cpd/lib/widgets/listview.dart

import 'package:flutter/material.dart';
import 'package:cpd/database/habit.dart';
import 'package:cpd/widgets/edithabit_dialog.dart';
import '../database/todo_interface.dart';


class MyListView extends StatefulWidget {
  final List<Habit> habits;
  //DB-Schnittstelle für Gewohnheiten
  final ToDoInterface todoDB;
  final Function fetchTodos;
  //Eine Funktion zum Aktualisieren des Zählers für abgeschlossene Gewohnheiten
  final Function(int) updateCounter;

  const MyListView({
    super.key,
    required this.habits,
    required this.todoDB,
    required this.fetchTodos,
    required this.updateCounter,
  });

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

class MyListViewState extends State<MyListView> {
  @override
  Widget build(BuildContext context) {
    int completedCount = widget.habits.where((habit) => habit.isComplete).length;

    return ListView.builder(
      shrinkWrap: true,
      padding: EdgeInsets.zero,
      itemCount: widget.habits.length,
      itemBuilder: (BuildContext context, int index) {
        final todo = widget.habits[index];
        String newTitle = todo.title;
        String? newSubtitle = todo.subtitle;
        IconData newIcon = todo.icon;

        return Padding(
          padding: const EdgeInsets.symmetric(vertical: 5, horizontal: 10),
          child: Card(
            color: index % 2 == 0 ? Colors.green[300] : Colors.green[100],
            child: Dismissible(
              key: UniqueKey(),
              background: Container(
                color: Colors.blue,
                alignment: Alignment.centerLeft,
                child: const Padding(
                  padding: EdgeInsets.only(left: 16),
                  child: Icon(Icons.edit),
                ),
              ),
              secondaryBackground: Container(
                color: Colors.red,
                alignment: Alignment.centerRight,
                child: const Padding(
                  padding: EdgeInsets.only(right: 16),
                  child: Icon(Icons.delete),
                ),
              ),
              onDismissed: (direction) async {
                // Löschen
                if (direction == DismissDirection.endToStart) {
                  ScaffoldMessenger.of(context).showSnackBar(
                      SnackBar(
                          content: Text("${widget.habits[index].title} was dismissed"))
                  );
                  await widget.todoDB.delete(todo.id);
                  setState(() {
                    widget.habits.removeAt(index);
                  });
                  widget.fetchTodos();
                }
                // Bearbeiten
                else if (direction == DismissDirection.startToEnd) {
                  showDialog(
                      context: context,
                      builder: (context) => EditHabitDialog(
                        todo: todo,
                        todoDB: widget.todoDB,
                        fetchTodos: widget.fetchTodos,
                      )
                  );
                  setState(() {
                    widget.habits.removeAt(index);
                  });
                }
              },
              child: ListTile(
                title: Text(newTitle),
                subtitle: Text(newSubtitle),
                trailing: Icon(newIcon),
                leading: Checkbox(
                  value: todo.isComplete,
                  onChanged: (value) async {
                    if (value != null) {
                      widget.todoDB.updateCompletionStatus(todo.id, value);
                      setState(() {
                        todo.isComplete = value;
                        completedCount += value ? 1 : -1;
                      });
                      widget.updateCounter(completedCount);
                      widget.fetchTodos();
                    }
                  },
                ),
              ),
            ),
          ),
        );
      },
    );
  }
}