Merge pull request #227 from deepikahr/animation_test

Animation test

Author: Sandipkakadiya

lib/components/bottom_sheet/gf_bottom_sheet.dart

@@ -258,7 +258,7 @@ class GFBottomSheetController extends ValueNotifier<bool> {
 
   // ignore: unnecessary_getters_setters
   double? get height => _height;
-  bool? get isBottomSheetOpened => value;
+  bool get isBottomSheetOpened => value;
   void hideBottomSheet() => value = false;
   void showBottomSheet() => value = true;
 }

lib/components/carousel/gf_carousel.dart

@@ -52,7 +52,7 @@ class GFCarousel extends StatefulWidget {
   final num viewportFraction;
 
   /// The initial page to show when first creating the [GFCarousel]. Defaults to 0.
-  final num initialPage;
+  final int initialPage;
 
   /// Determines if slides should loop infinitely or be limited to item length. Defaults to true, i.e. infinite loop.
   final bool enableInfiniteScroll;
@@ -97,8 +97,8 @@ class GFCarousel extends StatefulWidget {
   /// Defaults to matching platform conventions.
   final ScrollPhysics? scrollPhysics;
 
-  List<T?> map<T>(List list, Function handler) {
-    List<T?> result;
+  List<T> map<T>(List list, Function handler) {
+    List<T> result;
     result = [];
     for (var i = 0; i < list.length; i++) {
       result.add(handler(i, list[i]));
@@ -125,23 +125,24 @@ class _GFCarouselState extends State<GFCarousel> with TickerProviderStateMixin {
 
   /// The actual index of the [PageView].
   int realPage = 10000;
+  int? currentSlide;
 
   @override
   void initState() {
     super.initState();
     realPage = widget.enableInfiniteScroll
         // ignore: avoid_as
-        ? realPage + (widget.initialPage as int)
+        ? realPage + widget.initialPage
         // ignore: avoid_as
-        : widget.initialPage as int;
+        : widget.initialPage;
     pageController = PageController(
       // ignore: avoid_as
       viewportFraction: widget.viewportFraction as double,
       initialPage: widget.enableInfiniteScroll
           // ignore: avoid_as
-          ? realPage + (widget.initialPage as int)
+          ? realPage + widget.initialPage
           // ignore: avoid_as
-          : widget.initialPage as int,
+          : widget.initialPage,
     );
     timer = getPlayTimer();
   }
@@ -189,8 +190,6 @@ class _GFCarouselState extends State<GFCarousel> with TickerProviderStateMixin {
     setState(() => currentSlide = index);
   }
 
-  int? currentSlide;
-
   @override
   Widget build(BuildContext context) => Stack(
         children: <Widget>[
@@ -206,25 +205,23 @@ class _GFCarouselState extends State<GFCarousel> with TickerProviderStateMixin {
                     : widget.items.length,
             onPageChanged: (int index) {
               int currentPage;
-              // ignore: avoid_as
-              currentPage = _getRealIndex(index + (widget.initialPage as int),
-                  realPage, widget.items.length);
+              currentPage = _getRealIndex(
+                  index + widget.initialPage, realPage, widget.items.length);
               if (widget.onPageChanged != null) {
                 widget.onPageChanged!(currentPage);
               }
-              if (widget.pagination == true && widget.onPageChanged == null) {
+              if (widget.pagination == true) {
                 onPageSlide(currentPage);
               }
             },
             itemBuilder: (BuildContext context, int i) {
-              final int index = _getRealIndex(
-                // ignore: avoid_as
-                i + (widget.initialPage as int),
+              int index;
+              index = _getRealIndex(
+                i + widget.initialPage,
                 realPage,
                 widget.items.length,
               );
-
-              currentSlide = index;
+              currentSlide = widget.initialPage;
               return AnimatedBuilder(
                 animation: pageController,
                 child: widget.items[index],
@@ -283,27 +280,29 @@ class _GFCarouselState extends State<GFCarousel> with TickerProviderStateMixin {
                     child: Row(
                       mainAxisAlignment: MainAxisAlignment.center,
                       children: widget.map<Widget>(
-                        widget.items,
-                        (pagerIndex, url) => Container(
-                          width:
-                              widget.pagerSize == null ? 8.0 : widget.pagerSize,
-                          height:
-                              widget.pagerSize == null ? 8.0 : widget.pagerSize,
-                          margin: const EdgeInsets.symmetric(
-                              vertical: 10, horizontal: 2),
-                          decoration: BoxDecoration(
-                            shape: BoxShape.circle,
-                            color: currentSlide == pagerIndex
-                                ? widget.activeIndicator == null
-                                    ? const Color.fromRGBO(0, 0, 0, 0.9)
-                                    : widget.activeIndicator!
-                                : widget.passiveIndicator == null
-                                    ? const Color.fromRGBO(0, 0, 0, 0.4)
-                                    : widget.passiveIndicator!,
+                          widget.items,
+                          (pagerIndex, url) => Container(
+                                width: widget.pagerSize == null
+                                    ? 8.0
+                                    : widget.pagerSize,
+                                height: widget.pagerSize == null
+                                    ? 8.0
+                                    : widget.pagerSize,
+                                margin: const EdgeInsets.symmetric(
+                                    vertical: 10, horizontal: 2),
+                                decoration: BoxDecoration(
+                                  shape: BoxShape.circle,
+                                  color: currentSlide == pagerIndex
+                                      ? widget.activeIndicator == null
+                                          ? const Color.fromRGBO(0, 0, 0, 0.9)
+                                          : widget.activeIndicator!
+                                      : widget.passiveIndicator == null
+                                          ? const Color.fromRGBO(0, 0, 0, 0.4)
+                                          : widget.passiveIndicator!,
+                                ),
+                              )
+                          // ignore: avoid_as
                           ),
-                        ),
-                        // ignore: avoid_as
-                      ) as List<Widget>,
                     ),
                   ),
                 )

