Optimize UI in Editor

Source/Editor/GUI/Docking/DockPanelProxy.cs

@@ -42,7 +42,7 @@ namespace FlaxEditor.GUI.Docking
         /// <summary>
         /// The mouse position.
         /// </summary>
-        public Vector2 MousePosition;
+        public Vector2 MousePosition = Vector2.Minimum;
 
         /// <summary>
         /// The start drag asynchronous window.
@@ -192,7 +192,7 @@ namespace FlaxEditor.GUI.Docking
                 var tab = _panel.GetTab(0);
 
                 // Draw header
-                bool isMouseOver = IsMouseOver && headerRect.Contains(MousePosition);
+                bool isMouseOver = headerRect.Contains(MousePosition);
                 Render2D.FillRectangle(headerRect, containsFocus ? style.BackgroundSelected : isMouseOver ? style.BackgroundHighlighted : style.LightBackground);
 
                 float iconWidth = tab.Icon.IsValid ? DockPanel.DefaultButtonsSize + DockPanel.DefaultLeftTextMargin : 0;
@@ -238,7 +238,7 @@ namespace FlaxEditor.GUI.Docking
                     var iconWidth = tab.Icon.IsValid ? DockPanel.DefaultButtonsSize + DockPanel.DefaultLeftTextMargin : 0;
                     var width = titleSize.X + DockPanel.DefaultButtonsSize + 2 * DockPanel.DefaultButtonsMargin + DockPanel.DefaultLeftTextMargin + DockPanel.DefaultRightTextMargin + iconWidth;
                     var tabRect = new Rectangle(x, 0, width, DockPanel.DefaultHeaderHeight);
-                    var isMouseOver = IsMouseOver && tabRect.Contains(MousePosition);
+                    var isMouseOver = tabRect.Contains(MousePosition);
                     var isSelected = _panel.SelectedTab == tab;
 
                     // Check if tab is selected
@@ -294,11 +294,11 @@ namespace FlaxEditor.GUI.Docking
         /// <inheritdoc />
         public override void OnLostFocus()
         {
-            // Clear
             IsMouseLeftButtonDown = false;
             IsMouseRightButtonDown = false;
             IsMouseMiddleButtonDown = false;
             MouseDownWindow = null;
+            MousePosition = Vector2.Minimum;
 
             base.OnLostFocus();
         }
@@ -306,7 +306,6 @@ namespace FlaxEditor.GUI.Docking
         /// <inheritdoc />
         public override void OnMouseEnter(Vector2 location)
         {
-            // Cache mouse
             MousePosition = location;
 
             base.OnMouseEnter(location);
@@ -403,10 +402,7 @@ namespace FlaxEditor.GUI.Docking
         /// <inheritdoc />
         public override void OnMouseMove(Vector2 location)
         {
-            // Cache mouse
             MousePosition = location;
-
-            // Check if mouse is down
             if (IsMouseLeftButtonDown)
             {
                 // Check if mouse is outside the header
@@ -453,10 +449,8 @@ namespace FlaxEditor.GUI.Docking
         /// <inheritdoc />
         public override void OnMouseLeave()
         {
-            // Check if mouse is down
             if (IsMouseLeftButtonDown)
             {
-                // Clear flag
                 IsMouseLeftButtonDown = false;
 
                 // Check tabs under mouse position
@@ -466,6 +460,7 @@ namespace FlaxEditor.GUI.Docking
             }
             IsMouseRightButtonDown = false;
             IsMouseMiddleButtonDown = false;
+            MousePosition = Vector2.Minimum;
 
             base.OnMouseLeave();
         }

Source/Editor/GUI/Tree/TreeNode.cs

@@ -889,19 +889,16 @@ namespace FlaxEditor.GUI.Tree
         /// <inheritdoc />
         public override void OnChildResized(Control control)
         {
+            // Optimize if child is tree node that is not visible
+            if (!_opened && control is TreeNode)
+                return;
+
             PerformLayout();
             ParentTree.UpdateSize();
+
             base.OnChildResized(control);
         }
 
