Metadata-Version: 1.1
Name: Events
Version: 0.4
Summary: Bringing the elegance of C# EventHandler to Python
Home-page: http://github.com/pyeve/events
Author: Nicola Iarocci
Author-email: nicola@nicolaiarocci.com
License: BSD
Description: Events 
        ------
        
        The C# language provides a handy way to declare, subscribe to and fire events.
        Technically, an event is a "slot" where callback functions (event handlers) can
        be attached to - a process referred to as subscribing to an event. Here is
        a handy package that encapsulates the core to event subscription and event
        firing and feels like a "natural" part of the language.
        
        ::
         
            >>> def something_changed(reason): 
            ...     print "something changed because %s" % reason 
        
            >>> from events import Events
            >>> events = Events()
            >>> events.on_change += something_changed
        
        Multiple callback functions can subscribe to the same event. When the event is
        fired, all attached event handlers are invoked in sequence. To fire the event,
        perform a call on the slot: 
        
        ::
        
            >>> events.on_change('it had to happen')
            'something changed because it had to happen'
        
        By default, Events does not check if an event can be subscribed to and fired.
        You can predefine events by subclassing Events and listing them. Attempts to
        subscribe to or fire an undefined event will raise an EventsException.
        
        ::
        
            >>> class MyEvents(Events):
            ...     __events__ = ('on_this', 'on_that', )
        
            >>> events = MyEvents()
        
            # this will raise an EventsException as `on_change` is unknown to MyEvents:
            >>> events.on_change += something_changed
        
        You can also predefine events for a single Events instance by passing an
        iterator to the constructor.
        
        ::
        
            >>> events = Events(('on_this', 'on_that'))
        
            # this will raise an EventsException as `on_change` is unknown to events:
            >>> events.on_change += something_changed
        
        
        Unsubscribing
        -------------
        There may come a time when you no longer want to be notified of an event. In
        this case, you unsubscribe in the natural counterpart to `+=` by using `-=`.
        
        ::
        
            # We no longer want to be notified, take us out of the event callback list
            >>> events.on_change -= something_changed
        
        
        You may also want to unsubscribe for memory management reasons. The `Events()` instance
        will hold a reference `something_changed`. If this is a member method of an object,
        and the lifetime of the `Events()` instance is greater than that object, it will keep
        it around longer than would be the normal case.
        
        Documentation
        -------------
        Complete documentation is available at http://events.readthedocs.org
        
        Installing
        ----------
        Events is on PyPI so all you need to do is:
        
        ::
        
            pip install events
        
        Testing
        -------
        Just run:
        
        ::
        
            python setup.py test
        
        Or use tox to test the package under all supported Pythons: 2.7, 3.4+
        
        Licenseing
        ----------
        Events is BSD licensed. See the LICENSE_ for details.
        
        Contributing
        ------------
        Please see the `Contribution Guidelines`_.
        
        Attribution
        -----------
        Based on the excellent recipe by `Zoran Isailovski`_, Copyright (c) 2005.
        
        .. _`Contribution Guidelines`: https://github.com/pyeve/events/blob/master/CONTRIBUTING.rst
        .. _LICENSE: https://github.com/pyeve/events/blob/master/LICENSE 
        .. _`Zoran Isailovski`: http://code.activestate.com/recipes/410686/
        
Platform: any
Classifier: Development Status :: 4 - Beta
Classifier: Intended Audience :: Developers
Classifier: License :: OSI Approved :: BSD License
Classifier: Operating System :: OS Independent
Classifier: Programming Language :: Python
Classifier: Programming Language :: Python :: 2
Classifier: Programming Language :: Python :: 2.7
Classifier: Programming Language :: Python :: 3
Classifier: Programming Language :: Python :: 3.4
Classifier: Programming Language :: Python :: 3.5
Classifier: Programming Language :: Python :: 3.7
Classifier: Programming Language :: Python :: 3.8
Classifier: Topic :: Software Development
