Merge pull request #65 from collective/alecm-purge-cache-on-crop

Implement proxy cache purging when updating image crops.

CHANGES.rst

@@ -4,6 +4,9 @@ Changelog
 1.3 (unreleased)
 ----------------
 
+- Purge proxy caches if needed on crop.
+  [alecm]
+
 - Fix issue with crops disappearing for non-blob images (e.g. ATNewsItem images)
   [alecm]
 

setup.py

@@ -55,6 +55,7 @@
         'zope.interface',
         'zope.lifecycleevent',
         'zope.schema',
+        'z3c.caching',
     ],
     extras_require={
         'test': [

src/plone/app/imagecropping/at.py

@@ -16,7 +16,6 @@
 from zope.annotation.interfaces import IAnnotations
 from zope.component import adapter
 from zope.interface import implementer
-from zope.interface.declarations import providedBy
 from zope.publisher.interfaces import IRequest
 import time
 

src/plone/app/imagecropping/browser/crop.py

@@ -5,7 +5,9 @@
 from plone.app.imagecropping import PAI_STORAGE_KEY
 from plone.app.imagecropping.interfaces import IImageCroppingUtils
 from plone.scale.storage import AnnotationStorage
+from z3c.caching.purge import Purge
 from zope.annotation.interfaces import IAnnotations
+from zope.event import notify
 
 import PIL.Image
 
@@ -42,6 +44,9 @@ def _crop(self, fieldname, scale, box):
         # store crop information in annotations
         self._store(fieldname, scale, box)
 
+        # Purge caches if needed
+        notify(Purge(self.context))
+
     @property
     def _storage(self):
         return IAnnotations(self.context).setdefault(