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/VariableBlockBorder.cs

@@ -0,0 +1,114 @@
+using System;
+using System.Windows;
+using System.Windows.Input;
+using System.Windows.Media;
+
+namespace AIStudio.Wpf.Block.Controls
+{
+    public class VariableBlockBorder : BlockDecorator
+    {
+        public VariableBlockBorder()
+        {
+            
+        }
+
+        #region 方法重写
+        public double Minwidth { get; set; } = 64;
+        public double Minheight { get; set; } = 28;
+
+        /// <summary>
+        /// 该方法用于测量整个控件的大小
+        /// </summary>
+        /// <param name="constraint"></param>
+        /// <returns>控件的大小</returns>
+        protected override Size MeasureOverride(Size constraint)
+        {
+            Thickness padding = this.Padding;
+
+            Size result = new Size();
+            if (Child != null)
+            {
+                //测量子控件的大小
+                Child.Measure(constraint);
+
+                result.Width = Math.Max(Minwidth, Child.DesiredSize.Width + padding.Left + padding.Right);
+                result.Height = Math.Max(Minheight, Child.DesiredSize.Height + padding.Top + padding.Bottom);
+            }
+            else
+            {
+                result.Width = Minwidth;
+                result.Height = Minheight;
+            }
+            return result;
+        }
+
+        /// <summary>
+        /// 设置子控件的大小与位置
+        /// </summary>
+        /// <param name="arrangeSize"></param>
+        /// <returns></returns>
+        protected override Size ArrangeOverride(Size arrangeSize)
+        {
+            Thickness padding = this.Padding;
+            if (Child != null)
+            {
+                Child.Arrange(new Rect(new Point(padding.Left, padding.Top),
+                    new Size(Math.Max(Minwidth - padding.Left - padding.Right, Child.DesiredSize.Width), Math.Max(Minheight - padding.Top - padding.Bottom, Child.DesiredSize.Height))));
+            }
+            return arrangeSize;
+        }
+
+        /// <summary>
+        /// 绘制控件
+        /// </summary>
+        /// <param name="drawingContext"></param>
+        protected override void OnRender(DrawingContext drawingContext)
+        {
+            Thickness padding = this.Padding;
+
+            Pen pen = new Pen();
+            pen.Brush = this.BorderBrush;
+            pen.Thickness = this.BorderThickness.Left;// NextForBlockBorder.RoundLayoutValue(BorderThickness.Left, DoubleUtil.DpiScaleX);
+
+            Geometry cg = CreateGeometry(Math.Max(Minwidth, Child?.DesiredSize.Width ?? 0 + padding.Left + padding.Right), Math.Max(Minheight, Child?.DesiredSize.Height ?? 0 + padding.Top + padding.Bottom));
+            Brush brush = CreateFillBrush();
+
+            GuidelineSet guideLines = new GuidelineSet();
+            drawingContext.PushGuidelineSet(guideLines);
+            drawingContext.DrawGeometry(brush, pen, cg);
+        }
+        #endregion
+
+        #region 私有方法
+        //按Element的大小计算
+        private Geometry CreateGeometry(double x, double y)
+        {
+            #region 
+            PathFigure pf = new PathFigure();
+            pf.IsClosed = true;
+            pf.StartPoint = new Point(y / 2, 0);
+
+
+            LineSegment seg1 = new LineSegment() { Point = new Point(x - y / 2, 0) };
+            pf.Segments.Add(seg1);
+
+            ArcSegment seg2= new ArcSegment() { Size = new Size(y / 2, y / 2), SweepDirection = SweepDirection.Clockwise, Point = new Point(x - y / 2, y) };
+            pf.Segments.Add(seg2);
+
+            LineSegment seg3 = new LineSegment() { Point = new Point(y / 2, y) };
+            pf.Segments.Add(seg3);
+
+            ArcSegment seg4 = new ArcSegment() { Size = new Size(y / 2, y / 2), SweepDirection = SweepDirection.Clockwise, Point = new Point(y / 2, 0) };
+            pf.Segments.Add(seg4);           
+
+            PathGeometry g1 = new PathGeometry();
+            g1.Figures.Add(pf);
+            #endregion
+
+            return g1;
+        }
+        #endregion
+
+
+    }
+}