localize a11y tab labels in the TabBar (#13714)

* localize a11y tab labels in the TabBar * break import cycle * test boilerplate * fix German translation * more test boilerplate fixes

localize a11y tab labels in the TabBar (#13714)
* localize a11y tab labels in the TabBar * break import cycle * test boilerplate * fix German translation * more test boilerplate fixes
291602db · Yegor · GitHub · 68736081 · 291602db · 291602db
Unverified Commit 291602db authored Dec 21, 2017 by Yegor Committed by GitHub Dec 21, 2017
27 changed files
--- a/packages/flutter/lib/src/material/material_localizations.dart
+++ b/packages/flutter/lib/src/material/material_localizations.dart
@@ -85,6 +85,14 @@ abstract class MaterialLocalizations {
  /// Title for the [PaginatedDataTable]'s "rows per page" footer.
  String get rowsPerPageTitle;
+  /// The accessibility label used on a tab in a [TabBar].
+  ///
+  /// This message describes the index of the selected tab and how many tabs
+  /// there are, e.g. 'Tab 1 of 2' in United States English.
+  ///
+  /// `tabIndex` and `tabCount` must be greater than or equal to one.
+  String tabLabel({int tabIndex, int tabCount});
  /// Title for the [PaginatedDataTable]'s selected row count header.
  String selectedRowCountTitle(int selectedRowCount);
@@ -517,6 +525,13 @@ class DefaultMaterialLocalizations implements MaterialLocalizations {
  @override
  String get rowsPerPageTitle => 'Rows per page:';
+  @override
+  String tabLabel({int tabIndex, int tabCount}) {
+    assert(tabIndex >= 1);
+    assert(tabCount >= 1);
+    return 'Tab $tabIndex of $tabCount';
+  }
  @override
  String selectedRowCountTitle(int selectedRowCount) {
    switch (selectedRowCount) {

--- a/packages/flutter/lib/src/material/tabs.dart
+++ b/packages/flutter/lib/src/material/tabs.dart
@@ -16,6 +16,7 @@ import 'constants.dart';
 import 'debug.dart';
 import 'ink_well.dart';
 import 'material.dart';
+import 'material_localizations.dart';
 import 'tab_controller.dart';
 import 'theme.dart';
@@ -747,6 +748,7 @@ class _TabBarState extends State<TabBar> {
  @override
  Widget build(BuildContext context) {
+    final MaterialLocalizations localizations = MaterialLocalizations.of(context);
    if (_controller.length == 0) {
      return new Container(
        height: _kTabHeight + widget.indicatorWeight,
@@ -811,8 +813,7 @@ class _TabBarState extends State<TabBar> {
              wrappedTabs[index],
              new Semantics(
                selected: index == _currentIndex,
-                // TODO(goderbauer): I10N-ify
+                label: localizations.tabLabel(tabIndex: index + 1, tabCount: tabCount),
-                label: 'Tab ${index + 1} of $tabCount',
              ),
            ]
          ),

--- a/packages/flutter/test/material/app_bar_test.dart
+++ b/packages/flutter/test/material/app_bar_test.dart
@@ -8,33 +8,40 @@ import 'package:flutter/rendering.dart';
 import 'package:flutter_test/flutter_test.dart';
 Widget buildSliverAppBarApp({ bool floating, bool pinned, double expandedHeight, bool snap: false }) {
-  return new Directionality(
+  return new Localizations(
-    textDirection: TextDirection.ltr,
+    locale: const Locale('en', 'US'),
-    child: new MediaQuery(
+    delegates: <LocalizationsDelegate<dynamic>>[
-      data: const MediaQueryData(),
+      DefaultMaterialLocalizations.delegate,
-      child: new Scaffold(
+      DefaultWidgetsLocalizations.delegate,
-        body: new DefaultTabController(
+    ],
-          length: 3,
+    child: new Directionality(
-          child: new CustomScrollView(
+      textDirection: TextDirection.ltr,
-            primary: true,
+      child: new MediaQuery(
-            slivers: <Widget>[
+        data: const MediaQueryData(),
-              new SliverAppBar(
+        child: new Scaffold(
-                title: const Text('AppBar Title'),
+          body: new DefaultTabController(
-                floating: floating,
+            length: 3,
-                pinned: pinned,
+            child: new CustomScrollView(
-                expandedHeight: expandedHeight,
+              primary: true,
-                snap: snap,
+              slivers: <Widget>[
-                bottom: new TabBar(
+                new SliverAppBar(
-                  tabs: <String>['A','B','C'].map((String t) => new Tab(text: 'TAB $t')).toList(),
+                  title: const Text('AppBar Title'),
+                  floating: floating,
+                  pinned: pinned,
+                  expandedHeight: expandedHeight,
+                  snap: snap,
+                  bottom: new TabBar(
+                    tabs: <String>['A','B','C'].map((String t) => new Tab(text: 'TAB $t')).toList(),
+                  ),
                ),
-              ),
+                new SliverToBoxAdapter(
-              new SliverToBoxAdapter(
+                  child: new Container(
-                child: new Container(
+                    height: 1200.0,
-                  height: 1200.0,
+                    color: Colors.orange[400],
-                  color: Colors.orange[400],
+                  ),
                ),
-              ),
+              ],
-            ],
+            ),
          ),
        ),
      ),

