some mac changes?

#2800

.github/workflows/build_linux.yml

@@ -16,7 +16,8 @@ jobs:
       uses: actions/checkout@v3
     - name: Install dependencies
       run: |
-        sudo apt-get install libx11-dev libxcursor-dev libxinerama-dev build-essential gettext libtool libtool-bin libpulse-dev libasound2-dev libjack-dev portaudio19-dev
+        sudo apt-get update
+        sudo apt-get install -y --fix-missing libx11-dev libxcursor-dev libxinerama-dev build-essential gettext libtool libtool-bin libpulse-dev libasound2-dev libjack-dev portaudio19-dev libwayland-dev
     - name: Setup Vulkan
       uses: ./.github/actions/vulkan
     - name: Setup .NET
@@ -44,7 +45,7 @@ jobs:
       uses: actions/checkout@v3
     - name: Install dependencies
       run: |
-        sudo apt-get install libx11-dev libxcursor-dev libxinerama-dev
+        sudo apt-get install libx11-dev libxcursor-dev libxinerama-dev libwayland-dev
     - name: Setup Vulkan
       uses: ./.github/actions/vulkan
     - name: Setup .NET

.github/workflows/cd.yml

@@ -87,7 +87,8 @@ jobs:
         git ${{ env.GIT_LFS_PULL_OPTIONS }} lfs pull
     - name: Install dependencies
       run: |
-        sudo apt-get install libx11-dev libxcursor-dev libxinerama-dev build-essential gettext libtool libtool-bin libpulse-dev libasound2-dev libjack-dev portaudio19-dev
+        sudo apt-get update
+        sudo apt-get install -y --fix-missing libx11-dev libxcursor-dev libxinerama-dev build-essential gettext libtool libtool-bin libpulse-dev libasound2-dev libjack-dev portaudio19-dev
     - name: Setup Vulkan
       uses: ./.github/actions/vulkan
     - name: Setup .NET
@@ -118,7 +119,8 @@ jobs:
         git ${{ env.GIT_LFS_PULL_OPTIONS }} lfs pull
     - name: Install dependencies
       run: |
-        sudo apt-get install libx11-dev libxcursor-dev libxinerama-dev build-essential gettext libtool libtool-bin libpulse-dev libasound2-dev libjack-dev portaudio19-dev
+        sudo apt-get update
+        sudo apt-get install -y --fix-missing libx11-dev libxcursor-dev libxinerama-dev build-essential gettext libtool libtool-bin libpulse-dev libasound2-dev libjack-dev portaudio19-dev
     - name: Setup Vulkan
       uses: ./.github/actions/vulkan
     - name: Setup .NET

.github/workflows/tests.yml

@@ -28,7 +28,8 @@ jobs:
         git lfs pull
     - name: Install dependencies
       run: |
-        sudo apt-get install libx11-dev libxcursor-dev libxinerama-dev build-essential gettext libtool libtool-bin libpulse-dev libasound2-dev libjack-dev portaudio19-dev
+        sudo apt-get update
+        sudo apt-get install -y --fix-missing libx11-dev libxcursor-dev libxinerama-dev build-essential gettext libtool libtool-bin libpulse-dev libasound2-dev libjack-dev portaudio19-dev libwayland-dev
     - name: Build
       run: |
         ./GenerateProjectFiles.sh -vs2022 -log -verbose -printSDKs -dotnet=8

Content/Editor/MaterialTemplates/Features/ForwardShading.hlsl

@@ -4,8 +4,8 @@
 #define MAX_LOCAL_LIGHTS 4
 @1// Forward Shading: Includes
 #include "./Flax/LightingCommon.hlsl"
-#if USE_REFLECTIONS
 #include "./Flax/ReflectionsCommon.hlsl"
+#if USE_REFLECTIONS
 #define MATERIAL_REFLECTIONS_SSR 1
 #if MATERIAL_REFLECTIONS == MATERIAL_REFLECTIONS_SSR
 #include "./Flax/SSR.hlsl"
@@ -14,11 +14,13 @@
 #include "./Flax/Lighting.hlsl"
 #include "./Flax/ShadowsSampling.hlsl"
 #include "./Flax/ExponentialHeightFog.hlsl"
+#include "./Flax/VolumetricFog.hlsl"
 @2// Forward Shading: Constants
 LightData DirectionalLight;
 LightData SkyLight;
-ProbeData EnvironmentProbe;
+EnvProbeData EnvironmentProbe;
 ExponentialHeightFogData ExponentialHeightFog;
+VolumetricFogData VolumetricFog;
 float3 Dummy2;
 uint LocalLightsCount;
 LightData LocalLights[MAX_LOCAL_LIGHTS];
@@ -28,12 +30,14 @@ TextureCube SkyLightTexture : register(t__SRV__);
 Buffer<float4> ShadowsBuffer : register(t__SRV__);
 Texture2D<float> ShadowMap : register(t__SRV__);
 Texture3D VolumetricFogTexture : register(t__SRV__);
+Texture2D PreIntegratedGF : register(t__SRV__);
 @4// Forward Shading: Utilities
 // Public accessors for lighting data, use them as data binding might change but those methods will remain.
 LightData GetDirectionalLight() { return DirectionalLight; }
 LightData GetSkyLight() { return SkyLight; }
-ProbeData GetEnvironmentProbe() { return EnvironmentProbe; }
+EnvProbeData GetEnvironmentProbe() { return EnvironmentProbe; }
 ExponentialHeightFogData GetExponentialHeightFog() { return ExponentialHeightFog; }
+VolumetricFogData GetVolumetricFog() { return VolumetricFog; }
 uint GetLocalLightsCount() { return LocalLightsCount; }
 LightData GetLocalLight(uint i) { return LocalLights[i]; }
 @5// Forward Shading: Shaders
@@ -108,7 +112,8 @@ void PS_Forward(
 
