qt 5.15.2 主窗体菜单工具栏树控件功能

显示主窗体效果：

mainwindow.h文件内容：

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QFileDialog>
#include <QString>
#include <QMessageBox>

#include <QTreeView>
#include <QFileSystemModel>

#include <QDockWidget>
#include <QLabel>
#include <QPushButton>
#include <QTextEdit>
#include <QToolBar>
#include <QAction>
#include <QFile>
#include <QStandardItemModel>
#include <QResizeEvent>
#include <QDebug>
//

#include "scene.h"

using namespace Qt;

QT_BEGIN_NAMESPACE
namespace Ui {
class MainWindow;
}
QT_END_NAMESPACE

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    MainWindow(QWidget *parent = nullptr);
    ~MainWindow();
    //
    bool eventFilter(QObject *obj, QEvent *event);
    //void resizeEvent(QResizeEvent *event);


private slots:
    void openImageFile();     //定义卡槽函数
    void TreeDoubleClicked(const QModelIndex &index);
    void on_actionOpen_File_triggered();
    void init_3d();


private:
    Ui::MainWindow *ui;    
    //
    QString currentFile;
    QTreeView* treeView;
    QDockWidget *dockWidget;
    //
    QStandardItem* currentNode;
    QStandardItemModel* model;
    //
    Scene* scene;
    Qt3DExtras::Qt3DWindow* view;
    QWidget *sceneWidget;
};
#endif // MAINWINDOW_H

mainwindow.cpp文件内容：

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


#include <QFirstPersonCameraController>
#include <QSplitter>
#include <QVBoxLayout>



MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    //设置主界面主题颜色风格(黑灰背景色+白字)
    //this->setStyleSheet ("background-color: rgb(60,60,60);color: rgb(255,255,255);border-color:rgb(230,230,230);");

    //重置窗口
    //resize(600, 400);
    //最大化窗体
    this->setWindowState(Qt::WindowMaximized);

    //创建菜单栏 (只有一个菜单栏)
    QMenuBar *bar = this->menuBar();
    //将菜单栏放入窗口中
    this->setMenuBar(bar);
    //创建菜单项
    QMenu *menuBegin = bar->addMenu("开始");
    QMenu *menuEdit = bar->addMenu("操作");
    QMenu *menuDisplay = bar->addMenu("显示");
    QMenu *menuView = bar->addMenu("视图");
    //创建菜单项
    QAction *build_act = menuBegin->addAction("新建");//给菜单项下面再添加项目
    //添加分隔符
    menuBegin->addSeparator();

    //程序中菜单栏最多有一个
    //QICon *ico=QIcon(":/images/File");

    //添加菜单和工具栏按钮功能并与功能函数绑定
    QString filePath=qApp->applicationDirPath()+"/images/File.ico";
    QAction *act_open_image =menuBegin->addAction(QIcon(filePath),"打开图片文件");
    connect(act_open_image,&QAction::triggered,this,&MainWindow::openImageFile);

    //添加菜单和工具栏按钮功能并与功能函数绑定
    QString openDirPath=qApp->applicationDirPath()+"/images/Open.ico";
    QAction *act_open = menuBegin->addAction(QIcon(openDirPath),"打开文件夹");
    connect(act_open,&QAction::triggered,this,&MainWindow::openImageFile);


    QAction *act_init_3d = menuBegin->addAction(QIcon(openDirPath),"初始化3D");
    connect(act_init_3d,&QAction::triggered,this,&MainWindow::init_3d);


