Allow optional row grid title for master view

tailbone/templates/master/view.mako

@@ -104,6 +104,9 @@
   % if master.has_rows:
       % if use_buefy:
           <br />
+          % if rows_title:
+              <h4 class="block is-size-4">${rows_title}</h4>
+          % endif
           <tailbone-grid ref="rowGrid" id="rowGrid"></tailbone-grid>
       % else:
           ${rows_grid|n}

tailbone/views/master.py

@@ -166,6 +166,7 @@ class MasterView(View):
 
     has_rows = False
     model_row_class = None
+    rows_title = None
     rows_pageable = True
     rows_sortable = True
     rows_filterable = True
@@ -224,6 +225,12 @@ class MasterView(View):
         """
         return getattr(cls, 'grid_factory', grids.Grid)
 
+    @classmethod
+    def get_rows_title(cls):
+        # nb. we do not provide a default value for this, since it
+        # will not always make sense to show a row title
+        return cls.rows_title
+
     @classmethod
     def get_row_grid_factory(cls):
         """
@@ -2208,6 +2215,7 @@ class MasterView(View):
             context['grid_count'] = self.grid_count
 
         if self.has_rows:
+            context['rows_title'] = self.get_rows_title()
             context['row_permission_prefix'] = self.get_row_permission_prefix()
             context['row_model_title'] = self.get_row_model_title()
             context['row_model_title_plural'] = self.get_row_model_title_plural()