36 lines
872 B
Ruby
36 lines
872 B
Ruby
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# A simple event registering/triggering module to mix into classes.
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# Events are stored in the `@events` ivar.
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module Eventable
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# Register a handler for the given event name.
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#
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# obj.on(:foo) { puts "foo was called" }
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#
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# @param [String, Symbol] name event name
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# @return handler
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def on(name, &handler)
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event_table[name] << handler
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handler
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end
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def off(name, handler)
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event_table[name].delete handler
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end
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def event_table
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return @event_table if @event_table
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@event_table = Hash.new { |hash, key| hash[key] = [] }
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end
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# Trigger the given event name and passes all args to each handler
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# for this event.
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#
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# obj.trigger(:foo)
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# obj.trigger(:foo, 1, 2, 3)
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#
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# @param [String, Symbol] name event name to trigger
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def trigger(name, *args)
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event_table[name].each { |handler| handler.call(*args) }
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end
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end
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