From 54a3d7d20e1f9890e7e6ce7936812b1b27211f3f Mon Sep 17 00:00:00 2001 From: Svetozar Date: Tue, 27 Apr 2021 16:21:58 +0300 Subject: [PATCH 1/9] Added shrinkWrap and scrollPhysics parameters --- lib/scroll_snap_list.dart | 15 +++++++++++++-- 1 file changed, 13 insertions(+), 2 deletions(-) diff --git a/lib/scroll_snap_list.dart b/lib/scroll_snap_list.dart index 3bf07dc..2ff0804 100644 --- a/lib/scroll_snap_list.dart +++ b/lib/scroll_snap_list.dart @@ -100,7 +100,13 @@ class ScrollSnapList extends StatefulWidget { ///Anchor location for selected item in the list final SelectedItemAnchor selectedItemAnchor; - + + /// {@macro flutter.widgets.scroll_view.shrinkWrap} + final bool shrinkWrap; + + /// {@macro flutter.widgets.scroll_view.physics} + final ScrollPhysics? scrollPhysics; + ScrollSnapList( {this.background, required this.itemBuilder, @@ -125,7 +131,10 @@ class ScrollSnapList extends StatefulWidget { this.dynamicItemSize = false, this.dynamicSizeEquation, this.dynamicItemOpacity, - this.selectedItemAnchor = SelectedItemAnchor.MIDDLE}) + this.selectedItemAnchor = SelectedItemAnchor.MIDDLE, + this.shrinkWrap = false, + this.scrollPhysics, + }) : listController = listController ?? ScrollController(), super(key: key); @@ -362,6 +371,8 @@ class ScrollSnapListState extends State { scrollDirection: widget.scrollDirection, itemBuilder: _buildListItem, itemCount: widget.itemCount, + shrinkWrap: widget.shrinkWrap, + physics: widget.scrollPhysics, ), ), ); From a60c488b792a2d7e633afcf6dd41315589de5440 Mon Sep 17 00:00:00 2001 From: Svetozar Volkov Date: Tue, 27 Apr 2021 18:22:38 +0300 Subject: [PATCH 2/9] added SnapScrollListController --- example/dynamic_horizontal.dart | 20 ++-- example/horizontal_jumbotron.dart | 4 +- example/horizontal_list.dart | 18 ++-- example/tab_with_horizontal.dart | 8 +- example/vertical_list.dart | 2 +- lib/scroll_snap_list.dart | 159 ++++++++++++++++++------------ 6 files changed, 119 insertions(+), 92 deletions(-) diff --git a/example/dynamic_horizontal.dart b/example/dynamic_horizontal.dart index 1089694..1e4467e 100644 --- a/example/dynamic_horizontal.dart +++ b/example/dynamic_horizontal.dart @@ -30,12 +30,12 @@ class _DynamicHorizontalDemoState extends State { }); } - Widget _buildItemDetail() { - if (_focusedIndex<0) return Container( - height: 250, - child: Text("Nothing selected"), - ); + if (_focusedIndex < 0) + return Container( + height: 250, + child: Text("Nothing selected"), + ); if (data.length > _focusedIndex) return Container( @@ -51,7 +51,9 @@ class _DynamicHorizontalDemoState extends State { Widget _buildListItem(BuildContext context, int index) { if (index == data.length) - return Center(child: CircularProgressIndicator(),); + return Center( + child: CircularProgressIndicator(), + ); //horizontal return Container( @@ -71,9 +73,9 @@ class _DynamicHorizontalDemoState extends State { } ///Override default dynamicItemSize calculation - double customEquation(double distance){ + double customEquation(double distance) { // return 1-min(distance.abs()/500, 0.2); - return 1-(distance/1000); + return 1 - (distance / 1000); } @override @@ -90,7 +92,7 @@ class _DynamicHorizontalDemoState extends State { Expanded( child: ScrollSnapList( onItemFocus: _onItemFocus, - itemSize: 150, + itemExtent: 150, itemBuilder: _buildListItem, itemCount: data.length, dynamicItemSize: true, diff --git a/example/horizontal_jumbotron.dart b/example/horizontal_jumbotron.dart index 6e0f0f7..eaa2573 100644 --- a/example/horizontal_jumbotron.dart +++ b/example/horizontal_jumbotron.dart @@ -50,7 +50,7 @@ class _HorizontalListJumboDemoState extends State { child: Material( color: Colors.lightBlueAccent, child: InkWell( - onTap: (){ + onTap: () { sslKey.currentState!.focusToItem(index); }, child: Text("Child index $index"), @@ -74,7 +74,7 @@ class _HorizontalListJumboDemoState extends State { child: ScrollSnapList( margin: EdgeInsets.symmetric(vertical: 10), onItemFocus: _onItemFocus, - itemSize: 360, + itemExtent: 360, itemBuilder: _buildListItem, itemCount: data.length, key: sslKey, diff --git a/example/horizontal_list.dart b/example/horizontal_list.dart index 0bffc0b..085be0e 100644 --- a/example/horizontal_list.dart +++ b/example/horizontal_list.dart @@ -32,15 +32,15 @@ class _HorizontalListDemoState extends State { void _loadMoreData() { setState(() { - _isLoading = true; + _isLoading = true; }); - + Future.delayed(Duration(seconds: 1), () { setState(() { for (int i = 0; i < 10; i++) { data.add(Random().nextInt(100) + 1); } - _isLoading = false; + _isLoading = false; }); }); } @@ -60,7 +60,9 @@ class _HorizontalListDemoState extends State { Widget _buildListItem(BuildContext context, int index) { if (index == data.length) - return Center(child: CircularProgressIndicator(),); + return Center( + child: CircularProgressIndicator(), + ); //horizontal return Container( @@ -94,9 +96,9 @@ class _HorizontalListDemoState extends State { child: ScrollSnapList( onItemFocus: _onItemFocus, onReachEnd: _loadMoreData, - itemSize: 35, + itemExtent: 35, itemBuilder: _buildListItem, - itemCount: _isLoading?data.length+1:data.length, + itemCount: _isLoading ? data.length + 1 : data.length, reverse: true, endOfListTolerance: 100, ), @@ -116,9 +118,7 @@ class _HorizontalListDemoState extends State { ElevatedButton( child: Text("Remove Item"), onPressed: () { - int index = data.length > 1 - ? Random().nextInt(data.length - 1) - : 0; + int index = data.length > 1 ? Random().nextInt(data.length - 1) : 0; setState(() { data.removeAt(index); }); diff --git a/example/tab_with_horizontal.dart b/example/tab_with_horizontal.dart index 492599f..a62b116 100644 --- a/example/tab_with_horizontal.dart +++ b/example/tab_with_horizontal.dart @@ -15,11 +15,7 @@ class TabWithHorizontalListDemo extends StatelessWidget { key: PageStorageKey("Tab 3"), ) ]; - final List _tabMenu = [ - Tab(child: Text('Tab 1')), - Tab(child: Text('Tab 2')), - Tab(child: Text('Tab 3')) - ]; + final List _tabMenu = [Tab(child: Text('Tab 1')), Tab(child: Text('Tab 2')), Tab(child: Text('Tab 3'))]; @override Widget build(BuildContext context) { @@ -112,7 +108,7 @@ class _HorizontalListJumboState extends State { child: ScrollSnapList( margin: EdgeInsets.symmetric(vertical: 10), onItemFocus: _onItemFocus, - itemSize: 360, + itemExtent: 360, itemBuilder: _buildListItem, itemCount: data.length, key: sslKey, diff --git a/example/vertical_list.dart b/example/vertical_list.dart index 115db43..c9edc3a 100644 --- a/example/vertical_list.dart +++ b/example/vertical_list.dart @@ -81,7 +81,7 @@ class _VerticalListDemoState extends State { height: 300, child: ScrollSnapList( onItemFocus: _onItemFocus, - itemSize: 50, + itemExtent: 50, // selectedItemAnchor: SelectedItemAnchor.START, //to change item anchor uncomment this line // dynamicItemOpacity: 0.3, //to set unselected item opacity uncomment this line itemBuilder: _buildListItem, diff --git a/lib/scroll_snap_list.dart b/lib/scroll_snap_list.dart index 2ff0804..b8d7dbf 100644 --- a/lib/scroll_snap_list.dart +++ b/lib/scroll_snap_list.dart @@ -49,7 +49,7 @@ class ScrollSnapList extends StatefulWidget { ///- Card with `width` 100 ///- Margin is `EdgeInsets.symmetric(horizontal: 5)` ///- itemSize is `100+5+5 = 110` - final double itemSize; + final double itemExtent; ///Global key that's used to call `focusToItem` method to manually trigger focus event. final Key? key; @@ -72,7 +72,7 @@ class ScrollSnapList extends StatefulWidget { final bool reverse; ///Calls onItemFocus (if it exists) when ScrollUpdateNotification fires - final bool? updateOnScroll; + final bool updateOnScroll; ///An optional initial position which will not snap until after the first drag final double? initialIndex; @@ -81,7 +81,7 @@ class ScrollSnapList extends StatefulWidget { final Axis scrollDirection; ///Allows external controller - final ScrollController listController; + final SnapScrollListController listController; ///Scale item's size depending on distance to center final bool dynamicItemSize; @@ -100,42 +100,41 @@ class ScrollSnapList extends StatefulWidget { ///Anchor location for selected item in the list final SelectedItemAnchor selectedItemAnchor; - + /// {@macro flutter.widgets.scroll_view.shrinkWrap} final bool shrinkWrap; - + /// {@macro flutter.widgets.scroll_view.physics} final ScrollPhysics? scrollPhysics; - - ScrollSnapList( - {this.background, - required this.itemBuilder, - ScrollController? listController, - this.curve = Curves.ease, - this.duration = 500, - this.endOfListTolerance, - this.focusOnItemTap = true, - this.focusToItem, - this.itemCount, - required this.itemSize, - this.key, - this.listViewKey, - this.margin, - required this.onItemFocus, - this.onReachEnd, - this.padding, - this.reverse = false, - this.updateOnScroll, - this.initialIndex, - this.scrollDirection = Axis.horizontal, - this.dynamicItemSize = false, - this.dynamicSizeEquation, - this.dynamicItemOpacity, - this.selectedItemAnchor = SelectedItemAnchor.MIDDLE, - this.shrinkWrap = false, - this.scrollPhysics, - }) - : listController = listController ?? ScrollController(), + + ScrollSnapList({ + this.background, + required this.itemBuilder, + SnapScrollListController? scrollController, + this.curve = Curves.ease, + this.duration = 500, + this.endOfListTolerance, + this.focusOnItemTap = true, + this.focusToItem, + this.itemCount, + required this.itemExtent, + this.key, + this.listViewKey, + this.margin, + required this.onItemFocus, + this.onReachEnd, + this.padding, + this.reverse = false, + this.updateOnScroll = false, + this.initialIndex, + this.scrollDirection = Axis.horizontal, + this.dynamicItemSize = false, + this.dynamicSizeEquation, + this.dynamicItemOpacity, + this.selectedItemAnchor = SelectedItemAnchor.MIDDLE, + this.shrinkWrap = false, + this.scrollPhysics, + }) : listController = scrollController ?? SnapScrollListController(itemExtent: itemExtent), super(key: key); @override @@ -150,8 +149,14 @@ class ScrollSnapListState extends State { //Current scroll-position in pixel double currentPixel = 0; + // this flag is set by controller, so programmatically + // controlled scroll won't be broken by listener + bool _programmaticallyControlledScrollInProgress = false; + void initState() { super.initState(); + widget.listController._attach(this); + WidgetsBinding.instance!.addPostFrameCallback((_) { if (widget.initialIndex != null) { //set list's initial position @@ -185,7 +190,7 @@ class ScrollSnapListState extends State { ///Calculate scale transformation for dynamic item size double calculateScale(int index) { //scroll-pixel position for index to be at the center of ScrollSnapList - double intendedPixel = index * widget.itemSize; + double intendedPixel = index * widget.itemExtent; double difference = intendedPixel - currentPixel; if (widget.dynamicSizeEquation != null) { @@ -201,7 +206,7 @@ class ScrollSnapListState extends State { ///Calculate opacity transformation for dynamic item opacity double calculateOpacity(int index) { //scroll-pixel position for index to be at the center of ScrollSnapList - double intendedPixel = index * widget.itemSize; + double intendedPixel = index * widget.itemExtent; double difference = intendedPixel - currentPixel; return (difference == 0) ? 