DragAndDrop core

Lattice.UI.DragDrop.WinUI/Services/WinUIDragDropIntegrationService.cs

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+using Lattice.Core.DragDrop.Services;
+using Lattice.UI.DragDrop.Abstractions;
+using Microsoft.UI.Xaml;
+using Microsoft.UI.Xaml.Controls;
+using System;
+
+namespace Lattice.UI.DragDrop.WinUI.Services;
+
+/// <summary>
+/// Сервис интеграции Drag & Drop с WinUI приложением.
+/// </summary>
+public class WinUIDragDropIntegrationService : IDisposable
+{
+    private readonly IDragDropService _dragDropService;
+    private readonly IDragVisualProvider _dragVisualProvider;
+    private readonly Canvas _overlayCanvas;
+    private readonly Window _window;
+    private object? _currentDragVisual;
+    private bool _disposed;
+
+    /// <summary>
+    /// Инициализирует новый экземпляр класса <see cref="WinUIDragDropIntegrationService"/>.
+    /// </summary>
+    public WinUIDragDropIntegrationService(
+        Window window,
+        IDragDropService dragDropService,
+        IDragVisualProvider dragVisualProvider)
+    {
+        _window = window ?? throw new ArgumentNullException(nameof(window));
+        _dragDropService = dragDropService ?? throw new ArgumentNullException(nameof(dragDropService));
+        _dragVisualProvider = dragVisualProvider ?? throw new ArgumentNullException(nameof(dragVisualProvider));
+
+        // Создаем оверлейный Canvas для визуальных элементов
+        _overlayCanvas = new Canvas
+        {
+            IsHitTestVisible = false,
+            Background = null
+        };
+
+        // Подписываемся на события перетаскивания
+        SubscribeToEvents();
+    }
+
+    /// <summary>
+    /// Встраивает оверлей в указанный контейнер.
+    /// </summary>
+    public void AttachToContainer(Panel container)
+    {
+        if (container == null)
+            throw new ArgumentNullException(nameof(container));
+
+        // Убеждаемся, что оверлей находится поверх всех элементов
+        Canvas.SetZIndex(_overlayCanvas, int.MaxValue);
+        container.Children.Add(_overlayCanvas);
+    }
+
+    private void SubscribeToEvents()
+    {
+        _dragDropService.DragStarted += OnDragStarted;
+        _dragDropService.DragUpdated += OnDragUpdated;
+        _dragDropService.DragCompleted += OnDragCompleted;
+        _dragDropService.DragCancelled += OnDragCancelled;
+    }
+
+    private void UnsubscribeFromEvents()
+    {
+        _dragDropService.DragStarted -= OnDragStarted;
+        _dragDropService.DragUpdated -= OnDragUpdated;
+        _dragDropService.DragCompleted -= OnDragCompleted;
+        _dragDropService.DragCancelled -= OnDragCancelled;
+    }
+
+    private void OnDragStarted(object? sender, DragStartedEventArgs e)
+    {
+        // Создаем визуальное представление
+        _currentDragVisual = _dragVisualProvider.CreateDragVisual(
+            e.DragInfo,
+            e.StartPosition);
+
+        // Добавляем на оверлей
+        if (_currentDragVisual is UIElement element)
+        {
+            _overlayCanvas.Children.Add(element);
+        }
+    }
+
+    private void OnDragUpdated(object? sender, DragUpdatedEventArgs e)
+    {
+        if (_currentDragVisual != null)
+        {
+            _dragVisualProvider.UpdateDragVisualPosition(_currentDragVisual, e.Position);
+        }
+    }
+
+    private void OnDragCompleted(object? sender, DragCompletedEventArgs e)
+    {
+        CleanupDragVisual();
+    }
+
+    private void OnDragCancelled(object? sender, DragCancelledEventArgs e)
+    {
+        CleanupDragVisual();
+    }
+
+    private void CleanupDragVisual()
+    {
+        if (_currentDragVisual != null)
+        {
+            _dragVisualProvider.ReleaseDragVisual(_currentDragVisual);
+            _currentDragVisual = null;
+        }
+    }
+
+    /// <inheritdoc/>
+    public void Dispose()
+    {
+        if (!_disposed)
+        {
+            UnsubscribeFromEvents();
+            CleanupDragVisual();
+
+            if (_overlayCanvas.Parent is Panel parent)
+            {
+                parent.Children.Remove(_overlayCanvas);
+            }
+
+            _disposed = true;
+        }
+
+        GC.SuppressFinalize(this);
+    }
+}