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Доработара WinUI реализация.

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FrigaT
2026-01-25 05:36:28 +03:00
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Lattice.UI.DragDrop.WinUI/Behaviors/WinUIDragSourceBehavior.cs
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using Lattice.Core.DragDrop.Models;
using Lattice.Core.DragDrop.Abstractions;
using Lattice.Core.DragDrop.Models;
using Lattice.Core.DragDrop.Services;
using Lattice.Core.Geometry;
using Lattice.UI.DragDrop.Behaviors;
using Lattice.UI.DragDrop.WinUI.Services;
using Microsoft.UI.Xaml;
using Microsoft.UI.Xaml.Controls;
using Microsoft.UI.Xaml.Input;
using System;
using System.Threading;
using System.Threading.Tasks;
namespace Lattice.UI.DragDrop.WinUI.Behaviors;
/// <summary>
/// Поведение источника перетаскивания для WinUI FrameworkElement.
/// Реализация поведения источника перетаскивания для элементов WinUI.
/// </summary>
public class WinUIDragSourceBehavior : DragSourceBehaviorBase<FrameworkElement>
/// <remarks>
/// <para>
/// Этот класс обрабатывает события мыши/тач и преобразует их в операции перетаскивания.
/// Он реализует интерфейс <see cref="IDragSource"/> для интеграции с системой перетаскивания.
/// </para>
/// <para>
/// Поведение автоматически отслеживает начало перемещения мыши, проверяет порог
/// перетаскивания и инициирует операцию через <see cref="IDragDropService"/>.
/// </para>
/// </remarks>
public sealed class WinUIDragSourceBehavior : IDragSource
{
/// <summary>
/// Прикрепленное свойство для данных перетаскивания.
/// </summary>
public static readonly DependencyProperty DragDataProperty =
DependencyProperty.RegisterAttached(
"DragData",
typeof(object),
typeof(WinUIDragSourceBehavior),
new PropertyMetadata(null));
#region Поля
private readonly IDragDropService _dragDropService;
private readonly WinUIDragDropHost _host;
private FrameworkElement? _element;
private object? _dragData;
private Point _dragStartPosition;
private bool _isDragging;
private CancellationTokenSource? _cancellationTokenSource;
#endregion
#region Конструктор
/// <summary>
/// Прикрепленное свойство для включения перетаскивания.
/// Инициализирует новый экземпляр класса <see cref="WinUIDragSourceBehavior"/>.
/// </summary>
public static readonly DependencyProperty IsEnabledProperty =
DependencyProperty.RegisterAttached(
"IsEnabled",
typeof(bool),
typeof(WinUIDragSourceBehavior),
new PropertyMetadata(false, OnIsEnabledChanged));
/// <summary>
/// Получает значение DragData.
/// </summary>
public static object GetDragData(FrameworkElement element)
/// <param name="dragDropService">Сервис для управления операциями перетаскивания.</param>
/// <param name="host">Хост для отображения визуальных элементов.</param>
/// <exception cref="ArgumentNullException">
/// Выбрасывается, если любой из параметров равен null.
/// </exception>
public WinUIDragSourceBehavior(IDragDropService dragDropService, WinUIDragDropHost host)
{
return element.GetValue(DragDataProperty);
_dragDropService = dragDropService ?? throw new ArgumentNullException(nameof(dragDropService));
_host = host ?? throw new ArgumentNullException(nameof(host));
}
#endregion
#region Публичные методы
/// <summary>
/// Прикрепляет поведение к указанному элементу.
/// </summary>
/// <param name="element">Элемент, к которому прикрепляется поведение.</param>
/// <param name="dragData">Данные для перетаскивания. Если не указано, используются
/// DataContext или Tag элемента.</param>
/// <exception cref="ArgumentNullException">
/// Выбрасывается, если <paramref name="element"/> равен null.
/// </exception>
/// <remarks>
/// После вызова этого метода элемент начинает обрабатывать события перетаскивания.
/// </remarks>
public void Attach(FrameworkElement element, object? dragData = null)
{
Detach();
_element = element ?? throw new ArgumentNullException(nameof(element));
_dragData = dragData ?? element.DataContext ?? element.Tag;
SubscribeToEvents();
}
/// <summary>
/// Устанавливает значение DragData.
/// Открепляет поведение от элемента.
/// </summary>
public static void SetDragData(FrameworkElement element, object value)
public void Detach()
{
element.SetValue(DragDataProperty, value);
}
if (_element == null) return;
/// <summary>
/// Получает значение IsEnabled.
/// </summary>
public static bool GetIsEnabled(FrameworkElement element)
{
return (bool)element.GetValue(IsEnabledProperty);
}
UnsubscribeFromEvents();
/// <summary>
/// Устанавливает значение IsEnabled.