--- a/packages/flutter/test/material/tabs_test.dart
+++ b/packages/flutter/test/material/tabs_test.dart
@@ -15,10 +15,17 @@ import '../rendering/recording_canvas.dart';
 import '../widgets/semantics_tester.dart';
 Widget boilerplate({ Widget child, TextDirection textDirection: TextDirection.ltr }) {
-  return new Directionality(
+  return new Localizations(
-    textDirection: textDirection,
+    locale: const Locale('en', 'US'),
-    child: new Material(
+    delegates: <LocalizationsDelegate<dynamic>>[
-      child: child,
+      DefaultMaterialLocalizations.delegate,
+      DefaultWidgetsLocalizations.delegate,
+    ],
+    child: new Directionality(
+      textDirection: textDirection,
+      child: new Material(
+        child: child,
+      ),
    ),
  );
 }

--- a/packages/flutter/test/widgets/nested_scroll_view_test.dart
+++ b/packages/flutter/test/widgets/nested_scroll_view_test.dart
@@ -21,75 +21,82 @@ class _CustomPhysics extends ClampingScrollPhysics {
 }
 Widget buildTest({ ScrollController controller, String title:'TTTTTTTT' }) {
-  return new Directionality(
+  return new Localizations(
-    textDirection: TextDirection.ltr,
+    locale: const Locale('en', 'US'),
-    child: new MediaQuery(
+    delegates: <LocalizationsDelegate<dynamic>>[
-      data: const MediaQueryData(),
+      DefaultMaterialLocalizations.delegate,
-      child: new Scaffold(
+      DefaultWidgetsLocalizations.delegate,
-        body: new DefaultTabController(
+    ],
-          length: 4,
+    child: new Directionality(
-          child: new NestedScrollView(
+      textDirection: TextDirection.ltr,
-            controller: controller,
+      child: new MediaQuery(
-            headerSliverBuilder: (BuildContext context, bool innerBoxIsScrolled) {
+        data: const MediaQueryData(),
-              return <Widget>[
+        child: new Scaffold(
-                new SliverAppBar(
+          body: new DefaultTabController(
-                  title: new Text(title),
+            length: 4,
-                  pinned: true,
+            child: new NestedScrollView(
-                  expandedHeight: 200.0,
+              controller: controller,
-                  forceElevated: innerBoxIsScrolled,
+              headerSliverBuilder: (BuildContext context, bool innerBoxIsScrolled) {
-                  bottom: const TabBar(
+                return <Widget>[
-                    tabs: const <Tab>[
+                  new SliverAppBar(
-                      const Tab(text: 'AA'),
+                    title: new Text(title),
-                      const Tab(text: 'BB'),
+                    pinned: true,
-                      const Tab(text: 'CC'),
+                    expandedHeight: 200.0,
-                      const Tab(text: 'DD'),
+                    forceElevated: innerBoxIsScrolled,
+                    bottom: const TabBar(
+                      tabs: const <Tab>[
+                        const Tab(text: 'AA'),
+                        const Tab(text: 'BB'),
+                        const Tab(text: 'CC'),
+                        const Tab(text: 'DD'),
+                      ],
+                    ),
+                  ),
+                ];
+              },
+              body: new TabBarView(
+                children: <Widget>[
+                  new ListView(
+                    children: <Widget>[
+                      new Container(
+                        height: 300.0,
+                        child: const Text('aaa1'),
+                      ),
+                      new Container(
+                        height: 200.0,
+                        child: const Text('aaa2'),
+                      ),
+                      new Container(
+                        height: 100.0,
+                        child: const Text('aaa3'),
+                      ),
+                      new Container(
+                        height: 50.0,
+                        child: const Text('aaa4'),
+                      ),
                    ],
                  ),
-                ),
+                  new ListView(
-              ];
+                    children: <Widget>[
-            },
+                      new Container(
-            body: new TabBarView(
+                        height: 100.0,
-              children: <Widget>[
+                        child: const Text('bbb1'),
-                new ListView(
+                      ),
-                  children: <Widget>[
+                    ],
-                    new Container(
+                  ),
-                      height: 300.0,
+                  new Container(
-                      child: const Text('aaa1'),
+                    child: const Center(child: const Text('ccc1')),
-                    ),
+                  ),
-                    new Container(
+                  new ListView(
-                      height: 200.0,
+                    children: <Widget>[
-                      child: const Text('aaa2'),
+                      new Container(
-                    ),
+                        height: 10000.0,
-                    new Container(
+                        child: const Text('ddd1'),
-                      height: 100.0,
+                      ),
-                      child: const Text('aaa3'),
+                    ],
-                    ),
+                  ),
-                    new Container(
+                ],
-                      height: 50.0,
+              ),
-                      child: const Text('aaa4'),
-                    ),
-                  ],
-                ),
-                new ListView(
-                  children: <Widget>[
-                    new Container(
-                      height: 100.0,
-                      child: const Text('bbb1'),
-                    ),
-                  ],
-                ),
-                new Container(
-                  child: const Center(child: const Text('ccc1')),
-                ),
-                new ListView(
-                  children: <Widget>[
-                    new Container(
-                      height: 10000.0,
-                      child: const Text('ddd1'),
-                    ),
-                  ],
-                ),
-              ],
            ),
          ),
        ),

