Merge branch 'honzapatCZ-elementContainers' into 1.1

Source/Editor/CustomEditors/Elements/Container/VerticalPanelElement.cs

@@ -0,0 +1,21 @@
+// Copyright (c) 2012-2021 Wojciech Figat. All rights reserved.
+
+using FlaxEngine.GUI;
+
+namespace FlaxEditor.CustomEditors.Elements
+{
+    /// <summary>
+    /// The horizontal panel element.
+    /// </summary>
+    /// <seealso cref="FlaxEditor.CustomEditors.LayoutElement" />
+    public class HorizontalPanelElement : LayoutElementsContainer
+    {
+        /// <summary>
+        /// The panel.
+        /// </summary>
+        public readonly HorizontalPanel Panel = new HorizontalPanel();
+
+        /// <inheritdoc />
+        public override ContainerControl ContainerControl => Panel;
+    }
+}

Source/Editor/CustomEditors/LayoutElementsContainer.cs

@@ -102,6 +102,28 @@ namespace FlaxEditor.CustomEditors
             Editor.Instance.ProjectCache.SetCollapsedGroup(panel.HeaderText, panel.IsClosed);
         }
 
+        /// <summary>
+        /// Adds new horizontal panel element.
+        /// </summary>
+        /// <returns>The created element.</returns>
+        public HorizontalPanelElement HorizontalPanel()
+        {
+            var element = new HorizontalPanelElement();
+            OnAddElement(element);
+            return element;
+        }
+        
+        /// <summary>
+        /// Adds new horizontal panel element.
+        /// </summary>
+        /// <returns>The created element.</returns>
+        public VerticalPanelElement VerticalPanel()
+        {
+            var element = new VerticalPanelElement();
+            OnAddElement(element);
+            return element;
+        }
+
         /// <summary>
         /// Adds new button element.
         /// </summary>