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Versions: 21
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Contents
module Ruco
class History
attr_accessor :timeout
def initialize(options)
@options = options
@stack = [@options.delete(:state)]
@timeout = options.delete(:timeout) || 0
timeout!
@position = 0
end
def state
@stack[@position]
end
def add(state)
return unless tracked_field_changes?(state)
remove_undone_states
if merge_timeout?
@position += 1
@last_merge = Time.now.to_f
end
@stack[@position] = state
limit_stack
end
def undo
timeout!
@position = [@position - 1, 0].max
end
def redo
timeout!
@position = [@position + 1, @stack.size - 1].min
end
private
def remove_undone_states
@stack.slice!(@position + 1, 9999999)
end
def tracked_field_changes?(data)
@options[:track].any? do |field|
state[field] != data[field]
end
end
def limit_stack
to_remove = @stack.size - @options[:entries]
return if to_remove < 1
@stack.slice!(0, to_remove)
@position -= to_remove
end
def timeout!
@last_merge = Time.now.to_f - @timeout
end
def merge_timeout?
(Time.now.to_f - @last_merge) > @timeout
end
end
end
Version data entries
21 entries across 21 versions & 1 rubygems