 	// Calculate reflections
 #if USE_REFLECTIONS
-	float3 reflections = SampleReflectionProbe(ViewPos, EnvProbe, EnvironmentProbe, gBuffer.WorldPos, gBuffer.Normal, gBuffer.Roughness).rgb;
+	float4 reflections = SampleReflectionProbe(ViewPos, EnvProbe, EnvironmentProbe, gBuffer.WorldPos, gBuffer.Normal, gBuffer.Roughness);
+	reflections.rgb *= reflections.a;
 
 #if MATERIAL_REFLECTIONS == MATERIAL_REFLECTIONS_SSR
 	// Screen Space Reflections
@@ -116,7 +121,7 @@ void PS_Forward(
 	Texture2D sceneColorTexture = MATERIAL_REFLECTIONS_SSR_COLOR;
 	float2 screenUV = materialInput.SvPosition.xy * ScreenSize.zw;
 	float stepSize = ScreenSize.z; // 1 / screenWidth
-	float maxSamples = 48;
+	float maxSamples = 50;
 	float worldAntiSelfOcclusionBias = 0.1f;
 	float brdfBias = 0.82f;
 	float drawDistance = 5000.0f;
@@ -124,7 +129,7 @@ void PS_Forward(
 	if (hit.z > 0)
 	{
 		float3 screenColor = sceneColorTexture.SampleLevel(SamplerPointClamp, hit.xy, 0).rgb;
-		reflections = lerp(reflections, screenColor, hit.z);
+		reflections.rgb = lerp(reflections.rgb, screenColor, hit.z);
 	}
 
 	// Fallback to software tracing if possible
@@ -136,17 +141,17 @@ void PS_Forward(
 		if (TraceSDFSoftwareReflections(gBuffer, reflectWS, surfaceAtlas))
 		{
 			float3 screenColor = sceneColorTexture.SampleLevel(SamplerPointClamp, hit.xy, 0).rgb;
-        	reflections = lerp(surfaceAtlas, float4(screenColor, 1), hit.z);
+        	reflections.rgb = lerp(surfaceAtlas, float4(screenColor, 1), hit.z);
 		}
 	}
 #endif
 #endif
 
-	light.rgb += reflections * GetReflectionSpecularLighting(ViewPos, gBuffer) * light.a;	
+	light.rgb += reflections.rgb * GetReflectionSpecularLighting(PreIntegratedGF, ViewPos, gBuffer);
 #endif
 
-	// Add lighting (apply ambient occlusion)
+	// Add lighting
-	output.rgb += light.rgb * gBuffer.AO;
+	output.rgb += light.rgb;
 
 #endif
 
@@ -158,17 +163,13 @@ void PS_Forward(
 #else
 	float fogSceneDistance = gBuffer.ViewPos.z;
 #endif
-	float4 fog = GetExponentialHeightFog(ExponentialHeightFog, materialInput.WorldPosition, ViewPos, 0, fogSceneDistance);
+	float fogSkipDistance = max(ExponentialHeightFog.VolumetricFogMaxDistance - 100, 0);
-
+	float4 fog = GetExponentialHeightFog(ExponentialHeightFog, materialInput.WorldPosition, ViewPos, fogSkipDistance, fogSceneDistance);
 	if (ExponentialHeightFog.VolumetricFogMaxDistance > 0)
 	{
 		// Sample volumetric fog and mix it in
 		float2 screenUV = materialInput.SvPosition.xy * ScreenSize.zw;
-		float3 viewVector = materialInput.WorldPosition - ViewPos;
+		float4 volumetricFog = SampleVolumetricFog(VolumetricFogTexture, VolumetricFog, materialInput.WorldPosition - ViewPos, screenUV, TemporalAAJitter);
-		float sceneDepth = length(viewVector);
-		float depthSlice = sceneDepth / ExponentialHeightFog.VolumetricFogMaxDistance;
-		float3 volumeUV = float3(screenUV, depthSlice);
-		float4 volumetricFog = VolumetricFogTexture.SampleLevel(SamplerLinearClamp, volumeUV, 0);
 		fog = CombineVolumetricFog(fog, volumetricFog);
 	}
 

Content/Editor/MaterialTemplates/GUI.shader

@@ -38,6 +38,7 @@ struct VertexOutput
 #endif
 	float4 ClipExtents       : TEXCOORD3;
 	float2 ClipOrigin        : TEXCOORD4;
+    float2 CustomData        : TEXCOORD5; // x-per-geometry type, y-features mask
 #if USE_CUSTOM_VERTEX_INTERPOLATORS
 	float4 CustomVSToPS[CUSTOM_VERTEX_INTERPOLATORS_COUNT] : TEXCOORD9;
 #endif
@@ -55,6 +56,7 @@ struct PixelInput
 #endif
 	float4 ClipExtents       : TEXCOORD3;
 	float2 ClipOrigin        : TEXCOORD4;
+    float2 CustomData        : TEXCOORD5; // x-per-geometry type, y-features mask
 #if USE_CUSTOM_VERTEX_INTERPOLATORS
 	float4 CustomVSToPS[CUSTOM_VERTEX_INTERPOLATORS_COUNT] : TEXCOORD9;
 #endif
@@ -67,6 +69,7 @@ struct MaterialInput
 	float3 WorldPosition;
 	float TwoSidedSign;
 	float2 TexCoord;
+    float2 CustomData; // x-per-geometry type, y-features mask
 #if USE_VERTEX_COLOR
 	half4 VertexColor;
 #endif
@@ -84,6 +87,7 @@ MaterialInput GetMaterialInput(Render2DVertex input, VertexOutput output)
 	MaterialInput result;
 	result.WorldPosition = output.WorldPosition;
 	result.TexCoord = output.TexCoord;
+	result.CustomData = input.CustomDataAndClipOrigin.xy;
 #if USE_VERTEX_COLOR
 	result.VertexColor = output.VertexColor;
 #endif
@@ -103,6 +107,7 @@ MaterialInput GetMaterialInput(PixelInput input)
 	MaterialInput result;
 	result.WorldPosition = input.WorldPosition;
 	result.TexCoord = input.TexCoord;
+	result.CustomData = input.CustomData;
 #if USE_VERTEX_COLOR
 	result.VertexColor = input.VertexColor;
 #endif
@@ -229,6 +234,7 @@ VertexOutput VS_GUI(Render2DVertex input)
 #if USE_VERTEX_COLOR
 	output.VertexColor = input.Color;
 #endif
+	output.CustomData = input.CustomDataAndClipOrigin.xy;
 	output.ClipOrigin = input.CustomDataAndClipOrigin.zw;
 	output.ClipExtents = input.ClipExtents;
 