-        /// <inheritdoc />
-        public override void OnParentResized()
-        {
-            base.OnParentResized();
-
-            Width = Parent.Width;
-        }
-
         /// <inheritdoc />
         public override DragDropEffect OnDragEnter(ref Vector2 location, DragData data)
         {
@@ -1018,56 +1015,82 @@ namespace FlaxEditor.GUI.Tree
         /// <inheritdoc />
         public override void PerformLayout(bool force = false)
         {
-            // Check if update is locked
+            if (_isLayoutLocked && !force)
-            if (IsLayoutLocked && !force)
                 return;
 
-            // Update the nodes nesting level before the actual positioning
+            bool wasLocked = _isLayoutLocked;
-            float xOffset = _xOffset + ChildrenIndent;
+            if (!wasLocked)
-            for (int i = 0; i < _children.Count; i++)
+                LockChildrenRecursive();
+
+            // Optimize layout logic if node is collapsed
+            if (_opened || _animationProgress < 1.0f)
             {
-                if (_children[i] is TreeNode node && node.Visible)
+                PerformLayoutBeforeChildren();
-                    node._xOffset = xOffset;
+                for (int i = 0; i < _children.Count; i++)
+                    _children[i].PerformLayout(true);
+                PerformLayoutAfterChildren();
+            }
+            else
+            {
+                // TODO: perform layout for any non-TreeNode controls
+                _cachedHeight = _headerHeight;
+                _cachedTextColor = CacheTextColor();
+                Size = new Vector2(Parent?.Width ?? Width, _headerHeight);
             }
 
-            base.PerformLayout(force);
+            if (!wasLocked)
+                UnlockChildrenRecursive();
+        }
+
+        /// <inheritdoc />
+        protected override void PerformLayoutBeforeChildren()
+        {
+            if (_opened)
+            {
+                // Update the nodes nesting level before the actual positioning
+                float xOffset = _xOffset + ChildrenIndent;
+                for (int i = 0; i < _children.Count; i++)
+                {
+                    if (_children[i] is TreeNode node)
+                        node._xOffset = xOffset;
+                }
+            }
+
+            base.PerformLayoutBeforeChildren();
         }
 
         /// <inheritdoc />
         protected override void PerformLayoutAfterChildren()
         {
-            _cachedTextColor = CacheTextColor();
-
-            // Prepare
             float y = _headerHeight;
             float height = _headerHeight;
             float xOffset = _xOffset + ChildrenIndent;
-            y -= _cachedHeight * (_opened ? 1.0f - _animationProgress : _animationProgress);
 
-            // Arrange children
+            // Skip full layout if it's fully collapsed
-            for (int i = 0; i < _children.Count; i++)
+            if (_opened || _animationProgress < 1.0f)
             {
-                if (_children[i] is TreeNode node && node.Visible)
+                y -= _cachedHeight * (_opened ? 1.0f - _animationProgress : _animationProgress);
+
+                // Arrange children
+                for (int i = 0; i < _children.Count; i++)
                 {
-                    node._xOffset = xOffset;
+                    if (_children[i] is TreeNode node && node.Visible)
-                    node.Location = new Vector2(0, y);
+                    {
-                    float nodeHeight = node.Height + DefaultNodeOffsetY;
+                        node._xOffset = xOffset;
-                    y += nodeHeight;
+                        node.Location = new Vector2(0, y);
-                    height += nodeHeight;
+                        float nodeHeight = node.Height + DefaultNodeOffsetY;
+                        y += nodeHeight;
+                        height += nodeHeight;
+                    }
                 }
             }
 
-            // Cache calculated height
+            // Cache data
             _cachedHeight = height;
+            _cachedTextColor = CacheTextColor();
 