1.0 : widget.dynamicItemOpacity ?? 1.0; @@ -234,14 +239,12 @@ class ScrollSnapListState extends State { ///Calculates target pixel for scroll animation /// ///Then trigger `onItemFocus` - double _calcCardLocation( - {double? pixel, required double itemSize, int? index}) { + double _calcCardLocation({double? pixel, required double itemSize, int? index}) { //current pixel: pixel //listPadding is not considered as moving pixel by scroll (0.0 is after padding) //substracted by itemSize/2 (to center the item) //divided by pixels taken by each item - int cardIndex = - index != null ? index : ((pixel! - itemSize / 2) / itemSize).ceil(); + int cardIndex = index != null ? index : ((pixel! - itemSize / 2) / itemSize).ceil(); //trigger onItemFocus if (cardIndex != previousIndex) { @@ -254,16 +257,15 @@ class ScrollSnapListState extends State { } /// Trigger focus to an item inside the list - /// Will trigger scoll animation to focused item + /// Will trigger scroll animation to focused item void focusToItem(int index) { - double targetLoc = - _calcCardLocation(index: index, itemSize: widget.itemSize); + double targetLoc = _calcCardLocation(index: index, itemSize: widget.itemExtent); _animateScroll(targetLoc); } ///Determine location if initialIndex is set void focusToInitialPosition() { - widget.listController.jumpTo((widget.initialIndex! * widget.itemSize)); + widget.listController.jumpTo((widget.initialIndex! * widget.itemExtent)); } ///Trigger callback on reach end-of-list @@ -292,17 +294,13 @@ class ScrollSnapListState extends State { _listPadding = 0; break; case SelectedItemAnchor.MIDDLE: - _listPadding = (widget.scrollDirection == Axis.horizontal - ? constraint.maxWidth - : constraint.maxHeight) / - 2 - - widget.itemSize / 2; + _listPadding = + (widget.scrollDirection == Axis.horizontal ? constraint.maxWidth : constraint.maxHeight) / 2 - + widget.itemExtent / 2; break; case SelectedItemAnchor.END: - _listPadding = (widget.scrollDirection == Axis.horizontal - ? constraint.maxWidth - : constraint.maxHeight) - - widget.itemSize; + _listPadding = (widget.scrollDirection == Axis.horizontal ? constraint.maxWidth : constraint.maxHeight) - + widget.itemExtent; break; } @@ -312,22 +310,20 @@ class ScrollSnapListState extends State { child: NotificationListener( onNotification: (ScrollNotification scrollInfo) { if (scrollInfo is ScrollEndNotification) { - // dont snap until after first drag + // don't snap until after first drag if (isInit) { return true; } - double tolerance = - widget.endOfListTolerance ?? (widget.itemSize / 2); - if (scrollInfo.metrics.pixels >= - scrollInfo.metrics.maxScrollExtent - tolerance) { + double tolerance = widget.endOfListTolerance ?? (widget.itemExtent / 2); + if (scrollInfo.metrics.pixels >= scrollInfo.metrics.maxScrollExtent - tolerance) { _onReachEnd(); } //snap the selection double offset = _calcCardLocation( pixel: scrollInfo.metrics.pixels, - itemSize: widget.itemSize, + itemSize: widget.itemExtent, ); //only animate if not yet snapped (tolerance 0.01 pixel) @@ -336,15 +332,14 @@ class ScrollSnapListState extends State { } } else if (scrollInfo is ScrollUpdateNotification) { //save pixel position for scale-effect - if (widget.dynamicItemSize || - widget.dynamicItemOpacity != null) { + if (widget.dynamicItemSize || widget.dynamicItemOpacity != null) { setState(() { currentPixel = scrollInfo.metrics.pixels; }); } - if (widget.updateOnScroll == true) { - // dont snap until after first drag + if (widget.updateOnScroll && !_programmaticallyControlledScrollInProgress) { + // don't snap until after first drag if (isInit) { return true; } @@ -352,7 +347,7 @@ class ScrollSnapListState extends State { if (isInit == false) { _calcCardLocation( pixel: scrollInfo.metrics.pixels, - itemSize: widget.itemSize, + itemSize: widget.itemExtent, ); } } @@ -381,3 +376,37 @@ class ScrollSnapListState extends State { ); } } + +class SnapScrollListController extends ScrollController { + SnapScrollListController({required this.itemExtent}); + + ScrollSnapListState? _state; + bool get isAttached => _state != null; + + void _attach(ScrollSnapListState state) { + _state = state; + } + + final double itemExtent; + Future animateToIndex(int index, {required Duration duration, required Curve curve}) { + final scrollTarget = itemExtent * index; + + return animateTo(scrollTarget, duration: duration, curve: curve); + } + + void jumpToIndex(int index) { + jumpTo(itemExtent * index); + } + + @override + Future animateTo(double offset, {required Duration duration, required Curve curve}) { + assert(isAttached, 'This controller should be attached to SnapScrollList to perform scroll animations.'); + _state!._programmaticallyControlledScrollInProgress = true; + Future.delayed(duration, () { + // something happened, ignore this operation + if (!isAttached) return; + _state!._programmaticallyControlledScrollInProgress = false; + }); + return super.animateTo(offset, duration: duration, curve: curve); + } +} From 0bd49235a1e98a6941e7eab7e65a8a199586e8eb Mon Sep 17 00:00:00 2001 From: Svetozar Volkov Date: Thu, 20 May 2021 10:46:25 +0300 Subject: [PATCH 3/9] changed api --- lib/scroll_snap_list.dart | 198 ++++++++++++++++---------------------- 1 file changed, 85 insertions(+), 113 deletions(-) diff --git a/lib/scroll_snap_list.dart b/lib/scroll_snap_list.dart index b8d7dbf..936fe66 100644 --- a/lib/scroll_snap_list.dart +++ b/lib/scroll_snap_list.dart @@ -5,7 +5,7 @@ import 'dart:math'; import 'package:flutter/material.dart'; ///Anchor location for selected item in the list -enum SelectedItemAnchor { START, MIDDLE, END } +enum SelectedItemAnchor { start, middle, end } ///A ListView widget that able to "snap" or focus to an item whenever user scrolls. /// @@ -22,16 +22,13 @@ class ScrollSnapList extends StatefulWidget { ///Animation curve final Curve curve; - ///Animation duration in milliseconds (ms) - final int duration; + ///Animation duration + final Duration duration; ///Pixel tolerance to trigger onReachEnd. ///Default is itemSize/2 final double? endOfListTolerance; - ///Focus to an item when user tap on it. Inactive if the list-item have its own onTap detector (use state-key to help focusing instead). - final bool focusOnItemTap; - ///Method to manually trigger focus to an item. Call with help of `GlobalKey`. final void Function(int)? focusToItem; @@ -49,7 +46,9 @@ class ScrollSnapList extends StatefulWidget { ///- Card with `width` 100 ///- Margin is `EdgeInsets.symmetric(horizontal: 5)` ///- itemSize is `100+5+5 = 110` - final double itemExtent; + /// + ///If [scrollController] is set, it's value will be used. + final double? itemExtent; ///Global key that's used to call `focusToItem` method to manually trigger focus event. final Key? key; @@ -58,7 +57,7 @@ class ScrollSnapList extends StatefulWidget { final Key? listViewKey; ///Callback function when list snaps/focuses to an item - final void Function(int) onItemFocus; + final void Function(int)? onItemFocus; ///Callback function when user reach end of list. /// @@ -72,7 +71,7 @@ class ScrollSnapList extends StatefulWidget { final bool reverse; ///Calls onItemFocus (if it exists) when ScrollUpdateNotification fires - final bool updateOnScroll; + final bool snapOnScroll; ///An optional initial position which will not snap until after the first drag final double? initialIndex; @@ -81,7 +80,7 @@ class ScrollSnapList extends StatefulWidget { final Axis scrollDirection; ///Allows external controller - final SnapScrollListController listController; + final SnapScrollListController? scrollController; ///Scale item's size depending on distance to center final bool dynamicItemSize; @@ -99,10 +98,10 @@ class ScrollSnapList extends StatefulWidget { final double? dynamicItemOpacity; ///Anchor location for selected item in the list - final SelectedItemAnchor selectedItemAnchor; + final SelectedItemAnchor? selectedItemAnchor; - /// {@macro flutter.widgets.scroll_view.shrinkWrap} - final bool shrinkWrap; + /// + final double? listPadding; /// {@macro flutter.widgets.scroll_view.physics} final ScrollPhysics? scrollPhysics; @@ -110,14 +109,13 @@ class ScrollSnapList extends StatefulWidget { ScrollSnapList({ this.background, required this.itemBuilder, - SnapScrollListController? scrollController, + this.scrollController, this.curve = Curves.ease, - this.duration = 500, + this.duration = const Duration(milliseconds: 500), this.endOfListTolerance, - this.focusOnItemTap = true, this.focusToItem, this.itemCount, - required this.itemExtent, + this.itemExtent, this.key, this.listViewKey, this.margin, @@ -125,16 +123,17 @@ class ScrollSnapList extends StatefulWidget { this.onReachEnd, this.padding, this.reverse = false, - this.updateOnScroll = false, + this.snapOnScroll = false, this.initialIndex, this.scrollDirection = Axis.horizontal, this.dynamicItemSize = false, this.dynamicSizeEquation, this.dynamicItemOpacity, - this.selectedItemAnchor = SelectedItemAnchor.MIDDLE, - this.shrinkWrap = false, + this.selectedItemAnchor, + this.listPadding, this.scrollPhysics, - }) : listController = scrollController ?? SnapScrollListController(itemExtent: itemExtent), + }) : assert((listPadding == null) != (selectedItemAnchor == null)), + assert((scrollController == null) != (itemExtent == null)), super(key: key); @override @@ -142,27 +141,29 @@ class ScrollSnapList extends StatefulWidget { } class ScrollSnapListState extends State { - //true if initialIndex exists and first drag hasn't occurred - bool isInit = true; + late final SnapScrollListController scrollController; + late final double itemExtent; + + /// true if initialIndex exists and first drag hasn't occurred + bool waitingForFirstDrag = true; //to avoid multiple onItemFocus when using updateOnScroll int previousIndex = -1; //Current scroll-position in pixel double currentPixel = 0; - // this flag is set by controller, so programmatically - // controlled scroll won't be broken by listener bool _programmaticallyControlledScrollInProgress = false; void initState() { super.initState(); - widget.listController._attach(this); - + scrollController = widget.scrollController ?? SnapScrollListController(itemExtent: widget.itemExtent!); + itemExtent = widget.itemExtent ?? scrollController.itemExtent; + scrollController._attach(this); WidgetsBinding.instance!.addPostFrameCallback((_) { if (widget.initialIndex != null) { //set list's initial position focusToInitialPosition(); } else { - isInit = false; + waitingForFirstDrag = false; } }); @@ -170,27 +171,16 @@ class ScrollSnapListState extends State { Future.delayed(Duration(milliseconds: 10), () { if (this.mounted) { setState(() { - isInit = false; + waitingForFirstDrag = false; }); } }); } - ///Scroll list to an offset - void _animateScroll(double location) { - Future.delayed(Duration.zero, () { - widget.listController.animateTo( - location, - duration: new Duration(milliseconds: widget.duration), - curve: widget.curve, - ); - }); - } - ///Calculate scale transformation for dynamic item size double calculateScale(int index) { //scroll-pixel position for index to be at the center of ScrollSnapList - double intendedPixel = index * widget.itemExtent; + double intendedPixel = index * itemExtent; double difference = intendedPixel - currentPixel; if (widget.dynamicSizeEquation != null) { @@ -206,7 +196,7 @@ class ScrollSnapListState extends State { ///Calculate opacity transformation for dynamic item opacity double calculateOpacity(int index) { //scroll-pixel position for index to be at the center of ScrollSnapList - double intendedPixel = index * widget.itemExtent; + double intendedPixel = index * itemExtent; double difference = intendedPixel - currentPixel; return (difference == 0) ? 