Content/Editor/MaterialTemplates/VolumeParticle.shader

@@ -8,6 +8,7 @@
 #include "./Flax/Common.hlsl"
 #include "./Flax/MaterialCommon.hlsl"
 #include "./Flax/GBufferCommon.hlsl"
+#include "./Flax/VolumetricFog.hlsl"
 @7
 
 // Primary constant buffer (with additional material parameters)
@@ -21,6 +22,7 @@ float Dummy0;
 float VolumetricFogMaxDistance;
 int ParticleStride;
 int ParticleIndex;
+float4 GridSliceParameters;
 @1META_CB_END
 
 // Particles attributes buffer
@@ -202,19 +204,19 @@ Material GetMaterialPS(MaterialInput input)
 META_PS(true, FEATURE_LEVEL_SM5)
 void PS_VolumetricFog(Quad_GS2PS input, out float4 VBufferA : SV_Target0, out float4 VBufferB : SV_Target1)
 {
+	// Reproject grid position back to the screen and world space
 	uint3 gridCoordinate = uint3(input.Vertex.Position.xy, input.LayerIndex);
 	float3 cellOffset = 0.5f;
 	float2 volumeUV = (gridCoordinate.xy + cellOffset.xy) / GridSize.xy;
-	float zSlice = gridCoordinate.z + cellOffset.z;
+	float sceneDepth = GetDepthFromSlice(GridSliceParameters, gridCoordinate.z + cellOffset.z) / ViewFar;
-	float sceneDepth = (zSlice / GridSize.z) * VolumetricFogMaxDistance / ViewFar;
 	float deviceDepth = (ViewInfo.w / sceneDepth) + ViewInfo.z;
 	float4 clipPos = float4(volumeUV * float2(2.0, -2.0) + float2(-1.0, 1.0), deviceDepth, 1.0);
 	float4 wsPos = mul(clipPos, InverseViewProjectionMatrix);
-	float3 positionWS = wsPos.xyz / wsPos.w;
+	wsPos.xyz /= wsPos.w;
 
 	// Get material parameters
 	MaterialInput materialInput = (MaterialInput)0;
-	materialInput.WorldPosition = positionWS;
+	materialInput.WorldPosition = wsPos.xyz;
 	materialInput.TexCoord = input.Vertex.TexCoord;
 	materialInput.ParticleIndex = ParticleIndex;
 	materialInput.TBN = float3x3(float3(1, 0, 0), float3(0, 1, 0), float3(0, 0, 1));
@@ -225,9 +227,10 @@ void PS_VolumetricFog(Quad_GS2PS input, out float4 VBufferA : SV_Target0, out fl
 	Material material = GetMaterialPS(materialInput);
 
 	// Compute fog properties
+	material.Opacity *= material.Mask;
 	float3 albedo = material.Color;
-	float extinction = material.Opacity * material.Mask * 0.001f;
+	float extinction = material.Opacity * 0.001f;
-	float3 emission = material.Emissive;
+	float3 emission = material.Emissive * material.Opacity;
 	float3 scattering = albedo * extinction;
 	float absorption = max(0.0f, extinction - Luminance(scattering));
 

Content/Shaders/GI/GlobalSurfaceAtlas.flax

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:0f34bf867df5f4296ca66ac691c2bca4efa168fb9e21ca4e613e8086669575cf
+oid sha256:615dff65b01507be6c4de722e126324aba20fc197f8e12dafaa94a05e46cba6e
-size 13296
+size 13222

Content/Shaders/GlobalSignDistanceField.flax

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:064f54786958f109222c49cbc0358ff4f345b30010fcd5e8cc1fab7bdc68c4fe
+oid sha256:1f07ebb16820897e8598ae7a0627cb75b3d28e9dceea3ad4bd9ff543d5cdd01c
-size 13349
+size 13979

Content/Shaders/VolumetricFog.flax

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:872ac3560279bfd0aeb989ebac1b49750dd142b985bc40058888dfd2b63fe9b2
+oid sha256:706adde844360c2b0e65ecabaf1d2e2cc4eb4ac7ca9d483d0dd04ec8163b3d97
-size 13214
+size 13081

Flax.flaxproj

@@ -2,17 +2,18 @@
   "Name": "Flax",
   "Version": {
     "Major": 1,
-    "Minor": 11,
+    "Minor": 12,
     "Revision": 0,
-    "Build": 6805
+    "Build": 6905
   },
   "Company": "Flax",
-  "Copyright": "Copyright (c) 2012-2025 Wojciech Figat. All rights reserved.",
+  "Copyright": "Copyright (c) 2012-2026 Wojciech Figat. All rights reserved.",
   "GameTarget": "FlaxGame",
   "EditorTarget": "FlaxEditor",
   "Configuration": {
     "UseCSharp": true,
     "UseLargeWorlds": false,
-    "UseDotNet": true
+    "UseDotNet": true,
+    "UseSDL": true
   }
 }

