拡大・縮小・スクロールで試行錯誤 – 開発日記(18)

import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'logic_collection.dart';
import 'dart:math';
import 'dart:ui';
import 'dart:convert'; //JSON形式のデータを扱う
import 'package:path/path.dart' as path_dart; //asが無いとcontextを上書きされてしまう
import 'package:file_selector/file_selector.dart';

class MyCustomScrollBehavior extends MaterialScrollBehavior {
  @override
  Set<PointerDeviceKind> get dragDevices => {
    PointerDeviceKind.touch, // 通常のタッチ入力デバイス
    PointerDeviceKind.mouse, // これを追加！
  };
}

void main() => runApp(const ProviderScope(child: MyApp()));

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      scrollBehavior: MyCustomScrollBehavior(),
      home: const Scaffold(
        body: SafeArea(child:
          WholeApp(),
        ),
      ),
    );
  }
}

class WholeApp extends StatefulWidget {
  const WholeApp({Key? key}) : super(key: key);

  @override
  State<WholeApp> createState() => _WholeAppState();
}

class _WholeAppState extends State<WholeApp> {
  GlobalKey<CanvasZoneState> canvasZoneKey = GlobalKey();
  GlobalKey<ToolbarZoneState> toolbarZoneKey = GlobalKey();
  late ToolbarZone toolbarZone;
  late CanvasZone canvasZone;
  double x = 0.0;
  double y = 0.0;

  @override
  void initState() {
    canvasZone = CanvasZone(key: canvasZoneKey);
    toolbarZone = ToolbarZone(key: toolbarZoneKey);
    super.initState();
  }

  void _updateMouseLocation(PointerEvent details) {
    setState(() {
      toolbarZoneKey.currentState!.mouseX = details.position.dx;
      toolbarZoneKey.currentState!.mouseY = details.position.dy;
    });
  }

  @override
  Widget build(BuildContext context) {
    return WholeAppInheritedWidget(
      wholeAppState: this,
      child: MouseRegion(
        // onHover: _updateMouseLocation, //座標を表示する
        child: Column(
          children: [
            toolbarZone,
            const Divider(),
            canvasZone,
          ]
        ),
      ),
    );
  }
}

class WholeAppInheritedWidget extends InheritedWidget {
  final _WholeAppState wholeAppState;
  const WholeAppInheritedWidget({required this.wholeAppState, required Widget child, super.key}) : super(child: child);

  @override
  bool updateShouldNotify(WholeAppInheritedWidget oldWidget) => true;

  static _WholeAppState of(BuildContext context) {
    return context.dependOnInheritedWidgetOfExactType<WholeAppInheritedWidget>()!.wholeAppState;
  }
}

class ToolbarZone extends ConsumerStatefulWidget {
  @override
  final GlobalKey<ToolbarZoneState> key;

  const ToolbarZone({required this.key}) : super(key: key);

  @override
  ToolbarZoneState createState() => ToolbarZoneState();
}

class ToolbarZoneState extends ConsumerState<ToolbarZone> {
  double mouseX = -1;
  double mouseY = -1;

  @override
  void initState() {
    super.initState();
  }

  void addNewLane() => WholeAppInheritedWidget.of(context).canvasZoneKey.currentState!.addNewLane();
  void removeLane() => WholeAppInheritedWidget.of(context).canvasZoneKey.currentState?.removeLane();
  void test() => WholeAppInheritedWidget.of(context).canvasZoneKey.currentState?.test();

  void scaleUp() {
/*
    if (WholeAppInheritedWidget.of(context).canvasZoneKey.currentState == null) return;
    TransformationController controller = WholeAppInheritedWidget.of(context).canvasZoneKey.currentState!._transformationController;
    controller.value = Matrix4.identity()..scale(controller.value.getMaxScaleOnAxis() * 1.2);
    ref.watch(currentScale.notifier).state = controller.value.getMaxScaleOnAxis();
*/
    ref.watch(currentScale.notifier).state = ref.read(currentScale)*1.2;
  }

  void scaleDown() {
/*
    if (canvasZoneKey.currentState == null) return;
    TransformationController controller = canvasZoneKey.currentState!._transformationController;
    controller.value = Matrix4.identity()..scale(controller.value.getMaxScaleOnAxis() * 0.85);
    ref.watch(currentScale.notifier).state = controller.value.getMaxScaleOnAxis();
    print("${MediaQuery.of(context).size.height * (1 / ref.watch(currentScale))}");
*/
    ref.watch(currentScale.notifier).state = ref.read(currentScale)*0.85;
  }

  void scaleReset() {
    if (WholeAppInheritedWidget.of(context).canvasZoneKey.currentState == null) return;
    TransformationController controller = WholeAppInheritedWidget.of(context).canvasZoneKey.currentState!._transformationController;
    controller.value = Matrix4.identity();
    ref.watch(currentScale.notifier).state = 1.0;
  }

  Future<void> loadDataWithDialog() async {
    const XTypeGroup typeGroup = XTypeGroup(
      label: 'json',
      extensions: ['json'],
    );
    final XFile? file = await openFile(acceptedTypeGroups: [typeGroup]);
    if (file != null) {
      await loadData(fileName: file.path, state: WholeAppInheritedWidget.of(context).canvasZoneKey.currentState);
      //レーンの高さを取得
      ref.watch(lanesBodyCanvasHeight.notifier).state = WholeAppInheritedWidget.of(context).canvasZoneKey.currentState!.getMaxLanesHight();
      //スクロールポジションを戻す
      WholeAppInheritedWidget.of(context).canvasZoneKey.currentState!._scrollController.jumpTo(0);
      WholeAppInheritedWidget.of(context).canvasZoneKey.currentState!.setState(() {}); //画面の再描画
    }
  }

  Future<void> saveAs() async {
    String? path = await getSavePath(
      acceptedTypeGroups: [
        const XTypeGroup(label: 'json', extensions: ['json'])
      ],
      suggestedName: "",
    );
    if (path != null) {
      if (path_dart.extension(path) == '') {
        path = '$path.json';
      }
      saveData(fileName: path, state: WholeAppInheritedWidget.of(context).canvasZoneKey.currentState);
    }
  }

  String getCurrentMousePositionStr() {
    String result = "";
    if (mouseX != -1) {
      result = "x:${mouseX.toInt().toString().padLeft(5,'0')}, y:${mouseY.toInt().toString().padLeft(5,'0')} ";
    }
    return result;
  }

  @override
  Widget build(BuildContext context) {
    return ToolbarZoneInheritedWidget(
      toolbarZoneState: this,
      child: Column(children: [
        Align(
          alignment: Alignment.center,
          child: SingleChildScrollView(
            scrollDirection: Axis.horizontal,
            child: Container( //ツールバー
              margin: const EdgeInsets.only(top: 10),
              child: Row(
                mainAxisAlignment: MainAxisAlignment.center,
                children: [
                  ElevatedButton(
                    onPressed: addNewLane,
                    child: const Text("レーン追加"),
                  ),
                  const SizedBox(width: 10),
                  ElevatedButton(
                    onPressed: removeLane,
                    child: const Text("削除"),
                  ),
                  const SizedBox(width: 30),
                  ElevatedButton(
                    onPressed: scaleUp,
                    child: const Text("拡大"),
                  ),
                  const SizedBox(width: 10),
                  ElevatedButton(
                    onPressed: scaleDown,
                    child: const Text("縮小"),
                  ),
                  const SizedBox(width: 10),
                  ElevatedButton(
                    onPressed: scaleReset,
                    child: const Text("リセット"),
                  ),
                  const SizedBox(width: 30),
                  ElevatedButton(
                    onPressed: saveAs,
                    child: const Text("名前を付けて保存"),
                  ),
                  const SizedBox(width: 10),
                  ElevatedButton(
                    onPressed: loadDataWithDialog,
                    child: const Text("ファイルを読込"),
                  ),
                  const SizedBox(width: 30),
                  ElevatedButton(
                    onPressed: test,
                    child: const Text("テスト"),
                  ),
                  const SizedBox(width: 30),
                  Text(getCurrentMousePositionStr()),
                ],
              ),
            ),
          ),
        ),
      ]),
    );
  }
}


class ToolbarZoneInheritedWidget extends InheritedWidget {
  final ToolbarZoneState toolbarZoneState;
  const ToolbarZoneInheritedWidget({required this.toolbarZoneState, required Widget child, super.key}) : super(child: child);

  @override
  bool updateShouldNotify(ToolbarZoneInheritedWidget oldWidget) => true;

  static ToolbarZoneState of(BuildContext context) {
    return context.dependOnInheritedWidgetOfExactType<ToolbarZoneInheritedWidget>()!.toolbarZoneState;
  }
}

class CanvasZone extends ConsumerStatefulWidget {
  @override
  final GlobalKey<CanvasZoneState> key;

  const CanvasZone({required this.key}) : super(key: key);

  @override
  CanvasZoneState createState() => CanvasZoneState();
}

class CanvasZoneState extends ConsumerState<CanvasZone> {
  double widthA = double.infinity;
  List<LaneBody> lanes = [];
  List<LaneHeader> laneHeaders = [];
  final TransformationController _transformationController = TransformationController();
  final GlobalKey _interactiveViewerKey = GlobalKey();
  double globalTop = 0.0;
  final _scrollController = ScrollController();
//  double _scale = 1.0;
  double laneWidth = 100;

  @override
  void initState() {
    super.initState();
    addNewLane();
    loadDataAtStartUp();

    getMaxLanesHight();

    WidgetsBinding.instance.addPostFrameCallback((_) {
      //CanvasのTop座標を取得(スクロール制御用)
      globalTop = (widget.key.currentContext?.findRenderObject() as RenderBox).localToGlobal(Offset.zero).dy;

      //レーンの幅を決定
      ref.watch(eachLaneWidth.notifier).state = MediaQuery.of(context).size.width * 0.4;
      laneWidth = MediaQuery.of(context).size.width * 0.4;

      lanes[0].ideas[0].key.currentState?._textFocusNode.requestFocus();
    });
  }

  void test() {
    setState(() {});
  }

  double getMaxLanesHight() {
    int maxIdeaLength = 1;
    for (var lane in lanes) {
      if (lane.ideas.length > maxIdeaLength ) {
        maxIdeaLength = lane.ideas.length;
      }
    }
    return maxIdeaLength * ref.read(eachIdeaHeight);
  }

