QT实现一个简易文本编辑器

setFixedSize(640,480);//设置窗口界面大小

    //菜单栏

    newaction1 = new QAction(QIcon("newfile.png"),"新建",this);//action的图标，名字，父类

    newaction1->setShortcut(QKeySequence("Ctrl+N"));//设置快捷键

    newaction2 = new QAction(QIcon("openfile.png"),"打开",this);

    newaction2->setShortcut(QKeySequence("Ctrl+O"));

    newaction3 = new QAction(QIcon("savefile.png"),"保存",this);

    newaction3->setShortcut(QKeySequence("Ctrl+S"));

    newaction4 = new QAction(QIcon("closefile.png"),"关闭",this);

    newaction4->setShortcut(QKeySequence("Ctrl+Q"));

    newaction5 = new QAction(QIcon("osave.png"),"另存为",this);

    newaction5->setShortcut(QKeySequence("Ctrl+E"));

    menu1 = menuBar()->addMenu("文件");//新建一个文件菜单

    menu1->addAction(newaction1);

    menu1->addAction(newaction2);

    menu1->addAction(newaction3);

    menu1->addAction(newaction4);

    menu1->addAction(newaction5);

    newaction6 = new QAction(QIcon("font.png"),"字体",this);

    newaction7 = new QAction(QIcon("color.png"),"字体颜色",this);

    menu2 = menuBar()->addMenu("设置");

    menu2->addAction(newaction6);

    menu2->addAction(newaction7);

//工具栏

    tob1 = addToolBar("新建");//里面添加任意字符串

    tob1->addAction(newaction1);

    tob2 = addToolBar("打开");

    tob2->addAction(newaction2);

    tob3 = addToolBar("保存");

    tob3->addAction(newaction5);

    tob5 = addToolBar("另存为");

    tob5->addAction(newaction9);

    tob4 = addToolBar("关闭");

    tob4->addAction(newaction6);

    tob6 = addToolBar("字体");

    tob6->addAction(newaction7);

    tob7 = addToolBar("字体颜色");

    tob7->addAction(newaction8);

//文本编辑框

    tedt = new QTextEdit(this);

    this->setCentralWidget(tedt);//把文本编辑框添加到中间

    tedt->setEnabled(false);//文本编辑使能:关闭

    //状态栏

   // statusBar()->showMessage("状态");

    lab = new QLabel("状态",this);

    lab->setText("状态");

    stb = statusBar();

    stb->addWidget(lab);

    connect(newaction1,SIGNAL(triggered()),this,SLOT(newfile()));

    connect(newaction2,SIGNAL(triggered()),this,SLOT(openfile()));

    connect(newaction3,SIGNAL(triggered()),this,SLOT(savefile()));

    connect(newaction4,SIGNAL(triggered()),this,SLOT(closefile()));

    connect(newaction6,SIGNAL(triggered()),this,SLOT(font()));

    connect(newaction7,SIGNAL(triggered()),this,SLOT(fontcolor()));

    connect(newaction5,SIGNAL(triggered()),this,SLOT(osavefile()));

void MainWindow:: newfile()

{

     tedt->setEnabled(true); //文本编辑使能：开

}

void MainWindow:: openfile()

{

    myfilename = QFileDialog::getOpenFileNames(this,"文件",".","Text files (*.txt);;XML files (*.xml)");//打开当前目录中的文件

    QFile file(myfilename[0]);

    if (!file.open(QIODevice::ReadWrite))

    {

        statusBar()->showMessage("打开失败");

        return ;

    }

    statusBar()->showMessage("打开成功");

    tedt->setText(file.readAll());//把文件中的内容显示在文本框

    tedt->setEnabled(true); //文本编辑使能：开

    file.close();

}

void MainWindow:: savefile()

{

    QFile file1(myfilename[0]);

    if (!file1.open(QIODevice::ReadWrite))

    {

        statusBar()->showMessage("保存失败");

        return ;

    }

    if(!file1.write(tedt->toPlainText().toStdString().c_str()))

    {

        statusBar()->showMessage("保存失败");

        return ;

    }

    statusBar()->showMessage("保存成功");

    file1.close();

}

void MainWindow:: osavefile()

{

    myfile = QFileDialog::getSaveFileName();

    QFile file(myfile);

    if (! file.open(QIODevice::ReadWrite)){

        statusBar()->showMessage("文件打开失败");

        return ;

    }

    if(!file.write(tedt->toPlainText().toStdString().c_str()))

    {

        statusBar()->showMessage("另存失败");

        return ;

    }

    statusBar()->showMessage("另存成功");

    file.close();

}

void MainWindow:: closefile()

{

    tedt->setText("");

    tedt->setEnabled(false); //文本编辑使能：关

}

void MainWindow:: font()

{

    bool ok;

    QFont myfont = QFontDialog::getFont(&ok,this);

    if(ok)

    {

        tedt->setFont(myfont);

    }

}

void MainWindow:: fontcolor()

{

    QColor mycolor = QColorDialog::getColor();

    tedt->setTextColor(mycolor);

}

MainWindow::~MainWindow()

{

}