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()
{
}