    //工具栏，可以有多个
    QToolBar * toolBar = new QToolBar(this);
    this->addToolBar(toolBar);  // 将工具栏添加
    this->addToolBar(Qt::TopToolBarArea,toolBar);     //出现在top
    //this->addToolBar(Qt::LeftToolBarArea, toolBar);//令其默认出现在左边
    //this->addToolBar(Qt::RightToolBarArea, toolBar);
    //设置允许的停靠范围
    toolBar->setAllowedAreas(Qt::TopToolBarArea);
    //toolBar->setAllowedAreas(Qt::LeftToolBarArea | Qt::RightToolBarArea);//不会让其停靠在上边，但会浮动
    //设置浮动
    toolBar->setFloatable(false);//禁止浮动
    //设置移动
    toolBar->setMovable(false);//禁止移动
    //工具栏可设置内容
    toolBar->addAction(build_act);//将新建菜单项添加进来，传入的是QAction指针
    toolBar->addSeparator();//添加分割线
    toolBar->addAction(act_open);        //将打开项目添加进来
    toolBar->addAction(act_open_image);  //打开
    toolBar->addAction(act_init_3d);     //初始化3d
    toolBar->addSeparator();
    toolBar->addAction("其他");//传入字符串
    //工具栏添加控件
    QPushButton *p = new QPushButton(this);
    p->setText("自定义的按钮");
    toolBar->addWidget(p);// 添加控件

    //
    //状态栏：最多一个
    QStatusBar * stBar = this->statusBar();
    //设置到窗口
    this->setStatusBar(stBar);
    //QLabel *leftMsg=new QLabel(this->currentFile,this);
    stBar->showMessage(this->currentFile);
    // 放入标签控件
    QLabel *label = new QLabel("提示信息", this);
    stBar->addWidget(label);//放到左侧
    //状态栏设置标签控件位置
    stBar->addPermanentWidget(label);//放到右侧

    //铆接部件（浮动窗口）,可以多个
    QDockWidget *dockWidget = new QDockWidget("功能树", this);
    //设置只能移动，不能关闭
    dockWidget->setFeatures(QDockWidget::NoDockWidgetFeatures | QDockWidget::DockWidgetMovable);
    this->addDockWidget(Qt::LeftDockWidgetArea, dockWidget);//将浮动窗口默认放到左边


    //设置后期停靠区域，只允许左右
    dockWidget->setAllowedAreas(Qt::LeftDockWidgetArea);
    dockWidget->setFixedWidth(300);
    //设置中心部件
    //QTextEdit *edit = new QTextEdit(this);
    //this->setCentralWidget(edit);

    //菜单栏：set只能一个, 工具栏add可以多个，状态栏set只能一个， 铆接部件add可以多个

    //树控件
    treeView=new QTreeView(dockWidget);
    //treeView->setFixedWidth(300);
    //treeView->setFixedHeight(600);
    // 隐藏标题头
    treeView->setHeaderHidden(true);
    // 禁用节点编辑
    treeView->setEditTriggers(QAbstractItemView::NoEditTriggers);
    //添加双击事件
    connect(treeView,&QTreeView::doubleClicked,this,&MainWindow::TreeDoubleClicked);

    dockWidget->setWidget(treeView);



    // 设置初始权重以控制初始大小分配
    //QSplitter splitter;
    //splitter.setStretchFactor(0, 1); // QDockWidget 子控件权重为 1
    //splitter.addWidget(dockWidget);
    //splitter.show();


    //QFileSystemModel* fileSystemModel=new QFileSystemModel;
    //fileSystemModel->setRootPath("/");
    //treeView->setModel(fileSystemModel);

    model = new QStandardItemModel(dockWidget);
    treeView->setModel(model);
    QStandardItem* item3d = new QStandardItem("三维模型");
    model->appendRow(item3d);
    //子节点
    QStandardItem* itemOpenShp = new QStandardItem("打开obj文件");
    item3d->appendRow(itemOpenShp);
    //
    QStandardItem* itemVec = new QStandardItem("矢量图层");
    model->appendRow(itemVec);
    //
    QStandardItem* itemImage = new QStandardItem("影像图层");
    model->appendRow(itemImage);
    //
    QStandardItem* itemMarker = new QStandardItem("标注信息");
    model->appendRow(itemMarker);
    //

    //scene  3d
    view = new Qt3DExtras::Qt3DWindow();
    sceneWidget = QWidget::createWindowContainer(view);
    scene = new Scene(view);
    view-> installEventFilter(this);