--- a/packages/flutter_localizations/lib/src/l10n/localizations.dart
+++ b/packages/flutter_localizations/lib/src/l10n/localizations.dart
@@ -39,6 +39,7 @@ class TranslationBundle {
  String get pageRowsInfoTitle => parent?.pageRowsInfoTitle;
  String get pageRowsInfoTitleApproximate => parent?.pageRowsInfoTitleApproximate;
  String get rowsPerPageTitle => parent?.rowsPerPageTitle;
+  String get tabLabel => parent?.tabLabel;
  String get selectedRowCountTitleOther => parent?.selectedRowCountTitleOther;
  String get cancelButtonLabel => parent?.cancelButtonLabel;
  String get closeButtonLabel => parent?.closeButtonLabel;
@@ -83,6 +84,7 @@ class _Bundle_ar extends TranslationBundle {
  @override String get pageRowsInfoTitle => r'من $firstRow إلى $lastRow من إجمالي $rowCount';
  @override String get pageRowsInfoTitleApproximate => r'من $firstRow إلى $lastRow من إجمالي $rowCount تقريبًا';
  @override String get rowsPerPageTitle => r'عدد الصفوف في الصفحة:';
+  @override String get tabLabel => r'من $tabIndex من إجمالي $tabCount';
  @override String get selectedRowCountTitleOther => r'تم اختيار $selectedRowCount عنصر';
  @override String get cancelButtonLabel => r'إلغاء';
  @override String get closeButtonLabel => r'إغلاق';
@@ -122,6 +124,7 @@ class _Bundle_de extends TranslationBundle {
  @override String get pageRowsInfoTitle => r'$firstRow–$lastRow von $rowCount';
  @override String get pageRowsInfoTitleApproximate => r'$firstRow–$lastRow von etwa $rowCount';
  @override String get rowsPerPageTitle => r'Zeilen pro Seite:';
+  @override String get tabLabel => r'Tabulator $tabIndex von $tabCount';
  @override String get selectedRowCountTitleZero => r'Keine Objekte ausgewählt';
  @override String get selectedRowCountTitleOne => r'1 Element ausgewählt';
  @override String get selectedRowCountTitleOther => r'$selectedRowCount Elemente ausgewählt';
@@ -163,6 +166,7 @@ class _Bundle_en extends TranslationBundle {
  @override String get pageRowsInfoTitle => r'$firstRow–$lastRow of $rowCount';
  @override String get pageRowsInfoTitleApproximate => r'$firstRow–$lastRow of about $rowCount';
  @override String get rowsPerPageTitle => r'Rows per page:';
+  @override String get tabLabel => r'Tab $tabIndex of $tabCount';
  @override String get selectedRowCountTitleZero => r'No items selected';
  @override String get selectedRowCountTitleOne => r'1 item selected';
  @override String get selectedRowCountTitleOther => r'$selectedRowCount items selected';
@@ -204,6 +208,7 @@ class _Bundle_es extends TranslationBundle {
  @override String get pageRowsInfoTitle => r'$firstRow‑$lastRow de $rowCount';
  @override String get pageRowsInfoTitleApproximate => r'$firstRow‑$lastRow de aproximadamente $rowCount';
  @override String get rowsPerPageTitle => r'Filas por página:';
+  @override String get tabLabel => r'$tabIndex de $tabCount';
  @override String get selectedRowCountTitleZero => r'No se han seleccionado elementos';
  @override String get selectedRowCountTitleOne => r'1 elemento seleccionado';
  @override String get selectedRowCountTitleOther => r'$selectedRowCount elementos seleccionados';
@@ -246,6 +251,7 @@ class _Bundle_fa extends TranslationBundle {
  @override String get pageRowsInfoTitle => r'$firstRow–$lastRow از $rowCount';
  @override String get pageRowsInfoTitleApproximate => r'$firstRow–$lastRow از حدود $rowCount';
  @override String get rowsPerPageTitle => r'ردیف در هر صفحه:';
+  @override String get tabLabel => r'$tabIndex از $tabCount';
  @override String get selectedRowCountTitleOther => r'$selectedRowCount مورد انتخاب شدند';
  @override String get cancelButtonLabel => r'لغو';
  @override String get closeButtonLabel => r'بستن';
@@ -285,6 +291,7 @@ class _Bundle_fr extends TranslationBundle {
  @override String get pageRowsInfoTitle => r'$firstRow – $lastRow sur $rowCount';
  @override String get pageRowsInfoTitleApproximate => r'$firstRow – $lastRow sur environ $rowCount';
  @override String get rowsPerPageTitle => r'Lignes par page :';
+  @override String get tabLabel => r'$tabIndex sur $tabCount';
  @override String get selectedRowCountTitleZero => r'Aucun élément sélectionné';
  @override String get selectedRowCountTitleOne => r'1 élément sélectionné';
  @override String get selectedRowCountTitleOther => r'$selectedRowCount éléments sélectionnés';
@@ -366,6 +373,7 @@ class _Bundle_he extends TranslationBundle {
  @override String get pageRowsInfoTitle => r'$lastRow–$firstRow מתוך $rowCount';
  @override String get pageRowsInfoTitleApproximate => r'$lastRow–$firstRow מתוך כ-$rowCount';
  @override String get rowsPerPageTitle => r'שורות בכל דף:';
+  @override String get tabLabel => r'$tabIndex מתוך $tabCount';
  @override String get selectedRowCountTitleOther => r'$selectedRowCount פריטים נבחרו';
  @override String get cancelButtonLabel => r'ביטול';
  @override String get closeButtonLabel => r'סגירה';
@@ -406,6 +414,7 @@ class _Bundle_it extends TranslationBundle {
  @override String get pageRowsInfoTitle => r'$firstRow-$lastRow di $rowCount';
  @override String get pageRowsInfoTitleApproximate => r'$firstRow-$lastRow di circa $rowCount';
  @override String get rowsPerPageTitle => r'Righe per pagina:';
+  @override String get tabLabel => r'$tabIndex di $tabCount';
  @override String get selectedRowCountTitleOther => r'$selectedRowCount elementi selezionati';
  @override String get cancelButtonLabel => r'ANNULLA';
  @override String get closeButtonLabel => r'CHIUDI';
@@ -446,6 +455,7 @@ class _Bundle_ja extends TranslationBundle {
  @override String get pageRowsInfoTitle => r'$firstRow - $lastRow 行（合計 $rowCount 行）';
  @override String get pageRowsInfoTitleApproximate => r'$firstRow – $lastRow 行（合計約 $rowCount 行）';
  @override String get rowsPerPageTitle => r'ページあたりの行数:';
+  @override String get tabLabel => r'$tabIndex 行（合計 $tabCount 行）';
  @override String get selectedRowCountTitleOther => r'$selectedRowCount 件のアイテムを選択中';
