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# languagechooser.cpp Example File
tools/i18n/languagechooser.cpp

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        ** This file is part of the documentation of the Qt Toolkit.
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        #include <QtGui>

        #include "languagechooser.h"
        #include "mainwindow.h"

        #ifdef Q_WS_MAC
        extern void qt_mac_set_menubar_merge(bool merge);
        #endif

        LanguageChooser::LanguageChooser(QWidget *parent)
            : QDialog(parent, Qt::WindowStaysOnTopHint)
        {
            groupBox = new QGroupBox("Languages");

            QGridLayout *groupBoxLayout = new QGridLayout;

            QStringList qmFiles = findQmFiles();
            for (int i = 0; i < qmFiles.size(); ++i) {
                QCheckBox *checkBox = new QCheckBox(languageName(qmFiles[i]));
                qmFileForCheckBoxMap.insert(checkBox, qmFiles[i]);
                connect(checkBox, SIGNAL(toggled(bool)), this, SLOT(checkBoxToggled()));
                groupBoxLayout->addWidget(checkBox, i / 2, i % 2);
            }
            groupBox->setLayout(groupBoxLayout);

            showAllButton = new QPushButton("Show All");
            hideAllButton = new QPushButton("Hide All");
            closeButton = new QPushButton("Close");
            closeButton->setDefault(true);

            connect(showAllButton, SIGNAL(clicked()), this, SLOT(showAll()));
            connect(hideAllButton, SIGNAL(clicked()), this, SLOT(hideAll()));
            connect(closeButton, SIGNAL(clicked()), this, SLOT(close()));

            QHBoxLayout *buttonLayout = new QHBoxLayout;
            buttonLayout->addStretch(1);
            buttonLayout->addWidget(showAllButton);
            buttonLayout->addWidget(hideAllButton);
            buttonLayout->addWidget(closeButton);

            QVBoxLayout *mainLayout = new QVBoxLayout;
            mainLayout->addWidget(groupBox);
            mainLayout->addLayout(buttonLayout);
            setLayout(mainLayout);

        #ifdef Q_WS_MAC
            qt_mac_set_menubar_merge(false);
        #endif

            setWindowTitle("I18N");
        }

        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 QWidget::eventFilter(object, event);
        }

        void LanguageChooser::closeEvent(QCloseEvent * /* event */)
        {
            qApp->quit();
        }

        void LanguageChooser::checkBoxToggled()
        {
            QCheckBox *checkBox = qobject_cast<QCheckBox *>(sender());
            MainWindow *window = mainWindowForCheckBoxMap[checkBox];
            if (!window) {
                QTranslator translator;
                translator.load(qmFileForCheckBoxMap[checkBox]);
                qApp->installTranslator(&translator);

                window = new MainWindow;
                window->setPalette(colorForLanguage(checkBox->text()));

                window->installEventFilter(this);
                mainWindowForCheckBoxMap.insert(checkBox, window);
            }
            window->setVisible(checkBox->isChecked());
        }

        void LanguageChooser::showAll()
        {
            foreach (QCheckBox *checkBox, qmFileForCheckBoxMap.keys())
                checkBox->setChecked(true);
        }

        void LanguageChooser::hideAll()
        {
            foreach (QCheckBox *checkBox, qmFileForCheckBoxMap.keys())
                checkBox->setChecked(false);
        }

        QStringList LanguageChooser::findQmFiles()
        {
            QDir dir(":/translations");
            QStringList fileNames = dir.entryList(QStringList("*.qm"), QDir::Files,
                                                  QDir::Name);
            QMutableStringListIterator i(fileNames);
            while (i.hasNext()) {
                i.next();
                i.setValue(dir.filePath(i.value()));
            }
            return fileNames;
        }

        QString LanguageChooser::languageName(const QString &qmFile)
        {
            QTranslator translator;
            translator.load(qmFile);

            return translator.translate("MainWindow", "English");
        }

        QColor LanguageChooser::colorForLanguage(const QString &language)
        {
            uint 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);
        }