From 20325f200780bedcaf75c7dea891f5c22daf9b4e Mon Sep 17 00:00:00 2001
From: nds <nds@opencascade.com>
Date: Thu, 1 Dec 2016 14:21:16 +0300
Subject: [PATCH] Issue #1900 Fatal error when close study

---
 src/XGUI/XGUI_DataModel.cpp | 5 ++++-
 src/XGUI/XGUI_DataModel.h   | 5 +++++
 src/XGUI/XGUI_Workshop.cpp  | 5 +++++
 3 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/src/XGUI/XGUI_DataModel.cpp b/src/XGUI/XGUI_DataModel.cpp
index 6e0acaba8..1a4efa787 100644
--- a/src/XGUI/XGUI_DataModel.cpp
+++ b/src/XGUI/XGUI_DataModel.cpp
@@ -62,7 +62,8 @@ ModelAPI_Document* getSubDocument(void* theObj)
 
 
 // Constructor *************************************************
-XGUI_DataModel::XGUI_DataModel(QObject* theParent) : QAbstractItemModel(theParent)
+XGUI_DataModel::XGUI_DataModel(QObject* theParent) : QAbstractItemModel(theParent),
+  myIsEventsProcessingStopped(false)
 {
   Events_Loop* aLoop = Events_Loop::loop();
   aLoop->registerListener(this, Events_Loop::eventByName(EVENT_OBJECT_CREATED));
@@ -79,6 +80,8 @@ XGUI_DataModel::~XGUI_DataModel()
 //******************************************************
 void XGUI_DataModel::processEvent(const std::shared_ptr<Events_Message>& theMessage)
 {
+  if (myIsEventsProcessingStopped)
+    return;
   DocumentPtr aRootDoc = ModelAPI_Session::get()->moduleDocument();
   std::string aRootType = myXMLReader->rootType();
   std::string aSubType = myXMLReader->subType();
diff --git a/src/XGUI/XGUI_DataModel.h b/src/XGUI/XGUI_DataModel.h
index a57f85c20..f3dc27c13 100644
--- a/src/XGUI/XGUI_DataModel.h
+++ b/src/XGUI/XGUI_DataModel.h
@@ -125,6 +125,9 @@ public:
   /// Initialises XML data model reader. It must be initialised before DataModel using.
   void setXMLReader(Config_DataModelReader* theReader) { myXMLReader = theReader; }
 
+  /// Do not processing anymore events of model loop
+  void stopEventsProcessing() { myIsEventsProcessingStopped = true; }
+
 signals:
   /// Signal about tree had been rebuilt
   void treeRebuilt();
@@ -161,6 +164,8 @@ private:
   QStringList listOfShowNotEmptyFolders(bool fromRoot = true) const;
 
   Config_DataModelReader* myXMLReader;
+
+  bool myIsEventsProcessingStopped;
 };
 
 #endif
\ No newline at end of file
diff --git a/src/XGUI/XGUI_Workshop.cpp b/src/XGUI/XGUI_Workshop.cpp
index 6996a2d02..8b7aa83a5 100755
--- a/src/XGUI/XGUI_Workshop.cpp
+++ b/src/XGUI/XGUI_Workshop.cpp
@@ -24,6 +24,7 @@
 #include <XGUI_CustomPrs.h>
 #include <XGUI_HistoryMenu.h>
 #include <XGUI_QtEvents.h>
+#include <XGUI_DataModel.h>
 
 #ifndef HAVE_SALOME
 #include <AppElements_Button.h>
@@ -2029,6 +2030,10 @@ void XGUI_Workshop::closeDocument()
 
   module()->closeDocument();
 
+  // data model need not process the document's signals about objects modifications as
+  // the document is closed
+  objectBrowser()->dataModel()->stopEventsProcessing();
+
   SessionPtr aMgr = ModelAPI_Session::get();
   aMgr->closeAll();
 }
-- 
2.39.2