Expose page list, current page, and getters for isAtLastPage / isAtFirstPage

demo_ui_components/lib/demo_ui_components.dart

@@ -1,5 +1,6 @@
 export 'src/button/wolt_modal_sheet_back_button.dart';
 export 'src/button/wolt_circular_elevated_button.dart';
+export 'src/button/wolt_modal_sheet_close_or_next_sab.dart';
 export 'src/button/wolt_modal_sheet_close_button.dart';
 export 'src/button/wolt_elevated_button.dart';
 export 'src/colors/wolt_colors.dart';

demo_ui_components/lib/src/button/wolt_modal_sheet_close_or_next_sab.dart

@@ -0,0 +1,27 @@
+import 'package:demo_ui_components/demo_ui_components.dart';
+import 'package:flutter/material.dart';
+import 'package:wolt_modal_sheet/wolt_modal_sheet.dart';
+
+class WoltModalSheetCloseOrNextSab extends StatelessWidget {
+  const WoltModalSheetCloseOrNextSab({
+    this.colorName = WoltColorName.blue,
+    super.key,
+  });
+
+  final WoltColorName colorName;
+
+  @override
+  Widget build(BuildContext context) {
+    final totalPageCount = WoltModalSheet.of(context).pages.length;
+    final currentPageIndex = WoltModalSheet.of(context).currentPageIndex;
+    final bool isAtLastPage = WoltModalSheet.of(context).isAtLastPage;
+    return WoltElevatedButton(
+      onPressed: isAtLastPage
+          ? Navigator.of(context).pop
+          : WoltModalSheet.of(context).showNext,
+      child: Text(isAtLastPage
+          ? "Close"
+          : "Next (${currentPageIndex + 1}/$totalPageCount)"),
+    );
+  }
+}

lib/src/wolt_modal_sheet.dart

@@ -272,6 +272,21 @@ class WoltModalSheet<T> extends StatefulWidget {
 class WoltModalSheetState extends State<WoltModalSheet> {
   List<SliverWoltModalSheetPage> _pages = [];
 
+  /// The list of pages in the modal sheet.
+  List<SliverWoltModalSheetPage> get pages => _pages;
+
+  /// The current page displayed in the modal sheet.
+  SliverWoltModalSheetPage get currentPage => _pages[_currentPageIndex];
+
+  /// The index of the currently displayed page in the in-modal navigation stack.
+  int get currentPageIndex => _currentPageIndex;
+
+  /// Returns true if the current page is the first page in the stack.
+  bool get isAtFirstPage => _currentPageIndex == 0;
+
+  /// Returns true if the current page is the last page in the stack.
+  bool get isAtLastPage => _currentPageIndex == _pages.length - 1;
+
   final GlobalKey _childKey = GlobalKey(debugLabel: 'Modal sheet child');
 
   static const barrierLayoutId = 'barrierLayoutId';
@@ -888,9 +903,6 @@ class WoltModalSheetState extends State<WoltModalSheet> {
     }
     return false;
   }
-
-  /// The index of the currently displayed page in the in-modal navigation stack.
-  int get currentPageIndex => _currentPageIndex;
 }
 
