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| ** This file is part of the examples of the Qt Toolkit. |
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| |
| #include "mainwindow.h" |
| #include "encodingdialog.h" |
| #include "previewform.h" |
| |
| #include <QAction> |
| #include <QApplication> |
| #include <QFileDialog> |
| #include <QMenuBar> |
| #include <QMessageBox> |
| #include <QPlainTextEdit> |
| #include <QRegularExpression> |
| #include <QScreen> |
| #include <QTextCodec> |
| #include <QTextStream> |
| |
| 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 = screen()->geometry(); |
| 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() |
| { |
| const QString currentText = textEdit->toPlainText(); |
| for (QAction *action : qAsConst(saveAsActs)) { |
| const QByteArray codecName = action->data().toByteArray(); |
| const 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; |
| |
| const QList<int> mibs = QTextCodec::availableMibs(); |
| for (int mib : mibs) { |
| QTextCodec *codec = QTextCodec::codecForMib(mib); |
| |
| QString sortKey = codec->name().toUpper(); |
| char 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.capturedRef(1).size() == 1) |
| rank = 3; |
| else |
| rank = 4; |
| } else { |
| rank = 5; |
| } |
| sortKey.prepend(QLatin1Char('0' + rank)); |
| |
| codecMap.insert(sortKey, codec); |
| } |
| for (const auto &codec : qAsConst(codecMap)) |
| codecs += codec; |
| } |
| |
| 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); |
| for (const QTextCodec *codec : qAsConst(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 = screen()->geometry(); |
| m_encodingDialog->setMinimumWidth(screenGeometry.width() / 4); |
| } |
| m_encodingDialog->show(); |
| m_encodingDialog->raise(); |
| |
| } |