Expose activate method

src/Spreadsheet.test.tsx

@@ -4,7 +4,7 @@
 
 import React from "react";
 import { fireEvent, render, screen } from "@testing-library/react";
-import Spreadsheet, { Props } from "./Spreadsheet";
+import Spreadsheet, { Props, SpreadsheetRef } from "./Spreadsheet";
 import * as Matrix from "./matrix";
 import * as Types from "./types";
 import * as Point from "./point";
@@ -478,6 +478,76 @@ describe("<Spreadsheet />", () => {
   });
 });
 
+describe("Spreadsheet Ref Methods", () => {
+  beforeEach(() => {
+    jest.clearAllMocks();
+  });
+
+  test("ref.activate activates the specified cell", () => {
+    const onActivate = jest.fn();
+    const ref = React.createRef<SpreadsheetRef>();
+
+    render(
+      <Spreadsheet {...EXAMPLE_PROPS} ref={ref} onActivate={onActivate} />
+    );
+
+    // Ensure ref is defined
+    expect(ref.current).not.toBeNull();
+
+    // Call activate method via ref
+    const targetPoint = { row: 1, column: 1 };
+    React.act(() => {
+      ref.current?.activate(targetPoint);
+    });
+
+    // Verify onActivate was called with correct point
+    expect(onActivate).toHaveBeenCalledTimes(1);
+    expect(onActivate).toHaveBeenCalledWith(targetPoint);
+  });
+
+  test("ref methods are memoized and stable between renders", () => {
+    const ref = React.createRef<SpreadsheetRef>();
+    const { rerender } = render(<Spreadsheet {...EXAMPLE_PROPS} ref={ref} />);
+
+    // Store initial methods
+    const initialActivate = ref.current?.activate;
+
+    // Trigger re-render
+    rerender(<Spreadsheet {...EXAMPLE_PROPS} ref={ref} />);
+
+    // Methods should be referentially stable
+    expect(ref.current?.activate).toBe(initialActivate);
+  });
+
+  test("activate method handles invalid points gracefully", () => {
+    const onActivate = jest.fn();
+    const ref = React.createRef<SpreadsheetRef>();
+
+    render(
+      <Spreadsheet {...EXAMPLE_PROPS} ref={ref} onActivate={onActivate} />
+    );
+
+    // Try to activate cell outside grid bounds
+    const invalidPoint = { row: ROWS + 1, column: COLUMNS + 1 };
+    React.act(() => {
+      ref.current?.activate(invalidPoint);
+    });
+
+    // Should still call onActivate with the provided point
+    expect(onActivate).toHaveBeenCalledTimes(1);
+    expect(onActivate).toHaveBeenCalledWith(invalidPoint);
+  });
+
+  test("ref is properly typed as SpreadsheetRef", () => {
+    const ref = React.createRef<SpreadsheetRef>();
+
+    render(<Spreadsheet {...EXAMPLE_PROPS} ref={ref} />);
+
+    // TypeScript compilation would fail if ref typing is incorrect
+    expect(typeof ref.current?.activate).toBe("function");
+  });
+});
+
 /** Like .querySelector() but throws for no match */
 function safeQuerySelector<T extends Element = Element>(
   node: ParentNode,

src/Spreadsheet.tsx

@@ -123,11 +123,24 @@
   onEvaluatedDataChange?: (data: Matrix.Matrix<CellType>) => void;
 };
 
+/**
+ * The Spreadsheet Ref Type
+ */
+
+export type SpreadsheetRef = {
+  /**
+   * Pass the desired point as a prop to specify which one should be activated.
+   */
+  activate: (point: Point.Point) => void;
+};
+
 /**
  * The Spreadsheet component
  */
-const Spreadsheet = <CellType extends Types.CellBase>(
-  props: Props<CellType>
+
+const Spreadsheet = <SpreadsheetRef, CellType extends Types.CellBase>(
+  props: Props<CellType>,
+  ref: React.ForwardedRef<SpreadsheetRef>
 ): React.ReactElement => {
   const {
     className,
@@ -198,6 +211,23 @@
   const setCreateFormulaParser = useAction(Actions.setCreateFormulaParser);
   const blur = useAction(Actions.blur);
   const setSelection = useAction(Actions.setSelection);
+  const activate = useAction(Actions.activate);
+
+  // Memoize methods to be exposed via ref
+  const methods = React.useMemo(
+    () => ({
+      activate: (point: Point.Point) => {
+        activate(point);
+      },
+    }),
+    []
+  );
+
+  // Expose methods to parent via ref
+  React.useImperativeHandle<SpreadsheetRef, SpreadsheetRef>(
+    ref,
+    () => methods as SpreadsheetRef
+  );
 
   // Track active
   const prevActiveRef = React.useRef<Point.Point | null>(state.active);
@@ -557,4 +587,4 @@
   );
 };
 
-export default Spreadsheet;
+export default React.forwardRef(Spreadsheet);

src/index.ts

@@ -1,9 +1,9 @@
-import Spreadsheet from "./Spreadsheet";
+import Spreadsheet, { SpreadsheetRef } from "./Spreadsheet";
 import DataEditor from "./DataEditor";
 import DataViewer from "./DataViewer";
 
 export default Spreadsheet;
-export { Spreadsheet, DataEditor, DataViewer };
+export { Spreadsheet, DataEditor, DataViewer, SpreadsheetRef };
 export type { Props } from "./Spreadsheet";
 export { createEmpty as createEmptyMatrix } from "./matrix";
 export type { Matrix } from "./matrix";

src/stories/Spreadsheet.stories.tsx

@@ -10,14 +10,15 @@ import {
   EntireRowsSelection,
   EntireColumnsSelection,
   EmptySelection,
+  Point,
+  SpreadsheetRef,
 } from "..";
 import * as Matrix from "../matrix";
 import { AsyncCellDataEditor, AsyncCellDataViewer } from "./AsyncCellData";
 import CustomCell from "./CustomCell";
 import { RangeEdit, RangeView } from "./RangeDataComponents";
 import { SelectEdit, SelectView } from "./SelectDataComponents";
 import { CustomCornerIndicator } from "./CustomCornerIndicator";
-
 type StringCell = CellBase<string | undefined>;
 type NumberCell = CellBase<number | undefined>;
 
@@ -305,3 +306,49 @@ export const ControlledSelection: StoryFn<Props<StringCell>> = (props) => {
     </div>
   );
 };
+
+export const ControlledActivation: StoryFn<Props<StringCell>> = (props) => {
+  const spreadsheetRef = React.useRef<SpreadsheetRef>();
+
+  const [activationPoint, setActivationPoint] = React.useState<Point>({
+    row: 0,
+    column: 0,
+  });
+
+  const handleActivate = React.useCallback(() => {
+    spreadsheetRef.current?.activate(activationPoint);
+  }, [activationPoint]);
+
+  return (
+    <div>
+      <div>
+        <input
+          id="row"
+          title="row"
+          type="number"
+          value={activationPoint.row}
+          onChange={(e) =>
+            setActivationPoint(() => ({
+              ...activationPoint,
+              row: Number(e.target.value),
+            }))
+          }
+        />
+        <input
+          id="column"
+          title="row"
+          type="column"
+          value={activationPoint.column}
+          onChange={(e) =>
+            setActivationPoint(() => ({
+              ...activationPoint,
+              column: Number(e.target.value),
+            }))
+          }
+        />
+        <button onClick={handleActivate}>Activate</button>
+      </div>
+      <Spreadsheet ref={spreadsheetRef} {...props} />;
+    </div>
+  );
+};