-            // Force to be closed
+            // Set bounds
-            if (_animationProgress >= 1.0f && !_opened)
+            Size = new Vector2(Parent?.Width ?? Width, Mathf.Max(_headerHeight, y));
-            {
-                y = _headerHeight;
-            }
-
-            // Set height
-            Height = Mathf.Max(_headerHeight, y);
         }
 
         /// <inheritdoc />

Source/Editor/Modules/SceneModule.cs

@@ -486,7 +486,6 @@ namespace FlaxEditor.Modules
             var node = SceneGraphFactory.BuildActorNode(actor);
             if (node != null)
             {
-                node.TreeNode.UnlockChildrenRecursive();
                 node.ParentNode = parentNode;
             }
         }
@@ -544,13 +543,8 @@ namespace FlaxEditor.Modules
                 return;
 
             // Get the new parent node (may be missing)
-            if (parentNode != null)
+            node.ParentNode = parentNode;
-            {
+            if (parentNode == null)
-                // Change parent
-                node.TreeNode.UnlockChildrenRecursive();
-                node.ParentNode = parentNode;
-            }
-            else
             {
                 // Check if actor is selected in editor
                 if (Editor.SceneEditing.Selection.Contains(node))

Source/Editor/SceneGraph/ActorNode.cs

@@ -14,7 +14,7 @@ namespace FlaxEditor.SceneGraph
     /// It's part of the Scene Graph.
     /// </summary>
     /// <seealso cref="SceneGraphNode" />
-    /// <seealso cref="Actor" />
+    /// <seealso cref="FlaxEngine.Actor" />
     [HideInEditor]
     public class ActorNode : SceneGraphNode
     {
@@ -228,6 +228,7 @@ namespace FlaxEditor.SceneGraph
             set => _actor.Transform = value;
         }
 
+#if false
         /// <inheritdoc />
         public override SceneGraphNode ParentNode
         {
@@ -238,6 +239,7 @@ namespace FlaxEditor.SceneGraph
                 base.ParentNode = value;
             }
         }
+#endif
 
         /// <inheritdoc />
         public override object EditableObject => _actor;
@@ -250,7 +252,7 @@ namespace FlaxEditor.SceneGraph
             // Skip actors that should not be selected
             if (hit != null && _actor != null && (_actor.HideFlags & HideFlags.DontSelect) == HideFlags.DontSelect)
             {
-                hit = ParentNode;
+                hit = parentNode;
             }
 
             return hit;
@@ -306,22 +308,43 @@ namespace FlaxEditor.SceneGraph
         /// <inheritdoc />
         protected override void OnParentChanged()
         {
-            // Update UI node connections
-            _treeNode.Parent = (ParentNode as ActorNode)?.TreeNode;
-
-            // Check if it's a new node and parent has been already ready
-            // (eg. we build new node for spawned actor and link it to the game)
-            if (_treeNode.Parent != null && !_treeNode.Parent.IsLayoutLocked)
-            {
-                _treeNode.IndexInParent = _actor.OrderInParent;
-                _treeNode.Parent.SortChildren();
-
-                // Update UI
-                _treeNode.IsLayoutLocked = false;
-                _treeNode.PerformLayout();
-            }
-
             base.OnParentChanged();
+
+            // Update UI (special case if actor is spawned and added to existing scene tree)
+            var parentTreeNode = (parentNode as ActorNode)?.TreeNode;
+            if (parentTreeNode != null && !parentTreeNode.IsLayoutLocked)
+            {
+                parentTreeNode.IsLayoutLocked = true;
+                _treeNode.Parent = parentTreeNode;
+                _treeNode.IndexInParent = _actor.OrderInParent;
+                parentTreeNode.IsLayoutLocked = false;
+
+                // Skip UI update if node won't be in a view
+                if (parentTreeNode.IsCollapsed)
+                {
+                    TreeNode.UnlockChildrenRecursive();
+                }
+                else
+                {
+                    // Try to perform layout at the level where it makes it the most performant (the least computations)
+                    var tree = parentTreeNode.ParentTree;
+                    if (tree != null)
+                    {
+                        if (tree.Parent is FlaxEngine.GUI.Panel treeParent)
+                            treeParent.PerformLayout();
+                        else
+                            tree.PerformLayout();
+                    }
+                    else
+                    {
+                        parentTreeNode.PerformLayout();
+                    }
+                }
+            }
+            else
+            {
+                _treeNode.Parent = parentTreeNode;
+            }
         }
 
