Merge pull request #895 from AppFlowy-IO/feat/board_move_card_animation

Feat/board move card animation

frontend/app_flowy/packages/appflowy_board/CHANGELOG.md

@@ -1,16 +1,21 @@
+# 0.0.5
+* Optimize insert card animation
+* Enable insert card at the end of the column
+* Fix some bugs
+
 # 0.0.4
-* fix some bugs
+* Fix some bugs
 
 # 0.0.3
 * Support customize UI
 * Update example
 * Add AppFlowy style widget
 
-## 0.0.2
+# 0.0.2
 
 * Update documentation
 
-## 0.0.1
+# 0.0.1
 
 * Support drag and drop column
 * Support drag and drop column items from one to another

frontend/app_flowy/packages/appflowy_board/example/lib/multi_board_list_example.dart

@@ -26,13 +26,18 @@ class _MultiBoardListExampleState extends State<MultiBoardListExample> {
     List<AFColumnItem> a = [
       TextItem("Card 1"),
       TextItem("Card 2"),
-      // RichTextItem(title: "Card 3", subtitle: 'Aug 1, 2020 4:05 PM'),
+      RichTextItem(title: "Card 3", subtitle: 'Aug 1, 2020 4:05 PM'),
       TextItem("Card 4"),
+      TextItem("Card 5"),
+      TextItem("Card 6"),
+      RichTextItem(title: "Card 7", subtitle: 'Aug 1, 2020 4:05 PM'),
+      RichTextItem(title: "Card 8", subtitle: 'Aug 1, 2020 4:05 PM'),
+      TextItem("Card 9"),
     ];
     final column1 = AFBoardColumnData(id: "To Do", items: a);
     final column2 = AFBoardColumnData(id: "In Progress", items: <AFColumnItem>[
-      // RichTextItem(title: "Card 5", subtitle: 'Aug 1, 2020 4:05 PM'),
-      // TextItem("Card 6"),
+      RichTextItem(title: "Card 10", subtitle: 'Aug 1, 2020 4:05 PM'),
+      TextItem("Card 11"),
     ]);
 
     final column3 = AFBoardColumnData(id: "Done", items: <AFColumnItem>[]);
@@ -93,7 +98,7 @@ class _MultiBoardListExampleState extends State<MultiBoardListExample> {
       return Align(
         alignment: Alignment.centerLeft,
         child: Padding(
-          padding: const EdgeInsets.symmetric(horizontal: 20),
+          padding: const EdgeInsets.symmetric(horizontal: 20, vertical: 40),
           child: Text(item.s),
         ),
       );

frontend/app_flowy/packages/appflowy_board/lib/src/utils/log.dart

@@ -4,8 +4,6 @@ import 'package:flutter/material.dart';
 const DART_LOG = "Dart_LOG";
 
 class Log {
-  // static const enableLog = bool.hasEnvironment(DART_LOG);
-  // static final shared = Log();
   static const enableLog = false;
 
   static void info(String? message) {
@@ -16,19 +14,19 @@ class Log {
 
   static void debug(String? message) {
     if (enableLog) {
-      debugPrint('🐛[Debug]=> $message');
+      debugPrint('🐛[Debug] - ${DateTime.now().second}=> $message');
     }
   }
 
   static void warn(String? message) {
     if (enableLog) {
-      debugPrint('🐛[Warn]=> $message');
+      debugPrint('🐛[Warn] - ${DateTime.now().second} => $message');
     }
   }
 
   static void trace(String? message) {
     if (enableLog) {
-      // debugPrint('❗️[Trace]=> $message');
+      debugPrint('❗️[Trace] - ${DateTime.now().second}=> $message');
     }
   }
 }

frontend/app_flowy/packages/appflowy_board/lib/src/widgets/board.dart

@@ -159,7 +159,7 @@ class _BoardContentState extends State<BoardContent> {
           dataSource: widget.dataController,
           direction: Axis.horizontal,
           interceptor: interceptor,
-          children: _buildColumns(),
+          children: _buildColumns(interceptor.columnKeys),
         );
 
         return Stack(
@@ -191,7 +191,7 @@ class _BoardContentState extends State<BoardContent> {
     );
   }
 