  @override String get cancelButtonLabel => r'キャンセル';
  @override String get closeButtonLabel => r'閉じる';
@@ -485,6 +495,7 @@ class _Bundle_ko extends TranslationBundle {
  @override String get pageRowsInfoTitle => r'$rowCount행 중 $firstRow~$lastRow행';
  @override String get pageRowsInfoTitleApproximate => r'약 $rowCount행 중 $firstRow~$lastRow행';
  @override String get rowsPerPageTitle => r'페이지당 행 수:';
+  @override String get tabLabel => r'$tabCount행 중 $tabIndex행';
  @override String get selectedRowCountTitleOne => r'항목 1개 선택됨';
  @override String get selectedRowCountTitleOther => r'항목 $selectedRowCount개 선택됨';
  @override String get cancelButtonLabel => r'취소';
@@ -525,6 +536,7 @@ class _Bundle_nl extends TranslationBundle {
  @override String get pageRowsInfoTitle => r'$firstRow-$lastRow van $rowCount';
  @override String get pageRowsInfoTitleApproximate => r'$firstRow-$lastRow van ongeveer $rowCount';
  @override String get rowsPerPageTitle => r'Rijen per pagina:';
+  @override String get tabLabel => r'$tabIndex van $tabCount';
  @override String get selectedRowCountTitleOne => r'1 item geselecteerd';
  @override String get selectedRowCountTitleOther => r'$selectedRowCount items geselecteerd';
  @override String get cancelButtonLabel => r'ANNULEREN';
@@ -567,6 +579,7 @@ class _Bundle_pl extends TranslationBundle {
  @override String get pageRowsInfoTitle => r'$firstRow–$lastRow z $rowCount';
  @override String get pageRowsInfoTitleApproximate => r'$firstRow–$lastRow z około $rowCount';
  @override String get rowsPerPageTitle => r'Wiersze na stronie:';
+  @override String get tabLabel => r'$tabIndex z $tabCount';
  @override String get selectedRowCountTitleOne => r'1 wybrany element';
  @override String get selectedRowCountTitleOther => r'$selectedRowCount wybranego elementu';
  @override String get cancelButtonLabel => r'ANULUJ';
@@ -607,6 +620,7 @@ class _Bundle_ps extends TranslationBundle {
  @override String get pageRowsInfoTitle => r'$firstRow–$lastRow د $rowCount';
  @override String get pageRowsInfoTitleApproximate => r'$firstRow–$lastRow څخه $rowCount د';
  @override String get rowsPerPageTitle => r'د هرې پاڼې پاڼې:';
+  @override String get tabLabel => r'$tabIndex د $tabCount';
  @override String get selectedRowCountTitleOther => r'$selectedRowCount توکي غوره شوي';
  @override String get cancelButtonLabel => r'لغوه کول';
  @override String get closeButtonLabel => r'تړل';
@@ -647,6 +661,7 @@ class _Bundle_pt extends TranslationBundle {
  @override String get pageRowsInfoTitle => r'$firstRow – $lastRow de $rowCount';
  @override String get pageRowsInfoTitleApproximate => r'$firstRow – $lastRow de aproximadamente $rowCount';
  @override String get rowsPerPageTitle => r'Linhas por página:';
+  @override String get tabLabel => r'$tabIndex de $tabCount';
  @override String get selectedRowCountTitleOther => r'$selectedRowCount itens selecionados';
  @override String get cancelButtonLabel => r'CANCELAR';
  @override String get closeButtonLabel => r'FECHAR';
@@ -684,6 +699,7 @@ class _Bundle_ru extends TranslationBundle {
  @override String get pageRowsInfoTitle => r'$firstRow–$lastRow из $rowCount';
  @override String get pageRowsInfoTitleApproximate => r'$firstRow–$lastRow из примерно $rowCount';
  @override String get rowsPerPageTitle => r'Строк на странице:';
+  @override String get tabLabel => r'Закладка $tabIndex из $tabCount';
  @override String get aboutListTileTitle => r'$applicationName: сведения';
  @override String get licensesPageTitle => r'Лицензии';
  @override String get selectedRowCountTitleZero => r'Строки не выбраны';
@@ -727,6 +743,7 @@ class _Bundle_th extends TranslationBundle {
  @override String get pageRowsInfoTitle => r'$firstRow-$lastRow จาก $rowCount';
  @override String get pageRowsInfoTitleApproximate => r'$firstRow–$lastRow จากประมาณ $rowCount';
  @override String get rowsPerPageTitle => r'แถวต่อหน้า:';
+  @override String get tabLabel => r'$tabIndex จาก $tabCount';
  @override String get selectedRowCountTitleOne => r'เลือกแล้ว 1 รายการ';
  @override String get selectedRowCountTitleOther => r'เลือกแล้ว $selectedRowCount รายการ';
  @override String get cancelButtonLabel => r'ยกเลิก';
@@ -767,6 +784,7 @@ class _Bundle_tr extends TranslationBundle {
  @override String get pageRowsInfoTitle => r'$firstRow-$lastRow / $rowCount';
  @override String get pageRowsInfoTitleApproximate => r'$firstRow-$lastRow / $rowCount';
  @override String get rowsPerPageTitle => r'Sayfa başına satır sayısı:';
+  @override String get tabLabel => r'$tabIndex, $tabCount içinde';
  @override String get selectedRowCountTitleOne => r'1 öğe seçildi';
  @override String get selectedRowCountTitleOther => r'$selectedRowCount öğe seçildi';
  @override String get cancelButtonLabel => r'İPTAL';
@@ -808,6 +826,7 @@ class _Bundle_ur extends TranslationBundle {
  @override String get pageRowsInfoTitle => r'$firstRow–$lastRow از $rowCount';
  @override String get pageRowsInfoTitleApproximate => r'$firstRow–$lastRow $rowCount میں سے تقریباً';
  @override String get rowsPerPageTitle => r'قطاریں فی صفحہ:';
+  @override String get tabLabel => r'$tabIndex از $tabCount';
  @override String get selectedRowCountTitleOther => r'$selectedRowCount آئٹمز منتخب کیے گئے';
  @override String get cancelButtonLabel => r'منسوخ کریں';
  @override String get closeButtonLabel => r'بند کریں';
@@ -844,6 +863,7 @@ class _Bundle_zh extends TranslationBundle {
  @override String get pageRowsInfoTitle => r'第 $firstRow-$lastRow 行（共 $rowCount 行）';
  @override String get pageRowsInfoTitleApproximate => r'第 $firstRow-$lastRow 行（共约 $rowCount 行）';
  @override String get rowsPerPageTitle => r'每页行数：';
+  @override String get tabLabel => r'第 $tabIndex 行（共 $tabCount 行）';
  @override String get selectedRowCountTitleOther => r'已选择 $selectedRowCount 项内容';
  @override String get cancelButtonLabel => r'取消';
  @override String get continueButtonLabel => r'继续';

