1 files changed, 19 insertions, 0 deletions
diff --git a/web/src/selection.ts b/web/src/selection.ts
index 294db52..abaf8b5 100644
--- a/web/src/selection.ts
+++ b/web/src/selection.ts
@@ -17,6 +17,9 @@ export abstract class Selection {
   abstract extend(cellRef: CellRef): Selection;
 
   abstract getSelectedCells(grid: RenderedGrid): RenderedCell[][];
+
+  abstract startCellRef(): CellRef;
+  abstract endCellRef(): CellRef;
 }
 
 export class ActiveCellSelection extends Selection {
@@ -34,6 +37,14 @@ export class ActiveCellSelection extends Selection {
   getSelectedCells(grid: RenderedGrid): RenderedCell[][] {
     return [[getRenderedCell(grid, this.activeCellRef)!]];
   }
+
+  startCellRef(): CellRef {
+    return this.activeCellRef;
+  }
+
+  endCellRef(): CellRef {
+    return this.activeCellRef;
+  }
 }
 
 export type CellRange = [CellRef, CellRef];
@@ -101,4 +112,12 @@ export class RangeSelection extends Selection {
         return row.renderedCells.slice(firstCellIndex, lastCellIndex + 1);
       });
   }
+
+  startCellRef(): CellRef {
+    return this.range[0];
+  }
+
+  endCellRef(): CellRef {
+    return this.range[1];
+  }
 }