1 files changed, 141 insertions, 0 deletions
diff --git a/examples/linguist/i18n/languagechooser.cpp b/examples/linguist/i18n/languagechooser.cpp
new file mode 100644
index 000000000..a8558cb60
--- /dev/null
+++ b/examples/linguist/i18n/languagechooser.cpp
@@ -0,0 +1,141 @@
+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#include "languagechooser.h"
+#include "mainwindow.h"
+
+#include <QCoreApplication>
+#include <QCheckBox>
+#include <QDialogButtonBox>
+#include <QDir>
+#include <QGridLayout>
+#include <QGroupBox>
+#include <QPushButton>
+#include <QTranslator>
+
+#include <algorithm>
+
+LanguageChooser::LanguageChooser(QWidget *parent) : QDialog(parent, Qt::WindowStaysOnTopHint)
+{
+    groupBox = new QGroupBox("Languages");
+
+    QGridLayout *groupBoxLayout = new QGridLayout;
+
+    const QStringList qmFiles = findQmFiles();
+    const QStringList uiLanguages = QLocale::system().uiLanguages();
+    for (int i = 0; i < qmFiles.size(); ++i) {
+        const QString &qmFile = qmFiles.at(i);
+        QCheckBox *checkBox = new QCheckBox(languageName(qmFile));
+        qmFileForCheckBoxMap.insert(checkBox, qmFile);
+        connect(checkBox, &QCheckBox::toggled, this, &LanguageChooser::checkBoxToggled);
+        if (std::find_if(
+                    uiLanguages.begin(), uiLanguages.end(),
+                    [qmFile](const QString &lang) -> bool { return languageMatch(lang, qmFile); })
+            != uiLanguages.end())
+            checkBox->setCheckState(Qt::Checked);
+        groupBoxLayout->addWidget(checkBox, i / 2, i % 2);
+    }
+    groupBox->setLayout(groupBoxLayout);
+
+    buttonBox = new QDialogButtonBox;
+    showAllButton = buttonBox->addButton("Show All", QDialogButtonBox::ActionRole);
+    hideAllButton = buttonBox->addButton("Hide All", QDialogButtonBox::ActionRole);
+
+    connect(showAllButton, &QAbstractButton::clicked, this, &LanguageChooser::showAll);
+    connect(hideAllButton, &QAbstractButton::clicked, this, &LanguageChooser::hideAll);
+
+    QVBoxLayout *mainLayout = new QVBoxLayout;
+    mainLayout->addWidget(groupBox);
+    mainLayout->addWidget(buttonBox);
+    setLayout(mainLayout);
+
+    setWindowTitle("I18N");
+}
+
+bool LanguageChooser::languageMatch(QStringView lang, QStringView qmFile)
+{
+    // qmFile: i18n_xx.qm
+    const QStringView prefix{ u"i18n_" };
+    const int langTokenLength = 2; /*FIXME: is checking two chars enough?*/
+    return qmFile.mid(qmFile.indexOf(prefix) + prefix.length(), langTokenLength)
+            == lang.left(langTokenLength);
+}
+
+bool LanguageChooser::eventFilter(QObject *object, QEvent *event)
+{
+    if (event->type() == QEvent::Close) {
+        MainWindow *window = qobject_cast<MainWindow *>(object);
+        if (window) {
+            QCheckBox *checkBox = mainWindowForCheckBoxMap.key(window);
+            if (checkBox)
+                checkBox->setChecked(false);
+        }
+    }
+    return QDialog::eventFilter(object, event);
+}
+
+void LanguageChooser::closeEvent(QCloseEvent * /* event */)
+{
+    QCoreApplication::quit();
+}
+
+void LanguageChooser::checkBoxToggled()
+{
+    QCheckBox *checkBox = qobject_cast<QCheckBox *>(sender());
+    MainWindow *window = mainWindowForCheckBoxMap.value(checkBox);
+    if (!window) {
+        QTranslator translator;
+        const QString qmlFile = qmFileForCheckBoxMap.value(checkBox);
+        if (translator.load(qmlFile))
+            QCoreApplication::installTranslator(&translator);
+        else
+            qWarning("Unable to load %s", qPrintable(QDir::toNativeSeparators(qmlFile)));
+
+        window = new MainWindow;
+        window->setPalette(colorForLanguage(checkBox->text()));
+
+        window->installEventFilter(this);
+        mainWindowForCheckBoxMap.insert(checkBox, window);
+    }
+    window->setVisible(checkBox->isChecked());
+}
+
+void LanguageChooser::showAll()
+{
+    for (auto it = qmFileForCheckBoxMap.keyBegin(); it != qmFileForCheckBoxMap.keyEnd(); ++it)
+        (*it)->setChecked(true);
+}
+
+void LanguageChooser::hideAll()
+{
+    for (auto it = qmFileForCheckBoxMap.keyBegin(); it != qmFileForCheckBoxMap.keyEnd(); ++it)
+        (*it)->setChecked(false);
+}
+
+QStringList LanguageChooser::findQmFiles()
+{
+    QDir dir(":/i18n");
+    QStringList fileNames = dir.entryList(QStringList("*.qm"), QDir::Files, QDir::Name);
+    for (QString &fileName : fileNames)
+        fileName = dir.filePath(fileName);
+    return fileNames;
+}
+
+QString LanguageChooser::languageName(const QString &qmFile)
+{
+    QTranslator translator;
+    if (!translator.load(qmFile)) {
+        qWarning("Unable to load %s", qPrintable(QDir::toNativeSeparators(qmFile)));
+        return {};
+    }
+    return translator.translate("MainWindow", "English");
+}
+
+QColor LanguageChooser::colorForLanguage(const QString &language)
+{
+    size_t hashValue = qHash(language);
+    int red = 156 + (hashValue & 0x3F);
+    int green = 156 + ((hashValue >> 6) & 0x3F);
+    int blue = 156 + ((hashValue >> 12) & 0x3F);
+    return QColor(red, green, blue);
+}