Qt tableWidget 表格打印预览案例编码

以下是一个基于 Qt 的 TableWidget 表格打印预览案例编码：

#include <QtPrintSupport/QPrintDialog>
#include <QtPrintSupport/QPrinter>
#include <QtWidgets/QApplication>
#include <QtWidgets/QTableWidget>
#include <QtWidgets/QVBoxLayout>
#include <QtWidgets/QHeaderView>
#include <QtWidgets/QPushButton>

class TablePrinter : public QObject {
    Q_OBJECT
public:
    TablePrinter(QTableWidget *tableWidget, QObject *parent = nullptr) : QObject(parent), tableWidget(tableWidget) {}

    void print() {
        QPrinter printer(QPrinter::HighResolution);
        printer.setPageSize(QPrinter::A4);
        printer.setOrientation(QPrinter::Portrait);

        QPrintDialog dialog(&printer, nullptr);
        if (dialog.exec() == QDialog::Rejected) {
            return;
        }

        QPainter painter(&printer);
        painter.setRenderHint(QPainter::Antialiasing);
        painter.setRenderHint(QPainter::TextAntialiasing);

        int rowsPerPage = printer.pageRect().height() / tableWidget->rowHeight(0);
        int totalRows = tableWidget->rowCount();
        int totalPages = (totalRows + rowsPerPage - 1) / rowsPerPage;

        for (int page = 1; page <= totalPages; ++page) {
            painter.drawText(10, 10, QString("Page %1 of %2").arg(page).arg(totalPages));

            int y = 50;
            painter.drawLine(10, y, printer.pageRect().width() - 10, y);
            y += 5;

            int rowStart = (page - 1) * rowsPerPage;
            int rowEnd = qMin(rowStart + rowsPerPage, totalRows);

            for (int i = rowStart; i < rowEnd; ++i) {
                int x = 10;
                for (int j = 0; j < tableWidget->columnCount(); ++j) {
                    int colWidth = tableWidget->columnWidth(j);
                    painter.drawText(x, y, colWidth, tableWidget->rowHeight(i), Qt::AlignLeft | Qt::AlignVCenter,
                                     tableWidget->item(i, j)->text());
                    x += colWidth;
                }
                y += tableWidget->rowHeight(i);
            }

            if (page < totalPages) {
                printer.newPage();
            }
        }
    }

private:
    QTableWidget *tableWidget;
};

int main(int argc, char *argv[]) {
    QApplication app(argc, argv);

    QTableWidget tableWidget;
    tableWidget.setColumnCount(3);
    tableWidget.setRowCount(50);
    tableWidget.setHorizontalHeaderLabels(QStringList() << "Name" << "Age" << "Gender");

    for (int i = 0; i < 50; ++i) {
        tableWidget.setItem(i, 0, new QTableWidgetItem(QString("Name %1").arg(i)));
        tableWidget.setItem(i, 1, new QTableWidgetItem(QString::number(20 + i)));
        tableWidget.setItem(i, 2, new QTableWidgetItem((i % 2 == 0) ? "Male" : "Female"));
    }

    QPushButton printButton("Print");
    QObject::connect(&printButton, &QPushButton::clicked, [&tableWidget]() {
        TablePrinter printer(&tableWidget);
        printer.print();
    });

    QVBoxLayout layout;
    layout.addWidget(&tableWidget);
    layout.addWidget(&printButton);

    QWidget widget;
    widget.setLayout(&layout);
    widget.show();

    return app.exec();
}

在这个案例中，我们创建了一个包含 50 行 3 列的 TableWidget，并填充了一些数据。我们还创建了一个打印按钮，当用户点击该按钮时，会弹出一个打印对话框，用户可以选择打印机和打印选项。当用户确定打印后，程序会将表格分成多个页面，并逐页打印。每个页面都包含表格的一部分，并显示当前页数和总页数。