withPreviewClock<T> function

T withPreviewClock<T>(
  1. T body()
)

Runs body with the preview clock pinned to pinnedClockOrigin.

Must wrap the whole of the guest's main, binding included. PlatformDispatcher.onBeginFrame captures Zone.current when it is set, and the binding sets it in initInstances — so a zone entered after ensureInitialized would leave every build, layout and paint callback running in the zone that came before it, which is exactly where a demo reads the clock.

Implementation

T withPreviewClock<T>(T Function() body) =>
    withClock(Clock.fixed(pinnedClockOrigin), body);