         /// <inheritdoc />

Source/Engine/Core/Math/Math.h

@@ -489,7 +489,7 @@ namespace Math
     static bool NearEqual(float a, float b)
     {
         // Check if the numbers are really close - needed when comparing numbers near zero
-        if (Abs(a) < ZeroTolerance)
+        if (Abs(a - b) < ZeroTolerance)
             return true;
 
         // Original from Bruce Dawson: http://randomascii.wordpress.com/2012/02/25/comparing-floating-point-numbers-2012-edition/

Source/Engine/Core/Math/Vector2.cs

@@ -1816,7 +1816,7 @@ namespace FlaxEngine
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public static bool operator ==(Vector2 left, Vector2 right)
         {
-            return left.Equals(ref right);
+            return Mathf.NearEqual(left.X, left.X) && Mathf.NearEqual(left.Y, right.Y);
         }
 
         /// <summary>
@@ -1831,7 +1831,7 @@ namespace FlaxEngine
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public static bool operator !=(Vector2 left, Vector2 right)
         {
-            return !left.Equals(ref right);
+            return !Mathf.NearEqual(left.X, left.X) || !Mathf.NearEqual(left.Y, right.Y);
         }
 
         /// <summary>
@@ -1953,7 +1953,7 @@ namespace FlaxEngine
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public bool Equals(Vector2 other)
         {
-            return Equals(ref other);
+            return Mathf.NearEqual(X, X) && Mathf.NearEqual(other.Y, other.Y);
         }
 
         /// <summary>
@@ -1965,11 +1965,9 @@ namespace FlaxEngine
         /// </returns>
         public override bool Equals(object value)
         {
-            if (!(value is Vector2))
+            if (!(value is Vector2 other))
                 return false;
-
+            return Mathf.NearEqual(X, X) && Mathf.NearEqual(other.Y, other.Y);
-            var strongValue = (Vector2)value;
-            return Equals(ref strongValue);
         }
     }
 }

Source/Engine/Core/Math/Vector3.cs

@@ -2049,7 +2049,7 @@ namespace FlaxEngine
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public static bool operator ==(Vector3 left, Vector3 right)
         {
-            return left.Equals(ref right);
+            return Mathf.NearEqual(left.X, right.X) && Mathf.NearEqual(left.Y, right.Y) && Mathf.NearEqual(left.Z, right.Z);
         }
 
         /// <summary>
@@ -2061,7 +2061,7 @@ namespace FlaxEngine
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public static bool operator !=(Vector3 left, Vector3 right)
         {
-            return !left.Equals(ref right);
+            return !Mathf.NearEqual(left.X, right.X) || !Mathf.NearEqual(left.Y, right.Y) || !Mathf.NearEqual(left.Z, right.Z);
         }
 
         /// <summary>
@@ -2162,7 +2162,7 @@ namespace FlaxEngine
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public bool Equals(Vector3 other)
         {
-            return Equals(ref other);
+            return Mathf.NearEqual(other.X, X) && Mathf.NearEqual(other.Y, Y) && Mathf.NearEqual(other.Z, Z);
         }
 
