用C++将QTreeWidget和QPlainTextEdit结合起来

以下是将QTreeWidget和QPlainTextEdit结合起来的示例代码：

#include <QtWidgets>

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

    // 创建窗口
    QWidget window;
    window.setWindowTitle("QTreeWidget and QPlainTextEdit Example");

    // 创建QTreeWidget和QPlainTextEdit
    QTreeWidget treeWidget;
    QPlainTextEdit plainTextEdit;

    // 将QTreeWidget和QPlainTextEdit添加到窗口中
    QVBoxLayout *layout = new QVBoxLayout(&window);
    layout->addWidget(&treeWidget);
    layout->addWidget(&plainTextEdit);

    // 设置QTreeWidget
    QStringList headers;
    headers << "Name" << "Size" << "Type";
    treeWidget.setHeaderLabels(headers);

    QTreeWidgetItem *root = new QTreeWidgetItem(&treeWidget);
    root->setText(0, "Root");

    QTreeWidgetItem *file1 = new QTreeWidgetItem(root);
    file1->setText(0, "File 1");
    file1->setText(1, "10 KB");
    file1->setText(2, "Text");

    QTreeWidgetItem *file2 = new QTreeWidgetItem(root);
    file2->setText(0, "File 2");
    file2->setText(1, "20 KB");
    file2->setText(2, "Image");

    // 连接QTreeWidget的itemClicked信号和槽函数
    QObject::connect(&treeWidget, &QTreeWidget::itemClicked, [&](QTreeWidgetItem *item, int column)
    {
        QString text = item->text(0) + " " + item->text(1) + " " + item->text(2);
        plainTextEdit.setPlainText(text);
    });

    // 显示窗口
    window.show();

    return app.exec();
}

这段代码创建了一个窗口，将QTreeWidget和QPlainTextEdit添加进去，并设置了一个简单的QTreeWidget。当QTreeWidget中的一个项目被单击时，将在QPlainTextEdit中显示该项目的文本。