GSS2Rework/GSS2.UI.Core/ViewModels/AsyncImageViewModel.cs

using Avalonia.Media;
using Avalonia.Media.Imaging;
using Avalonia.Threading;

using CommunityToolkit.Mvvm.ComponentModel;

using GSS2.Core.Analysis.AmineContent.Database.Calibration;

namespace GSS2.UI.Core.ViewModels;

public partial class AsyncImageRecordViewModel : ViewModelBase
{
    private static readonly SemaphoreSlim _semaphore = new(1, 1);

    private readonly string _path;

    [ObservableProperty] public partial ImageRecord ImageRecord { get; set; }
    [ObservableProperty] public partial IImage? Image { get; set; }
    [ObservableProperty] public partial bool IsLoading { get; set; } = true;

    public AsyncImageRecordViewModel(string path, ImageRecord imageRecord)
    {
        _path = path;
        ImageRecord = imageRecord;
        _ = LoadAsync();
    }

    private async Task LoadAsync()
    {
        await _semaphore.WaitAsync();

        try
        {
            var bitmap = await Task.Run(() => new Bitmap(_path));

            await Dispatcher.UIThread.InvokeAsync(() =>
            {
                Image = bitmap;
                IsLoading = false;
            });
        }
        catch
        {
            await Dispatcher.UIThread.InvokeAsync(() => IsLoading = false);
        }
        finally
        {
            _semaphore.Release();
        }
    }
}