class Prawn::ImageHandler

ImageHandler provides a way to register image processors with Prawn.

Public Class Methods

Source

# File lib/prawn/image_handler.rb, line 16
def initialize
  @handlers = []
end

@private

Public Instance Methods

find (image_blob)

Source

# File lib/prawn/image_handler.rb, line 52
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

Find an image handler for an image.

@param image_blob [String] @return [Object] @raise [Prawn::Errors::UnsupportedImageType] If no image handler were

found for the image.

Source

# File lib/prawn/image_handler.rb, line 24
def register(handler)
  @handlers.delete(handler)
  @handlers.push(handler)
end

@param handler [Object] @return [void]

Source

# File lib/prawn/image_handler.rb, line 33
def register!(handler)
  @handlers.delete(handler)
  @handlers.unshift(handler)
end

@param handler [Object] @return [void]

unregister (handler)

Source

# File lib/prawn/image_handler.rb, line 42
def unregister(handler)
  @handlers.reject! { |h| h == handler }
end

Unregister an image handler.

@param handler [Object] @return [void]