Flax.sln.DotSettings

@@ -188,7 +188,7 @@
 	<s:Boolean x:Key="/Default/CodeStyle/CodeFormatting/CSharpFormat/PLACE_FIELD_ATTRIBUTE_ON_SAME_LINE/@EntryValue">False</s:Boolean>
 	<s:String x:Key="/Default/CodeStyle/CodeFormatting/CSharpFormat/PLACE_FIELD_ATTRIBUTE_ON_SAME_LINE_EX/@EntryValue">NEVER</s:String>
 	<s:Boolean x:Key="/Default/CodeStyle/CodeFormatting/CSharpFormat/PLACE_SIMPLE_ACCESSOR_ATTRIBUTE_ON_SAME_LINE/@EntryValue">False</s:Boolean>
-	<s:String x:Key="/Default/CodeStyle/CodeFormatting/CSharpFormat/PLACE_SIMPLE_CASE_STATEMENT_ON_SAME_LINE/@EntryValue">ALWAYS</s:String>
+	
 	<s:String x:Key="/Default/CodeStyle/CodeFormatting/CSharpFormat/PLACE_SIMPLE_EMBEDDED_STATEMENT_ON_SAME_LINE/@EntryValue">NEVER</s:String>
 	<s:String x:Key="/Default/CodeStyle/CodeFormatting/CSharpFormat/SIMPLE_CASE_STATEMENT_STYLE/@EntryValue">ON_SINGLE_LINE</s:String>
 	<s:Boolean x:Key="/Default/CodeStyle/CodeFormatting/CSharpFormat/SPACE_AFTER_TYPECAST_PARENTHESES/@EntryValue">False</s:Boolean>

GenerateProjectFiles.command

@@ -12,6 +12,6 @@ cd "`dirname "$0"`"
 bash ./Development/Scripts/Mac/CallBuildTool.sh --genproject "$@"
 
 # Build bindings for all editor configurations
-echo Building C# bindings...
+#echo Building C# bindings...
 # TODO: Detect the correct architecture here
-Binaries/Tools/Flax.Build -build -BuildBindingsOnly -arch=ARM64 -platform=Mac --buildTargets=FlaxEditor
+#Binaries/Tools/Flax.Build -build -BuildBindingsOnly -arch=ARM64 -platform=Mac --buildTargets=FlaxEditor

Source/Editor/Content/Import/TextureImportEntry.cs

@@ -187,6 +187,11 @@ namespace FlaxEditor.Content.Import
                 // Glossiness, metalness, ambient occlusion, displacement, height, cavity or specular
                 _settings.Settings.Type = TextureFormatType.GrayScale;
             }
+            else if (_settings.Settings.Type == TextureFormatType.ColorRGB)
+            {
+                // Blind guess that common color texture is sRGB
+                _settings.Settings.sRGB = true;
+            }
 
             // Try to restore target asset texture import options (useful for fast reimport)
             Editor.TryRestoreImportOptions(ref _settings.Settings, ResultUrl);

Source/Editor/Content/Items/ContentFolder.cs

@@ -282,7 +282,7 @@ namespace FlaxEditor.Content
 
             if (data is DragDataFiles)
                 return DragDropEffect.Copy;
-            return _dragOverItems.Effect;
+            return _dragOverItems?.Effect ?? DragDropEffect.None;
         }
 
         /// <inheritdoc />

Source/Editor/Content/Items/CppScriptItem.cs

@@ -20,7 +20,7 @@ namespace FlaxEditor.Content
         }
 
         /// <inheritdoc />
-        public override string TypeDescription => Path.EndsWith(".h") ? "C++ Header File" : "C++ Source Code";
+        public override string TypeDescription => Path.EndsWith(".h") || Path.EndsWith(".hpp") ? "C++ Header File" : "C++ Source Code";
 
         /// <inheritdoc />
         public override SpriteHandle DefaultThumbnail => Editor.Instance.Icons.CPPScript128;

Source/Editor/CustomEditors/Dedicated/EnvironmentProbeEditor.cs

@@ -21,10 +21,12 @@ namespace FlaxEditor.CustomEditors.Dedicated
 
             if (Values.HasDifferentTypes == false)
             {
-                var group = layout.Group("Bake");
+                var group = layout.Group("Probe");
                 group.Panel.ItemsMargin = new Margin(Utilities.Constants.UIMargin * 2);
                 _bake = group.Button("Bake").Button;
                 _bake.Clicked += BakeButtonClicked;
+                var view = group.Button("View", "Opens the probe texture viewer");
+                view.Button.Clicked += OnViewButtonClicked;
             }
         }
 
@@ -50,5 +52,14 @@ namespace FlaxEditor.CustomEditors.Dedicated
                 }
             }
         }
+
+        private void OnViewButtonClicked()
+        {
+            foreach (var value in Values)
+            {
+                if (value is EnvironmentProbe probe && probe.ProbeAsset)
+                    Editor.Instance.ContentEditing.Open(probe.ProbeAsset);
+            }
+        }
     }
 }

Source/Editor/CustomEditors/Dedicated/LocalizationSettingsEditor.cs

@@ -190,12 +190,12 @@ namespace FlaxEditor.CustomEditors.Dedicated
                     foreach (var file in files)
                         FindNewKeysCSharp(file, newKeys, allKeys);
 
-                    // C++
+                    // C/C++
-                    files = Directory.GetFiles(Globals.ProjectSourceFolder, "*.cpp", SearchOption.AllDirectories);
+                    files = Directory.GetFiles(Globals.ProjectSourceFolder, "*.cpp", SearchOption.AllDirectories).Concat(Directory.GetFiles(Globals.ProjectSourceFolder, "*.c", SearchOption.AllDirectories)).ToArray();
                     filesCount += files.Length;
                     foreach (var file in files)
                         FindNewKeysCpp(file, newKeys, allKeys);
-                    files = Directory.GetFiles(Globals.ProjectSourceFolder, "*.h", SearchOption.AllDirectories);
+                    files = Directory.GetFiles(Globals.ProjectSourceFolder, "*.h", SearchOption.AllDirectories).Concat(Directory.GetFiles(Globals.ProjectSourceFolder, "*.hpp", SearchOption.AllDirectories)).ToArray();
                     filesCount += files.Length;
                     foreach (var file in files)
                         FindNewKeysCpp(file, newKeys, allKeys);

