Created
April 7, 2010 19:22
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| module Callbacks | |
| @@callbacks = {} | |
| def has_callback_hook(name) | |
| @@callbacks[name] = [] | |
| class_eval <<-CLASS | |
| def #{name}_add block | |
| @callbacks[#{name}] << block | |
| end | |
| def #{name} | |
| @callbacks[#{name}].each do |block| | |
| block.call self | |
| end | |
| end | |
| CLASS | |
| end | |
| end |
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| require 'callbacks' | |
| class TestingCallbacks | |
| extend Callbacks | |
| has_callback_hook :before_foo | |
| has_callback_hook :after_foo | |
| attr_accessor :bar | |
| def initialize | |
| self.bar = "baz" | |
| end | |
| def foo | |
| self.before_foo | |
| puts self.bar | |
| self.after_foo | |
| end | |
| end |
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| require 'testing_callbacks' | |
| test = TestingCallbacks.new | |
| test.before_foo_add lambda { |t| t.bar = "Hello!" } | |
| test.foo |
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