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events.py
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events.py
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'''
events - module containing standard consoleui events and the global event manager
'''
import types
from consoleui import errors
class EventManager(object):
def __init__(self, *args, **kwargs):
self.name = kwargs['name']
self.observers = {}
def observe(self, event_name, handler_func):
if not isinstance(handler_func, types.MethodType) and not isinstance(handler_func, types.FunctionType):
raise errors.InvalidArgumentError(('NotificationCenter.observe() requires a function', handler_func))
if not self.observers.get(event_name):
self.observers[event_name] = []
self.observers[event_name].append(handler_func)
def unobserve(self, event_name, handler_func):
'''
Remove handler_func from observing event_name
Returns True on success, False on failure
'''
if not isinstance(handler_func, types.MethodType) and not isinstance(handler_func, types.FunctionType):
raise errors.InvalidArgumentError(('NotificationCenter.observe() requires a function', handler_func))
if not self.observers.get(event_name):
return False
stack = []
rc = False
for func in self.observers[event_name]:
if func == handler_func:
rc = True
continue
stack.append(func)
self.observers[event_name] = stack
return rc
def fire(self, event_name, **eventkwargs):
'''
Fire the actual event, this will cause observers to execute serially
Returns a list of return values from observers
'''
rc = []
if self.observers.get(event_name):
for func in self.observers[event_name]:
rc.append( func(event_name, **eventkwargs) )
return rc
class Standard(object):
GainFocus = 'consoleui.WidgetGainingFocus'
LoseFOcus = 'consoleui.WidgetLosingFocus'
Quit = 'consoleui.ApplicationQuit'
Exiting = 'consoleui.ApplicationIsExiting'
Closing = 'consoleui.WidgetClosing'
manager = EventManager(name='Global Notification Center')