-  List<Widget> _buildColumns() {
+  List<Widget> _buildColumns(List<ColumnKey> columnKeys) {
     final List<Widget> children =
         widget.dataController.columnDatas.asMap().entries.map(
       (item) {
@@ -208,21 +208,33 @@ class _BoardContentState extends State<BoardContent> {
           value: widget.dataController.columnController(columnData.id),
           child: Consumer<AFBoardColumnDataController>(
             builder: (context, value, child) {
+              final boardColumn = AFBoardColumnWidget(
+                margin: _marginFromIndex(columnIndex),
+                itemMargin: widget.config.columnItemPadding,
+                headerBuilder: widget.headerBuilder,
+                footBuilder: widget.footBuilder,
+                cardBuilder: widget.cardBuilder,
+                dataSource: dataSource,
+                scrollController: ScrollController(),
+                phantomController: widget.phantomController,
+                onReorder: widget.dataController.moveColumnItem,
+                cornerRadius: widget.config.cornerRadius,
+                backgroundColor: widget.config.columnBackgroundColor,
+              );
+
+              // columnKeys
+              //     .removeWhere((element) => element.columnId == columnData.id);
+
+              // columnKeys.add(
+              //   ColumnKey(
+              //     columnId: columnData.id,
+              //     key: boardColumn.columnGlobalKey,
+              //   ),
+              // );
+
               return ConstrainedBox(
                 constraints: widget.columnConstraints,
-                child: AFBoardColumnWidget(
-                  margin: _marginFromIndex(columnIndex),
-                  itemMargin: widget.config.columnItemPadding,
-                  headerBuilder: widget.headerBuilder,
-                  footBuilder: widget.footBuilder,
-                  cardBuilder: widget.cardBuilder,
-                  dataSource: dataSource,
-                  scrollController: ScrollController(),
-                  phantomController: widget.phantomController,
-                  onReorder: widget.dataController.moveColumnItem,
-                  cornerRadius: widget.config.cornerRadius,
-                  backgroundColor: widget.config.columnBackgroundColor,
-                ),
+                child: boardColumn,
               );
             },
           ),

frontend/app_flowy/packages/appflowy_board/lib/src/widgets/board_column/board_column.dart

@@ -87,7 +87,9 @@ class AFBoardColumnWidget extends StatefulWidget {
 
   final Color backgroundColor;
 
-  const AFBoardColumnWidget({
+  final GlobalKey columnGlobalKey = GlobalKey();
+
+  AFBoardColumnWidget({
     Key? key,
     this.headerBuilder,
     this.footBuilder,
@@ -136,8 +138,8 @@ class _AFBoardColumnWidgetState extends State<AFBoardColumnWidget> {
           draggableTargetBuilder: PhantomDraggableBuilder(),
         );
 
-        final reorderFlex = ReorderFlex(
-          key: widget.key,
+        Widget reorderFlex = ReorderFlex(
+          key: widget.columnGlobalKey,
           scrollController: widget.scrollController,
           config: widget.config,
           onDragStarted: (index) {
@@ -160,6 +162,9 @@ class _AFBoardColumnWidgetState extends State<AFBoardColumnWidget> {
           children: children,
         );
 
+        // reorderFlex =
+        //     KeyedSubtree(key: widget.columnGlobalKey, child: reorderFlex);
+
         return Container(
           margin: widget.margin,
           clipBehavior: Clip.hardEdge,

frontend/app_flowy/packages/appflowy_board/lib/src/widgets/board_data.dart

@@ -197,7 +197,8 @@ class AFBoardDataController extends ChangeNotifier
     assert(index != -1);
     if (index != -1) {
       if (index != newIndex) {
-        // Log.debug('[$BoardPhantomController] update $toColumnId:$index to $toColumnId:$phantomIndex');
+        Log.trace(
+            '[$BoardPhantomController] update $columnId:$index to $columnId:$newIndex');
         final item = columnDataController.removeAt(index, notify: false);
         columnDataController.insert(newIndex, item, notify: false);
       }

frontend/app_flowy/packages/appflowy_board/lib/src/widgets/reorder_flex/drag_state.dart