  Future<void> loadDataAtStartUp() async {
    await loadData(state: this);

    //レーンの高さを取得
    ref.watch(lanesBodyCanvasHeight.notifier).state = getMaxLanesHight();
  }

  Future<void> addNewLane() async {
    setState(() {
      var index = lanes.length;
      var newLane = LaneBody(index: index, ideas: [Idea(index: 0)]);
      lanes.add(newLane);
      newLane.ideas[0].parentLane = newLane;
      var newLaneHeader = LaneHeader(index: index, relatedLane: newLane);
      laneHeaders.add(newLaneHeader);
    });
  }

  Future<void> addNewLaneAndFocusTitle(int targetLaneIndex) async {
    if (targetLaneIndex == lanes.length) {
      await addNewLane();
    }
    // ウィジェットが構築されるのを待つ
    WidgetsBinding.instance.addPostFrameCallback((_) {
      laneHeaders[targetLaneIndex].key.currentState?._titleFocusNode.requestFocus();
    });
  }

  Future<void> addNewLaneAndFocusIt() async {
    await addNewLane();
    WidgetsBinding.instance.addPostFrameCallback((_) {
      lanes[lanes.length - 1].ideas[0].key.currentState?._textFocusNode.requestFocus();
    });
  }

  void removeLane() {
    setState(() {
      if (lanes.length > 1) {
        //関係するリレーションを削除
        for (var idea in lanes[lanes.length - 1].ideas) {
          lanes[lanes.length - 1].key.currentState?.removeFromRelation(idea);
        }
        lanes.removeLast();
        laneHeaders.removeLast();
      }
    });
  }

  void focusNextLane(int targetLaneIndex, int targetIdeaIndex) {
    if(targetLaneIndex < 0 || targetIdeaIndex < 0) return;
    if( checkAndFillIdeas(targetLaneIndex, targetIdeaIndex) ) {
      WidgetsBinding.instance.addPostFrameCallback((_) {
        lanes[targetLaneIndex].ideas[targetIdeaIndex].key.currentState?._textFocusNode.requestFocus(); //FillIdeasされた場合は遅延でのフォーカスが必要
      });
    } else {
      lanes[targetLaneIndex].ideas[targetIdeaIndex].key.currentState?._textFocusNode.requestFocus(); //FillIdeasされなかった場合は即座にフォーカス
    }
  }

  bool checkAndFillIdeas(int targetLaneIndex, int targetIdeaIndex) {
    bool added = false; //アイディアかレーンが追加されたかどうかで、呼び出し元が処理を分けられるようにする
    if (targetLaneIndex < 0 || targetIdeaIndex < 0) return added;
    if (targetLaneIndex == lanes.length) {
      addNewLane();
      added = true;
    }
    if (targetLaneIndex < lanes.length) {
      for (int i = lanes[targetLaneIndex].ideas.length - 1; i < targetIdeaIndex; i++) {
        if (lanes[targetLaneIndex].key.currentState == null) {
          setState(() {
            //addNewIdeaが使えない状態なので、やむなく自力実装
            lanes[targetLaneIndex].ideas.add(Idea(index: i + 1));
            lanes[targetLaneIndex].ideas[lanes[targetLaneIndex].ideas.length - 1].parentLane = lanes[targetLaneIndex];
            for (int j = 0; j < lanes[targetLaneIndex].ideas.length; j++) {
              lanes[targetLaneIndex].ideas[j].index = j;
            }
          });
        } else {
          lanes[targetLaneIndex].key.currentState?.addNewIdea(i);
        }
        added = true;
      }
    }
    return added;
  }

  @override
  Widget build(BuildContext context) {
    return CanvasZoneInheritedWidget(
      canvasZoneState: this,
      child: Expanded( //これが無いと画面描画のOverFlowを起こす
        child: Stack(
          children:[
            Positioned(
              top: 0,
              left:0,
              child: Transform.scale(
                alignment: Alignment.topLeft,
                scale: ref.watch(currentScale),
                child: Container(
                  //Canvasのサイズ
                  width: max( ref.watch(eachLaneWidth) * lanes.length, MediaQuery.of(context).size.width * (1 / ref.watch(currentScale)) ),
                  height:  ( globalTop + ref.watch(headerHeight) + ref.watch(lanesBodyCanvasHeight) ) * (1 / ref.watch(currentScale)),
                  color: Colors.transparent, // カラーを指定しないと上のGestureDetectorの範囲がchildの範囲に収まってしまう
                  child: Stack(
                    children: [
                      Positioned( // タイトル行
                        top:0,
                        left:0,
                        child: SizedBox(
                          width: max( ref.watch(eachLaneWidth) * lanes.length, MediaQuery.of(context).size.width * (1 / ref.watch(currentScale)) ),
                          height: 50,
                          child: Stack(
                            children: [
                              Positioned(
                                top:  0,
                                left: ref.watch(canvasScrollDeltaX),
                                width: ref.watch(eachLaneWidth) * lanes.length,
                                height: ref.watch(headerHeight),
                                child: Row(
                                  children: laneHeaders,
                                ),
                              ),
                            ],
                          ),
                        ),
                      ),
                      Positioned( // ボディ部
                        top: ref.watch(headerHeight),
                        left:0,
                        child: Container(
                          width: MediaQuery.of(context).size.width  * (1 / ref.watch(currentScale)),
                          height: ( globalTop + ref.watch(headerHeight) + ref.watch(lanesBodyCanvasHeight) ) * (1 / ref.watch(currentScale)),
                          child: Stack(
                            children: [
                              Positioned(
                                top: ref.watch(canvasScrollDeltaY),
                                left:0,
                                child: Scrollbar(
                                  controller: _scrollController,
                                  thumbVisibility: true,
                                  trackVisibility: true,
                                  child: SingleChildScrollView(
                                    primary: false, // フォーカスを Scrollbarへ
                                    controller: _scrollController,
                                    child: SizedBox(
                                      width:  max( ref.watch(eachLaneWidth) * lanes.length, MediaQuery.of(context).size.width * (1 / ref.watch(currentScale)) ),
                                      height:  ( globalTop + ref.watch(headerHeight) + ref.watch(lanesBodyCanvasHeight) ) * (1 / ref.watch(currentScale)),
                                      child: GestureDetector(
                                        onPanUpdate: (details) { //タイトル行を一緒に動かす
                                          setState(() {

                                            //横方向のスクロール範囲：全レーンの幅から、キャンバス領域の描画サイズを引いたもの + バッファ
                                            double limitX = ref.watch(eachLaneWidth) * lanes.length - MediaQuery.of(context).size.width + (ref.watch(eachLaneWidth)*1/3);
                                            ref.watch(canvasScrollDeltaX.notifier).state += details.delta.dx;
                                            ref.watch(canvasScrollDeltaX.notifier).state = ref.watch(canvasScrollDeltaX).clamp( -limitX, 0);

                                            //縦方向のスクロール範囲：lanesBodyの高さから、キャンバス領域の描画サイズを引いたもの + バッファ
                                            double limitY = ref.watch(lanesBodyCanvasHeight) - ( MediaQuery.of(context).size.height - globalTop - ref.watch(headerHeight)) + (ref.watch(eachIdeaHeight)*2/3);
                                            ref.watch(canvasScrollDeltaY.notifier).state += details.delta.dy;
                                            ref.watch(canvasScrollDeltaY.notifier).state = ref.watch(canvasScrollDeltaY).clamp( -limitY, 0);

                                            print("ref.watch(canvasScrollDeltaY):${ref.read(canvasScrollDeltaY)} limitY:${limitY}");
                                            //_scrollController.jumpTo(targetY.clamp(0, yRange)); //スクロールのバウンス用
                                          });
                                        },
                                        onTap: () async {
                                          if (ref.watch(relationHoverFlg)) {
                                            await relationSelectDialog(context,this);
                                            setState(() {});
                                          }
                                        },
                                        child:Stack(
                                          children:
                                            buildIdeasAndRelations(this),
                                        ),
                                      ),
                                    ),
                                  ),
                                ),
                              ),
                            ]
                          ),
                        ),
                      ),
                    ]
                  ),
                ),
              ),
            ),
          ]
        ),
      ),
    );
  }
}

class CanvasZoneInheritedWidget extends InheritedWidget {
  final CanvasZoneState canvasZoneState;
  const CanvasZoneInheritedWidget({required this.canvasZoneState, required Widget child, super.key}) : super(child: child);

  @override
  bool updateShouldNotify(CanvasZoneInheritedWidget oldWidget) => true;

  static CanvasZoneState of(BuildContext context) {
    return context.dependOnInheritedWidgetOfExactType<CanvasZoneInheritedWidget>()!.canvasZoneState;
  }
}

class IdeasRelation {
  Idea fromIdea;
  Idea toIdea;
  RelationShape fromShape=RelationShape.dot;
  RelationShape toShape=RelationShape.dot;
  String note = '';

  IdeasRelation({required this.fromIdea, required this.toIdea});
}

class LaneHeader extends ConsumerStatefulWidget {
  @override
  final GlobalKey<LaneHeaderState> key = GlobalKey<LaneHeaderState>();
  int index;
  String title;
  LaneBody relatedLane;
  final double indentWidth = 40; //インデントの下げ幅

  LaneHeader({
    required this.index,
    required this.relatedLane,
    this.title = '',
  }) : super(key: ValueKey(GlobalKey<LaneHeaderState>().toString()));

  @override
  ConsumerState<LaneHeader> createState() => LaneHeaderState();
}

class LaneHeaderState extends ConsumerState<LaneHeader> {
  final TextEditingController titleController = TextEditingController();
  final FocusNode _titleFocusNode = FocusNode();

  @override
  void initState() {
    super.initState();
    titleController.text = widget.title;
  }

