添加Avalonia项目的demo

Serein.Workbench.Avalonia/Controls/DragControls.cs

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+using Avalonia.Controls;
+using Avalonia.Input;
+using Avalonia.Markup.Xaml;
+using Avalonia.Threading;
+using Avalonia;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Avalonia.VisualTree;
+
+namespace Serein.Workbench.Avalonia.Controls
+{
+    /// <summary>
+    /// 实现拖动的控件
+    /// </summary>
+    public partial class DragControls : UserControl
+    {
+        /// <summary>
+        /// 记录上一次鼠标位置
+        /// </summary>
+        private Point lastMousePosition;
+
+        /// <summary>
+        /// 用于平滑更新坐标的计时器
+        /// </summary>
+        private DispatcherTimer _timer;
+
+        /// <summary>
+        /// 标记是否先启动了拖动
+        /// </summary>
+        private bool isDragging = false;
+
+        /// <summary>
+        /// 需要更新的坐标点
+        /// </summary>
+        private PixelPoint _targetPosition;
+
+        public DragControls()
+        {
+            InitializeComponent();
+
+            // 添加当前控件的事件监听
+            PointerPressed += OnPointerPressed;
+            PointerMoved += OnPointerMoved;
+            PointerReleased += OnPointerReleased;
+
+            // 初始化计时器
+            _timer = new DispatcherTimer
+            {
+
+
+                Interval = TimeSpan.FromMilliseconds(10)
+            };
+            _timer.Tick += OnTimerTick;
+        }
+
+        /// <summary>
+        /// 计时器事件
+        /// </summary>
+        /// <param name="sender"></param>
+        /// <param name="e"></param>
+        private void OnTimerTick(object sender, EventArgs e)
+        {
+
+
+            var window = this.FindAncestorOfType<Window>();
+            if (window != null && window.Position != _targetPosition)
+            {
+
+
+                // 更新坐标
+                window.Position = _targetPosition;
+            }
+        }
+
+        private void InitializeComponent()
+        {
+            AvaloniaXamlLoader.Load(this);
+        }
+
+        private void OnPointerPressed(object sender, PointerPressedEventArgs e)
+        {
+
+
+            if (!e.GetCurrentPoint(this).Properties.IsLeftButtonPressed) return;
+            // 启动拖动
+            isDragging = true;
+            // 记录当前坐标
+            lastMousePosition = e.GetPosition(this);
+            e.Handled = true;
+            // 启动计时器
+            _timer.Start();
+        }
+
+        private void OnPointerReleased(object sender, PointerReleasedEventArgs e)
+        {
+
+
+            if (!isDragging) return;
+            // 停止拖动
+            isDragging = false;
+            e.Handled = true;
+            // 停止计时器
+            _timer.Stop();
+        }
+
+        private void OnPointerMoved(object sender, PointerEventArgs e)
+        {
+            if (!e.GetCurrentPoint(this).Properties.IsLeftButtonPressed) return;
+
+            // 如果没有启动拖动，则不执行
+            if (!isDragging) return;
+
+            var currentMousePosition = e.GetPosition(this);
+            var offset = currentMousePosition - lastMousePosition;
+            var window = this.FindAncestorOfType<Window>();
+            if (window != null)
+            {
+                // 记录当前坐标
+                _targetPosition = new PixelPoint(window.Position.X + (int)offset.X,
+                    window.Position.Y + (int)offset.Y);
+            }
+        }
+    }
+}