feat(services): add onBeforeResizeByContent (onAfter)

packages/vanilla-bundle/src/services/__tests__/resizer.service.spec.ts

@@ -309,6 +309,7 @@ describe('Resizer Service', () => {
       it('should call the resize and expect first column have a fixed width while other will have a calculated width when resizing by their content', () => {
         const setColumnsSpy = jest.spyOn(gridStub, 'setColumns');
         const reRenderColumnsSpy = jest.spyOn(gridStub, 'reRenderColumns');
+        const pubSubSpy = jest.spyOn(pubSubServiceStub, 'publish');
 
         service.init(gridStub, divContainer);
         service.resizeColumnsByCellContent(true);
@@ -324,11 +325,17 @@ describe('Resizer Service', () => {
             expect.objectContaining({ id: 'country', width: 14 }), // longest number "United States of America" goes over resizeMaxWidthThreshold so we fallback to it
           ]));
         expect(reRenderColumnsSpy).toHaveBeenCalledWith(true);
+        expect(pubSubSpy).toBeCalledWith('onBeforeResizeByContent');
+        expect(pubSubSpy).toBeCalledWith('onAfterResizeByContent', {
+          calculateColumnWidths: { userId: 30, firstName: 56, lastName: 68, gender: 57, age: 29, street: 15, country: 14, },
+          readItemCount: 5
+        });
       });
 
       it('should call the resize and expect first column have a fixed width while other will have a calculated width when resizing by their content and grid is editable', () => {
         const setColumnsSpy = jest.spyOn(gridStub, 'setColumns');
         const reRenderColumnsSpy = jest.spyOn(gridStub, 'reRenderColumns');
+        const pubSubSpy = jest.spyOn(pubSubServiceStub, 'publish');
 
         mockGridOptions.editable = true;
         service.init(gridStub, divContainer);
@@ -346,6 +353,11 @@ describe('Resizer Service', () => {
             expect.objectContaining({ id: 'country', width: 14 }), // longest number "United States of America" goes over resizeMaxWidthThreshold so we fallback to it
           ]));
         expect(reRenderColumnsSpy).toHaveBeenCalledWith(true);
+        expect(pubSubSpy).toBeCalledWith('onBeforeResizeByContent');
+        expect(pubSubSpy).toBeCalledWith('onAfterResizeByContent', {
+          calculateColumnWidths: { userId: 30, firstName: 61, lastName: 73, gender: 57, age: 29, street: 15, country: 14, },
+          readItemCount: 5
+        });
       });
     });
   });

packages/vanilla-bundle/src/services/resizer.service.ts

@@ -160,6 +160,8 @@ export class ResizerService {
     if (!Array.isArray(dataset) || dataset.length === 0) {
       return;
     }
+    this.eventPubSubService.publish('onBeforeResizeByContent');
+    let readItemCount = 0;
 
     // read a few optional resize by content grid options
     const resizeCellCharWidthInPx = this.gridOptions.resizeCellCharWidthInPx ?? 7; // width in pixels of a string character, this can vary depending on which font family/size is used & cell padding
@@ -196,6 +198,7 @@ export class ResizerService {
             }
           }
         });
+        readItemCount = rowIdx + 1;
       }
 
       // finally loop through all column definitions one last time to apply new calculated `width` on each elligible column
@@ -254,10 +257,16 @@ export class ResizerService {
     // send updated column definitions widths to SlickGrid
     this._grid.setColumns(columnDefinitions);
 
+    const calculateColumnWidths: { [columnId in string | number]: number | undefined; } = {};
+    for (const columnDef of columnDefinitions) {
+      calculateColumnWidths[columnDef.id] = columnDef.width;
+    }
+
     // get the grid container viewport width and if our viewport calculated total columns is greater than the viewport width
     // then we'll call reRenderColumns() when getting wider than viewport or else the default autosizeColumns() when we know we have plenty of space to shrink the columns
     const viewportWidth = this._gridParentContainerElm?.offsetWidth ?? 0;
     this._totalColumnsWidthByContent > viewportWidth ? this._grid.reRenderColumns(reRender) : this._grid.autosizeColumns();
+    this.eventPubSubService.publish('onAfterResizeByContent', { readItemCount, calculateColumnWidths });
   }
 
   /**