Thomas Passin, thanks for your comment. On Monday, May 4, 2020 at 6:23:08 AM UTC+2, Thomas Passin wrote: > > > About clones, we always talk about cloning nodes, but it seems to me that > what actually gets cloned is an entire subtree - that is, the clone > includes (clones of) a node's descendants. Perhaps a change in the > conceptual model of clones from nodes to subtrees would make it easier to > work out how to handle them. > > I'm not sure how a subtree is currently modeled in Leo. Since a tree can > be built out of nodes that have child and parent nodes, one can be > constructed without an explicit model for a (sub)tree. But since many > operations we want to do are really on (sub)trees and not nodes, maybe an > explicit tree concept in addition to a node concept would be useful(if > there isn't one already). > > VNode in Leo is always a subtree, although this subtree may be empty (it may contain no other nodes). In its current implementation it is not possible to separate node from the subtree. If a node contains at least one child, it is no longer possible to make a clone of just that node without its children. If you try to remove children from the clone, they will be removed from the outline too. You can copy just values from v node if you wish to have it isolated from its subtree for example when storing Leo document in '.db' format, all v-nodes are decomposed to their values (gnx, h, b, u, statusBits) and two lists one for parents and one for the children. Those two lists contain only gnxes not real v-nodes. Decomposed nodes are then stored in the db table. Later when we want to restore the outline from the db table we first create every node as an isolated single node not connected to any other node. And after all nodes are created, then we go through every list of gnxes and using them we link all children to their parents and vice versa. Of course this is not the only way to decompose v-nodes and recreate them from the decomposed data.
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