Trait undo::Command

pub trait Command<T>: 'static + Debug {
    fn apply(&mut self, target: &mut T) -> Result;
    fn undo(&mut self, target: &mut T) -> Result;

    fn redo(&mut self, target: &mut T) -> Result { ... }
    fn merge(&self) -> Merge { ... }
    fn text(&self) -> String { ... }
}

Base functionality for all commands.

Required methods

fn apply(&mut self, target: &mut T) -> Result

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

fn undo(&mut self, target: &mut T) -> Result

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

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Provided methods

fn redo(&mut self, target: &mut T) -> Result

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

The default implementation uses the apply implementation.

fn merge(&self) -> Merge

Used for automatic merging of commands.

When commands are merged together, undoing and redoing them are done in one step.

fn text(&self) -> String

Returns the text of the command.

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Implementors

impl<T, A: Command<T>, B: Command<T>> Command<T> for Join<A, B>

fn apply(&mut self, target: &mut T) -> Result

fn undo(&mut self, target: &mut T) -> Result

fn redo(&mut self, target: &mut T) -> Result

fn merge(&self) -> Merge

fn text(&self) -> String

impl<T, C: Command<T>> Command<T> for WithMerge<C>

fn apply(&mut self, target: &mut T) -> Result

fn undo(&mut self, target: &mut T) -> Result

fn redo(&mut self, target: &mut T) -> Result

fn merge(&self) -> Merge

fn text(&self) -> String

impl<T, C: Command<T>> Command<T> for WithText<C>

fn apply(&mut self, target: &mut T) -> Result

fn undo(&mut self, target: &mut T) -> Result

fn redo(&mut self, target: &mut T) -> Result

fn merge(&self) -> Merge

fn text(&self) -> String

impl<T: Debug + Clone, F: FnMut(&mut T)> Command<T> for FromFn<T, F>

fn apply(&mut self, target: &mut T) -> Result

fn undo(&mut self, target: &mut T) -> Result

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