Source/Editor/CustomEditors/Dedicated/NavMeshBoundsVolumeEditor.cs

@@ -0,0 +1,38 @@
+// Copyright (c) Wojciech Figat. All rights reserved.
+
+using FlaxEngine;
+
+namespace FlaxEditor.CustomEditors.Dedicated
+{
+    /// <summary>
+    /// Custom editor for <see cref="NavMeshBoundsVolume"/>.
+    /// </summary>
+    /// <seealso cref="ActorEditor" />
+    [CustomEditor(typeof(NavMeshBoundsVolume)), DefaultEditor]
+    internal class NavMeshBoundsVolumeEditor : ActorEditor
+    {
+        /// <inheritdoc />
+        public override void Initialize(LayoutElementsContainer layout)
+        {
+            base.Initialize(layout);
+
+            if (Values.HasDifferentTypes == false)
+            {
+                var button = layout.Button("Build");
+                button.Button.Clicked += OnBuildClicked;
+            }
+        }
+
+        private void OnBuildClicked()
+        {
+            foreach (var value in Values)
+            {
+                if (value is NavMeshBoundsVolume volume)
+                {
+                    Navigation.BuildNavMesh(volume.Box, volume.Scene);
+                    Editor.Instance.Scene.MarkSceneEdited(volume.Scene);
+                }
+            }
+        }
+    }
+}

Source/Editor/CustomEditors/Dedicated/RigidBodyEditor.cs

@@ -1,7 +1,6 @@
 // Copyright (c) Wojciech Figat. All rights reserved.
 
 using System.Collections.Generic;
-using System.Reflection.Emit;
 using FlaxEditor.CustomEditors.GUI;
 using FlaxEngine;
 using FlaxEngine.GUI;

Source/Editor/CustomEditors/Dedicated/ScriptsEditor.cs

@@ -909,7 +909,8 @@ namespace FlaxEditor.CustomEditors.Dedicated
                 settingsButton.Tag = script;
                 settingsButton.Clicked += OnSettingsButtonClicked;
 
-                group.Panel.HeaderTextMargin = new Margin(scriptDrag.Right - 12, 15, 2, 2);
+                // Adjust margin to not overlap with other ui elements in the header
+                group.Panel.HeaderTextMargin = group.Panel.HeaderTextMargin with { Left = scriptDrag.Right - 12, Right = settingsButton.Width + Utilities.Constants.UIMargin };
                 group.Object(values, editor);
                 // Remove drop down arrows and containment lines if no objects in the group
                 if (group.Children.Count == 0)

Source/Editor/CustomEditors/Editors/CollectionEditor.cs

@@ -450,6 +450,7 @@ namespace FlaxEditor.CustomEditors.Editors
         protected bool NotNullItems;
 
         private IntValueBox _sizeBox;
+        private Label _label;
         private Color _background;
         private int _elementsCount, _minCount, _maxCount;
         private bool _readOnly;
@@ -566,7 +567,7 @@ namespace FlaxEditor.CustomEditors.Editors
                     Parent = dropPanel,
                 };
 
-                var label = new Label
+                _label = new Label
                 {
                     Text = "Size",
                     AnchorPreset = AnchorPresets.TopRight,
@@ -592,11 +593,12 @@ namespace FlaxEditor.CustomEditors.Editors
                 panel.Panel.Offsets = new Margin(7, 7, 0, 0);
                 panel.Panel.BackgroundColor = _background;
                 var elementType = ElementType;
+                var bindingAttr = System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.Public;
                 bool single = elementType.IsPrimitive ||
                               elementType.Equals(new ScriptType(typeof(string))) ||
                               elementType.IsEnum ||
-                              (elementType.GetFields().Length == 1 && elementType.GetProperties().Length == 0) ||
+                              (elementType.GetFields(bindingAttr).Length == 1 && elementType.GetProperties(bindingAttr).Length == 0) ||
-                              (elementType.GetProperties().Length == 1 && elementType.GetFields().Length == 0) ||
+                              (elementType.GetProperties(bindingAttr).Length == 1 && elementType.GetFields(bindingAttr).Length == 0) ||
                               elementType.Equals(new ScriptType(typeof(JsonAsset))) ||
                               elementType.Equals(new ScriptType(typeof(SettingsBase)));
                 if (_cachedDropPanels == null)
@@ -672,6 +674,8 @@ namespace FlaxEditor.CustomEditors.Editors
                     Resize(Count + 1);
                 };
             }
+
+            Layout.ContainerControl.SizeChanged += OnLayoutSizeChanged;
         }
         
         private void OnSetupContextMenu(ContextMenu menu, DropPanel panel)
@@ -696,10 +700,24 @@ namespace FlaxEditor.CustomEditors.Editors
             });
         }
 
+        private void OnLayoutSizeChanged(Control control)
+        {
+            if (Layout.ContainerControl is DropPanel dropPanel)
+            {
+                // Hide "Size" text when array editor title overlaps
+                var headerTextSize = dropPanel.HeaderTextFont.GetFont().MeasureText(dropPanel.HeaderText);
+                if (headerTextSize.X + DropPanel.DropDownIconSize >= _label.Left)
+                    _label.TextColor = _label.TextColorHighlighted = Color.Transparent;
+                else
+                    _label.TextColor = _label.TextColorHighlighted = FlaxEngine.GUI.Style.Current.Foreground;
+            }
+        }
+
         /// <inheritdoc />
         protected override void Deinitialize()
         {
             _sizeBox = null;
+            Layout.ContainerControl.SizeChanged -= OnLayoutSizeChanged;
 
             base.Deinitialize();
         }

Source/Editor/CustomEditors/Editors/InputEditor.cs

@@ -47,6 +47,8 @@ namespace FlaxEditor.CustomEditors.Editors
                 return inputEvent;
             if (Values[0] is string str)
                 return str;
+            if (Values.Type.Type == typeof(InputEvent))
+                return new InputEvent();
             if (Values.Type.Type == typeof(string))
                 return string.Empty;
             return null;

