Struct CompoundCommand 

pub struct CompoundCommand<C> { /* private fields */ }

A group of commands executed as a single undo/redo unit.

Commands are applied in order and reversed in reverse order (matching shruti’s Compound variant behaviour). If a sub-command fails during apply, all previously-applied sub-commands are rolled back (best-effort).

Implementations

impl<C> CompoundCommand<C>

pub fn new(description: &'static str, commands: Vec<C>) -> Self

Create a compound command with a static description.

pub fn with_description(description: String, commands: Vec<C>) -> Self

Create a compound command with a dynamic description.

pub fn len(&self) -> usize

Number of sub-commands.

pub fn is_empty(&self) -> bool

Whether this compound command has no sub-commands.

pub fn commands(&self) -> &[C]

Access the sub-commands.

Trait Implementations

impl<C: Clone> Clone for CompoundCommand<C>

fn clone(&self) -> CompoundCommand<C>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<C: Command> Command for CompoundCommand<C>

type Target = <C as Command>::Target

The state this command operates on (e.g. a session, timeline, canvas).

type Error = <C as Command>::Error

Error type. Use std::convert::Infallible for infallible commands.

fn apply(&mut self, target: &mut Self::Target) -> Result<(), Self::Error>

Apply the command to the target.

fn reverse(&mut self, target: &mut Self::Target) -> Result<(), Self::Error>

Reverse the command, restoring the target to its prior state.

fn description(&self) -> &str

Human-readable description for undo/redo menu display.

impl<C: Debug> Debug for CompoundCommand<C>

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

Formats the value using the given formatter.