API Reference > ui-framework > Frontstage > NineZoneChangeHandler NineZoneChangeHandler Interface Interface defining callbacks for nine zone changes Implemented by FrontstageComposer Methods Name Description handleFloatingZonesBoundsChange(bounds: RectangleProps): void handleZonesBoundsChange(bounds: RectangleProps): void Defined in ui/framework/src/ui-framework/frontstage/FrontstageComposer.tsx Line 66 Last Updated: 29 November, 2022