/// </summary>
public static void SetIsEnabled(FrameworkElement element, bool value)
{
element.SetValue(IsEnabledProperty, value);
}
private static void OnIsEnabledChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
if (d is FrameworkElement element)
if (_isDragging)
{
// Получаем или создаем экземпляр поведения через Attached Property
var behavior = GetBehavior(element);
if ((bool)e.NewValue)
{
if (behavior == null)
{
behavior = new WinUIDragSourceBehavior();
SetBehavior(element, behavior);
}
behavior.AssociatedElement = element;
}
else
{
if (behavior != null)
{
behavior.Detach();
SetBehavior(element, null);
}
}
_dragDropService.CancelDragAsync().ConfigureAwait(false);
}
_element = null;
_dragData = null;
_isDragging = false;
_cancellationTokenSource?.Dispose();
_cancellationTokenSource = null;
}
public WinUIDragSourceBehavior()
: base(ServiceProviderHelper.GetServiceProvider())
#endregion
#region Обработчики событий
private void SubscribeToEvents()
{
if (_element == null) return;
_element.PointerPressed += OnPointerPressed;
_element.PointerMoved += OnPointerMoved;
_element.PointerReleased += OnPointerReleased;
_element.PointerCanceled += OnPointerCanceled;
_element.PointerCaptureLost += OnPointerCaptureLost;
}
protected override void SubscribeToEvents(FrameworkElement element)
private void UnsubscribeFromEvents()
{
element.PointerPressed += OnPointerPressed;
element.PointerMoved += OnPointerMoved;
element.PointerReleased += OnPointerReleased;
element.PointerCanceled += OnPointerCanceled;
element.PointerCaptureLost += OnPointerCaptureLost;
element.LostFocus += OnLostFocus;
}
if (_element == null) return;
protected override void UnsubscribeFromEvents(FrameworkElement element)
{
element.PointerPressed -= OnPointerPressed;
element.PointerMoved -= OnPointerMoved;
element.PointerReleased -= OnPointerReleased;
element.PointerCanceled -= OnPointerCanceled;
element.PointerCaptureLost -= OnPointerCaptureLost;
element.LostFocus -= OnLostFocus;
_element.PointerPressed -= OnPointerPressed;
_element.PointerMoved -= OnPointerMoved;
_element.PointerReleased -= OnPointerReleased;
_element.PointerCanceled -= OnPointerCanceled;
_element.PointerCaptureLost -= OnPointerCaptureLost;
}
private void OnPointerPressed(object sender, PointerRoutedEventArgs e)
{
if (AssociatedElement == null) return;
if (_element == null || _isDragging) return;
var point = e.GetCurrentPoint(AssociatedElement);
OnInteractionStarted(new Point(point.Position.X, point.Position.Y));
var point = e.GetCurrentPoint(_element);
_dragStartPosition = new Point(point.Position.X, point.Position.Y);
_cancellationTokenSource?.Dispose();
_cancellationTokenSource = new CancellationTokenSource();
}
private void OnPointerMoved(object sender, PointerRoutedEventArgs e)
private async void OnPointerMoved(object sender, PointerRoutedEventArgs e)
{
if (AssociatedElement == null) return;
if (_element == null || _isDragging || _cancellationTokenSource?.IsCancellationRequested == true)
return;
var point = e.GetCurrentPoint(AssociatedElement);
OnInteractionMoved(new Point(point.Position.X, point.Position.Y));
var point = e.GetCurrentPoint(_element);
var currentPosition = new Point(point.Position.X, point.Position.Y);
var distance = CalculateDistance(_dragStartPosition, currentPosition);
if (distance > _dragDropService.DragStartThreshold)
{
await StartDragAsync(currentPosition);
}
}
private void OnPointerReleased(object sender, PointerRoutedEventArgs e)
{
OnInteractionEnded();
ResetState();
}
private void OnPointerCanceled(object sender, PointerRoutedEventArgs e)
{
OnInteractionCancelled();
ResetState();
}
private void OnPointerCaptureLost(object sender, PointerRoutedEventArgs e)
{
OnInteractionCancelled();
ResetState();
}
private void OnLostFocus(object sender, RoutedEventArgs e)
private double CalculateDistance(Point p1, Point p2)
{
OnInteractionCancelled();
var dx = p2.X - p1.X;
var dy = p2.Y - p1.Y;
return Math.Sqrt(dx * dx + dy * dy);
}
protected override Point ConvertToScreenCoordinates(Point point)
/// <summary>
/// Преобразует координаты элемента в экранные координаты.