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

@@ -44,7 +44,8 @@ namespace FlaxEditor.CustomEditors.Elements
         {
             var style = Style.Current;
             var settingsButtonSize = Panel.HeaderHeight;
-            return new Image
+            Panel.HeaderTextMargin = Panel.HeaderTextMargin with { Right = settingsButtonSize + Utilities.Constants.UIMargin };
+;           return new Image
             {
                 TooltipText = "Settings",
                 AutoFocus = true,

Source/Editor/Editor.cs

@@ -23,6 +23,7 @@ using FlaxEngine.Assertions;
 using FlaxEngine.GUI;
 using FlaxEngine.Interop;
 using FlaxEngine.Json;
+using FlaxEngine.Utilities;
 
 #pragma warning disable CS1591
 
@@ -1370,7 +1371,7 @@ namespace FlaxEditor
         public void BuildCSG()
         {
             var scenes = Level.Scenes;
-            scenes.ToList().ForEach(x => x.BuildCSG(0));
+            scenes.ForEach(x => x.BuildCSG(0));
             Scene.MarkSceneEdited(scenes);
         }
 
@@ -1380,7 +1381,7 @@ namespace FlaxEditor
         public void BuildNavMesh()
         {
             var scenes = Level.Scenes;
-            scenes.ToList().ForEach(x => Navigation.BuildNavMesh(x, 0));
+            Navigation.BuildNavMesh();
             Scene.MarkSceneEdited(scenes);
         }
 

Source/Editor/GUI/ContextMenu/ContextMenu.cs

@@ -502,6 +502,7 @@ namespace FlaxEditor.GUI.ContextMenu
             if (base.OnKeyDown(key))
                 return true;
 
+            // Keyboard navigation around the menu
             switch (key)
             {
             case KeyboardKeys.ArrowDown:
@@ -526,6 +527,20 @@ namespace FlaxEditor.GUI.ContextMenu
                     }
                 }
                 break;
+            case KeyboardKeys.ArrowRight:
+                for (int i = 0; i < _panel.Children.Count; i++)
+                {
+                    if (_panel.Children[i] is ContextMenuChildMenu item && item.Visible && item.IsFocused && !item.ContextMenu.IsOpened)
+                    {
+                        item.ShowChild(this);
+                        item.ContextMenu._panel.Children.FirstOrDefault(x => x is ContextMenuButton && x.Visible)?.Focus();
+                        break;
+                    }
+                }
+                break;
+            case KeyboardKeys.ArrowLeft:
+                ParentCM?.RootWindow.Focus();
+                break;
             }
 
             return false;

Source/Editor/GUI/ContextMenu/ContextMenuBase.cs

@@ -1,7 +1,10 @@
-#if PLATFORM_WINDOWS
+#if PLATFORM_WINDOWS || PLATFORM_SDL
 #define USE_IS_FOREGROUND
 #else
 #endif
+#if PLATFORM_SDL
+#define USE_SDL_WORKAROUNDS
+#endif
 // Copyright (c) Wojciech Figat. All rights reserved.
 
 using System.Collections.Generic;
@@ -72,6 +75,11 @@ namespace FlaxEditor.GUI.ContextMenu
         /// </summary>
         public bool HasChildCMOpened => _childCM != null;
 
+        /// <summary>
+        /// Gets the parent context menu (if exists).
+        /// </summary>
+        public ContextMenuBase ParentCM => _parentCM;
+
         /// <summary>
         /// Gets the topmost context menu.
         /// </summary>
@@ -81,9 +89,7 @@ namespace FlaxEditor.GUI.ContextMenu
             {
                 var cm = this;
                 while (cm._parentCM != null && cm._isSubMenu)
-                {
                     cm = cm._parentCM;
-                }
                 return cm;
             }
         }
@@ -108,6 +114,11 @@ namespace FlaxEditor.GUI.ContextMenu
         /// </summary>
         public bool UseInput = true;
 
+        /// <summary>
+        /// Optional flag that can disable UI navigation (tab/enter).
+        /// </summary>
+        public bool UseNavigation = true;
+
         /// <summary>
         /// Initializes a new instance of the <see cref="ContextMenuBase"/> class.
         /// </summary>
@@ -122,7 +133,7 @@ namespace FlaxEditor.GUI.ContextMenu
         }
 
         /// <summary>
-        /// Shows the empty menu popup o na screen.
+        /// Shows the empty menu popup on a screen.
         /// </summary>
         /// <param name="control">The target control.</param>
         /// <param name="area">The target control area to cover.</param>
@@ -257,7 +268,9 @@ namespace FlaxEditor.GUI.ContextMenu
                 desc.AllowMaximize = false;
                 desc.AllowDragAndDrop = false;
                 desc.IsTopmost = true;
-                desc.IsRegularWindow = false;
+                desc.Type = WindowType.Popup;
+                desc.Parent = parentWin.Window;
+                desc.Title = "ContextMenu";
                 desc.HasSizingFrame = false;
                 OnWindowCreating(ref desc);
                 _window = Platform.CreateWindow(ref desc);
@@ -267,6 +280,12 @@ namespace FlaxEditor.GUI.ContextMenu
                     _window.LostFocus += OnWindowLostFocus;
                 }
 