  @override
  Widget build(BuildContext context) {
    return LaneHeaderInheritedWidget(
      laneHeaderState: this,
      child: SizedBox(
        height: 50,
        width: ref.watch(eachLaneWidth),
        child: Focus(
          onKey: (FocusNode node, RawKeyEvent event) {
            if (event.runtimeType == RawKeyDownEvent) {
              if (event.logicalKey == LogicalKeyboardKey.arrowDown) { //カーソルキー ↓
                widget.relatedLane.ideas[0].key.currentState?._textFocusNode.requestFocus();
              } else if (event.logicalKey == LogicalKeyboardKey.arrowRight && //カーソルキー →
                  titleController.selection.baseOffset == titleController.text.length) {
                CanvasZoneInheritedWidget.of(context).addNewLaneAndFocusTitle(widget.index + 1);
              } else if (event.logicalKey == LogicalKeyboardKey.arrowLeft && //カーソルキー ←
                  titleController.selection.baseOffset == 0) {
                if (widget.index > 0) {
                  CanvasZoneInheritedWidget.of(context).laneHeaders[widget.index - 1].key.currentState?._titleFocusNode.requestFocus();
                }
              }
            }
            return KeyEventResult.ignored;
          },
          child: Container( //タイトル
            color: Colors.blue[50],
            padding: const EdgeInsets.symmetric(horizontal: indentWidth),
            child: TextField(
              autofocus: true,
              controller: titleController,
              focusNode: _titleFocusNode,
              decoration: InputDecoration(
                border: InputBorder.none,
                disabledBorder: const OutlineInputBorder(
                  borderSide: BorderSide(color: Colors.blue, width: 2.0),
                ),
                fillColor: Colors.blue[50],
                filled: true,
              ),
              style: TextStyle(fontSize: 18.0, fontWeight: FontWeight.bold, color: Colors.blue[900]),
              keyboardType: TextInputType.text,
              textInputAction: TextInputAction.done,
              onSubmitted: (value) {
                _titleFocusNode.unfocus();
              },
            ),
          )),
      ),
    );
  }
}

class LaneHeaderInheritedWidget extends InheritedWidget {
  final LaneHeaderState laneHeaderState;

  const LaneHeaderInheritedWidget({required this.laneHeaderState, required Widget child, super.key}) : super(child: child);

  @override
  bool updateShouldNotify(LaneHeaderInheritedWidget oldWidget) => true;

  static LaneHeaderState of(BuildContext context) {
    return context.dependOnInheritedWidgetOfExactType<LaneHeaderInheritedWidget>()!.laneHeaderState;
  }
}

class LaneBody extends ConsumerStatefulWidget {
  @override
  final GlobalKey<LaneBodyState> key = GlobalKey<LaneBodyState>();
  int index;
  String title;
  List<Idea> ideas;

  LaneBody({
    required this.index,
    required this.ideas,
    this.title = '',
  }) : super(key: ValueKey(GlobalKey<LaneBodyState>().toString()));

  @override
  ConsumerState<LaneBody> createState() => LaneBodyState();
}

class LaneBodyState extends ConsumerState<LaneBody> {
  List<Idea> get ideas => widget.ideas;
  final TextEditingController titleController = TextEditingController();

  void addNewIdea(int currentIndex) {
    setState(() {
      int currentIndentLevel = ideas[currentIndex].indentLevel;
      ideas.insert(
        currentIndex + 1,
        Idea(
          index: currentIndex + 1,
          parentLane: widget,
          textFieldHeight: 48.0,
          indentLevel: currentIndentLevel,
        ),
      );
      rebuildItemIndexes(currentIndex + 2);
    });
  }

  void addNewIdeaWithFocus(int currentIndex) {
    addNewIdea(currentIndex);
    WidgetsBinding.instance.addPostFrameCallback((_) {
      ideas[currentIndex + 1].key.currentState?._textFocusNode.requestFocus();
    });
  }

  void rebuildItemIndexes(int startIndex) {
    for (int i = startIndex; i < ideas.length; i++) {
      ideas[i].index = i;
    }
    ref.watch(lanesBodyCanvasHeight.notifier).state = CanvasZoneInheritedWidget.of(context).getMaxLanesHight();
  }

  void moveIdea(int currentIdeaIndex, int direction) {
    if (currentIdeaIndex + direction >= 0 && currentIdeaIndex + direction < ideas.length) {
      setState(() {
        Idea temp = ideas[currentIdeaIndex];
        ideas[currentIdeaIndex] = ideas[currentIdeaIndex + direction];
        ideas[currentIdeaIndex + direction] = temp;
        ideas[currentIdeaIndex].key.currentState?.updateIndex(currentIdeaIndex);
        ideas[currentIdeaIndex + direction].key.currentState?.updateIndex(currentIdeaIndex + direction);
      });
    }
  }

  void moveAndInsertIdeaToAnotherLane(int currentIdeaIndex, int direction) {
    if(widget.index + direction < 0) {
      return;
    }
    var canvas = CanvasZoneInheritedWidget.of(context);
    canvas.checkAndFillIdeas(widget.index + direction, max(currentIdeaIndex - 1,0) );
    canvas.lanes[widget.index + direction].ideas.insert(currentIdeaIndex, ideas[currentIdeaIndex]);
    canvas.lanes[widget.index + direction].ideas[currentIdeaIndex].parentLane = CanvasZoneInheritedWidget.of(context).lanes[widget.index + direction];

    //rebuildItemIndexes(0)を行いたいが、stateが出来ていないため手動実装
    for (int i = 0; i < canvas.lanes[widget.index + direction].ideas.length; i++) {
      canvas.lanes[widget.index + direction].ideas[i].index = i;
    }

    canvas.lanes[widget.index].ideas.removeAt(currentIdeaIndex);
    rebuildItemIndexes(0);

    ref.watch(lanesBodyCanvasHeight.notifier).state = CanvasZoneInheritedWidget.of(context).getMaxLanesHight();

    canvas.setState(() {}); //画面の再描画
  }

  void removeFromRelation(Idea targetIdea) {
    //削除対象のリレーションを探す
    List<IdeasRelation> removeTargetList = [];
    if (ref.read(ideasRelationList).isNotEmpty) {
      for (var relationSet in ref.read(ideasRelationList)) {
        if (relationSet.fromIdea == targetIdea || relationSet.toIdea == targetIdea) {
          removeTargetList.add(relationSet);
        }
      }
    }
    //実際に削除する
    if (removeTargetList.isNotEmpty) {
      for (var relationSet in removeTargetList) {
        removeRelation(ref.watch(ideasRelationList.notifier).state, relationSet);
      }
    }
  }

  void removeIdea(int currentIndex) {
    if (ideas.length > 1) {
      removeFromRelation(ideas[currentIndex]);
      ideas.removeAt(currentIndex);
      for (int i = currentIndex; i < ideas.length; i++) {
        ideas[i].index = i;
      }
      ideas[max(0, currentIndex - 1)].key.currentState?._textFocusNode.requestFocus();
      CanvasZoneInheritedWidget.of(context).setState(() {}); //画面の再描画
    }
  }

  void focusNextIdea(int currentIndex, int direction) {
    if (currentIndex == 0 && direction <= 0) { //タイトルにフォーカスを移す
      CanvasZoneInheritedWidget.of(context).laneHeaders[widget.index].key.currentState!._titleFocusNode.requestFocus();
    } else if (currentIndex + direction >= 0 && currentIndex + direction < ideas.length) {
      ideas[currentIndex + direction].key.currentState?._textFocusNode.requestFocus();
    }
  }

  void redrawAffectedIdeas(int startIndex, int endIndex) {
    if (startIndex < 0 || endIndex >= ideas.length) return;
    setState(() {
      for (int i = startIndex; i <= endIndex; i++) {
        //再描画を促す
        //ideas[i].key.currentState?.indentLevel = widget.key.currentState?.indentLevel ?? indentLevel;
      }
    });
  }

  @override
  void initState() {
    super.initState();
    titleController.text = widget.title;
  }

  @override
  Widget build(BuildContext context) {
    return LaneBodyInheritedWidget(
      laneState: this,
      child: SizedBox(
        width: double.infinity,
        height: (ref.watch(eachIdeaHeight) * ideas.length).toDouble(),
        child: Column(
          children: ideas
        ),
      ),
    );
  }
}

class LaneBodyInheritedWidget extends InheritedWidget {
  final LaneBodyState laneState;

  const LaneBodyInheritedWidget({required this.laneState, required Widget child, super.key}) : super(child: child);

  @override
  bool updateShouldNotify(LaneBodyInheritedWidget oldWidget) => true;

  static LaneBodyState of(BuildContext context) {
    return context.dependOnInheritedWidgetOfExactType<LaneBodyInheritedWidget>()!.laneState;
  }
}

class Idea extends ConsumerStatefulWidget {
  @override
  final GlobalKey<IdeaState> key = GlobalKey<IdeaState>();
  int index;
  int indentLevel;
  final double textFieldHeight; //テキスト欄の高さ
  String content;
  LaneBody? parentLane;
  List<Idea> relatedIdeasTo = [];
  List<Idea> relatedIdeasFrom = [];

  Idea({
    required this.index,
    this.parentLane,
    this.textFieldHeight = 48.0, //デフォルトは48
    this.indentLevel = 0,
    this.content = '',
  }) : super(key: ValueKey(GlobalKey<IdeaState>().toString()));

  @override
  IdeaState createState() => IdeaState();
}

class IdeaState extends ConsumerState<Idea> with AutomaticKeepAliveClientMixin<Idea> {
  final TextEditingController textController = TextEditingController();
  final FocusNode _textFocusNode = FocusNode();

  void updateIndex(int newIndex) {
    setState(() {
      widget.index = newIndex;
    });
  }

  // インデントの線を描画する
  void _indentLinePaint(Canvas canvas, Size size) {
    indentLinePaint(canvas, size, context, widget.index, widget.indentLevel, widget.textFieldHeight, indentWidth);
  }