1.0 : widget.dynamicItemOpacity ?? 1.0; @@ -227,45 +217,14 @@ class ScrollSnapListState extends State { child = Opacity(child: child, opacity: calculateOpacity(index)); } - if (widget.focusOnItemTap) - return GestureDetector( - onTap: () => focusToItem(index), - child: child, - ); - return child; } - ///Calculates target pixel for scroll animation - /// - ///Then trigger `onItemFocus` - double _calcCardLocation({double? pixel, required double itemSize, int? index}) { - //current pixel: pixel - //listPadding is not considered as moving pixel by scroll (0.0 is after padding) - //substracted by itemSize/2 (to center the item) - //divided by pixels taken by each item - int cardIndex = index != null ? index : ((pixel! - itemSize / 2) / itemSize).ceil(); - - //trigger onItemFocus - if (cardIndex != previousIndex) { - previousIndex = cardIndex; - widget.onItemFocus(cardIndex); - } - - //target position - return (cardIndex * itemSize); - } - - /// Trigger focus to an item inside the list - /// Will trigger scroll animation to focused item - void focusToItem(int index) { - double targetLoc = _calcCardLocation(index: index, itemSize: widget.itemExtent); - _animateScroll(targetLoc); - } + int _calcCardIndex(double pixel, double itemExtent) => ((pixel - itemExtent / 2) / itemExtent).ceil(); ///Determine location if initialIndex is set void focusToInitialPosition() { - widget.listController.jumpTo((widget.initialIndex! * widget.itemExtent)); + scrollController.jumpTo((widget.initialIndex! * itemExtent)); } ///Trigger callback on reach end-of-list @@ -275,7 +234,9 @@ class ScrollSnapListState extends State { @override void dispose() { - widget.listController.dispose(); + if (widget.scrollController == null) { + scrollController.dispose(); + } super.dispose(); } @@ -290,17 +251,20 @@ class ScrollSnapListState extends State { //determine anchor switch (widget.selectedItemAnchor) { - case SelectedItemAnchor.START: + case null: + _listPadding = widget.listPadding!; + break; + case SelectedItemAnchor.start: _listPadding = 0; break; - case SelectedItemAnchor.MIDDLE: + case SelectedItemAnchor.middle: _listPadding = (widget.scrollDirection == Axis.horizontal ? constraint.maxWidth : constraint.maxHeight) / 2 - - widget.itemExtent / 2; + itemExtent / 2; break; - case SelectedItemAnchor.END: - _listPadding = (widget.scrollDirection == Axis.horizontal ? constraint.maxWidth : constraint.maxHeight) - - widget.itemExtent; + case SelectedItemAnchor.end: + _listPadding = + (widget.scrollDirection == Axis.horizontal ? constraint.maxWidth : constraint.maxHeight) - itemExtent; break; } @@ -310,25 +274,29 @@ class ScrollSnapListState extends State { child: NotificationListener( onNotification: (ScrollNotification scrollInfo) { if (scrollInfo is ScrollEndNotification) { - // don't snap until after first drag - if (isInit) { + // don't snap until first drag + if (waitingForFirstDrag || _programmaticallyControlledScrollInProgress) { return true; } - double tolerance = widget.endOfListTolerance ?? (widget.itemExtent / 2); + double tolerance = widget.endOfListTolerance ?? (itemExtent / 2); if (scrollInfo.metrics.pixels >= scrollInfo.metrics.maxScrollExtent - tolerance) { _onReachEnd(); } - //snap the selection - double offset = _calcCardLocation( - pixel: scrollInfo.metrics.pixels, - itemSize: widget.itemExtent, - ); + final index = _calcCardIndex(scrollInfo.metrics.pixels, itemExtent); + if (index != previousIndex) { + previousIndex = index; - //only animate if not yet snapped (tolerance 0.01 pixel) - if ((scrollInfo.metrics.pixels - offset).abs() > 0.01) { - _animateScroll(offset); + if (widget.onItemFocus != null) widget.onItemFocus!(index); + + if (waitingForFirstDrag || _programmaticallyControlledScrollInProgress) { + return true; + } + + if (waitingForFirstDrag == false) { + Future.delayed(Duration.zero, () => scrollController.animateToIndex(index)); + } } } else if (scrollInfo is ScrollUpdateNotification) { //save pixel position for scale-effect @@ -338,17 +306,20 @@ class ScrollSnapListState extends State { }); } - if (widget.updateOnScroll && !_programmaticallyControlledScrollInProgress) { - // don't snap until after first drag - if (isInit) { - return true; - } + final index = _calcCardIndex(scrollInfo.metrics.pixels, itemExtent); + if (index != previousIndex) { + previousIndex = index; + + if (widget.onItemFocus != null) widget.onItemFocus!(index); - if (isInit == false) { - _calcCardLocation( - pixel: scrollInfo.metrics.pixels, - itemSize: widget.itemExtent, - ); + if (widget.snapOnScroll) { + if (waitingForFirstDrag || _programmaticallyControlledScrollInProgress) { + return true; + } + + if (waitingForFirstDrag == false) { + Future.delayed(Duration.zero, () => scrollController.animateToIndex(index)); + } } } } @@ -356,7 +327,7 @@ class ScrollSnapListState extends State { }, child: ListView.builder( key: widget.listViewKey, - controller: widget.listController, + controller: widget.scrollController, padding: widget.scrollDirection == Axis.horizontal ? EdgeInsets.symmetric(horizontal: _listPadding) : EdgeInsets.symmetric( @@ -366,7 +337,6 @@ class ScrollSnapListState extends State { scrollDirection: widget.scrollDirection, itemBuilder: _buildListItem, itemCount: widget.itemCount, - shrinkWrap: widget.shrinkWrap, physics: widget.scrollPhysics, ), ), @@ -388,7 +358,7 @@ class SnapScrollListController extends ScrollController { } final double itemExtent; - Future animateToIndex(int index, {required Duration duration, required Curve curve}) { + Future animateToIndex(int index, {Duration? duration, Curve? curve}) { final scrollTarget = itemExtent * index; return animateTo(scrollTarget, duration: duration, curve: curve); @@ -399,14 +369,16 @@ class SnapScrollListController extends ScrollController { } @override - Future animateTo(double offset, {required Duration duration, required Curve curve}) { + Future animateTo(double offset, {Duration? duration, Curve? curve}) async { assert(isAttached, 'This controller should be attached to SnapScrollList to perform scroll animations.'); + + final d = duration ?? _state!.widget.duration; + final c = curve ?? _state!.widget.curve; + _state!._programmaticallyControlledScrollInProgress = true; - Future.delayed(duration, () { - // something happened, ignore this operation - if (!isAttached) return; - _state!._programmaticallyControlledScrollInProgress = false; - }); - return super.animateTo(offset, duration: duration, curve: curve); + + await super.animateTo(offset, duration: d, curve: c); + + _state?._programmaticallyControlledScrollInProgress = false; } } From 8b6f10b0c115c6315de1a7babc32a1741ab86a10 Mon Sep 17 00:00:00 2001 From: Svetozar Volkov Date: Thu, 20 May 2021 10:46:47 +0300 Subject: [PATCH 4/9] added proper example --- .vscode/launch.json | 14 + example/.gitignore | 46 ++ example/.metadata | 10 + example/android/.gitignore | 11 + example/android/app/build.gradle | 59 +++ .../android/app/src/debug/AndroidManifest.xml | 7 + .../android/app/src/main/AndroidManifest.xml | 41 ++ .../com/example/example/MainActivity.kt | 6 + .../res/drawable-v21/launch_background.xml | 12 + .../main/res/drawable/launch_background.xml | 12 + .../src/main/res/mipmap-hdpi/ic_launcher.png | Bin 0 -> 544 bytes .../src/main/res/mipmap-mdpi/ic_launcher.png | Bin 0 -> 442 bytes .../src/main/res/mipmap-xhdpi/ic_launcher.png | Bin 0 -> 721 bytes .../main/res/mipmap-xxhdpi/ic_launcher.png | Bin 0 -> 1031 bytes .../main/res/mipmap-xxxhdpi/ic_launcher.png | Bin 0 -> 1443 bytes .../app/src/main/res/values-night/styles.xml | 18 + .../app/src/main/res/values/styles.xml | 18 + .../app/src/profile/AndroidManifest.xml | 7 + example/android/build.gradle | 31 ++ example/android/gradle.properties | 3 + .../gradle/wrapper/gradle-wrapper.properties | 6 + example/android/settings.gradle | 11 + example/ios/.gitignore | 32 ++ example/ios/Flutter/AppFrameworkInfo.plist | 26 + example/ios/Flutter/Debug.xcconfig | 1 + example/ios/Flutter/Release.xcconfig | 1 + example/ios/Runner.xcodeproj/project.pbxproj | 471 ++++++++++++++++++ .../contents.xcworkspacedata | 7 + .../xcshareddata/IDEWorkspaceChecks.plist | 8 + .../xcshareddata/WorkspaceSettings.xcsettings | 8 + .../xcshareddata/xcschemes/Runner.xcscheme | 91 ++++ .../contents.xcworkspacedata | 7 + .../xcshareddata/IDEWorkspaceChecks.plist | 8 + .../xcshareddata/WorkspaceSettings.xcsettings | 8 + example/ios/Runner/AppDelegate.swift | 13 + .../AppIcon.appiconset/Contents.json | 122 +++++ .../Icon-App-1024x1024@1x.png | Bin 0 -> 10932 bytes .../AppIcon.appiconset/Icon-App-20x20@1x.png | Bin 0 -> 564 bytes .../AppIcon.appiconset/Icon-App-20x20@2x.png | Bin 0 -> 1283 bytes .../AppIcon.appiconset/Icon-App-20x20@3x.png | Bin 0 -> 1588 bytes .../AppIcon.appiconset/Icon-App-29x29@1x.png | Bin 0 -> 1025 bytes .../AppIcon.appiconset/Icon-App-29x29@2x.png | Bin 0 -> 1716 bytes .../AppIcon.appiconset/Icon-App-29x29@3x.png | Bin 0 -> 1920 bytes .../AppIcon.appiconset/Icon-App-40x40@1x.png | Bin 0 -> 1283 bytes .../AppIcon.appiconset/Icon-App-40x40@2x.png | Bin 0 -> 1895 bytes .../AppIcon.appiconset/Icon-App-40x40@3x.png | Bin 0 -> 2665 bytes .../AppIcon.appiconset/Icon-App-60x60@2x.png | Bin 0 -> 2665 bytes .../AppIcon.appiconset/Icon-App-60x60@3x.png | Bin 0 -> 3831 bytes .../AppIcon.appiconset/Icon-App-76x76@1x.png | Bin 0 -> 1888 bytes .../AppIcon.appiconset/Icon-App-76x76@2x.png | Bin 0 -> 3294 bytes .../Icon-App-83.5x83.5@2x.png | Bin 0 -> 3612 bytes .../LaunchImage.imageset/Contents.json | 23 + .../LaunchImage.imageset/LaunchImage.png | Bin 0 -> 68 bytes .../LaunchImage.imageset/LaunchImage@2x.png | Bin 0 -> 68 bytes .../LaunchImage.imageset/LaunchImage@3x.png | Bin 0 -> 68 bytes .../LaunchImage.imageset/README.md | 5 + .../Runner/Base.lproj/LaunchScreen.storyboard | 37 ++ example/ios/Runner/Base.lproj/Main.storyboard | 26 + example/ios/Runner/Info.plist | 45 ++ example/ios/Runner/Runner-Bridging-Header.h | 1 + example/{ => lib}/dynamic_horizontal.dart | 3 +- example/{ => lib}/horizontal_jumbotron.dart | 52 +- example/{ => lib}/horizontal_list.dart | 3 +- example/lib/main.dart | 41 ++ example/{ => lib}/tab_with_horizontal.dart | 16 +- example/{ => lib}/vertical_list.dart | 17 +- example/pubspec.lock | 160 ++++++ example/pubspec.yaml | 72 +++ example/web/favicon.png | Bin 0 -> 917 bytes example/web/icons/Icon-192.png | Bin 0 -> 5292 bytes example/web/icons/Icon-512.png | Bin 0 -> 8252 bytes example/web/index.html | 45 ++ example/web/manifest.json | 23 + lib/scroll_snap_list.dart | 4 +- 74 files changed, 1644 insertions(+), 44 deletions(-) create mode 100644 .vscode/launch.json create mode 100644 example/.gitignore create mode 100644 example/.metadata create mode 100644 example/android/.gitignore create mode 100644 example/android/app/build.gradle create mode 100644 example/android/app/src/debug/AndroidManifest.xml create mode 100644 example/android/app/src/main/AndroidManifest.xml create mode 100644 example/android/app/src/main/kotlin/com/example/example/MainActivity.kt create mode 100644 example/android/app/src/main/res/drawable-v21/launch_background.xml create mode 100644 example/android/app/src/main/res/drawable/launch_background.xml create mode 100644 example/android/app/src/main/res/mipmap-hdpi/ic_launcher.png create mode 100644 example/android/app/src/main/res/mipmap-mdpi/ic_launcher.png create mode 100644 example/android/app/src/main/res/mipmap-xhdpi/ic_launcher.png create mode 100644 example/android/app/src/main/res/mipmap-xxhdpi/ic_launcher.png create mode 100644 example/android/app/src/main/res/mipmap-xxxhdpi/ic_launcher.png create mode 100644 example/android/app/src/main/res/values-night/styles.xml create mode 100644 example/android/app/src/main/res/values/styles.xml create mode 100644 example/android/app/src/profile/AndroidManifest.xml create mode 100644 example/android/build.gradle create mode 100644 example/android/gradle.properties create mode 100644 example/android/gradle/wrapper/gradle-wrapper.properties create mode 100644 example/android/settings.gradle create mode 100644 example/ios/.gitignore create mode 100644 example/ios/Flutter/AppFrameworkInfo.plist create mode 100644 example/ios/Flutter/Debug.xcconfig create mode 100644 example/ios/Flutter/Release.xcconfig create mode 100644 example/ios/Runner.xcodeproj/project.pbxproj create mode 100644 example/ios/Runner.xcodeproj/project.xcworkspace/contents.xcworkspacedata create mode 100644 example/ios/Runner.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist create mode 100644 example/ios/Runner.xcodeproj/project.xcworkspace/xcshareddata/WorkspaceSettings.xcsettings create mode 100644 example/ios/Runner.xcodeproj/xcshareddata/xcschemes/Runner.xcscheme create mode 100644 example/ios/Runner.xcworkspace/contents.xcworkspacedata create mode 100644 example/ios/Runner.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist create mode 100644 example/ios/Runner.xcworkspace/xcshareddata/WorkspaceSettings.xcsettings create mode 100644 example/ios/Runner/AppDelegate.swift create mode 100644 example/ios/Runner/Assets.xcassets/AppIcon.appiconset/Contents.json create mode 100644 example/ios/Runner/Assets.xcassets/AppIcon.appiconset/Icon-App-1024x1024@1x.png create mode 100644 example/ios/Runner/Assets.xcassets/AppIcon.appiconset/Icon-App-20x20@1x.png create mode 100644 example/ios/Runner/Assets.xcassets/AppIcon.appiconset/Icon-App-20x20@2x.png create mode 100644 example/ios/Runner/Assets.xcassets/AppIcon.appiconset/Icon-App-20x20@3x.png create mode 100644 example/ios/Runner/Assets.xcassets/AppIcon.appiconset/Icon-App-29x29@1x.png create mode 100644 example/ios/Runner/Assets.xcassets/AppIcon.appiconset/Icon-App-29x29@2x.png create mode 100644 example/ios/Runner/Assets.xcassets/AppIcon.appiconset/Icon-App-29x29@3x.png create mode 100644 example/ios/Runner/Assets.xcassets/AppIcon.appiconset/Icon-App-40x40@1x.png create mode 100644 example/ios/Runner/Assets.xcassets/AppIcon.appiconset/Icon-App-40x40@2x.png create mode 100644 example/ios/Runner/Assets.xcassets/AppIcon.appiconset/Icon-App-40x40@3x.png create mode 100644 example/ios/Runner/Assets.xcassets/AppIcon.appiconset/Icon-App-60x60@2x.png create mode 100644 example/ios/Runner/Assets.xcassets/AppIcon.appiconset/Icon-App-60x60@3x.png create mode 100644 example/ios/Runner/Assets.xcassets/AppIcon.appiconset/Icon-App-76x76@1x.png create mode 100644 example/ios/Runner/Assets.xcassets/AppIcon.appiconset/Icon-App-76x76@2x.png create mode 100644 example/ios/Runner/Assets.xcassets/AppIcon.appiconset/Icon-App-83.5x83.5@2x.png create mode 100644 example/ios/Runner/Assets.xcassets/LaunchImage.imageset/Contents.json create mode 100644 example/ios/Runner/Assets.xcassets/LaunchImage.imageset/LaunchImage.png create mode 100644 example/ios/Runner/Assets.xcassets/LaunchImage.imageset/LaunchImage@2x.png create mode 100644 example/ios/Runner/Assets.xcassets/LaunchImage.imageset/LaunchImage@3x.png create mode 100644 example/ios/Runner/Assets.xcassets/LaunchImage.imageset/README.md create mode 100644 example/ios/Runner/Base.lproj/LaunchScreen.storyboard create mode 100644 example/ios/Runner/Base.lproj/Main.storyboard create mode 100644 example/ios/Runner/Info.plist create mode 100644 example/ios/Runner/Runner-Bridging-Header.h rename example/{ => lib}/dynamic_horizontal.dart (97%) rename example/{ => lib}/horizontal_jumbotron.dart (62%) rename example/{ => lib}/horizontal_list.dart (98%) create mode 100644 example/lib/main.dart rename example/{ => lib}/tab_with_horizontal.dart (90%) rename example/{ => lib}/vertical_list.dart (87%) create mode 100644 example/pubspec.lock create mode 100644 example/pubspec.yaml create mode 100644 example/web/favicon.png create mode 100644 example/web/icons/Icon-192.png create mode 100644 example/web/icons/Icon-512.png create mode 100644 example/web/index.html create mode 100644 example/web/manifest.json diff --git a/.vscode/launch.json b/.vscode/launch.json new file mode 100644 index 0000000..4d776a9 --- /dev/null +++ b/.vscode/launch.json @@ -0,0 +1,14 @@ +{ + // Use IntelliSense to learn about possible attributes. + // Hover to view descriptions of existing attributes. + // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387 + "version": "0.2.0", + "configurations": [ + { + "name": "scroll_snap_list", + "request": "launch", + "type": "dart", + "program": "example/lib/main.dart" + } + ] +} diff --git a/example/.gitignore b/example/.gitignore new file mode 100644 index 0000000..0fa6b67 --- /dev/null +++ b/example/.gitignore @@ -0,0 +1,46 @@ +# Miscellaneous +*.class +*.log +*.pyc +*.swp +.DS_Store +.atom/ +.buildlog/ +.history +.svn/ + +# IntelliJ related +*.iml +*.ipr +*.iws +.idea/ + +# The .vscode folder contains launch configuration and tasks you configure in +# VS Code which you may wish to be included in version control, so this line +# is commented out by default. +#.vscode/ + +# Flutter/Dart/Pub related +**/doc/api/ +**/ios/Flutter/.last_build_id +.dart_tool/ +.flutter-plugins +.flutter-plugins-dependencies +.packages +.pub-cache/ +.pub/ +/build/ + +# Web related +lib/generated_plugin_registrant.dart + +# Symbolication related +app.*.symbols + +# Obfuscation related +app.*.map.json + +# Android Studio will place build artifacts here +/android/app/debug +/android/app/profile +/android/app/release diff --git a/example/.metadata b/example/.metadata new file mode 100644 index 0000000..c1ee81b --- /dev/null +++ b/example/.metadata @@ -0,0 +1,10 @@ +# This file tracks properties of this Flutter project. +# Used by Flutter tool to assess capabilities and perform upgrades etc. +# +# This file should be version controlled and should not be manually edited. + +version: + revision: 1d9032c7e1d867f071f2277eb1673e8f9b0274e3 + channel: stable + +project_type: app diff --git a/example/android/.gitignore b/example/android/.gitignore new file mode 100644 index 0000000..0a741cb --- /dev/null +++ b/example/android/.gitignore @@ -0,0 +1,11 @@ +gradle-wrapper.jar +/.gradle +/captures/ +/gradlew +/gradlew.bat +/local.properties +GeneratedPluginRegistrant.java + +# Remember to never publicly share your keystore. +# See https://flutter.dev/docs/deployment/android#reference-the-keystore-from-the-app +key.properties diff --git a/example/android/app/build.gradle b/example/android/app/build.gradle new file mode 100644 index 0000000..6ca2344 --- /dev/null +++ b/example/android/app/build.gradle @@ -0,0 +1,59 @@ +def localProperties = new Properties() +def localPropertiesFile = rootProject.file('local.properties') +if (localPropertiesFile.exists()) { + localPropertiesFile.withReader('UTF-8') { reader -> + localProperties.load(reader) + } +} + +def flutterRoot = localProperties.getProperty('flutter.sdk') +if (flutterRoot == null) { + throw new GradleException("Flutter SDK not found. Define location with flutter.sdk in the local.properties file.") +} + +def flutterVersionCode = localProperties.getProperty('flutter.versionCode') +if (flutterVersionCode == null) { + flutterVersionCode = '1' +} + +def flutterVersionName = localProperties.getProperty('flutter.versionName') +if (flutterVersionName == null) { + flutterVersionName = '1.0' +} + +apply plugin: 'com.android.application' +apply plugin: 'kotlin-android' +apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle" + +android { + compileSdkVersion 30 + + sourceSets { + main.java.srcDirs += 'src/main/kotlin' + } + + defaultConfig { + // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html). + applicationId "com.example.example" + minSdkVersion 16 + targetSdkVersion 30 + versionCode flutterVersionCode.toInteger() + versionName flutterVersionName + } + + buildTypes { + release { + // TODO: Add your own signing config for the release build. + // Signing with the debug keys for now, so `flutter run --release` works. + signingConfig signingConfigs.debug + } + } +} + +flutter { + source '../..' +} + +dependencies { + implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version" +} diff --git a/example/android/app/src/debug/AndroidManifest.xml b/example/android/app/src/debug/AndroidManifest.xml new file mode 100644 index 0000000..c208884 --- /dev/null +++ b/example/android/app/src/debug/AndroidManifest.xml @@ -0,0 +1,7 @@ + + + + diff --git a/example/android/app/src/main/AndroidManifest.xml b/example/android/app/src/main/AndroidManifest.xml new file mode 100644 index 0000000..34dd77e --- /dev/null +++ b/example/android/app/src/main/AndroidManifest.xml @@ -0,0 +1,41 @@ + + + + + + + + + + + + + + + + diff --git a/example/android/app/src/main/kotlin/com/example/example/MainActivity.kt b/example/android/app/src/main/kotlin/com/example/example/MainActivity.kt new file mode 100644 index 0000000..e793a00 --- /dev/null +++ b/example/android/app/src/main/kotlin/com/example/example/MainActivity.kt @@ -0,0 +1,6 @@ +package com.example.example + +import io.flutter.embedding.android.FlutterActivity + +class MainActivity: FlutterActivity() { +} diff --git a/example/android/app/src/main/res/drawable-v21/launch_background.xml b/example/android/app/src/main/res/drawable-v21/launch_background.xml new file mode 100644 index 0000000..f74085f --- /dev/null +++ b/example/android/app/src/main/res/drawable-v21/launch_background.xml @@ -0,0 +1,12 @@ + + + + + + + + diff --git a/example/android/app/src/main/res/drawable/launch_background.xml b/example/android/app/src/main/res/drawable/launch_background.xml new file mode 100644 index 0000000..304732f --- /dev/null +++ b/example/android/app/src/main/res/drawable/launch_background.xml @@ -0,0 +1,12 @@ + + + + + + + + diff --git