QTreeWidget使用小案例

一、概述

　　使用QTreeWidget制作一个树形菜单。示例图：

 

二、代码示例

#include "TreeWidgetExampleWindow.h"

TreeWidgetExampleWindow::TreeWidgetExampleWindow(QWidget* parent)
    : QWidget(parent)
{
    this->setWindowTitle("TreeWidget组件");
    QVBoxLayout* vLayout = new QVBoxLayout;

    //创建TreeWidget
    QTreeWidget* treeWidget = new QTreeWidget;
    treeWidget->setColumnCount(3);// 设置列数为 3
    treeWidget->setHeaderLabels({ "LOL", "英雄","战力"}); // 设置列标签
    treeWidget->header()->setSectionResizeMode(QHeaderView::ResizeToContents); // 自适应列宽

    // 创建根节点
    QTreeWidgetItem* root = new QTreeWidgetItem(treeWidget);
    root->setText(0, "英雄联盟");
    root->setData(2, Qt::UserRole, "root_data_info");
    treeWidget->addTopLevelItem(root);

    // 创建子节点 1
    QTreeWidgetItem* child1 = new QTreeWidgetItem(root);//说明child1是root的子节点
    child1->setText(0, "德玛西亚");
    QTreeWidgetItem* child1_sub = new QTreeWidgetItem(child1);//说明child1_sub是child1的子节点
    child1_sub->setText(0, "德玛西亚之力");
    child1->addChild(child1_sub);//添加子节点
    //三级节点一级一级靠右边
    child1_sub->setText(0, "名称");
    child1_sub->setText(1, "德玛西亚");
    child1_sub->setText(2, "战力2");
    root->addChild(child1);

    // 创建子节点 2
    QTreeWidgetItem* child2 = new QTreeWidgetItem(root);//说明child2是root的子节点
    child2->setText(0, "诺克萨斯");
    QTreeWidgetItem* child2_sub = new QTreeWidgetItem(child2);//说明child2_sub是child2的子节点
    child2_sub->setText(0, "诺克萨斯之手");
    child2->addChild(child2_sub);
    child2_sub->setText(0, "101");
    root->addChild(child2);
    

    // 读取节点数据
    QTreeWidgetItem* item = treeWidget->topLevelItem(0);
    if (item) {
        qDebug() << "Root name: " << item->text(0);
        qDebug() << "Root value: " << item->text(1);
        qDebug() << "Root data: " << item->data(2, Qt::UserRole).toString();
    }

    vLayout->addWidget(treeWidget);
    this->setLayout(vLayout);

}

TreeWidgetExampleWindow::~TreeWidgetExampleWindow()
{

}