mod: main: use tabbarview

Signed-off-by: bggRGjQaUbCoE <githubaccount56556@proton.me>

lib/common/widgets/tabs.dart

@@ -0,0 +1,356 @@
+// Copyright 2014 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:flutter/foundation.dart';
+import 'package:flutter/gestures.dart' show DragStartBehavior;
+import 'package:flutter/material.dart' hide TabBarView;
+
+/// A page view that displays the widget which corresponds to the currently
+/// selected tab.
+///
+/// This widget is typically used in conjunction with a [TabBar].
+///
+/// {@youtube 560 315 https://www.youtube.com/watch?v=POtoEH-5l40}
+///
+/// If a [TabController] is not provided, then there must be a [DefaultTabController]
+/// ancestor.
+///
+/// The tab controller's [TabController.length] must equal the length of the
+/// [children] list and the length of the [TabBar.tabs] list.
+///
+/// To see a sample implementation, visit the [TabController] documentation.
+class CustomTabBarView extends StatefulWidget {
+  /// Creates a page view with one child per tab.
+  ///
+  /// The length of [children] must be the same as the [controller]'s length.
+  const CustomTabBarView({
+    super.key,
+    required this.children,
+    this.controller,
+    this.physics,
+    this.dragStartBehavior = DragStartBehavior.start,
+    this.viewportFraction = 1.0,
+    this.clipBehavior = Clip.hardEdge,
+    this.scrollDirection = Axis.horizontal,
+  });
+
+  /// This widget's selection and animation state.
+  ///
+  /// If [TabController] is not provided, then the value of [DefaultTabController.of]
+  /// will be used.
+  final TabController? controller;
+
+  /// One widget per tab.
+  ///
+  /// Its length must match the length of the [TabBar.tabs]
+  /// list, as well as the [controller]'s [TabController.length].
+  final List<Widget> children;
+
+  /// How the page view should respond to user input.
+  ///
+  /// For example, determines how the page view continues to animate after the
+  /// user stops dragging the page view.
+  ///
+  /// The physics are modified to snap to page boundaries using
+  /// [PageScrollPhysics] prior to being used.
+  ///
+  /// Defaults to matching platform conventions.
+  final ScrollPhysics? physics;
+
+  /// {@macro flutter.widgets.scrollable.dragStartBehavior}
+  final DragStartBehavior dragStartBehavior;
+
+  /// {@macro flutter.widgets.pageview.viewportFraction}
+  final double viewportFraction;
+
+  /// {@macro flutter.material.Material.clipBehavior}
+  ///
+  /// Defaults to [Clip.hardEdge].
+  final Clip clipBehavior;
+
+  final Axis scrollDirection;
+
+  @override
+  State<CustomTabBarView> createState() => _CustomTabBarViewState();
+}
+
+class _CustomTabBarViewState extends State<CustomTabBarView> {
+  TabController? _controller;
+  PageController? _pageController;
+  late List<Widget> _childrenWithKey;
+  int? _currentIndex;
+  int _warpUnderwayCount = 0;
+  int _scrollUnderwayCount = 0;
+  bool _debugHasScheduledValidChildrenCountCheck = false;
+
+  // If the TabBarView is rebuilt with a new tab controller, the caller should
+  // dispose the old one. In that case the old controller's animation will be
+  // null and should not be accessed.
+  bool get _controllerIsValid => _controller?.animation != null;
+
+  void _updateTabController() {
+    final TabController? newController =
+        widget.controller ?? DefaultTabController.maybeOf(context);
+    assert(() {
+      if (newController == null) {
+        throw FlutterError(
+          'No TabController for ${widget.runtimeType}.\n'
+          'When creating a ${widget.runtimeType}, you must either provide an explicit '
+          'TabController using the "controller" property, or you must ensure that there '
+          'is a DefaultTabController above the ${widget.runtimeType}.\n'
+          'In this case, there was neither an explicit controller nor a default controller.',
+        );
+      }
+      return true;
+    }());
+
+    if (newController == _controller) {
+      return;
+    }
+
+    if (_controllerIsValid) {
+      _controller!.animation!.removeListener(_handleTabControllerAnimationTick);
+    }
+    _controller = newController;
+    if (_controller != null) {
+      _controller!.animation!.addListener(_handleTabControllerAnimationTick);
+    }
+  }
+
+  void _jumpToPage(int page) {
+    _warpUnderwayCount += 1;
+    _pageController!.jumpToPage(page);
+    _warpUnderwayCount -= 1;
+  }
+
+  Future<void> _animateToPage(
+    int page, {
+    required Duration duration,
+    required Curve curve,
+  }) async {
+    _warpUnderwayCount += 1;
+    await _pageController!
+        .animateToPage(page, duration: duration, curve: curve);
+    _warpUnderwayCount -= 1;
+  }
+
+  @override
+  void initState() {
+    super.initState();
+    _updateChildren();
+  }
+
+  @override
+  void didChangeDependencies() {
+    super.didChangeDependencies();
+    _updateTabController();
+    _currentIndex = _controller!.index;
+    if (_pageController == null) {
+      _pageController = PageController(
+        initialPage: _currentIndex!,
+        viewportFraction: widget.viewportFraction,
+      );
+    } else {
+      _pageController!.jumpToPage(_currentIndex!);
+    }
+  }
+
+  @override
+  void didUpdateWidget(CustomTabBarView oldWidget) {
+    super.didUpdateWidget(oldWidget);
+    if (widget.controller != oldWidget.controller) {
+      _updateTabController();
+      _currentIndex = _controller!.index;
+      _jumpToPage(_currentIndex!);
+    }
+    if (widget.viewportFraction != oldWidget.viewportFraction) {
+      _pageController?.dispose();
+      _pageController = PageController(
+        initialPage: _currentIndex!,
+        viewportFraction: widget.viewportFraction,
+      );
+    }
+    // While a warp is under way, we stop updating the tab page contents.
