Class: Gitlab::RelativePositioning::Mover

Inherits:
Object
  • Object
show all
Defined in:
lib/gitlab/relative_positioning/mover.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(start, range) ⇒ Mover

Returns a new instance of Mover.



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# File 'lib/gitlab/relative_positioning/mover.rb', line 8

def initialize(start, range)
  @range = range
  @start_position = start
end

Instance Attribute Details

#range ⇒ Object (readonly)

Returns the value of attribute range.



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# File 'lib/gitlab/relative_positioning/mover.rb', line 6

def range
  @range
end

#start_position ⇒ Object (readonly)

Returns the value of attribute start_position.



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# File 'lib/gitlab/relative_positioning/mover.rb', line 6

def start_position
  @start_position
end

Instance Method Details

#context(object, ignoring: nil) ⇒ Object 



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# File 'lib/gitlab/relative_positioning/mover.rb', line 48

def context(object, ignoring: nil)
  return unless object

  ItemContext.new(object, range, ignoring: ignoring)
end

#move(object, first, last) ⇒ Object

Raises:

  • (ArgumentError) 


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# File 'lib/gitlab/relative_positioning/mover.rb', line 27

def move(object, first, last)
  raise ArgumentError, 'object is required' unless object

  lhs = context(first, ignoring: object)
  rhs = context(last, ignoring: object)
  focus = context(object)
  range = RelativePositioning.range(lhs, rhs)

  if range.cover?(focus)
    # Moving a object already within a range is a no-op
  elsif range.open_on_left?
    move_to_range_start(focus, range.rhs.relative_position)
  elsif range.open_on_right?
    move_to_range_end(focus, range.lhs.relative_position)
  else
    pos_left, pos_right = create_space_between(range)
    desired_position = position_between(pos_left, pos_right)
    focus.place_at_position(desired_position, range.lhs)
  end
end

#move_to_end(object) ⇒ Object 



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# File 'lib/gitlab/relative_positioning/mover.rb', line 13

def move_to_end(object)
  focus = context(object, ignoring: object)
  max_pos = focus.max_relative_position

  move_to_range_end(focus, max_pos)
end

#move_to_start(object) ⇒ Object 



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# File 'lib/gitlab/relative_positioning/mover.rb', line 20

def move_to_start(object)
  focus = context(object, ignoring: object)
  min_pos = focus.min_relative_position

  move_to_range_start(focus, min_pos)
end