  String toJson() {
    Map<String, dynamic> data = {
      'index': widget.index,
      'indentLevel': widget.indentLevel,
      'text': textController.text,
    };
    return json.encode(data);
  }

  void startRelationMode() {
    ref.watch(relatedIdeaSelectMode.notifier).state = true;
    ref.watch(originIdeaForSelectMode.notifier).state = widget;
    ScaffoldMessenger.of(context).showSnackBar(
        const SnackBar( content: Text( '接続先を選んでEnterキーを押してください'),)
    );
  }

  void endRelationMode() {
    StateController<bool> mode = ref.watch(relatedIdeaSelectMode.notifier);
    Idea? origin = ref.watch(originIdeaForSelectMode.notifier).state;
    ScaffoldMessenger.of(context).hideCurrentSnackBar();
    if (origin != null) {
      bool cancelFlg = false;
      List<IdeasRelation> ideasRelations = ref.watch(ideasRelationList.notifier).state;

      //自分自身に接続しようとしていないかチェック
      if(origin == widget) {
        cancelFlg = true;
        ScaffoldMessenger.of(context).showSnackBar(
          const SnackBar( content: Text('自分自身には接続できません'), ),
        );
      } else {
        //既に同じリレーションが無いかチェック
        for (var element in ideasRelations) {
          if ( (element.fromIdea == origin && element.toIdea == widget) || (element.fromIdea == widget && element.toIdea == origin) ){
            cancelFlg = true;
            ScaffoldMessenger.of(context).showSnackBar(
              const SnackBar( content: Text('既に接続されています'), ),
            );
            break;
          }
        }
      }
      if(cancelFlg == false) {
        widget.relatedIdeasFrom.add(origin);
        origin.relatedIdeasTo.add(widget);
        ref.watch(ideasRelationList.notifier).state.add(IdeasRelation(fromIdea: origin, toIdea: widget));
        CanvasZoneInheritedWidget.of(context).setState(() {}); //Relationの線を描画
      }
      origin = null;
    }
    mode.state = false;
  }

  late final Map<Type, Action<Intent>> _actionMap;

  @override
  void initState() {
    super.initState();
    textController.text = widget.content;
    _actionMap = <Type, Action<Intent>>{
      ActivateIntent: CallbackAction<Intent>(
        onInvoke: (Intent intent) => startRelationMode(),
      ),
    };
  }

  @override
  bool get wantKeepAlive => true; //これが無いと画面外から出たときに中身も消えてしまう

  final Map<ShortcutActivator, Intent> _shortcutMap =
  const <ShortcutActivator, Intent>{
    SingleActivator(LogicalKeyboardKey.keyX, control: true): ActivateIntent(),
  };

  //TextFieldでEnterを押した場合のキーの処理について
  //・webだと、submit→key webの順で処理される
  //・windowsだと、key → submitの順で処理される
  @override
  Widget build(BuildContext context) {
    super.build(context);
    return Focus(
      onKey: (FocusNode node, RawKeyEvent event) {

        //print("event.runtimeType:${event.runtimeType.toString()} Normal${event.logicalKey.keyLabel} , Web${ (event.data is RawKeyEventDataWeb) ? (event.data as RawKeyEventDataWeb).code : ''}");

        if (event.runtimeType == RawKeyDownEvent) {
          if ((event.logicalKey.keyLabel == 'Enter') ||
              ( (event.data is RawKeyEventDataWeb)&&(event.data as RawKeyEventDataWeb).code == 'Enter') ) { //Enterの場合のみ特殊処理が必要
            if (event.isControlPressed) {
              startRelationMode();
            }
            else {
              if (ref.read(relatedIdeaSelectMode.notifier).state == true) { //relatedの指定モード
                endRelationMode();
                _textFocusNode.requestFocus();
              } else {
                _textFocusNode.unfocus();
                LaneBodyInheritedWidget.of(context).addNewIdeaWithFocus(widget.index);
              }
            }
            return KeyEventResult.handled;
          } else if (event.logicalKey == LogicalKeyboardKey.capsLock) {
            // CapsLockキーを無視する条件を追加
            return KeyEventResult.ignored;
          } else if (event.isControlPressed) { // コントロールキー押下
            bool needRepaint = false;
            if (event.logicalKey == LogicalKeyboardKey.arrowUp) { // Ctrl + ↑
              LaneBodyInheritedWidget.of(context).moveIdea(widget.index, -1);
              needRepaint = true;
            } else if (event.logicalKey == LogicalKeyboardKey.arrowDown) { // Ctrl + ↓
              if (widget.index + 1 == LaneBodyInheritedWidget.of(context).ideas.length) {
                LaneBodyInheritedWidget.of(context).addNewIdea(widget.index);
                LaneBodyInheritedWidget.of(context).moveIdea(widget.index, 1);
                LaneBodyInheritedWidget.of(context).rebuildItemIndexes(0); //再度構築しなおさないと、インデックスがおかしくなる
              } else {
                LaneBodyInheritedWidget.of(context).moveIdea(widget.index, 1);
              }
              needRepaint = true;
            }
            if (event.logicalKey == LogicalKeyboardKey.arrowRight) { // Ctrl + →
              LaneBodyInheritedWidget.of(context).moveAndInsertIdeaToAnotherLane(widget.index, 1);
              needRepaint = false;
            } else if (event.logicalKey == LogicalKeyboardKey.arrowLeft) { // Ctrl + ←
              LaneBodyInheritedWidget.of(context).moveAndInsertIdeaToAnotherLane(widget.index, -1);
              needRepaint = false;
            } else if (event.logicalKey == LogicalKeyboardKey.tab) {  // Ctrl + TAB
              startRelationMode();
            }
            if (needRepaint) {
              findAndRepaintAffectedIdeas(context, widget.index, widget.indentLevel, widget.index,
                  widget.index + 1 /*Ctrlキーの場合、１つ下からチェックが必要*/);
            }
          } else if (event.logicalKey == LogicalKeyboardKey.arrowUp) { //カーソルキー ↑
            LaneBodyInheritedWidget.of(context).focusNextIdea(widget.index, -1);
            return KeyEventResult.handled; //余計なフォーカスの移動を防ぐ
          } else if (event.logicalKey == LogicalKeyboardKey.arrowDown) { //カーソルキー ↓
            if (widget.index == LaneBodyInheritedWidget.of(context).ideas.length - 1) {
              LaneBodyInheritedWidget.of(context).addNewIdeaWithFocus(widget.index);
            } else {
              LaneBodyInheritedWidget.of(context).focusNextIdea(widget.index, 1);
            }
            return KeyEventResult.handled; //余計なフォーカスの移動を防ぐ
          } else if (event.logicalKey == LogicalKeyboardKey.arrowRight && //カーソルキー →
              textController.selection.baseOffset == textController.text.length) {
            int laneIndex =
                CanvasZoneInheritedWidget.of(context).lanes.indexOf(LaneBodyInheritedWidget.of(context).widget);
            CanvasZoneInheritedWidget.of(context).focusNextLane(laneIndex + 1, widget.index);
          } else if (event.logicalKey == LogicalKeyboardKey.arrowLeft && textController.selection.baseOffset == 0) {
            int laneIndex =
                CanvasZoneInheritedWidget.of(context).lanes.indexOf(LaneBodyInheritedWidget.of(context).widget);
            CanvasZoneInheritedWidget.of(context).focusNextLane(laneIndex - 1, widget.index);
          } else if (event.logicalKey == LogicalKeyboardKey.tab) { //TABキー
            if (event.isShiftPressed) { //SHIFT + TABキー
              setState(() {
                widget.indentLevel = max(0, widget.indentLevel - 1);
              });
            } else {
              setState(() {
                widget.indentLevel += 1;
              });
            }
            findAndRepaintAffectedIdeas(context, widget.index, widget.indentLevel, widget.index, widget.index);
            return KeyEventResult.handled; //デフォルトのタブの挙動を無効化して、フォーカスの移動を防ぐ
          } else if ((event.logicalKey == LogicalKeyboardKey.delete || //DELキー & BSキー
                  event.logicalKey == LogicalKeyboardKey.backspace) &&
              textController.text.isEmpty) {
            LaneBodyInheritedWidget.of(context).removeIdea(widget.index);
          } else if (event.logicalKey == LogicalKeyboardKey.f1) { // F1キー
            startRelationMode();
          }
        }
        return KeyEventResult.ignored;
      },
      child: RawKeyboardListener(
        focusNode: FocusNode(),
        child: Container(
          margin: const EdgeInsets.symmetric(horizontal: ideaHorizontalMargin, vertical: ideaVerticalMargin),
          child: Row(
            crossAxisAlignment: CrossAxisAlignment.center,
            children: [
              const SizedBox(width: ideaLeftSpace, child: DecoratedBox(decoration: BoxDecoration(color: Colors.red))),
              Expanded(
                flex: 4,
                child: Row(children: [
                  CustomPaint(
                    painter: _CustomPainter(_indentLinePaint),
                    child: Container(width: indentWidth * widget.indentLevel),
                  ),
                  Expanded(
                    child: SizedBox(
                      height: widget.textFieldHeight,
                      child: FocusableActionDetector(
                        actions: _actionMap,
                        shortcuts: _shortcutMap,
                        child: TextFormField(
                          controller: textController,
                          focusNode: _textFocusNode,
                          maxLines: 1,
                          decoration: const InputDecoration(
                            border: OutlineInputBorder(),
                          ),
                          keyboardType: TextInputType.multiline,
                          textInputAction: TextInputAction.done,
                          onFieldSubmitted: (value) {
                            _textFocusNode.requestFocus(); //Enterはこれが無いとKeyEventが発生しない（おそらくフォーカスが無くなるから。少なくともWebでは必須）
                          },
                        ),
                      ),
                    ),
                  ),
                ]),
              ),
            ],
          ),
        ),
      )
    );
  }
}

class _CustomPainter extends CustomPainter {
  final void Function(Canvas, Size) _paint;
  _CustomPainter(this._paint);

  @override
  void paint(Canvas canvas, Size size) {
    _paint(canvas, size);
  }

  @override
  bool shouldRepaint(covariant CustomPainter oldDelegate) => false;
}

import 'package:flutter/material.dart';
import 'main.dart';
import 'dart:convert'; //JSON形式のデータを扱う
import 'package:path_provider/path_provider.dart';
import 'dart:io';
import 'dart:math';
import 'package:flutter_riverpod/flutter_riverpod.dart';

