Struct Undoer 

pub struct Undoer<State> { /* private fields */ }

Automatic undo system. Feed it the latest state every frame; it decides when to snapshot a new undo point.

Implementations

impl<State> Undoer<State>

where State: Clone + PartialEq,

pub fn with_settings(settings: Settings) -> Self

Create an Undoer with custom Settings (used by tests to shrink the coalescing windows).

pub fn has_undo(&self, current_state: &State) -> bool

Do we have an undo point different from the given state?

pub fn has_redo(&self, current_state: &State) -> bool

Do we have a redo point available for the given state?

pub fn is_in_flux(&self) -> bool

Is the state currently mid-change (a flux is being tracked)?

pub fn undo(&mut self, current_state: &State) -> Option<&State>

Undo one step, returning the state to revert to (if any).

pub fn redo(&mut self, current_state: &State) -> Option<&State>

Redo one step, returning the state to advance to (if any).

pub fn add_undo(&mut self, current_state: &State)

Add an undo point iff the state differs from the latest point.

pub fn feed_state(&mut self, current_time: f64, current_state: &State)

Feed the most recent state (call every frame). current_time is in seconds. Implements the two coalescing rules described on egui’s Undoer.

Trait Implementations

impl<State: Clone> Clone for Undoer<State>

fn clone(&self) -> Undoer<State>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<State> Default for Undoer<State>

where State: Clone + PartialEq,

fn default() -> Self

Returns the “default value” for a type.