         /// <summary>
@@ -2172,10 +2172,9 @@ namespace FlaxEngine
         /// <returns><c>true</c> if the specified <see cref="System.Object" /> is equal to this instance; otherwise, <c>false</c>.</returns>
         public override bool Equals(object value)
         {
-            if (!(value is Vector3))
+            if (!(value is Vector3 other))
                 return false;
-            var strongValue = (Vector3)value;
+            return Mathf.NearEqual(other.X, X) && Mathf.NearEqual(other.Y, Y) && Mathf.NearEqual(other.Z, Z);
-            return Equals(ref strongValue);
         }
     }
 }

Source/Engine/Core/Math/Vector4.cs

@@ -1680,7 +1680,7 @@ namespace FlaxEngine
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public bool Equals(Vector4 other)
         {
-            return Equals(ref other);
+            return Mathf.NearEqual(other.X, X) && Mathf.NearEqual(other.Y, Y) && Mathf.NearEqual(other.Z, Z) && Mathf.NearEqual(other.W, W);
         }
 
         /// <summary>
@@ -1692,11 +1692,9 @@ namespace FlaxEngine
         /// </returns>
         public override bool Equals(object value)
         {
-            if (!(value is Vector4))
+            if (!(value is Vector4 other))
                 return false;
-
+            return Mathf.NearEqual(other.X, X) && Mathf.NearEqual(other.Y, Y) && Mathf.NearEqual(other.Z, Z) && Mathf.NearEqual(other.W, W);
-            var strongValue = (Vector4)value;
-            return Equals(ref strongValue);
         }
     }
 }

Source/Engine/UI/GUI/ContainerControl.cs

@@ -23,12 +23,21 @@ namespace FlaxEngine.GUI
         [NoSerialize]
         protected bool _containsFocus;
 
+        /// <summary>
+        /// The layout locking flag.
+        /// </summary>
+        [NoSerialize]
+        protected bool _isLayoutLocked;
+
+        private bool _clipChildren = true;
+        private bool _cullChildren = true;
+
         /// <summary>
         /// Initializes a new instance of the <see cref="ContainerControl"/> class.
         /// </summary>
         public ContainerControl()
         {
-            IsLayoutLocked = true;
+            _isLayoutLocked = true;
         }
 
         /// <summary>
@@ -37,7 +46,7 @@ namespace FlaxEngine.GUI
         public ContainerControl(float x, float y, float width, float height)
         : base(x, y, width, height)
         {
-            IsLayoutLocked = true;
+            _isLayoutLocked = true;
         }
 
         /// <summary>
@@ -46,14 +55,14 @@ namespace FlaxEngine.GUI
         public ContainerControl(Vector2 location, Vector2 size)
         : base(location, size)
         {
-            IsLayoutLocked = true;
+            _isLayoutLocked = true;
         }
 
         /// <inheritdoc />
         public ContainerControl(Rectangle bounds)
         : base(bounds)
         {
-            IsLayoutLocked = true;
+            _isLayoutLocked = true;
         }
 
         /// <summary>
@@ -80,30 +89,39 @@ namespace FlaxEngine.GUI
         /// True if automatic updates for control layout are locked (useful when creating a lot of GUI control to prevent lags).
         /// </summary>
         [HideInEditor, NoSerialize]
-        public bool IsLayoutLocked { get; set; }
+        public bool IsLayoutLocked
+        {
+            get => _isLayoutLocked;
+            set => _isLayoutLocked = value;
+        }
 
         /// <summary>
         /// Gets or sets a value indicating whether apply clipping mask on children during rendering.
         /// </summary>
         [EditorOrder(530), Tooltip("If checked, control will apply clipping mask on children during rendering.")]
-        public bool ClipChildren { get; set; } = true;
+        public bool ClipChildren
+        {
+            get => _clipChildren;
+            set => _clipChildren = value;
+        }
 
         /// <summary>
         /// Gets or sets a value indicating whether perform view culling on children during rendering.
         /// </summary>
         [EditorOrder(540), Tooltip("If checked, control will perform view culling on children during rendering.")]
-        public bool CullChildren { get; set; } = true;
+        public bool CullChildren
+        {
+            get => _cullChildren;
+            set => _cullChildren = value;
+        }
 
