GUI: Save the language preferences

The language change only happens only upon restart. Issue #210
rakhimov · Oct 17, 2017 · 2b9d2c1 · 2b9d2c1
1 parent 531150f
commit 2b9d2c1
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Showing 3 changed files with 38 additions and 0 deletions.
diff --git a/gui/preferencesdialog.cpp b/gui/preferencesdialog.cpp
@@ -18,11 +18,20 @@
 #include "preferencesdialog.h"
 #include "ui_preferencesdialog.h"
 
+#include <string>
+
+#include <QMessageBox>
+
+#include <boost/range/algorithm.hpp>
+
+#include "guiassert.h"
 #include "overload.h"
 
 namespace scram {
 namespace gui {
 
+const char *const PreferencesDialog::m_languageToLocale[] = {"en", "ru_RU"};
+
 PreferencesDialog::PreferencesDialog(QSettings *preferences,
                                      QUndoStack *undoStack,
                                      QTimer *autoSaveTimer,
@@ -31,6 +40,27 @@ PreferencesDialog::PreferencesDialog(QSettings *preferences,
 {
     ui->setupUi(this);
 
+    GUI_ASSERT(std::distance(std::begin(m_languageToLocale),
+                             std::end(m_languageToLocale))
+                   == ui->languageBox->count(), );
+    auto it = boost::find(m_languageToLocale,
+                          preferences->value(QStringLiteral("language"))
+                              .toString()
+                              .toStdString());
+    auto it_end = std::end(m_languageToLocale);
+    if (it != it_end)
+        ui->languageBox->setCurrentIndex(std::distance(m_languageToLocale, it));
+    connect(ui->languageBox, OVERLOAD(QComboBox, currentIndexChanged, int),
+            preferences, [this, preferences](int index) {
+                QMessageBox::information(
+                    this, tr("Restart Required"),
+                    tr("The language change will take effect after an "
+                       "application restart."));
+                preferences->setValue(
+                    QStringLiteral("language"),
+                    QString::fromLatin1(m_languageToLocale[index]));
+            });
+
     if (undoStack->undoLimit()) {
         ui->checkUndoLimit->setChecked(true);
         ui->undoLimitBox->setValue(undoStack->undoLimit());

diff --git a/gui/preferencesdialog.h b/gui/preferencesdialog.h
@@ -43,6 +43,9 @@ class PreferencesDialog : public QDialog
     ~PreferencesDialog();
 
 private:
+    /// Language to locale mapping in the same order as presented in the dialog.
+    static const char* const m_languageToLocale[];
+
     std::unique_ptr<Ui::PreferencesDialog> ui;
 };
 

diff --git a/gui/preferencesdialog.ui b/gui/preferencesdialog.ui
@@ -28,6 +28,11 @@
        <string notr="true">English</string>
       </property>
      </item>
+     <item>
+      <property name="text">
+       <string notr="true">Русский</string>
+      </property>
+     </item>
     </widget>
    </item>
    <item row="1" column="0">