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Contents
# @provides MotionKit::Parent
module MotionKit
# Simple class that returns data about the parent element
# for use while setting the styles of a child element.
class Parent
attr_reader :element
def initialize(element)
@element = element
end
def frame
try(:frame)
end
def origin
try(:frame, :origin)
end
def size
try(:frame, :size)
end
def x
try(:frame, :origin, :x)
end
def y
try(:frame, :origin, :y)
end
def width
try(:frame, :size, :width)
end
def height
try(:frame, :size, :height)
end
def center_x
width / 2.0 if width
end
def center_y
height / 2.0 if height
end
def center
CGPointMake(center_x, center_y) if width && height
end
protected
# Convenience method that takes a list of method calls and tries
# them end-to-end, returning nil if any fail to respond to that
# method name.
# Very similar to ActiveSupport's `.try` method.
def try(*method_chain)
obj = self.element
method_chain.each do |m|
# We'll break out and return nil if any part of the chain
# doesn't respond properly.
(obj = nil) && break unless obj.respond_to?(m)
obj = obj.send(m)
end
obj
end
end
end
Version data entries
11 entries across 11 versions & 1 rubygems