QT实现文本编辑器

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include "QMainWindow"
#include "qtextedit.h"

class MainWindow : public QMainWindow
{
Q_OBJECT
public:
MainWindow(QWidget * parent = 0);
~MainWindow();

private:
void openFile();
void saveFile();
QAction * openAction;
QAction * saveAction;
QTextEdit * textEdit;
};
#endif

#include "QAction"
#include "QMenuBar"
#include "QMessageBox"
#include "QStatusBar"
#include "QToolBar"
#include "qfiledialog.h"
#include "qtextstream.h"
#include "qmessagebox.h"

#include "mainwindow.h"

MainWindow::MainWindow(QWidget * parent):QMainWindow(parent)
{
setWindowTitle(tr("Main Window"));

openAction = new QAction(QIcon(":/image/test"),tr("&Open"),this);
openAction->setShortcuts(QKeySequence::Open);//设置快捷键
openAction->setStatusTip(tr("Open an exist file"));

saveAction = new QAction(QIcon(":/image/test"),tr("&save"),this);
saveAction->setShortcut(QKeySequence::Save);
saveAction->setStatusTip(tr("Save a new file"));

QMenu * file = menuBar()->addMenu(tr("&File"));
file->addAction(openAction);
file->addAction(saveAction);

QToolBar * toolBar = addToolBar(tr("&File"));
toolBar->addAction(openAction);
toolBar->addAction(saveAction);

textEdit = new QTextEdit(this);
setCentralWidget(textEdit);

connect(openAction,&QAction::triggered,this,&MainWindow::openFile);
connect(saveAction,&QAction::triggered,this,&MainWindow::saveFile);
}

MainWindow::~MainWindow()
{

}

void MainWindow::openFile()
{
QString path = QFileDialog::getOpenFileName(this,tr("Open File"),".",tr("Text Files(*.txt)"));

if(!path.isEmpty())
{
QFile file(path);
if(!file.open(QIODevice::ReadOnly|QIODevice::Text))//以只读方式和文本方式打开这个文件
{
QMessageBox::warning(this,tr("Read File"),tr("can't open file"));
return;
}
QTextStream in(&file);
textEdit->setText(in.readAll());
file.close();
}
else
{
QMessageBox::warning(this,tr("Path"),tr("you didn't select anything"));
}
}

void MainWindow::saveFile()
{
QString path = QFileDialog::getSaveFileName(this,tr("Save File"),".",tr("Text File(*.txt)"));

if(!path.isEmpty())
{
QFile file(path);
if(!file.open(QIODevice::WriteOnly|QIODevice::Text))//已只写方式和文本方式打开这个文件
{
QMessageBox::warning(this,tr("Save File"),tr("can't save file"));
return;
}
QTextStream out(&file);
out<<textEdit->toPlainText();
file.close();
}
else
{
QMessageBox::warning(this,tr("Path"),tr("you didn't select anything"));
}
}

#include "texteditor.h"
#include <QtWidgets/QApplication>
#include "mainwindow.h"

int main(int argc, char *argv[])
{
QApplication a(argc, argv);
MainWindow win;
win.show();
return a.exec();
}