[Gallery] Add options to tabs demo

gallery/gallery/lib/data/demos.dart

@@ -524,11 +524,18 @@ List<GalleryDemo> materialDemos(BuildContext context) {
       subtitle: localizations.demoTabsSubtitle,
       configurations: [
         GalleryDemoConfiguration(
-          title: localizations.demoTabsTitle,
+          title: localizations.demoTabsScrollingTitle,
           description: localizations.demoTabsDescription,
-          documentationUrl: '$_docsBaseUrl/material/TabBarView-class.html',
-          buildRoute: (context) => TabsDemo(),
-          code: CodeSegments.tabsDemo,
+          documentationUrl: '$_docsBaseUrl/material/TabBar-class.html',
+          buildRoute: (context) => TabsDemo(type: TabsDemoType.scrollable),
+          code: CodeSegments.tabsScrollableDemo,
+        ),
+        GalleryDemoConfiguration(
+          title: localizations.demoTabsNonScrollingTitle,
+          description: localizations.demoTabsDescription,
+          documentationUrl: '$_docsBaseUrl/material/TabBar-class.html',
+          buildRoute: (context) => TabsDemo(type: TabsDemoType.nonScrollable),
+          code: CodeSegments.tabsNonScrollableDemo,
         ),
       ],
     ),

gallery/gallery/lib/demos/material/tabs_demo.dart

@@ -5,9 +5,33 @@
 import 'package:flutter/material.dart';
 import 'package:gallery/l10n/gallery_localizations.dart';
 
-// BEGIN tabsDemo
+enum TabsDemoType {
+  scrollable,
+  nonScrollable,
+}
 
 class TabsDemo extends StatelessWidget {
+  const TabsDemo({Key key, this.type}) : super(key: key);
+
+  final TabsDemoType type;
+
+  @override
+  Widget build(BuildContext context) {
+    Widget tabs;
+    switch (type) {
+      case TabsDemoType.scrollable:
+        tabs = _TabsScrollableDemo();
+        break;
+      case TabsDemoType.nonScrollable:
+        tabs = _TabsNonScrollableDemo();
+    }
+    return tabs;
+  }
+}
+
+// BEGIN tabsScrollableDemo
+
+class _TabsScrollableDemo extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     List<String> tabs = [
@@ -17,14 +41,20 @@ class TabsDemo extends StatelessWidget {
       GalleryLocalizations.of(context).colorsBlue,
       GalleryLocalizations.of(context).colorsIndigo,
       GalleryLocalizations.of(context).colorsPurple,
+      GalleryLocalizations.of(context).colorsRed,
+      GalleryLocalizations.of(context).colorsOrange,
+      GalleryLocalizations.of(context).colorsGreen,
+      GalleryLocalizations.of(context).colorsBlue,
+      GalleryLocalizations.of(context).colorsIndigo,
+      GalleryLocalizations.of(context).colorsPurple,
     ];
 
     return DefaultTabController(
       length: tabs.length,
       child: Scaffold(
         appBar: AppBar(
           automaticallyImplyLeading: false,
-          title: Text(GalleryLocalizations.of(context).demoTabsTitle),
+          title: Text(GalleryLocalizations.of(context).demoTabsScrollingTitle),
           bottom: TabBar(
             isScrollable: true,
             tabs: [
@@ -46,3 +76,43 @@ class TabsDemo extends StatelessWidget {
 }
 
 // END
+
+// BEGIN tabsNonScrollableDemo
+
+class _TabsNonScrollableDemo extends StatelessWidget {
+  @override
+  Widget build(BuildContext context) {
+    List<String> tabs = [
+      GalleryLocalizations.of(context).colorsRed,
+      GalleryLocalizations.of(context).colorsOrange,
+      GalleryLocalizations.of(context).colorsGreen,
+    ];
+
+    return DefaultTabController(
+      length: tabs.length,
+      child: Scaffold(
+        appBar: AppBar(
+          automaticallyImplyLeading: false,
+          title:
+              Text(GalleryLocalizations.of(context).demoTabsNonScrollingTitle),
+          bottom: TabBar(
+            isScrollable: false,
+            tabs: [
+              for (final tab in tabs) Tab(text: tab),
+            ],
+          ),
+        ),
+        body: TabBarView(
+          children: [
+            for (final tab in tabs)
+              Center(
+                child: Text(tab),
+              ),
+          ],
+        ),
+      ),
+    );
+  }
+}
+
+// END

gallery/gallery/lib/l10n/gallery_localizations.dart

@@ -2969,6 +2969,21 @@ class GalleryLocalizations {
         desc: r'Description for tabs demo.');
   }
 
+  String get demoTabsNonScrollingTitle {
+    return Intl.message('Non-scrolling',
+        locale: _localeName,
+        name: 'demoTabsNonScrollingTitle',
+        desc:
+            r'Title for tabs demo with a tab bar that doesn' "'" r't scroll.');
+  }
+
+  String get demoTabsScrollingTitle {
+    return Intl.message('Scrolling',
+        locale: _localeName,
+        name: 'demoTabsScrollingTitle',
+        desc: r'Title for tabs demo with a tab bar that scrolls.');
+  }
+
   String get demoTabsSubtitle {
     return Intl.message('Tabs with independently scrollable views',
         locale: _localeName,

gallery/gallery/lib/l10n/intl_en_US.arb

@@ -1390,6 +1390,14 @@
   "@demoTabsTitle": {
     "description": "Title for tabs demo."
   },
+  "demoTabsScrollingTitle": "Scrolling",
+  "@demoTabsScrollingTitle": {
+    "description": "Title for tabs demo with a tab bar that scrolls."
+  },
+  "demoTabsNonScrollingTitle": "Non-scrolling",
+  "@demoTabsNonScrollingTitle": {
+    "description": "Title for tabs demo with a tab bar that doesn't scroll."
+  },
   "demoTabsSubtitle": "Tabs with independently scrollable views",
   "@demoTabsSubtitle": {
     "description": "Subtitle for tabs demo."

gallery/gallery/lib/l10n/intl_en_US.xml

@@ -1313,6 +1313,14 @@
     name="demoTabsTitle"
     description="Title for tabs demo."
     >Tabs</string>
+  <string
+    name="demoTabsScrollingTitle"
+    description="Title for tabs demo with a tab bar that scrolls."
+    >Scrolling</string>
+  <string
+    name="demoTabsNonScrollingTitle"
+    description="Title for tabs demo with a tab bar that doesn&apos;t scroll."
+    >Non-scrolling</string>
   <string
     name="demoTabsSubtitle"
     description="Subtitle for tabs demo."

gallery/gallery/lib/l10n/messages_en_US.dart

@@ -775,6 +775,10 @@ class MessageLookup extends MessageLookupByLibrary {
         "demoSnackbarsTitle": MessageLookupByLibrary.simpleMessage("Snackbars"),
         "demoTabsDescription": MessageLookupByLibrary.simpleMessage(
             "Tabs organize content across different screens, data sets, and other interactions."),
+        "demoTabsNonScrollingTitle":
+            MessageLookupByLibrary.simpleMessage("Non-scrolling"),
+        "demoTabsScrollingTitle":
+            MessageLookupByLibrary.simpleMessage("Scrolling"),
         "demoTabsSubtitle": MessageLookupByLibrary.simpleMessage(
             "Tabs with independently scrollable views"),
         "demoTabsTitle": MessageLookupByLibrary.simpleMessage("Tabs"),