@@ -43,7 +43,7 @@ class FlexDragTargetData extends DragTargetData {
 }
 
 class DraggingState {
-  final String id;
+  final String reorderFlexId;
 
   /// The member of widget.children currently being dragged.
   Widget? _draggingWidget;
@@ -72,7 +72,7 @@ class DraggingState {
   /// The additional margin to place around a computed drop area.
   static const double _dropAreaMargin = 0.0;
 
-  DraggingState(this.id);
+  DraggingState(this.reorderFlexId);
 
   Size get dropAreaSize {
     if (feedbackSize == null) {
@@ -132,7 +132,7 @@ class DraggingState {
   }
 
   void updateNextIndex(int index) {
-    Log.trace('updateNextIndex: $index');
+    Log.debug('$reorderFlexId updateNextIndex: $index');
     nextIndex = index;
   }
 

frontend/app_flowy/packages/appflowy_board/lib/src/widgets/reorder_flex/drag_target.dart

@@ -222,10 +222,10 @@ class DragTargetAnimation {
         value: 0, vsync: vsync, duration: reorderAnimationDuration);
 
     insertController = AnimationController(
-        value: 0.0, vsync: vsync, duration: const Duration(milliseconds: 100));
+        value: 0.0, vsync: vsync, duration: const Duration(milliseconds: 200));
 
     deleteController = AnimationController(
-        value: 0.0, vsync: vsync, duration: const Duration(milliseconds: 10));
+        value: 0.0, vsync: vsync, duration: const Duration(milliseconds: 1));
   }
 
   void startDragging() {
@@ -276,6 +276,31 @@ class IgnorePointerWidget extends StatelessWidget {
   }
 }
 
+class AbsorbPointerWidget extends StatelessWidget {
+  final Widget? child;
+  final bool useIntrinsicSize;
+  const AbsorbPointerWidget({
+    required this.child,
+    this.useIntrinsicSize = false,
+    Key? key,
+  }) : super(key: key);
+
+  @override
+  Widget build(BuildContext context) {
+    final sizedChild = useIntrinsicSize
+        ? child
+        : SizedBox(width: 0.0, height: 0.0, child: child);
+
+    final opacity = useIntrinsicSize ? 0.3 : 0.0;
+    return AbsorbPointer(
+      child: Opacity(
+        opacity: opacity,
+        child: sizedChild,
+      ),
+    );
+  }
+}
+
 class PhantomWidget extends StatelessWidget {
   final Widget? child;
   final double opacity;
@@ -371,6 +396,7 @@ class _DragTargeMovePlaceholderState extends State<DragTargeMovePlaceholder> {
 }
 
 abstract class FakeDragTargetEventTrigger {
+  void fakeOnDragStart(void Function(int?) callback);
   void fakeOnDragEnded(VoidCallback callback);
 }
 
@@ -421,6 +447,10 @@ class _FakeDragTargetState<T extends DragTargetData>
     /// Start insert animation
     widget.insertAnimationController.forward(from: 0.0);
 
+    // widget.eventTrigger.fakeOnDragStart((insertIndex) {
+    //   Log.trace("[$FakeDragTarget] on drag $insertIndex");
+    // });
+
     widget.eventTrigger.fakeOnDragEnded(() {
       WidgetsBinding.instance.addPostFrameCallback((_) {
         widget.onDragEnded(widget.eventData.dragTargetData as T);
@@ -436,7 +466,7 @@ class _FakeDragTargetState<T extends DragTargetData>
       return SizeTransitionWithIntrinsicSize(
         sizeFactor: widget.deleteAnimationController,
         axis: Axis.vertical,
-        child: IgnorePointerWidget(
+        child: AbsorbPointerWidget(
           child: widget.child,
         ),
       );
@@ -444,7 +474,7 @@ class _FakeDragTargetState<T extends DragTargetData>
       return SizeTransitionWithIntrinsicSize(
         sizeFactor: widget.insertAnimationController,
         axis: Axis.vertical,
-        child: IgnorePointerWidget(
+        child: AbsorbPointerWidget(
           useIntrinsicSize: true,
           child: widget.child,
         ),

frontend/app_flowy/packages/appflowy_board/lib/src/widgets/reorder_flex/drag_target_interceptor.dart