a/example/android/app/src/main/res/mipmap-hdpi/ic_launcher.png b/example/android/app/src/main/res/mipmap-hdpi/ic_launcher.png new file mode 100644 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@@ -0,0 +1,18 @@ + + + + + + + diff --git a/example/android/app/src/profile/AndroidManifest.xml b/example/android/app/src/profile/AndroidManifest.xml new file mode 100644 index 0000000..c208884 --- /dev/null +++ b/example/android/app/src/profile/AndroidManifest.xml @@ -0,0 +1,7 @@ + + + + diff --git a/example/android/build.gradle b/example/android/build.gradle new file mode 100644 index 0000000..c505a86 --- /dev/null +++ b/example/android/build.gradle @@ -0,0 +1,31 @@ +buildscript { + ext.kotlin_version = '1.3.50' + repositories { + google() + jcenter() + } + + dependencies { + classpath 'com.android.tools.build:gradle:4.1.0' + classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version" + } +} + +allprojects { + repositories { + google() + jcenter() + } +} + +rootProject.buildDir = '../build' +subprojects { + project.buildDir = "${rootProject.buildDir}/${project.name}" +} +subprojects { + project.evaluationDependsOn(':app') +} + +task clean(type: Delete) { + delete rootProject.buildDir +} diff --git a/example/android/gradle.properties b/example/android/gradle.properties new file mode 100644 index 0000000..94adc3a --- /dev/null +++ b/example/android/gradle.properties @@ -0,0 +1,3 @@ +org.gradle.jvmargs=-Xmx1536M +android.useAndroidX=true +android.enableJetifier=true diff --git a/example/android/gradle/wrapper/gradle-wrapper.properties b/example/android/gradle/wrapper/gradle-wrapper.properties new file mode 100644 index 0000000..bc6a58a --- /dev/null +++ b/example/android/gradle/wrapper/gradle-wrapper.properties @@ -0,0 +1,6 @@ +#Fri Jun 23 08:50:38 CEST 2017 +distributionBase=GRADLE_USER_HOME +distributionPath=wrapper/dists +zipStoreBase=GRADLE_USER_HOME +zipStorePath=wrapper/dists +distributionUrl=https\://services.gradle.org/distributions/gradle-6.7-all.zip diff --git a/example/android/settings.gradle b/example/android/settings.gradle new file mode 100644 index 0000000..44e62bc --- /dev/null +++ b/example/android/settings.gradle @@ -0,0 +1,11 @@ +include ':app' + +def localPropertiesFile = new File(rootProject.projectDir, "local.properties") +def properties = new Properties() + +assert localPropertiesFile.exists() +localPropertiesFile.withReader("UTF-8") { reader -> properties.load(reader) } + +def flutterSdkPath = properties.getProperty("flutter.sdk") +assert flutterSdkPath != null, "flutter.sdk not set in local.properties" +apply from: "$flutterSdkPath/packages/flutter_tools/gradle/app_plugin_loader.gradle" diff --git a/example/ios/.gitignore b/example/ios/.gitignore new file mode 100644 index 0000000..e96ef60 --- /dev/null +++ b/example/ios/.gitignore @@ -0,0 +1,32 @@ +*.mode1v3 +*.mode2v3 +*.moved-aside +*.pbxuser +*.perspectivev3 +**/*sync/ +.sconsign.dblite +.tags* +**/.vagrant/ +**/DerivedData/ +Icon? +**/Pods/ +**/.symlinks/ +profile +xcuserdata +**/.generated/ +Flutter/App.framework +Flutter/Flutter.framework +Flutter/Flutter.podspec +Flutter/Generated.xcconfig +Flutter/app.flx +Flutter/app.zip +Flutter/flutter_assets/ +Flutter/flutter_export_environment.sh +ServiceDefinitions.json +Runner/GeneratedPluginRegistrant.* + +# Exceptions to above rules. +!default.mode1v3 +!default.mode2v3 +!default.pbxuser +!default.perspectivev3 diff --git a/example/ios/Flutter/AppFrameworkInfo.plist b/example/ios/Flutter/AppFrameworkInfo.plist new file mode 100644 index 0000000..9367d48 --- /dev/null +++ b/example/ios/Flutter/AppFrameworkInfo.plist @@ -0,0 +1,26 @@ + + + + + CFBundleDevelopmentRegion + en + CFBundleExecutable + App + CFBundleIdentifier + io.flutter.flutter.app + CFBundleInfoDictionaryVersion + 6.0 + CFBundleName + App + CFBundlePackageType + FMWK + CFBundleShortVersionString + 1.0 + CFBundleSignature + ???? + CFBundleVersion + 1.0 + MinimumOSVersion + 8.0 + + diff --git a/example/ios/Flutter/Debug.xcconfig b/example/ios/Flutter/Debug.xcconfig new file mode 100644 index 0000000..592ceee --- /dev/null +++ b/example/ios/Flutter/Debug.xcconfig @@ -0,0 +1 @@ +#include 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/dev/null +++ b/example/ios/Runner.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist @@ -0,0 +1,8 @@ + + + + + IDEDidComputeMac32BitWarning + + + diff --git a/example/ios/Runner.xcodeproj/project.xcworkspace/xcshareddata/WorkspaceSettings.xcsettings b/example/ios/Runner.xcodeproj/project.xcworkspace/xcshareddata/WorkspaceSettings.xcsettings new file mode 100644 index 0000000..f9b0d7c --- /dev/null +++ b/example/ios/Runner.xcodeproj/project.xcworkspace/xcshareddata/WorkspaceSettings.xcsettings @@ -0,0 +1,8 @@ + + + + + PreviewsEnabled + + + diff --git a/example/ios/Runner.xcodeproj/xcshareddata/xcschemes/Runner.xcscheme b/example/ios/Runner.xcodeproj/xcshareddata/xcschemes/Runner.xcscheme new file mode 100644 index 0000000..a28140c --- /dev/null +++ b/example/ios/Runner.xcodeproj/xcshareddata/xcschemes/Runner.xcscheme @@ -0,0 +1,91 @@ + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + diff --git a/example/ios/Runner.xcworkspace/contents.xcworkspacedata b/example/ios/Runner.xcworkspace/contents.xcworkspacedata new file mode 100644 index 0000000..1d526a1 --- /dev/null +++ b/example/ios/Runner.xcworkspace/contents.xcworkspacedata @@ -0,0 +1,7 @@ + + + + + diff --git a/example/ios/Runner.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist b/example/ios/Runner.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist new file mode 100644 index 0000000..18d9810 --- /dev/null +++ b/example/ios/Runner.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist @@ -0,0 +1,8 @@ + + + + + IDEDidComputeMac32BitWarning + + + diff --git a/example/ios/Runner.xcworkspace/xcshareddata/WorkspaceSettings.xcsettings b/example/ios/Runner.xcworkspace/xcshareddata/WorkspaceSettings.xcsettings new file mode 100644 index 0000000..f9b0d7c --- /dev/null +++ b/example/ios/Runner.xcworkspace/xcshareddata/WorkspaceSettings.xcsettings @@ -0,0 +1,8 @@ + + + + + PreviewsEnabled + + + diff --git a/example/ios/Runner/AppDelegate.swift b/example/ios/Runner/AppDelegate.swift new file mode 100644 index 0000000..70693e4 --- /dev/null +++ b/example/ios/Runner/AppDelegate.swift @@ -0,0 +1,13 @@ +import UIKit +import Flutter + +@UIApplicationMain +@objc class AppDelegate: FlutterAppDelegate { + override func application( + _ application: UIApplication, + didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]? + ) -> Bool { + GeneratedPluginRegistrant.register(with: self) + return super.application(application, didFinishLaunchingWithOptions: launchOptions) + } +} diff --git a/example/ios/Runner/Assets.xcassets/AppIcon.appiconset/Contents.json b/example/ios/Runner/Assets.xcassets/AppIcon.appiconset/Contents.json new file mode 100644 index 0000000..d36b1fa --- /dev/null +++ b/example/ios/Runner/Assets.xcassets/AppIcon.appiconset/Contents.json @@ -0,0 +1,122 @@ +{ + "images" : [ + { + "size" : "20x20", + "idiom" : "iphone", + "filename" : 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0000000..89c2725 --- /dev/null +++ b/example/ios/Runner/Assets.xcassets/LaunchImage.imageset/README.md @@ -0,0 +1,5 @@ +# Launch Screen Assets + +You can customize the launch screen with your own desired assets by replacing the image files in this directory. + +You can also do it by opening your Flutter project's Xcode project with `open ios/Runner.xcworkspace`, selecting `Runner/Assets.xcassets` in the Project Navigator and dropping in the desired images. \ No newline at end of file diff --git a/example/ios/Runner/Base.lproj/LaunchScreen.storyboard b/example/ios/Runner/Base.lproj/LaunchScreen.storyboard new file mode 100644 index 0000000..f2e259c --- /dev/null +++ b/example/ios/Runner/Base.lproj/LaunchScreen.storyboard @@ -0,0 +1,37 @@ + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + diff --git a/example/ios/Runner/Base.lproj/Main.storyboard b/example/ios/Runner/Base.lproj/Main.storyboard new file mode 100644 index 0000000..f3c2851 --- /dev/null +++ b/example/ios/Runner/Base.lproj/Main.storyboard @@ -0,0 +1,26 @@ + + + + + + + + + + + + + + + + + + + + + + + + + + diff --git a/example/ios/Runner/Info.plist b/example/ios/Runner/Info.plist new file mode 100644 index 0000000..a060db6 --- /dev/null +++ b/example/ios/Runner/Info.plist @@ -0,0 +1,45 @@ + + + + + CFBundleDevelopmentRegion + $(DEVELOPMENT_LANGUAGE) + CFBundleExecutable + $(EXECUTABLE_NAME) + CFBundleIdentifier + $(PRODUCT_BUNDLE_IDENTIFIER) + CFBundleInfoDictionaryVersion + 6.0 + CFBundleName + example + CFBundlePackageType + APPL + CFBundleShortVersionString + $(FLUTTER_BUILD_NAME) + CFBundleSignature + ???? + CFBundleVersion + $(FLUTTER_BUILD_NUMBER) + LSRequiresIPhoneOS + + UILaunchStoryboardName + LaunchScreen + UIMainStoryboardFile + Main + UISupportedInterfaceOrientations + + UIInterfaceOrientationPortrait + UIInterfaceOrientationLandscapeLeft + UIInterfaceOrientationLandscapeRight + + UISupportedInterfaceOrientations~ipad + + UIInterfaceOrientationPortrait + UIInterfaceOrientationPortraitUpsideDown + UIInterfaceOrientationLandscapeLeft + UIInterfaceOrientationLandscapeRight + + UIViewControllerBasedStatusBarAppearance + + + diff --git a/example/ios/Runner/Runner-Bridging-Header.h b/example/ios/Runner/Runner-Bridging-Header.h new file mode 100644 index 0000000..308a2a5 --- /dev/null +++ b/example/ios/Runner/Runner-Bridging-Header.h @@ -0,0 +1 @@ +#import "GeneratedPluginRegistrant.h" diff --git a/example/dynamic_horizontal.dart b/example/lib/dynamic_horizontal.dart similarity index 97% rename from example/dynamic_horizontal.dart rename to example/lib/dynamic_horizontal.dart index 1e4467e..54d72b2 100644 --- a/example/dynamic_horizontal.dart +++ b/example/lib/dynamic_horizontal.dart @@ -3,8 +3,6 @@ import 'dart:math'; import 'package:flutter/material.dart'; import 'package:scroll_snap_list/scroll_snap_list.dart'; -void main() => runApp(DynamicHorizontalDemo()); - class DynamicHorizontalDemo extends StatefulWidget { @override _DynamicHorizontalDemoState createState() => _DynamicHorizontalDemoState(); @@ -92,6 +90,7 @@ class _DynamicHorizontalDemoState extends State { Expanded( child: ScrollSnapList( onItemFocus: _onItemFocus, + selectedItemAnchor: SelectedItemAnchor.start, itemExtent: 150, itemBuilder: _buildListItem, itemCount: data.length, diff --git a/example/horizontal_jumbotron.dart b/example/lib/horizontal_jumbotron.dart similarity index 62% rename from example/horizontal_jumbotron.dart rename to example/lib/horizontal_jumbotron.dart index eaa2573..7c9fccc 100644 --- a/example/horizontal_jumbotron.dart +++ b/example/lib/horizontal_jumbotron.dart @@ -3,8 +3,6 @@ import 'dart:math'; import 'package:flutter/material.dart'; import 'package:scroll_snap_list/scroll_snap_list.dart'; -void main() => runApp(HorizontalListJumboDemo()); - class HorizontalListJumboDemo extends StatefulWidget { @override _HorizontalListJumboDemoState createState() => _HorizontalListJumboDemoState(); @@ -13,7 +11,7 @@ class HorizontalListJumboDemo extends StatefulWidget { class _HorizontalListJumboDemoState extends State { List data = []; int _focusedIndex = 0; - GlobalKey sslKey = GlobalKey(); + final controller = SnapScrollListController(itemExtent: 360); @override void initState() { @@ -51,7 +49,7 @@ class _HorizontalListJumboDemoState extends State { color: Colors.lightBlueAccent, child: InkWell( onTap: () { - sslKey.currentState!.focusToItem(index); + controller.animateToIndex(index); }, child: Text("Child index $index"), ), @@ -61,30 +59,34 @@ class _HorizontalListJumboDemoState extends State { @override Widget build(BuildContext context) { - return MaterialApp( - title: 'Jumbo List Demo', - home: Scaffold( - appBar: AppBar( - title: Text("Jumbo List"), - ), - body: Container( - child: Column( - children: [ - Expanded( - child: ScrollSnapList( - margin: EdgeInsets.symmetric(vertical: 10), - onItemFocus: _onItemFocus, - itemExtent: 360, - itemBuilder: _buildListItem, - itemCount: data.length, - key: sslKey, - ), + return Scaffold( + appBar: AppBar( + title: Text("Jumbo List"), + ), + body: Container( + child: Column( + children: [ + Expanded( + child: ScrollSnapList( + scrollController: controller, + snapOnScroll: true, + selectedItemAnchor: SelectedItemAnchor.middle, + margin: EdgeInsets.symmetric(vertical: 10), + onItemFocus: _onItemFocus, + itemBuilder: _buildListItem, + itemCount: data.length, ), - _buildItemDetail(), - ], - ), + ), + _buildItemDetail(), + ], ), ), ); } + + @override + void dispose() { + controller.dispose(); + super.dispose(); + } } diff --git a/example/horizontal_list.dart b/example/lib/horizontal_list.dart similarity index 98% rename from example/horizontal_list.dart rename to example/lib/horizontal_list.dart index 085be0e..45370f7 100644 --- a/example/horizontal_list.dart +++ b/example/lib/horizontal_list.dart @@ -3,8 +3,6 @@ import 'dart:math'; import 'package:flutter/material.dart'; import 'package:scroll_snap_list/scroll_snap_list.dart'; -void main() => runApp(HorizontalListDemo()); - class HorizontalListDemo extends StatefulWidget { @override _HorizontalListDemoState createState() => _HorizontalListDemoState(); @@ -96,6 +94,7 @@ class _HorizontalListDemoState extends State { child: ScrollSnapList( onItemFocus: _onItemFocus, onReachEnd: _loadMoreData, + selectedItemAnchor: SelectedItemAnchor.start, itemExtent: 35, itemBuilder: _buildListItem, itemCount: _isLoading ? data.length + 1 : data.length, diff --git a/example/lib/main.dart b/example/lib/main.dart new file mode 100644 index 0000000..71bee68 --- /dev/null +++ b/example/lib/main.dart @@ -0,0 +1,41 @@ +import 'package:flutter/material.dart'; + +import 'dynamic_horizontal.dart'; +import 'horizontal_jumbotron.dart'; +import 'horizontal_list.dart'; +import 'tab_with_horizontal.dart'; +import 'vertical_list.dart'; + +void main() => runApp(const SnapScrollListDemo()); + +class SnapScrollListDemo extends StatelessWidget { + const SnapScrollListDemo({Key? key}) : super(key: key); + + @override + Widget build(BuildContext context) { + return MaterialApp( + home: Builder( + builder: (context) => Scaffold( + body: ListView( + children: [ + _buildTile(context, DynamicHorizontalDemo()), + _buildTile(context, HorizontalListJumboDemo()), + _buildTile(context, HorizontalListDemo()), + _buildTile(context, TabWithHorizontalListDemo()), + _buildTile(context, VerticalListDemo()), + ], + ), + ), + ), + ); + } + + Widget _buildTile(BuildContext context, Widget page) { + return ListTile( + title: Text(page.runtimeType.toString()), + onTap: () => Navigator.of(context).push( + MaterialPageRoute(builder: (_) => page), + ), + ); + } +} diff --git a/example/tab_with_horizontal.dart b/example/lib/tab_with_horizontal.dart similarity index 90% rename from example/tab_with_horizontal.dart rename to example/lib/tab_with_horizontal.dart index a62b116..97badde 100644 --- a/example/tab_with_horizontal.dart +++ b/example/lib/tab_with_horizontal.dart @@ -1,8 +1,6 @@ import 'package:flutter/material.dart'; import 'package:scroll_snap_list/scroll_snap_list.dart'; -void main() => runApp(TabWithHorizontalListDemo()); - class TabWithHorizontalListDemo extends StatelessWidget { final List _tabScreen = [ HorizontalListJumbo( @@ -53,7 +51,7 @@ class HorizontalListJumbo extends StatefulWidget { class _HorizontalListJumboState extends State { List data = []; int _focusedIndex = 0; - GlobalKey sslKey = GlobalKey(); + final controller = SnapScrollListController(itemExtent: 360); @override void initState() { @@ -91,7 +89,7 @@ class _HorizontalListJumboState extends State { color: Colors.lightBlueAccent, child: InkWell( onTap: () { - sslKey.currentState!.focusToItem(index); + controller.animateToIndex(index); }, child: Text("Child index $index"), ), @@ -106,12 +104,12 @@ class _HorizontalListJumboState extends State { children: [ Expanded( child: ScrollSnapList( + scrollController: controller, margin: EdgeInsets.symmetric(vertical: 10), onItemFocus: _onItemFocus, - itemExtent: 360, + selectedItemAnchor: SelectedItemAnchor.start, itemBuilder: _buildListItem, itemCount: data.length, - key: sslKey, listViewKey: widget.key, ), ), @@ -120,4 +118,10 @@ class _HorizontalListJumboState extends State { ), ); } + + @override + void dispose() { + controller.dispose(); + super.dispose(); + } } diff --git a/example/vertical_list.dart b/example/lib/vertical_list.dart similarity index 87% rename from example/vertical_list.dart rename to example/lib/vertical_list.dart index c9edc3a..f00f1c4 100644 --- a/example/vertical_list.dart +++ b/example/lib/vertical_list.dart @@ -1,8 +1,6 @@ import 'package:flutter/material.dart'; import 'package:scroll_snap_list/scroll_snap_list.dart'; -void main() => runApp(VerticalListDemo()); - class VerticalListDemo extends StatefulWidget { @override _VerticalListDemoState createState() => _VerticalListDemoState(); @@ -11,7 +9,7 @@ class VerticalListDemo extends StatefulWidget { class _VerticalListDemoState extends State { List data = []; int _focusedIndex = 0; - GlobalKey sslKey = GlobalKey(); + final controller = SnapScrollListController(itemExtent: 50); @override void initState() { @@ -53,7 +51,7 @@ class _VerticalListDemoState extends State { print("Do anything here"); //trigger focus manually - sslKey.currentState!.focusToItem(index); + controller.animateToIndex(index); }, ), ), @@ -80,13 +78,12 @@ class _VerticalListDemoState extends State { width: 250, height: 300, child: ScrollSnapList( + scrollController: controller, onItemFocus: _onItemFocus, - itemExtent: 50, - // selectedItemAnchor: SelectedItemAnchor.START, //to change item anchor uncomment this line + selectedItemAnchor: SelectedItemAnchor.start, // dynamicItemOpacity: 0.3, //to set unselected item opacity uncomment this line itemBuilder: _buildListItem, itemCount: data.length, - key: sslKey, scrollDirection: Axis.vertical, ), ), @@ -101,4 +98,10 @@ class _VerticalListDemoState extends State { ), ); } + + @override + void dispose() { + controller.dispose(); + super.dispose(); + } } diff --git a/example/pubspec.lock b/example/pubspec.lock new file mode 100644 index 0000000..ec65486 --- /dev/null +++ b/example/pubspec.lock @@ -0,0 +1,160 @@ +# Generated by pub +# See https://dart.dev/tools/pub/glossary#lockfile +packages: + async: + dependency: transitive + description: + name: async + url: "https://pub.dartlang.org" + source: hosted + version: "2.5.0" + boolean_selector: + dependency: transitive + description: + name: boolean_selector + url: "https://pub.dartlang.org" + source: hosted + version: "2.1.0" + characters: + dependency: transitive + description: + name: characters + url: "https://pub.dartlang.org" + source: hosted + version: "1.1.0" + charcode: + dependency: transitive + description: + name: charcode + url: "https://pub.dartlang.org" + source: hosted + version: "1.2.0" + clock: + dependency: transitive + description: + name: clock + url: "https://pub.dartlang.org" + source: hosted + version: "1.1.0" + collection: + dependency: transitive + description: + name: collection + url: "https://pub.dartlang.org" + source: hosted + version: "1.15.0" + cupertino_icons: + dependency: "direct main" + description: + name: cupertino_icons + url: "https://pub.dartlang.org" + source: hosted + version: "1.0.3" + fake_async: + dependency: transitive + description: + name: fake_async + url: "https://pub.dartlang.org" + source: hosted + version: "1.2.0" + flutter: + dependency: "direct main" + description: flutter + source: sdk + version: "0.0.0" + flutter_test: + dependency: "direct dev" + description: flutter + source: sdk + version: "0.0.0" + matcher: + dependency: transitive + description: + name: matcher + url: "https://pub.dartlang.org" + source: hosted + version: "0.12.10" + meta: + dependency: transitive + description: + name: meta + url: "https://pub.dartlang.org" + source: hosted + version: "1.3.0" + path: + dependency: transitive + description: + name: path + url: "https://pub.dartlang.org" + source: hosted + version: "1.8.0" + scroll_snap_list: + dependency: "direct main" + description: + path: ".." + relative: true + source: path + version: "0.7.0" + sky_engine: + dependency: transitive + description: flutter + source: sdk + version: "0.0.99" + source_span: + dependency: transitive + description: + name: source_span + url: "https://pub.dartlang.org" + source: hosted + version: "1.8.0" + stack_trace: + dependency: transitive + description: + name: stack_trace + url: "https://pub.dartlang.org" + source: hosted + version: "1.10.0" + stream_channel: + dependency: transitive + description: + name: stream_channel + url: "https://pub.dartlang.org" + source: hosted + version: "2.1.0" + string_scanner: + dependency: transitive + description: + name: string_scanner + url: "https://pub.dartlang.org" + source: hosted + version: "1.1.0" + term_glyph: + dependency: transitive + description: + name: term_glyph + url: "https://pub.dartlang.org" + source: hosted + version: "1.2.0" + test_api: + dependency: transitive + description: + name: test_api + url: "https://pub.dartlang.org" + source: hosted + version: "0.2.19" + typed_data: + dependency: transitive + description: + name: typed_data + url: "https://pub.dartlang.org" + source: hosted + version: "1.3.0" + vector_math: + dependency: transitive + description: + name: vector_math + url: "https://pub.dartlang.org" + source: hosted + version: "2.1.0" +sdks: + dart: ">=2.12.0 <3.0.0" diff --git a/example/pubspec.yaml b/example/pubspec.yaml new file mode 100644 index 0000000..d9120f3 --- /dev/null +++ b/example/pubspec.yaml @@ -0,0 +1,72 @@ +name: example +description: A new Flutter project. + +# The following line prevents the package from being accidentally published to +# pub.dev using `pub publish`. This is preferred for private packages. +publish_to: "none" # Remove this line if you wish to publish to pub.dev + +# The following defines the version and build number for your application. +# A version number is three numbers separated by dots, like 1.2.43 +# followed by an optional build number separated by a +. +# Both the version and the builder number may be overridden in flutter +# build by specifying --build-name and --build-number, respectively. +# In Android, build-name is used as versionName while build-number used as versionCode. +# Read more about Android versioning at https://developer.android.com/studio/publish/versioning +# In iOS, build-name is used as CFBundleShortVersionString while build-number used as CFBundleVersion. +# Read more about iOS versioning at +# https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html +version: 1.0.0+1 + +environment: + sdk: ">=2.12.0 <3.0.0" + +dependencies: + flutter: + sdk: flutter + scroll_snap_list: + path: ./.. + + # The following adds the Cupertino Icons font to your application. + # Use with the CupertinoIcons class for iOS style icons. + cupertino_icons: ^1.0.2 + +dev_dependencies: + flutter_test: + sdk: flutter + +# For information on the generic Dart part of this file, see the +# following page: https://dart.dev/tools/pub/pubspec + +# The following section is specific to Flutter. +flutter: + # The following line ensures that the Material Icons font is + # included with your application, so that you can use the icons in + # the material Icons class. + uses-material-design: true + # To add assets to your application, add an assets section, like this: + # assets: + # - images/a_dot_burr.jpeg + # - images/a_dot_ham.jpeg + # An image asset can refer to one or more resolution-specific "variants", see + # https://flutter.dev/assets-and-images/#resolution-aware. + # For details regarding adding assets from package dependencies, see + # https://flutter.dev/assets-and-images/#from-packages + # To add custom fonts to your application, add a fonts section here, + # in this "flutter" section. 