Enum ChangeSource 

#[non_exhaustive]
pub enum ChangeSource {
    User,
    Programmatic,
    Remote,
}

Whose change this is.

Ambient on the open transaction rather than a parameter on every mutator: widening two dozen public signatures to thread it would be a worse API and would still miss the framework’s own gesture code, which is the one caller an app cannot reach.

The framework opens ChangeSource::User transactions around exactly the places it writes the model on the user’s behalf — the item-drag commit, the selection-transform commit and the Alt+arrow nudge. Without that, an app could not tell a finished drag from a programmatic move: both arrive as a bare LocalPosChanged.

#[non_exhaustive]: this crate has out-of-tree consumers.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

User

A direct user interaction — a drag, a nudge, a transform handle.

Programmatic

The app moved the scene itself: a document load, a layout pass, a data re-source, an import, an animation tick. The default, because a mutation nobody claimed is not a user’s.

Remote

Applied on behalf of a peer — collaboration, replay, a data-layer redo. A consumer re-broadcasting or recording history is expected to skip these; the framework does not interpret it.

Trait Implementations

impl Clone for ChangeSource

fn clone(&self) -> ChangeSource

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for ChangeSource

impl Debug for ChangeSource

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

Formats the value using the given formatter.

impl Default for ChangeSource

fn default() -> ChangeSource

Returns the “default value” for a type.

impl Eq for ChangeSource

impl PartialEq for ChangeSource

fn eq(&self, other: &ChangeSource) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for ChangeSource