Qt菜单项切换主界面

下面是代码截图

mainwindow.h

#ifndef MAINWINDOW_H #define MAINWINDOW_H #include <QMainWindow> QT_BEGIN_NAMESPACE namespace Ui { class MainWindow; } QT_END_NAMESPACE class file1; class file2; class edit01; class edit02; class gjxm; class MainWindow : public QMainWindow { Q_OBJECT public: MainWindow(QWidget *parent = nullptr); ~MainWindow(); private slots: void on_pushButton_clicked(); void on_actionshouye_triggered(); //菜单项file1 void on_actionsecond_triggered(); //菜单项file2 void on_actionedit01_triggered(); //编辑项edit01 void on_actionedit02_triggered(); //编辑项edit02 void on_actionGjXm_triggered(); //构建-构建项目 private: Ui::MainWindow *ui; file1* file1Widget; file2* file2Widget; edit01* edit1Widget; edit02* edit2Widget; gjxm* gjXmWidget; QWidget* currentWidget; void exchangedWidget(QWidget* pWidget); }; #endif // MAINWINDOW_H

mainwindow.cpp

#include "mainwindow.h" #include "ui_mainwindow.h" #include "qdebug.h" #include "file1.h" #include "file2.h" #include "edit01.h" #include "edit02.h" #include "gjxm.h" MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent) , ui(new Ui::MainWindow) ,file1Widget(NULL) ,file2Widget(NULL) ,edit1Widget(NULL) ,edit2Widget(NULL) ,gjXmWidget(NULL) ,currentWidget(NULL) { ui->setupUi(this); } //切换功能列表界面 void MainWindow::exchangedWidget(QWidget* pWidget) { if (!pWidget || !ui->horizontalLayout) { qWarning("切换失败：新画面为空或布局无效！"); return; } // 1. 移除并释放上一个画面 if (currentWidget) { // 关键：用 removeWidget 直接解除布局与控件的关联（比 removeItem 安全） ui->horizontalLayout->removeWidget(currentWidget); currentWidget->hide(); // 先隐藏，避免视觉闪烁 } // 2. 添加新画面并显示 currentWidget = pWidget; ui->horizontalLayout->addWidget(currentWidget); // 布局自动管理控件大小 currentWidget->show(); // addWidget 可能默认隐藏，显式调用更稳妥 } void MainWindow::on_actionshouye_triggered(){ //菜单项file1 if (file1Widget == NULL) { file1Widget = new file1(this); } exchangedWidget(file1Widget); } void MainWindow::on_actionsecond_triggered() { //菜单项file2 if (file2Widget == NULL) { file2Widget = new file2(this); } exchangedWidget(file2Widget); } void MainWindow::on_actionedit01_triggered() { //编辑项edit01 if (edit1Widget == NULL) { edit1Widget = new edit01(this); } exchangedWidget(edit1Widget); } void MainWindow::on_actionedit02_triggered() { //编辑项edit02 if (edit2Widget == NULL) { edit2Widget = new edit02(this); } exchangedWidget(edit2Widget); } void MainWindow::on_actionGjXm_triggered(){ if(gjXmWidget!=NULL){ delete gjXmWidget; gjXmWidget=NULL; } gjXmWidget=new gjxm(); QObject::connect(gjXmWidget, &gjxm::widgetCloseClicked, [=](){ delete gjXmWidget; gjXmWidget=NULL; }); gjXmWidget->show(); } MainWindow::~MainWindow() { delete ui; } void MainWindow::on_pushButton_clicked() { }

gjxm为点击某菜单弹框，需要重写关闭事件，对外发信号

gjxm.h

#ifndef GJXM_H #define GJXM_H #include <QWidget> namespace Ui { class gjxm; } class gjxm : public QWidget { Q_OBJECT public: explicit gjxm(QWidget *parent = nullptr); ~gjxm(); private: Ui::gjxm *ui; signals: void widgetCloseClicked(); //无参信号 protected: void closeEvent(QCloseEvent *event) override; // 重写关闭事件 }; #endif // GJXM_H

gjxm.cpp

#include "gjxm.h" #include "ui_gjxm.h" #include "QtDebug" gjxm::gjxm(QWidget *parent) : QWidget(parent), ui(new Ui::gjxm) { ui->setupUi(this); qDebug()<<"gjxm + + +"; } void gjxm::closeEvent(QCloseEvent *event) { emit widgetCloseClicked(); } gjxm::~gjxm() { qDebug()<<"gjxm ~ ~ ~"; delete ui; }