New project structure

Load translation file in the executable.

src/main.cpp

@@ -0,0 +1,63 @@
+#include "ui/mainwindow.h"
+
+#include <QApplication>
+#include <QSettings>
+#include <QTranslator>
+#include <QMessageBox>
+#include <QTextCodec>
+#include <QDir>
+
+int main(int argc, char *argv[])
+{
+    // A trick to handle non-ascii path
+    // The application cannot find the plugins when the path contains non ascii characters.
+    // However, the plugins will be load after creating MainWindow(or QApplication?).
+    // QDir will handle the path correctly.
+    QDir* pluginDir = new QDir;
+    if(pluginDir->cd("plugins")) // has plugins folder
+    {
+        qputenv("QT_PLUGIN_PATH", pluginDir->absolutePath().toLocal8Bit());
+    }
+    delete pluginDir;
+
+    QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
+    QTextCodec::setCodecForLocale(QTextCodec::codecForName("UTF-8"));
+    QApplication a(argc, argv);
+    MainWindow w;
+
+    QSettings* settings = new QSettings("GUIsettings.ini", QSettings::IniFormat);
+    settings->setIniCodec("UTF-8");
+    settings->beginGroup("lang");
+    QString currLang = settings->value("language", "").toString();
+    settings->endGroup();
+    if(currLang == "")
+    {
+        if(Util::chooseLanguage(settings, &w))
+        {
+            settings->beginGroup("lang");
+            currLang = settings->value("language", "").toString();
+            settings->endGroup();
+        }
+        else
+            currLang = "en_US";
+    }
+    if(currLang == "ext")
+        currLang = QFileDialog::getOpenFileName(nullptr, "Select the translation file:");
+    else
+        currLang = ":/i18n/" + currLang + ".qm";
+    QTranslator* translator = new QTranslator(&w);
+    if(translator->load(currLang))
+    {
+        a.installTranslator(translator);
+    }
+    else
+    {
+        QMessageBox::information(&w, "Error", "Can't load " + currLang + " as translation file.");
+    }
+    delete settings;
+    w.initUI();
+    w.show();
+    return a.exec();
+}
+
+