Error handling in GUI

Added an decorator for the class so that all exceptions thrown in the GUI will be caught and a stacktrace displayed. This also should prevent the GUI from totally crashing so that the user has time to save their stuff. Closes #83 (closed)

b_asic/GUI/drag_button.py

@@ -3,23 +3,25 @@ Drag button class.
 This class creates a dragbutton which can be clicked, dragged and dropped.
 """
 
-
 import os.path
 
 from PyQt5.QtWidgets import QPushButton
 from PyQt5.QtCore import Qt, QSize
 from PyQt5.QtGui import QIcon
 
+from utils import decorate_class, handle_error
+
 
+@decorate_class(handle_error)
 class DragButton(QPushButton):
     def __init__(self, name, operation, operation_path_name, window, parent = None):
         self.name = name
-        self.__window = window
+        self._window = window
         self.operation = operation
         self.operation_path_name = operation_path_name
         self.clicked = 0
         self.pressed = False
-        super(DragButton, self).__init__(self.__window)
+        super(DragButton, self).__init__(self._window)
 
     def mousePressEvent(self, event):
         self._mouse_press_pos = None
@@ -29,7 +31,7 @@ class DragButton(QPushButton):
             self._mouse_press_pos = event.globalPos()
             self._mouse_move_pos = event.globalPos()
 
-            for signal in self.__window.signalList:
+            for signal in self._window.signalList:
                 signal.update()
 
             self.clicked += 1
@@ -40,7 +42,7 @@ class DragButton(QPushButton):
                 path_to_image = os.path.join('operation_icons', self.operation_path_name + '_grey.png')
                 self.setIcon(QIcon(path_to_image))
                 self.setIconSize(QSize(50, 50))
-                self.__window.pressed_button.append(self)
+                self._window.pressed_button.append(self)
 
             elif self.clicked == 2:
                 self.clicked = 0
@@ -50,7 +52,7 @@ class DragButton(QPushButton):
                 path_to_image = os.path.join('operation_icons', self.operation_path_name + '.png')
                 self.setIcon(QIcon(path_to_image))
                 self.setIconSize(QSize(50, 50))
-                self.__window.pressed_button.remove(self)
+                self._window.pressed_button.remove(self)
 
         super(DragButton, self).mousePressEvent(event)
 
@@ -63,8 +65,8 @@ class DragButton(QPushButton):
             self.move(new_pos)
 
             self._mouse_move_pos = global_pos
-        
-        self.__window.update()
+
+        self._window.update()
         super(DragButton, self).mouseMoveEvent(event)
 
     def mouseReleaseEvent(self, event):