大家好，又见面了，我是你们的朋友全栈君。如果您正在找激活码,请点击查看最新教程,关注关注公众号 “全栈程序员社区” 获取激活教程,可能之前旧版本教程已经失效.最新Idea2022.1教程亲测有效,一键激活。

Jetbrains全系列IDE稳定放心使用

QtreeWidget简介

QtreeWidget会有一个默认的 columncount的property。如下：

在这里插入图片描述

    //qtreewidget 默认的columncount property属性
    /*
    qtreewidget默认的columncount为1.可以通过setcolumncount()把它设置为一个多列的qtreewidget
    */
    ui->treeWidget_2->setColumnCount(2);
    QTreeWidgetItem* topItem1 = new QTreeWidgetItem(ui->treeWidget_2);
    topItem1->setText(0, "百度");
    topItem1->setText(1, "蒙牛");
    ui->treeWidget_2->addTopLevelItem(topItem1);

    QTreeWidgetItem* topItem2 = new QTreeWidgetItem(ui->treeWidget_2);
    topItem2->setText(0, "腾讯");
    topItem2->setText(1, "伊利");
    ui->treeWidget_2->addTopLevelItem(topItem2);

    //ui->treeWidget_2->setHeaderHidden(true); //隐藏qtreewidget的头部
    QStringList strList;
    strList << "互联网公司" << "食品公司";
    ui->treeWidget_2->setHeaderLabels(strList); //自定义qtreewidget的头部

设置右键菜单并实现添加一个子项删除一个子项的功能

Widget::Widget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Widget)
{
    ui->setupUi(this);
    //设置顶层节点
    QTreeWidgetItem* topItem = new QTreeWidgetItem(ui->treeWidget);
    topItem->setText(0, "百度");
    ui->treeWidget->addTopLevelItem(topItem);
    ui->treeWidget->setHeaderHidden(true);

    //qtreewidget 默认的columncount property属性
    /*
    qtreewidget默认的columncount为1.可以通过setcolumncount()把它设置为一个多列的qtreewidget
    */
    ui->treeWidget_2->setColumnCount(2);
    QTreeWidgetItem* topItem1 = new QTreeWidgetItem(ui->treeWidget_2);
    topItem1->setText(0, "百度");
    topItem1->setText(1, "蒙牛");
    ui->treeWidget_2->addTopLevelItem(topItem1);

    //为顶层节点添加子节点
    QTreeWidgetItem* subItem1 = new QTreeWidgetItem();
    subItem1->setText(0, "人事部");
    topItem1->addChild(subItem1);

    QTreeWidgetItem* subItem2 = new QTreeWidgetItem();
    subItem2->setText(0, "财务部");
    topItem1->addChild(subItem2);

    QTreeWidgetItem* topItem2 = new QTreeWidgetItem(ui->treeWidget_2);
    topItem2->setText(0, "腾讯");
    topItem2->setText(1, "伊利");
    ui->treeWidget_2->addTopLevelItem(topItem2);

    //ui->treeWidget_2->setHeaderHidden(true); //隐藏qtreewidget的头部
    QStringList strList;
    strList << "互联网公司" << "食品公司";
    ui->treeWidget_2->setHeaderLabels(strList); //自定义qtreewidget的头部

    //设置右键菜单选项
    //允许右键菜单
    ui->treeWidget_2->setContextMenuPolicy(Qt::CustomContextMenu);
    //设置菜单
    QMenu *myMenu = new QMenu(ui->treeWidget_2);
    QAction *add = myMenu->addAction("添加");
    QAction *del = myMenu->addAction("删除");

    //响应右键菜单信号
    connect(ui->treeWidget_2, &QTreeWidget::customContextMenuRequested, this, [=](const QPoint pos){
        qDebug() << "x: " << pos.x() << " y: " << pos.y();
        myMenu->exec(ui->treeWidget_2->mapToGlobal(pos));
    });

    //响应添加的action点击
    connect(add, &QAction::triggered, this, [=](){
        //添加一个固定的子节点
        QTreeWidgetItem *item = new QTreeWidgetItem();
        item->setText(0, "营销部");
        topItem1->addChild(item);
    });
    //响应删除的action点击
    connect(del, &QAction::triggered, this, [=](){
        qDebug() << topItem1->childCount();
        if(topItem1->childCount() >= 1)
        {
            QTreeWidgetItem *item = topItem1->child(topItem1->childCount() - 1);
            topItem1->removeChild(item);
            delete item;
            item = nullptr;
        }
    });
}

