QTreeWidget

main.cpp

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#include <QApplication>
#include <QWidget>
#include <QTreeWidget>
#include <QTreeWidgetItem>
#include <QVBoxLayout>
#include <QHeaderView>
#include <QDebug>

void setupTreeWidgetDemo(QWidget *parent) {
    QVBoxLayout *layout = new QVBoxLayout(parent);

    // --- 1. 创建树插件 ---
    QTreeWidget *treeWidget = new QTreeWidget(parent);

    // 设置列数和表头
    treeWidget->setColumnCount(2);
    treeWidget->setHeaderLabels({"名称", "详情"});

    // 让表头自动伸展
    treeWidget->header()->setSectionResizeMode(QHeaderView::Stretch);

    // --- 2. 创建父节点 A ---
    QTreeWidgetItem *parentItemA = new QTreeWidgetItem(treeWidget);
    parentItemA->setText(0, "水果");
    parentItemA->setIcon(0, parent->style()->standardIcon(QStyle::SP_DirIcon));

    // 为父节点 A 添加子节点
    QTreeWidgetItem *childA1 = new QTreeWidgetItem(parentItemA);
    childA1->setText(0, "苹果");
    childA1->setText(1, "红富士");

    QTreeWidgetItem *childA2 = new QTreeWidgetItem(parentItemA);
    childA2->setText(0, "香蕉");
    childA2->setText(1, "进口");

    // --- 3. 创建父节点 B (带复选框) ---
    QTreeWidgetItem *parentItemB = new QTreeWidgetItem(treeWidget);
    parentItemB->setText(0, "蔬菜");

    QTreeWidgetItem *childB1 = new QTreeWidgetItem(parentItemB);
    childB1->setText(0, "土豆");
    childB1->setCheckState(0, Qt::Unchecked); // 让子节点带复选框

    // 默认展开所有节点
    treeWidget->expandAll();

    // --- 4. 信号槽：点击节点 ---
    QObject::connect(treeWidget, &QTreeWidget::itemClicked, [](QTreeWidgetItem *item, int column) {
        qDebug() << "点击了节点：" << item->text(0) << " 所在列：" << column;
    });

    layout->addWidget(treeWidget);
}

int main(int argc, char *argv[]) {
    QApplication a(argc, argv);
    QWidget w;
    w.setWindowTitle("QTreeWidget 层次结构演示");
    w.resize(400, 300);
    setupTreeWidgetDemo(&w);
    w.show();
    return a.exec();
}