Qt表格分页，跳转，首尾页_qt如何获取第2页

简介

1.使用QTableWidget实现了首页，上下页切换，尾页，以及跳转。

上代码

widget.h
#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>

QT_BEGIN_NAMESPACE
namespace Ui { class Widget; }
QT_END_NAMESPACE

class Widget : public QWidget
{
    Q_OBJECT

public:
    Widget(QWidget *parent = nullptr);
    ~Widget();

    void updataPage();
    void updataPageData();

    void initHeader(const QStringList &headers);

    void addLogData(const QVariantList &data);

    void addLogDatas(const QList<QVariantList> &datas);
private slots:
    void on_pushButton_3_clicked();

    void on_pushButton_clicked();

    void on_pushButton_2_clicked();

    void on_pushButton_4_clicked();

    void on_pushButton_5_clicked();

private:
    Ui::Widget *ui;

    QList<QVariantList> m_lDatas;
    int currentPageSum;
    int pageSum;
    int currentPage;
};
#endif // WIDGET_H

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widget.cpp
#include "widget.h"
#include "ui_widget.h"

Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);

    initHeader(QStringList() << "行号" << "内容");

    currentPageSum = 50;
    currentPage = 1;


    for (int i = 1; i <= 100000; i++) {
        QVariantList varList;
        varList << i << QString("测试");
        m_lDatas.push_back(varList);
    }
    addLogDatas(m_lDatas);
}

Widget::~Widget()
{
    delete ui;
}

void Widget::updataPage()
{
    if (m_lDatas.size() <= 50) {
        pageSum = 1;
    }
    if ((m_lDatas.size() % 50) == 0) {
        pageSum = m_lDatas.size() / 50;

    }
    else {
        pageSum = (m_lDatas.size() / 50) + 1;
    }

    ui->label->setText(QString("%1/%2").arg(currentPage).arg(pageSum));
}

void Widget::updataPageData()
{
    if (currentPage == 0) {
        return;
    }

    //获取具体下标 （当前页号*当前页的总数）-当前页的总数）= 某一页的第一个的具体数据下标
    int index = (currentPage * currentPageSum) - currentPageSum;


    //删除
    for(int row = ui->logTabWidget->rowCount() - 1;row >= 0; row--)
    {
        ui->logTabWidget->removeRow(row);
    }

    int i = 0;
    for (; index < m_lDatas.size(); ++index) {
        if (index >= (currentPage * currentPageSum)) {
            break;
        }

        int rowcount = ui->logTabWidget->rowCount();
        ui->logTabWidget->insertRow(rowcount);

        QVariantList varList = m_lDatas.at(index);

        for (int j = 0; j < varList.size(); ++j) {
            QTableWidgetItem* item = new QTableWidgetItem();
            item->setData(0, varList.at(j));
            item->setTextAlignment(Qt::AlignHCenter | Qt::AlignVCenter);
            ui->logTabWidget->setItem(i, j, item);
        }
        i++;
    }
}

void Widget::initHeader(const QStringList &headers)
{
    ui->logTabWidget->setColumnCount(headers.size());
    ui->logTabWidget->setHorizontalHeaderLabels(headers);
    ui->logTabWidget->verticalHeader()->setHidden(false);

    ui->logTabWidget->setEditTriggers(QAbstractItemView::NoEditTriggers);
    ui->logTabWidget->setColumnWidth(0, 20);
    ui->logTabWidget->horizontalHeader()->setSectionResizeMode(QHeaderView::Stretch);    //x先自适应宽度

    QHeaderView *header = ui->logTabWidget->verticalHeader();
    header->setHidden(true);// 隐藏行号
}

void Widget::addLogData(const QVariantList &data)
{
    m_lDatas.append(data);
    updataPageData();
    updataPage();
}

void Widget::addLogDatas(const QList<QVariantList> &datas)
{
    //m_lDatas = datas;
    currentPage = 1;
    updataPageData();
    updataPage();
}


void Widget::on_pushButton_3_clicked()
{
    //首页
    currentPage = 1;
    updataPageData();
    updataPage();
}

void Widget::on_pushButton_clicked()
{
    //上一页
    if (currentPage == 1) {
        return;
    }

    currentPage--;
    updataPageData();
    updataPage();
}

void Widget::on_pushButton_2_clicked()
{
    //下一页
    if (currentPage >= pageSum) {
        return;
    }
    currentPage++;
    updataPageData();
    updataPage();
}

void Widget::on_pushButton_4_clicked()
{
    //尾页
    currentPage = pageSum;
    updataPageData();
    updataPage();

}

void Widget::on_pushButton_5_clicked()
{
    //跳转
    if (ui->spinBox->value() > pageSum
            || currentPage == ui->spinBox->value()
            || ui->spinBox->value() == 0
            || pageSum == 1) {
        return;
    }
    currentPage = ui->spinBox->value();
    updataPageData();
    updataPage();
}

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