# SyGridFillStartEventDetail

Fields, allowed values, and APIs that use SyGridFillStartEventDetail.

Canonical: https://grid.syidax.com/docs/types/SyGridFillStartEventDetail/

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## Type definition

A question mark (?) marks an optional field; readonly marks a value you should not change directly. A union (|) accepts one of the listed forms. Functions are callbacks that Grid invokes at the relevant point.

```typescript
export interface SyGridFillStartEventDetail {
  mode: FillPlanMode;
  source: CellRangeBounds;
  target: CellRangeBounds | null;
  direction: FillDirection | null;
  mutationId: GridMutationId;
  sourceRangeId: number;
}
```

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## APIs using this type

- [fillStart](https://grid.syidax.com/docs/events/fillStart.md) — Emitted when range filling starts.

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## Contracts containing this type

- [SyGridEventMap](https://grid.syidax.com/docs/types/SyGridEventMap.md)

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## Related types

- [FillPlanMode](https://grid.syidax.com/docs/types/FillPlanMode.md)
- [CellRangeBounds](https://grid.syidax.com/docs/types/CellRangeBounds.md)
- [FillDirection](https://grid.syidax.com/docs/types/FillDirection.md)
- [GridMutationId](https://grid.syidax.com/docs/types/GridMutationId.md)