Enum UndoBehavior 

pub enum UndoBehavior {
    InsertCharacter(char),
    Backspace(Option<char>),
    Delete(Option<char>),
    MoveCursor,
    HistoryNavigation,
    CreateUndoPoint,
    UndoRedo,
}

Every line change should come with an UndoBehavior tag, which can be used to calculate how the change should be reflected on the undo stack

Variants

InsertCharacter(char)

Character insertion, tracking the character inserted

Backspace(Option<char>)

Backspace command, tracking the deleted character (left of cursor) Warning: this does not track the whole grapheme, just the character

Delete(Option<char>)

Delete command, tracking the deleted character (right of cursor) Warning: this does not track the whole grapheme, just the character

MoveCursor

Move the cursor position

HistoryNavigation

Navigated the history using up or down arrows

CreateUndoPoint

Catch-all for actions that should always form a unique undo point and never be grouped with later edits

UndoRedo

Undo/Redo actions shouldn’t be reflected on the edit stack

Implementations

impl UndoBehavior

pub fn create_undo_point_after(&self, previous: &UndoBehavior) -> bool

Return if the current operation should start a new undo set, or be combined with the previous operation

Trait Implementations

impl Debug for UndoBehavior

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

Formats the value using the given formatter.