这样有两个缺点 1. 只能添加特定的子项。2. 不能实现不同层级节点的不同菜单。

通过弹出dialog的方式询问用户，添加用户自定义的子项
添加一个dialog界面

dialog.h

#ifndef DIALOG_H
#define DIALOG_H

#include <QDialog>
#include <QString>

namespace Ui {
class Dialog;
}

class Dialog : public QDialog
{
    Q_OBJECT

public:
    explicit Dialog(QWidget *parent = 0);
    ~Dialog();

public:
    QString partmenName;

private:
    Ui::Dialog *ui;
};

#endif // DIALOG_H

dialog.cpp

#include "dialog.h"
#include "ui_dialog.h"

Dialog::Dialog(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::Dialog),
    partmenName("")
{
    ui->setupUi(this);
    connect(ui->pushButton, &QPushButton::clicked, this, [&](){
        if(ui->lineEdit->text() != "")
        {
            partmenName = ui->lineEdit->text();
        }
        this->accept();
    });
    connect(ui->pushButton_2, &QPushButton::clicked, this, [=](){
        this->reject();
    });
}

Dialog::~Dialog()
{
    delete ui;
}

widget.cpp

#include "widget.h"
#include "ui_widget.h"
#include <QString>
#include <QStringList>
#include <QMenu>
#include <QPoint>
#include <QDebug>

Widget::Widget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Widget)
{
    ui->setupUi(this);
    //设置顶层节点
    QTreeWidgetItem* topItem = new QTreeWidgetItem(ui->treeWidget);
    topItem->setText(0, "百度");
    ui->treeWidget->addTopLevelItem(topItem);
    ui->treeWidget->setHeaderHidden(true);

    //qtreewidget 默认的columncount property属性
    /*
    qtreewidget默认的columncount为1.可以通过setcolumncount()把它设置为一个多列的qtreewidget
    */
    ui->treeWidget_2->setColumnCount(2);
    QTreeWidgetItem* topItem1 = new QTreeWidgetItem(ui->treeWidget_2);
    topItem1->setText(0, "百度");
    topItem1->setText(1, "蒙牛");
    ui->treeWidget_2->addTopLevelItem(topItem1);

    //为顶层节点添加子节点
    QTreeWidgetItem* subItem1 = new QTreeWidgetItem();
    subItem1->setText(0, "人事部");
    topItem1->addChild(subItem1);

    QTreeWidgetItem* subItem2 = new QTreeWidgetItem();
    subItem2->setText(0, "财务部");
    topItem1->addChild(subItem2);

    QTreeWidgetItem* topItem2 = new QTreeWidgetItem(ui->treeWidget_2);
    topItem2->setText(0, "腾讯");
    topItem2->setText(1, "伊利");
    ui->treeWidget_2->addTopLevelItem(topItem2);

    //ui->treeWidget_2->setHeaderHidden(true); //隐藏qtreewidget的头部
    QStringList strList;
    strList << "互联网公司" << "食品公司";
    ui->treeWidget_2->setHeaderLabels(strList); //自定义qtreewidget的头部

    //设置右键菜单选项
    //允许右键菜单
    ui->treeWidget_2->setContextMenuPolicy(Qt::CustomContextMenu);
    //设置菜单
    QMenu *myMenu = new QMenu(ui->treeWidget_2);
    QAction *add = myMenu->addAction("添加");
    QAction *del = myMenu->addAction("删除");

    //响应右键菜单信号
    connect(ui->treeWidget_2, &QTreeWidget::customContextMenuRequested, this, [=](const QPoint pos){
        qDebug() << "x: " << pos.x() << " y: " << pos.y();
        myMenu->exec(ui->treeWidget_2->mapToGlobal(pos));
    });

    //响应添加的action点击
    connect(add, &QAction::triggered, this, [=](){
        //添加一个固定的子节点
        if(dlg.exec() == QDialog::Accepted)
        {
            QTreeWidgetItem *item = new QTreeWidgetItem();
            item->setText(0, dlg.partmenName);
            topItem1->addChild(item);
        }
    });
    //响应删除的action点击
    connect(del, &QAction::triggered, this, [=](){
        qDebug() << topItem1->childCount();
        if(topItem1->childCount() >= 1)
        {
            QTreeWidgetItem *item = topItem1->child(topItem1->childCount() - 1);
            topItem1->removeChild(item);
            delete item;
            item = nullptr;
        }
    });
}