@@ -1,3 +1,5 @@
+import 'dart:async';
+
 import 'package:flutter/material.dart';
 
 import '../../utils/log.dart';
@@ -8,6 +10,8 @@ import 'reorder_flex.dart';
 /// [DragTargetInterceptor] is used to intercept the [DragTarget]'s
 /// [onWillAccept], [OnAccept], and [onLeave] event.
 abstract class DragTargetInterceptor {
+  String get reorderFlexId;
+
   /// Returns [yes] to receive the [DragTarget]'s event.
   bool canHandler(FlexDragTargetData dragTargetData);
 
@@ -37,7 +41,7 @@ abstract class OverlapDragTargetDelegate {
     int dragTargetIndex,
   );
 
-  bool canMoveTo(String dragTargetId);
+  int canMoveTo(String dragTargetId);
 }
 
 /// [OverlappingDragTargetInterceptor] is used to receive the overlapping
@@ -47,9 +51,12 @@ abstract class OverlapDragTargetDelegate {
 /// Receive the [DragTarget] event if the [acceptedReorderFlexId] contains
 /// the passed in dragTarget' reorderFlexId.
 class OverlappingDragTargetInterceptor extends DragTargetInterceptor {
+  @override
   final String reorderFlexId;
   final List<String> acceptedReorderFlexId;
   final OverlapDragTargetDelegate delegate;
+  final List<ColumnKey> columnKeys = [];
+  Timer? _delayOperation;
 
   OverlappingDragTargetInterceptor({
     required this.delegate,
@@ -72,15 +79,38 @@ class OverlappingDragTargetInterceptor extends DragTargetInterceptor {
     if (dragTargetId == dragTargetData.reorderFlexId) {
       delegate.cancel();
     } else {
-      if (delegate.canMoveTo(dragTargetId)) {
-        delegate.moveTo(dragTargetId, dragTargetData, 0);
-      }
+      /// The priority of the column interactions is high than the cross column.
+      /// Workaround: delay 100 milliseconds to lower the cross column event priority.
+      _delayOperation?.cancel();
+      _delayOperation = Timer(const Duration(milliseconds: 100), () {
+        final index = delegate.canMoveTo(dragTargetId);
+        if (index != -1) {
+          Log.trace(
+              '[$OverlappingDragTargetInterceptor] move to $dragTargetId at $index');
+          delegate.moveTo(dragTargetId, dragTargetData, index);
+
+          // final columnIndex = columnKeys
+          //     .indexWhere((element) => element.columnId == dragTargetId);
+          // if (columnIndex != -1) {
+          //   final state = columnKeys[columnIndex].key.currentState;
+          //   if (state is ReorderFlexState) {
+          //     state.handleOnWillAccept(context, index);
+          //   }
+          // }
+        }
+      });
     }
 
     return true;
   }
 }
 
+class ColumnKey {
+  String columnId;
+  GlobalKey key;
+  ColumnKey({required this.columnId, required this.key});
+}
+
 abstract class CrossReorderFlexDragTargetDelegate {
   /// * [reorderFlexId] is the id that the [ReorderFlex] passed in.
   bool acceptNewDragTargetData(
@@ -96,6 +126,7 @@ abstract class CrossReorderFlexDragTargetDelegate {
 }
 
