Enum UndoRedoEvent 

pub enum UndoRedoEvent {
    Undone,
    Redone,
    StackChanged,
    BeginComposite,
    EndComposite,
    CancelComposite,
}

Variants

Undone

Redone

StackChanged

A stack’s history changed other than by undoing or redoing it — a command pushed, a command merged into the one below it, a stack cleared.

Without this a UI cannot know that “can undo” just became true: the manager announced only the consumption of history, never its creation, so an Undo menu row had nothing to react to and had to be polled. Carries the stack id in Event::data, like every other variant here, so a process holding several stacks can tell whose history moved.

BeginComposite

EndComposite

CancelComposite

Trait Implementations

impl Clone for UndoRedoEvent

fn clone(&self) -> UndoRedoEvent

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for UndoRedoEvent

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

Formats the value using the given formatter.

impl Eq for UndoRedoEvent

impl Hash for UndoRedoEvent

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for UndoRedoEvent

fn eq(&self, other: &UndoRedoEvent) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl Serialize for UndoRedoEvent

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for UndoRedoEvent