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Document singleton

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Contributes to issues CURA-340 and CURA-1278.
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Ghostkeeper 2016-06-07 15:26:51 +02:00
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cura/ExtruderManager.py
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@ -39,7 +39,18 @@ class ExtruderManager(QObject):
except KeyError: #Extruder index could be -1 if the global tab is selected, or the entry doesn't exist if the machine definition is wrong.
return None
## The instance of the singleton pattern.
#
# It's None if the extruder manager hasn't been created yet.
__instance = None
## Gets an instance of the extruder manager, or creates one if no instance
# exists yet.
#
# This is an implementation of singleton. If an extruder manager already
# exists, it is re-used.
#
# \return The extruder manager.
@classmethod
def getInstance(cls):
if not cls.__instance: