Work with positions instead of offset

html/translate.html

@@ -7,6 +7,7 @@
 
 <h2>{% trans "Translate" %}</h2>
 
+<p>{% blocktrans %}Showing string {{ unit.position }} out of {{ total }}.{% endblocktrans %}</p>
 
 {% endblock %}
 

trans/views.py

@@ -31,28 +31,17 @@ def translate(request, project, subproject, lang):
     obj = get_object_or_404(Translation, language__code = lang, subproject__slug = subproject, subproject__project__slug = project)
 
     rqtype = request.REQUEST.get('type', 'all')
-    offset = request.REQUEST.get('offset', '0')
+    pos = request.REQUEST.get('oldpos', '-1')
     try:
-        offset = int(offset)
+        pos = int(pos)
     except:
-        offset = 0
-    units = obj.unit_set.filter_type(rqtype)
-    total = units.count()
-    if offset >= total:
-        offset = total - 1
-    nextoffset = offset + 1
-    if nextoffset >= total:
-        nextoffset = None
-    prevoffset = offset - 1
-    if prevoffset < 0:
-        prevoffset = None
+        pos = -1
+    unit = obj.unit_set.filter_type(rqtype).filter(position__gt = pos)[0]
+    total = obj.unit_set.all().count()
 
     return render_to_response('translate.html', RequestContext(request, {
         'object': obj,
         'title': '%s @ Weblate' % (obj.__unicode__()),
-        'unit': units[offset],
+        'unit': unit,
         'total': total,
-        'offset': offset,
-        'prevoffset': prevoffset,
-        'nextoffset': nextoffset,
     }))