--- a/src/pyams_portal/interfaces/__init__.py	Thu Jun 14 17:35:36 2018 +0200
+++ b/src/pyams_portal/interfaces/__init__.py	Fri Jun 15 14:05:17 2018 +0200
@@ -56,7 +56,7 @@
 
     toolbar_css_class = Attribute("Portlet toolbar CSS class")
 
-    settings_class = Attribute("Portlet settings class")
+    settings_factory = Attribute("Portlet settings factory")
 
 
 class IPortletAddingInfo(Interface):

--- a/src/pyams_portal/portlet.py	Thu Jun 14 17:35:36 2018 +0200
+++ b/src/pyams_portal/portlet.py	Fri Jun 15 14:05:17 2018 +0200
@@ -19,6 +19,8 @@
 
 import venusian
 
+from inspect import isclass
+
 # import interfaces
 from pyams_form.interfaces.form import IFormContextPermissionChecker
 from pyams_portal.interfaces import IPortlet, IPortletSettings, IPortletConfiguration, IPortletPreviewer, \
@@ -30,6 +32,7 @@
 from persistent import Persistent
 from persistent.mapping import PersistentMapping
 from pyams_utils.adapter import adapter_config, ContextAdapter, get_adapter_weight, get_annotation_adapter
+from pyams_utils.factory import get_object_factory
 from pyams_utils.request import check_request
 from pyams_utils.vocabulary import vocabulary_config
 from pyams_viewlet.viewlet import ViewContentProvider
@@ -38,7 +41,7 @@
 from pyramid.threadlocal import get_current_registry
 from zope.container.contained import Contained
 from zope.copy import clone
-from zope.interface import implementer, alsoProvides, noLongerProvides
+from zope.interface import implementer, alsoProvides, noLongerProvides, Interface
 from zope.lifecycleevent import ObjectCreatedEvent
 from zope.location import locate
 from zope.schema.fieldproperty import FieldProperty
@@ -58,7 +61,7 @@
     toolbar_image = None
     toolbar_css_class = 'fa fa-fw fa-2x fa-edit'
 
-    settings_class = None
+    settings_factory = None
 
 
 class portlet_config(object):
@@ -206,7 +209,10 @@
 
     This class is supposed to be sub-classed by all custom portlet subclasses to
     store their configuration settings.
-    Each portlet sub-class must define it's settings class in it's "settings_class" attribute.
+
+    Each portlet sub-class must define it's settings factory in it's "settings_factory" attribute.
+    Given factory can be a function, a class or an interface; in this last case, implementation
+    is looking for default object factory registered for this interface.
     """
 
     _renderer = FieldProperty(IPortletSettings['renderer'])
@@ -278,7 +284,11 @@
 
     def __init__(self, portlet):
         self.portlet_name = portlet.name
-        self._settings = portlet.settings_class(self)
+        factory = portlet.settings_factory
+        if isclass(factory) and issubclass(factory, Interface):
+            factory = get_object_factory(factory)
+        assert factory is not None, "Missing portlet settings factory"
+        self._settings = factory(self)
 
     @property
     def can_inherit(self):

--- a/src/pyams_portal/portlets/html/__init__.py	Thu Jun 14 17:35:36 2018 +0200
+++ b/src/pyams_portal/portlets/html/__init__.py	Fri Jun 15 14:05:17 2018 +0200
@@ -21,6 +21,7 @@
 
 # import packages
 from pyams_portal.portlet import PortletSettings, portlet_config, Portlet
+from pyams_utils.factory import factory_config
 from zope.interface import implementer
 from zope.schema.fieldproperty import FieldProperty
 
@@ -35,6 +36,7 @@
 
 
 @implementer(IRawPortletSettings)
+@factory_config(provided=IRawPortletSettings)
 class RawPortletSettings(PortletSettings):
     """Raw HTML code portlet settings"""
 
@@ -50,7 +52,7 @@
 
     toolbar_css_class = 'fa fa-fw fa-2x fa-code'
 
-    settings_class = RawPortletSettings
+    settings_factory = IRawPortletSettings
 
 
 #
@@ -61,6 +63,7 @@
 
 
 @implementer(IHTMLPortletSettings)
+@factory_config(provided=IHTMLPortletSettings)
 class HTMLPortletSettings(PortletSettings):
     """Rich text portlet settings"""
 
@@ -74,6 +77,6 @@
     name = HTML_PORTLET_NAME
     label = _("Rich text")
 
-    toolbar_css_class = 'fa fa-fw fa-2x fa-html5'
+    toolbar_css_class = 'fa fa-fw fa-2x fa-font'
 
-    settings_class = HTMLPortletSettings
+    settings_factory = IHTMLPortletSettings

--- a/src/pyams_portal/portlets/image/__init__.py	Thu Jun 14 17:35:36 2018 +0200
+++ b/src/pyams_portal/portlets/image/__init__.py	Fri Jun 15 14:05:17 2018 +0200
@@ -23,6 +23,7 @@
 # import packages
 from pyams_file.property import FileProperty
 from pyams_portal.portlet import portlet_config, Portlet, PortletSettings
+from pyams_utils.factory import factory_config
 from zope.interface import implementer, alsoProvides
 
 from pyams_portal import _
@@ -32,6 +33,7 @@
 
 
 @implementer(IImagePortletSettings)
+@factory_config(provided=IImagePortletSettings)
 class ImagePortletSettings(PortletSettings):
     """Image portlet settings"""
 
@@ -58,4 +60,4 @@
     toolbar_image = None
     toolbar_css_class = 'fa fa-fw fa-2x fa-picture-o'
 
-    settings_class = ImagePortletSettings
+    settings_factory = IImagePortletSettings