Fix recent editor API changes

code/IconBrowser.cs

@@ -1,4 +1,5 @@
 using Editor;
+using Sandbox;
 using System;
 using System.Collections.Generic;
 using System.IO;
@@ -44,7 +45,7 @@ private void SetupWindow()
 	{
 		MinimumSize = new Vector2( 192, 192 );
 
-		SetLayout( LayoutMode.TopToBottom );
+		this.SetLayout( LayoutMode.TopToBottom );
 
 		// Toolbar.
 		{
@@ -118,7 +119,7 @@ private static void OpenDumpIconDialog()
 			filePath += ".cs";
 
 		DumpIconsToCsFile( filePath );
-		Utility.OpenFileFolder( filePath );
+		EditorUtility.OpenFileFolder( filePath );
 	}
 
 	/// <summary>
@@ -201,9 +202,9 @@ private void IconContextMenu( object obj )
 
 		var menu = new Menu();
 
-		menu.AddOption( "Copy Name", null, () => Clipboard.Copy( iconData.Name ) );
-		menu.AddOption( "Copy C# Name", null, () => Clipboard.Copy( iconData.CsName ) );
-		menu.AddOption( "Copy S&&box Name", null, () => Clipboard.Copy( iconData.IconName ) );
+		menu.AddOption( "Copy Name", null, () => EditorUtility.Clipboard.Copy( iconData.Name ) );
+		menu.AddOption( "Copy C# Name", null, () => EditorUtility.Clipboard.Copy( iconData.CsName ) );
+		menu.AddOption( "Copy S&&box Name", null, () => EditorUtility.Clipboard.Copy( iconData.IconName ) );
 
 		menu.OpenAtCursor();
 	}

code/LayoutCompat/LayoutExtensions.cs

@@ -0,0 +1,21 @@
+namespace Editor;
+
+/// <summary>
+/// Contains extension methods for <see cref="Layout"/>.
+/// </summary>
+internal static class LayoutExtensions
+{
+	/// <summary>
+	/// Adds a child <see cref="Layout"/>.
+	/// </summary>
+	/// <param name="parentLayout">The parent <see cref="Layout"/> to add the newly created one to.</param>
+	/// <param name="layoutMode">The mode that the layout should use.</param>
+	/// <param name="stretch">The stretch value to pass to QT.</param>
+	/// <returns>The newly created <see cref="Layout"/>.</returns>
+	internal static Layout Add( this Layout parentLayout, LayoutMode layoutMode, int stretch = default )
+	{
+		var childLayout = layoutMode.CreateLayout();
+		parentLayout.Add( childLayout, stretch );
+		return childLayout;
+	}
+}

code/LayoutCompat/LayoutMode.cs

@@ -0,0 +1,12 @@
+namespace Editor;
+
+/// <summary>
+/// Defines a mode for a <see cref="Layout"/> to follow.
+/// </summary>
+internal enum LayoutMode : byte
+{
+	TopToBottom,
+	BottomToTop,
+	LeftToRight,
+	RightToLeft
+}

code/LayoutCompat/LayoutModeExtensions.cs

@@ -0,0 +1,24 @@
+using System;
+
+namespace Editor;
+
+/// <summary>
+/// Contains extension methods for <see cref="LayoutMode"/>.
+/// </summary>
+internal static class LayoutModeExtensions
+{
+	/// <summary>
+	/// Creates a new <see cref="Layout"/> based on the mode.
+	/// </summary>
+	/// <param name="layoutMode">The mode for the <see cref="Layout"/> to follow.</param>
+	/// <returns>The newly created <see cref="Layout"/>.</returns>
+	/// <exception cref="ArgumentException">Thrown when the <see cref="LayoutMode"/> provided is invalid.</exception>
+	internal static Layout CreateLayout( this LayoutMode layoutMode ) => layoutMode switch
+	{
+		LayoutMode.TopToBottom => Layout.Column(),
+		LayoutMode.BottomToTop => Layout.Column( true ),
+		LayoutMode.LeftToRight => Layout.Row(),
+		LayoutMode.RightToLeft => Layout.Row( true ),
+		_ => throw new ArgumentException( $"Unrecognized {nameof( LayoutMode )} \"{layoutMode}\"", nameof( layoutMode ) )
+	};
+}

code/LayoutCompat/WidgetExtensions.cs

@@ -0,0 +1,20 @@
+namespace Editor;
+
+/// <summary>
+/// Contains extension methods for <see cref="Widget"/>.
+/// </summary>
+internal static class WidgetExtensions
+{
+	/// <summary>
+	/// Sets the <see cref="Layout"/> of the <see cref="Widget"/>.
+	/// </summary>
+	/// <param name="widget">The <see cref="Widget"/> whose <see cref="Layout"/> to set.</param>
+	/// <param name="layoutMode">The mode to use on the <see cref="Layout"/>.</param>
+	/// <returns>The newly created <see cref="Layout"/>.</returns>
+	internal static Layout SetLayout( this Widget widget, LayoutMode layoutMode )
+	{
+		var layout = layoutMode.CreateLayout();
+		widget.Layout = layout;
+		return layout;
+	}
+}