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 <QApplication>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 <QDialog>
#include <QList>
#include <QMap>
#include <QTreeWidget>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_NAMESPACEclass Dialog : public QDialog
{Q_OBJECTpublic: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 <QFile>
#include <QJsonArray>
#include <QJsonDocument>
#include <QJsonObject>
#include <QJsonParseError>
#include <QTreeWidgetItem>
#include <QDebug>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 1QMap<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 0if (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。

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qt中创键树形控件QTreeWidget与QStackWidget相绑定

引言

效果

示例

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