAction(QStringLiteral("进程列表信息"),m_contextMenu);    QAction *windowAppsAct = new QAction(QStringLiteral("窗口应用列表信息"),m_contextMenu);    m_contextMenu->addAction(processAct);    m_contextMenu->addAction(windowAppsAct);
    connect(ui.tableView, SIGNAL(customContextMenuRequested(const QPoint&)),        this, SLOT(slotShowContextMenu(const QPoint&)));

}
void ModelViewTable::generateDataSet(){    for (int i = 0; i < 3000; ++i)    {        addRowRecord(i);    }}
void ModelViewTable::addRowRecord(int row){    // 每行3列    QString ip = QString("%1.%2.%3.%4").arg(192).arg(168).arg(1).arg(row);    setColumnItem(row, 0, ip);
    QString cpu = QString("%1").arg((row * 10) % 100);    setColumnItem(row, 1, cpu);
    QString mem = QString("%1").arg((row * 12)  % 100);    setColumnItem(row, 2, mem);
}
void ModelViewTable::slotShowContextMenu(const QPoint& point){    QModelIndex index = ui.tableView->indexAt(point);    if (index.isValid())    {        m_contextMenu->exec(QCursor::pos());    }}
void ModelViewTable::setColumnItem(int row, int column, QString ip){    m_model->setItem(row, column, new CustomStandardItem(ip));    m_model->item(row, column)->setTextAlignment(Qt::AlignCenter);}

//   CustomStandardItem.h#pragma once
#include #include 
//  自定义数值排序class CustomStandardItem : public QStandardItem{   // Q_OBJECT
public:    CustomStandardItem();    CustomStandardItem(const CustomStandardItem& other);    CustomStandardItem(const QString &text);    CustomStandardItem & operator =(const CustomStandardItem& other);    ~CustomStandardItem();
public:    virtual bool operator<(const QStandardItem& other) const override;
};
//CustomStandardItem.cpp#include "CustomStandardItem.h"
#include 
CustomStandardItem::CustomStandardItem(){}
CustomStandardItem::CustomStandardItem(const CustomStandardItem& other)    :QStandardItem(other){
}
CustomStandardItem::CustomStandardItem(const QString &text)    :QStandardItem(text){
}
CustomStandardItem::~CustomStandardItem(){}
CustomStandardItem & CustomStandardItem::operator=(const CustomStandardItem& other){    QStandardItem::operator=(other);    return *this;}
bool CustomStandardItem::operator<(const QStandardItem& other) const{    const QVariant left = data(Qt::DisplayRole), right = other.data(Qt::DisplayRole);    //   第1到2列，全部采用浮点数的大小排序    if (column() == other.column() && other.column() >= 1 && other.column() <= 2)    {        return left.toDouble() < right.toDouble();    }
    return QStandardItem::operator<(other);}