【QT】多层QTreeWidget与QStackedWidget的关联操作

通过点击多层QTreeWidget来控制QStackedWidget中的page页面切换

1. treeWidget设计
   
   

treeWidget设计：

    // treeWidget设计
    ui->treeWidget->clear();
    ui->treeWidget->setColumnCount(1);
    //第一层
    QStringList l;
    l<<"管理系统";
    QTreeWidgetItem *pf = new QTreeWidgetItem(ui->treeWidget,l);
    ui->treeWidget->addTopLevelItem(pf);

    //第二层
    l.clear();
    l<<"学生管理";
    QTreeWidgetItem *p1 = new QTreeWidgetItem(pf,l);
    l.clear();
    l<<"管理员管理";
    QTreeWidgetItem *p2= new QTreeWidgetItem(pf,l);
    pf->addChild(p1);
    pf->addChild(p2);


    //第三层
    l.clear();
    l<<"学校学生信息管理";
    QTreeWidgetItem *pi = new QTreeWidgetItem(p1,l);
    l.clear();
    l<<"学校学生成绩管理";
    QTreeWidgetItem *ps = new QTreeWidgetItem(p1,l);
    p1->addChild(pi);
    p1->addChild(ps);

    //第四层
    l.clear();
    l<<"2020级";
    QTreeWidgetItem *p20 = new QTreeWidgetItem(ps,l);
    l.clear();
    l<<"2021级";
    QTreeWidgetItem *p21 = new QTreeWidgetItem(ps,l);
    l.clear();
    l<<"2022级";
    QTreeWidgetItem *p22 = new QTreeWidgetItem(ps,l);
    l.clear();
    l<<"2023级";
    QTreeWidgetItem *p23 = new QTreeWidgetItem(ps,l);
    //父          子
    ps->addChild(p20);
    ps->addChild(p21);
    ps->addChild(p22);
    ps->addChild(p23);

    //第五层
    l.clear();
    l<<"自动化专业";
    QTreeWidgetItem *p201 = new QTreeWidgetItem(p20,l);
    l.clear();
    l<<"智能科学与技术专业";
    QTreeWidgetItem *p202 = new QTreeWidgetItem(p20,l);
    //父          子
    p20->addChild(p201);
    p20->addChild(p202);

    l.clear();
    l<<"自动化专业";
    QTreeWidgetItem *p211 = new QTreeWidgetItem(p21,l);
    l.clear();
    l<<"智能科学与技术专业";
    QTreeWidgetItem *p212 = new QTreeWidgetItem(p21,l);
    //父          子
    p21->addChild(p211);
    p21->addChild(p212);

    l.clear();
    l<<"自动化专业";
    QTreeWidgetItem *p221 = new QTreeWidgetItem(p22,l);
    l.clear();
    l<<"智能科学与技术专业";
    QTreeWidgetItem *p222 = new QTreeWidgetItem(p22,l);
    //父          子
    p22->addChild(p221);
    p22->addChild(p222);

    l.clear();
    l<<"自动化专业";
    QTreeWidgetItem *p231 = new QTreeWidgetItem(p23,l);
    l.clear();
    l<<"智能科学与技术专业";
    QTreeWidgetItem *p232 = new QTreeWidgetItem(p23,l);
    //父          子
    p23->addChild(p231);
    p23->addChild(p232);


    //第六层
    //20-自动化
    l.clear();
    l<<"1班";
    QTreeWidgetItem *p2011 = new QTreeWidgetItem(p201,l);
    l.clear();
    l<<"2班";
    QTreeWidgetItem *p2012 = new QTreeWidgetItem(p201,l);
    l.clear();
    l<<"3班";
    QTreeWidgetItem *p2013 = new QTreeWidgetItem(p201,l);
    //父          子
    p201->addChild(p2011);
    p201->addChild(p2012);
    p201->addChild(p2013);

    //20-智科
    l.clear();
    l<<"1班";
    QTreeWidgetItem *p2021 = new QTreeWidgetItem(p202,l);
    l.clear();
    l<<"2班";
    QTreeWidgetItem *p2022 = new QTreeWidgetItem(p202,l);
    //父          子
    p202->addChild(p2021);
    p202->addChild(p2022);


    //21-自动化
    l.clear();
    l<<"1班";
    QTreeWidgetItem *p2111 = new QTreeWidgetItem(p211,l);
    l.clear();
    l<<"2班";
    QTreeWidgetItem *p2112 = new QTreeWidgetItem(p211,l);
    l.clear();
    l<<"3班";
    QTreeWidgetItem *p2113 = new QTreeWidgetItem(p211,l);
    //父          子
    p211->addChild(p2111);
    p211->addChild(p2112);
    p211->addChild(p2113);

