[table] working headers

nixview/util/dataview.py

@@ -13,6 +13,7 @@ class DataView():
         self._fetched_data = np.zeros(len(self._full_shape), dtype=int)
         self._count = None
         self._cut_dim = None
+        self._dim_count = len(self._full_shape)
         self.init_buffer()
         self.request_more()
 
@@ -68,10 +69,18 @@ class DataView():
     def full_shape(self):
         return self._full_shape
 
+    @property
+    def dimension_count(self):
+        return self._dim_count
+
     @property
     def current_shape(self):
         return self._fetched_data
-    
+
+    @property
+    def item(self):
+        return self._item_descriptor
+
     def __str__(self) -> str:
         r = self._item_descriptor.name + " " + str(self._item_descriptor.entity_type)
         r += " buffer size: "  + str(self._buffer.shape) if self._buffer is not None else "" + "\n"