Contents

# ImageHandler provides a way to register image processors with Prawn
#
# Contributed by Evan Sharp in November 2013.
#
# This is free software. Please see the LICENSE and COPYING files for details.

module Prawn
  # @group Extension API
  
  def self.image_handler
    @image_handler ||= ImageHandler.new
  end

  class ImageHandler
    def initialize
      @handlers = []
    end

    def register(handler)
      @handlers.delete(handler)
      @handlers.push handler
    end

    def register!(handler)
      @handlers.delete(handler)
      @handlers.unshift handler
    end

    def unregister(handler)
      @handlers.reject!{ |h| h == handler }
    end

    def find(image_blob)
      handler = @handlers.find{ |h| h.can_render? image_blob }

      return handler if handler

      raise Prawn::Errors::UnsupportedImageType,
            "image file is an unrecognised format"
    end
  end
end

Version data entries

1 entries across 1 versions & 1 rubygems

Version	Path
prawn-1.0.0	lib/prawn/image_handler.rb