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()
{
}

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