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from django.db import models
from django.template.defaultfilters import slugify
from PIL import Image
from PIL.Image import core as _imaging
from cStringIO import StringIO
from django.core.files.uploadedfile import SimpleUploadedFile, UploadedFile
from django.core.files.storage import FileSystemStorage
import os
from settings import THUMBNAIL_SIZE, MEDIA_ROOT
from django.urls import reverse
# Taken from django snippet 976
class OverwriteStorage(FileSystemStorage):
def get_available_name(self, name, max_length=None):
"""Returns a filename that's free on the target storage system, and
available for new content to be written to."""
# If the filename already exists, remove it as if it was a true file
# system
if self.exists(name):
os.remove(os.path.join(MEDIA_ROOT, name))
return name
class Category(models.Model):
name = models.CharField(max_length=255)
slug = models.SlugField(max_length=255, unique=True, blank=True)
def save(self, *args, **kwargs):
if not self.slug:
self.slug = slugify(self.name)
return super(Category, self).save(*args, **kwargs)
def get_absolute_url(self):
return reverse('wlscreens_category', kwargs={'category_slug': self.slug})
def __unicode__(self):
return u"%s" % self.name
def screenshot_path(instance, filename):
return 'wlscreens/screens/%s/%s.%s' % (
instance.category, instance.name, filename.rsplit('.', 1)[-1].lower()
)
def thumbnail_path(instance, filename):
return 'wlscreens/thumbs/%s/%s.png' % (
instance.category, instance.name)
class Screenshot(models.Model):
name = models.CharField(max_length=255)
screenshot = models.ImageField(
upload_to=screenshot_path,
storage=OverwriteStorage(),
)
thumbnail = models.ImageField(
upload_to=thumbnail_path,
editable=False,
storage=OverwriteStorage(),
)
comment = models.TextField(null=True, blank=True)
category = models.ForeignKey(Category, related_name='screenshots')
class Meta:
unique_together = ('name', 'category')
def save(self, *args, **kwargs):
# Open original screenshot which we want to thumbnail using PIL's Image
# object
image = Image.open(self.screenshot)
# Convert to RGB if necessary
if image.mode not in ('L', 'RGB'):
image = image.convert('RGB')
image.thumbnail(THUMBNAIL_SIZE, Image.ANTIALIAS)
# Save the thumbnail
temp_handle = StringIO()
image.save(temp_handle, 'png')
temp_handle.seek(0)
# Save to the thumbnail field
suf = SimpleUploadedFile(os.path.split(self.screenshot.name)[-1],
temp_handle.read(), content_type='image/png')
self.thumbnail.save(suf.name + '.png', suf, save=False)
# Save this photo instance
super(Screenshot, self).save(*args, **kwargs)
def __unicode__(self):
return u"%s:%s" % (self.category.name, self.name)
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