//リレーションの情報
StateProvider<bool> relatedIdeaSelectMode = StateProvider((ref) => false);
StateProvider<Idea?> originIdeaForSelectMode = StateProvider((ref) => null);
StateProvider<List<IdeasRelation>> ideasRelationList = StateProvider((ref) => []);
StateProvider<IdeasRelation?> selectedRelation = StateProvider((ref) => null);
//リレーションの見た目
enum RelationShape{dot,arrow}
StateProvider<Color> relationColor = StateProvider((ref) => Colors.blue);
StateProvider<bool> relationHoverFlg = StateProvider((ref) => false);
const bool relationDebugPaint = false;

//スケール
StateProvider<double> currentScale = StateProvider((ref) => 1);

//各種ウィジェットのサイズと表現
StateProvider<double> headerHeight = StateProvider((ref) => 50);
StateProvider<double> eachLaneWidth = StateProvider((ref) => 500);
StateProvider<double> eachIdeaHeight = StateProvider((ref) => 64); //48+8+8
StateProvider<double> lanesBodyCanvasHeight = StateProvider((ref) => 500);
StateProvider<double> relationDotSize = StateProvider((ref) => 6);
StateProvider<double> relationArrowSize = StateProvider((ref) => 10);

const double ideaLeftSpace = 26;
const double ideaHorizontalMargin = 16;
const double ideaVerticalMargin = 8;
const double indentWidth = 40;

const Color relationColorTransparent = Colors.transparent;//デバッグ時に変えられるよう定義

//タイトル行のスクロール用
StateProvider<double> canvasScrollDeltaX = StateProvider((ref) => 0);
StateProvider<double> canvasScrollDeltaY = StateProvider((ref) => 0);


//2点間の距離を求める関数
double getDistance(double x, double y, double x2, double y2) {
  double distance = sqrt((x2 - x) * (x2 - x) + (y2 - y) * (y2 - y));
  return distance;
}
//2点間の角度を求める関数
double getRadian(double x, double y, double x2, double y2) {
  double radian = atan2(y2 - y,x2 - x);
  return radian;
}

//右向き矢印
class TrianglePainterR extends CustomPainter{
  Color color;
  TrianglePainterR(this.color);

  @override
  void paint(Canvas canvas, Size size) {
    var paint = Paint()..color = color;

    // 三角（塗りつぶし）
    var path = Path();
    path.moveTo(0, 0);
    path.lineTo(size.width, size.height / 2);
    path.lineTo(0,              size.height);
    path.close();
    canvas.drawPath(path, paint);
  }

  @override
  bool shouldRepaint(CustomPainter oldDelegate) => false;
}

//左向き矢印
class TrianglePainterL extends CustomPainter{
  Color color;
  TrianglePainterL(this.color);

  @override
  void paint(Canvas canvas, Size size) {
    var paint = Paint()..color = color;

    // 三角（塗りつぶし）
    var path = Path();
    path.moveTo(size.width, 0);
    path.lineTo(0, size.height / 2);
    path.lineTo(size.width, size.height);
    path.close();
    canvas.drawPath(path, paint);
  }

  @override
  bool shouldRepaint(CustomPainter oldDelegate) => false;
}

void removeRelation(List<IdeasRelation> ideasRelationList, IdeasRelation targetRelation) {
  targetRelation.fromIdea.relatedIdeasTo.remove(targetRelation.toIdea);
  targetRelation.toIdea.relatedIdeasFrom.remove(targetRelation.fromIdea);
  ideasRelationList.remove(targetRelation);
}

Future<dynamic> relationSelectDialog(BuildContext context, CanvasZoneState state){
  var isSelected = <bool>[false, false, false, false];
  GlobalKey toggleButtonsKey = GlobalKey();
  GlobalKey dialogKey = GlobalKey();
  final TextEditingController textController = TextEditingController();
  IdeasRelation? targetRelation = state.ref.read(selectedRelation);

  if(targetRelation != null) {
    if(targetRelation.fromShape == RelationShape.dot && targetRelation.toShape == RelationShape.dot) {
      isSelected[0] = true;
    } else if(targetRelation.fromShape == RelationShape.dot && targetRelation.toShape == RelationShape.arrow) {
      // originとrelationの左右の位置によって、反映対象を変える
      if (targetRelation.fromIdea.parentLane!.index <= targetRelation.toIdea.parentLane!.index) {
        isSelected[1] = true;
      } else {
        isSelected[2] = true;
      }
    } else if(targetRelation.fromShape == RelationShape.arrow && targetRelation.toShape == RelationShape.dot) {
      if (targetRelation.fromIdea.parentLane!.index <= targetRelation.toIdea.parentLane!.index) {
        isSelected[2] = true;
      } else {
        isSelected[1] = true;
      }
    } else if(targetRelation.fromShape == RelationShape.arrow && targetRelation.toShape == RelationShape.arrow) {
      isSelected[3] = true;
    }
    textController.text = targetRelation.note;
  }

  return showDialog(
    context: context,
    builder: (context) {
      return StatefulBuilder(
        builder: (context, setState) {
          return SimpleDialog(
            key: dialogKey,
            contentPadding: const EdgeInsets.all(26),
            children: [
              Align( // 閉じるボタン
                alignment: Alignment.centerRight,
                child: Tooltip(
                  message: MaterialLocalizations
                      .of(context)
                      .closeButtonTooltip,
                  child: GestureDetector(
                    onTap: () => Navigator.pop(context),
                    child: const Icon(Icons.close, size: 30),
                  ),
                ),
              ),
              const Text('矢印の種類'),
              Container(height: 10,),
              ToggleButtons(
                key: toggleButtonsKey,
                direction: Axis.vertical,
                borderColor: Colors.white,
                selectedColor: Colors.lightBlueAccent,
                selectedBorderColor: Colors.white,
                isSelected: isSelected,
                onPressed: (index) {
                  // The button that is tapped is set to true, and the others to false.
                  setState(() {
                    for (int i = 0; i < isSelected.length; i++) {
                      isSelected[i] = i == index;
                    }
                  });
                },
                children: [
                  SizedBox(
                    height: 40,
                    width: 180,
                    child: Stack(
                      children: drawRelationLineAt(state, 30,20,150,20, RelationShape.dot, RelationShape.dot, null),
                    ),
                  ),
                  SizedBox(
                    height: 40,
                    width: 180,
                    child: Stack(
                      children: drawRelationLineAt(state, 30,20,150,20, RelationShape.dot, RelationShape.arrow, null),
                    ),
                  ),
                  SizedBox(
                    height: 40,
                    width: 180,
                    child: Stack(
                      children: drawRelationLineAt(state, 30,20,150,20, RelationShape.arrow, RelationShape.dot, null),
                    ),
                  ),
                  SizedBox(
                    height: 40,
                    width: 180,
                    child: Stack(
                      children: drawRelationLineAt(state, 30,20,150,20, RelationShape.arrow, RelationShape.arrow, null),
                    ),
                  ),
                ],
              ),
              Container(height: 10),
              const Text('線の説明'),
              TextField(
                controller: textController,
                decoration: InputDecoration(
                  border: OutlineInputBorder(borderRadius: BorderRadius.circular(10)),
                ),
              ),
              Container(height: 15),
              const Divider(),
              Container(height: 15),
              Align(alignment: Alignment.center, child:
              SizedBox(
                width: 120,
                height: 40,
                child:
                  ElevatedButton(
                    onPressed: () { // 決定ボタン押下時
                      if (isSelected[0]) {
                        targetRelation!.fromShape = RelationShape.dot;
                        targetRelation.toShape = RelationShape.dot;
                      } else if (isSelected[1]) {
                        // originとrelationの左右の位置によって、反映対象を変える
                        if (targetRelation!.fromIdea.parentLane!.index <= targetRelation.toIdea.parentLane!.index) {
                          targetRelation.fromShape = RelationShape.dot;
                          targetRelation.toShape = RelationShape.arrow;
                        } else {
                          targetRelation.fromShape = RelationShape.arrow;
                          targetRelation.toShape = RelationShape.dot;
                        }
                      } else if (isSelected[2]) {
                        // originとrelationの左右の位置によって、反映対象を変える
                        if (targetRelation!.fromIdea.parentLane!.index <= targetRelation.toIdea.parentLane!.index) {
                          targetRelation.fromShape = RelationShape.arrow;
                          targetRelation.toShape = RelationShape.dot;
                        } else {
                          targetRelation.fromShape = RelationShape.dot;
                          targetRelation.toShape = RelationShape.arrow;
                        }
                      } else if (isSelected[3]) {
                        targetRelation!.fromShape = RelationShape.arrow;
                        targetRelation.toShape = RelationShape.arrow;
                      }
                      targetRelation!.note = textController.text;
                      Navigator.pop(context);
                    },
                    child: const Text('決定')
                  ),
                ),
              ),
              Container(height: 15),
              Align(alignment: Alignment.bottomCenter, child:
                Consumer(
                  builder: (context, ref, child) {
                    return TextButton(
                      style: ButtonStyle(
                        foregroundColor: MaterialStateProperty.all<Color>(Colors.redAccent),
                      ),
                      onPressed: () async {
                        // 確認ダイアログを表示
                        var result = await showDialog<bool>(
                          context: context,
                          barrierDismissible: false,
                          builder: (BuildContext context) {
                            return AlertDialog(
                              title: const Text('確認'),
                              content: const Text('線を削除してよろしいですか？'),
                              actions: <Widget>[
                                TextButton(
                                  child: const Text('Cancel'),
                                  onPressed: () => Navigator.of(context).pop(false),
                                ),
                                TextButton(
                                  child: const Text('OK'),
                                  onPressed: () => Navigator.of(context).pop(true),
                                ),
                              ],
                            );
                          },
                        );
                        if (result == true) {
                          //リレーション削除の実行
                          removeRelation( ref.watch(ideasRelationList.notifier).state , targetRelation! );
                          Navigator.pop(context);
                        }
                      },
                      child: const Text('線の削除')
                    );
                  }
                ),
              ),
            ],
          );
        },
      );
    },
  );
}

