Struct UndoManager 

pub struct UndoManager { /* private fields */ }

Unified manager for undo and redo stacks. Supports grouping of actions, max undo depth clamping, and coalescing.

Implementations

impl UndoManager

pub fn new(max_depth: usize, coalesce_window: f32) -> Self

Create a new UndoManager with custom settings.

pub fn push( &mut self, label: &str, undo: impl Fn() + Send + Sync + 'static, redo: impl Fn() + Send + Sync + 'static, )

Push a new undo/redo group to the stack, clearing any forward redo history.

pub fn undo(&mut self) -> Option<Arc<dyn Fn() + Send + Sync>>

Perform the undo action if possible, moving the position back. Returns the undo closure to be executed outside of any state lock.

pub fn redo(&mut self) -> Option<Arc<dyn Fn() + Send + Sync>>

Perform the redo action if possible, moving the position forward. Returns the redo closure to be executed outside of any state lock.

pub fn can_undo(&self) -> bool

Returns true if there is an action that can be undone.

pub fn can_redo(&self) -> bool

Returns true if there is an action that can be redone.

pub fn clear(&mut self)

Clear all undo/redo history.

pub fn push_coalesceable( &mut self, label: &str, undo: impl Fn() + Send + Sync + 'static, redo: impl Fn() + Send + Sync + 'static, )

Push a new coalesceable action. If the last action in the stack matches the label, is within the coalesce window, and the position is at the end of the stack, their undo/redo functions will be combined instead of creating a new group.

Trait Implementations

impl Clone for UndoManager

fn clone(&self) -> Self

Clone the undo manager, preserving stacks and position.

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

Performs copy-assignment from source.

impl Debug for UndoManager

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

Debug format helper for UndoManager.

impl Default for UndoManager

fn default() -> Self

Create a default UndoManager with a depth of 100 and a 0.5s coalesce window.