avalonia: Tweaks to the public interface of ImageEditor

InABox.Avalonia/Components/ImageEditor/ImageEditor.axaml

@@ -183,7 +183,7 @@
 												<Slider Value="{Binding $parent[components:ImageEditor].LineThickness}"
 														Grid.Row="1"
 														Minimum="1.0"
-														Maximum="20.0"
+														Maximum="30.0"
 														Width="150"/>
 											</Grid>
 										</Border>

InABox.Avalonia/Components/ImageEditor/ImageEditor.axaml.cs

@@ -165,6 +165,12 @@ public partial class ImageEditor : UserControl
 
     #endregion
 
+    #region Events
+
+    public event EventHandler? Changed;
+
+    #endregion
+
     #region Private Properties
 
     public ObservableCollection<ImageEditorModeButton> ModeButtons { get; set; } = new();
@@ -260,6 +266,7 @@ public partial class ImageEditor : UserControl
         RedoStack.Push(Objects[^1]);
         Objects.RemoveAt(Objects.Count - 1);
         UpdateUndoRedoButtons();
+        Changed?.Invoke(this, new EventArgs());
     }
 
     [RelayCommand]
@@ -269,6 +276,7 @@ public partial class ImageEditor : UserControl
 
         Objects.Add(top);
         UpdateUndoRedoButtons();
+        Changed?.Invoke(this, new EventArgs());
     }
 
     private void AddObject(IImageEditorObject obj)
@@ -276,6 +284,7 @@ public partial class ImageEditor : UserControl
         Objects.Add(obj);
         RedoStack.Clear();
         UpdateUndoRedoButtons();
+        Changed?.Invoke(this, new EventArgs());
     }
 
     [RelayCommand]
@@ -410,9 +419,10 @@ public partial class ImageEditor : UserControl
         Objects.Clear();
         RedoStack.Clear();
         UpdateUndoRedoButtons();
+        Changed?.Invoke(this, new EventArgs());
     }
 
-    public Bitmap? GetImage()
+    public Bitmap GetImage()
     {
         var renderBitmap = new RenderTargetBitmap(new PixelSize(ImageWidth, ImageHeight));
         renderBitmap.Render(Image);
@@ -437,6 +447,15 @@ public partial class ImageEditor : UserControl
         return renderBitmap;
     }
 
+    public byte[] SaveImage()
+    {
+        var bitmap = GetImage();
+
+        var stream = new MemoryStream();
+        bitmap.Save(stream);
+        return stream.ToArray();
+    }
+
     #endregion
 
     #region Editing
@@ -503,14 +522,17 @@ public partial class ImageEditor : UserControl
             case PolylineObject polyline:
                 polyline.Points.Add(position);
                 polyline.Update();
+                Changed?.Invoke(this, new EventArgs());
                 break;
             case RectangleObject rectangle:
                 rectangle.Point2 = position;
                 rectangle.Update();
+                Changed?.Invoke(this, new EventArgs());
                 break;
             case EllipseObject ellipse:
                 ellipse.Point2 = position;
                 ellipse.Update();
+                Changed?.Invoke(this, new EventArgs());
                 break;
         }
     }
@@ -524,16 +546,19 @@ public partial class ImageEditor : UserControl
                 polyline.Points.Add(position);
                 polyline.Update();
                 CurrentObject = null;
+                Changed?.Invoke(this, new EventArgs());
                 break;
             case RectangleObject rectangle:
                 rectangle.Point2 = position;
                 rectangle.Update();
                 CurrentObject = null;
+                Changed?.Invoke(this, new EventArgs());
                 break;
             case EllipseObject ellipse:
                 ellipse.Point2 = position;
                 ellipse.Update();
                 CurrentObject = null;
+                Changed?.Invoke(this, new EventArgs());
                 break;
         }