Lattice/Lattice.Example.DragDrop/Handlers/CustomDropHandler.cs

using Lattice.Core.DragDrop.Abstractions;
using Lattice.Core.DragDrop.Models;
using System;
using System.Threading;
using System.Threading.Tasks;

namespace Lattice.Example.DragDrop;

public class CustomDropHandler : IDropTarget
{
    private readonly Action<object> _onDrop;

    public CustomDropHandler(Action<object> onDrop)
    {
        _onDrop = onDrop;
    }

    public async Task<bool> CanAcceptDropAsync(DropInfo dropInfo, CancellationToken cancellationToken = default)
    {
        // Принимаем только объекты типа DragDropItem
        return dropInfo.Data is DragDropItem;
    }

    public async Task OnDragOverAsync(DropInfo dropInfo, CancellationToken cancellationToken = default)
    {
        if (dropInfo.Data is DragDropItem)
        {
            dropInfo.SuggestedEffects = Core.DragDrop.Enums.DragDropEffects.Copy;
            dropInfo.ShowVisualFeedback = true;
        }
    }

    public async Task OnDropAsync(DropInfo dropInfo, CancellationToken cancellationToken = default)
    {
        if (dropInfo.Data is DragDropItem item)
        {
            _onDrop(item);
            dropInfo.MarkAsHandled();
        }
    }

    public Task OnDragLeaveAsync(CancellationToken cancellationToken = default)
    {
        return Task.CompletedTask;
    }
}