Develop method for context menu classes to signal that they should be…

… displayed, but disabled. This will allow us to determine if a context menu exists for a certain context (stats panel, for example) without relying on old logic of not displaying them if fitting is not loaded.

gui/builtinContextMenus/damagePattern.py

@@ -20,7 +20,11 @@ def display(self, srcContext, selection):
         if not self.settings.get('damagePattern'):
             return False
 
-        return srcContext == "resistancesViewFull" and self.mainFrame.getActiveFit() is not None
+        return srcContext == "resistancesViewFull"
+
+    @property
+    def enabled(self):
+        return self.mainFrame.getActiveFit() is not None
 
     def getText(self, itmContext, selection):
         sDP = import_DamagePattern.getInstance()

gui/builtinContextMenus/factorReload.py

@@ -17,7 +17,11 @@ def display(self, srcContext, selection):
         if not self.settings.get('factorReload'):
             return False
 
-        return srcContext == "firepowerViewFull" and self.mainFrame.getActiveFit() is not None
+        return srcContext == "firepowerViewFull"
+
+    @property
+    def enabled(self):
+        return self.mainFrame.getActiveFit() is not None
 
     def getText(self, itmContext, selection):
         return "Factor in Reload Time"

gui/contextMenu.py

@@ -33,6 +33,16 @@ class ContextMenu(object):
     def register(cls):
         ContextMenu.menus.append(cls)
 
+    @classmethod
+    def hasMenu(cls, selection, *fullContexts):
+        for i, fullContext in enumerate(fullContexts):
+            srcContext = fullContext[0]
+            for menuHandler in cls.menus:
+                m = menuHandler()
+                if m.display(srcContext, selection):
+                    return True
+            return False
+
     @classmethod
     def getMenu(cls, selection, *fullContexts):
         """
@@ -117,6 +127,7 @@ def getMenu(cls, selection, *fullContexts):
 
                         if check is not None:
                             rootItem.Check(check)
+                        rootItem.Enable(m.enabled)
 
                     empty = False
 
@@ -186,6 +197,11 @@ def checked(self):
         '''If menu item is toggleable, this should return bool value'''
         return None
 
+    @property
+    def enabled(self):
+        '''If menu item is enabled. Allows an item to display, but not be selected'''
+        return True
+
 # noinspection PyUnresolvedReferences
 from gui.builtinContextMenus import (  # noqa: E402,F401
     openFit,