allow checkboxes with callback, return created action object, consistent naming

grum/menus/menubase.py

@@ -10,19 +10,24 @@ class MenuBase:
     def __init__(self):
         self.checkboxes = {}
 
-    def addAction(self, name, func):
-        action = QAction(name, triggered=func, parent=self.qmenu)
+    def addAction(self, name, triggered):
+        action = QAction(name, triggered=triggered, parent=self.qmenu)
         self.qmenu.addAction(action)
+        return action
 
     def addSeparator(self):
         self.qmenu.addSeparator()
 
-    #TODO: allow checkboxes with callback?
-    def addCheckbox(self, name, state=False):
-        action = QAction(name, checkable=True, parent=self.qmenu)
+    def addCheckbox(self, name, state=False, triggered=None):
+        # QAction does not accept triggered=None
+        kwargs = dict(checkable=True, parent=self.qmenu)
+        if triggered:
+            kwargs.update(triggered=triggered)
+        action = QAction(name, **kwargs)
         action.setChecked(state)
         self.qmenu.addAction(action)
         self.checkboxes[name] = action
+        return action