如何在Qt上实现一个考勤表，并提供示例代码

我不知道您需要的是什么样的考勤表，但是以下是一个简单的示例，它创建一个基本的考勤表，并允许用户添加、删除和编辑条目。

mainwindow.h：

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QStandardItemModel>

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit MainWindow(QWidget *parent = nullptr);
    ~MainWindow();

private slots:
    void on_addButton_clicked();
    void on_deleteButton_clicked();
    void on_saveButton_clicked();
    void on_loadButton_clicked();
    void on_tableView_doubleClicked(const QModelIndex &index);

private:
    Ui::MainWindow *ui;
    QStandardItemModel *model;
};

#endif // MAINWINDOW_H

mainwindow.cpp：

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QStandardItem>
#include <QFileDialog>
#include <QMessageBox>

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

    // Create the model and set it on the table view
    model = new QStandardItemModel(this);
    model->setColumnCount(3);
    model->setHorizontalHeaderLabels(QStringList() << "Name" << "Date" << "Status");
    ui->tableView->setModel(model);
}

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

void MainWindow::on_addButton_clicked()
{
    // Create a new row and add it to the model
    QList<QStandardItem*> row;
    row.append(new QStandardItem("New Person"));
    row.append(new QStandardItem(QDate::currentDate().toString(Qt::ISODate)));
    row.append(new QStandardItem("Absent"));
    model->appendRow(row);
}

void MainWindow::on_deleteButton_clicked()
{
    // Get the selected row and remove it from the model
    QModelIndexList indexes = ui->tableView->selectionModel()->selectedRows();
    if (indexes.size() == 1) {
        int row = indexes.first().row();
        model->removeRow(row);
    }
}

void MainWindow::on_saveButton_clicked()
{
    // Open a dialog to choose the file to save to
    QString fileName = QFileDialog::getSaveFileName(this, "Save File", "", "CSV Files (*.csv)");
    if (fileName.isEmpty()) {
        return;
    }

    // Open the file for writing
    QFile file(fileName);
    if (!file.open(QIODevice::WriteOnly | QIODevice::Text)) {
        QMessageBox::critical(this, "Error", "Could not save file.");
        return;
    }

    // Write the data to the file
    QTextStream out(&file);
    out << "Name,Date,Status\n";
    for (int row = 0; row < model->rowCount(); ++row) {
        QString name = model->item(row, 0)->text();
        QString date = model->item(row, 1)->text();
        QString status = model->item(row, 2)->text();
        out << name << "," << date << "," << status << "\n";
    }

    // Close the file
    file.close();
}

void MainWindow::on_loadButton_clicked()
{
    // Open a dialog to choose the file to load from
    QString fileName = QFileDialog::getOpenFileName(this, "Load File", "", "CSV Files (*.csv)");
    if (fileName.isEmpty()) {
        return;
    }

    // Open the file for reading
    QFile file(fileName);
    if (!file.open(QIODevice::ReadOnly | QIODevice::Text)) {
        QMessageBox::critical(this, "Error", "Could not load file.");
        return;
    }

    // Clear the current model and read the data from the file
    model->clear();
    model->setColumnCount(3);
    model->setHorizontalHeaderLabels(QStringList() << "Name" << "Date" << "Status");
    QTextStream in(&file);
    in.readLine(); // Skip the header line
    while (!in.atEnd()) {
        QString line = in.readLine();
        QStringList fields = line.split(",");
        QList<QStandardItem*> row;
        row.append(new QStandardItem(fields.at(0)));
        row.append(new QStandardItem(fields.at(1)));
        row.append(new QStandardItem(fields.at(2)));
        model->appendRow(row);
    }

    // Close the file
    file.close();
}

void MainWindow::on_tableView_doubleClicked(const QModelIndex &index)
{
    // Allow the user to edit the status field by double-clicking on it
    if (index.column() == 2) {
        ui->tableView->edit(index);
    }
}

这个示例使用一个QStandardItemModel来存储考勤表的数据，并将其设置为QTableView的模型。它包括按钮和双击编辑功能，以便用户可以添加、删除和编辑条目。它还包括保存和加载功能，允许用户将考勤表保存为CSV文件并从CSV文件加载。请注意，这个示例假定CSV文件格式为“Name,Date,Status”。如果您需要不同的格式，请相应地修改代码。