Selettore lingua (System/EN/IT) nelle impostazioni con QTranslator in main.cpp (pattern quill); fix 'Close book' con pop fino alla prima pagina

src/main.cpp

@@ -2,6 +2,7 @@
 #include <QGuiApplication>
 #include <QQuickView>
 #include <QQmlContext>
+#include <QTranslator>
 #include <sailfishapp.h>
 
 #include "apiclient.h"
@@ -12,13 +13,36 @@
 Q_DECL_EXPORT int main(int argc, char *argv[])
 {
     QGuiApplication *app = SailfishApp::application(argc, argv);
+
+    Settings settings;
+
+    // User-chosen language (Settings -> Language). "system" = Sailfish UI
+    // language (libsailfishapp already installed its translator). "en" =
+    // force English (remove all translators). "it" = force Italian.
+    const QString lang = settings.language();
+    if (lang == "en" || lang == "it") {
+        const QList<QTranslator *> trs = app->findChildren<QTranslator *>();
+        foreach (QTranslator *t, trs) {
+            app->removeTranslator(t);
+            t->deleteLater();
+        }
+        if (lang == "it") {
+            QTranslator *translator = new QTranslator(app);
+            if (translator->load(QStringLiteral("harbour-calibreweb_it"),
+                                 QStringLiteral("/usr/share/translations"))) {
+                app->installTranslator(translator);
+            } else {
+                qWarning() << "harbour-calibreweb: cannot load harbour-calibreweb_it.qm";
+            }
+        }
+    }
+
     QQuickView *view = SailfishApp::createView();
 
     qDebug() << "harbour-calibreweb v0.2.0 build" << __DATE__ << __TIME__;
 
     qmlRegisterType<EpubBook>("harbour.calibreweb", 1, 0, "EpubBook");
 
-    Settings settings;
     ApiClient apiClient(&settings);
     Downloader downloader(&settings);
 

src/settings.cpp

@@ -152,6 +152,20 @@ void Settings::setReaderMarginV(int value)
     emit readerMarginVChanged();
 }
 
+QString Settings::language() const
+{
+    return m_settings.value(QStringLiteral("language"), QStringLiteral("system")).toString();
+}
+
+void Settings::setLanguage(const QString &value)
+{
+    if (value == language())
+        return;
+    m_settings.setValue(QStringLiteral("language"), value);
+    m_settings.sync();
+    emit languageChanged();
+}
+
 QString Settings::downloadDir() const
 {
     QString dir = QStandardPaths::writableLocation(QStandardPaths::DownloadLocation);

src/settings.h

@@ -14,6 +14,8 @@ class Settings : public QObject
     Q_PROPERTY(bool ignoreSslErrors READ ignoreSslErrors WRITE setIgnoreSslErrors NOTIFY ignoreSslErrorsChanged)
     Q_PROPERTY(int readerMargin READ readerMargin WRITE setReaderMargin NOTIFY readerMarginChanged)
     Q_PROPERTY(int readerMarginV READ readerMarginV WRITE setReaderMarginV NOTIFY readerMarginVChanged)
+    // lingua scelta dall'utente: "system" (predefinita, lingua UI Sailfish), "en", "it"
+    Q_PROPERTY(QString language READ language WRITE setLanguage NOTIFY languageChanged)
     Q_PROPERTY(QString downloadDir READ downloadDir CONSTANT)
     // derivata da serverUrl (senza slash finale): accesso QML come appSettings.baseUrl
     Q_PROPERTY(QString baseUrl READ baseUrl NOTIFY baseUrlChanged)
@@ -41,6 +43,10 @@ public:
     int readerMarginV() const;
     void setReaderMarginV(int value);
 
+    // lingua dell'interfaccia: "system" (default) | "en" | "it"
+    QString language() const;
+    void setLanguage(const QString &value);
+
     QString downloadDir() const;
 
     // Header "Authorization: Basic ..." pronto da usare, vuoto se utente non impostato
@@ -63,6 +69,7 @@ signals:
     void ignoreSslErrorsChanged();
     void readerMarginChanged();
     void readerMarginVChanged();
+    void languageChanged();
     void baseUrlChanged();
 
 private: