Make buttons toggleable by single clicking

FileHandler.cpp

@@ -4,6 +4,7 @@
 #include <QTextStream>
 #include <QFile>
 #include <QDir>
+
 #include "Scene.h"
 #include "Part.h"
 #include "Wire.h"
@@ -14,8 +15,6 @@
 
 #include "Parts/IntegratedCircuit.h"
 
-#include <QDebug>
-
 FileHandler::FileHandler(Logic* logic)
     :m_logic(logic)
 {
@@ -74,11 +73,12 @@ bool FileHandler::open(QString filename)
 
     enum Sector
     {
+        None,
         Parts,
         Wires
     };
 
-    Sector currentSector;
+    Sector currentSector = None;
 
     // A .csim file stores all parts with IDs, this map simply keeps track of which ID corresponds to which pointer
     QMap<QString, Part*> idPartPointerMap;
@@ -116,6 +116,9 @@ bool FileHandler::open(QString filename)
             if(words.length() < 4)
                 return false;
 
+            if(currentSector == None)
+                return false;
+
             if(currentSector == Parts)
             {
                 PartType::PartType type = (PartType::PartType)words[1].toInt();