+#if USE_IS_FOREGROUND && USE_SDL_WORKAROUNDS
+                // The focus between popup and parent windows doesn't change, force hide the popup when clicked on parent
+                parentWin.Window.MouseDown += OnWindowMouseDown;
+                _window.Closed += () => parentWin.Window.MouseDown -= OnWindowMouseDown;
+#endif
+
                 // Attach to the window
                 _parentCM = parent as ContextMenuBase;
                 Parent = _window.GUI;
@@ -441,6 +460,17 @@ namespace FlaxEditor.GUI.ContextMenu
             }
         }
 
+#if USE_SDL_WORKAROUNDS
+        private void OnWindowGotFocus()
+        {
+        }
+        
+        private void OnWindowMouseDown(ref Float2 mousePosition, MouseButton button, ref bool handled)
+        {
+            // The user clicked outside the popup window
+            Hide();
+        }
+#else
         private void OnWindowGotFocus()
         {
             var child = _childCM;
@@ -454,6 +484,7 @@ namespace FlaxEditor.GUI.ContextMenu
                 });
             }
         }
+#endif
 
         private void OnWindowLostFocus()
         {
@@ -552,7 +583,12 @@ namespace FlaxEditor.GUI.ContextMenu
             // Let root context menu to check if none of the popup windows
             if (_parentCM == null && UseVisibilityControl && !IsForeground)
             {
+#if USE_SDL_WORKAROUNDS
+                if (!IsMouseOver)
+                    Hide();
+#else
                 Hide();
+#endif
             }
         }
 #endif
@@ -594,6 +630,21 @@ namespace FlaxEditor.GUI.ContextMenu
             case KeyboardKeys.Escape:
                 Hide();
                 return true;
+            case KeyboardKeys.Return:
+                if (UseNavigation && Root?.FocusedControl != null)
+                {
+                    Root.SubmitFocused();
+                    return true;
+                }
+                break;
+            case KeyboardKeys.Tab:
+                if (UseNavigation && Root != null)
+                {
+                    bool shiftDown = Root.GetKey(KeyboardKeys.Shift);
+                    Root.Navigate(shiftDown ? NavDirection.Previous : NavDirection.Next);
+                    return true;
+                }
+                break;
             }
             return false;
         }

Source/Editor/GUI/ContextMenu/ContextMenuChildMenu.cs

@@ -29,7 +29,7 @@ namespace FlaxEditor.GUI.ContextMenu
             CloseMenuOnClick = false;
         }
 
-        private void ShowChild(ContextMenu parentContextMenu)
+        internal void ShowChild(ContextMenu parentContextMenu)
         {
             // Hide parent CM popups and set itself as child
             var vAlign = parentContextMenu.ItemsAreaMargin.Top;

Source/Editor/GUI/CurveEditor.Contents.cs

@@ -522,6 +522,16 @@ namespace FlaxEditor.GUI
                             cm.AddButton("Show whole curve", _editor.ShowWholeCurve);
                             cm.AddButton("Reset view", _editor.ResetView);
                         }
+                        cm.AddSeparator();
+                        var presetCm = cm.AddChildMenu("Apply preset");
+                        foreach (var value in Enum.GetValues(typeof(CurvePreset)))
+                        {
+                            CurvePreset preset = (CurvePreset)value;
+                            string name = Utilities.Utils.GetPropertyNameUI(preset.ToString());
+                            var b = presetCm.ContextMenu.AddButton(name, () => _editor.ApplyPreset(preset));
+                            b.Enabled = !(_editor is LinearCurveEditor<T> && (preset != CurvePreset.Constant && preset != CurvePreset.Linear));
+                        }
+                        
                         _editor.OnShowContextMenu(cm, selectionCount);
                         cm.Show(this, location);
                     }
@@ -619,6 +629,33 @@ namespace FlaxEditor.GUI
             }
         }
 
+        /// <summary>
+        /// A list of avaliable curve presets for the <see cref="CurveEditor{T}"/>.
+        /// </summary>
+        public enum CurvePreset
+        {
+            /// <summary>
+            /// A curve where every point has the same value.
+            /// </summary>
+            Constant,
+            /// <summary>
+            /// A curve linear curve.
+            /// </summary>
+            Linear,
+            /// <summary>
+            /// A curve that starts a slowly and then accelerates until the end.
+            /// </summary>
+            EaseIn,
+            /// <summary>
+            /// A curve that starts a steep and then flattens until the end.
+            /// </summary>
+            EaseOut,
+            /// <summary>
+            /// A combination of the <see cref="CurvePreset.EaseIn"/> and <see cref="CurvePreset.EaseOut"/> preset.
+            /// </summary>
+            Smoothstep
+        }
+
         /// <inheritdoc />
         public override void OnKeyframesDeselect(IKeyframesEditor editor)
         {

Source/Editor/GUI/CurveEditor.cs

@@ -19,6 +19,48 @@ namespace FlaxEditor.GUI
     /// <seealso cref="CurveEditorBase" />
     public abstract partial class CurveEditor<T> : CurveEditorBase where T : new()
     {
+        /// <summary>
+        /// Represents a single point in a <see cref="CurveEditorPreset"/>.
+        /// </summary>
+        protected struct CurvePresetPoint
+        {
+            /// <summary>
+            /// The time.
+            /// </summary>
+            public float Time;
+
+            /// <summary>
+            /// The value.
+            /// </summary>
+            public float Value;
+
+            /// <summary>
+            /// The in tangent. Will be ignored in <see cref="LinearCurveEditor{T}"/>
+            /// </summary>
+            public float TangentIn;
+
+            /// <summary>
+            /// The out tangent. Will be ignored in <see cref="LinearCurveEditor{T}"/>
+            /// </summary>
+            public float TangentOut;
+        }
+
+        /// <summary>
+        /// A curve preset.
+        /// </summary>
+        protected struct CurveEditorPreset()
+        {
+            /// <summary>
+            /// If the tangents will be linear or smooth.
+            /// </summary>
+            public bool LinearTangents;
+
+            /// <summary>
+            /// The points of the preset.
+            /// </summary>
+            public List<CurvePresetPoint> Points;
+        }
+
         private class Popup : ContextMenuBase
         {
             private CustomEditorPresenter _presenter;
@@ -26,11 +68,12 @@ namespace FlaxEditor.GUI
             private List<int> _keyframeIndices;
             private bool _isDirty;
 
