Struct undo::Merger

pub struct Merger<R, C: Command<R> + 'static> { /* fields omitted */ }

A command wrapper which always merges with itself.

This wrapper has an id of u32::max_value.

Methods

impl<R, C: Command<R> + 'static> Merger<R, C>

pub fn new(cmd: C) -> Merger<R, C>

Returns a new merger command.

pub fn into_command(self) -> C

Returns the inner command.

Trait Implementations

impl<R, C: Command<R> + 'static> From<C> for Merger<R, C>

fn from(cmd: C) -> Self

Performs the conversion.

impl<R, C: Command<R> + 'static> Command<R> for Merger<R, C>

fn apply(&mut self, receiver: &mut R) -> Result<(), Box<Error + Send + Sync>>

Applies the command on the receiver and returns Ok if everything went fine, and Err if something went wrong.

fn undo(&mut self, receiver: &mut R) -> Result<(), Box<Error + Send + Sync>>

Restores the state of the receiver as it was before the command was applied and returns Ok if everything went fine, and Err if something went wrong.

fn redo(&mut self, receiver: &mut R) -> Result<(), Box<Error + Send + Sync>>

Reapplies the command on the receiver and return Ok if everything went fine, and Err if something went wrong.

fn id(&self) -> Option<u32>

Used for automatic merging of commands.

impl<R, C: Command<R> + 'static> Debug for Merger<R, C>

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

Formats the value using the given formatter.