--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/pyams_content/component/keynumber/interfaces.py	Tue Nov 06 14:40:22 2018 +0100
@@ -0,0 +1,97 @@
+#
+# Copyright (c) 2008-2018 Thierry Florac <tflorac AT ulthar.net>
+# All Rights Reserved.
+#
+# This software is subject to the provisions of the Zope Public License,
+# Version 2.1 (ZPL).  A copy of the ZPL should accompany this distribution.
+# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
+# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
+# FOR A PARTICULAR PURPOSE.
+#
+
+__docformat__ = 'restructuredtext'
+
+
+# import standard library
+
+# import interfaces
+from pyams_content.component.paragraph.interfaces import IBaseParagraph
+from pyams_content.interfaces.container import IOrderedContainer
+from zope.annotation.interfaces import IAttributeAnnotatable
+
+# import packages
+from pyams_i18n.schema import I18nTextLineField
+from zope.container.constraints import containers, contains
+from zope.interface import Interface
+from zope.schema import Bool, TextLine, Choice
+
+from pyams_content import _
+
+
+KEYNUMBER_CONTAINER_KEY = 'pyams_content.keynumbers'
+
+
+class IKeyNumber(IAttributeAnnotatable):
+    """Base key number interface"""
+
+    containers('.IKeyNumberContainer')
+
+    visible = Bool(title=_("Visible?"),
+                   description=_("Is this key number visible in front-office?"),
+                   required=True,
+                   default=True)
+
+    label = I18nTextLineField(title=_('key-number-label', default="Header"),
+                              description=_("Small text to be displayed above number (according to selected "
+                                            "renderer)"),
+                              required=False)
+
+    number = TextLine(title=_("Number"),
+                      description=_("Key number value"),
+                      required=True)
+
+    unit = I18nTextLineField(title=_('key-number-unit', default="Unit"),
+                             description=_("Displayed unit"),
+                             required=False)
+
+    text = I18nTextLineField(title=_("Associated text"),
+                             description=_("The way this text will be rendered depends on presentation template"),
+                             required=False)
+
+
+KEYNUMBER_HIDDEN_FIELDS = ('__parent__', '__name__', 'visible')
+
+
+class IKeyNumberContainer(IOrderedContainer):
+    """Key numbers container interface"""
+
+    contains(IKeyNumber)
+
+    def append(self, value, notify=True):
+        """Append given key number to container"""
+
+    def get_visible_items(self):
+        """Get list of visible key numbers"""
+
+
+class IKeyNumberContainerTarget(Interface):
+    """Key numbers container target interface"""
+
+
+KEYNUMBER_PARAGRAPH_TYPE = 'KeyNumbers'
+KEYNUMBER_PARAGRAPH_NAME = _("Key numbers")
+KEYNUMBER_PARAGRAPH_RENDERERS = 'PyAMS.keynumbers.renderers'
+
+
+#
+# KeyNumber paragraph
+#
+
+class IKeyNumberParagraph(IKeyNumberContainerTarget, IBaseParagraph):
+    """Key numbers paragraph interface"""
+
+    renderer = Choice(title=_("Key numbers template"),
+                      description=_("Presentation template used for key numbers"),
+                      vocabulary=KEYNUMBER_PARAGRAPH_RENDERERS,
+                      default='default')