Struct UndoStack 

pub struct UndoStack<T> { /* private fields */ }

A stack of undo states

Typically T will be either State or (Id, State).

Implementations

impl<T: PartialEq> UndoStack<T>

pub const fn new() -> Self

Construct a new instance (const)

pub fn clear(&mut self)

Clear all history

pub fn try_push(&mut self, state: T)

Push a new state

Tries pushing a new state, failing if the new state is identical to the current one.

On success this discards all states ahead of the current state (due to usage of undo).

pub fn undo_or_redo(&mut self, redo: bool) -> Option<&T>

Apply undo (or redo if redo), yielding the appropriate committed state (if any)

impl<K: Eq, S> UndoStack<(K, S)>

pub fn clear_for_key(&mut self, key: K)

Clear historical states for key

Typically used for K = Id.

Trait Implementations

impl<T: Clone> Clone for UndoStack<T>

fn clone(&self) -> UndoStack<T>

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<T: Debug> Debug for UndoStack<T>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<T> Default for UndoStack<T>

fn default() -> Self

Returns the “default value” for a type.