mirror of
https://github.com/Hopiu/django-imagekit.git
synced 2026-03-17 05:40:25 +00:00
86 lines
3.3 KiB
Python
86 lines
3.3 KiB
Python
from django.db import models
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from .files import ProcessedImageFieldFile
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from .utils import ImageSpecFileDescriptor
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from ... import specs
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from ...specs import SpecHost
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from ...specs.sourcegroups import ImageFieldSourceGroup
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class SpecHostField(SpecHost):
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def set_spec_id(self, cls, name):
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# Generate a spec_id to register the spec with. The default spec id is
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# "<app>:<model>_<field>"
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if not getattr(self, 'spec_id', None):
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spec_id = (u'%s:%s_%s' % (cls._meta.app_label,
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cls._meta.object_name, name)).lower()
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# Register the spec with the id. This allows specs to be overridden
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# later, from outside of the model definition.
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super(SpecHostField, self).set_spec_id(spec_id)
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class ImageSpecField(SpecHostField):
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"""
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The heart and soul of the ImageKit library, ImageSpecField allows you to add
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variants of uploaded images to your models.
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"""
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def __init__(self, processors=None, format=None, options=None,
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image_field=None, storage=None, autoconvert=None,
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image_cache_backend=None, image_cache_strategy=None, spec=None,
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id=None):
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SpecHost.__init__(self, processors=processors, format=format,
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options=options, storage=storage, autoconvert=autoconvert,
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image_cache_backend=image_cache_backend,
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image_cache_strategy=image_cache_strategy, spec=spec,
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spec_id=id)
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self.image_field = image_field
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def contribute_to_class(self, cls, name):
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setattr(cls, name, ImageSpecFileDescriptor(self, name))
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self.set_spec_id(cls, name)
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# Add the model and field as a source for this spec id
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specs.registry.add_sources(self.spec_id,
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[ImageFieldSourceGroup(cls, self.image_field)])
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class ProcessedImageField(models.ImageField, SpecHostField):
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"""
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ProcessedImageField is an ImageField that runs processors on the uploaded
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image *before* saving it to storage. This is in contrast to specs, which
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maintain the original. Useful for coercing fileformats or keeping images
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within a reasonable size.
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"""
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attr_class = ProcessedImageFieldFile
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def __init__(self, processors=None, format=None, options=None,
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verbose_name=None, name=None, width_field=None, height_field=None,
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autoconvert=True, spec=None, spec_id=None, **kwargs):
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"""
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The ProcessedImageField constructor accepts all of the arguments that
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the :class:`django.db.models.ImageField` constructor accepts, as well
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as the ``processors``, ``format``, and ``options`` arguments of
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:class:`imagekit.models.ImageSpecField`.
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"""
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SpecHost.__init__(self, processors=processors, format=format,
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options=options, autoconvert=autoconvert, spec=spec,
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spec_id=spec_id)
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models.ImageField.__init__(self, verbose_name, name, width_field,
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height_field, **kwargs)
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def contribute_to_class(self, cls, name):
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self.set_spec_id(cls, name)
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return super(ProcessedImageField, self).contribute_to_class(cls, name)
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try:
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from south.modelsinspector import add_introspection_rules
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except ImportError:
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pass
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else:
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add_introspection_rules([], [r'^imagekit\.models\.fields\.ProcessedImageField$'])
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