def _test_thumbnails_deletion(self, thumbnails_full_paths):
thumbnailer = get_thumbnailer()
for image in self.images:
thumbnailer.delete_thumbnails(image.original)
self._test_thumbnails_not_exist(thumbnails_full_paths)
def _test_thumbnails_deletion(self, thumbnails_full_paths):
thumbnailer = get_thumbnailer()
for image in self.images:
thumbnailer.delete_thumbnails(image.original)
self._test_thumbnails_not_exist(thumbnails_full_paths)
def delete_image_files(sender, instance, **kwargs):
"""
Deletes the original image and created thumbnails.
"""
image_fields = (models.ImageField,)
thumbnailer = get_thumbnailer()
for field in instance._meta.fields:
if isinstance(field, image_fields):
# Make Django return ImageFieldFile instead of ImageField
field_file = getattr(instance, field.name)
thumbnailer.delete_thumbnails(field_file)
def create_thumbnails(self):
thumbnailer = get_thumbnailer()
thumbnails_full_paths = []
for image in self.images:
thumbnail = thumbnailer.generate_thumbnail(image.original, **self.thumbnail_options)
thumbnails_full_paths.append(get_thumbnail_full_path(thumbnail.url))
# Check thumbnails exist in the file system.
for path in thumbnails_full_paths:
assert os.path.isfile(path) # `isfile` returns `True` if path is an existing regular file.
return thumbnails_full_paths
def create_thumbnails(self):
thumbnailer = get_thumbnailer()
thumbnails_full_paths = []
for image in self.images:
thumbnail = thumbnailer.generate_thumbnail(image.original, **self.thumbnail_options)
thumbnails_full_paths.append(get_thumbnail_full_path(thumbnail.url))
# Check thumbnails exist in the file system.
for path in thumbnails_full_paths:
assert os.path.isfile(path) # `isfile` returns `True` if path is an existing regular file.
return thumbnails_full_paths
def __init__(self,
source_field,
image_type=None,
image_processor=None,
do_upscale=False,
settings=settings,
**options):
self.source_field = source_field
self.image_type = image_type
self.image_processor = image_processor or get_thumbnailer(
).generate_thumbnail
self.do_upscale = do_upscale
self.settings = settings or get_settings()
self.options = options
return
def _render(self, context):
source = self.source_var.resolve(context)
options = self.get_thumbnail_options(context)
for key, expr in self.options:
value = self.no_resolve.get(str(expr), expr.resolve(context))
options[key] = value
thumbnailer = get_thumbnailer()
thumbnail = thumbnailer.generate_thumbnail(source, **options)
if self.context_name is None:
return escape(thumbnail.url)
else:
context[self.context_name] = thumbnail
return ''
def render(self, context):
source = self.source_var.resolve(context)
options = {'size': self.size_var.resolve(context)}
for key, expr in self.options:
value = self.no_resolve.get(text_type(expr), expr.resolve(context))
options[key] = value
thumbnailer = get_thumbnailer()
thumbnail = thumbnailer.generate_thumbnail(source, **options)
if self.context_name is None:
return escape(thumbnail.url)
else:
context[self.context_name] = thumbnail
return ''
def get_srcset_image(source,
width,
image_type=None,
image_processor=None,
do_upscale=False,
settings=settings,
**options):
"""Build and return the source set image objects."""
# have to wrap sizes so they pass to thumbnailer as 'widthxheight'.
# this is probably the worst part of the thumbnailers API.
calc_img_dim = lambda source, width: f"{width}x{int((width / source.width) * source.height)}"
# prevent upscaling by default. Filter sizes out that are greater than the
# uploaded source image.
if not do_upscale and width >= source.width:
return
# give the options of passing in a custom image processor.
image_processor = image_processor or get_thumbnailer().generate_thumbnail
return image_processor(
source, **dict({'size': calc_img_dim(source, width)}, **options))
