1.

2. mainwindow.h

#ifndef MAINWINDOW_H

#define MAINWINDOW_H

#include <QMainWindow>

#include <QWorkspace>

#include <QMdiArea>

#include <QMdiSubWindow>

class QAction;

class QMenu;

class QToolBar;

class QTextEdit;

class MainWindow : public QMainWindow

{

    Q_OBJECT

public:

    MainWindow();

    void createMenus();

    void createActions();

    void createToolBars();

    void loadFile(QString fileName);

public slots:

    void slotNewFile();

    void slotOpenFile();

    void slotSaveFile();

    void slotCopy();

    void slotCut();

    void slotPaste();

    void slotAbout();

protected:

    //void closeEvent(QCloseEvent *);

private:

    QTextCodec *codec;

    QMenu *fileMenu;

    QMenu *editMenu;

    QMenu *aboutMenu;

    QToolBar *fileTool;

    QToolBar *editTool;

    QAction *fileOpenAction;

    QAction *fileNewAction;

    QAction *fileSaveAction;

    QAction *exitAction;

    QAction *copyAction;

    QAction *cutAction;

    QAction *pasteAction;

    QAction *aboutAction;

    QTextEdit * text;

    QWorkspace *workSpace;

};

#endif // MAINWINDOW_H

3. mainwindow.cpp

MainWindow构造函数中可加入 setAttribute(Qt::WA_DeleteOnClose);

多窗口时关闭窗口默认是隐藏，这样设置后为关闭，防止内存泄露。

#include "mainwindow.h"

#include <QtGui>

// 翋敦諳妗珋

MainWindow::MainWindow()

{

    setWindowTitle(tr("myMainWindow"));

    text = new QTextEdit(this);

    setCentralWidget(text);

/*    workSpace = new QWorkspace;

    setCentralWidget(workSpace);

    QMainWindow *window1 = new QMainWindow;

    window1->setWindowTitle("window1");

    QTextEdit *text1 = new QTextEdit;

    text1->setText("text1");

    window1->setCentralWidget(text1);

    workSpace->addWindow(window1);

*/

    createActions();

    createMenus();

    createToolBars();

}

void

MainWindow::createActions()

{

    // file open action

    fileOpenAction = new QAction(QIcon(":/images/open.png"),tr("Open"),this);	// 湖羲恅璃

    fileOpenAction->setShortcut(tr("Ctrl+O"));

    fileOpenAction->setStatusTip(tr("open a file"));

    connect(fileOpenAction,SIGNAL(triggered()),this,SLOT(slotOpenFile()));

    // file new action

    fileNewAction = new QAction(QIcon(":/images/new.png"),tr("New"),this);	// 陔膘恅璃

    fileNewAction->setShortcut(tr("Ctrl+N"));

    fileNewAction->setStatusTip(tr("new file"));

    connect(fileNewAction,SIGNAL(triggered()),this,SLOT(slotNewFile()));

    // save file action

    fileSaveAction = new QAction(QPixmap(":/images/save.png"),tr("Save"),this);	// 悵湔恅璃

    fileSaveAction->setShortcut(tr("Ctrl+S"));

    fileSaveAction->setStatusTip(tr("save file"));

    connect(fileSaveAction,SIGNAL(activated()),this,SLOT(slotSaveFile()));

    // exit action

    exitAction = new QAction(tr("Exit"), this);	// 豖堤

    exitAction->setShortcut(tr("Ctrl+Q"));

    exitAction->setStatusTip(tr("exit"));

    connect(exitAction, SIGNAL(triggered()), this, SLOT(close()));

    cutAction = new QAction(QIcon(":/images/cut.png"), tr("Cut"), this);		// 熟

    cutAction->setShortcut(tr("Ctrl+X"));

    cutAction->setStatusTip(tr("cut to clipboard"));

    connect(cutAction, SIGNAL(triggered()), text, SLOT(cut()));

    copyAction = new QAction(QIcon(":/images/copy.png"), tr("Copy"), this);		// 葩秶

    copyAction->setShortcut(tr("Ctrl+C"));

    copyAction->setStatusTip(tr("copy to clipboard"));

    connect(copyAction, SIGNAL(triggered()), text, SLOT(copy()));

    pasteAction = new QAction(QIcon(":/images/paste.png"), tr("Paste"), this);		// 梜泂

    pasteAction->setShortcut(tr("Ctrl+V"));

    pasteAction->setStatusTip(tr("paste clipboard to selection"));

    connect(pasteAction, SIGNAL(triggered()), text, SLOT(paste()));

    aboutAction = new QAction(tr("About"), this);		// 壽衾

    connect(aboutAction, SIGNAL(triggered()), this, SLOT(slotAbout()));

}

void

MainWindow::createMenus()

{

    fileMenu = menuBar()->addMenu(tr("File"));

    editMenu = menuBar()->addMenu(tr("Edit"));

    aboutMenu = menuBar()->addMenu(tr("Help"));

    fileMenu->addAction(fileNewAction);

    fileMenu->addAction(fileOpenAction);

    fileMenu->addAction(fileSaveAction);

    fileMenu->addAction(exitAction);

    editMenu->addAction(copyAction);

    editMenu->addAction(cutAction);

    editMenu->addAction(pasteAction);

    aboutMenu->addAction(aboutAction);

}

void

MainWindow::createToolBars()

{

    fileTool = addToolBar(tr("File"));

    fileTool->setMovable(false);

    editTool = addToolBar(tr("Edit"));

    fileTool->addAction(fileNewAction);

    fileTool->addAction(fileOpenAction);

    fileTool->addAction(fileSaveAction);

    editTool->addAction(copyAction);

    editTool->addAction(cutAction);

    editTool->addAction(pasteAction);

}

void MainWindow::slotNewFile()

{

    MainWindow *newWin = new MainWindow();

    newWin->show();

}

void MainWindow::loadFile(QString fileName)

{

    QFile file( fileName );

    if ( file.open (QIODevice::ReadOnly | QIODevice::Text))

    {

        QTextStream textStream( &file );

        while( !textStream.atEnd() )

        {

            text->append( textStream.readLine() );

        }

    }

}

void MainWindow::slotOpenFile()

{

    QString fileName = QFileDialog::getOpenFileName(this);

    if ( !fileName.isEmpty() )

    {

        if( text->document()->isEmpty() )

            loadFile(fileName);

        else

        {

            MainWindow *newWin = new MainWindow;

            newWin->show();

            newWin->loadFile(fileName);

        }

    }

}

void MainWindow::slotSaveFile()

{

}

void MainWindow::slotCopy()

{

}

void MainWindow::slotCut()

{

}

void MainWindow::slotPaste()

{

}

void MainWindow::slotAbout()

{

}