Allow users to choose what type of widget they want to create.

Source/Editor/Content/Create/PrefabCreateEntry.cs

@@ -3,12 +3,13 @@
 using System;
 using FlaxEditor.Scripting;
 using FlaxEngine;
+using FlaxEngine.GUI;
 using Object = FlaxEngine.Object;
 
 namespace FlaxEditor.Content.Create
 {
     /// <summary>
-    /// Visual Script asset creating handler. Allows to specify base class to inherit from.
+    /// Prefab asset creating handler. Allows to specify base actor to use as the root.
     /// </summary>
     /// <seealso cref="FlaxEditor.Content.Create.CreateFileEntry" />
     public class PrefabCreateEntry : CreateFileEntry
@@ -69,4 +70,112 @@ namespace FlaxEditor.Content.Create
             return PrefabManager.CreatePrefab(actor, ResultUrl, true);
         }
     }
+
+    /// <summary>
+    /// Widget asset creating handler. Allows to specify base UIControl to use as the root.
+    /// </summary>
+    /// <seealso cref="FlaxEditor.Content.Create.CreateFileEntry" />
+    public class WidgetCreateEntry : CreateFileEntry
+    {
+        /// <summary>
+        /// The create options.
+        /// </summary>
+        public class Options
+        {
+            /// <summary>
+            /// Which mode is used to initialize this widget.
+            /// </summary>
+            public enum WidgetMode
+            {
+                /// <summary>
+                /// Initialize the widget with a UICanvas.
+                /// </summary>
+                Canvas,
+
+                /// <summary>
+                /// Initialize the widget with a UIControl.
+                /// </summary>
+                Control
+            }
+
+            /// <summary>
+            /// The mode used to initialize the widget.
+            /// </summary>
+            [Tooltip("Whether to initialize the widget with a canvas or a control.")]
+            public WidgetMode WidgetInitializationMode = WidgetMode.Canvas;
+
+            bool ShowRoot => WidgetInitializationMode == WidgetMode.Control;
+
+            /// <summary>
+            /// The root control.
+            /// </summary>
+            [TypeReference(typeof(Control), nameof(IsValid))]
+            [Tooltip("The control type of the root of the new Widget's root control."), VisibleIf(nameof(ShowRoot))]
+            public Type RootControlType = typeof(Panel);
+
+            private static bool IsValid(Type type)
+            {
+                return (type.IsPublic || type.IsNestedPublic) && !type.IsAbstract && !type.IsGenericType;
+            }
+        }
+
+        private readonly Options _options = new Options();
+
+        /// <inheritdoc />
+        public override object Settings => _options;
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="WidgetCreateEntry"/> class.
+        /// </summary>
+        /// <param name="resultUrl">The result file url.</param>
+        public WidgetCreateEntry(string resultUrl)
+        : base("Settings", resultUrl)
+        {
+        }
+
+        /// <inheritdoc />
+        public override bool Create()
+        {
+            Actor actor = null;
+
+            if (_options.WidgetInitializationMode == Options.WidgetMode.Control)
+            {
+                if (_options.RootControlType == null)
+                    _options.RootControlType = typeof(Control);
+
+                ScriptType controlType = new ScriptType(_options.RootControlType);
+
+                Control control = null;
+                try
+                {
+                    control = controlType.CreateInstance() as Control;
+                }
+                catch (Exception ex)
+                {
+                    Editor.LogError("Failed to create widget with root control type: " + controlType.Name);
+                    Editor.LogWarning(ex);
+                    return true;
+                }
+
+                UIControl newControl = new UIControl();
+                newControl.Control = control;
+
+                actor = newControl;
+            }
+            else if (_options.WidgetInitializationMode == Options.WidgetMode.Canvas)
+            {
+                actor = new UICanvas();
+            }
+
+            if (actor == null)
+            {
+                Editor.LogError("Failed to create widget. Final actor was null.");
+                return true;
+            }
+
+            Object.Destroy(actor, 20.0f);
+
+            return PrefabManager.CreatePrefab(actor, ResultUrl, true);
+        }
+    }
 }

Source/Editor/Content/Proxy/PrefabProxy.cs

@@ -233,18 +233,8 @@ namespace FlaxEditor.Content
         /// <inheritdoc />
         public override void Create(string outputPath, object arg)
         {
-            // Create prefab with UI Control
-            var actor = new UIControl
-            {
-                Name = Path.GetFileNameWithoutExtension(outputPath),
-                StaticFlags = StaticFlags.None,
-            };
-            actor.Control = new Button
-            {
-                Text = "Button",
-            };
-            PrefabManager.CreatePrefab(actor, outputPath, false);
-            Object.Destroy(actor, 20.0f);
+            Editor.Instance.ContentImporting.Create(new WidgetCreateEntry(outputPath));
+            return;
         }
     }
 }