 class CrossReorderFlexDragTargetInterceptor extends DragTargetInterceptor {
+  @override
   final String reorderFlexId;
   final List<String> acceptedReorderFlexIds;
   final CrossReorderFlexDragTargetDelegate delegate;
@@ -119,8 +150,12 @@ class CrossReorderFlexDragTargetInterceptor extends DragTargetInterceptor {
       /// If the columnId equal to the dragTargetData's columnId,
       /// it means the dragTarget is dragging on the top of its own list.
       /// Otherwise, it means the dargTarget was moved to another list.
+      Log.trace(
+          "[$CrossReorderFlexDragTargetInterceptor] $reorderFlexId accept ${dragTargetData.reorderFlexId} ${reorderFlexId != dragTargetData.reorderFlexId}");
       return reorderFlexId != dragTargetData.reorderFlexId;
     } else {
+      Log.trace(
+          "[$CrossReorderFlexDragTargetInterceptor] not accept ${dragTargetData.reorderFlexId}");
       return false;
     }
   }
@@ -151,6 +186,9 @@ class CrossReorderFlexDragTargetInterceptor extends DragTargetInterceptor {
       dragTargetIndex,
     );
 
+    Log.debug(
+        '[$CrossReorderFlexDragTargetInterceptor] dargTargetIndex: $dragTargetIndex, reorderFlexId: $reorderFlexId');
+
     if (isNewDragTarget == false) {
       delegate.updateDragTargetData(reorderFlexId, dragTargetIndex);
       reorderFlexState.handleOnWillAccept(context, dragTargetIndex);

frontend/app_flowy/packages/appflowy_board/lib/src/widgets/reorder_flex/reorder_flex.dart

@@ -36,10 +36,10 @@ class ReorderFlexConfig {
   final double draggingWidgetOpacity = 0.3;
 
   // How long an animation to reorder an element
-  final Duration reorderAnimationDuration = const Duration(milliseconds: 250);
+  final Duration reorderAnimationDuration = const Duration(milliseconds: 300);
 
   // How long an animation to scroll to an off-screen element
-  final Duration scrollAnimationDuration = const Duration(milliseconds: 250);
+  final Duration scrollAnimationDuration = const Duration(milliseconds: 300);
 
   final bool useMoveAnimation;
 
@@ -214,7 +214,7 @@ class ReorderFlexState extends State<ReorderFlex>
       }
 
       Log.trace(
-          'Rebuild: Column:[${dragState.id}] ${dragState.toString()}, childIndex: $childIndex shiftedIndex: $shiftedIndex');
+          'Rebuild: Column:[${dragState.reorderFlexId}] ${dragState.toString()}, childIndex: $childIndex shiftedIndex: $shiftedIndex');
       final currentIndex = dragState.currentIndex;
       final dragPhantomIndex = dragState.phantomIndex;
 
@@ -330,6 +330,8 @@ class ReorderFlexState extends State<ReorderFlex>
         widget.onDragStarted?.call(draggingIndex);
       },
       onDragEnded: (dragTargetData) {
+        if (!mounted) return;
+
         Log.debug(
             "[DragTarget]: Column:[${widget.dataSource.identifier}] end dragging");
         _notifier.updateDragTargetIndex(-1);
@@ -346,21 +348,21 @@ class ReorderFlexState extends State<ReorderFlex>
         });
       },
       onWillAccept: (FlexDragTargetData dragTargetData) {
+        // Do not receive any events if the Insert item is animating.
         if (_animation.deleteController.isAnimating) {
           return false;
         }
 
         assert(widget.dataSource.items.length > dragTargetIndex);
-        if (_interceptDragTarget(
-          dragTargetData,
-          (interceptor) => interceptor.onWillAccept(
+        if (_interceptDragTarget(dragTargetData, (interceptor) {
+          interceptor.onWillAccept(
             context: builderContext,
             reorderFlexState: this,
             dragTargetData: dragTargetData,
             dragTargetId: reorderFlexItem.id,
             dragTargetIndex: dragTargetIndex,
-          ),
-        )) {
+          );
+        })) {
           return true;
         } else {
           return handleOnWillAccept(builderContext, dragTargetIndex);
@@ -435,7 +437,7 @@ class ReorderFlexState extends State<ReorderFlex>
     /// The [willAccept] will be true if the dargTarget is the widget that gets
     /// dragged and it is dragged on top of the other dragTargets.
     ///
-    Log.debug(
+    Log.trace(
         '[$ReorderDragTarget] ${widget.dataSource.identifier} on will accept, dragIndex:$dragIndex, dragTargetIndex:$dragTargetIndex, count: ${widget.dataSource.items.length}');
 