Size _getTextSize(String text, TextStyle style) {
  final TextPainter textPainter = TextPainter(
      text: TextSpan(text: text, style: style), maxLines: 1, textDirection: TextDirection.ltr)
    ..layout(minWidth: 0, maxWidth: double.infinity);
  return textPainter.size;
}

// 指定した座標を元にリレーションの線と文字を描画
List <Widget> drawRelationLineAt(CanvasZoneState state, double startX, double startY, double endX, double endY, RelationShape startShape, RelationShape endShape, IdeasRelation? ideasRelation) {
  List <Widget> list = [];
  final double dotSize = state.ref.watch(relationDotSize);
  final double arrowSize = state.ref.watch(relationArrowSize);
  double rotateAdjustX = 0;
  double rotateAdjustY = 0;
  double rotateAdjustXForTransparent = 0;
  double rotateAdjustYForTransparent = 0;
  double scrollDeltaX = state.ref.watch(canvasScrollDeltaX);
  bool hoverFlg = false;
  double lineWidthDiv2 = 1;

  void focusEnter() {
    state.ref.watch(relationHoverFlg.notifier).state = true;
    state.ref.watch(selectedRelation.notifier).state = ideasRelation;
  }
  void focusExit() {
    state.ref.watch(relationHoverFlg.notifier).state = false;
    state.ref.watch(selectedRelation.notifier).state = null;
  }

  if(ideasRelation != null) {
    if ( state.ref.watch(relationHoverFlg) && state.ref.read(selectedRelation) == ideasRelation ) {
      hoverFlg = true;
    }
  }

  // 指定座標にドットを描画
  Widget makeDotAt(double dx, double dy) {
    return Positioned(
      top: dy - (dotSize / 2),
      left: dx - (dotSize / 2) + scrollDeltaX,
      width: dotSize,
      height: dotSize,
      child: MouseRegion(
        onEnter: (_) => focusEnter(),
        onExit: (_) => focusExit(),
        child: Container(
          decoration: BoxDecoration(
            color: hoverFlg ? Colors.lightBlueAccent : Colors.blue,
            shape: BoxShape.circle,
          ),
        ),
      ),
    );
  }

  /* ドットと三角の描画 */
  if(startShape == RelationShape.dot) {
    list.add( //ドットの描画 Origin
      makeDotAt( startX, startY )
    );
  } else {
    list.add( //三角の描画
      Positioned(
        top: startY - (arrowSize / 2),
        left: startX - (arrowSize / 2) + scrollDeltaX,
        child: Transform.rotate(
          angle: (startX == endX) /*レーンが同じ場合*/ ? 0 : getRadian(startX + scrollDeltaX, startY, endX + scrollDeltaX, endY),
          alignment: Alignment.center,
          child: MouseRegion(
            onEnter: (_) => focusEnter(),
            onExit: (_) => focusExit(),
            child: CustomPaint(
              painter: TrianglePainterL(hoverFlg ? Colors.lightBlueAccent : Colors.blue),
              child: SizedBox(
                width: arrowSize,
                height: arrowSize,
              ),
            ),
          ),
        ),
      ),
    );
  }
  if(endShape == RelationShape.dot) {
    list.add( //ドットの描画 Relation
      makeDotAt( endX, endY )
    );
  } else {
    list.add( //三角の描画
      Positioned(
        top: endY - (arrowSize / 2),
        left: endX - (arrowSize / 2) + scrollDeltaX,
        child: Transform.rotate(
          angle: (startX == endX) /*レーンが同じ場合*/ ? (180 * pi / 180) : getRadian(startX + scrollDeltaX, startY, endX + scrollDeltaX, endY),
          alignment: Alignment.center,
          child: MouseRegion(
            onEnter: (_) => focusEnter(),
            onExit: (_) => focusExit(),
            child: CustomPaint(
              painter: TrianglePainterR(hoverFlg ? Colors.lightBlueAccent : Colors.blue),
              child: SizedBox(
                width: arrowSize,
                height: arrowSize,
              ),
            ),
          ),
        ),
      ),
    );
  }

  double lineTop=0,lineLeft=0,lineHeight=0,lineWidth=0;
  /* 線の描画 */
  if (startX != endX) {
    /*レーンが違う場合*/
    if ( (endY - startY) > 30) { //右側の点が下側。回転すると、線の太さだけずれて見えてしまうので、それを調整する
      rotateAdjustX = 1;
      rotateAdjustY = 1;
      rotateAdjustXForTransparent = 2;
      rotateAdjustYForTransparent = 0;
    } else if ( (endY - startY) < -30) { //右側の点が上側。回転すると、線の太さだけずれて見えてしまうので、それを調整する
      rotateAdjustX = -1;
      rotateAdjustY = 0;
      rotateAdjustXForTransparent = -2;
      rotateAdjustYForTransparent = 0;
    }
    lineTop   = startY - lineWidthDiv2 + rotateAdjustY;
    lineLeft  = startX + lineWidthDiv2 + scrollDeltaX + rotateAdjustX;
    lineWidth = getDistance(startX + scrollDeltaX, startY, endX + scrollDeltaX, endY) - 2;
    lineHeight= 2;
    list.add( //線の描画
      Stack(
        children:[
          Positioned( //実際の線の描画
            top:  lineTop,
            left: lineLeft,
            child: Transform.rotate(
              angle: getRadian(startX + scrollDeltaX, startY, endX + scrollDeltaX, endY),
              alignment: Alignment.topLeft,
              origin: const Offset( -0.5, -0.5 ),
              child: Container(
                width: lineWidth,
                height: lineHeight,
                decoration: BoxDecoration(
                  color: hoverFlg ? Colors.lightBlueAccent : Colors.blue,
                ),
              ),
            ),
          ),
          Positioned( //当たり判定用の透明な線
            top:  startY - lineWidthDiv2 + rotateAdjustY + rotateAdjustYForTransparent - 3/*線の太さ分を調整*/,
            left: startX + lineWidthDiv2 + scrollDeltaX + rotateAdjustXForTransparent + rotateAdjustX - 1,
            child: Transform.rotate(
              angle: getRadian(startX + scrollDeltaX, startY, endX + scrollDeltaX, endY),
              alignment: Alignment.topLeft,
              //          origin: Offset( state.ref.watch(relationDotSize)/2 , state.ref.watch(relationDotSize)/2 ),
              child: MouseRegion(
                onEnter: (_) => focusEnter(),
                onExit: (_) => focusExit(),
                child: Container(
                  width: getDistance(startX + scrollDeltaX, startY, endX + scrollDeltaX, endY),
                  height: 8,
                  decoration: const BoxDecoration( color: relationColorTransparent ),
                ),
              ),
            ),
          ),
        ]
      ),
    );
  } else {
    /*レーンが同じ場合*/
    double horizontalMargin = ideaHorizontalMargin - 2;
    lineTop   = startY - lineWidthDiv2;
    lineLeft  = startX + scrollDeltaX + horizontalMargin;
    lineWidth = 2;
    lineHeight= endY- startY + (lineWidthDiv2*2) /*線の太さ分を調整*/;
    list.add( //線の描画
      Stack(
        children:[
          Positioned( //実際の線の描画（縦）
            top:  lineTop,
            left: lineLeft,
            child: Container(
              width: 2,
              height: lineHeight,
              decoration: BoxDecoration(
                color: hoverFlg ? Colors.lightBlueAccent : Colors.blue,
              ),
            ),
          ),
          Positioned( //実際の線の描画（横１）
            top:  startY - lineWidthDiv2,
            left: startX + lineWidthDiv2 + scrollDeltaX,
            child: Container(
              width: horizontalMargin,
              height: 2,
              decoration: BoxDecoration(
                color: hoverFlg ? Colors.lightBlueAccent : Colors.blue,
              ),
            ),
          ),
          Positioned( //実際の線の描画（横２）
            top:  endY - lineWidthDiv2,
            left: endX + lineWidthDiv2 + scrollDeltaX,
            child: Container(
              width: horizontalMargin,
              height: 2,
              decoration: BoxDecoration(
                color: hoverFlg ? Colors.lightBlueAccent : Colors.blue,
              ),
            ),
          ),
          Positioned( //当たり判定用の透明な線（縦）
            top:  startY - lineWidthDiv2 - 2 /*線の太さ分を調整*/,
            left: startX + scrollDeltaX + horizontalMargin - 2,
            child: MouseRegion(
              onEnter: (_) => focusEnter(),
              onExit:  (_) => focusExit(),
              child: Container(
                width: 2 + 4,
                height: endY - startY + (lineWidthDiv2*2) /*線の太さ分を調整*/ + 4,
                decoration: const BoxDecoration( color: relationColorTransparent ),
              ),
            ),
          ),
          Positioned( //当たり判定用の透明な線（横１）
            top:  startY - lineWidthDiv2 - 2 /*線の太さ分を調整*/,
            left: startX + lineWidthDiv2 + scrollDeltaX,
            child: MouseRegion(
              onEnter: (_) => focusEnter(),
              onExit:  (_) => focusExit(),
              child: Container(
                width: horizontalMargin,
                height: 2 + 4,
                decoration: const BoxDecoration( color: relationColorTransparent ),
              ),
            ),
          ),
          Positioned( //当たり判定用の透明な線（横２）
            top:  endY - lineWidthDiv2 - 2 /*線の太さ分を調整*/,
            left: endX + lineWidthDiv2 + scrollDeltaX,
            child: MouseRegion(
              onEnter: (_) => focusEnter(),
              onExit:  (_) => focusExit(),
              child: Container(
                width: horizontalMargin,
                height: 2 + 4,
                decoration: const BoxDecoration( color: relationColorTransparent ),
              ),
            ),
          ),
        ]
      ),
    );
  }

  String note = '';
  if(ideasRelation != null) {
    note = ideasRelation.note;
  }
  /* 文字の描画 */
  if ( note != '' ) {
    /* 線の描画 */
    if (startX != endX) {
      /*レーンが違う場合*/
      double radian = getRadian(startX + scrollDeltaX, startY, endX + scrollDeltaX, endY);