--- a/packages/flutter_localizations/lib/src/l10n/material_ar.arb
+++ b/packages/flutter_localizations/lib/src/l10n/material_ar.arb
@@ -20,6 +20,7 @@
  "pageRowsInfoTitle": "من $firstRow إلى $lastRow من إجمالي $rowCount",
  "pageRowsInfoTitleApproximate": "من $firstRow إلى $lastRow من إجمالي $rowCount تقريبًا",
  "rowsPerPageTitle": "عدد الصفوف في الصفحة:",
+  "tabLabel": "من $tabIndex من إجمالي $tabCount",
  "selectedRowCountTitleOther": "تم اختيار $selectedRowCount عنصر",
  "cancelButtonLabel": "إلغاء",
  "closeButtonLabel": "إغلاق",

--- a/packages/flutter_localizations/lib/src/l10n/material_de.arb
+++ b/packages/flutter_localizations/lib/src/l10n/material_de.arb
@@ -15,6 +15,7 @@
  "pageRowsInfoTitle": "$firstRow–$lastRow von $rowCount",
  "pageRowsInfoTitleApproximate": "$firstRow–$lastRow von etwa $rowCount",
  "rowsPerPageTitle": "Zeilen pro Seite:",
+  "tabLabel": "Tabulator $tabIndex von $tabCount",
  "selectedRowCountTitleZero": "Keine Objekte ausgewählt",
  "selectedRowCountTitleOne": "1 Element ausgewählt",
  "selectedRowCountTitleOther": "$selectedRowCount Elemente ausgewählt",

--- a/packages/flutter_localizations/lib/src/l10n/material_en.arb
+++ b/packages/flutter_localizations/lib/src/l10n/material_en.arb
@@ -82,6 +82,12 @@
    "description": "The caption for the drop-down button on a paginated data table's footer that allows the user to control the number of rows of data per page of the table."
  },
+  "tabLabel": "Tab $tabIndex of $tabCount",
+  "@tabLabel": {
+    "description": "The accessibility label used on a tab. This message describes the index of the selected tab and how many tabs there are, e.g. 'Tab 1 of 2'. All values are greater than or equal to one.",
+    "parameters": "tabIndex, tabCount"
+  },
  "selectedRowCountTitleZero": "No items selected",
  "selectedRowCountTitleOne": "1 item selected",
  "selectedRowCountTitleOther": "$selectedRowCount items selected",