         /// <summary>
         /// Locks all child controls layout and itself.
         /// </summary>
         [NoAnimate]
-        public virtual void LockChildrenRecursive()
+        public void LockChildrenRecursive()
         {
-            // Itself
+            _isLayoutLocked = true;
-            IsLayoutLocked = true;
-
-            // Every child container control
             for (int i = 0; i < _children.Count; i++)
             {
                 if (_children[i] is ContainerControl child)
@@ -115,12 +133,9 @@ namespace FlaxEngine.GUI
         /// Unlocks all the child controls layout and itself.
         /// </summary>
         [NoAnimate]
-        public virtual void UnlockChildrenRecursive()
+        public void UnlockChildrenRecursive()
         {
-            // Itself
+            _isLayoutLocked = false;
-            IsLayoutLocked = false;
-
-            // Every child container control
             for (int i = 0; i < _children.Count; i++)
             {
                 if (_children[i] is ContainerControl child)
@@ -134,8 +149,8 @@ namespace FlaxEngine.GUI
         [NoAnimate]
         public virtual void RemoveChildren()
         {
-            bool wasLayoutLocked = IsLayoutLocked;
+            bool wasLayoutLocked = _isLayoutLocked;
-            IsLayoutLocked = true;
+            _isLayoutLocked = true;
 
             // Delete children
             while (_children.Count > 0)
@@ -143,7 +158,7 @@ namespace FlaxEngine.GUI
                 _children[0].Parent = null;
             }
 
-            IsLayoutLocked = wasLayoutLocked;
+            _isLayoutLocked = wasLayoutLocked;
             PerformLayout();
         }
 
@@ -152,8 +167,8 @@ namespace FlaxEngine.GUI
         /// </summary>
         public virtual void DisposeChildren()
         {
-            bool wasLayoutLocked = IsLayoutLocked;
+            bool wasLayoutLocked = _isLayoutLocked;
-            IsLayoutLocked = true;
+            _isLayoutLocked = true;
 
             // Delete children
             while (_children.Count > 0)
@@ -161,7 +176,7 @@ namespace FlaxEngine.GUI
                 _children[0].Dispose();
             }
 
-            IsLayoutLocked = wasLayoutLocked;
+            _isLayoutLocked = wasLayoutLocked;
             PerformLayout();
         }
 
@@ -253,7 +268,6 @@ namespace FlaxEngine.GUI
                 return;
             _children.RemoveAt(oldIndex);
 
-            // Check if index is invalid
             if (newIndex < 0 || newIndex >= _children.Count)
             {
                 // Append at the end
@@ -279,8 +293,6 @@ namespace FlaxEngine.GUI
             for (int i = _children.Count - 1; i >= 0; i--)
             {
                 var child = _children[i];
-
-                // Check collision
                 if (IntersectsChildContent(child, point, out var childLocation))
                 {
                     result = i;
@@ -499,10 +511,7 @@ namespace FlaxEngine.GUI
             // Check if state has been changed
             if (result != _containsFocus)
             {
-                // Cache flag
                 _containsFocus = result;
-
-                // Fire event
                 if (result)
                 {
                     OnStartContainsFocus();
@@ -563,24 +572,6 @@ namespace FlaxEngine.GUI
             _children.Clear();
         }
 
-        /// <inheritdoc />
-        public override bool IsMouseOver
-        {
-            get
-            {
-                if (base.IsMouseOver)
-                    return true;
-
-                for (int i = 0; i < _children.Count && _children.Count > 0; i++)
-                {
-                    if (_children[i].IsMouseOver)
-                        return true;
-                }
-
-                return false;
-            }
-        }
-
         /// <inheritdoc />
         public override bool IsTouchOver
         {
@@ -619,7 +610,7 @@ namespace FlaxEngine.GUI
         {
             DrawSelf();
 
