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module Vedeu
# Change coordinates into an escape sequence to set the cursor position.
# Also used as the basis of an Offset.
#
# @api private
class Position < Array
# Initializes a new instance of Position.
#
# @param y [Fixnum]
# @param x [Fixnum]
# @return [Position]
def initialize(y = 0, x = 0)
super([y, x])
end
# Returns an escape sequence to position the cursor. When passed a block,
# will position the cursor, yield and return the original position.
#
# @param block [Proc]
# @return [String]
def to_s(&block)
if block_given?
[ sequence, yield, sequence ].join
else
sequence
end
end
private
# Returns the escape sequence to reposition the cursors at the coordinates
# specified by x and y. If either of these values are 0, then we use 1,
# as ANSI terminals do not have a 0, 0 coordinate.
#
# @return [String]
def sequence
["\e[", (y == 0 ? 1 : y), ';', (x == 0 ? 1 : x), 'H'].join
end
# Returns the y coordinate. Can be 0 as this class may also be used as an
# Offset.
#
# @return [Fixnum]
def y
(first == nil) ? 0 : first
end
# Returns the x coordinate. Can be 0 as this class may also be used as an
# Offset.
#
# @return [Fixnum]
def x
(last == nil) ? 0 : last
end
end # Position
end # Vedeu
Version data entries
9 entries across 9 versions & 1 rubygems