+    // This is tracked in https://github.com/flutter/flutter/issues/31269.
+    if (widget.children != oldWidget.children && _warpUnderwayCount == 0) {
+      _updateChildren();
+    }
+  }
+
+  @override
+  void dispose() {
+    if (_controllerIsValid) {
+      _controller!.animation!.removeListener(_handleTabControllerAnimationTick);
+    }
+    _controller = null;
+    _pageController?.dispose();
+    // We don't own the _controller Animation, so it's not disposed here.
+    super.dispose();
+  }
+
+  void _updateChildren() {
+    _childrenWithKey = KeyedSubtree.ensureUniqueKeysForList(widget.children);
+  }
+
+  void _handleTabControllerAnimationTick() {
+    if (_scrollUnderwayCount > 0 || !_controller!.indexIsChanging) {
+      return;
+    } // This widget is driving the controller's animation.
+
+    if (_controller!.index != _currentIndex) {
+      _currentIndex = _controller!.index;
+      _warpToCurrentIndex();
+    }
+  }
+
+  void _warpToCurrentIndex() {
+    if (!mounted || _pageController!.page == _currentIndex!.toDouble()) {
+      return;
+    }
+
+    final bool adjacentDestination =
+        (_currentIndex! - _controller!.previousIndex).abs() == 1;
+    if (adjacentDestination) {
+      _warpToAdjacentTab(_controller!.animationDuration);
+    } else {
+      _warpToNonAdjacentTab(_controller!.animationDuration);
+    }
+  }
+
+  Future<void> _warpToAdjacentTab(Duration duration) async {
+    if (duration == Duration.zero) {
+      _jumpToPage(_currentIndex!);
+    } else {
+      await _animateToPage(_currentIndex!,
+          duration: duration, curve: Curves.ease);
+    }
+    if (mounted) {
+      setState(() {
+        _updateChildren();
+      });
+    }
+    return Future<void>.value();
+  }
+
+  Future<void> _warpToNonAdjacentTab(Duration duration) async {
+    final int previousIndex = _controller!.previousIndex;
+    assert((_currentIndex! - previousIndex).abs() > 1);
+
+    // initialPage defines which page is shown when starting the animation.
+    // This page is adjacent to the destination page.
+    final int initialPage = _currentIndex! > previousIndex
+        ? _currentIndex! - 1
+        : _currentIndex! + 1;
+
+    setState(() {
+      // Needed for `RenderSliverMultiBoxAdaptor.move` and kept alive children.
+      // For motivation, see https://github.com/flutter/flutter/pull/29188 and
+      // https://github.com/flutter/flutter/issues/27010#issuecomment-486475152.
+      _childrenWithKey = List<Widget>.of(_childrenWithKey, growable: false);
+      final Widget temp = _childrenWithKey[initialPage];
+      _childrenWithKey[initialPage] = _childrenWithKey[previousIndex];
+      _childrenWithKey[previousIndex] = temp;
+    });
+
+    // Make a first jump to the adjacent page.
+    _jumpToPage(initialPage);
+
+    // Jump or animate to the destination page.
+    if (duration == Duration.zero) {
+      _jumpToPage(_currentIndex!);
+    } else {
+      await _animateToPage(_currentIndex!,
+          duration: duration, curve: Curves.ease);
+    }
+
+    if (mounted) {
+      setState(() {
+        _updateChildren();
+      });
+    }
+  }
+
+  void _syncControllerOffset() {
+    _controller!.offset =
+        clampDouble(_pageController!.page! - _controller!.index, -1.0, 1.0);
+  }
+
+  // Called when the PageView scrolls
+  bool _handleScrollNotification(ScrollNotification notification) {
+    if (_warpUnderwayCount > 0 || _scrollUnderwayCount > 0) {
+      return false;
+    }
+
+    if (notification.depth != 0) {
+      return false;
+    }
+
+    if (!_controllerIsValid) {
+      return false;
+    }
+
+    _scrollUnderwayCount += 1;
+    final double page = _pageController!.page!;
+    if (notification is ScrollUpdateNotification &&
+        !_controller!.indexIsChanging) {
+      final bool pageChanged = (page - _controller!.index).abs() > 1.0;
+      if (pageChanged) {
+        _controller!.index = page.round();
+        _currentIndex = _controller!.index;
+      }
+      _syncControllerOffset();
+    } else if (notification is ScrollEndNotification) {
+      _controller!.index = page.round();
+      _currentIndex = _controller!.index;
+      if (!_controller!.indexIsChanging) {
+        _syncControllerOffset();
+      }
+    }
+    _scrollUnderwayCount -= 1;
+
+    return false;
+  }
+
+  bool _debugScheduleCheckHasValidChildrenCount() {
+    if (_debugHasScheduledValidChildrenCountCheck) {
+      return true;
+    }
+    WidgetsBinding.instance.addPostFrameCallback((Duration duration) {
+      _debugHasScheduledValidChildrenCountCheck = false;
+      if (!mounted) {
+        return;
+      }
+      assert(() {
+        if (_controller!.length != widget.children.length) {
+          throw FlutterError(
+            "Controller's length property (${_controller!.length}) does not match the "
+            "number of children (${widget.children.length}) present in TabBarView's children property.",
+          );
+        }
+        return true;
+      }());
+    }, debugLabel: 'TabBarView.validChildrenCountCheck');
+    _debugHasScheduledValidChildrenCountCheck = true;
+    return true;
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    assert(_debugScheduleCheckHasValidChildrenCount());
+
+    return NotificationListener<ScrollNotification>(
+      onNotification: _handleScrollNotification,
+      child: PageView(
+        scrollDirection: widget.scrollDirection,
+        dragStartBehavior: widget.dragStartBehavior,
+        clipBehavior: widget.clipBehavior,
+        controller: _pageController,
+        physics: widget.physics == null
+            ? const PageScrollPhysics().applyTo(const ClampingScrollPhysics())
+            : const PageScrollPhysics().applyTo(widget.physics),
+        children: _childrenWithKey,
+      ),
+    );
+  }
+}