    //21-智科
    l.clear();
    l<<"1班";
    QTreeWidgetItem *p2121 = new QTreeWidgetItem(p212,l);
    l.clear();
    l<<"2班";
    QTreeWidgetItem *p2122 = new QTreeWidgetItem(p212,l);
    //父          子
    p212->addChild(p2121);
    p212->addChild(p2122);


    //22-自动化
    l.clear();
    l<<"1班";
    QTreeWidgetItem *p2211 = new QTreeWidgetItem(p221,l);
    l.clear();
    l<<"2班";
    QTreeWidgetItem *p2212 = new QTreeWidgetItem(p221,l);
    l.clear();
    l<<"3班";
    QTreeWidgetItem *p2213 = new QTreeWidgetItem(p221,l);
    //父          子
    p221->addChild(p2211);
    p221->addChild(p2212);
    p221->addChild(p2213);

    //20-智科
    l.clear();
    l<<"1班";
    QTreeWidgetItem *p2221 = new QTreeWidgetItem(p222,l);
    l.clear();
    l<<"2班";
    QTreeWidgetItem *p2222 = new QTreeWidgetItem(p222,l);
    //父          子
    p222->addChild(p2221);
    p222->addChild(p2222);


    //23-自动化
    l.clear();
    l<<"1班";
    QTreeWidgetItem *p2311 = new QTreeWidgetItem(p231,l);
    l.clear();
    l<<"2班";
    QTreeWidgetItem *p2312 = new QTreeWidgetItem(p231,l);
    l.clear();
    l<<"3班";
    QTreeWidgetItem *p2313 = new QTreeWidgetItem(p231,l);
    //父          子
    p231->addChild(p2311);
    p231->addChild(p2312);
    p231->addChild(p2313);

    //20-智科
    l.clear();
    l<<"1班";
    QTreeWidgetItem *p2321 = new QTreeWidgetItem(p232,l);
    l.clear();
    l<<"2班";
    QTreeWidgetItem *p2322 = new QTreeWidgetItem(p232,l);
    //父          子
    p232->addChild(p2321);
    p232->addChild(p2322);
    ui->treeWidget->expandAll();

2. 关联
   
   
   选择on_treeWidget_itemClicked()函数
   重点是使用setCurrentWidget()和 判断语句

item->text(column) == "3班" 
&& item->parent() && item->parent()->text(column) == "自动化专业" 
&& item->parent()->parent() &&      item->parent()->parent()->text(column) == "2020级"

完整语句：

void MainWindow::on_treeWidget_itemClicked(QTreeWidgetItem *item, int column)
{
    // 获取当前点击的项的文本
    // QString clickedItemText = item->text(column);

    // 根据点击的项进行处理
    if(item->text(column)=="学校学生信息管理")
    {
        ui->stackedWidget->setCurrentWidget(ui->pg_StuInfo);
    }
    else if(item->text(column)=="学校学生成绩管理")
    {
        ui->stackedWidget->setCurrentWidget(ui->pg_score);
    }
    else if (item->text(column) == "1班" && item->parent() && item->parent()->text(column) == "自动化专业" && item->parent()->parent() &&
             item->parent()->parent()->text(column) == "2020级")
    {
        ui->stackedWidget->setCurrentWidget(ui->pg_20auto1);
    }
    else if (item->text(column) == "2班" && item->parent() && item->parent()->text(column) == "自动化专业" && item->parent()->parent() &&
             item->parent()->parent()->text(column) == "2020级")
    {
        ui->stackedWidget->setCurrentWidget(ui->pg_20auto1);
    }
    else if (item->text(column) == "3班" && item->parent() && item->parent()->text(column) == "自动化专业" && item->parent()->parent() &&
             item->parent()->parent()->text(column) == "2020级")
    {
        ui->stackedWidget->setCurrentWidget(ui->pg_20auto1);
    }
    else if (item->text(column) == "1班" && item->parent() && item->parent()->text(column) == "智能科学与技术专业" && item->parent()->parent() &&
             item->parent()->parent()->text(column) == "2020级")
    {
        ui->stackedWidget->setCurrentWidget(ui->pg_20auto1);
    }
    else if (item->text(column) == "2班" && item->parent() && item->parent()->text(column) == "智能科学与技术专业" && item->parent()->parent() &&
             item->parent()->parent()->text(column) == "2020级")
    {
        ui->stackedWidget->setCurrentWidget(ui->pg_20auto1);
    }
    else if (item->text(column) == "1班" && item->parent() && item->parent()->text(column) == "自动化专业" && item->parent()->parent() &&
             item->parent()->parent()->text(column) == "2021级")
    {
        ui->stackedWidget->setCurrentWidget(ui->pg_20auto1);
    }
    else if (item->text(column) == "2班" && item->parent() && item->parent()->text(column) == "自动化专业" && item->parent()->parent() &&
             item->parent()->parent()->text(column) == "2021级")
    {
        ui->stackedWidget->setCurrentWidget(ui->pg_20auto1);
    }
    else if (item->text(column) == "3班" && item->parent() && item->parent()->text(column) == "自动化专业" && item->parent()->parent() &&
             item->parent()->parent()->text(column) == "2021级")
    {
        ui->stackedWidget->setCurrentWidget(ui->pg_20auto1);
    }
    else if (item->text(column) == "1班" && item->parent() && item->parent()->text(column) == "智能科学与技术专业" && item->parent()->parent() &&
             item->parent()->parent()->text(column) == "2021级")
    {

