notepad.cpp Example File

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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"));

  }