 class _WoltModalMultiChildLayoutDelegate extends MultiChildLayoutDelegate {

playground/lib/home/pages/root_sheet_page.dart

@@ -21,17 +21,14 @@ class RootSheetPage {
   static List<SliverWoltModalSheetPage> _constructAllPagesAfterRootPage(
           BuildContext context) =>
       [
-        SheetPageWithForcedMaxHeight.build(
-          Theme.of(context).brightness,
-          isLastPage: false,
-        ),
-        SheetPageWithHeroImage.build(isLastPage: false),
-        SheetPageWithLazyList.build(isLastPage: false),
-        SheetPageWithTextField.build(isLastPage: false),
-        SheetPageWithMinHeight.build(isLastPage: false),
-        SheetPageWithInAppNavigation.build(isLastPage: false),
-        SheetPageWithCustomTopBar.build(isLastPage: false),
-        SheetPageWithNoPageTitleNoTopBar.build(isLastPage: false),
+        SheetPageWithForcedMaxHeight.build(Theme.of(context).brightness),
+        SheetPageWithHeroImage.build(),
+        SheetPageWithLazyList.build(),
+        SheetPageWithTextField.build(),
+        SheetPageWithMinHeight.build(),
+        SheetPageWithInAppNavigation.build(),
+        SheetPageWithCustomTopBar.build(),
+        SheetPageWithNoPageTitleNoTopBar.build(),
         SheetPageWithUpdatePage.build(context, isLastPage: true),
       ];
 

playground/lib/home/pages/sheet_page_with_custom_top_bar.dart

@@ -13,22 +13,14 @@ class SheetPageWithCustomTopBar {
   static const ModalPageName pageId = ModalPageName.customTopBar;
 
   /// Builds and returns a [WoltModalSheetPage] with custom top bar.
-  static WoltModalSheetPage build({bool isLastPage = true}) {
+  static WoltModalSheetPage build() {
     return WoltModalSheetPage(
       id: pageId,
       backgroundColor: WoltColors.blue8,
       forceMaxHeight: true,
-      stickyActionBar: Padding(
-        padding: const EdgeInsets.all(16.0),
-        child: Builder(builder: (context) {
-          return WoltElevatedButton(
-            onPressed: isLastPage
-                ? Navigator.of(context).pop
-                : WoltModalSheet.of(context).showNext,
-            colorName: WoltColorName.blue,
-            child: Text(isLastPage ? "Close" : "Next"),
-          );
-        }),
+      stickyActionBar: const Padding(
+        padding: EdgeInsets.all(16.0),
+        child: WoltModalSheetCloseOrNextSab(),
       ),
       trailingNavBarWidget: const WoltModalSheetCloseButton(),
       isTopBarLayerAlwaysVisible: false,

playground/lib/home/pages/sheet_page_with_forced_max_height.dart

@@ -19,17 +19,9 @@ class SheetPageWithForcedMaxHeight {
           : WoltColors.green64,
       hasSabGradient: false,
       forceMaxHeight: true,
-      stickyActionBar: Padding(
-        padding: const EdgeInsets.fromLTRB(16, 0, 16, 16),
-        child: Builder(builder: (context) {
-          return WoltElevatedButton(
-            onPressed: isLastPage
-                ? Navigator.of(context).pop
-                : WoltModalSheet.of(context).showNext,
-            colorName: WoltColorName.green,
-            child: Text(isLastPage ? "Close" : "Next"),
-          );
-        }),
+      stickyActionBar: const Padding(
+        padding: EdgeInsets.fromLTRB(16, 0, 16, 16),
+        child: WoltModalSheetCloseOrNextSab(colorName: WoltColorName.green),
       ),
       pageTitle: const ModalSheetTitle(
           'Page with forced max height and background color'),

playground/lib/home/pages/sheet_page_with_hero_image.dart

@@ -8,23 +8,16 @@ class SheetPageWithHeroImage {
 
   static const ModalPageName pageId = ModalPageName.heroImage;
 
-  static WoltModalSheetPage build({bool isLastPage = true}) {
+  static WoltModalSheetPage build() {
     return WoltModalSheetPage(
       id: pageId,
       heroImage: const Image(
         image: AssetImage('lib/assets/images/hero_image.jpg'),
         fit: BoxFit.cover,
       ),
-      stickyActionBar: Padding(
-        padding: const EdgeInsets.fromLTRB(16, 0, 16, 16),
-        child: Builder(builder: (context) {
-          return WoltElevatedButton(
-            onPressed: isLastPage
-                ? Navigator.of(context).pop
-                : WoltModalSheet.of(context).showNext,
-            child: Text(isLastPage ? "Close" : "Next"),
-          );
-        }),
+      stickyActionBar: const Padding(
+        padding: EdgeInsets.fromLTRB(16, 0, 16, 16),
+        child: WoltModalSheetCloseOrNextSab(),
       ),
       pageTitle: const ModalSheetTitle('Page with a hero image'),
       leadingNavBarWidget: const WoltModalSheetBackButton(),

playground/lib/home/pages/sheet_page_with_in_app_navigation.dart

@@ -9,7 +9,7 @@ class SheetPageWithInAppNavigation {
 
   static const ModalPageName pageId = ModalPageName.inAppNavigation;
 