lib/pages/main/controller.dart

@@ -23,7 +23,7 @@ class MainController extends GetxController {
   final StreamController<bool> bottomBarStream =
       StreamController<bool>.broadcast();
   late bool hideTabBar;
-  late PageController pageController;
+  late TabController controller;
   RxInt selectedIndex = 0.obs;
   RxBool isLogin = false.obs;
 

lib/pages/main/view.dart

@@ -2,6 +2,7 @@ import 'dart:async';
 import 'dart:io';
 
 import 'package:PiliPlus/common/widgets/network_img_layer.dart';
+import 'package:PiliPlus/common/widgets/tabs.dart';
 import 'package:PiliPlus/grpc/grpc_client.dart';
 import 'package:PiliPlus/pages/mine/controller.dart';
 import 'package:PiliPlus/utils/utils.dart';
@@ -41,8 +42,11 @@ class _MainAppState extends State<MainApp>
   void initState() {
     super.initState();
     _lastSelectTime = DateTime.now().millisecondsSinceEpoch;
-    _mainController.pageController =
+    _mainController.controller = TabController(
-        PageController(initialPage: _mainController.selectedIndex.value);
+      vsync: this,
+      initialIndex: _mainController.selectedIndex.value,
+      length: _mainController.navigationBars.length,
+    );
     enableMYBar =
         GStorage.setting.get(SettingBoxKey.enableMYBar, defaultValue: true);
     useSideBar =
@@ -110,7 +114,7 @@ class _MainAppState extends State<MainApp>
 
     if (value != _mainController.selectedIndex.value) {
       _mainController.selectedIndex.value = value;
-      _mainController.pageController.jumpToPage(value);
+      _mainController.controller.animateTo(value);
       dynamic currentPage = _mainController.pages[value];
       if (currentPage is HomePage) {
         _checkDefaultSearch();
@@ -213,9 +217,12 @@ class _MainAppState extends State<MainApp>
               color: Theme.of(context).colorScheme.outline.withOpacity(0.06),
             ),
             Expanded(
-              child: PageView(
+              child: CustomTabBarView(
+                scrollDirection: context.orientation == Orientation.portrait
+                    ? Axis.horizontal
+                    : Axis.vertical,
                 physics: const NeverScrollableScrollPhysics(),
-                controller: _mainController.pageController,
+                controller: _mainController.controller,
                 children: _mainController.pages,
               ),
             ),