    // 添加布局管理   treeView的高宽与QVBoxLayout布局自动变化
    QWidget *centralWidget = new QWidget();
    //QVBoxLayout *layout = new QVBoxLayout(centralWidget);
    QHBoxLayout *layout = new QHBoxLayout(centralWidget);
    layout->addWidget(dockWidget);   //树控件
    layout->addWidget(sceneWidget);  //3d地图控件
    this->setCentralWidget(centralWidget);
    //
}

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

bool MainWindow::eventFilter(QObject *obj, QEvent *event)
{
    if (event->type() == QEvent::KeyPress){
        QKeyEvent *keyEvent = static_cast<QKeyEvent *>(event);
        scene->KeyControls(keyEvent);
    }
    return QObject::eventFilter(obj, event);
}

/*
void MainWindow::resizeEvent(QResizeEvent *event)
{
    treeView->setFixedWidth(dockWidget->width());
    treeView->setFixedHeight(dockWidget->height());
    //qDebug()<<"resize: "<<event->size();
    this->update();
}*/

//打开文件 menu/toolbar
void MainWindow::openImageFile()
{
    QString filename= QFileDialog::getOpenFileName(this,"Open file");
    QFile file(filename);
    currentFile = filename;
    if (!file.open(QIODevice::ReadOnly)) {
        QMessageBox::warning(this,"Warning", "Cannot open "+file.errorString());
    }
    setWindowTitle(filename);
    //添加3d file
    QUrl fUrl=QUrl("file://"+filename);
    Qt3DRender::QMesh *mesh = new Qt3DRender::QMesh();
    mesh->setSource(fUrl);

    Qt3DCore::QEntity *entity = new Qt3DCore::QEntity();
    entity->addComponent(mesh);

    Qt3DExtras::QFirstPersonCameraController *cam=new Qt3DExtras::QFirstPersonCameraController(entity);
    cam->setCamera(view->camera());

    view->setRootEntity(entity);

    //view->camera()->viewAll();



}

//打开文件 tree pad/open
void MainWindow::on_actionOpen_File_triggered()
{
    QString filename= QFileDialog::getOpenFileName(this,"Open file");
    QFile file(filename);
    currentFile = filename;
    if (!file.open(QIODevice::ReadOnly)) {
        QMessageBox::warning(this,"Warning", "Cannot open "+file.errorString());
    }
    setWindowTitle(filename);
    //
    Qt3DRender::QMesh *mesh = new Qt3DRender::QMesh();
    QUrl data =QUrl::fromLocalFile(filename);
    mesh->setSource(data);

    qDebug()<<"mesh status="<<mesh->status();

    //获取视图的大小
    //QSize screenSize = view->size();
    sceneWidget->setMinimumSize(QSize(10, 10));//最小
    sceneWidget->setMaximumSize(QSize(5000, 5000));//最大

    scene->NewScene(mesh);

    Qt3DExtras::QFirstPersonCameraController *cam=new Qt3DExtras::QFirstPersonCameraController(scene->rootEntity);
    cam->setCamera(view->camera());


}

void MainWindow::init_3d()
{
    scene->init3d();

    Qt3DExtras::QFirstPersonCameraController *cam=new Qt3DExtras::QFirstPersonCameraController(scene->rootEntity);
    cam->setCamera(view->camera());
}

void MainWindow::TreeDoubleClicked(const QModelIndex &index)
{
    // 获取当前选中节点索引
    QModelIndex currentIndex = treeView->currentIndex();
    if (currentIndex.isValid()) {
        // 执行相关操作，例如获取节点信息或执行其他操作
        this->currentNode = model->itemFromIndex(currentIndex);
        if(this->currentNode->text()=="打开obj文件")
        {
             this->on_actionOpen_File_triggered();
        }
        else
        {
            //qDebug() << "Current selected item text:" << currentItem->text();
            QMessageBox::information(this,"提示信息", this->currentNode->text());
        }
    } else {
        //qDebug() << "No item selected";
        QMessageBox::information(this,"提示信息", "未选中节点");
    }
}

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