qt中创键树形控件QTreeWidget与QStackWidget相绑定

引言

实现点击下拉列表的项对应的跳转到相应的堆栈窗口，且每个堆栈窗口中都有各自的树形控件，更换可执行文件所在目录下的文件data.json后，点击更新按钮，可以更新所有堆栈窗口的树形控件。

效果

示例

下面是实现代码：
main.cpp

#include "dialog.h"

#include 

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    Dialog w;
    w.show();
    return a.exec();
}

dialog.h

#ifndef DIALOG_H
#define DIALOG_H

#include 
#include 
#include 
#include 

typedef struct sceneInfo
{
    QString     name;//场景名
    QString     id;//场景id
}ST_SCENEINFO;
typedef ST_SCENEINFO stuSceneInfo;

typedef QMap<QString,QList<stuSceneInfo>> mapGroupScene;//键-group,值-组下的所有的场景（场景名和id）

typedef struct groupScene
{
    int               sid;//组名(可以为空字符串)
    mapGroupScene     group;//组下的所有场景的名称
}ST_GROUPSCENE;
typedef ST_GROUPSCENE stuGroupScene;


QT_BEGIN_NAMESPACE
namespace Ui { class Dialog; }
QT_END_NAMESPACE

class Dialog : public QDialog
{
    Q_OBJECT

public:
    Dialog(QWidget *parent = nullptr);
    ~Dialog();
private:
    void initInterface();//初始化界面
    void initCombox();//初始化下拉列表
    void initTreeWidget();//初始化树状列表
    void initStackWidgetHw();//初始化华为堆栈窗口
    void initStackWidgetTx();//初始化腾讯堆栈窗口
    void initStackWidgetWy();//初始化网易堆栈窗口
    void initStackWidgetXm();//初始化小木堆栈窗口
    void createTreeWidget(mapGroupScene &groupTree,QTreeWidget *widget);//创建树状图
    void deleteAllTreeItem();//删除所有页的所有树状项


    QByteArray readJsonFile();//读json文件
    void parseJson(QByteArray &byteArray);//解析json字符串
private slots:
    void onCurrentIndexWidget(int index);//选择下拉列表中的项，对应的窗口也改变
    void on_updateBtn_clicked();//更新树状控件

private:
    Ui::Dialog *ui;
    QMap<int,stuGroupScene>      m_sceneInfo;//场景信息，键-sid,值-屏组下的组列表

};
#endif // DIALOG_H

dialog.cpp

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

Dialog::Dialog(QWidget *parent)
    : QDialog(parent)
    , ui(new Ui::Dialog)
{
    ui->setupUi(this);
    QByteArray byteArray = readJsonFile();
    parseJson(byteArray);
    initInterface();
}

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

void Dialog::initInterface()
{
    initCombox();
    initTreeWidget();
}

void Dialog::initCombox()
{
    QStringList strCompany;
    strCompany<<QStringLiteral("华为")<<QStringLiteral("腾讯")<<QStringLiteral("网易")
    <<QStringLiteral("小米");
    ui->comboBox->addItems(strCompany);
    void (QComboBox:: *currentIndex)(int index) = &QComboBox::currentIndexChanged;
    connect(ui->comboBox,currentIndex,this,&Dialog::onCurrentIndexWidget);
}

void Dialog::initTreeWidget()
{
    initStackWidgetHw();
    initStackWidgetTx();
    initStackWidgetWy();
    initStackWidgetXm();
}

void Dialog::initStackWidgetHw()
{
    ui->treeWidget->setColumnCount(1);//设置有1列
    ui->treeWidget->header()->hide();//设置隐藏头

    QMap<int,stuGroupScene>::iterator it = m_sceneInfo.find(1);
    if (it != m_sceneInfo.end()) {
        stuGroupScene hwScene = it.value();
        mapGroupScene hwGroupTree = hwScene.group;
        createTreeWidget(hwGroupTree,ui->treeWidget);
    }
}

void Dialog::initStackWidgetTx()
{
    ui->treeWidget_2->setColumnCount(1);
    ui->treeWidget_2->header()->hide();

    QMap<int,stuGroupScene>::iterator it = m_sceneInfo.find(4);
    if (it != m_sceneInfo.end()) {
        stuGroupScene txScene = it.value();
        mapGroupScene txGroupTree = txScene.group;
        createTreeWidget(txGroupTree,ui->treeWidget_2);
    }
}

void Dialog::initStackWidgetWy()
{
    ui->treeWidget_3->setColumnCount(1);
    ui->treeWidget_3->header()->hide();

    QMap<int,stuGroupScene>::iterator it = m_sceneInfo.find(9);
    if (it != m_sceneInfo.end()) {
        stuGroupScene wyScene = it.value();
        mapGroupScene wyGroupTree = wyScene.group;
        createTreeWidget(wyGroupTree,ui->treeWidget_3);
    }
}

void Dialog::initStackWidgetXm()
{
    ui->treeWidget_4->setColumnCount(1);
    ui->treeWidget_4->header()->hide();