lib/components/progress_bar/gf_progress_bar.dart

@@ -220,10 +220,12 @@ class _GFProgressBarState extends State<GFProgressBar>
   @override
   Widget build(BuildContext context) {
     super.build(context);
-    final item = <Widget?>[];
+
+    final item = List<Widget>.empty(growable: true);
     if (widget.leading != null) {
-      item.add(widget.leading);
+      item.add(widget.leading!);
     }
+
     final hasSetWidth = widget.width != null;
     final containerWidget = Container(
         margin: const EdgeInsets.only(left: 10, right: 10),
@@ -271,7 +273,7 @@ class _GFProgressBarState extends State<GFProgressBar>
       ));
     }
     if (widget.trailing != null) {
-      item.add(widget.trailing);
+      item.add(widget.trailing!);
     }
     return widget.type == GFProgressType.linear
         ? Material(
@@ -281,8 +283,7 @@ class _GFProgressBarState extends State<GFProgressBar>
                 child: Row(
                   mainAxisAlignment: widget.alignment,
                   crossAxisAlignment: CrossAxisAlignment.center,
-                  // ignore: avoid_as
-                  children: item as List<Widget>,
+                  children: item,
                 )),
           )
         : Material(
@@ -292,8 +293,7 @@ class _GFProgressBarState extends State<GFProgressBar>
                 child: Column(
                   crossAxisAlignment: CrossAxisAlignment.center,
                   mainAxisAlignment: MainAxisAlignment.spaceBetween,
-                  // ignore: avoid_as
-                  children: item as List<Widget>,
+                  children: item,
                 )),
           );
   }

lib/components/tabs/gf_tabbar_view.dart

@@ -45,18 +45,15 @@ class GFTabBarView extends StatefulWidget {
   _GFTabBarViewState createState() => _GFTabBarViewState();
 }
 
-final PageScrollPhysics _kGFTabBarViewPhysics =
-    const PageScrollPhysics().applyTo(const ClampingScrollPhysics());
-
 class _GFTabBarViewState extends State<GFTabBarView> {
   TabController? _controller;
-  PageController? _pageController;
-  List<Widget>? _children;
-  List<Widget>? _childrenWithKey;
+  late PageController _pageController;
+  late List<Widget> _children;
+  late List<Widget> _childrenWithKey;
   int? _currentIndex;
   int _warpUnderwayCount = 0;
 
-  // If the GFTabBarView is rebuilt with a new tab controller, the caller should
+  // 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;
@@ -74,15 +71,17 @@ class _GFTabBarViewState extends State<GFTabBarView> {
       }
       return true;
     }());
+
     if (newController == _controller) {
       return;
     }
+
     if (_controllerIsValid) {
-      _controller?.animation?.removeListener(_handleTabControllerAnimationTick);
+      _controller!.animation!.removeListener(_handleTabControllerAnimationTick);
     }
     _controller = newController;
     if (_controller != null) {
-      _controller?.animation?.addListener(_handleTabControllerAnimationTick);
+      _controller!.animation!.addListener(_handleTabControllerAnimationTick);
     }
   }
 
@@ -114,7 +113,7 @@ class _GFTabBarViewState extends State<GFTabBarView> {
   @override
   void dispose() {
     if (_controllerIsValid) {
-      _controller?.animation?.removeListener(_handleTabControllerAnimationTick);
+      _controller!.animation!.removeListener(_handleTabControllerAnimationTick);
     }
     _controller = null;
     // We don't own the _controller Animation, so it's not disposed here.
@@ -127,47 +126,50 @@ class _GFTabBarViewState extends State<GFTabBarView> {
   }
 
   void _handleTabControllerAnimationTick() {
-    if (_controller != null) {
-      if (_warpUnderwayCount > 0 || !_controller!.indexIsChanging) {
-        return;
-      } // This widget is driving the controller's animation.
-      if (_controller!.index != _currentIndex) {
-        _currentIndex = _controller!.index;
-        _warpToCurrentIndex();
-      }
+    if (_warpUnderwayCount > 0 || !_controller!.indexIsChanging) {
+      return;
+    } // This widget is driving the controller's animation.
+
+    if (_controller!.index != _currentIndex) {
+      _currentIndex = _controller!.index;
+      _warpToCurrentIndex();
     }
   }
 
