From 33adcf1a75398c44a7cee61826a6186c5a110574 Mon Sep 17 00:00:00 2001
From: lifuhua123 <625851617@qq.com>
Date: Wed, 8 Mar 2023 23:05:19 +0800
Subject: [PATCH] update in ElementAdorner

1) Fix the defect that the control disappears after the ElementAdorner control is rotated.
2) Fix ElementAdorner control dragging boundary.
---
 .../Controls/ElementAdorner/ElementAdorner.cs | 47 ++++++++++++++++++-
 1 file changed, 45 insertions(+), 2 deletions(-)

diff --git a/src/WPFDevelopers.Shared/Controls/ElementAdorner/ElementAdorner.cs b/src/WPFDevelopers.Shared/Controls/ElementAdorner/ElementAdorner.cs
index 1ee4b8b5..05ae153f 100644
--- a/src/WPFDevelopers.Shared/Controls/ElementAdorner/ElementAdorner.cs
+++ b/src/WPFDevelopers.Shared/Controls/ElementAdorner/ElementAdorner.cs
@@ -67,8 +67,24 @@ private Thumb CreateMoveThumb()
                 var element = AdornedElement as FrameworkElement;
                 if (element == null)
                     return;
-                Canvas.SetLeft(element, Canvas.GetLeft(element) + e.HorizontalChange);
-                Canvas.SetTop(element, Canvas.GetTop(element) + e.VerticalChange);
+
+                var transform = element.RenderTransform;
+                if (transform != null)
+                {
+                    if (transform as RotateTransform != null)
+                    {
+                        var rotateTransform = transform as RotateTransform;
+
+                        Point ptChange = rotateTransform.Transform(new Point(e.HorizontalChange, e.VerticalChange));
+
+                        SetPositon(element, Canvas.GetLeft(element) + ptChange.X, Canvas.GetTop(element) + ptChange.Y);
+                    }
+                    else
+                    {
+                        SetPositon(element, Canvas.GetLeft(element) + e.HorizontalChange, Canvas.GetTop(element) + e.VerticalChange);
+                    }
+                }
+               
             };
             return thumb;
         }
@@ -160,5 +176,32 @@ protected override Visual GetVisualChild(int index)
         {
             return visualCollection[index];
         }
+
+        private void SetPositon(FrameworkElement element,double left, double top)
+        {
+            var parent = VisualTreeHelper.GetParent(element) as Canvas;
+
+            if (left <= 0)
+            {
+                left = 0;
+            }
+
+            if (top <= 0)
+            {
+                top = 0;
+            }
+
+            if (left + element.Width > parent.ActualWidth)
+            {
+                left = parent.ActualWidth - element.Width;
+            }
+            if (top + element.Height > parent.ActualHeight)
+            {
+                top = parent.ActualHeight - element.Height;
+            }
+
+            Canvas.SetLeft(element, left);
+            Canvas.SetTop(element, top);
+        }
     }
 }
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