-            if (ClipChildren)
+            if (_clipChildren)
             {
                 GetDesireClientArea(out var clientArea);
                 Render2D.PushClip(ref clientArea);
@@ -646,7 +637,7 @@ namespace FlaxEngine.GUI
         protected virtual void DrawChildren()
         {
             // Draw all visible child controls
-            if (CullChildren)
+            if (_cullChildren)
             {
                 Render2D.PeekClip(out var globalClipping);
                 Render2D.PeekTransform(out var globalTransform);
@@ -684,10 +675,10 @@ namespace FlaxEngine.GUI
         /// <inheritdoc />
         public override void PerformLayout(bool force = false)
         {
-            if (IsLayoutLocked && !force)
+            if (_isLayoutLocked && !force)
                 return;
 
-            bool wasLocked = IsLayoutLocked;
+            bool wasLocked = _isLayoutLocked;
             if (!wasLocked)
                 LockChildrenRecursive();
 
@@ -711,7 +702,6 @@ namespace FlaxEngine.GUI
                 var child = _children[i];
                 if (child.Visible && child.Enabled)
                 {
-                    // Fire event
                     if (IntersectsChildContent(child, location, out var childLocation))
                     {
                         // Enter
@@ -732,7 +722,6 @@ namespace FlaxEngine.GUI
                 var child = _children[i];
                 if (child.Visible && child.Enabled)
                 {
-                    // Fire events
                     if (IntersectsChildContent(child, location, out var childLocation))
                     {
                         if (child.IsMouseOver)
@@ -1035,7 +1024,6 @@ namespace FlaxEngine.GUI
                 var child = _children[i];
                 if (child.Visible && child.Enabled)
                 {
-                    // Fire event
                     if (IntersectsChildContent(child, location, out var childLocation))
                     {
                         // Enter
@@ -1061,7 +1049,6 @@ namespace FlaxEngine.GUI
                 var child = _children[i];
                 if (child.Visible && child.Enabled)
                 {
-                    // Fire events
                     if (IntersectsChildContent(child, location, out var childLocation))
                     {
                         if (child.IsDragOver)
@@ -1120,7 +1107,6 @@ namespace FlaxEngine.GUI
                 var child = _children[i];
                 if (child.Visible && child.Enabled)
                 {
-                    // Fire event
                     if (IntersectsChildContent(child, location, out var childLocation))
                     {
                         // Enter
@@ -1138,10 +1124,9 @@ namespace FlaxEngine.GUI
         protected override void OnSizeChanged()
         {
             // Lock updates to prevent additional layout calculations
-            bool wasLayoutLocked = IsLayoutLocked;
+            bool wasLayoutLocked = _isLayoutLocked;
-            IsLayoutLocked = true;
+            _isLayoutLocked = true;
 
-            // Base
             base.OnSizeChanged();
 
             // Fire event
@@ -1151,7 +1136,7 @@ namespace FlaxEngine.GUI
             }
 
             // Restore state
-            IsLayoutLocked = wasLayoutLocked;
+            _isLayoutLocked = wasLayoutLocked;
 
             // Arrange child controls
             PerformLayout();

Source/Engine/UI/GUI/Control.Bounds.cs

@@ -150,7 +150,13 @@ namespace FlaxEngine.GUI
         public Vector2 Location
         {
             get => _bounds.Location;
-            set => Bounds = new Rectangle(value, _bounds.Size);
+            set
+            {
+                if (_bounds.Location.Equals(ref value))
+                    return;
+                var bounds = new Rectangle(value, _bounds.Size);
+                SetBounds(ref bounds);
+            }
         }
 