   Future<void> _warpToCurrentIndex() async {
-    if (!mounted || _pageController == null || _currentIndex == null) {
+    if (!mounted) {
       return Future<void>.value();
     }
 
-    if (_pageController!.page == _currentIndex!.toDouble()) {
+    if (_pageController.page == _currentIndex!.toDouble()) {
       return Future<void>.value();
     }
 
     final int previousIndex = _controller!.previousIndex;
     if ((_currentIndex! - previousIndex).abs() == 1) {
-      return _pageController?.animateToPage(_currentIndex!,
+      _warpUnderwayCount += 1;
+      await _pageController.animateToPage(_currentIndex!,
           duration: kTabScrollDuration, curve: Curves.ease);
+      _warpUnderwayCount -= 1;
+      return Future<void>.value();
     }
 
     assert((_currentIndex! - previousIndex).abs() > 1);
     final int initialPage = _currentIndex! > previousIndex
         ? _currentIndex! - 1
         : _currentIndex! + 1;
-    final List<Widget>? originalChildren = _childrenWithKey;
+    final List<Widget> originalChildren = _childrenWithKey;
     setState(() {
       _warpUnderwayCount += 1;
-      _childrenWithKey = List<Widget>.from(_childrenWithKey!, growable: false);
-      final Widget temp = _childrenWithKey![initialPage];
-      _childrenWithKey![initialPage] = _childrenWithKey![previousIndex];
-      _childrenWithKey![previousIndex] = temp;
+
+      _childrenWithKey = List<Widget>.from(_childrenWithKey, growable: false);
+      final Widget temp = _childrenWithKey[initialPage];
+      _childrenWithKey[initialPage] = _childrenWithKey[previousIndex];
+      _childrenWithKey[previousIndex] = temp;
     });
-    _pageController?.jumpToPage(initialPage);
+    _pageController.jumpToPage(initialPage);
 
-    await _pageController?.animateToPage(_currentIndex!,
+    await _pageController.animateToPage(_currentIndex!,
         duration: kTabScrollDuration, curve: Curves.ease);
     if (!mounted) {
       return Future<void>.value();
@@ -187,30 +189,30 @@ class _GFTabBarViewState extends State<GFTabBarView> {
     if (_warpUnderwayCount > 0) {
       return false;
     }
+
     if (notification.depth != 0) {
       return false;
     }
-    if (_controller == null ||
-        _pageController == null ||
-        _pageController?.page != null ||
-        _controller?.index == null) {
-      return false;
-    }
 
     _warpUnderwayCount += 1;
     if (notification is ScrollUpdateNotification &&
         !_controller!.indexIsChanging) {
-      if ((_pageController!.page! - _controller!.index).abs() > 1.0) {
-        _controller!.index = _pageController!.page!.floor();
+      if ((_pageController.page! - _controller!.index).abs() > 1.0) {
+        _controller!.index = _pageController.page!.floor();
         _currentIndex = _controller!.index;
       }
       _controller!.offset =
-          (_pageController!.page! - _controller!.index).clamp(-1.0, 1.0);
+          (_pageController.page! - _controller!.index).clamp(-1.0, 1.0);
     } else if (notification is ScrollEndNotification) {
-      _controller!.index = _pageController!.page!.round();
+      _controller!.index = _pageController.page!.round();
       _currentIndex = _controller!.index;
+      if (!_controller!.indexIsChanging) {
+        _controller!.offset =
+            (_pageController.page! - _controller!.index).clamp(-1.0, 1.0);
+      }
     }
     _warpUnderwayCount -= 1;
+
     return false;
   }
 
@@ -231,10 +233,13 @@ class _GFTabBarViewState extends State<GFTabBarView> {
         child: PageView(
           dragStartBehavior: widget.dragStartBehavior,
           controller: _pageController,
+          // physics: widget.physics == null
+          //     ? _kGFTabBarViewPhysics
+          //     : _kGFTabBarViewPhysics.applyTo(widget.physics),
           physics: widget.physics == null
-              ? _kGFTabBarViewPhysics
-              : _kGFTabBarViewPhysics.applyTo(widget.physics),
-          children: _childrenWithKey!,
+              ? const PageScrollPhysics().applyTo(const ClampingScrollPhysics())
+              : const PageScrollPhysics().applyTo(widget.physics),
+          children: _childrenWithKey,
         ),
       ),
     );