--- a/packages/flutter_localizations/lib/src/l10n/material_es.arb
+++ b/packages/flutter_localizations/lib/src/l10n/material_es.arb
@@ -15,6 +15,7 @@
  "pageRowsInfoTitle": "$firstRow‑$lastRow de $rowCount",
  "pageRowsInfoTitleApproximate": "$firstRow‑$lastRow de aproximadamente $rowCount",
  "rowsPerPageTitle": "Filas por página:",
+  "tabLabel": "$tabIndex de $tabCount",
  "selectedRowCountTitleZero": "No se han seleccionado elementos",
  "selectedRowCountTitleOne": "1 elemento seleccionado",
  "selectedRowCountTitleOther": "$selectedRowCount elementos seleccionados",

--- a/packages/flutter_localizations/lib/src/l10n/material_fa.arb
+++ b/packages/flutter_localizations/lib/src/l10n/material_fa.arb
@@ -16,6 +16,7 @@
  "pageRowsInfoTitle": "$firstRow–$lastRow از $rowCount",
  "pageRowsInfoTitleApproximate": "$firstRow–$lastRow از حدود $rowCount",
  "rowsPerPageTitle": "ردیف در هر صفحه:",
+  "tabLabel": "$tabIndex از $tabCount",
  "selectedRowCountTitleOther": "$selectedRowCount مورد انتخاب شدند",
  "cancelButtonLabel": "لغو",
  "closeButtonLabel": "بستن",

--- a/packages/flutter_localizations/lib/src/l10n/material_fr.arb
+++ b/packages/flutter_localizations/lib/src/l10n/material_fr.arb
@@ -15,6 +15,7 @@
  "pageRowsInfoTitle": "$firstRow – $lastRow sur $rowCount",
  "pageRowsInfoTitleApproximate": "$firstRow – $lastRow sur environ $rowCount",
  "rowsPerPageTitle": "Lignes par page :",
+  "tabLabel": "$tabIndex sur $tabCount",
  "selectedRowCountTitleZero": "Aucun élément sélectionné",
  "selectedRowCountTitleOne": "1 élément sélectionné",
  "selectedRowCountTitleOther": "$selectedRowCount éléments sélectionnés",

--- a/packages/flutter_localizations/lib/src/l10n/material_he.arb
+++ b/packages/flutter_localizations/lib/src/l10n/material_he.arb
@@ -18,6 +18,7 @@
  "pageRowsInfoTitle": "$lastRow–$firstRow מתוך $rowCount",
  "pageRowsInfoTitleApproximate": "$lastRow–$firstRow מתוך כ-$rowCount",
  "rowsPerPageTitle": "שורות בכל דף:",
+  "tabLabel": "$tabIndex מתוך $tabCount",
  "selectedRowCountTitleOther": "$selectedRowCount פריטים נבחרו",
  "cancelButtonLabel": "ביטול",
  "closeButtonLabel": "סגירה",

--- a/packages/flutter_localizations/lib/src/l10n/material_it.arb
+++ b/packages/flutter_localizations/lib/src/l10n/material_it.arb
@@ -16,6 +16,7 @@
  "pageRowsInfoTitle": "$firstRow-$lastRow di $rowCount",
  "pageRowsInfoTitleApproximate": "$firstRow-$lastRow di circa $rowCount",
  "rowsPerPageTitle": "Righe per pagina:",
+  "tabLabel": "$tabIndex di $tabCount",
  "selectedRowCountTitleOther": "$selectedRowCount elementi selezionati",
  "cancelButtonLabel": "ANNULLA",
  "closeButtonLabel": "CHIUDI",

--- a/packages/flutter_localizations/lib/src/l10n/material_ja.arb
+++ b/packages/flutter_localizations/lib/src/l10n/material_ja.arb
@@ -16,6 +16,7 @@
  "pageRowsInfoTitle": "$firstRow - $lastRow 行（合計 $rowCount 行）",
  "pageRowsInfoTitleApproximate": "$firstRow – $lastRow 行（合計約 $rowCount 行）",
  "rowsPerPageTitle": "ページあたりの行数:",
+  "tabLabel": "$tabIndex 行（合計 $tabCount 行）",
  "selectedRowCountTitleOther": "$selectedRowCount 件のアイテムを選択中",
  "cancelButtonLabel": "キャンセル",
  "closeButtonLabel": "閉じる",

--- a/packages/flutter_localizations/lib/src/l10n/material_ko.arb
+++ b/packages/flutter_localizations/lib/src/l10n/material_ko.arb
@@ -15,6 +15,7 @@
  "pageRowsInfoTitle": "$rowCount행 중 $firstRow~$lastRow행",
  "pageRowsInfoTitleApproximate": "약 $rowCount행 중 $firstRow~$lastRow행",
  "rowsPerPageTitle": "페이지당 행 수:",
+  "tabLabel": "$tabCount행 중 $tabIndex행",
  "selectedRowCountTitleOne": "항목 1개 선택됨",
  "selectedRowCountTitleOther": "항목 $selectedRowCount개 선택됨",
  "cancelButtonLabel": "취소",