         /// <summary>
@@ -170,7 +176,13 @@ namespace FlaxEngine.GUI
         public float Width
         {
             get => _bounds.Size.X;
-            set => Bounds = new Rectangle(_bounds.Location, value, _bounds.Size.Y);
+            set
+            {
+                if (Mathf.NearEqual(_bounds.Size.X, value))
+                    return;
+                var bounds = new Rectangle(_bounds.Location, value, _bounds.Size.Y);
+                SetBounds(ref bounds);
+            }
         }
 
         /// <summary>
@@ -180,7 +192,13 @@ namespace FlaxEngine.GUI
         public float Height
         {
             get => _bounds.Size.Y;
-            set => Bounds = new Rectangle(_bounds.Location, _bounds.Size.X, value);
+            set
+            {
+                if (Mathf.NearEqual(_bounds.Size.Y, value))
+                    return;
+                var bounds = new Rectangle(_bounds.Location, _bounds.Size.X, value);
+                SetBounds(ref bounds);
+            }
         }
 
         /// <summary>
@@ -190,7 +208,13 @@ namespace FlaxEngine.GUI
         public Vector2 Size
         {
             get => _bounds.Size;
-            set => Bounds = new Rectangle(_bounds.Location, value);
+            set
+            {
+                if (_bounds.Size.Equals(ref value))
+                    return;
+                var bounds = new Rectangle(_bounds.Location, value);
+                SetBounds(ref bounds);
+            }
         }
 
         /// <summary>
@@ -425,12 +449,12 @@ namespace FlaxEngine.GUI
             UpdateTransform();
 
             // Handle location/size changes
-            if (_bounds.Location != prevBounds.Location)
+            if (!_bounds.Location.Equals(ref prevBounds.Location))
             {
                 OnLocationChanged();
             }
 
-            if (_bounds.Size != prevBounds.Size)
+            if (!_bounds.Size.Equals(ref prevBounds.Size))
             {
                 OnSizeChanged();
             }

Source/Engine/UI/GUI/Panels/Panel.cs

@@ -177,15 +177,15 @@ namespace FlaxEngine.GUI
         /// <inheritdoc />
         protected override void SetViewOffset(ref Vector2 value)
         {
-            bool wasLocked = IsLayoutLocked;
+            bool wasLocked = _isLayoutLocked;
-            IsLayoutLocked = true;
+            _isLayoutLocked = true;
 
             if (HScrollBar != null)
                 HScrollBar.Value = -value.X;
             if (VScrollBar != null)
                 VScrollBar.Value = -value.Y;
 
-            IsLayoutLocked = wasLocked;
+            _isLayoutLocked = wasLocked;
             base.SetViewOffset(ref value);
         }
 
@@ -239,15 +239,15 @@ namespace FlaxEngine.GUI
         /// <param name="fastScroll">True of scroll to the item quickly without smoothing.</param>
         public void ScrollViewTo(Rectangle bounds, bool fastScroll = false)
         {
-            bool wasLocked = IsLayoutLocked;
+            bool wasLocked = _isLayoutLocked;
-            IsLayoutLocked = true;
+            _isLayoutLocked = true;
 
             if (HScrollBar != null && HScrollBar.Enabled)
                 HScrollBar.ScrollViewTo(bounds.Left, bounds.Right, fastScroll);
             if (VScrollBar != null && VScrollBar.Enabled)
                 VScrollBar.ScrollViewTo(bounds.Top, bounds.Bottom, fastScroll);
 
-            IsLayoutLocked = wasLocked;
+            _isLayoutLocked = wasLocked;
             PerformLayout();
         }
 
@@ -406,14 +406,14 @@ namespace FlaxEngine.GUI
                 return;
             _layoutUpdateLock++;
 
-            if (!IsLayoutLocked)
+            if (!_isLayoutLocked)
             {
                 _layoutChanged = false;
             }
 
             base.PerformLayout(force);
 
-            if (!IsLayoutLocked && _layoutChanged)
+            if (!_isLayoutLocked && _layoutChanged)
             {
                 _layoutChanged = false;
                 PerformLayout(true);