From cb56db0fb3ee2174a48bd1dfd00c9c8e197a19a9 Mon Sep 17 00:00:00 2001
From: bee-keeper <ricbottomley@gmail.com>
Date: Tue, 21 Jun 2016 21:24:47 +0100
Subject: [PATCH] django-filer backend

---
 image_cropping/backends/flr.py | 59 ++++++++++++++++++++++++++++++++++
 1 file changed, 59 insertions(+)
 create mode 100644 image_cropping/backends/flr.py

diff --git a/image_cropping/backends/flr.py b/image_cropping/backends/flr.py
new file mode 100644
index 00000000..52a3a6af
--- /dev/null
+++ b/image_cropping/backends/flr.py
@@ -0,0 +1,59 @@
+"""
+Backend for django-filer
+
+https://github.com/divio/django-filer
+
+Usage: Subsititute FilerImageField for CroppableFilerImageField
+"""
+
+from filer.fields.image import (
+    AdminImageWidget,
+    AdminImageFormField, FilerImageField,
+)
+from filer.models import File
+from easy_thumbnails.files import get_thumbnailer
+from easy_thumbnails.source_generators import pil_image
+
+from ..widgets import CropWidget
+from .base import ImageBackend
+
+
+class FilerCropWidget(AdminImageWidget, CropWidget):
+
+    def render(self, name, value, attrs=None):
+        if value:
+            file_obj = File.objects.get(pk=value)
+            attrs = attrs or {}
+            attrs.update({
+                'class': 'crop-thumb',
+                'data-thumbnail-url':
+                    file_obj.thumbnails['admin_sidebar_preview'],
+                'data-field-name': name,
+                'data-org-width': file_obj.width,
+                'data-org-height': file_obj.height,
+                'style': 'display:none',
+
+            })
+        return super(FilerCropWidget, self).render(name, value, attrs)
+
+
+class CroppableFormField(AdminImageFormField):
+    widget = FilerCropWidget
+
+
+class CroppableFilerImageField(FilerImageField):
+    default_form_class = CroppableFormField
+
+
+class FilerBackend(ImageBackend):
+    version_suffix = 'crop'
+
+    WIDGETS = dict(ImageBackend.WIDGETS)
+    WIDGETS['CroppableFilerImageField'] = FilerCropWidget
+
+    def get_thumbnail_url(self, image_path, thumbnail_options):
+        thumb = get_thumbnailer(image_path)
+        return thumb.get_thumbnail(thumbnail_options).url
+
+    def get_size(self, image):
+        return pil_image(image).size