    QMap<int,stuGroupScene>::iterator it = m_sceneInfo.find(12);
    if (it != m_sceneInfo.end()) {
        stuGroupScene xmScene = it.value();
        mapGroupScene xmGroupTree = xmScene.group;
        createTreeWidget(xmGroupTree,ui->treeWidget_4);
    }
}

void Dialog::createTreeWidget(mapGroupScene &groupTree,QTreeWidget *widget)
{
    QMap<QString,QList<stuSceneInfo>>::iterator it;
    for (it = groupTree.begin(); it != groupTree.end(); ++it) {
        if (!it.key().isEmpty()) {
            QTreeWidgetItem *rootItem = new QTreeWidgetItem(widget,QStringList(QString(it.key())));
            QList<stuSceneInfo> sceneList = it.value();
            for (int i = 0; i < sceneList.size(); ++i) {
                stuSceneInfo tempScene = sceneList[i];
                QTreeWidgetItem *sceneItem = new QTreeWidgetItem(rootItem,QStringList(QString(tempScene.name)));
            }
        }else {
            QList<stuSceneInfo> sceneList = it.value();
            for (int i = 0; i < sceneList.size(); ++i) {
                stuSceneInfo tempScene = sceneList[i];
                QTreeWidgetItem *sceneItem = new QTreeWidgetItem(QStringList(QString(tempScene.name)));
                widget->addTopLevelItem(sceneItem);
            }
        }
    }
}

void Dialog::deleteAllTreeItem()
{
    ui->treeWidget->clear();
    ui->treeWidget_2->clear();
    ui->treeWidget_3->clear();
    ui->treeWidget_4->clear();
}

QByteArray Dialog::readJsonFile()
{
    QByteArray byteArray;
    QString strPath = QCoreApplication::applicationDirPath() + "/data.json";
    QFile file(strPath);
    if (file.open(QIODevice::ReadOnly)) {
        byteArray = file.readAll();
    }else {
        qDebug()<<QStringLiteral("文件打开失败！");
        byteArray = "";
    }
    return byteArray;
}

void Dialog::parseJson(QByteArray &byteArray)
{
    QJsonParseError parseError;
    QJsonDocument doc = QJsonDocument::fromJson(byteArray,&parseError);
    if (!doc.isNull() && parseError.error == QJsonParseError::NoError) {
        QJsonObject rootObject = doc.object();
        if (rootObject.value("result").isArray()) {
            QJsonArray resultArray = rootObject.value("result").toArray();
            for (int i = 0; i < resultArray.size(); ++i) {
                QJsonObject sidObject = resultArray[i].toObject();
                stuGroupScene tempSidGroup;
                mapGroupScene tempGroupMap;
                int sid = sidObject.value("sid").toInt();
                if (sidObject.value("scene").isArray()) {
                    QJsonArray sceneArray = sidObject.value("scene").toArray();
                    for (int j = 0; j < sceneArray.size(); ++j) {
                        QJsonObject sceneObject = sceneArray[j].toObject();
                        QString group = sceneObject.value("group").toString();
                        stuSceneInfo tempScene;
                        tempScene.id = sceneObject.value("id").toString();
                        tempScene.name = sceneObject.value("name").toString();
                        //这段可以简化思路，直接判断map中有没有相应的键，有则改值，无则添加
                        #if 1
                        QMap<QString,QList<stuSceneInfo>>::iterator it = tempGroupMap.find(group);
                        if (it != tempGroupMap.end()) {
                            QList<stuSceneInfo> &tempSceneList = it.value();
                            tempSceneList.append(tempScene);
//                                tempGroupMap.insert(group,tempSceneList);//这步可以不要，虽然要上也没有什么事
                        }else {
                            QList<stuSceneInfo> tempSceneList;
                            tempSceneList.append(tempScene);
                            tempGroupMap.insert(group,tempSceneList);
                        }
                        #endif
#if 0
                        if (tempGroupMap.size() == 0) {
                            QList<stuSceneInfo> tempSceneList;
                            tempSceneList.append(tempScene);
                            tempGroupMap.insert(group,tempSceneList);
                        }else {
                            QMap<QString,QList<stuSceneInfo>>::iterator it = tempGroupMap.find(group);
                            if (it != tempGroupMap.end()) {
                                QList<stuSceneInfo> &tempSceneList = it.value();
                                tempSceneList.append(tempScene);
//                                tempGroupMap.insert(group,tempSceneList);//这步可以不要，虽然要上也没有什么事
                            }else {
                                QList<stuSceneInfo> tempSceneList;
                                tempSceneList.append(tempScene);
                                tempGroupMap.insert(group,tempSceneList);
                            }
                        }
                        #endif
                    }
                }
                tempSidGroup.sid = sid;
                tempSidGroup.group = tempGroupMap;
                m_sceneInfo.insert(sid,tempSidGroup);
            }
        }
    }
}

void Dialog::onCurrentIndexWidget(int index)
{
    ui->stackedWidget->setCurrentIndex(index);
}

void Dialog::on_updateBtn_clicked()
{
    QByteArray byteArray = readJsonFile();
    parseJson(byteArray);
    deleteAllTreeItem();
    initTreeWidget();
}

dialog.ui
ui文件中的结构

上述的ui文件中的结构有一部分折叠了，读者可自行研究。以上内容仅供学习时参考。