Add project files.

Examples/Nodify.Shapes/Canvas/UndoRedo/MoveShapesAction.cs

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+using Nodify.UndoRedo;
+using System.Collections.Generic;
+using System.Windows;
+
+namespace Nodify.Shapes.Canvas.UndoRedo
+{
+    public class MoveShapesAction : IAction
+    {
+        private readonly IReadOnlyCollection<ShapeViewModel> _shapes;
+        private readonly Vector _offset;
+
+        public string? Label => "Move shapes";
+
+        public MoveShapesAction(IReadOnlyCollection<ShapeViewModel> shapes, Vector offset)
+        {
+            _shapes = shapes;
+            _offset = offset;
+        }
+
+        public void Execute()
+            => ApplyOffset(_offset);
+
+        public void Undo()
+            => ApplyOffset(-_offset);
+
+        private void ApplyOffset(Vector offset)
+        {
+            foreach (var shape in _shapes)
+            {
+                shape.Location += offset;
+            }
+        }
+    }
+}

Examples/Nodify.Shapes/Canvas/UndoRedo/ResizeShapesAction.cs

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+using System.Collections.Generic;
+using System.Linq;
+using System.Windows;
+using Nodify.UndoRedo;
+
+namespace Nodify.Shapes.Canvas.UndoRedo
+{
+    public class ResizeShapesAction : IAction
+    {
+        private readonly IReadOnlyCollection<ShapeViewModel> _resizedShapes;
+        private readonly Dictionary<ShapeViewModel, Size> _initialSizes;
+        private Dictionary<ShapeViewModel, Size>? _finalSizes;
+        private readonly Dictionary<ShapeViewModel, Point> _initialLocations;
+        private Dictionary<ShapeViewModel, Point>? _finalLocations;
+
+        public ResizeShapesAction(CanvasViewModel canvas)
+        {
+            _resizedShapes = canvas.SelectedShapes;
+            _initialSizes = _resizedShapes.ToDictionary(x => x, x => new Size(x.Width, x.Height));
+            _initialLocations = _resizedShapes.ToDictionary(x => x, x => x.Location);
+        }
+
+        public string? Label => "Resize shapes";
+
+        public void Execute()
+        {
+            _finalLocations?.ForEach(x => x.Key.Location = x.Value);
+
+            _finalSizes?.ForEach(x =>
+            {
+                x.Key.Width = x.Value.Width;
+                x.Key.Height = x.Value.Height;
+            });
+        }
+
+        public void Undo()
+        {
+            _initialSizes.ForEach(x =>
+            {
+                x.Key.Width = x.Value.Width;
+                x.Key.Height = x.Value.Height;
+            });
+
+            _initialLocations.ForEach(x => x.Key.Location = x.Value);
+        }
+
+        public void SaveSizes()
+        {
+            _finalLocations = _resizedShapes.ToDictionary(x => x, x => x.Location);
+            _finalSizes = _resizedShapes.ToDictionary(x => x, x => new Size(x.Width, x.Height));
+        }
+    }
+}

Examples/Nodify.Shapes/Canvas/UndoRedo/SelectShapesAction.cs

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+using Nodify.UndoRedo;
+using System.Collections.Generic;
+
+namespace Nodify.Shapes.Canvas.UndoRedo
+{
+    public class SelectShapesAction : IAction
+    {
+        public string? Label => "Select shapes";
+
+        private readonly IReadOnlyCollection<ShapeViewModel> _nodes;
+        private readonly CanvasViewModel _canvas;
+
+        public SelectShapesAction(IReadOnlyCollection<ShapeViewModel> nodes, CanvasViewModel canvas)
+        {
+            _nodes = nodes;
+            _canvas = canvas;
+        }
+
+        public void Execute()
+        {
+            _canvas.SelectedShapes.AddRange(_nodes);
+        }
+
+        public void Undo()
+        {
+            _canvas.SelectedShapes.RemoveRange(_nodes);
+        }
+
+        public override string? ToString()
+            => Label;
+    }
+
+    public class DeselectShapesAction : IAction
+    {
+        public string? Label => "Deselect shapes";
+
+        private readonly IReadOnlyCollection<ShapeViewModel> _nodes;
+        private readonly CanvasViewModel _canvas;
+
+        public DeselectShapesAction(IReadOnlyCollection<ShapeViewModel> nodes, CanvasViewModel canvas)
+        {
+            _nodes = nodes;
+            _canvas = canvas;
+        }
+
+        public void Execute()
+        {
+            _canvas.SelectedShapes.RemoveRange(_nodes);
+        }
+
+        public void Undo()
+        {
+            _canvas.SelectedShapes.AddRange(_nodes);
+        }
+
+        public override string? ToString()
+            => Label;
+    }
+}