Struct Move 

pub struct Move<K: 'static> { /* private fields */ }

A native hierarchical tree (docs/tree.md): rows nest, disclose, and drag to a new parent. The platform widget owns scrolling, disclosure and cell reuse; Day builds each visible row once and rebinds it as cells recycle (list()’s contract, token-addressed). Gate its UI on Cap::Tree: a backend without tree support renders nothing. Drag-to-move for a tree (docs/tree.md): the handler that applies a committed re-parent, an optional guard consulted while the drag is live, and whether the gesture is offered right now. A tree is movable exactly when it carries one of these (tree(..).movable(Move::new(f))). The list() counterpart is Reorder.

Implementations

impl<K: 'static> Move<K>

pub fn new(moved: impl Fn(K, Option<K>, Option<usize>) + 'static) -> Move<K>

moved(key, parent, index) runs after a committed move: key now sits under parent (None = the root) at index (None = dropped onto the parent: append). Apply the same re-parent to the backing data; its refresh reloads the tree. Runs at the next event drain, never inside the native drop callback.

pub fn guard( self, g: impl Fn(&K, Option<&K>, Option<usize>) -> MoveVerdict + 'static, ) -> Move<K>

Veto drops while the drag is live. The structural refusals (a row into itself, into its own descendant, into a leaf) are built in; this guard adds the app’s own. Keep it pure: it runs inside the platform’s drag callback.

pub fn enabled<M>(self, on: impl IntoReactive<bool, M>) -> Move<K>

Whether the gesture is offered right now (default true): a constant or a reactive bool, read when the platform asks whether a drag may begin.