Revert "Revert "block 可以拖拽到内部，还有少量问题待解决""

This reverts commit fcd7beb193.

Extensions/AIStudio.Wpf.Block/Controls/BlockDecorator.cs

@@ -0,0 +1,114 @@
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Media;
+
+namespace AIStudio.Wpf.Block.Controls
+{
+    public class BlockDecorator : Decorator
+    {
+        #region 依赖属性
+        public static readonly DependencyProperty BackgroundProperty =
+            DependencyProperty.Register(nameof(Background), typeof(Brush), typeof(BlockDecorator)
+                , new PropertyMetadata(new SolidColorBrush(Color.FromRgb(255, 255, 255))));
+        /// <summary>
+        /// 背景色，默认值为#FFFFFF，白色
+        /// </summary>
+        public Brush Background
+        {
+            get
+            {
+                return (Brush)GetValue(BackgroundProperty);
+            }
+            set
+            {
+                SetValue(BackgroundProperty, value);
+            }
+        }
+
+        public static readonly DependencyProperty PaddingProperty =
+            DependencyProperty.Register(nameof(Padding), typeof(Thickness), typeof(BlockDecorator)
+                , new PropertyMetadata(new Thickness(0, 0, 0, 0)));
+        /// <summary>
+        /// 内边距
+        /// </summary>
+        public Thickness Padding
+        {
+            get
+            {
+                return (Thickness)GetValue(PaddingProperty);
+            }
+            set
+            {
+                SetValue(PaddingProperty, value);
+            }
+        }
+
+        public static readonly DependencyProperty BorderBrushProperty =
+            DependencyProperty.Register(nameof(BorderBrush), typeof(Brush), typeof(BlockDecorator)
+                , new PropertyMetadata(default(Brush)));
+        /// <summary>
+        /// 边框颜色
+        /// </summary>
+        public Brush BorderBrush
+        {
+            get
+            {
+                return (Brush)GetValue(BorderBrushProperty);
+            }
+            set
+            {
+                SetValue(BorderBrushProperty, value);
+            }
+        }
+
+        public static readonly DependencyProperty BorderThicknessProperty =
+            DependencyProperty.Register(nameof(BorderThickness), typeof(Thickness), typeof(BlockDecorator), new PropertyMetadata(new Thickness(0d)));
+        /// <summary>
+        /// 边框大小
+        /// </summary>
+        public Thickness BorderThickness
+        {
+            get
+            {
+                return (Thickness)GetValue(BorderThicknessProperty);
+            }
+            set
+            {
+                SetValue(BorderThicknessProperty, value);
+            }
+        }
+        #endregion
+
+        protected override HitTestResult HitTestCore(PointHitTestParameters hitTestParameters)
+        {
+            Point hitPoint = hitTestParameters.HitPoint;
+
+            // 在此处实现自定义的命中测试逻辑
+            if (IsPointInsideCustomRegion(hitPoint))
+            {
+                return new PointHitTestResult(this, hitPoint);
+            }
+
+            return null; // 不命中
+        }
+
+        private bool IsPointInsideCustomRegion(Point point)
+        {
+            // 在此处检测点是否在自定义区域内
+            // 返回 true 表示命中，返回 false 表示不命中
+            return false; 
+        }
+
+        protected Brush CreateFillBrush()
+        {
+            Brush result = null;
+
+            System.Windows.Media.GradientStopCollection gsc = new System.Windows.Media.GradientStopCollection();
+            gsc.Add(new System.Windows.Media.GradientStop(((SolidColorBrush)this.Background).Color, 0));
+            LinearGradientBrush backGroundBrush = new LinearGradientBrush(gsc, new Point(0, 0), new Point(0, 1));
+            result = backGroundBrush;
+
+            return result;
+        }
+    }
+}