mainwindow.cpp Example File

tools/codecs/mainwindow.cpp
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#include <QtWidgets> #include "mainwindow.h" #include "encodingdialog.h" #include "previewform.h" MainWindow::MainWindow() { textEdit = new QPlainTextEdit; textEdit->setLineWrapMode(QPlainTextEdit::NoWrap); setCentralWidget(textEdit); findCodecs(); previewForm = new PreviewForm(this); previewForm->setCodecList(codecs); createMenus(); setWindowTitle(tr("Codecs")); const QRect screenGeometry = QApplication::desktop()->screenGeometry(this); resize(screenGeometry.width() / 2, screenGeometry.height() * 2 / 3); } void MainWindow::open() { const QString fileName = QFileDialog::getOpenFileName(this); if (fileName.isEmpty()) return; QFile file(fileName); if (!file.open(QFile::ReadOnly)) { QMessageBox::warning(this, tr("Codecs"), tr("Cannot read file %1:\n%2") .arg(QDir::toNativeSeparators(fileName), file.errorString())); return; } const QByteArray data = file.readAll(); previewForm->setWindowTitle(tr("Choose Encoding for %1").arg(QFileInfo(fileName).fileName())); previewForm->setEncodedData(data); if (previewForm->exec()) textEdit->setPlainText(previewForm->decodedString()); } void MainWindow::save() { const QAction *action = qobject_cast<const QAction *>(sender()); const QByteArray codecName = action->data().toByteArray(); const QString title = tr("Save As (%1)").arg(QLatin1String(codecName)); QString fileName = QFileDialog::getSaveFileName(this, title); if (fileName.isEmpty()) return; QFile file(fileName); if (!file.open(QFile::WriteOnly | QFile::Text)) { QMessageBox::warning(this, tr("Codecs"), tr("Cannot write file %1:\n%2") .arg(QDir::toNativeSeparators(fileName), file.errorString())); return; } QTextStream out(&file); out.setCodec(codecName.constData()); out << textEdit->toPlainText(); } void MainWindow::about() { QMessageBox::about(this, tr("About Codecs"), tr("The <b>Codecs</b> example demonstrates how to read and write " "files using various encodings.")); } void MainWindow::aboutToShowSaveAsMenu() { QString currentText = textEdit->toPlainText(); foreach (QAction *action, saveAsActs) { QByteArray codecName = action->data().toByteArray(); QTextCodec *codec = QTextCodec::codecForName(codecName); action->setVisible(codec && codec->canEncode(currentText)); } } void MainWindow::findCodecs() { QMap<QString, QTextCodec *> codecMap; QRegularExpression iso8859RegExp("^ISO[- ]8859-([0-9]+).*$"); QRegularExpressionMatch match; foreach (int mib, QTextCodec::availableMibs()) { QTextCodec *codec = QTextCodec::codecForMib(mib); QString sortKey = codec->name().toUpper(); int rank; if (sortKey.startsWith(QLatin1String("UTF-8"))) { rank = 1; } else if (sortKey.startsWith(QLatin1String("UTF-16"))) { rank = 2; } else if ((match = iso8859RegExp.match(sortKey)).hasMatch()) { if (match.captured(1).size() == 1) rank = 3; else rank = 4; } else { rank = 5; } sortKey.prepend(QLatin1Char('0' + rank)); codecMap.insert(sortKey, codec); } codecs = codecMap.values(); } void MainWindow::createMenus() { QMenu *fileMenu = menuBar()->addMenu(tr("&File")); QAction *openAct = fileMenu->addAction(tr("&Open..."), this, &MainWindow::open); openAct->setShortcuts(QKeySequence::Open); QMenu *saveAsMenu = fileMenu->addMenu(tr("&Save As")); connect(saveAsMenu, &QMenu::aboutToShow, this, &MainWindow::aboutToShowSaveAsMenu); foreach (const QTextCodec *codec, codecs) { const QByteArray name = codec->name(); QAction *action = saveAsMenu->addAction(tr("%1...").arg(QLatin1String(name))); action->setData(QVariant(name)); connect(action, &QAction::triggered, this, &MainWindow::save); saveAsActs.append(action); } fileMenu->addSeparator(); QAction *exitAct = fileMenu->addAction(tr("E&xit"), this, &QWidget::close); exitAct->setShortcuts(QKeySequence::Quit); auto toolMenu = menuBar()->addMenu(tr("&Tools")); auto encodingAction = toolMenu->addAction(tr("Encodings"), this, &MainWindow::encodingDialog); encodingAction->setShortcut(Qt::CTRL + Qt::Key_E); encodingAction->setToolTip(tr("Shows a dialog allowing to convert to common encoding in programming languages.")); menuBar()->addSeparator(); QMenu *helpMenu = menuBar()->addMenu(tr("&Help")); helpMenu->addAction(tr("&About"), this, &MainWindow::about); helpMenu->addAction(tr("About &Qt"), qApp, &QApplication::aboutQt); } void MainWindow::encodingDialog() { if (!m_encodingDialog) { m_encodingDialog = new EncodingDialog(this); const QRect screenGeometry = QApplication::desktop()->screenGeometry(this); m_encodingDialog->setMinimumWidth(screenGeometry.width() / 4); } m_encodingDialog->show(); m_encodingDialog->raise(); }