     bool willAccept =
@@ -524,7 +526,7 @@ class ReorderFlexState extends State<ReorderFlex>
     // screen, then it is already on-screen.
     final double margin = widget.direction == Axis.horizontal
         ? dragState.dropAreaSize.width
-        : dragState.dropAreaSize.height;
+        : dragState.dropAreaSize.height / 2.0;
     if (_scrollController.hasClients) {
       final double scrollOffset = _scrollController.offset;
       final double topOffset = max(

frontend/app_flowy/packages/appflowy_board/lib/src/widgets/reorder_phantom/phantom_controller.dart

@@ -59,12 +59,13 @@ class BoardPhantomController extends OverlapDragTargetDelegate
   }
 
   void columnStartDragging(String columnId) {
-    columnsState.setColumnIsDragging(columnId, false);
+    columnsState.setColumnIsDragging(columnId, true);
   }
 
   /// Remove the phantom in the column when the column is end dragging.
   void columnEndDragging(String columnId) {
-    columnsState.setColumnIsDragging(columnId, true);
+    columnsState.setColumnIsDragging(columnId, false);
+
     if (phantomRecord == null) return;
 
     final fromColumnId = phantomRecord!.fromColumnId;
@@ -73,19 +74,18 @@ class BoardPhantomController extends OverlapDragTargetDelegate
       columnsState.notifyDidRemovePhantom(toColumnId);
     }
 
-    if (columnsState.isDragging(fromColumnId) == false) {
-      return;
-    }
-
-    delegate.swapColumnItem(
-      fromColumnId,
-      phantomRecord!.fromColumnIndex,
-      toColumnId,
-      phantomRecord!.toColumnIndex,
-    );
+    if (phantomRecord!.toColumnId == columnId) {
+      delegate.swapColumnItem(
+        fromColumnId,
+        phantomRecord!.fromColumnIndex,
+        toColumnId,
+        phantomRecord!.toColumnIndex,
+      );
 
-    Log.debug("[$BoardPhantomController] did move ${phantomRecord.toString()}");
-    phantomRecord = null;
+      Log.debug(
+          "[$BoardPhantomController] did move ${phantomRecord.toString()}");
+      phantomRecord = null;
+    }
   }
 
   /// Remove the phantom in the column if it contains phantom
@@ -113,7 +113,7 @@ class BoardPhantomController extends OverlapDragTargetDelegate
       PhantomColumnItem(phantomContext),
     );
 
-    columnsState.notifyDidInsertPhantom(toColumnId);
+    columnsState.notifyDidInsertPhantom(toColumnId, phantomIndex);
   }
 
   /// Reset or initial the [PhantomRecord]
@@ -128,8 +128,9 @@ class BoardPhantomController extends OverlapDragTargetDelegate
     FlexDragTargetData dragTargetData,
     int dragTargetIndex,
   ) {
-    // Log.debug('[$BoardPhantomController] move Column:[${dragTargetData.reorderFlexId}]:${dragTargetData.draggingIndex} '
-    //     'to Column:[$columnId]:$index');
+    // Log.debug(
+    //     '[$BoardPhantomController] move Column:[${dragTargetData.reorderFlexId}]:${dragTargetData.draggingIndex} '
+    //     'to Column:[$columnId]:$dragTargetIndex');
 
     phantomRecord = PhantomRecord(
       toColumnId: columnId,
@@ -202,8 +203,17 @@ class BoardPhantomController extends OverlapDragTargetDelegate
   }
 
