QmlJSInspector: Enable/Disable based on engine state

Change-Id: I078d12fb16fe61908e5b90ebf819c9fd9e8faae0
Reviewed-by: Kai Koehne <kai.koehne@nokia.com>

src/plugins/qmljsinspector/qmljspropertyinspector.cpp

@@ -255,6 +255,30 @@ inline QString cleanPropertyValue(QString propertyValue)
     return propertyValue;
 }
 
+// *************************************************************************
+//  QmlJSPropertyInspectorModel
+// *************************************************************************
+QmlJSPropertyInspectorModel::QmlJSPropertyInspectorModel()
+    : QStandardItemModel()
+    , m_contentsValid(false)
+{
+}
+
+Qt::ItemFlags QmlJSPropertyInspectorModel::flags(const QModelIndex &index) const
+{
+    return m_contentsValid ? QStandardItemModel::flags(index) : Qt::ItemFlags();
+}
+
+void QmlJSPropertyInspectorModel::setContentsValid(bool contentsValid)
+{
+    m_contentsValid = contentsValid;
+}
+
+bool QmlJSPropertyInspectorModel::contentsValid() const
+{
+    return m_contentsValid;
+}
+
 QmlJSPropertyInspector::QmlJSPropertyInspector(QWidget *parent)
     : QTreeView(parent)
 {
@@ -285,6 +309,16 @@ void QmlJSPropertyInspector::clear()
     m_currentObjects.clear();
 }
 
+void QmlJSPropertyInspector::setContentsValid(bool contentsValid)
+{
+    m_model.setContentsValid(contentsValid);
+}
+
+bool QmlJSPropertyInspector::contentsValid() const
+{
+    return m_model.contentsValid();
+}
+
 void QmlJSPropertyInspector::setCurrentObjects(const QList<QmlDebugObjectReference> &objectList)
 {
     if (objectList.isEmpty())