crosslangdevstudio/ViewModels/FileEditorViewModel.cs

using System;
using System.Collections.ObjectModel;
using System.IO;
using System.Threading.Tasks;
using Avalonia;
using Avalonia.Controls;
using Avalonia.Platform.Storage;

using CommunityToolkit.Mvvm.ComponentModel;
using CommunityToolkit.Mvvm.Input;
using CommunityToolkit.Mvvm.Messaging;
using CrossLangDevStudio.Messages;
using CrossLangDevStudio.Views;

namespace CrossLangDevStudio.ViewModels;

public partial class FileEditorViewModel : ViewModelBase, ISavable
{
    TabItemViewModel tab;
    public string FilePath { get; }
    bool _modified = false;
    private bool Modified
    {
        get => _modified;
        set
        {
            _modified = value;

            if (value)
            {
                tab.Header = $"{Path.GetFileName(FilePath)}*";
            }
            else
            {
                tab.Header = Path.GetFileName(FilePath);
            }
        }
    }
    
    private string _text = "";

    public string Text
    {
        get => _text;
        set
        {

            Modified = true;
            this.SetProperty(ref _text, value, nameof(Text));
        }
    }

    public FileEditorViewModel(string path,TabItemViewModel tab)
    {
        this.tab = tab;
        FilePath = path;
        _text = File.ReadAllText(path);
    }

    public void Save()
    {
        File.WriteAllText(FilePath, Text);
        Modified = false;
    }
}