setupUi.md

ui->setupUi(this) 分析

• mywindow.h代码分析

    #ifndef MYWINDOW_H
    #define MYWINDOW_H
    
    #include <QMainWindow>
    
    QT_BEGIN_NAMESPACE
    namespace Ui { class MyWindow; } //声明了Ui下的MyWindow类
    QT_END_NAMESPACE
    
    class MyWindow : public QMainWindow
    {
        Q_OBJECT
    
    public:
        MyWindow(QWidget *parent = nullptr);
        ~MyWindow();
    
    private:
        Ui::MyWindow *ui; //定义私有成员变量ui
    };
    #endif // MYWINDOW_H
  

• mywindow.cpp代码分析

    #include "mywindow.h"
    #include "ui_mywindow.h" //引入了自动生成的ui文件的头
    
    MyWindow::MyWindow(QWidget *parent)
        : QMainWindow(parent)
        , ui(new Ui::MyWindow)
    {
        ui->setupUi(this); //把这个对象注入到ui里面
    }
    
    MyWindow::~MyWindow()
    {
        delete ui; //析构，释放ui
    }
  

• ui_mywindow.h 代码分析

    /********************************************************************************
    ** Form generated from reading UI file 'mywindow.ui'
    **
    ** Created by: Qt User Interface Compiler version 5.9.9
    **
    ** WARNING! All changes made in this file will be lost when recompiling UI file!
    ********************************************************************************/
    
    #ifndef UI_MYWINDOW_H
    #define UI_MYWINDOW_H
    
    #include <QtCore/QVariant>
    #include <QtWidgets/QAction>
    #include <QtWidgets/QApplication>
    #include <QtWidgets/QButtonGroup>
    #include <QtWidgets/QHeaderView>
    #include <QtWidgets/QMainWindow>
    #include <QtWidgets/QMenuBar>
    #include <QtWidgets/QStatusBar>
    #include <QtWidgets/QWidget>
    
    QT_BEGIN_NAMESPACE
    
    class Ui_MyWindow
    {
    public:
        QWidget *centralwidget;
        QMenuBar *menubar;
        QStatusBar *statusbar;
    
        void setupUi(QMainWindow *MyWindow) //定义了setupUi，对界面进行初始化，它按照我们在Qt设计器里设计的样子把窗体画出来，把我们在Qt设计器里面定义的信号和槽建立起来。
        {
            if (MyWindow->objectName().isEmpty())
                MyWindow->setObjectName(QStringLiteral("MyWindow"));
            MyWindow->resize(800, 600);
            centralwidget = new QWidget(MyWindow);
            centralwidget->setObjectName(QStringLiteral("centralwidget"));
            MyWindow->setCentralWidget(centralwidget);
            menubar = new QMenuBar(MyWindow);
            menubar->setObjectName(QStringLiteral("menubar"));
            MyWindow->setMenuBar(menubar);
            statusbar = new QStatusBar(MyWindow);
            statusbar->setObjectName(QStringLiteral("statusbar"));
            MyWindow->setStatusBar(statusbar);
    
            retranslateUi(MyWindow);
    
            QMetaObject::connectSlotsByName(MyWindow);
        } // setupUi
    
        void retranslateUi(QMainWindow *MyWindow)
        {
            MyWindow->setWindowTitle(QApplication::translate("MyWindow", "MyWindow", Q_NULLPTR));
        } // retranslateUi
    
    };
    
    namespace Ui {
        class MyWindow: public Ui_MyWindow {}; //声明MyWindow为Ui_MyWindow的子类
    } // namespace Ui
    
    QT_END_NAMESPACE
    
    #endif // UI_MYWINDOW_H