--- a/packages/flutter_localizations/lib/src/l10n/material_nl.arb
+++ b/packages/flutter_localizations/lib/src/l10n/material_nl.arb
@@ -15,6 +15,7 @@
  "pageRowsInfoTitle": "$firstRow-$lastRow van $rowCount",
  "pageRowsInfoTitleApproximate": "$firstRow-$lastRow van ongeveer $rowCount",
  "rowsPerPageTitle": "Rijen per pagina:",
+  "tabLabel": "$tabIndex van $tabCount",
  "selectedRowCountTitleOne": "1 item geselecteerd",
  "selectedRowCountTitleOther": "$selectedRowCount items geselecteerd",
  "cancelButtonLabel": "ANNULEREN",

--- a/packages/flutter_localizations/lib/src/l10n/material_pl.arb
+++ b/packages/flutter_localizations/lib/src/l10n/material_pl.arb
@@ -17,6 +17,7 @@
  "pageRowsInfoTitle": "$firstRow–$lastRow z $rowCount",
  "pageRowsInfoTitleApproximate": "$firstRow–$lastRow z około $rowCount",
  "rowsPerPageTitle": "Wiersze na stronie:",
+  "tabLabel": "$tabIndex z $tabCount",
  "selectedRowCountTitleOne": "1 wybrany element",
  "selectedRowCountTitleOther": "$selectedRowCount wybranego elementu",
  "cancelButtonLabel": "ANULUJ",

--- a/packages/flutter_localizations/lib/src/l10n/material_ps.arb
+++ b/packages/flutter_localizations/lib/src/l10n/material_ps.arb
@@ -17,6 +17,7 @@
  "pageRowsInfoTitle": "$firstRow–$lastRow د $rowCount",
  "pageRowsInfoTitleApproximate": "$firstRow–$lastRow څخه $rowCount د",
  "rowsPerPageTitle": "د هرې پاڼې پاڼې:",
+  "tabLabel": "$tabIndex د $tabCount",
  "selectedRowCountTitleOther": "$selectedRowCount توکي غوره شوي",
  "cancelButtonLabel": "لغوه کول",
  "closeButtonLabel": "تړل",

--- a/packages/flutter_localizations/lib/src/l10n/material_pt.arb
+++ b/packages/flutter_localizations/lib/src/l10n/material_pt.arb
@@ -20,6 +20,7 @@
  "pageRowsInfoTitle": "$firstRow – $lastRow de $rowCount",
  "pageRowsInfoTitleApproximate": "$firstRow – $lastRow de aproximadamente $rowCount",
  "rowsPerPageTitle": "Linhas por página:",
+  "tabLabel": "$tabIndex de $tabCount",
  "selectedRowCountTitleOther": "$selectedRowCount itens selecionados",
  "cancelButtonLabel": "CANCELAR",
  "closeButtonLabel": "FECHAR",

--- a/packages/flutter_localizations/lib/src/l10n/material_ru.arb
+++ b/packages/flutter_localizations/lib/src/l10n/material_ru.arb
@@ -15,6 +15,7 @@
  "pageRowsInfoTitle": "$firstRow–$lastRow из $rowCount",
  "pageRowsInfoTitleApproximate": "$firstRow–$lastRow из примерно $rowCount",
  "rowsPerPageTitle": "Строк на странице:",
+  "tabLabel": "Закладка $tabIndex из $tabCount",
  "aboutListTileTitle": "$applicationName: сведения",
  "licensesPageTitle": "Лицензии",
  "selectedRowCountTitleZero": "Строки не выбраны",

--- a/packages/flutter_localizations/lib/src/l10n/material_th.arb
+++ b/packages/flutter_localizations/lib/src/l10n/material_th.arb
@@ -15,6 +15,7 @@
  "pageRowsInfoTitle": "$firstRow-$lastRow จาก $rowCount",
  "pageRowsInfoTitleApproximate": "$firstRow–$lastRow จากประมาณ $rowCount",
  "rowsPerPageTitle": "แถวต่อหน้า:",
+  "tabLabel": "$tabIndex จาก $tabCount",
  "selectedRowCountTitleOne": "เลือกแล้ว 1 รายการ",
  "selectedRowCountTitleOther": "เลือกแล้ว $selectedRowCount รายการ",
  "cancelButtonLabel": "ยกเลิก",

--- a/packages/flutter_localizations/lib/src/l10n/material_tr.arb
+++ b/packages/flutter_localizations/lib/src/l10n/material_tr.arb
@@ -15,6 +15,7 @@
  "pageRowsInfoTitle": "$firstRow-$lastRow / $rowCount",
  "pageRowsInfoTitleApproximate": "$firstRow-$lastRow / $rowCount",
  "rowsPerPageTitle": "Sayfa başına satır sayısı:",
+  "tabLabel": "$tabIndex, $tabCount içinde",
  "selectedRowCountTitleOne": "1 öğe seçildi",
  "selectedRowCountTitleOther": "$selectedRowCount öğe seçildi",
  "cancelButtonLabel": "İPTAL",

--- a/packages/flutter_localizations/lib/src/l10n/material_ur.arb
+++ b/packages/flutter_localizations/lib/src/l10n/material_ur.arb
@@ -16,6 +16,7 @@
  "pageRowsInfoTitle": "$firstRow–$lastRow از $rowCount",
  "pageRowsInfoTitleApproximate": "$firstRow–$lastRow $rowCount میں سے تقریباً",
  "rowsPerPageTitle": "قطاریں فی صفحہ:",
+  "tabLabel": "$tabIndex از $tabCount",
  "selectedRowCountTitleOther": "$selectedRowCount آئٹمز منتخب کیے گئے",
  "cancelButtonLabel": "منسوخ کریں",
  "closeButtonLabel": "بند کریں",

