workouttest_app/lib/widgets/menu_page_widget.dart

import 'dart:ui';

import 'package:aitrainer_app/bloc/menu/menu_bloc.dart';
import 'package:aitrainer_app/localization/app_localization.dart';
import 'package:aitrainer_app/model/cache.dart';
import 'package:aitrainer_app/model/workout_tree.dart';
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:flutter/painting.dart';
import 'package:flutter_bloc/flutter_bloc.dart';

// ignore: must_be_immutable
class MenuPageWidget extends StatelessWidget {
  int parent;

  MenuPageWidget({this.parent});

  @override
  Widget build(BuildContext context) {
    MenuBloc menuBloc = BlocProvider.of<MenuBloc>(context);

    return CustomScrollView(
        scrollDirection: Axis.vertical,
        slivers: <Widget>[buildMenuColumn(parent, context, menuBloc)]);
  }

  SliverList buildMenuColumn(
      int parent, BuildContext context, MenuBloc menuBloc) {
    final List<Widget> _columnChildren = List();

    menuBloc.menuTreeRepository
        .getBranch(menuBloc.parent)
        .forEach((treeName, value) {
      WorkoutTree workoutTree = value as WorkoutTree;
      _columnChildren.add(Container(
          padding: EdgeInsets.only(top: 16.0),
          child: Center(
              child: Stack(
                alignment: Alignment.bottomLeft,
                //clipBehavior: Clip.antiAliasWithSaveLayer,
                children: [
                  FlatButton(
                    child: _getButtonImage(workoutTree),
                    padding: EdgeInsets.only(left: 0.0, bottom: 0),
                    shape: getShape(workoutTree),
                    onPressed: () => menuClick(workoutTree, menuBloc, context),
                  ),
                  Positioned(
                    top: workoutTree.name.length > 15 ? 140 : 150,
                    left: 5,
                    child: Container(
                      height: 300,
                      width: 280,
                      child: InkWell(
                        onTap:() => menuClick(workoutTree, menuBloc, context),
                        child: Text(
                          " " + workoutTree.name,
                          maxLines: 2,
                          style: TextStyle(
                            color: workoutTree.color,
                            fontSize: workoutTree.fontSize,
                            fontFamily: 'Arial',
                            fontWeight: FontWeight.w900),
                        ),

                        highlightColor: workoutTree.color,
                      ),
                      color: Colors.transparent,
                    ),
                  ),

              ]
            )
          )
        )
      );
    });

    SliverList sliverList =
        SliverList(delegate: SliverChildListDelegate(_columnChildren));

    return sliverList;
  }

  void menuClick(
      WorkoutTree workoutTree, MenuBloc menuBloc, BuildContext context) {
    print("Hi!, Menu clicked " + workoutTree.id.toString());
    if (workoutTree.child == false) {
      menuBloc.add(MenuTreeDown(parent: workoutTree.id));
    } else {
      menuBloc.add(MenuClickExercise(exerciseTypeId: workoutTree.id));
      if (Cache().userLoggedIn == null) {
        Scaffold.of(context).showSnackBar(SnackBar(
            backgroundColor: Colors.orange,
            content: Text(
                AppLocalizations.of(context).translate('Please log in'),
                style: TextStyle(color: Colors.white))));
      } else {
        if (workoutTree.exerciseType.name == "Custom" && Cache().userLoggedIn.admin == 1) {
          Navigator.of(context).pushNamed('exerciseCustomPage',
              arguments: workoutTree.exerciseType);
        } else {
          Navigator.of(context).pushNamed('exerciseNewPage',
              arguments: workoutTree.exerciseType);
        }
      }
    }
  }

  dynamic getShape(WorkoutTree workoutTree) {
    bool base = workoutTree.base;
    dynamic returnCode = (base == true)
        ? RoundedRectangleBorder(
            side: BorderSide(width: 4, color: Colors.orangeAccent),
          )
        : null;
    return returnCode;
  }

  dynamic _getButtonImage(WorkoutTree workoutTree) {
    dynamic image;
    try {
      image = Image.asset(
        workoutTree.imageName,
        height: 180,
        errorBuilder: (context, error, stackTrace) {
          String url =
            Cache.mediaUrl + 'images/' + workoutTree.imageName.substring(11);
          Widget image = FadeInImage.assetNetwork(
            placeholder: 'asset/image/dots.gif',
            image: url,
            height: 180,
          );
          return image;
        },
      );
    } on Exception catch (_) {
      String url = Cache.mediaUrl + '/images/' + workoutTree.imageName;
      image = FadeInImage.assetNetwork(
        placeholder: 'asset/image/dots.gif',
        image: url,
        height: 180,
      );
    }

    return image;
  }
}