From 9d4961af8647202c0aa1fd34017e61231501be5a Mon Sep 17 00:00:00 2001
From: Ano-sys <timo.niemann02@gmail.com>
Date: Sun, 23 Mar 2025 00:24:19 +0100
Subject: [PATCH] Added Undo and Redo

---
 ViewModels/MainWindowViewModel.cs | 25 ++++++++++++++++++++++++-
 1 file changed, 24 insertions(+), 1 deletion(-)

diff --git a/ViewModels/MainWindowViewModel.cs b/ViewModels/MainWindowViewModel.cs
index d46931a..4140ca8 100644
--- a/ViewModels/MainWindowViewModel.cs
+++ b/ViewModels/MainWindowViewModel.cs
@@ -84,7 +84,8 @@ public class MainWindowViewModel : ViewModelBase
     private void OnCanvasPointerPressed(PointerPressedEventArgs? e)
     {
         if (e == null) return;
-        
+        if(UndoDrawingPoints.Count > 0) UndoDrawingPoints.Clear();
+
         IsDrawing = true;
         DrawingPoints.Add(new DrawingPoints(Brush, BrushThickness));
         DrawingPoint = DrawingPoints[^1];
@@ -111,4 +112,26 @@ public class MainWindowViewModel : ViewModelBase
     {
         IsDrawing = false;
     }
+
+    public void GlobalKeyUpHandler(KeyEventArgs e)
+    {
+        if (e.KeyModifiers != KeyModifiers.Control) return;
+        switch (e.Key)
+        {
+            case Key.Z:
+                if (DrawingPoints.Count > 0)
+                {
+                    UndoDrawingPoints.Add(DrawingPoints[^1]);
+                    DrawingPoints.Remove(DrawingPoints[^1]);
+                }
+                break;
+            case Key.Y:
+                if (UndoDrawingPoints.Count > 0)
+                {
+                    DrawingPoints.Add(UndoDrawingPoints[^1]);
+                    UndoDrawingPoints.Remove(UndoDrawingPoints[^1]);
+                }
+                break;
+        }
+    }
 }