Class: Diakonos::LineMover

Inherits:
Object show all
Defined in:
lib/diakonos/line-mover.rb

Instance Method Summary collapse

Constructor Details

#initialize(buffer:) ⇒ LineMover

Returns a new instance of LineMover.



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# File 'lib/diakonos/line-mover.rb', line 3

def initialize(buffer:)
  @buffer = buffer
end

Instance Method Details

#move_selected_lines(direction:) ⇒ Object 



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# File 'lib/diakonos/line-mover.rb', line 7

def move_selected_lines(direction:)
  case direction
  when :up
    from_row = start_row-1
    return  if from_row < 0
    to_row = end_row-1
    selection_delta = 0
  when :down
    from_row = end_row
    to_row = start_row
    return  if to_row > @buffer.lines.count - 2
    selection_delta = @buffer.selecting? ? 1 : 0
  end

  @buffer.take_snapshot Buffer::TYPING
  @buffer.lines.insert(
    to_row,
    @buffer.lines.delete_at(from_row)
  )
  if @buffer.selecting?
    @buffer.set_selection to_row+selection_delta, 0, from_row+1+selection_delta, 0
    @buffer.anchor_selection to_row+selection_delta
  end
  @buffer.go_to_line from_row+selection_delta
  @buffer.set_modified
end