-  static WoltModalSheetPage build({bool isLastPage = true}) {
+  static WoltModalSheetPage build() {
     return WoltModalSheetPage(
       id: pageId,
       leadingNavBarWidget: const WoltModalSheetBackButton(),

playground/lib/home/pages/sheet_page_with_lazy_list.dart

@@ -8,25 +8,16 @@ class SheetPageWithLazyList {
 
   static const ModalPageName pageId = ModalPageName.lazyLoadingList;
 
-  static SliverWoltModalSheetPage build({bool isLastPage = true}) {
+  static SliverWoltModalSheetPage build() {
     final colors = allMaterialColors;
     const titleText = 'Material Colors';
     const heroImageHeight = 200.0;
     return SliverWoltModalSheetPage(
       id: pageId,
-      stickyActionBar: isLastPage
-          ? null
-          : Padding(
-              padding: const EdgeInsets.fromLTRB(16, 0, 16, 16),
-              child: Builder(builder: (context) {
-                return WoltElevatedButton(
-                  onPressed: isLastPage
-                      ? Navigator.of(context).pop
-                      : WoltModalSheet.of(context).showNext,
-                  child: const Text("Next"),
-                );
-              }),
-            ),
+      stickyActionBar: const Padding(
+        padding: EdgeInsets.fromLTRB(16, 0, 16, 16),
+        child: WoltModalSheetCloseOrNextSab(),
+      ),
       topBarTitle: const ModalSheetTopBarTitle(titleText),
       heroImageHeight: heroImageHeight,
       heroImage: const Stack(

playground/lib/home/pages/sheet_page_with_min_height.dart

@@ -8,20 +8,13 @@ class SheetPageWithMinHeight {
 
   static const ModalPageName pageId = ModalPageName.minHeight;
 
-  static WoltModalSheetPage build({bool isLastPage = true}) {
+  static WoltModalSheetPage build() {
     return WoltModalSheetPage(
       id: pageId,
       hasTopBarLayer: false,
-      stickyActionBar: Padding(
-        padding: const EdgeInsets.fromLTRB(16, 0, 16, 16),
-        child: Builder(builder: (context) {
-          return WoltElevatedButton(
-            onPressed: isLastPage
-                ? Navigator.of(context).pop
-                : WoltModalSheet.of(context).showNext,
-            child: Text(isLastPage ? "Close" : "Next"),
-          );
-        }),
+      stickyActionBar: const Padding(
+        padding: EdgeInsets.fromLTRB(16, 0, 16, 16),
+        child: WoltModalSheetCloseOrNextSab(),
       ),
       child: const Padding(
         padding: EdgeInsets.only(bottom: 100, top: 16, left: 16, right: 16),

playground/lib/home/pages/sheet_page_with_no_page_title_and_no_top_bar.dart

@@ -15,17 +15,9 @@ class SheetPageWithNoPageTitleNoTopBar {
       id: pageId,
       backgroundColor: WoltColors.green8,
       forceMaxHeight: true,
-      stickyActionBar: Padding(
-        padding: const EdgeInsets.fromLTRB(16, 0, 16, 16),
-        child: Builder(builder: (context) {
-          return WoltElevatedButton(
-            onPressed: isLastPage
-                ? Navigator.of(context).pop
-                : WoltModalSheet.of(context).showNext,
-            colorName: WoltColorName.green,
-            child: Text(isLastPage ? "Close" : "Next"),
-          );
-        }),
+      stickyActionBar: const Padding(
+        padding: EdgeInsets.fromLTRB(16, 0, 16, 16),
+        child: WoltModalSheetCloseOrNextSab(colorName: WoltColorName.green),
       ),
       hasTopBarLayer: false,
       child: const Padding(

playground/lib/home/pages/sheet_page_with_text_field.dart

@@ -8,7 +8,7 @@ class SheetPageWithTextField {
 
   static const ModalPageName pageId = ModalPageName.textField;
 
