notepad.cpp Example File
tutorials/notepad/notepad.cpp
#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);
#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::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 (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()
{
#if QT_CONFIG(clipboard)
ui->textEdit->copy();
#endif
}
void Notepad::on_actionCut_triggered()
{
#if QT_CONFIG(clipboard)
ui->textEdit->cut();
#endif
}
void Notepad::on_actionPaste_triggered()
{
#if QT_CONFIG(clipboard)
ui->textEdit->paste();
#endif
}
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"));
}