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"#0175C2", + "theme_color": "#0175C2", + "description": "A new Flutter project.", + "orientation": "portrait-primary", + "prefer_related_applications": false, + "icons": [ + { + "src": "icons/Icon-192.png", + "sizes": "192x192", + "type": "image/png" + }, + { + "src": "icons/Icon-512.png", + "sizes": "512x512", + "type": "image/png" + } + ] +} diff --git a/lib/scroll_snap_list.dart b/lib/scroll_snap_list.dart index 936fe66..aeb1c66 100644 --- a/lib/scroll_snap_list.dart +++ b/lib/scroll_snap_list.dart @@ -132,8 +132,8 @@ class ScrollSnapList extends StatefulWidget { this.selectedItemAnchor, this.listPadding, this.scrollPhysics, - }) : assert((listPadding == null) != (selectedItemAnchor == null)), - assert((scrollController == null) != (itemExtent == null)), + }) : assert((listPadding == null) != (selectedItemAnchor == null), 'Exactly one parameter must me set.'), + assert((scrollController == null) != (itemExtent == null), 'Exactly one parameter must me set.'), super(key: key); @override From 056e21618e748ae7337165521fc25905493fee89 Mon Sep 17 00:00:00 2001 From: Svetozar Volkov Date: Thu, 20 May 2021 10:48:40 +0300 Subject: [PATCH 5/9] made state methods and fields private --- lib/scroll_snap_list.dart | 81 ++++++++++++++++++++------------------- 1 file changed, 41 insertions(+), 40 deletions(-) diff --git a/lib/scroll_snap_list.dart b/lib/scroll_snap_list.dart index aeb1c66..cbdd33f 100644 --- a/lib/scroll_snap_list.dart +++ b/lib/scroll_snap_list.dart @@ -2,6 +2,7 @@ library scroll_snap_list; import 'dart:math'; +import 'package:flutter/gestures.dart'; import 'package:flutter/material.dart'; ///Anchor location for selected item in the list @@ -141,29 +142,29 @@ class ScrollSnapList extends StatefulWidget { } class ScrollSnapListState extends State { - late final SnapScrollListController scrollController; - late final double itemExtent; + late final SnapScrollListController _scrollController; + late final double _itemExtent; /// true if initialIndex exists and first drag hasn't occurred - bool waitingForFirstDrag = true; + bool _waitingForFirstDrag = true; //to avoid multiple onItemFocus when using updateOnScroll - int previousIndex = -1; + int _previousIndex = -1; //Current scroll-position in pixel - double currentPixel = 0; + double _currentPixel = 0; bool _programmaticallyControlledScrollInProgress = false; void initState() { super.initState(); - scrollController = widget.scrollController ?? SnapScrollListController(itemExtent: widget.itemExtent!); - itemExtent = widget.itemExtent ?? scrollController.itemExtent; - scrollController._attach(this); + _scrollController = widget.scrollController ?? SnapScrollListController(itemExtent: widget.itemExtent!); + _itemExtent = widget.itemExtent ?? _scrollController.itemExtent; + _scrollController._attach(this); WidgetsBinding.instance!.addPostFrameCallback((_) { if (widget.initialIndex != null) { //set list's initial position - focusToInitialPosition(); + _focusToInitialPosition(); } else { - waitingForFirstDrag = false; + _waitingForFirstDrag = false; } }); @@ -171,17 +172,17 @@ class ScrollSnapListState extends State { Future.delayed(Duration(milliseconds: 10), () { if (this.mounted) { setState(() { - waitingForFirstDrag = false; + _waitingForFirstDrag = false; }); } }); } ///Calculate scale transformation for dynamic item size - double calculateScale(int index) { + double _calculateScale(int index) { //scroll-pixel position for index to be at the center of ScrollSnapList - double intendedPixel = index * itemExtent; - double difference = intendedPixel - currentPixel; + double intendedPixel = index * _itemExtent; + double difference = intendedPixel - _currentPixel; if (widget.dynamicSizeEquation != null) { //force to be >= 0 @@ -194,10 +195,10 @@ class ScrollSnapListState extends State { } ///Calculate opacity transformation for dynamic item opacity - double calculateOpacity(int index) { + double _calculateOpacity(int index) { //scroll-pixel position for index to be at the center of ScrollSnapList - double intendedPixel = index * itemExtent; - double difference = intendedPixel - currentPixel; + double intendedPixel = index * _itemExtent; + double difference = intendedPixel - _currentPixel; return (difference == 0) ? 1.0 : widget.dynamicItemOpacity ?? 1.0; } @@ -206,7 +207,7 @@ class ScrollSnapListState extends State { Widget child; if (widget.dynamicItemSize) { child = Transform.scale( - scale: calculateScale(index), + scale: _calculateScale(index), child: widget.itemBuilder(context, index), ); } else { @@ -214,7 +215,7 @@ class ScrollSnapListState extends State { } if (widget.dynamicItemOpacity != null) { - child = Opacity(child: child, opacity: calculateOpacity(index)); + child = Opacity(child: child, opacity: _calculateOpacity(index)); } return child; @@ -223,8 +224,8 @@ class ScrollSnapListState extends State { int _calcCardIndex(double pixel, double itemExtent) => ((pixel - itemExtent / 2) / itemExtent).ceil(); ///Determine location if initialIndex is set - void focusToInitialPosition() { - scrollController.jumpTo((widget.initialIndex! * itemExtent)); + void _focusToInitialPosition() { + _scrollController.jumpTo((widget.initialIndex! * _itemExtent)); } ///Trigger callback on reach end-of-list @@ -235,7 +236,7 @@ class ScrollSnapListState extends State { @override void dispose() { if (widget.scrollController == null) { - scrollController.dispose(); + _scrollController.dispose(); } super.dispose(); } @@ -260,11 +261,11 @@ class ScrollSnapListState extends State { case SelectedItemAnchor.middle: _listPadding = (widget.scrollDirection == Axis.horizontal ? constraint.maxWidth : constraint.maxHeight) / 2 - - itemExtent / 2; + _itemExtent / 2; break; case SelectedItemAnchor.end: - _listPadding = - (widget.scrollDirection == Axis.horizontal ? constraint.maxWidth : constraint.maxHeight) - itemExtent; + _listPadding = (widget.scrollDirection == Axis.horizontal ? constraint.maxWidth : constraint.maxHeight) - + _itemExtent; break; } @@ -275,50 +276,50 @@ class ScrollSnapListState extends State { onNotification: (ScrollNotification scrollInfo) { if (scrollInfo is ScrollEndNotification) { // don't snap until first drag - if (waitingForFirstDrag || _programmaticallyControlledScrollInProgress) { + if (_waitingForFirstDrag || _programmaticallyControlledScrollInProgress) { return true; } - double tolerance = widget.endOfListTolerance ?? (itemExtent / 2); + double tolerance = widget.endOfListTolerance ?? (_itemExtent / 2); if (scrollInfo.metrics.pixels >= scrollInfo.metrics.maxScrollExtent - tolerance) { _onReachEnd(); } - final index = _calcCardIndex(scrollInfo.metrics.pixels, itemExtent); - if (index != previousIndex) { - previousIndex = index; + final index = _calcCardIndex(scrollInfo.metrics.pixels, _itemExtent); + if (index != _previousIndex) { + _previousIndex = index; if (widget.onItemFocus != null) widget.onItemFocus!(index); - if (waitingForFirstDrag || _programmaticallyControlledScrollInProgress) { + if (_waitingForFirstDrag || _programmaticallyControlledScrollInProgress) { return true; } - if (waitingForFirstDrag == false) { - Future.delayed(Duration.zero, () => scrollController.animateToIndex(index)); + if (_waitingForFirstDrag == false) { + Future.delayed(Duration.zero, () => _scrollController.animateToIndex(index)); } } } else if (scrollInfo is ScrollUpdateNotification) { //save pixel position for scale-effect if (widget.dynamicItemSize || widget.dynamicItemOpacity != null) { setState(() { - currentPixel = scrollInfo.metrics.pixels; + _currentPixel = scrollInfo.metrics.pixels; }); } - final index = _calcCardIndex(scrollInfo.metrics.pixels, itemExtent); - if (index != previousIndex) { - previousIndex = index; + final index = _calcCardIndex(scrollInfo.metrics.pixels, _itemExtent); + if (index != _previousIndex) { + _previousIndex = index; if (widget.onItemFocus != null) widget.onItemFocus!