Widget::~Widget()
{
    delete ui;
}

widget.h

#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>
#include <QTreeWidget>
#include <QTreeWidgetItem>
#include "dialog.h"
#include "ui_dialog.h"

namespace Ui {
class Widget;
}

class Widget : public QWidget
{
    Q_OBJECT

public:
    explicit Widget(QWidget *parent = 0);
    ~Widget();

private:
    Ui::Widget *ui;
    Dialog dlg;
};

#endif // WIDGET_H

还可以通过TYPE属性来确定每一个节点的层级。
在这里插入图片描述
代码实现
mainwindow.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    //设置这是一个多列的treewidget
    ui->treeWidget->setColumnCount(2);
    //设置表头
    QStringList strList;
    strList << "互联网公司" << "食品公司";
    ui->treeWidget->setHeaderLabels(strList);

    //设置topItem
    QTreeWidgetItem *topItem1 = new QTreeWidgetItem(TYPE_1);
    topItem1->setText(0, "百度");
    topItem1->setText(1, "蒙牛");
    ui->treeWidget->addTopLevelItem(topItem1);

    //为topItem添加子Item
    QTreeWidgetItem *item1 = new QTreeWidgetItem(TYPE_2);
    item1->setText(0, "事业部");
    topItem1->addChild(item1);

    //为topItem添加子Item
    QTreeWidgetItem *item2 = new QTreeWidgetItem(TYPE_2);
    item2->setText(0, "营销部");
    topItem1->addChild(item2);

    //开启右键菜单属性
    ui->treeWidget->setContextMenuPolicy(Qt::CustomContextMenu);
    QMenu *myMenu = new QMenu(ui->treeWidget);
    QAction *add = myMenu->addAction("添加");
    QAction *del = myMenu->addAction("删除");
    connect(ui->treeWidget, &QTreeWidget::customContextMenuRequested, this, [=](const QPoint pos){
        auto itemList = ui->treeWidget->selectedItems(); //得到选中的itemList,默认情况下是不可以多选的
        if(itemList.size() < 1) //异常情况下直接返回
        {
            return;
        }
        int type = itemList.first()->type(); //获取选中状态的item的类型
        if(type == TYPE_1) //如果是一级item就弹出菜单栏
        {
            myMenu->exec(ui->treeWidget->mapToGlobal(pos));
        }
    });

    //为两个action设置对应功能
    connect(add, &QAction::triggered, this, [=](){
        if(dlg.exec() == QDialog::Accepted)
        {
            QTreeWidgetItem *item = new QTreeWidgetItem(TYPE_2);
            item->setText(0, dlg.getPartmentName());
            topItem1->addChild(item);
        }
    });

    connect(del, &QAction::triggered, this, [=](){
        if(topItem1->childCount() >= 1)
        {
            topItem1->removeChild(topItem1->child(topItem1->childCount() - 1));
        }
    });
}

MainWindow::~MainWindow()
{
    delete ui;
}

mainwindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QTreeWidget>
#include <QTreeWidgetItem>
#include <QString>
#include <QStringList>
#include <QMenu>
#include <QAction>
#include <QPoint>
#include "dialog.h"

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();

private:
    Ui::MainWindow *ui;
    Dialog dlg;
};

enum TYPE
{
    TYPE_1,
    TYPE_2,
};

#endif // MAINWINDOW_H

dialog.cpp

#include "dialog.h"
#include "ui_dialog.h"

Dialog::Dialog(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::Dialog)
{
    ui->setupUi(this);
    connect(ui->pushButton, &QPushButton::clicked, this, [&](){
        if(ui->lineEdit->text() != "")
        {
            partmentName = ui->lineEdit->text();
        }
        this->accept();
    });
    connect(ui->pushButton_2, &QPushButton::clicked, this, [=](){
        this->reject();
    });
}

Dialog::~Dialog()
{
    delete ui;
}

QString Dialog::getPartmentName()
{
    return partmentName;
}

dialog.h

#ifndef DIALOG_H
#define DIALOG_H

#include <QDialog>
#include <QString>

namespace Ui {
class Dialog;
}

class Dialog : public QDialog
{
    Q_OBJECT

public:
    explicit Dialog(QWidget *parent = 0);
    ~Dialog();
    QString getPartmentName();

private:
    Ui::Dialog *ui;
    QString partmentName;
};

#endif // DIALOG_H

在这里插入图片描述
参考博客