/// </summary>
/// <param name="point">Точка в координатах элемента.</param>
/// <returns>Точка в экранных координатах.</returns>
private Point ConvertToScreenCoordinates(Point point)
{
if (AssociatedElement == null)
if (_element == null) return point;
try
{
var transform = _element.TransformToVisual(Window.Current.Content);
var screenPoint = transform.TransformPoint(new Windows.Foundation.Point(point.X, point.Y));
return new Point(screenPoint.X, screenPoint.Y);
}
catch
{
return point;
var transform = AssociatedElement.TransformToVisual(null);
var screenPoint = transform.TransformPoint(new Windows.Foundation.Point(point.X, point.Y));
return new Point(screenPoint.X, screenPoint.Y);
}
/// <inheritdoc/>
public override async Task<(bool CanStart, DragInfo? DragInfo)> CanStartDragAsync()
{
if (AssociatedElement == null)
{
return (false, null);
}
var data = GetDragData(AssociatedElement);
if (data == null)
{
// Пробуем получить данные из Tag или других источников
data = AssociatedElement.Tag ?? AssociatedElement.DataContext;
}
if (data == null)
{
return (false, null);
}
// Получаем начальную позицию в экранных координатах
var startPosition = ConvertToScreenCoordinates(_dragStartPosition);
// Создаем DragInfo с учетом вашего конструктора
var dragInfo = new DragInfo(
data: data,
allowedEffects: Core.DragDrop.Enums.DragDropEffects.Move |
Core.DragDrop.Enums.DragDropEffects.Copy,
startPosition: startPosition,
source: this
);
return (true, dragInfo);
}
protected override void OnDragCompleted(DragInfo dragInfo, Core.DragDrop.Enums.DragDropEffects effects)
{
base.OnDragCompleted(dragInfo, effects);
// Визуальная обратная связь при завершении
SetVisualState(AssociatedElement, "Normal");
}
protected override void OnDragCancelled(DragInfo dragInfo)
{
base.OnDragCancelled(dragInfo);
// Визуальная обратная связь при отмене
SetVisualState(AssociatedElement, "Normal");
}
private void SetVisualState(FrameworkElement? element, string stateName)
{
if (element is Control control)
{
try
{
VisualStateManager.GoToState(control, stateName, true);
}
catch
{
// Fallback
control.Opacity = 1.0;
}
}
else if (element != null)
{
// Альтернативная визуальная обратная связь для не-Control элементов
element.Opacity = 1.0;
}
}
// Attached property для хранения экземпляра поведения
private static readonly DependencyProperty BehaviorProperty =
DependencyProperty.RegisterAttached(
"Behavior",
typeof(WinUIDragSourceBehavior),
typeof(WinUIDragSourceBehavior),
new PropertyMetadata(null));
private static WinUIDragSourceBehavior GetBehavior(FrameworkElement element)
private async Task StartDragAsync(Point position)
{
return (WinUIDragSourceBehavior)element.GetValue(BehaviorProperty);
}
if (_element == null || _dragData == null || _isDragging) return;
private static void SetBehavior(FrameworkElement element, WinUIDragSourceBehavior? value)
{
element.SetValue(BehaviorProperty, value);
}
}
/// <summary>
/// Вспомогательный класс для получения IServiceProvider.
/// </summary>
internal static class ServiceProviderHelper
{
private static IServiceProvider? _serviceProvider;
public static IServiceProvider GetServiceProvider()
{
if (_serviceProvider == null)
try
{
// Ищем IServiceProvider в Application.Current.Resources
if (Application.Current.Resources.TryGetValue("ServiceProvider", out var provider) &&
provider is IServiceProvider serviceProvider)
{
_serviceProvider = serviceProvider;
}
else
{
throw new InvalidOperationException(
"IServiceProvider не найден. Убедитесь, что ServiceProvider зарегистрирован в ресурсах приложения.");
}
var screenPosition = ConvertToScreenCoordinates(position);
var started = await _dragDropService.StartDragAsync(this, screenPosition);
_isDragging = started;
}
catch
{
ResetState();
}
return _serviceProvider;
}
public static void SetServiceProvider(IServiceProvider serviceProvider)
private void ResetState()
{
_serviceProvider = serviceProvider;
_isDragging = false;
_dragStartPosition = default;
_cancellationTokenSource?.Cancel();
_cancellationTokenSource?.Dispose();
_cancellationTokenSource = null;
}
#endregion
#region IDragSource Implementation
public async Task<DragInfo?> TryStartDragAsync(Point startPosition, CancellationToken cancellationToken = default)
{
if (_element == null || _dragData == null)
return null;
try
{
var dragInfo = new DragInfo(
data: _dragData,
allowedEffects: Core.DragDrop.Enums.DragDropEffects.Copy |
Core.DragDrop.Enums.DragDropEffects.Move,
startPosition: startPosition,
source: this
);
return dragInfo;
}
catch
{
return null;
}
}
public Task OnDragCompletedAsync(DragInfo dragInfo, Core.DragDrop.Enums.DragDropEffects effects, CancellationToken cancellationToken = default)
{
_isDragging = false;
return Task.CompletedTask;
}
public Task OnDragCancelledAsync(DragInfo dragInfo, CancellationToken cancellationToken = default)
{
_isDragging = false;
return Task.CompletedTask;
}
#endregion
}