2 files changed, 48 insertions, 0 deletions
diff --git a/sublab_project/preview_admin/__init__.py b/sublab_project/preview_admin/__init__.py
new file mode 100644
index 0000000..3d18e8d
--- /dev/null
+++ b/sublab_project/preview_admin/__init__.py
@@ -0,0 +1 @@
+from preview_admin.admin import PreviewAdmin
diff --git a/sublab_project/preview_admin/admin.py b/sublab_project/preview_admin/admin.py
new file mode 100644
index 0000000..6f6f0e2
--- /dev/null
+++ b/sublab_project/preview_admin/admin.py
@@ -0,0 +1,47 @@
+from django.contrib.admin import ModelAdmin
+from django.conf.urls.defaults import patterns, url
+from django.core.urlresolvers import reverse, NoReverseMatch
+from django.shortcuts import render_to_response
+from django.utils.safestring import mark_safe
+
+import logging
+logger = logging.getLogger('preview_admin')
+
+class PreviewAdmin(ModelAdmin):
+    preview_fields = {}
+    def get_urls(self):
+        info = self.model._meta.app_label, self.model._meta.module_name
+
+        urls = super(PreviewAdmin, self).get_urls()
+        myurls = patterns('',
+                url(r'^preview/(.+)/$', self.admin_site.admin_view(self.preview),
+                    name='%s_%s_preview' % info),
+        )
+        return myurls + urls
+
+    def add_preview(self, formfield):
+        render = formfield.widget.render
+
+        def preview_render(name, *args, **kwargs):
+            rendered = render(name, *args, **kwargs)
+
+            info = self.model._meta.app_label, self.model._meta.module_name
+            preview_url = reverse('admin:%s_%s_preview' % info,
+                        args=[name], current_app=self.admin_site.name)
+
+            rendered += '<p><a href="%s">Preview</a></p>' % preview_url
+            return mark_safe(rendered)
+
+        formfield.widget.render = preview_render
+
+    def formfield_for_dbfield(self, db_field, **kwargs):
+        formfield = super(PreviewAdmin, self).formfield_for_dbfield(db_field, **kwargs)
+
+        if db_field.name in self.preview_fields:
+            self.add_preview(formfield)
+
+        return formfield
+
+    def preview(self, request, field):
+        return render_to_response('404.html')
+