apps/sponsors/models.py

   1 # -*- coding: utf-8 -*-
   2 # This file is part of Wolnelektury, licensed under GNU Affero GPLv3 or later.
   3 # Copyright © Fundacja Nowoczesna Polska. See NOTICE for more information.
   4 #
   5 import time
   6 from StringIO import StringIO
   7 from django.db import models
   8 from django.utils.translation import ugettext_lazy as _
   9 from django.template.loader import render_to_string
  10 from PIL import Image
  11
  12 from sorl.thumbnail.fields import ImageWithThumbnailsField
  13 from sponsors.fields import JSONField
  14 from django.core.files.base import ContentFile
  15
  16 THUMB_WIDTH=120
  17 THUMB_HEIGHT=120
  18
  19 class Sponsor(models.Model):
  20     name = models.CharField(_('name'), max_length=120)
  21     _description = models.CharField(_('description'), blank=True, max_length=255)
  22     logo = ImageWithThumbnailsField(
  23         _('logo'),
  24         upload_to='sponsorzy/sponsor/logo',
  25         thumbnail={
  26             'size': (THUMB_WIDTH, THUMB_HEIGHT),
  27             'extension': 'png',
  28             'options': ['pad', 'detail'],
  29         })
  30     url = models.URLField(_('url'), blank=True, verify_exists=False)
  31
  32     def __unicode__(self):
  33         return self.name
  34
  35     def description(self):
  36         if len(self._description):
  37             return self._description
  38         else:
  39             return self.name
  40
  41
  42 class SponsorPage(models.Model):
  43     name = models.CharField(_('name'), max_length=120)
  44     sponsors = JSONField(_('sponsors'), default={})
  45     _html = models.TextField(blank=True, editable=False)
  46     sprite = models.ImageField(upload_to='sponsorzy/sprite', blank=True)
  47
  48     def populated_sponsors(self):
  49         result = []
  50         offset = 0
  51         for column in self.get_sponsors_value():
  52             result_group = {'name': column['name'], 'sponsors': []}
  53             sponsor_objects = Sponsor.objects.in_bulk(column['sponsors'])
  54             for sponsor_pk in column['sponsors']:
  55                 try:
  56                     result_group['sponsors'].append((offset, sponsor_objects[sponsor_pk]))
  57                     offset -= THUMB_HEIGHT
  58                 except KeyError:
  59                     pass
  60             result.append(result_group)
  61         return result
  62
  63     def render_sprite(self):
  64         sponsor_ids = []
  65         for column in self.get_sponsors_value():
  66             sponsor_ids.extend(column['sponsors'])
  67         sponsors = Sponsor.objects.in_bulk(sponsor_ids)
  68         sprite = Image.new('RGBA', (THUMB_WIDTH, len(sponsors)*THUMB_HEIGHT))
  69         for i, sponsor_id in enumerate(sponsor_ids):
  70             simg = Image.open(sponsors[sponsor_id].logo.thumbnail.dest)
  71             sprite.paste(simg, (0, i*THUMB_HEIGHT))
  72         imgstr = StringIO()
  73         sprite.save(imgstr, 'png')
  74
  75         if self.sprite:
  76             self.sprite.delete(save=False)
  77         self.sprite.save('sponsorzy/sprite/%s-%d.png' % (self.name, time.time()), ContentFile(imgstr.getvalue()), save=False)
  78
  79     def html(self):
  80         return self._html
  81     html = property(fget=html)
  82
  83     def save(self, *args, **kwargs):
  84         self.render_sprite()
  85         self._html = render_to_string('sponsors/page.html', {
  86             'sponsors': self.populated_sponsors(),
  87             'page': self
  88         })
  89         return super(SponsorPage, self).save(*args, **kwargs)
  90
  91     def __unicode__(self):
  92         return self.name
  93