      // radianのイメージ
      // -90° = (-90* pi / 180) =-1.5707963267948966
      // -45° = (-45* pi / 180) =-0.7853981633974483
      //  0°  = ( 0 * pi / 180) = 0
      //  45° = (45 * pi / 180) = 0.7853981633974483
      //  90° = (90 * pi / 180) = 1.5707963267948966
      // 180° = pi              = 3.14

      // 手入力での調整結果
      // -90° left: - 18,   top:  - 0,
      // -75° left: - 15,   top:  - 8,
      // -45° left: - 12,   top: - 12,
      // -30° left: - 5,    top: - 15,
      //  0°  left: - 0,    top: - 18,
      //
      // Offset(13*radian,  -19 + (5*radian.abs())),
      // -90° left: -20.4,  top: - 19+7.8= -11.2
      // -45° left: -10.2,  top: - 19+3.9= -15.1
      //  0°  left:   0,    top: - 19,
      //  45° left:  10.2,  top: - 19+3.9= -15.1
      //  90° left:  20.4,  top: - 19+7.8= -11.2
      //
      //print("$radian (-45 * pi / 180):${(-45 * pi / 180)} (90 * pi / 180):${(90 * pi / 180)} (180 * pi / 180):${(180 * pi / 180)}");

      list.add( //文字の描画
        Stack(
          children: [
            Positioned( //文字の描画
              top: lineTop,
              left: lineLeft,
              width: lineWidth,
              child: Align(
                alignment: Alignment.center,
                child: Transform.translate(
                  offset: Offset(13 * radian, -19 + (4 * radian.abs())),
                  child: Transform.rotate(
                    angle: radian,
                    alignment: Alignment.topLeft,
                    origin: const Offset(-0.5, -0.5),
                    child: Container(
                      color: Colors.transparent,
                      alignment: Alignment.center,
                      child: Text(note, style: const TextStyle(color: Colors.blue),),
                    ),
                  ),
                ),
              ),
            ),
          ]
        ),
      );
    } else {
      /*レーンが同じ場合*/
      double radian = getRadian(lineLeft, lineTop, lineLeft, lineTop+lineHeight);
      Size textSize = _getTextSize(note, const TextStyle(color: Colors.blue));
      list.add( //文字の描画
        Stack(
          children: [
            Positioned( //文字の描画
              top: lineTop,
              left: lineLeft,
              child: Align(
                alignment: Alignment.center,
                child: Transform.translate(
                  offset: Offset(textSize.height + 4, (lineHeight/2) - (textSize.width/2) ),
                  child: Transform.rotate(
                    angle: radian,
                    alignment: Alignment.topLeft,
                    origin: const Offset(-0.5, -0.5),
                    child: Container(
                      color: Colors.transparent,
                      alignment: Alignment.center,
                      child: Text(note, style: const TextStyle(color: Colors.blue),),
                    ),
                  ),
                ),
              ),
            ),
          ]
        ),
      );
    }
  }
  //デバッグ用
  if(relationDebugPaint) {
    list.add(
      Positioned( //デバッグ用
        top: startY,
        left: startX + scrollDeltaX,
        width: 1,
        height: 1,
        child: Container(
          decoration: const BoxDecoration(
            color: Colors.red,
            shape: BoxShape.circle,
          ),
        ),
      ),
    );
    list.add(
      Positioned( //デバッグ用
        top: startY - lineWidthDiv2 + rotateAdjustY,
        left: startX + lineWidthDiv2 + scrollDeltaX,
        width: 1,
        height: 1,
        child: Container(
          decoration: const BoxDecoration(
            color: Colors.orange,
            shape: BoxShape.circle,
          ),
        ),
      ),
    );
  }

  return list;
}

// relationを元にリレーション描画ウィジェットを作成
List<Widget> buildRelationLineWidget(CanvasZoneState state, IdeasRelation relationSet) {
  Idea startIdea, endIdea;
  RelationShape startShape, endShape;
  double startX, startY, endY, endX;
  final double laneWidth = state.ref.watch(eachLaneWidth);
  final double ideaHeight = state.ref.watch(eachIdeaHeight);

  if (relationSet.fromIdea.parentLane!.index != relationSet.toIdea.parentLane!.index ) {
    // leftを必ずstartIdeaとしてしまう。左右逆のパターンもロジックを記述すると、回転の計算などが面倒になったため
    if (relationSet.fromIdea.parentLane!.index <= relationSet.toIdea.parentLane!.index) {
      startIdea = relationSet.fromIdea;
      startShape = relationSet.fromShape;
      endIdea = relationSet.toIdea;
      endShape = relationSet.toShape;
    } else {
      startIdea = relationSet.toIdea;
      startShape = relationSet.toShape;
      endIdea = relationSet.fromIdea;
      endShape = relationSet.fromShape;
    }

    // 描画位置から求めると、パン・スクロールしたときにどんどんずれていく
    // RenderBox originIdeaTextFieldBox = origin.textFieldKey.currentContext?.findRenderObject() as RenderBox;
    startY = (ideaHeight * startIdea.index) + (ideaHeight/2) - 0.5/*調整用。これが無いとずれて見える*/ ;
    startX = (startIdea.parentLane!.index + 1) * laneWidth - ideaHorizontalMargin - 0.5/*調整用。これが無いとずれて見える*/;
    endY = (ideaHeight * endIdea.index) + (ideaHeight/2) - 0.5/*調整用。これが無いとずれて見える*/;
    endX = (laneWidth * endIdea.parentLane!.index) + ideaHorizontalMargin + ideaLeftSpace + (indentWidth * endIdea.indentLevel) + 0.5/*調整用。これが無いとずれて見える*/;

    /* 見やすくするためのずらし調整（インデント） */
    if (startIdea.parentLane!.index < endIdea.parentLane!.index &&
        endIdea.indentLevel >= 1) { //Relatedが右側にあり、インデントされている場合
      endY += 3; //Related側のインデントの線と重なるのを避けるために少しずらす
    }

    /* 見やすくするためのずらし調整（他の矢印やドットとの重なり：右側） */
    if ( (endY - startY).abs() > 10) { // 線に角度が付いている場合
      bool avoidFlg = false;
      //対象のアイディアに、他にリレーションが付いているか探す
      if(endIdea.relatedIdeasFrom.length >= 2) {
        avoidFlg = true;
      }
      if (avoidFlg) {
        if (startY < endY - 10) { // 矢印が斜めの場合
          endY -= 6; //Related側の矢印と重なるのを避けるために少しずらす
        } else if (startY > endY) {
          endY += 6;
        }
      }
      /* 見やすくするためのずらし調整（他の矢印やドットとの重なり：右側） */
      avoidFlg = false;
      //対象のアイディアに、他にリレーションが付いているか探す
      if(startIdea.relatedIdeasTo.length >= 2) {
        avoidFlg = true;
      }
      if (avoidFlg) {
        if (startY < endY - 10) { // 矢印が斜めの場合
          startY += 6; //Related側の矢印と重なるのを避けるために少しずらす
        } else if (startY > endY) {
          startY -= 6;
        }
      }
    }
  } else{
    /* 同じレーン同士の場合 */
    // 計算を簡単にするため、上を必ずstartIdeaとしてしまう
    if (relationSet.fromIdea.index <= relationSet.toIdea.index) {
      startIdea = relationSet.fromIdea;
      startShape = relationSet.fromShape;
      endIdea = relationSet.toIdea;
      endShape = relationSet.toShape;
    } else {
      startIdea = relationSet.toIdea;
      startShape = relationSet.toShape;
      endIdea = relationSet.fromIdea;
      endShape = relationSet.fromShape;
    }

    startY = (ideaHeight * startIdea.index) + (ideaHeight/2) - 0.5/*調整用。これが無いとずれて見える*/ ;
    startX = (startIdea.parentLane!.index + 1) * laneWidth - ideaHorizontalMargin - 0.5/*調整用。これが無いとずれて見える*/;
    endY = (ideaHeight * endIdea.index) + (ideaHeight/2) - 0.5/*調整用。これが無いとずれて見える*/;
    endX = startX;

    /* 見やすくするためのずらし調整（他の矢印やドットとの重なり：右側） */
    bool avoidFlg = false;
    //対象のアイディアに、他にリレーションが付いているか探す
    if(startIdea.relatedIdeasTo.length >= 2) {
      avoidFlg = true;
    }
    if (avoidFlg) {
      if (startY < endY - 10) { // 矢印が斜めの場合
        startY += 6; //Related側の矢印と重なるのを避けるために少しずらす
      } else if (startY > endY) {
        startY -= 6;
      }
    }
  }

  if(relationDebugPaint) {
    List<Widget> result = drawRelationLineAt(state, startX,startY,endX,endY, startShape,endShape, relationSet) ;
    //座標に関するデバッグ用 originの表示
    result.add(
        Stack(children: [
          Positioned( //デバッグ用 originの表示
            top: startIdea == relationSet.fromIdea ? startY : endY,
            left: startIdea == relationSet.fromIdea ? startX + state.ref.watch(canvasScrollDeltaX) : endX + state.ref.watch(canvasScrollDeltaX),
            child: Container(
              width: 3,
              height: 3,
              decoration: const BoxDecoration(color: Colors.deepPurpleAccent,),
            ),
          ),
        ])
    );
    //デバッグ用 dotの中心線
    result.add(
        Stack(children: [
          Positioned( //デバッグ用
            top: endY,
            left: endX + state.ref.watch(canvasScrollDeltaX),
            child: Container(
              width: 500,
              height: 0.5,
              decoration: const BoxDecoration(color: Colors.red,),
            ),
          ),
        ])
    );
    return result;
  } else {
    return drawRelationLineAt(state, startX,startY,endX,endY, startShape,endShape, relationSet) ;
  }
}

List <Widget> buildIdeasAndRelations(CanvasZoneState state) {
  List <Widget> list = [];
  final double laneWidth = state.ref.watch(eachLaneWidth);