-  static WoltModalSheetPage build({bool isLastPage = true}) {
+  static WoltModalSheetPage build() {
     ValueNotifier<bool> isButtonEnabledNotifier = ValueNotifier(false);
     final textEditingController = TextEditingController();
     textEditingController.addListener(() {
@@ -19,6 +19,7 @@ class SheetPageWithTextField {
       stickyActionBar: ValueListenableBuilder<bool>(
         valueListenable: isButtonEnabledNotifier,
         builder: (context, isEnabled, __) {
+          final isLastPage = WoltModalSheet.of(context).isAtLastPage;
           return Padding(
             padding: const EdgeInsets.fromLTRB(16, 0, 16, 16),
             child: WoltElevatedButton(

playground/lib/home/pages/sheet_page_with_update_page_method.dart

@@ -20,15 +20,9 @@ class SheetPageWithUpdatePage {
       enableDrag: enableDrag,
       hasTopBarLayer: hasTopBarLayer,
       stickyActionBar: Builder(builder: (context) {
-        return Padding(
-          padding: const EdgeInsets.fromLTRB(16, 0, 16, 16),
-          child: WoltElevatedButton(
-            onPressed: isLastPage
-                ? Navigator.of(context).pop
-                : WoltModalSheet.of(context).showNext,
-            colorName: WoltColorName.green,
-            child: Text(isLastPage ? "Close" : "Next"),
-          ),
+        return const Padding(
+          padding: EdgeInsets.fromLTRB(16, 0, 16, 16),
+          child: WoltModalSheetCloseOrNextSab(colorName: WoltColorName.green),
         );
       }),
       isTopBarLayerAlwaysVisible: hasTopBarLayer,

test/wolt_modal_sheet_test.dart

@@ -277,5 +277,45 @@ void main() {
         equals(const Size(524.0, 86.0)),
       );
     });
+
+    testWidgets('getters return the correct page, page index and list of pages',
+        (tester) async {
+      const page1Id = 'page1';
+      const page2Id = 'page2';
+      final page1 =
+          WoltModalSheetPage(child: const Text('Page 1'), id: page1Id);
+      final page2 =
+          WoltModalSheetPage(child: const Text('Page 2'), id: page2Id);
+
+      await tester.pumpWidget(buildSheetWithShow(
+        pageListBuilder: (_) => [page1, page2],
+      ));
+
+      await tester.tap(find.text('Open sheet'));
+      await tester.pumpAndSettle();
+
+      final WoltModalSheetState modal =
+          WoltModalSheet.of(tester.element(find.text('Page 1')));
+
+      expect(modal.pages.length, 2);
+      expect(modal.pages[0].id, page1Id);
+      expect(modal.pages[1].id, page2Id);
+      expect(modal.currentPage, page1);
+      expect(modal.currentPageIndex, 0);
+      expect(modal.isAtFirstPage, isTrue);
+      expect(modal.isAtLastPage, isFalse);
+
+      // Go to next page
+      modal.showNext();
+      await tester.pumpAndSettle();
+
+      expect(modal.pages.length, 2);
+      expect(modal.pages[0].id, page1Id);
+      expect(modal.pages[1].id, page2Id);
+      expect(modal.currentPage, page2);
+      expect(modal.currentPageIndex, 1);
+      expect(modal.isAtFirstPage, isFalse);
+      expect(modal.isAtLastPage, isTrue);
+    });
   });
 }