Struct TestComposition 

pub struct TestComposition { /* private fields */ }

In-memory composition helper used by tests.

Implementations

impl TestComposition

pub fn root(&self) -> Option<NodeId>

Returns the id of the root node, or None when the composition has no root node.

pub fn runtime_handle(&self) -> RuntimeHandle

Returns the runtime handle of the composition.

pub fn should_render(&self) -> bool

Returns true when state changes or animation callbacks have work pending.

pub fn take_root_render_request(&mut self) -> bool

Returns true once if a root render was requested since the last call, then resets the request.

pub fn flush_pending_node_updates(&mut self) -> Result<(), NodeError>

Applies the node updates that state changes queued.

pub fn process_invalid_scopes(&mut self) -> Result<bool, NodeError>

Recomposes the scopes that state changes invalidated. Returns true when any scope recomposed.

pub fn render( &mut self, root_key: Key, content: impl FnMut(), ) -> Result<(), NodeError>

Renders content as the root composition under root_key, then recomposes invalidated scopes.

pub fn applier_mut(&mut self) -> TestApplierGuard<'_>

Borrows the applier that holds the node tree. The guard keeps this composition’s app context active.

pub fn with_app_context<R>(&self, block: impl FnOnce() -> R) -> R

Runs block with this composition’s app context active.