scene are deleted on gui thread

src/core/UBPersistenceManager.cpp

@@ -86,6 +86,7 @@ UBPersistenceManager::UBPersistenceManager(QObject *pParent)
     connect(mWorker, SIGNAL(finished()), mWorker, SLOT(deleteLater()));
     connect(mThread, SIGNAL(finished()), mThread, SLOT(deleteLater()));
     connect(mWorker,SIGNAL(sceneLoaded(QByteArray,UBDocumentProxy*,int)),this,SLOT(onSceneLoaded(QByteArray,UBDocumentProxy*,int)));
+    connect(mWorker,SIGNAL(scenePersisted(UBGraphicsScene*)),this,SLOT(onScenePersisted(UBGraphicsScene*)));
     mThread->start();
 
 }
@@ -107,6 +108,12 @@ void UBPersistenceManager::destroy()
     sSingleton = NULL;
 }
 
+void UBPersistenceManager::onScenePersisted(UBGraphicsScene* scene)
+{
+    delete scene;
+    scene = NULL;
+}
+
 void UBPersistenceManager::onWorkerFinished()
 {
     mIsWorkerFinished = true;

src/core/UBPersistenceManager.h

@@ -160,6 +160,7 @@ class UBPersistenceManager : public QObject
         void errorString(QString error);
         void onSceneLoaded(QByteArray,UBDocumentProxy*,int);
         void onWorkerFinished();
+        void onScenePersisted(UBGraphicsScene* scene);
 };
 
 

src/core/UBPersistenceWorker.cpp

@@ -63,8 +63,9 @@ void UBPersistenceWorker::process()
         PersistenceInformation info = saves.takeFirst();
         if(info.action == WriteScene){
             UBSvgSubsetAdaptor::persistScene(info.proxy, info.scene, info.sceneIndex);
-            delete info.scene;
+//            delete info.scene;
-            info.scene = NULL;
+//            info.scene = NULL;
+            emit scenePersisted(info.scene);
         }
         else{
             emit sceneLoaded(UBSvgSubsetAdaptor::loadSceneAsText(info.proxy,info.sceneIndex), info.proxy, info.sceneIndex);

src/core/UBPersistenceWorker.h

@@ -55,6 +55,7 @@ signals:
    void finished();
    void error(QString string);
    void sceneLoaded(QByteArray text,UBDocumentProxy* proxy, const int pageIndex);
+   void scenePersisted(UBGraphicsScene* scene);
 
 public slots:
    void process();