# File lib/sugar-high/properties.rb, line 37 def is(test) lambda {|val| test === val } end
def property(sym, &predicate)
# File lib/sugar-high/properties.rb, line 14 def property(sym, predicate=nil) define_method(sym) do instance_variable_get("@#{sym}") end define_method("#{sym}=") do |arg| return if !predicate.call(arg) if predicate instance_variable_set("@#{sym}", arg) fire_event_for(sym, arg) end define_method("add_#{sym}_listener") do |x| @listener ||= {} @listener[sym] ||= [] @listener[sym] << x end define_method("remove_#{sym}_listener") do |x| return if !@listener[sym] @listener[sym].delete_at(x) end end
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