        ui->stackedWidget->setCurrentWidget(ui->pg_20auto1);
    }
    else if (item->text(column) == "2班" && item->parent() && item->parent()->text(column) == "智能科学与技术专业" && item->parent()->parent() &&
             item->parent()->parent()->text(column) == "2021级")
    {
        ui->stackedWidget->setCurrentWidget(ui->pg_20auto1);
    }
    else if (item->text(column) == "1班" && item->parent() && item->parent()->text(column) == "自动化专业" && item->parent()->parent() &&
             item->parent()->parent()->text(column) == "2022级")
    {
        ui->stackedWidget->setCurrentWidget(ui->pg_20auto1);
    }
    else if (item->text(column) == "2班" && item->parent() && item->parent()->text(column) == "自动化专业" && item->parent()->parent() &&
             item->parent()->parent()->text(column) == "2022级")
    {
        ui->stackedWidget->setCurrentWidget(ui->pg_20auto1);
    }
    else if (item->text(column) == "3班" && item->parent() && item->parent()->text(column) == "自动化专业" && item->parent()->parent() &&
             item->parent()->parent()->text(column) == "2022级")
    {
        ui->stackedWidget->setCurrentWidget(ui->pg_20auto1);
    }
    else if (item->text(column) == "1班" && item->parent() && item->parent()->text(column) == "智能科学与技术专业" && item->parent()->parent() &&
             item->parent()->parent()->text(column) == "2022级")
    {
        ui->stackedWidget->setCurrentWidget(ui->pg_20auto1);
    }
    else if (item->text(column) == "2班" && item->parent() && item->parent()->text(column) == "智能科学与技术专业" && item->parent()->parent() &&
             item->parent()->parent()->text(column) == "2022级")
    {
        ui->stackedWidget->setCurrentWidget(ui->pg_20auto1);
    }
    else if (item->text(column) == "1班" && item->parent() && item->parent()->text(column) == "自动化专业" && item->parent()->parent() &&
             item->parent()->parent()->text(column) == "2023级")
    {
        ui->stackedWidget->setCurrentWidget(ui->pg_20auto1);
    }
    else if (item->text(column) == "2班" && item->parent() && item->parent()->text(column) == "自动化专业" && item->parent()->parent() &&
             item->parent()->parent()->text(column) == "2023级")
    {
        ui->stackedWidget->setCurrentWidget(ui->pg_20auto1);
    }
    else if (item->text(column) == "3班" && item->parent() && item->parent()->text(column) == "自动化专业" && item->parent()->parent() &&
             item->parent()->parent()->text(column) == "2023级")
    {
        ui->stackedWidget->setCurrentWidget(ui->pg_20auto1);
    }
    else if (item->text(column) == "1班" && item->parent() && item->parent()->text(column) == "智能科学与技术专业" && item->parent()->parent() &&
             item->parent()->parent()->text(column) == "2023级")
    {
        ui->stackedWidget->setCurrentWidget(ui->pg_20auto1);
    }
    else if (item->text(column) == "2班" && item->parent() && item->parent()->text(column) == "智能科学与技术专业" && item->parent()->parent() &&
             item->parent()->parent()->text(column) == "2023级")
    {
        ui->stackedWidget->setCurrentWidget(ui->pg_20auto1);
    }

}