API Reference > imodeljs-frontend > SelectionSet > SelectionTool > onMouseStartDrag onMouseStartDrag Method Invoked when the cursor begins moving while a button is depressed. onMouseStartDrag(ev: BeButtonEvent): Promise<EventHandled> Parameter Type Description ev BeButtonEvent Returns - Promise<EventHandled> Yes if event completely handled by tool and event should not be passed on to the IdleTool. Defined in core/frontend/src/tools/SelectTool.ts Line 473 Last Updated: 11 June, 2024