   @override
-  bool canMoveTo(String dragTargetId) {
-    return delegate.controller(dragTargetId)?.columnData.items.isEmpty ?? false;
+  int canMoveTo(String dragTargetId) {
+    if (columnsState.isDragging(dragTargetId)) {
+      return -1;
+    }
+
+    final controller = delegate.controller(dragTargetId);
+    if (controller != null) {
+      return controller.columnData.items.length;
+    } else {
+      return 0;
+    }
   }
 }
 
@@ -294,7 +304,7 @@ class PassthroughPhantomContext extends FakeDragTargetEventTrigger
   AFColumnItem get itemData => dragTargetData.reorderFlexItem as AFColumnItem;
 
   @override
-  VoidCallback? onInserted;
+  void Function(int?)? onInserted;
 
   @override
   VoidCallback? onDragEnded;
@@ -308,6 +318,11 @@ class PassthroughPhantomContext extends FakeDragTargetEventTrigger
   void fakeOnDragEnded(VoidCallback callback) {
     onDragEnded = callback;
   }
+
+  @override
+  void fakeOnDragStart(void Function(int? index) callback) {
+    onInserted = callback;
+  }
 }
 
 class PassthroughPhantomWidget extends PhantomWidget {

frontend/app_flowy/packages/appflowy_board/lib/src/widgets/reorder_phantom/phantom_state.dart

@@ -14,7 +14,7 @@ class ColumnPhantomStateController {
 
   void addColumnListener(String columnId, PassthroughPhantomListener listener) {
     _stateWithId(columnId).notifier.addListener(
-          onInserted: (c) => listener.onInserted?.call(),
+          onInserted: (index) => listener.onInserted?.call(index),
           onDeleted: () => listener.onDragEnded?.call(),
         );
   }
@@ -24,8 +24,8 @@ class ColumnPhantomStateController {
     _states.remove(columnId);
   }
 
-  void notifyDidInsertPhantom(String columnId) {
-    _stateWithId(columnId).notifier.insert();
+  void notifyDidInsertPhantom(String columnId, int index) {
+    _stateWithId(columnId).notifier.insert(index);
   }
 
   void notifyDidRemovePhantom(String columnId) {
@@ -48,7 +48,7 @@ class ColumnState {
 }
 
 abstract class PassthroughPhantomListener {
-  VoidCallback? get onInserted;
+  void Function(int?)? get onInserted;
   VoidCallback? get onDragEnded;
 }
 
@@ -57,8 +57,8 @@ class PassthroughPhantomNotifier {
 
   final removeNotifier = PhantomDeleteNotifier();
 
-  void insert() {
-    insertNotifier.insert();
+  void insert(int index) {
+    insertNotifier.insert(index);
   }
 
   void remove() {
@@ -66,12 +66,12 @@ class PassthroughPhantomNotifier {
   }
 
   void addListener({
-    void Function(PassthroughPhantomContext? insertedPhantom)? onInserted,
+    void Function(int? insertedIndex)? onInserted,
     void Function()? onDeleted,
   }) {
     if (onInserted != null) {
       insertNotifier.addListener(() {
-        onInserted(insertNotifier.insertedPhantom);
+        onInserted(insertNotifier.insertedIndex);
       });
     }
 
@@ -89,9 +89,11 @@ class PassthroughPhantomNotifier {
 }
 
 class PhantomInsertNotifier extends ChangeNotifier {
+  int insertedIndex = -1;
   PassthroughPhantomContext? insertedPhantom;
 
-  void insert() {
+  void insert(int index) {
+    insertedIndex = index;
     notifyListeners();
   }
 }

frontend/app_flowy/packages/appflowy_board/pubspec.yaml

@@ -1,6 +1,6 @@
 name: appflowy_board
 description: AppFlowy board implementation.
-version: 0.0.4
+version: 0.0.5
 homepage: https://github.com/AppFlowy-IO/AppFlowy
 repository: https://github.com/AppFlowy-IO/AppFlowy/tree/main/frontend/app_flowy/packages/appflowy_board