Struct History 

pub struct History { /* private fields */ }

Implementations

impl History

pub fn record(&mut self, kind: EditKind, before: Rope, selections: &Selections)

Record the state before an edit, unless it continues the open run.

Continuing a run means not pushing: the snapshot already on the stack predates the whole run, which is exactly the state undo should restore.

pub fn depth(&self) -> usize

How many steps are on the undo stack. For tests and for a future status segment; nothing in the editor branches on it.

pub fn boundary(&mut self)

End the open run, so the next edit starts a new undo step.

Called on anything that is not an edit — a motion, a click, a save.

pub fn undo( &mut self, current: Rope, selections: &Selections, ) -> Option<Snapshot>

Returns the state to restore, banking current for redo.

pub fn redo( &mut self, current: Rope, selections: &Selections, ) -> Option<Snapshot>

Trait Implementations

impl Default for History

fn default() -> History

Returns the “default value” for a type.