Added DevToolsOptions.

With options to:

- Set the key gesture
- Show as child window
- Set the initial size

Co-Authored-By: workgroupengineering <workgroupengineering@users.noreply.github.com>

src/Avalonia.Diagnostics/DevToolsExtensions.cs

@@ -15,7 +15,7 @@ namespace Avalonia
         /// <param name="root">The window to attach DevTools to.</param>
         public static void AttachDevTools(this TopLevel root)
         {
-            DevTools.Attach(root, new KeyGesture(Key.F12));
+            DevTools.Attach(root, new DevToolsOptions());
         }
 
         /// <summary>
@@ -27,5 +27,15 @@ namespace Avalonia
         {
             DevTools.Attach(root, gesture);
         }
+
+        /// <summary>
+        /// Attaches DevTools to a window, to be opened with the specified options.
+        /// </summary>
+        /// <param name="root">The window to attach DevTools to.</param>
+        /// <param name="options">additional settint of DevTools</param>
+        public static void AttachDevTools(this TopLevel root, DevToolsOptions options)
+        {
+            DevTools.Attach(root, options);
+        }
     }
 }

src/Avalonia.Diagnostics/Diagnostics/DevTools.cs

@@ -6,6 +6,8 @@ using Avalonia.Diagnostics.Views;
 using Avalonia.Input;
 using Avalonia.Interactivity;
 
+#nullable enable 
+
 namespace Avalonia.Diagnostics
 {
     public static class DevTools
@@ -13,12 +15,20 @@ namespace Avalonia.Diagnostics
         private static readonly Dictionary<TopLevel, Window> s_open = new Dictionary<TopLevel, Window>();
 
         public static IDisposable Attach(TopLevel root, KeyGesture gesture)
+        {
+            return Attach(root, new DevToolsOptions()
+            {
+                Gesture = gesture,
+            });
+        }
+
+        public static IDisposable Attach(TopLevel root, DevToolsOptions options)
         {
             void PreviewKeyDown(object sender, KeyEventArgs e)
             {
-                if (gesture.Matches(e))
+                if (options.Gesture.Matches(e))
                 {
-                    Open(root);
+                    Open(root, options);
                 }
             }
 
@@ -28,7 +38,9 @@ namespace Avalonia.Diagnostics
                 RoutingStrategies.Tunnel);
         }
 
-        public static IDisposable Open(TopLevel root)
+        public static IDisposable Open(TopLevel root) => Open(root, new DevToolsOptions());
+
+        public static IDisposable Open(TopLevel root, DevToolsOptions options)
         {
             if (s_open.TryGetValue(root, out var window))
             {
@@ -38,15 +50,15 @@ namespace Avalonia.Diagnostics
             {
                 window = new MainWindow
                 {
-                    Width = 1024,
-                    Height = 512,
                     Root = root,
+                    Width = options.Size.Width,
+                    Height = options.Size.Height,
                 };
 
                 window.Closed += DevToolsClosed;
                 s_open.Add(root, window);
 
-                if (root is Window inspectedWindow)
+                if (options.ShowAsChildWindow && root is Window inspectedWindow)
                 {
                     window.Show(inspectedWindow);
                 }

src/Avalonia.Diagnostics/Diagnostics/DevToolsOptions.cs

@@ -0,0 +1,26 @@
+using Avalonia.Input;
+
+namespace Avalonia.Diagnostics
+{
+    /// <summary>
+    /// Describes options used to customize DevTools.
+    /// </summary>
+    public class DevToolsOptions
+    {
+        /// <summary>
+        /// Gets or sets the key gesture used to open DevTools.
+        /// </summary>
+        public KeyGesture Gesture { get; set; } = new KeyGesture(Key.F12);
+
+        /// <summary>
+        /// Gets or sets a value indicating whether DevTools should be displayed as a child window
+        /// of the window being inspected. The default value is true.
+        /// </summary>
+        public bool ShowAsChildWindow { get; set; } = true;
+
+        /// <summary>
+        /// Gets or sets the initial size of the DevTools window. The default value is 1024x512.
+        /// </summary>
+        public Size Size { get; set; } = new Size(1024, 512);
+    }
+}