Class: RubyPicasa::Base

Inherits:
Objectify::DocumentParser
  • Object
show all
Defined in:
lib/ruby_picasa/types.rb

Overview

Note that in all defined classes I’m ignoring values I don’t happen to need or know about. Please do add support for the ones I’ve missed. Be sure to declare which namespaces are supported with the namespaces method. Any elements defined in other namespaces are automatically ignored.

Base class for User, Photo and Album types, not used independently.

attribute :id, 'gphoto:id'
attribute :feed_id, 'id'
attributes :updated, :title

has_many :links, Objectify::Atom::Link, 'link'
has_one :content, PhotoUrl, 'media:content'
has_many :thumbnails, ThumbnailUrl, 'media:thumbnail'
has_one :author, Objectify::Atom::Author, 'author'

Direct Known Subclasses

Album, Photo, User

Instance Method Summary collapse

Instance Method Details

#feed(options = {}) ⇒ Object

Retrieves the data feed at the url of the current record.



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# File 'lib/ruby_picasa/types.rb', line 68

def feed(options = {})
  session.get_url(link('http://schemas.google.com/g/2005#feed').href, options)
end

#link(rel) ⇒ Object

Return the link object with a matching rel attribute value. rel can be either a fully matching string or a regular expression.



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# File 'lib/ruby_picasa/types.rb', line 50

def link(rel)
  links.find { |l| rel === l.rel }
end

#next ⇒ Object

If the results are paginated, retrieve the next page.



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# File 'lib/ruby_picasa/types.rb', line 73

def next
  if link = link('next')
    session.get_url(link.href)
  end
end

#previous ⇒ Object

If the results are paginated, retrieve the previous page.



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# File 'lib/ruby_picasa/types.rb', line 80

def previous
  if link = link('previous')
    session.get_url(link.href)
  end
end

#session ⇒ Object

Should return the Picasa instance that retrieved this data.



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# File 'lib/ruby_picasa/types.rb', line 59

def session
  if @session
    @session
  else
    @session = parent.session if parent
  end
end

#session=(session) ⇒ Object 



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# File 'lib/ruby_picasa/types.rb', line 54

def session=(session)
  @session = session
end

#tb(new_size, crop = false) ⇒ Object

convert a thumbnail from a size to another, example: tb(160) converts this thumbnail url: into this one with new size: the thumb does not need to exist on the xml



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# File 'lib/ruby_picasa/types.rb', line 151

def tb(new_size, crop = false)
    crop = crop ? "-c" : ""
    parts = thumbnails.first.url.split "/"
    parts[-2] = "s" + new_size.to_s + crop
    parts.join "/"
end

#thumbnail(thumb_name) ⇒ Object

See url for possible image sizes

Raises:



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# File 'lib/ruby_picasa/types.rb', line 132

def thumbnail(thumb_name)
  raise PicasaError, 'Invalid thumbnail size' unless Photo::VALID.include?(thumb_name.to_s)
  thumb = thumbnails.find { |t| t.thumb_name == thumb_name }
  if thumb
    thumb
  elsif session
    f = feed(:thumbsize => thumb_name)
    if f
      f.thumbnails.first
    end
  end
end

#url(thumb_name = nil, options = nil) ⇒ Object

Thumbnail names are by image width in pixels. Sizes up to 160 may be either cropped (square) or uncropped:

cropped:        32c, 48c, 64c, 72c, 144c, 160c
uncropped:      32u, 48u, 64u, 72u, 144u, 160u

The rest of the image sizes should be specified by the desired width alone. Widths up to 800px may be embedded on a webpage:

embeddable:     200, 288, 320, 400, 512, 576, 640, 720, 800
not embeddable: 912, 1024, 1152, 1280, 1440, 1600

if a options is set to true or a hash is given, the width and height of the image will be added to the hash and returned. Useful for passing to the rails image_tag helper as follows:

image_tag(*image.url('72c', { :class => 'thumb' }))

which results in:

<img href="..." class="thumb" width="72" height="72">



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# File 'lib/ruby_picasa/types.rb', line 108

def url(thumb_name = nil, options = nil)
  url = nil
  if thumb_name.is_a? Hash
    options = thumb_name
    thumb_name = nil
  end
  options = {} if options and not options.is_a? Hash
  if thumb_name
    if thumb = thumbnail(thumb_name)
      url = thumb.url
      options = { :width => thumb.width, :height => thumb.height }.merge(options) if options
    end
  else
    url = content.url
    options = { :width => content.width, :height => content.height }.merge(options) if options
  end
  if options
    [url, options]
  else
    url
  end
end