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treeview: Add _gtk_rbtree_find_index()

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Uses the parity to do an O(log N) search for the nth element in the
tree in display order of the treeview.
This commit is contained in:
Benjamin Otte 2011-07-07 09:52:24 +02:00
parent 59097ecef4
commit 635e53433d
2 changed files with 54 additions and 0 deletions
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50
gtk/gtkrbtree.c
View File

@ -1104,6 +1104,56 @@ _gtk_rbtree_find_offset (GtkRBTree *tree,
return _gtk_rbtree_real_find_offset (tree, height, new_tree, new_node);
}
gboolean
_gtk_rbtree_find_index (GtkRBTree *tree,
guint index,
GtkRBTree **new_tree,
GtkRBNode **new_node)
{
GtkRBNode *tmp_node;
g_assert (tree);
tmp_node = tree->root;
while (tmp_node != tree->nil)
{
if (tmp_node->left->total_count > index)
{
tmp_node = tmp_node->left;
}
else if (tmp_node->total_count - tmp_node->right->total_count <= index)
{
index -= tmp_node->total_count - tmp_node->right->total_count;
tmp_node = tmp_node->right;
}
else
{
index -= tmp_node->left->total_count;
break;
}
}
if (tmp_node == tree->nil)
{
*new_tree = NULL;
*new_node = NULL;
return FALSE;
}
if (index > 0)
{
g_assert (tmp_node->children);
return _gtk_rbtree_find_index (tmp_node->children,
index - 1,
new_tree,
new_node);
}
*new_tree = tree;
*new_node = tmp_node;
return TRUE;
}
void
_gtk_rbtree_remove_node (GtkRBTree *tree,
GtkRBNode *node)

4
gtk/gtkrbtree.h
View File

@ -135,6 +135,10 @@ gint _gtk_rbtree_node_find_offset (GtkRBTree *tree,
GtkRBNode *node);
gint _gtk_rbtree_node_find_parity (GtkRBTree *tree,
GtkRBNode *node);
gboolean _gtk_rbtree_find_index (GtkRBTree *tree,
guint index,
GtkRBTree **new_tree,
GtkRBNode **new_node);
gint _gtk_rbtree_find_offset (GtkRBTree *tree,
gint offset,
GtkRBTree **new_tree,