QTableWidget分页和排序

左手的ㄟ右手 2022-09-12 11:44 1阅读 0赞

本例程演示了在将所有数据存储到成员变量后，根据每页显示记录数量对表格数据进行分页展示，且提供了切换页面的按钮和输入框。  
在支持分页后，同时处理了表头的点击事件，将页面数据进行重排，使用了C++ 11的lamda函数。  
在Qt5.14.2中编译测试通过。  
代码粘贴如下：

main.cpp

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

dialog.h

#ifndef DIALOG_H
    #define DIALOG_H
    
    #include <QDialog>
    
    QT_BEGIN_NAMESPACE
    namespace Ui {  class Dialog; }
    QT_END_NAMESPACE
    
    class Dialog : public QDialog
    { 
        Q_OBJECT
    
    public:
        Dialog(QWidget *parent = nullptr);
        ~Dialog();
    
        void gotoPage(int page);
        void gotoPrevPage() { if (pageNum > 1) --pageNum;}
        void gotoNextPage() { if (pageNum < pageCount) ++pageNum;}
        void gotoFirstPage() { pageNum = 1;}
        void gotoLastPage() { pageNum = pageCount;}
        void gotoThePage(int num) { pageNum = num;}
    
    private slots:
        void sortByColumn(int column);
    
        void on_nextPageBtn_clicked();
    
        void on_prevPageBtn_clicked();
    
        void on_firstPageBtn_clicked();
    
        void on_lastPageBtn_clicked();
    
        void on_goPageBtn_clicked();
    
    private:
        void initData();
        void updateTable();
    
        Ui::Dialog *ui;
        int pageSize;
        int pageCount;
        int pageNum;
    
        QList<QStringList> dataList;
    };
    #endif // DIALOG_H

dialog.cpp

#include "dialog.h"
    #include "ui_dialog.h"
    #include <QDebug>
    
    Dialog::Dialog(QWidget *parent)
        : QDialog(parent),
          ui(new Ui::Dialog),
          pageSize(2),
          pageCount(0),
          pageNum(1)
    { 
        ui->setupUi(this);
    
        initData();
        updateTable();
        connect(ui->tableWidget->horizontalHeader(), SIGNAL(sectionClicked(int)), this, SLOT(sortByColumn(int)));
    }
    
    Dialog::~Dialog()
    { 
        delete ui;
    }
    
    void Dialog::initData()
    { 
        // 初始化所有数据
        QStringList rowData;
    
        rowData.clear();
        rowData << "张三" << "成都市";
        dataList.append(rowData);
    
        rowData.clear();
        rowData << "李四" << "天津市";
        dataList.append(rowData);
    
        rowData.clear();
        rowData << "王五" << "南京市";
        dataList.append(rowData);
    
        rowData.clear();
        rowData << "赵六" << "保定市";
        dataList.append(rowData);
    
        rowData.clear();
        rowData << "孙七" << "石家庄市";
        dataList.append(rowData);
    
        rowData.clear();
        rowData << "吴八" << "乌鲁木齐市";
        dataList.append(rowData);
    
        rowData.clear();
        rowData << "杨九" << "邯郸市";
        dataList.append(rowData);
    
        pageCount = dataList.size() / pageSize + (dataList.size() % pageSize ? 1 : 0);
    
        // 初始化表头
        QStringList headerList;
        headerList << "姓名" << "位置";
        ui->tableWidget->setColumnCount(headerList.size());
        ui->tableWidget->horizontalHeader()->setSectionResizeMode(1, QHeaderView::Stretch);
        ui->tableWidget->setHorizontalHeaderLabels(headerList);
        ui->tableWidget->setSortingEnabled(true);
    }
    
    void Dialog::updateTable()
    { 
        ui->spinPageBox->setValue(pageNum);
        ui->pageLabel->setText(QString("第 %1 页 共 %2 页").arg(pageNum).arg(pageCount));
        ui->firstPageBtn->setDisabled(pageNum == 1);
        ui->prevPageBtn->setDisabled(pageNum == 1);
        ui->lastPageBtn->setDisabled(pageNum == pageCount);
        ui->nextPageBtn->setDisabled(pageNum == pageCount);
    
        ui->tableWidget->clearContents();
    
        int minRow = (pageNum - 1) * pageSize;
        int maxRow = pageNum * pageSize;
        if (maxRow > dataList.size())
        { 
            maxRow = dataList.size();
        }
        ui->tableWidget->setRowCount(maxRow - minRow);
        for(int row = minRow; row < maxRow; row++)
        { 
            QStringList rowList = dataList.at(row);
            for (int col = 0; col < rowList.size(); col++)
            { 
                ui->tableWidget->setItem(row - minRow, col, new QTableWidgetItem(rowList.at(col)));
            }
        }
    }
    
    void Dialog::sortByColumn(int column)
    { 
        if(column == -1 || dataList.isEmpty())
            return;
    
        const bool isAsc = ui->tableWidget->horizontalHeader()->sortIndicatorOrder() == Qt::AscendingOrder;
        std::sort(dataList.begin(), dataList.end(), [column, isAsc, this](const QStringList &left, const QStringList &right){ 
            const QString &leftValue = left.at(column);
            const QString &rightValue = right.at(column);
            return isAsc ? (leftValue.toLocal8Bit() < rightValue.toLocal8Bit()) : (leftValue.toLocal8Bit() > rightValue.toLocal8Bit());
        });
        updateTable();
    }
    
    void Dialog::on_nextPageBtn_clicked()
    { 
        gotoNextPage();
        updateTable();
    }
    
    void Dialog::on_prevPageBtn_clicked()
    { 
        gotoPrevPage();
        updateTable();
    }
    
    void Dialog::on_firstPageBtn_clicked()
    { 
        gotoFirstPage();
        updateTable();
    }
    
    void Dialog::on_lastPageBtn_clicked()
    { 
        gotoLastPage();
        updateTable();
    }
    
    void Dialog::on_goPageBtn_clicked()
    { 
        gotoThePage(ui->spinPageBox->value());
        updateTable();
    }