fix(table): switch when arguments (#7516)

src/cdk/table/row.ts

@@ -84,12 +84,12 @@ export class CdkHeaderRowDef extends BaseRowDef {
 })
 export class CdkRowDef<T> extends BaseRowDef {
   /**
-   * Function that should return true if this row template should be used for the provided row data
-   * and index. If left undefined, this row will be considered the default row template to use when
-   * no other when functions return true for the data.
+   * Function that should return true if this row template should be used for the provided index
+   * and row data. If left undefined, this row will be considered the default row template to use
+   * when no other when functions return true for the data.
    * For every row, there must be at least one when function that passes or an undefined to default.
    */
-  when: (rowData: T, index: number) => boolean;
+  when: (index: number, rowData: T) => boolean;
 
   // TODO(andrewseguin): Add an input for providing a switch function to determine
   //   if this template should be used.

src/cdk/table/table.spec.ts

@@ -750,8 +750,8 @@ class BooleanRowCdkTableApp {
 class WhenRowCdkTableApp {
   dataSource: FakeDataSource = new FakeDataSource();
   columnsToRender = ['column_a', 'column_b', 'column_c'];
-  isIndex1 = (_rowData: TestData, index: number) => index == 1;
-  hasC3 = (rowData: TestData) => rowData.c == 'c_3';
+  isIndex1 = (index: number, _rowData: TestData) => index == 1;
+  hasC3 = (_index: number, rowData: TestData) => rowData.c == 'c_3';
 
   constructor() { this.dataSource.addData(); }
 
@@ -795,8 +795,8 @@ class WhenRowCdkTableApp {
 class WhenRowWithoutDefaultCdkTableApp {
   dataSource: FakeDataSource = new FakeDataSource();
   columnsToRender = ['column_a', 'column_b', 'column_c'];
-  isIndex1 = (_rowData: TestData, index: number) => index == 1;
-  hasC3 = (rowData: TestData) => rowData.c == 'c_3';
+  isIndex1 = (index: number, _rowData: TestData) => index == 1;
+  hasC3 = (_index: number, rowData: TestData) => rowData.c == 'c_3';
 
   @ViewChild(CdkTable) table: CdkTable<TestData>;
 }
@@ -839,8 +839,7 @@ class WhenRowWithoutDefaultCdkTableApp {
 class WhenRowMultipleDefaultsCdkTableApp {
   dataSource: FakeDataSource = new FakeDataSource();
   columnsToRender = ['column_a', 'column_b', 'column_c'];
-  isIndex1 = (_rowData: TestData, index: number) => index == 1;
-  hasC3 = (rowData: TestData) => rowData.c == 'c_3';
+  hasC3 = (_index: number, rowData: TestData) => rowData.c == 'c_3';
 
   @ViewChild(CdkTable) table: CdkTable<TestData>;
 }

src/cdk/table/table.ts

@@ -340,7 +340,7 @@ export class CdkTable<T> implements CollectionViewer {
   _getRowDef(data: T, i: number): CdkRowDef<T> {
     if (this._rowDefs.length == 1) { return this._rowDefs.first; }
 
-    let rowDef = this._rowDefs.find(def => def.when && def.when(data, i)) || this._defaultRowDef;
+    let rowDef = this._rowDefs.find(def => def.when && def.when(i, data)) || this._defaultRowDef;
     if (!rowDef) { throw getTableMissingMatchingRowDefError(); }
 
     return rowDef;

src/demo-app/table/table-demo.ts

@@ -45,7 +45,7 @@ export class TableDemo {
   @ViewChild(MatPaginator) paginator: MatPaginator;
   @ViewChild(MatSort) sort: MatSort;
 
-  isDetailRow = (row: DetailRow|UserData) => row.hasOwnProperty('detailRow');
+  isDetailRow = (_index: number, row: DetailRow|UserData) => row.hasOwnProperty('detailRow');
 
   @ViewChild('paginatorForDataSource') paginatorForDataSource: MatPaginator;
   @ViewChild('sortForDataSource') sortForDataSource: MatSort;

src/lib/table/table.spec.ts

@@ -285,7 +285,7 @@ class FakeDataSource extends DataSource<TestData> {
 class MatTableApp {
   dataSource: FakeDataSource | null = new FakeDataSource();
   columnsToRender = ['column_a', 'column_b', 'column_c'];
-  isFourthRow = (_rowData: TestData, i: number) => i == 3;
+  isFourthRow = (i: number, _rowData: TestData) => i == 3;
 
   @ViewChild(MatTable) table: MatTable<TestData>;
 }
@@ -311,7 +311,7 @@ class MatTableApp {
 })
 class MatTableWithWhenRowApp {
   dataSource: FakeDataSource | null = new FakeDataSource();
-  isFourthRow = (_rowData: TestData, i: number) => i == 3;
+  isFourthRow = (i: number, _rowData: TestData) => i == 3;
 
   @ViewChild(MatTable) table: MatTable<TestData>;
 }