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.

re/dbccomparatorwindow.h

@@ -0,0 +1,45 @@
+#ifndef DBCCOMPARATORWINDOW_H
+#define DBCCOMPARATORWINDOW_H
+
+#include <QDialog>
+#include <QDebug>
+#include <QTreeWidget>
+#include "framefileio.h"
+#include "dbc/dbc_classes.h"
+#include "dbc/dbchandler.h"
+#include "utility.h"
+
+namespace Ui {
+class DBCComparatorWindow;
+}
+
+class DBCComparatorWindow : public QDialog
+{
+    Q_OBJECT
+
+public:
+    explicit DBCComparatorWindow(QWidget *parent = 0);
+    ~DBCComparatorWindow();
+
+private slots:
+    void loadFirstFile();
+    void loadSecondFile();
+    void saveDetails();
+
+private:
+    Ui::DBCComparatorWindow *ui;
+    DBCFile *firstDBC;
+    DBCFile *secondDBC;
+    QString firstDBCFilename;
+    QString secondDBCFilename;
+
+    void calculateDetails();
+    void showEvent(QShowEvent *);
+    void closeEvent(QCloseEvent *event);
+    bool eventFilter(QObject *obj, QEvent *event);
+    QString loadDBC(DBCFile **file);
+    void readSettings();
+    void writeSettings();
+};
+
+#endif //DBCCOMPARATORWINDOW_H