QML Settings: fix JS array handling

Before Qt 5.4, JS arrays were passed as QVariantLists. Since Qt 5.4,
they are passed as QJSValues instead. Use QJSValue::toVariant()
(the same way as QQuickItemView::setModel(QVariant) which was fixed
in cf959b4b) to convert JS values to QSettings-compatible variants.

Task-number: QTBUG-45316
Change-Id: Icc6f8ad09bfef089d9efcf5b90e3783bb3f73a9f
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>

1 files changed, 15 insertions, 3 deletions

diff --git a/src/imports/settings/qqmlsettings.cpp b/src/imports/settings/qqmlsettings.cpp
index cd6fcbc718..df67c04654 100644
--- a/src/imports/settings/qqmlsettings.cpp
+++ b/src/imports/settings/qqmlsettings.cpp
@@ -41,6 +41,7 @@
 #include <qcoreevent.h>
 #include <qsettings.h>
 #include <qpointer.h>
+#include <qjsvalue.h>
 #include <qdebug.h>
 #include <qhash.h>
 
@@ -241,6 +242,7 @@ public:
     void store();
 
     void _q_propertyChanged();
+    QVariant readProperty(const QMetaProperty &property) const;
 
     QQmlSettings *q_ptr;
     int timerId;
@@ -295,7 +297,7 @@ void QQmlSettingsPrivate::load()
     for (int i = offset; i < count; ++i) {
         QMetaProperty property = mo->property(i);
 
-        const QVariant previousValue = property.read(q);
+        const QVariant previousValue = readProperty(property);
         const QVariant currentValue = instance()->value(property.name(), previousValue);
 
         if (!currentValue.isNull() && (!previousValue.isValid()
@@ -340,9 +342,10 @@ void QQmlSettingsPrivate::_q_propertyChanged()
     const int count = mo->propertyCount();
     for (int i = offset; i < count; ++i) {
         const QMetaProperty &property = mo->property(i);
-        changedProperties.insert(property.name(), property.read(q));
+        const QVariant value = readProperty(property);
+        changedProperties.insert(property.name(), value);
 #ifdef SETTINGS_DEBUG
-        qDebug() << "QQmlSettings: cache" << property.name() << ":" << property.read(q);
+        qDebug() << "QQmlSettings: cache" << property.name() << ":" << value;
 #endif
     }
     if (timerId != 0)
@@ -350,6 +353,15 @@ void QQmlSettingsPrivate::_q_propertyChanged()
     timerId = q->startTimer(settingsWriteDelay);
 }
 
+QVariant QQmlSettingsPrivate::readProperty(const QMetaProperty &property) const
+{
+    Q_Q(const QQmlSettings);
+    QVariant var = property.read(q);
+    if (var.userType() == qMetaTypeId<QJSValue>())
+        var = var.value<QJSValue>().toVariant();
+    return var;
+}
+
 QQmlSettings::QQmlSettings(QObject *parent)
     : QObject(parent), d_ptr(new QQmlSettingsPrivate)
 {