TreeModel path cache: clear path cache when data changes...

* Allow to disable by setting interface.treemodel-cache-size to 0
* Protection if mode/view gets different

gramps/gui/views/treemodels/basemodel.py

@@ -63,7 +63,9 @@ class BaseModel(object):
         or a name (special value used by view).
         """
         if handle in self.lru_data and col in self.lru_data[handle]:
+            #print("hit", handle, col)
             return (True, self.lru_data[handle][col])
+        #print("MISS", handle, col)
         return (False, None)
 
     def set_cached_value(self, handle, col, data):
@@ -71,6 +73,7 @@ class BaseModel(object):
         Set the data associated with handle + col.
         """
         if not self._in_build:
+            if self.lru_data.count > 0:
                 if handle not in self.lru_data:
                     self.lru_data[handle] = {}
                 self.lru_data[handle][col] = data
@@ -90,3 +93,9 @@ class BaseModel(object):
         """
         if not self._in_build:
             self.lru_path[handle] = path
+
+    def clear_path_cache(self):
+        """
+        Clear path cache for all.
+        """
+        self.lru_path.clear()

gramps/gui/views/treemodels/lru.py

@@ -39,7 +39,10 @@ class LRU(object):
     Implementation of a length-limited O(1) LRU cache
     """
     def __init__(self, count):
-        self.count = max(count, 2)
+        """
+        Set count to 0 or 1 to disable.
+        """
+        self.count = count
         self.data = {}
         self.first = None
         self.last = None
@@ -60,6 +63,8 @@ class LRU(object):
         """
         Set the item in the LRU, removing an old entry if needed
         """
+        if self.count <= 1: # Disabled
+            return
         if obj in self.data:
             del self[obj]
         nobj = Node(self.last, (obj, val))

gramps/gui/views/treemodels/treebasemodel.py

@@ -409,6 +409,7 @@ class TreeBaseModel(GObject.GObject, Gtk.TreeModel, BaseModel):
         """
         Clear the data map.
         """
+        self.clear_cache()
         self.tree.clear()
         self.handle2node.clear()
         self.stamp += 1
@@ -618,6 +619,7 @@ class TreeBaseModel(GObject.GObject, Gtk.TreeModel, BaseModel):
         add_parent  Bool, if True, check if parent is present, if not add the 
                     parent as a top group with no handle
         """
+        self.clear_path_cache()
         if add_parent and not (parent in self.tree):
             #add parent to self.tree as a node with no handle, as the first
             #group level
@@ -668,6 +670,7 @@ class TreeBaseModel(GObject.GObject, Gtk.TreeModel, BaseModel):
         """
         Remove a node from the map.
         """
+        self.clear_path_cache()
         if node.children:
             del self.handle2node[node.handle]
             node.set_handle(None)
@@ -694,6 +697,7 @@ class TreeBaseModel(GObject.GObject, Gtk.TreeModel, BaseModel):
         rows_reordered, so to propagate the change to the view, you need to
         reattach the model to the view. 
         """
+        self.clear_path_cache()
         self.__reverse = not self.__reverse
         top_node = self.tree[None]
         self._reverse_level(top_node)
@@ -729,16 +733,17 @@ class TreeBaseModel(GObject.GObject, Gtk.TreeModel, BaseModel):
         
     def add_row(self, handle, data):
         """
-        Add a row to the model.  In general this will add more then one node by
+        Add a row to the model.  In general this will add more than one node by
         using the add_node method.
         """
-        raise NotImplementedError
+        self.clear_path_cache()
 
     def add_row_by_handle(self, handle):
         """
         Add a row to the model.
         """
         assert isinstance(handle, str)
+        self.clear_path_cache()
         if self._get_node(handle) is not None:
             return # row already exists
         cput = time.clock()
@@ -763,11 +768,11 @@ class TreeBaseModel(GObject.GObject, Gtk.TreeModel, BaseModel):
         """
         assert isinstance(handle, str)
         cput = time.clock()
+        self.clear_cache(handle)
         node = self._get_node(handle)
         if node is None:
             return # row not currently displayed
 
-        self.clear_cache(handle)
         parent = self.nodemap.node(node.parent)
         self.remove_node(node)
         
@@ -793,6 +798,7 @@ class TreeBaseModel(GObject.GObject, Gtk.TreeModel, BaseModel):
         Update a row in the model.
         """
         assert isinstance(handle, str)
+        self.clear_cache(handle)
         if self._get_node(handle) is None:
             return # row not currently displayed
 
@@ -956,10 +962,13 @@ class TreeBaseModel(GObject.GObject, Gtk.TreeModel, BaseModel):
             pathlist = path.get_indices()
         for index in pathlist:
             _index = (-index - 1) if self.__reverse else index
+            try:
                 if len(node.children[_index]) > 0:
                     node = self.nodemap.node(node.children[_index][1])
                 else:
                     return False, Gtk.TreeIter()
+            except IndexError:
+                return False, Gtk.TreeIter()
         return True, self._get_iter(node)
 
     def get_node_from_iter(self, iter):