builder property
Per-mode wrap of the captured widget. Resolved in the cascade gesture.bounds.builder > gesture.builder > displayConfig > Origin.builder. Use this to layer mode-specific visual content over the captured widget (e.g. a picker chrome that crossfades between an icon and a button row as the rect interpolates from origin to base). Taps inside the builder are absorbed by Stage's gesture detector — interactive tap targets belong in overlay or in a position-dispatching onTap.
Implementation
final StageBuilder? builder;