  /* Ideas */
  list.add(
    Positioned( // Ideasの描画
      top:  0,
      left: 0 + state.ref.watch(canvasScrollDeltaX),
      width: laneWidth * state.lanes.length,
      height: state.ref.watch(lanesBodyCanvasHeight),
      child: ListView.builder(
        scrollDirection: Axis.horizontal,
        itemCount: state.lanes.length,
        itemBuilder: (context, index) {
          return SizedBox( // Laneごとの箱
            width: laneWidth,
            child: state.lanes[index],
          );
        },
      ),
    ),
  );
  if (state.widget.key.currentState == null) return list;
  if (state.widget.key.currentState!.lanes.isEmpty) return list;
  if (state.widget.key.currentState!.lanes[0].ideas.isEmpty) return list;

  /* Relation */
  IdeasRelation? lazyBuildTarget;
  for (IdeasRelation relationSet in state.ref.watch(ideasRelationList)) {
    if ( state.ref.watch(relationHoverFlg) && state.ref.read(selectedRelation) == relationSet ) {
      //アクティブな線は、最後に描画することで手前に持ってくる（そうしないと他の線に隠れてしまう）
      lazyBuildTarget = relationSet;
    } else {
      list.addAll( buildRelationLineWidget(state, relationSet) );
    }
  }
  if(lazyBuildTarget != null) {
    list.addAll( buildRelationLineWidget(state, lazyBuildTarget) );
  }

/*
  //デバッグ用
  list.add(
    Stack(children: [
      Positioned( //デバッグ用
        top:  0,
        left: state.ref.watch(eachLaneWidth) - ideaHorizontalMargin - 50 + state.ref.watch(canvasScrollDeltaX),
        child: Container(
          width: 500,
          height: 1,
          decoration: BoxDecoration(color: Colors.red,),
        ),
      ),
      Positioned( //デバッグ用
        top:  (ideaHeight / 2),
        left: state.ref.watch(eachLaneWidth) - ideaHorizontalMargin - 50 + state.ref.watch(canvasScrollDeltaX),
        child: Container(
          width: 1000,
          height: 0.5,
          decoration: BoxDecoration(color: Colors.green,),
        ),
      ),
    ],
    ),
  );
*/

  return list;
}

void indentLinePaint(Canvas canvas,Size size,BuildContext context, int index, int indentLevel, double textFieldHeight, double indentWidth) {
  // インデントの線を描画する
  final paint = Paint()
    ..color = Colors.grey
    ..strokeWidth = 1;
  var leftX = indentWidth / 2;

  // 一行上のIdeaのindentLevelを取得する
  int upperIndentLevel = 0;
  int upperIndex = index - 1;

  //描画：Canvasの起点は左側センター
  if (indentLevel > 0 && index > 0 /*一番上の時はツリーを描画しない*/) {
    //一番上の親が居ない場合の特別対応：自分の上のどこかに、indentLevelが小さい親がいるかチェック
    bool cancelFlg = false; //描画しない特別な場合用
    var i = index - 1;
    while (i >= 0) {
      if ((LaneBodyInheritedWidget.of(context)
          .ideas[i].indentLevel) <
          indentLevel) {
        break;
      }
      i--;
    }
    if (i == -1) cancelFlg = true;

    if (!cancelFlg) {
      //縦の線：左側の基準
      leftX = leftX + (indentWidth * (indentLevel - 1));
      //縦の線：自分の領域内で上に引く
      double startY = 0 - (textFieldHeight / 2) - (ideaVerticalMargin * 2);

      //縦の線：自分の領域外でどのくらい上まで引くかを計算
      upperIndentLevel = LaneBodyInheritedWidget.of(context)
          .ideas[upperIndex].indentLevel;
      if (indentLevel <= upperIndentLevel) {
        while (indentLevel < upperIndentLevel && upperIndex >= 0) {
          startY -= (textFieldHeight + ideaVerticalMargin * 2);
          upperIndex--;
          upperIndentLevel = LaneBodyInheritedWidget.of(context)
              .ideas[upperIndex].indentLevel;
        }
        if (indentLevel <= upperIndentLevel) {
          startY -= textFieldHeight / 2;
        }
      }

      //縦の線
      canvas.drawLine(Offset(leftX, 0), Offset(leftX, startY), paint);
      //横の線
      canvas.drawLine(Offset(leftX, size.height),Offset(indentWidth * indentLevel, size.height), paint);
    }
  }
}

void findAndRepaintAffectedIdeas(BuildContext context, int myIndex, int myIndentLevel, int startIndex, int endIndex){
  // Find the start index
  for (int i = myIndex - 1; i >= 0; i--) {
    if (LaneBodyInheritedWidget.of(context)
        .ideas[i].indentLevel == myIndentLevel - 1) {
      startIndex = i;
      break;
    }
  }
  // Find the end index
  for (int i = myIndex + 1;
  i < LaneBodyInheritedWidget.of(context).ideas.length;
  i++) {
    if ((LaneBodyInheritedWidget.of(context)
        .ideas[i].indentLevel) >= myIndentLevel) {
      endIndex = i;
      break;
    }
  }
  LaneBodyInheritedWidget.of(context).redrawAffectedIdeas(startIndex, endIndex);
  CanvasZoneInheritedWidget.of(context).setState(() {}); //Relationの線を描画
}

Future<String> get _defaultFileName async {
  final directory = await getApplicationDocumentsDirectory();
  return '${directory.path}/default.json';
}

void showAlert( String msg, BuildContext context) {
  showDialog(
    context: context,
    builder: (BuildContext context) {
      return AlertDialog(
        content: Text(msg),
        actions: [
          TextButton(
            onPressed: () {
              Navigator.pop(context, 'OK');
            },
            child: const Text('OK'))
        ],);
    } );
}

Future<void> saveData({String? fileName, required CanvasZoneState? state}) async {
  List<Map<String, dynamic>> lanesJson = [];

  fileName ??= await _defaultFileName;

  if(state == null) return;

  for (var lane in state.lanes ) {
    List<Map<String, dynamic>> ideasJson = [];
    for (var idea in lane.ideas) {
      ideasJson.add({
        'index': idea.index,
        'indentLevel': idea.indentLevel,
        'content': idea.key.currentState?.textController.text ?? '',
      });
    }
    lanesJson.add({
      'key': lane.key.toString(),
      'index': lane.index,
      'title': state.laneHeaders[lane.index].key.currentState?.titleController.text ?? '',
      'ideas': ideasJson,
    });
  }

  List<Map<String, dynamic>> ideasRelationJson = [];
  state.ref.read(ideasRelationList).forEach((relationSet) {
    ideasRelationJson.add({
      'from_lane_index': relationSet.fromIdea.parentLane?.index,
      'from_idea_index': relationSet.fromIdea.index,
      'from_shape':      relationSet.fromShape == RelationShape.dot ? 'dot' : 'arrow',
      'to_lane_index': relationSet.toIdea.parentLane?.index,
      'to_idea_index': relationSet.toIdea.index,
      'to_shape':      relationSet.toShape == RelationShape.dot ? 'dot' : 'arrow',
      'note':               relationSet.note,
    });
  });

  String jsonString = jsonEncode({'lanes': lanesJson, 'ideasRelation': ideasRelationJson});
  await File(fileName).writeAsString(jsonString);
}

Future<void> loadData({String? fileName, required CanvasZoneState? state}) async {
  fileName ??= await _defaultFileName;
  final file = File(fileName);
  if (await file.exists() == false) {
    showAlert('No such files:{$fileName}', state!.context);
    return;
  }
  String jsonString = await file.readAsString();
  Map<String, dynamic> jsonMap = jsonDecode(jsonString);

  if(state == null) return;

  List<LaneBody> loadedLanes = [];
  List<LaneHeader> loadedLaneHeaders = [];
  for (var laneJson in jsonMap['lanes']) {
    List<Idea> loadedIdeas = [];

    var newLane = LaneBody(
      index: laneJson['index'] ?? 0,
      title: laneJson['title'] ?? '',
      ideas: loadedIdeas,
    );
    var newLaneHeader = LaneHeader(index: laneJson['index'] ?? 0, relatedLane: newLane);
    newLaneHeader.title = laneJson['title'] ?? '';
    loadedLaneHeaders.add(newLaneHeader);

    for (var ideaJson in laneJson['ideas']) {
      loadedIdeas.add(Idea(
        index: ideaJson['index'],
        indentLevel: ideaJson['indentLevel'],
        parentLane: newLane,
      ));
    }
    loadedLanes.add(newLane);
  }
  for (int i = 0; i < loadedLanes.length; i++) {
    for (int j = 0; j < loadedLanes[i].ideas.length; j++) {
      loadedLanes[i].ideas[j].content = jsonMap['lanes'][i]['ideas'][j]['content'];
    }
  }
  state.lanes = loadedLanes;
  state.laneHeaders = loadedLaneHeaders;
  state.ref.watch(ideasRelationList.notifier).state.clear();

  if (jsonMap['ideasRelation'] != null) {
    for (var ideaRelationJson in jsonMap['ideasRelation']) {
      var fromLaneIndex = ideaRelationJson['from_lane_index'];
      var fromIdeaIndex = ideaRelationJson['from_idea_index'];
      var toLaneIndex = ideaRelationJson['to_lane_index'];
      var toIdeaIndex = ideaRelationJson['to_idea_index'];
      IdeasRelation relationSet = IdeasRelation(
          fromIdea: loadedLanes[fromLaneIndex].ideas[fromIdeaIndex], toIdea: loadedLanes[toLaneIndex].ideas[toIdeaIndex]);
      if(ideaRelationJson['from_shape'] == 'arrow') {
        relationSet.fromShape = RelationShape.arrow;
      }
      if(ideaRelationJson['to_shape'] == 'arrow') {
        relationSet.toShape = RelationShape.arrow;
      }
      relationSet.note = ideaRelationJson['note'];
      state.ref.watch(ideasRelationList.notifier).state.add(relationSet);

      loadedLanes[fromLaneIndex].ideas[fromIdeaIndex].relatedIdeasTo.add(loadedLanes[toLaneIndex].ideas[toIdeaIndex]);
      loadedLanes[toLaneIndex].ideas[toIdeaIndex].relatedIdeasFrom.add(loadedLanes[fromLaneIndex].ideas[fromIdeaIndex]);
    }
  }
}