Add tracking of DBC editing in order to warn when exiting without saving, add sorting to DBC routines, add a new screen that allows one to compare two DBC files for changes/differences.

dbc/dbchandler.h

@@ -29,6 +29,8 @@ public:
     bool removeSignal(QString name);
     void removeAllSignals();
     int getCount();
+    void sort();
+
 private:
     QList<DBC_SIGNAL> sigs; //signals is a reserved word or I'd have used that
 };
@@ -52,6 +54,8 @@ public:
     void setMatchingCriteria(MatchingCriteria_t mc);
     void setFilterLabeling( bool labelFiltering );
     bool filterLabeling();
+    void sort();
+
 private:
     QList<DBC_MESSAGE> messages;
     MatchingCriteria_t matchingCriteria;
@@ -79,6 +83,9 @@ public:
     QString getPath();
     int getAssocBus();
     void setAssocBus(int bus);
+    void setDirtyFlag();
+    bool getDirtyFlag();
+    void sort();
 
     DBCMessageHandler *messageHandler;
     QList<DBC_NODE> dbc_nodes;
@@ -87,6 +94,7 @@ private:
     QString fileName;
     QString filePath;
     int assocBuses; //-1 = all buses, 0 = first bus, 1 = second bus, etc.
+    bool isDirty; //has the file been modified?
 
     bool parseAttribute(QString inpString, DBC_ATTRIBUTE &attr);
     QVariant processAttributeVal(QString input, DBC_ATTRIBUTE_VAL_TYPE typ);