qt5base-lts/examples/widgets/tutorials/notepad/notepad.cpp

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#include <QFile>
#include <QFileDialog>
#include <QTextStream>
#include <QMessageBox>
#if defined(QT_PRINTSUPPORT_LIB)
#include <QtPrintSupport/qtprintsupportglobal.h>
#if QT_CONFIG(printer)
#if QT_CONFIG(printdialog)
#include <QPrintDialog>
#endif // QT_CONFIG(printdialog)
#include <QPrinter>
#endif // QT_CONFIG(printer)
#endif // QT_PRINTSUPPORT_LIB
#include <QFont>
#include <QFontDialog>

#include "notepad.h"
#include "ui_notepad.h"

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

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

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

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

void Notepad::on_actionSave_triggered()
{
    QString fileName;
    // If we don't have a filename from before, get one.
    if (currentFile.isEmpty()) {
        fileName = QFileDialog::getSaveFileName(this, "Save");
        currentFile = fileName;
    } else {
        fileName = currentFile;
    }
    QFile file(fileName);
    if (!file.open(QIODevice::WriteOnly | QFile::Text)) {
        QMessageBox::warning(this, "Warning", "Cannot save file: " + file.errorString());
        return;
    }
    setWindowTitle(fileName);
    QTextStream out(&file);
    QString text = ui->textEdit->toPlainText();
    out << text;
    file.close();
}

void Notepad::on_actionSave_as_triggered()
{
    QString fileName = QFileDialog::getSaveFileName(this, "Save as");
    QFile file(fileName);

    if (!file.open(QFile::WriteOnly | QFile::Text)) {
        QMessageBox::warning(this, "Warning", "Cannot save file: " + file.errorString());
        return;
    }
    currentFile = fileName;
    setWindowTitle(fileName);
    QTextStream out(&file);
    QString text = ui->textEdit->toPlainText();
    out << text;
    file.close();
}

void Notepad::on_actionPrint_triggered()
{
#if QT_CONFIG(printer)
    QPrinter printDev;
#if QT_CONFIG(printdialog)
    QPrintDialog dialog(&printDev, this);
    if (dialog.exec() == QDialog::Rejected)
        return;
#endif // QT_CONFIG(printdialog)
    ui->textEdit->print(&printDev);
#endif // QT_CONFIG(printer)
}

void Notepad::on_actionExit_triggered()
{
    QCoreApplication::quit();
}

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

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

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

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

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

void Notepad::on_actionFont_triggered()
{
    bool fontSelected;
    QFont font = QFontDialog::getFont(&fontSelected, this);
    if (fontSelected)
        ui->textEdit->setFont(font);
}

void Notepad::on_actionUnderline_triggered()
{
    ui->textEdit->setFontUnderline(ui->actionUnderline->isChecked());
}

void Notepad::on_actionItalic_triggered()
{
    ui->textEdit->setFontItalic(ui->actionItalic->isChecked());
}

void Notepad::on_actionBold_triggered()
{
    ui->actionBold->isChecked() ? ui->textEdit->setFontWeight(QFont::Bold) :
                                  ui->textEdit->setFontWeight(QFont::Normal);
}

void Notepad::on_actionAbout_triggered()
{
   QMessageBox::about(this, tr("About MDI"),
                tr("The <b>Notepad</b> example demonstrates how to code a basic "
                   "text editor using QtWidgets"));

}