notepad.cpp Example File

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); connect(ui->actionNew, &QAction::triggered, this, &Notepad::newDocument); connect(ui->actionOpen, &QAction::triggered, this, &Notepad::open); connect(ui->actionSave, &QAction::triggered, this, &Notepad::save); connect(ui->actionSave_as, &QAction::triggered, this, &Notepad::saveAs); connect(ui->actionPrint, &QAction::triggered, this, &Notepad::print); connect(ui->actionExit, &QAction::triggered, this, &Notepad::exit); connect(ui->actionCopy, &QAction::triggered, this, &Notepad::copy); connect(ui->actionCut, &QAction::triggered, this, &Notepad::cut); connect(ui->actionPaste, &QAction::triggered, this, &Notepad::paste); connect(ui->actionUndo, &QAction::triggered, this, &Notepad::undo); connect(ui->actionRedo, &QAction::triggered, this, &Notepad::redo); connect(ui->actionFont, &QAction::triggered, this, &Notepad::selectFont); connect(ui->actionBold, &QAction::triggered, this, &Notepad::setFontBold); connect(ui->actionUnderline, &QAction::triggered, this, &Notepad::setFontUnderline); connect(ui->actionItalic, &QAction::triggered, this, &Notepad::setFontItalic); connect(ui->actionAbout, &QAction::triggered, this, &Notepad::about); // Disable menu actions for unavailable features #if !QT_CONFIG(printer) ui->actionPrint->setEnabled(false); #endif #if !QT_CONFIG(clipboard) ui->actionCut->setEnabled(false); ui->actionCopy->setEnabled(false); ui->actionPaste->setEnabled(false); #endif } Notepad::~Notepad() { delete ui; } void Notepad::newDocument() { currentFile.clear(); ui->textEdit->setText(QString()); } void Notepad::open() { 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::save() { 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::saveAs() { 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::print() { #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::exit() { QCoreApplication::quit(); } void Notepad::copy() { #if QT_CONFIG(clipboard) ui->textEdit->copy(); #endif } void Notepad::cut() { #if QT_CONFIG(clipboard) ui->textEdit->cut(); #endif } void Notepad::paste() { #if QT_CONFIG(clipboard) ui->textEdit->paste(); #endif } void Notepad::undo() { ui->textEdit->undo(); } void Notepad::redo() { ui->textEdit->redo(); } void Notepad::selectFont() { bool fontSelected; QFont font = QFontDialog::getFont(&fontSelected, this); if (fontSelected) ui->textEdit->setFont(font); } void Notepad::setFontUnderline(bool underline) { ui->textEdit->setFontUnderline(underline); } void Notepad::setFontItalic(bool italic) { ui->textEdit->setFontItalic(italic); } void Notepad::setFontBold(bool bold) { bold ? ui->textEdit->setFontWeight(QFont::Bold) : ui->textEdit->setFontWeight(QFont::Normal); } void Notepad::about() { QMessageBox::about(this, tr("About MDI"), tr("The <b>Notepad</b> example demonstrates how to code a basic " "text editor using QtWidgets")); }