(index); if (widget.snapOnScroll) { - if (waitingForFirstDrag || _programmaticallyControlledScrollInProgress) { + if (_waitingForFirstDrag || _programmaticallyControlledScrollInProgress) { return true; } - if (waitingForFirstDrag == false) { - Future.delayed(Duration.zero, () => scrollController.animateToIndex(index)); + if (_waitingForFirstDrag == false) { + Future.delayed(Duration.zero, () => _scrollController.animateToIndex(index)); } } } From 8d5e5677890106a014c2d7d7f6be49903660b9d1 Mon Sep 17 00:00:00 2001 From: Svetozar Volkov Date: Fri, 22 Oct 2021 11:44:41 +0300 Subject: [PATCH 6/9] bug fixes fixed bug when first drag is interrapted fixed item snapping on scroll end --- lib/scroll_snap_list.dart | 99 ++++++++++++++++++++------------------- 1 file changed, 50 insertions(+), 49 deletions(-) diff --git a/lib/scroll_snap_list.dart b/lib/scroll_snap_list.dart index cbdd33f..fdea55d 100644 --- a/lib/scroll_snap_list.dart +++ b/lib/scroll_snap_list.dart @@ -2,7 +2,6 @@ library scroll_snap_list; import 'dart:math'; -import 'package:flutter/gestures.dart'; import 'package:flutter/material.dart'; ///Anchor location for selected item in the list @@ -142,29 +141,29 @@ class ScrollSnapList extends StatefulWidget { } class ScrollSnapListState extends State { - late final SnapScrollListController _scrollController; - late final double _itemExtent; + late final SnapScrollListController scrollController; + late final double itemExtent; /// true if initialIndex exists and first drag hasn't occurred - bool _waitingForFirstDrag = true; + bool waitingForFirstDrag = true; //to avoid multiple onItemFocus when using updateOnScroll - int _previousIndex = -1; + int previousIndex = 0; //Current scroll-position in pixel - double _currentPixel = 0; + double currentPixel = 0; bool _programmaticallyControlledScrollInProgress = false; void initState() { super.initState(); - _scrollController = widget.scrollController ?? SnapScrollListController(itemExtent: widget.itemExtent!); - _itemExtent = widget.itemExtent ?? _scrollController.itemExtent; - _scrollController._attach(this); + scrollController = widget.scrollController ?? SnapScrollListController(itemExtent: widget.itemExtent!); + itemExtent = widget.itemExtent ?? scrollController.itemExtent; + scrollController._attach(this); WidgetsBinding.instance!.addPostFrameCallback((_) { if (widget.initialIndex != null) { //set list's initial position - _focusToInitialPosition(); + focusToInitialPosition(); } else { - _waitingForFirstDrag = false; + waitingForFirstDrag = false; } }); @@ -172,17 +171,17 @@ class ScrollSnapListState extends State { Future.delayed(Duration(milliseconds: 10), () { if (this.mounted) { setState(() { - _waitingForFirstDrag = false; + waitingForFirstDrag = false; }); } }); } ///Calculate scale transformation for dynamic item size - double _calculateScale(int index) { + double calculateScale(int index) { //scroll-pixel position for index to be at the center of ScrollSnapList - double intendedPixel = index * _itemExtent; - double difference = intendedPixel - _currentPixel; + double intendedPixel = index * itemExtent; + double difference = intendedPixel - currentPixel; if (widget.dynamicSizeEquation != null) { //force to be >= 0 @@ -195,10 +194,10 @@ class ScrollSnapListState extends State { } ///Calculate opacity transformation for dynamic item opacity - double _calculateOpacity(int index) { + double calculateOpacity(int index) { //scroll-pixel position for index to be at the center of ScrollSnapList - double intendedPixel = index * _itemExtent; - double difference = intendedPixel - _currentPixel; + double intendedPixel = index * itemExtent; + double difference = intendedPixel - currentPixel; return (difference == 0) ? 1.0 : widget.dynamicItemOpacity ?? 1.0; } @@ -207,7 +206,7 @@ class ScrollSnapListState extends State { Widget child; if (widget.dynamicItemSize) { child = Transform.scale( - scale: _calculateScale(index), + scale: calculateScale(index), child: widget.itemBuilder(context, index), ); } else { @@ -215,7 +214,7 @@ class ScrollSnapListState extends State { } if (widget.dynamicItemOpacity != null) { - child = Opacity(child: child, opacity: _calculateOpacity(index)); + child = Opacity(child: child, opacity: calculateOpacity(index)); } return child; @@ -224,8 +223,8 @@ class ScrollSnapListState extends State { int _calcCardIndex(double pixel, double itemExtent) => ((pixel - itemExtent / 2) / itemExtent).ceil(); ///Determine location if initialIndex is set - void _focusToInitialPosition() { - _scrollController.jumpTo((widget.initialIndex! * _itemExtent)); + void focusToInitialPosition() { + scrollController.jumpTo((widget.initialIndex! * itemExtent)); } ///Trigger callback on reach end-of-list @@ -236,7 +235,7 @@ class ScrollSnapListState extends State { @override void dispose() { if (widget.scrollController == null) { - _scrollController.dispose(); + scrollController.dispose(); } super.dispose(); } @@ -261,11 +260,11 @@ class ScrollSnapListState extends State { case SelectedItemAnchor.middle: _listPadding = (widget.scrollDirection == Axis.horizontal ? constraint.maxWidth : constraint.maxHeight) / 2 - - _itemExtent / 2; + itemExtent / 2; break; case SelectedItemAnchor.end: - _listPadding = (widget.scrollDirection == Axis.horizontal ? constraint.maxWidth : constraint.maxHeight) - - _itemExtent; + _listPadding = + (widget.scrollDirection == Axis.horizontal ? constraint.maxWidth : constraint.maxHeight) - itemExtent; break; } @@ -276,50 +275,46 @@ class ScrollSnapListState extends State { onNotification: (ScrollNotification scrollInfo) { if (scrollInfo is ScrollEndNotification) { // don't snap until first drag - if (_waitingForFirstDrag || _programmaticallyControlledScrollInProgress) { + if (waitingForFirstDrag || _programmaticallyControlledScrollInProgress) { return true; } - double tolerance = widget.endOfListTolerance ?? (_itemExtent / 2); + double tolerance = widget.endOfListTolerance ?? (itemExtent / 2); if (scrollInfo.metrics.pixels >= scrollInfo.metrics.maxScrollExtent - tolerance) { _onReachEnd(); } - final index = _calcCardIndex(scrollInfo.metrics.pixels, _itemExtent); - if (index != _previousIndex) { - _previousIndex = index; + final index = _calcCardIndex(scrollInfo.metrics.pixels, itemExtent); + if (index != previousIndex) { + previousIndex = index; if (widget.onItemFocus != null) widget.onItemFocus!(index); + } - if (_waitingForFirstDrag || _programmaticallyControlledScrollInProgress) { - return true; - } - - if (_waitingForFirstDrag == false) { - Future.delayed(Duration.zero, () => _scrollController.animateToIndex(index)); - } + if (waitingForFirstDrag || _programmaticallyControlledScrollInProgress) { + return true; + } else { + Future.delayed(const Duration(milliseconds: 20), () => scrollController.animateToIndex(index)); } } else if (scrollInfo is ScrollUpdateNotification) { //save pixel position for scale-effect if (widget.dynamicItemSize || widget.dynamicItemOpacity != null) { setState(() { - _currentPixel = scrollInfo.metrics.pixels; + currentPixel = scrollInfo.metrics.pixels; }); } - final index = _calcCardIndex(scrollInfo.metrics.pixels, _itemExtent); - if (index != _previousIndex) { - _previousIndex = index; + final index = _calcCardIndex(scrollInfo.metrics.pixels, itemExtent); + if (widget.snapOnScroll) { + if (index != previousIndex) { + previousIndex = index; - if (widget.onItemFocus != null) widget.onItemFocus!(index); + if (widget.onItemFocus != null) widget.onItemFocus!(index); - if (widget.snapOnScroll) { - if (_waitingForFirstDrag || _programmaticallyControlledScrollInProgress) { + if (waitingForFirstDrag || _programmaticallyControlledScrollInProgress) { return true; - } - - if (_waitingForFirstDrag == false) { - Future.delayed(Duration.zero, () => _scrollController.animateToIndex(index)); + } else { + Future.delayed(const Duration(milliseconds: 20), () => scrollController.animateToIndex(index)); } } } @@ -366,6 +361,12 @@ class SnapScrollListController extends ScrollController { } void jumpToIndex(int index) { + assert(isAttached, 'This controller should be attached to SnapScrollList to perform scroll jumps.'); + if (index != _state!.previousIndex) { + _state!.previousIndex = index; + _state!.widget.onItemFocus?.call(index); + } + jumpTo(itemExtent * index); } From 6dc0e023327e05caa2bf9e563ccd638e62435992 Mon Sep 17 00:00:00 2001 From: Svetozar Volkov Date: Fri, 22 Oct 2021 12:05:41 +0300 Subject: [PATCH 7/9] made itemExtent in controller optional --- lib/scroll_snap_list.dart | 20 +++++++++++++++++--- 1 file changed, 17 insertions(+), 3 deletions(-) diff --git a/lib/scroll_snap_list.dart b/lib/scroll_snap_list.dart index fdea55d..380d169 100644 --- a/lib/scroll_snap_list.dart +++ b/lib/scroll_snap_list.dart @@ -134,6 +134,10 @@ class ScrollSnapList extends StatefulWidget { this.scrollPhysics, }) : assert((listPadding == null) != (selectedItemAnchor == null), 'Exactly one parameter must me set.'), assert((scrollController == null) != (itemExtent == null), 'Exactly one parameter must me set.'), + assert( + itemExtent != null || scrollController?._itemExtent != null, + 'ItemExtent should be privided to either [scrollController] or widget.', + ), super(key: key); @override @@ -156,7 +160,7 @@ class ScrollSnapListState extends State { void initState() { super.initState(); scrollController = widget.scrollController ?? SnapScrollListController(itemExtent: widget.itemExtent!); - itemExtent = widget.itemExtent ?? scrollController.itemExtent; + itemExtent = widget.itemExtent ?? scrollController._itemExtent!; scrollController._attach(this); WidgetsBinding.instance!.addPostFrameCallback((_) { if (widget.initialIndex != null) { @@ -344,7 +348,7 @@ class ScrollSnapListState extends State { } class SnapScrollListController extends ScrollController { - SnapScrollListController({required this.itemExtent}); + SnapScrollListController({double? itemExtent}) : _itemExtent = itemExtent; ScrollSnapListState? _state; bool get isAttached => _state != null; @@ -353,8 +357,18 @@ class SnapScrollListController extends ScrollController { _state = state; } - final double itemExtent; + final double? _itemExtent; + double get itemExtent { + if (_itemExtent != null) { + return _itemExtent!; + } else { + assert(isAttached, 'To retrieve itemExtent from widget, this controller should be attached.'); + return _state!.widget.itemExtent!; + } + } + Future animateToIndex(int index, {Duration? duration, Curve? curve}) { + assert(isAttached, 'This controller should be attached to SnapScrollList to perform scroll animations.'); final scrollTarget = itemExtent * index; return animateTo(scrollTarget, duration: duration, curve: curve); From 99c0799d5e9e48b0b8dd3b158ecc252770bdaa36 Mon Sep 17 00:00:00 2001 From: Svetozar Volkov Date: Fri, 22 Oct 2021 12:37:37 +0300 Subject: [PATCH 8/9] fix assertion --- lib/scroll_snap_list.dart | 1 - 1 file changed, 1 deletion(-) diff --git a/lib/scroll_snap_list.dart b/lib/scroll_snap_list.dart index 380d169..299b8b2 100644 --- a/lib/scroll_snap_list.dart +++ b/lib/scroll_snap_list.dart @@ -133,7 +133,6 @@ class ScrollSnapList extends StatefulWidget { this.listPadding, this.scrollPhysics, }) : assert((listPadding == null) != (selectedItemAnchor == null), 'Exactly one parameter must me set.'), - assert((scrollController == null) != (itemExtent == null), 'Exactly one parameter must me set.'), assert( itemExtent != null || scrollController?._itemExtent != null, 'ItemExtent should be privided to either [scrollController] or widget.', From 069e2996f75345e1f9dd759e91fa2d1ad82a81c9 Mon Sep 17 00:00:00 2001 From: Svetozar Volkov Date: Fri, 22 Oct 2021 13:43:40 +0300 Subject: [PATCH 9/9] fixed calling onItemFocus during programmatically triggered scroll --- lib/scroll_snap_list.dart | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) diff --git a/lib/scroll_snap_list.dart b/lib/scroll_snap_list.dart index 299b8b2..2e1a953 100644 --- a/lib/scroll_snap_list.dart +++ b/lib/scroll_snap_list.dart @@ -309,16 +309,16 @@ class ScrollSnapListState extends State { final index = _calcCardIndex(scrollInfo.metrics.pixels, itemExtent); if (widget.snapOnScroll) { + if (waitingForFirstDrag || _programmaticallyControlledScrollInProgress) { + return true; + } + if (index != previousIndex) { previousIndex = index; if (widget.onItemFocus != null) widget.onItemFocus!(index); - if (waitingForFirstDrag || _programmaticallyControlledScrollInProgress) { - return true; - } else { - Future.delayed(const Duration(milliseconds: 20), () => scrollController.animateToIndex(index)); - } + Future.delayed(const Duration(milliseconds: 20), () => scrollController.animateToIndex(index)); } } }