Qt-多文档界面应用

mainwindow.h:

#ifndef MAINWINDOW_H

#define MAINWINDOW_H

#include 

#include

#include

#include

namespace Ui {

class MainWindow;

}

class MainWindow : public QMainWindow

{

    Q_OBJECT

public:

    explicit MainWindow(QWidget *parent = 0);

    ~MainWindow();

private:

    Ui::MainWindow *ui;

    QMdiArea * m_mdiArea;

private slots:

    void actNewWindow();

};

#endif // MAINWINDOW_H

mainwindow.cpp:

#include "mainwindow.h"

#include "ui_mainwindow.h"

#include

MainWindow::MainWindow(QWidget *parent) :

    QMainWindow(parent),

    ui(new Ui::MainWindow)

{

    ui->setupUi(this);

    m_mdiArea = new QMdiArea;

    this->setCentralWidget(m_mdiArea);

 connect(ui->actionNew,SIGNAL(triggered()),this,SLOT(actNewWindow()));

}

void MainWindow::actNewWindow()

{

    QLabel *label = new QLabel(tr("MDI SubWindow"));

    QMdiSubWindow *subwin = new QMdiSubWindow;

    subwin->setWidget(label);

    subwin->setAttribute(Qt::WA_DeleteOnClose);

 subwin->resize(180,100);

m_mdiArea->addSubWindow(subwin);

subwin->show();

}

MainWindow::~MainWindow()

{

    delete ui;

}