Add new ImagePathDataType datatype and use it in slide edit

datatypes.py

@@ -16,10 +16,12 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 # Import from itools
-from itools.datatypes import Integer, Enumerate, String
+from itools.datatypes import Integer, Enumerate, String, PathDataType
+from itools.uri import get_reference
 from itools.web import get_context
 
 # Import from ikaaro
+from ikaaro.file import Image
 from ikaaro.registry import get_document_types
 
 
@@ -104,3 +106,20 @@ def get_options(cls):
 
         options.sort(key=lambda x: x['value'])
         return options
+
+
+
+class ImagePathDataType(PathDataType):
+
+    @staticmethod
+    def is_valid(value):
+        here = get_context().resource
+        try:
+            ref = get_reference(value)
+            if not ref.scheme:
+                resource = here.get_resource(ref.path, soft=True)
+                if resource and isinstance(resource, Image):
+                    return True
+        except Exception, e:
+            return False
+        return False

slides.py

@@ -40,7 +40,7 @@
 from ikaaro.webpage import WebPage
 
 # Import from itws
-from datatypes import PositiveIntegerNotNull
+from datatypes import PositiveIntegerNotNull, ImagePathDataType
 from resources import ManageViewAware
 from slides_views import SlideShow_Edit, Slide_Edit, Tag_SlideView, Slide_View
 from slides_views import SlideShow_ManageView, SlideTemplateType
@@ -64,7 +64,7 @@ def get_metadata_schema(cls):
                            state=String(default='public'),
                            long_title=Unicode,
                            # Image of the slide
-                           image=String,
+                           image=ImagePathDataType,
                            # Slide template type
                            template_type=SlideTemplateType(default=''),
                            # Slide title href
@@ -205,7 +205,7 @@ def get_metadata_schema(cls):
         return merge_dicts(ResourcesOrderedContainer.get_metadata_schema(),
                            long_title=Unicode,
                            # Image of the slideshow
-                           image=String,
+                           image=ImagePathDataType,
                            # TOC width
                            toc_nb_col=PositiveIntegerNotNull(default=2),
                            # Slide template type

slides_views.py

@@ -40,7 +40,7 @@
 from ikaaro.webpage import HTMLEditView
 
 # Import from itws
-from datatypes import PositiveIntegerNotNull
+from datatypes import PositiveIntegerNotNull, ImagePathDataType
 from tags import TagsAware_Edit, TagItem_View
 from views import ProxyContainerNewInstance
 
@@ -100,7 +100,8 @@ def get_schema(self, resource, context):
         return merge_dicts(HTMLEditView.get_schema(self, resource, context),
                            TagsAware_Edit.get_schema(self, resource, context),
                            long_title=Unicode, href=String,
-                           image=String, template_type=SlideTemplateType)
+                           image=ImagePathDataType,
+                           template_type=SlideTemplateType)
 
 
     def get_widgets(self, resource, context):
@@ -136,9 +137,7 @@ def action(self, resource, context, form):
         long_title = form['long_title']
         resource.set_property('long_title', long_title, language=language)
         # Image to appear on slide view
-        image = form['image']
-        if image:
-            resource.set_property('image', image)
+        resource.set_property('image', form['image'])
         href = form['href']
         if href:
             resource.set_property('href', href)
@@ -152,7 +151,8 @@ def action(self, resource, context, form):
 class SlideShow_Edit(DBResource_Edit):
 
     schema = merge_dicts(DBResource_Edit.schema, long_title=Unicode,
-                         image=String, toc_nb_col=PositiveIntegerNotNull,
+                         image=ImagePathDataType,
+                         toc_nb_col=PositiveIntegerNotNull,
                          template_type=SlideTemplateType)
 
     widgets = [title_widget, TextWidget('long_title', title=MSG(u'Long title'),
@@ -179,9 +179,7 @@ def action(self, resource, context, form):
         long_title = form['long_title']
         resource.set_property('long_title', long_title, language=language)
         # Image to appear on slide view
-        image = form['image']
-        if image:
-            resource.set_property('image', image)
+        resource.set_property('image', form['image'])
         # Toc width
         resource.set_property('toc_nb_col', form['toc_nb_col'])
         # Template layout