QT实现按钮开关Form窗体的效果的示例代码

#include "mainwindow.h"
#include <QApplication>
int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;
    w.show();
    return a.exec();
}

#include "form.h"
#include "ui_form.h"
Form::Form(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Form)
{
    ui->setupUi(this);
    setWindowFlags(Qt::CustomizeWindowHint |
                   Qt::WindowMinimizeButtonHint |
                   Qt::WindowMaximizeButtonHint);   // 禁用Form窗体的关闭按钮
}
Form::~Form()
{
    delete ui;
}

#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
namespace Ui {
class MainWindow;
}
class MainWindow : public QMainWindow
{
    Q_OBJECT
public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();
    void closeEvent(QCloseEvent *); // 重写MainWindow的关闭事件
private slots:
    void on_pushButton_clicked();
private:
    Ui::MainWindow *ui;
};
#endif // MAINWINDOW_H

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include "form.h"
#include <QDebug>
static bool newWinFlag = false;
Form *configWindow = NULL;
MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    configWindow = new Form;
}
MainWindow::~MainWindow()
{
    delete ui;
}
void MainWindow::closeEvent(QCloseEvent *e)
{
    configWindow->close(); // 此处为了实现关闭MainWindow的同时也关闭Form窗体
}
void MainWindow::on_pushButton_clicked()
{
    qDebug() << newWinFlag;
    newWinFlag = !newWinFlag;
    if(newWinFlag == true)
    {
        configWindow->show();
        return;
    }
    else
    {
        configWindow->close();
        return;
    }
}

#ifndef FORM_H
#define FORM_H
#include <QWidget>
namespace Ui {
class Form;
}
class Form : public QWidget
{
    Q_OBJECT
public:
    explicit Form(QWidget *parent = 0);
    ~Form();
private:
    Ui::Form *ui;
};
#endif // FORM_H