From f8270e6408aa80728035c5dc1fdd1d7f38edbf7b Mon Sep 17 00:00:00 2001
From: Trivalik <3148279+trivalik@users.noreply.github.com>
Date: Mon, 2 Dec 2024 15:10:18 +0100
Subject: [PATCH] allow assign graphControl.Graph = null and reassign graph

---
 .../WpfGraphControl/AutomaticGraphLayoutControl.xaml.cs     | 6 +-----
 GraphLayout/tools/WpfGraphControl/GraphViewer.cs            | 5 ++++-
 2 files changed, 5 insertions(+), 6 deletions(-)

diff --git a/GraphLayout/tools/WpfGraphControl/AutomaticGraphLayoutControl.xaml.cs b/GraphLayout/tools/WpfGraphControl/AutomaticGraphLayoutControl.xaml.cs
index 0445d7a1..c26cefe7 100644
--- a/GraphLayout/tools/WpfGraphControl/AutomaticGraphLayoutControl.xaml.cs
+++ b/GraphLayout/tools/WpfGraphControl/AutomaticGraphLayoutControl.xaml.cs
@@ -15,12 +15,8 @@ public Graph Graph {
         public static readonly DependencyProperty GraphProperty =
             DependencyProperty.Register("Graph", typeof(Graph), typeof(AutomaticGraphLayoutControl), new PropertyMetadata(default(Graph),
                 (d,e)=> ((AutomaticGraphLayoutControl)d)?.SetGraph()));
-     
+
         private void SetGraph() {
-            if (Graph == null) {
-                dockPanel.Children.Clear();
-                return;
-            }
             if (_graphViewer == null) {
                 _graphViewer = new GraphViewer();
                 _graphViewer.BindToPanel(dockPanel);
diff --git a/GraphLayout/tools/WpfGraphControl/GraphViewer.cs b/GraphLayout/tools/WpfGraphControl/GraphViewer.cs
index 31b8aaf0..ad72471d 100644
--- a/GraphLayout/tools/WpfGraphControl/GraphViewer.cs
+++ b/GraphLayout/tools/WpfGraphControl/GraphViewer.cs
@@ -746,7 +746,10 @@ void ProcessGraphUnderLock() {
 
                 CancelToken = new CancelToken();
 
-                if (_drawingGraph == null) return;
+                if (_drawingGraph == null) {
+                    ClearGraphViewer();
+                    return;
+                }
 
                 HideCanvas();
                 ClearGraphViewer();