add collectionviewer to disconnect

Author: andrewseguin

src/demo-app/data-table/person-data-source.ts

@@ -50,6 +50,10 @@ export class PersonDataSource extends DataSource<any> {
         });
   }
 
+  disconnect() {
+    // No-op
+  }
+
   updateDisplayData() {
     const data = this._peopleDatabase.data.slice();
 

src/lib/core/data-table/data-source.ts

@@ -14,5 +14,5 @@ export interface CollectionViewer {
 
 export abstract class DataSource<T> {
   abstract connect(collectionViewer: CollectionViewer): Observable<T[]>;
-  disconnect() {}
+  abstract disconnect(collectionViewer: CollectionViewer): void;
 }

src/lib/core/data-table/data-table.ts

@@ -180,7 +180,7 @@ export class CdkTable<T> implements CollectionViewer {
     this._onDestroy.next();
     this._onDestroy.complete();
     if (this.dataSource) {
-      this.dataSource.disconnect();
+      this.dataSource.disconnect(this);
     }
   }
 
@@ -236,7 +236,7 @@ export class CdkTable<T> implements CollectionViewer {
     this._data = [];
 
     if (this._dataSource) {
-      this.dataSource.disconnect();
+      this.dataSource.disconnect(this);
     }
     this._dataSource = dataSource;