From d3f6791b53759250f4ff20b8577ccffa94e83bf7 Mon Sep 17 00:00:00 2001
From: AJ <ajisaacs27@gmail.com>
Date: Tue, 12 Oct 2021 20:51:40 -0400
Subject: [PATCH] UpdatePrefix()

---
 ExportDXF/Forms/MainForm.cs | 38 ++++++++++++++++++++++++++++---------
 1 file changed, 29 insertions(+), 9 deletions(-)

diff --git a/ExportDXF/Forms/MainForm.cs b/ExportDXF/Forms/MainForm.cs
index 6bd6893..b174779 100644
--- a/ExportDXF/Forms/MainForm.cs
+++ b/ExportDXF/Forms/MainForm.cs
@@ -166,17 +166,11 @@ namespace ExportDXF.Forms
 
         private int SldWorks_ActiveModelDocChangeNotify()
         {
-            if (InvokeRequired)
-            {
-                Invoke(new MethodInvoker(() =>
-                {
-                    SetActiveDocName();
-                }));
-            }
-            else
+            Invoke(new MethodInvoker(() =>
             {
                 SetActiveDocName();
-            }
+                UpdatePrefix();
+            }));
 
             return 1;
         }
@@ -612,5 +606,31 @@ namespace ExportDXF.Forms
                 prefixTextBox.Text = string.Empty;
             }
         }
+
+        private void UpdatePrefix()
+        {
+            var model = sldWorks.ActiveDoc as ModelDoc2;
+
+            if (model == null)
+                return;
+
+            var isDrawing = model is DrawingDoc;
+            var title = model.GetTitle();
+
+            if (isDrawing)
+            {
+                var drawingInfo = DrawingInfo.Parse(title);
+
+                if (drawingInfo == null)
+                    return;
+
+                prefixTextBox.Text = $"{drawingInfo.JobNo} {drawingInfo.DrawingNo} PT";
+                prefixTextBox.SelectionStart = prefixTextBox.Text.Length;
+            }
+            else
+            {
+                prefixTextBox.Text = string.Empty;
+            }
+        }
     }
 }
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