4 files changed, 158 insertions, 2 deletions

diff --git a/desktop-widgets/preferences/CMakeLists.txt b/desktop-widgets/preferences/CMakeLists.txt
index 953c587b1..6af8b4a73 100644
--- a/desktop-widgets/preferences/CMakeLists.txt
+++ b/desktop-widgets/preferences/CMakeLists.txt
@@ -1,9 +1,21 @@
 # the profile widget
+include_directories(.
+	${CMAKE_CURRENT_BINARY_DIR}
+	${CMAKE_BINARY_DIR}
+)
+
+file(GLOB SUBSURFACE_PREFERENCES_UI *.ui)
+qt5_wrap_ui(SUBSURFACE_PREFERENCES_UI_HDRS ${SUBSURFACE_PREFERENCES_UI})
+
+source_group("Subsurface Interface Files" FILES ${SUBSURFACE_PREFERENCES_UI})
+
 set(SUBSURFACE_PREFERENCES_LIB_SRCS
 	abstractpreferenceswidget.cpp
+	preferences_language.cpp
 )
 
 source_group("Subsurface Preferences" FILES ${SUBSURFACE_PREFERENCES_LIB_SRCS})
 
-add_library(subsurface_desktop_preferences STATIC ${SUBSURFACE_PREFERENCES_LIB_SRCS})
-target_link_libraries(subsurface_desktop_preferences ${QT_LIBRARIES})
\ No newline at end of file
+add_library(subsurface_desktop_preferences STATIC ${SUBSURFACE_PREFERENCES_LIB_SRCS} ${SUBSURFACE_PREFERENCES_UI_HDRS})
+target_link_libraries(subsurface_desktop_preferences ${QT_LIBRARIES})
+
diff --git a/desktop-widgets/preferences/preferences_language.cpp b/desktop-widgets/preferences/preferences_language.cpp
new file mode 100644
index 000000000..7254482e2
--- /dev/null
+++ b/desktop-widgets/preferences/preferences_language.cpp
@@ -0,0 +1,47 @@
+#include "preferences_language.h"
+#include "ui_prefs_language.h"
+
+#include <QApplication>
+#include <QSettings>
+#include <QMessageBox>
+
+
+PreferencesLanguage::PreferencesLanguage() : AbstractPreferencesWidget(tr("Language"), QIcon(":/language"), 4)
+{
+	ui = new Ui::PreferencesLanguage();
+	ui->setupUi(this);
+}
+
+PreferencesLanguage::~PreferencesLanguage()
+{
+	delete ui;
+}
+
+void PreferencesLanguage::refreshSettings()
+{
+	QSettings s;
+	s.beginGroup("Language");
+	ui->languageSystemDefault->setChecked(s.value("UseSystemLanguage", true).toBool());
+	QAbstractItemModel *m = ui->languageView->model();
+	QModelIndexList languages = m->match(m->index(0, 0), Qt::UserRole, s.value("UiLanguage").toString());
+	if (languages.count())
+		ui->languageView->setCurrentIndex(languages.first());
+	s.endGroup();
+}
+
+void PreferencesLanguage::syncSettings()
+{
+	// Locale
+	QLocale loc;
+	QSettings s;
+	s.beginGroup("Language");
+	bool useSystemLang = s.value("UseSystemLanguage", true).toBool();
+	if (useSystemLang != ui->languageSystemDefault->isChecked() ||
+	    (!useSystemLang && s.value("UiLanguage").toString() != ui->languageView->currentIndex().data(Qt::UserRole))) {
+		QMessageBox::warning(this, tr("Restart required"),
+			tr("To correctly load a new language you must restart Subsurface."));
+	}
+	s.setValue("UseSystemLanguage", ui->languageSystemDefault->isChecked());
+	s.setValue("UiLanguage", ui->languageView->currentIndex().data(Qt::UserRole));
+	s.endGroup();
+}
\ No newline at end of file
diff --git a/desktop-widgets/preferences/preferences_language.h b/desktop-widgets/preferences/preferences_language.h
new file mode 100644
index 000000000..43014c0fd
--- /dev/null
+++ b/desktop-widgets/preferences/preferences_language.h
@@ -0,0 +1,21 @@
+#ifndef PREFERENCES_LANGUAGE_H
+#define PREFERENCES_LANGUAGE_H
+
+#include "abstractpreferenceswidget.h"
+
+namespace Ui {
+	class PreferencesLanguage;
+}
+
+class PreferencesLanguage : public AbstractPreferencesWidget {
+	Q_OBJECT
+public:
+	PreferencesLanguage();
+	virtual ~PreferencesLanguage();
+	virtual void refreshSettings();
+	virtual void syncSettings();
+private:
+	Ui::PreferencesLanguage *ui;
+};
+
+#endif
\ No newline at end of file
diff --git a/desktop-widgets/preferences/prefs_language.ui b/desktop-widgets/preferences/prefs_language.ui
new file mode 100644
index 000000000..80671fca8
--- /dev/null
+++ b/desktop-widgets/preferences/prefs_language.ui
@@ -0,0 +1,76 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>PreferencesLanguage</class>
+ <widget class="QWidget" name="PreferencesLanguage">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>576</width>
+    <height>523</height>
+   </rect>
+  </property>
+  <property name="windowTitle">
+   <string>Form</string>
+  </property>
+  <layout class="QVBoxLayout" name="verticalLayout">
+   <item>
+    <widget class="QGroupBox" name="language_group">
+     <property name="sizePolicy">
+      <sizepolicy hsizetype="MinimumExpanding" vsizetype="Preferred">
+       <horstretch>0</horstretch>
+       <verstretch>0</verstretch>
+      </sizepolicy>
+     </property>
+     <property name="title">
+      <string>UI language</string>
+     </property>
+     <layout class="QHBoxLayout" name="horizontalLayout">
+      <item>
+       <widget class="QCheckBox" name="languageSystemDefault">
+        <property name="text">
+         <string>System default</string>
+        </property>
+       </widget>
+      </item>
+      <item>
+       <spacer name="horizontalSpacer">
+        <property name="orientation">
+         <enum>Qt::Horizontal</enum>
+        </property>
+        <property name="sizeHint" stdset="0">
+         <size>
+          <width>203</width>
+          <height>20</height>
+         </size>
+        </property>
+       </spacer>
+      </item>
+      <item>
+       <widget class="QLabel" name="label_14">
+        <property name="text">
+         <string>Filter</string>
+        </property>
+       </widget>
+      </item>
+      <item>
+       <widget class="QLineEdit" name="languageFilter"/>
+      </item>
+     </layout>
+    </widget>
+   </item>
+   <item>
+    <widget class="QListView" name="languageView">
+     <property name="sizePolicy">
+      <sizepolicy hsizetype="MinimumExpanding" vsizetype="MinimumExpanding">
+       <horstretch>0</horstretch>
+       <verstretch>0</verstretch>
+      </sizepolicy>
+     </property>
+    </widget>
+   </item>
+  </layout>
+ </widget>
+ <resources/>
+ <connections/>
+</ui>