mainwindow.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent) :
      QMainWindow(parent),
      ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    this->setCentralWidget(ui->textEdit);
}

MainWindow::~MainWindow()
{
    delete ui;
}


void MainWindow::on_actionNew_triggered()
{
    current_file.clear();
    ui->textEdit->setText(QString());
}

void MainWindow::on_actionOpen_triggered()
{
    QString filename = QFileDialog::getOpenFileName(this, "Open the file");
    if (!filename.isEmpty() && !filename.isNull())
    {
        QFile file(filename);
        current_file = filename;
        if (!file.open(QIODevice::ReadOnly | QFile::Text))
        {
            QMessageBox::warning(this, "Warning", "Cannot open file: " + file.errorString());
            return;
        }
        setWindowTitle("Notepad - " + filename);
        QTextStream in(&file);
        QString text = in.readAll();
        ui->textEdit->setText(text);
        file.close();
    }
}

void MainWindow::on_actionSave_triggered()
{
    QString filename = QFileDialog::getSaveFileName(this, "Save as");
    if (!filename.isEmpty() && !filename.isNull())
    {
        QFile file(filename);
        if (!file.open(QFile::WriteOnly | QFile::Text))
        {
            QMessageBox::warning(this, "Warning", "Cannot save file: " + file.errorString());
            return;
        }
        current_file = filename;
        setWindowTitle(filename);
        QTextStream out(&file);
        QString text = ui->textEdit->toPlainText();
        out << text;
        file.close();
    }
}

void MainWindow::on_actionPrint_triggered()
{
    QPrinter printer;
    printer.setPrinterName("Printer Name");
    QPrintDialog pDialog(&printer, this);
    if (pDialog.exec() == QDialog::Rejected)
    {
        //QMessageBox::warning(this, "Warning", "Cannot access printer");
        return;
    }
    ui->textEdit->print(&printer);
}

void MainWindow::on_actionExit_triggered()
{
    QApplication::quit();
}


void MainWindow::on_actionCopy_triggered()
{
    ui->textEdit->copy();
}

void MainWindow::on_actionPaste_triggered()
{
    ui->textEdit->paste();
}

void MainWindow::on_actionCut_triggered()
{
    ui->textEdit->cut();
}

void MainWindow::on_actionUndo_triggered()
{
    ui->textEdit->undo();
}

void MainWindow::on_actionRedo_triggered()
{
    ui->textEdit->redo();
}