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++ // Copyright (C) 2016 The Qt Company Ltd.
++ // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
++
++ #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 <QTextStream>
++
++ #include <QtCore5Compat/qtextcodec.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 = 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;
++ }
++
++ auto codec = QTextCodec::codecForName(codecName.constData());
++ QByteArray text = codec->fromUnicode(textEdit->toPlainText());
++ file.write(text);
++ }
++
++ 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 : std::as_const(saveAsActs)) {
++ const QByteArray codecName = action->data().toByteArray();
++ const auto 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) {
++ auto 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.capturedView(1).size() == 1)
++ rank = 3;
++ else
++ rank = 4;
++ } else {
++ rank = 5;
++ }
++ sortKey.prepend(QLatin1Char('0' + rank));
++
++ codecMap.insert(sortKey, codec);
++ }
++ for (const auto &codec : std::as_const(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 auto codec : std::as_const(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();
++
++ }