SimpleNote/ViewModel.cs

using System;
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.Windows.Input;
using Avalonia.Controls;
using Avalonia.Interactivity;
using CommunityToolkit.Mvvm.ComponentModel;
using CommunityToolkit.Mvvm.Input;

namespace SimpleNote;

public class ViewModel : ObservableObject
{
    private double _windowWidth = 200;
    public static double _fontSize = 20;
    private double _noteWidth;
    public object? LastFocusedNote;
    
    public ObservableCollection<Note> Notes { get; set; } = new ObservableCollection<Note>();
    public ICommand AddButtonPressedCommand { get; }

    public ViewModel()
    {
        AddButtonPressedCommand = new RelayCommand(AddButtonPressedCommandEvent);
    }
    
    public double WindowWidth
    {
        get => _windowWidth;
        set => SetProperty(ref _windowWidth, value);
    }

    public double NoteWidth
    {
        get => _noteWidth;
        set => SetProperty(ref _noteWidth, value);
    }
    
    public double FontSize
    {
        get => _fontSize;
        set => SetProperty(ref _fontSize, value);
    }

    private void AddButtonPressedCommandEvent(object? sender)
    {
        AddNote();
    }
    
    //[RelayCommand]
    private void AddNote()
    {
        // Füge eine neue Note zur Collection hinzu
        Note note = new Note
        {
            Width = MainWindow.TextWidth("New Note"), Content = "New Note", FontSize = FontSize,
        };
        note.RemoveButtonClicked = new RelayCommand(o => RemoveNote(note));
        Notes.Add(note);
        
    }
    
    private void RemoveNote(Note note)
    {
        if (Notes.Contains(note))
        {
            Notes.Remove(note);
        }
    }
    
    public event PropertyChangedEventHandler? PropertyChanged;
}

public class Note : ObservableObject
{
    public double Width { get; set; }
    public string _content;
    public double FontSize { get; set; }
    public RelayCommand RemoveButtonClicked { get; set; }

    public string Content
    {
        get => _content;
        set
        {
            _content = value;
            Width = MainWindow.TextWidth(_content);
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(Content)));
        }
    }
    
    public event PropertyChangedEventHandler? PropertyChanged;
}

public class RelayCommand : ICommand
{
    private readonly Action<object?> _execute;
    private readonly Func<object?, bool>? _canExecute;

    public event EventHandler? CanExecuteChanged;

    public RelayCommand(Action<object?> execute, Func<object?, bool>? canExecute = null)
    {
        _execute = execute ?? throw new ArgumentNullException(nameof(execute));
        _canExecute = canExecute;
    }

    public bool CanExecute(object? parameter) =>
        _canExecute?.Invoke(parameter) ?? true;

    public void Execute(object? parameter) =>
        _execute(parameter);

    public void RaiseCanExecuteChanged() =>
        CanExecuteChanged?.Invoke(this, EventArgs.Empty);
}