--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/ztfy/utils/browser/daterange.py	Tue Nov 20 17:51:28 2012 +0100
@@ -0,0 +1,116 @@
+### -*- coding: utf-8 -*- ####################################################
+##############################################################################
+#
+# Copyright (c) 2012 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.
+#
+##############################################################################
+
+
+# import standard packages
+
+# import Zope3 interfaces
+from z3c.form.interfaces import IMultiWidget, IFieldWidget, NO_VALUE
+
+# import local interfaces
+from ztfy.skin.layer import IZTFYBrowserLayer
+from ztfy.utils.schema import IDatesRangeField
+
+# import Zope3 packages
+from z3c.form.browser.widget import HTMLFormElement
+from z3c.form.converter import SequenceDataConverter, FormatterValidationError
+from z3c.form.widget import FieldWidget, Widget
+from zope.component import adapter, adapts
+from zope.interface import implementer, implements
+from zope.i18n.format import DateTimeParseError
+
+# import local packages
+from ztfy.jqueryui import jquery_datetime
+
+
+class IDatesRangeWidget(IMultiWidget):
+    """Dates range widget interface"""
+
+
+class DatesRangeDataConverter(SequenceDataConverter):
+    """Dates range data converter"""
+
+    adapts(IDatesRangeField, IDatesRangeWidget)
+
+    def toWidgetValue(self, value):
+        if value is self.field.missing_value:
+            return (u'', u'')
+        locale = self.widget.request.locale
+        formatter = locale.dates.getFormatter('date', 'short')
+        return (formatter.format(value[0]) if value[0] else None,
+                formatter.format(value[1]) if value[1] else None)
+
+    def toFieldValue(self, value):
+        if not value:
+            return self.field.missing_value
+        try:
+            locale = self.widget.request.locale
+            formatter = locale.dates.getFormatter('date', 'short')
+            return (formatter.parse(value[0]) if value[0] else None,
+                    formatter.parse(value[1]) if value[1] else None)
+        except DateTimeParseError, err:
+            raise FormatterValidationError(err.args[0], value)
+
+
+class DatesRangeWidget(HTMLFormElement, Widget):
+    """Dates range widget"""
+
+    implements(IDatesRangeWidget)
+
+    @property
+    def pattern(self):
+        result = self.request.locale.dates.getFormatter('date', 'short').getPattern()
+        return result.replace('dd', '%d').replace('MM', '%m').replace('yy', '%y')
+
+    @property
+    def begin_id(self):
+        return '%s-begin' % self.id
+
+    @property
+    def begin_name(self):
+        return '%s.begin' % self.name
+
+    @property
+    def begin_date(self):
+        return (self.value[0] or '') if self.value else ''
+
+    @property
+    def end_id(self):
+        return '%s-end' % self.id
+
+    @property
+    def end_name(self):
+        return '%s.end' % self.name
+
+    @property
+    def end_date(self):
+        return (self.value[1] or '') if self.value else ''
+
+    def extract(self, default=NO_VALUE):
+        begin_date = self.request.get(self.begin_name)
+        end_date = self.request.get(self.end_name)
+        return (begin_date, end_date)
+
+    def render(self):
+        result = super(DatesRangeWidget, self).render()
+        if result:
+            jquery_datetime.need()
+        return result
+
+@adapter(IDatesRangeField, IZTFYBrowserLayer)
+@implementer(IFieldWidget)
+def DatesRangeFieldWidgetFactory(field, request):
+    """IDatesRangeField widget factory"""
+    return FieldWidget(field, DatesRangeWidget(request))