Module: MotionPrime::FrameCalculatorMixin

Included in:
DrawElement, DrawSectionMixin, ViewStyler
Defined in:
motion-prime/views/_frame_calculator_mixin.rb

Instance Method Summary collapse

Instance Method Details

#calculate_frame_for(parent_bounds, options) ⇒ Object 



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# File 'motion-prime/views/_frame_calculator_mixin.rb', line 3

def calculate_frame_for(parent_bounds, options)
  width   = options[:width]
  height  = options[:height]
  top     = options[:top]
  right   = options[:right]
  bottom  = options[:bottom]
  left    = options[:left]

  value_type = options[:value_type].to_s # absolute/relative

  if options[:height_to_fit].present? && height.nil? && (top.nil? || bottom.nil?)
    height = options[:height_to_fit]
  end

  return parent_bounds if width.nil? && height.nil? && right.nil? && bottom.nil?
  frame = CGRectMake(0,0,0,0)

  max_width = parent_bounds.size.width
  max_height = parent_bounds.size.height
  temp_width = width || 0.0
  temp_height = height || 0.0

  if left && left > 0 && left <= 1 && value_type != 'absolute' && left.is_a?(Float)
    left = (max_width * left).round(2)
  end

  if right && right > 0 && right <= 1 && value_type != 'absolute' && right.is_a?(Float)
    right = (max_width * right).round(2)
  end

  if top && top > 0 && top <= 1 && value_type != 'absolute' && top.is_a?(Float)
    top = (max_height * top).round(2)
  end

  if bottom && bottom > 0 && bottom <= 1 && value_type != 'absolute' && bottom.is_a?(Float)
    bottom = (max_height * bottom).round(2)
  end

  # calculate left and right if width is relative, e.g 0.7
  if width && width > 0 && width <= 1 && value_type != 'absolute' && width.is_a?(Float)
    if right.nil?
      left ||= 0
      right = (max_width - max_width * width - left).round(2)
    else
      left = (max_width - max_width * width - right).round(2)
    end
    width = (max_width * width).round(2)
  end

  # calculate top and bottom if height is relative, e.g 0.7
  if height && height > 0 && height <= 1 && value_type != 'absolute' && height.is_a?(Float)
    if bottom.nil?
      top ||= 0
      bottom = (max_height - max_height * height - top).round(2)
    else
      top = (max_height - max_height * height - bottom).round(2)
    end
    height = (max_height * height).round(2)
  end

  if !left.nil? && !right.nil?
    frame.origin.x = left
    if options[:height_to_fit].nil? && width.nil?
      width = max_width - left - right
    end
  elsif !right.nil?
    frame.origin.x = max_width - temp_width - right
  elsif !left.nil?
    frame.origin.x = left
  else
    frame.origin.x = max_width / 2 - temp_width / 2
  end
  frame.size.width = width || 0.0

  if !top.nil? && !bottom.nil?
    frame.origin.y = top
    if options[:height_to_fit].nil? && height.nil?
      height = max_height - top - bottom
    end
  elsif !bottom.nil?
    frame.origin.y = max_height - temp_height - bottom
  elsif !top.nil?
    frame.origin.y = top
  else
    frame.origin.y = max_height / 2 - temp_height / 2
  end
  frame.size.height = height || 0.0

  frame
rescue => e
  Prime.logger.error "can't calculate frame in #{self.class.name}. #{e}"
  CGRectMake(0,0,0,0)
end