--- a/packages/flutter_localizations/lib/src/l10n/material_zh.arb
+++ b/packages/flutter_localizations/lib/src/l10n/material_zh.arb
@@ -12,6 +12,7 @@
  "pageRowsInfoTitle": "第 $firstRow-$lastRow 行（共 $rowCount 行）",
  "pageRowsInfoTitleApproximate": "第 $firstRow-$lastRow 行（共约 $rowCount 行）",
  "rowsPerPageTitle": "每页行数：",
+  "tabLabel": "第 $tabIndex 行（共 $tabCount 行）",
  "selectedRowCountTitleOther": "已选择 $selectedRowCount 项内容",
  "cancelButtonLabel": "取消",
  "continueButtonLabel": "继续",

--- a/packages/flutter_localizations/lib/src/material_localizations.dart
+++ b/packages/flutter_localizations/lib/src/material_localizations.dart
@@ -272,6 +272,16 @@ class GlobalMaterialLocalizations implements MaterialLocalizations {
  @override
  String get rowsPerPageTitle => _translationBundle.rowsPerPageTitle;
+  @override
+  String tabLabel({int tabIndex, int tabCount}) {
+    assert(tabIndex >= 1);
+    assert(tabCount >= 1);
+    final String template = _translationBundle.tabLabel;
+    return template
+      .replaceFirst(r'$tabIndex', formatDecimal(tabIndex))
+      .replaceFirst(r'tabCount', formatDecimal(tabCount));
+  }
  @override
  String selectedRowCountTitle(int selectedRowCount) {
    // TODO(hmuller): the rules for mapping from an integer value to

--- a/packages/flutter_localizations/test/translations_test.dart
+++ b/packages/flutter_localizations/test/translations_test.dart
@@ -61,19 +61,25 @@ void main() {
      expect(localizations.selectedRowCountTitle(1), isNotNull);
      expect(localizations.selectedRowCountTitle(2), isNotNull);
      expect(localizations.selectedRowCountTitle(100), isNotNull);
-      expect(localizations.selectedRowCountTitle(0).contains(r'$selectedRowCount'), isFalse);
+      expect(localizations.selectedRowCountTitle(0), isNot(contains(r'$selectedRowCount')));
-      expect(localizations.selectedRowCountTitle(1).contains(r'$selectedRowCount'), isFalse);
+      expect(localizations.selectedRowCountTitle(1), isNot(contains(r'$selectedRowCount')));
-      expect(localizations.selectedRowCountTitle(2).contains(r'$selectedRowCount'), isFalse);
+      expect(localizations.selectedRowCountTitle(2), isNot(contains(r'$selectedRowCount')));
-      expect(localizations.selectedRowCountTitle(100).contains(r'$selectedRowCount'), isFalse);
+      expect(localizations.selectedRowCountTitle(100), isNot(contains(r'$selectedRowCount')));
      expect(localizations.pageRowsInfoTitle(1, 10, 100, true), isNotNull);
      expect(localizations.pageRowsInfoTitle(1, 10, 100, false), isNotNull);
-      expect(localizations.pageRowsInfoTitle(1, 10, 100, true).contains(r'$firstRow'), isFalse);
+      expect(localizations.pageRowsInfoTitle(1, 10, 100, true), isNot(contains(r'$firstRow')));
-      expect(localizations.pageRowsInfoTitle(1, 10, 100, true).contains(r'$lastRow'), isFalse);
+      expect(localizations.pageRowsInfoTitle(1, 10, 100, true), isNot(contains(r'$lastRow')));
-      expect(localizations.pageRowsInfoTitle(1, 10, 100, true).contains(r'$rowCount'), isFalse);
+      expect(localizations.pageRowsInfoTitle(1, 10, 100, true), isNot(contains(r'$rowCount')));
-      expect(localizations.pageRowsInfoTitle(1, 10, 100, false).contains(r'$firstRow'), isFalse);
+      expect(localizations.pageRowsInfoTitle(1, 10, 100, false), isNot(contains(r'$firstRow')));
-      expect(localizations.pageRowsInfoTitle(1, 10, 100, false).contains(r'$lastRow'), isFalse);
+      expect(localizations.pageRowsInfoTitle(1, 10, 100, false), isNot(contains(r'$lastRow')));
-      expect(localizations.pageRowsInfoTitle(1, 10, 100, false).contains(r'$rowCount'), isFalse);
+      expect(localizations.pageRowsInfoTitle(1, 10, 100, false), isNot(contains(r'$rowCount')));
+      expect(localizations.tabLabel(tabIndex: 2, tabCount: 5), isNotNull);
+      expect(localizations.tabLabel(tabIndex: 2, tabCount: 5), isNot(contains('tabIndex')));
+      expect(localizations.tabLabel(tabIndex: 2, tabCount: 5), isNot(contains('tabCount')));
+      expect(() => localizations.tabLabel(tabIndex: 0, tabCount: 5), throwsAssertionError);
+      expect(() => localizations.tabLabel(tabIndex: 2, tabCount: 0), throwsAssertionError);
    });
  }