-            public Popup(CurveEditor<T> editor, object[] selection, List<int> keyframeIndices = null, float height = 140.0f)
+            public Popup(CurveEditor<T> editor, object[] selection, List<int> keyframeIndices = null, float maxHeight = 140.0f)
-            : this(editor, height)
+            : this(editor, maxHeight)
             {
                 _presenter.Select(selection);
                 _presenter.OpenAllGroups();
+                Size = new Float2(Size.X, Mathf.Min(_presenter.ContainerControl.Size.Y, maxHeight));
                 _keyframeIndices = keyframeIndices;
                 if (keyframeIndices != null && selection.Length != keyframeIndices.Count)
                     throw new Exception();
@@ -169,7 +212,7 @@ namespace FlaxEditor.GUI
                 if (IsSelected)
                     color = Editor.ContainsFocus ? style.SelectionBorder : Color.Lerp(style.ForegroundDisabled, style.SelectionBorder, 0.4f);
                 if (IsMouseOver)
-                    color *= 1.1f;
+                    color *= 1.5f;
                 Render2D.FillRectangle(rect, color);
             }
 
@@ -285,7 +328,7 @@ namespace FlaxEditor.GUI
         /// <summary>
         /// The keyframes size.
         /// </summary>
-        protected static readonly Float2 KeyframesSize = new Float2(7.0f);
+        protected static readonly Float2 KeyframesSize = new Float2(8.0f);
 
         /// <summary>
         /// The colors for the keyframe points.
@@ -326,6 +369,63 @@ namespace FlaxEditor.GUI
         private Color _labelsColor;
         private Font _labelsFont;
 
+        /// <summary>
+        /// Preset values for <see cref="CurvePreset"/> to be applied to a <see cref="CurveEditor{T}"/>.
+        /// </summary>
+        protected Dictionary<CurvePreset, CurveEditorPreset> Presets = new Dictionary<CurvePreset, CurveEditorPreset>
+        {
+            { CurvePreset.Constant, new CurveEditorPreset
+                {
+                    LinearTangents = true,
+                    Points = new List<CurvePresetPoint>
+                    {
+                        new CurvePresetPoint { Time = 0f, Value = 0.5f, TangentIn = 0f, TangentOut = 0f },
+                        new CurvePresetPoint { Time = 1f, Value = 0.5f, TangentIn = 0f, TangentOut = 0f },
+                    }
+                }
+            },
+            { CurvePreset.EaseIn, new CurveEditorPreset
+                {
+                    LinearTangents = false,
+                    Points = new List<CurvePresetPoint>
+                    {
+                        new CurvePresetPoint { Time = 0f, Value = 0f, TangentIn = 0f, TangentOut = 0f },
+                        new CurvePresetPoint { Time = 1f, Value = 1f, TangentIn = -1.4f, TangentOut = 0f },
+                    }
+                }
+            },
+            { CurvePreset.EaseOut, new CurveEditorPreset
+                {
+                    LinearTangents = false,
+                    Points = new List<CurvePresetPoint>
+                    {
+                        new CurvePresetPoint { Time = 1f, Value = 1f, TangentIn = 0f, TangentOut = 0f },
+                        new CurvePresetPoint { Time = 0f, Value = 0f, TangentIn = 0f, TangentOut = 1.4f },
+                    }
+                }
+            },
+            { CurvePreset.Linear, new CurveEditorPreset
+                {
+                    LinearTangents = true,
+                    Points = new List<CurvePresetPoint>
+                    {
+                        new CurvePresetPoint { Time = 0f, Value = 0f, TangentIn = 0f, TangentOut = 0f },
+                        new CurvePresetPoint { Time = 1f, Value = 1f, TangentIn = 0f, TangentOut = 0f },
+                    }
+                }
+            },
+            { CurvePreset.Smoothstep, new CurveEditorPreset
+                {
+                    LinearTangents = false,
+                    Points = new List<CurvePresetPoint>
+                    {
+                        new CurvePresetPoint { Time = 0f, Value = 0f, TangentIn = 0f, TangentOut = 0f },
+                        new CurvePresetPoint { Time = 1f, Value = 1f, TangentIn = 0f, TangentOut = 0f },
+                    }
+                }
+            },
+        };
+
         /// <summary>
         /// The keyframe UI points.
         /// </summary>
@@ -568,6 +668,28 @@ namespace FlaxEditor.GUI
         /// <param name="indicesToRemove">The list of indices of the keyframes to remove.</param>
         protected abstract void RemoveKeyframesInternal(HashSet<int> indicesToRemove);
 
+        /// <summary>
+        /// Tries to convert a float to the type of the type wildcard of the curve editor.
+        /// </summary>
+        /// <param name="value">The float.</param>
+        /// <returns>The converted value.</returns>
+        public static object ConvertCurvePresetValueToCurveEditorType(float value)
+        {
+            if (typeof(T) == typeof(Float2))
+                return new Float2(value);
+            if (typeof(T) == typeof(Float3))
+                return new Float3(value);
+            if (typeof(T) == typeof(Float4))
+                return new Float4(value);
+            if (typeof(T) == typeof(Vector2))
+                return new Vector2(value);
+            if (typeof(T) == typeof(Vector3))
+                return new Vector3(value);
+            if (typeof(T) == typeof(Vector4))
+                return new Vector4(value);
+            return value;
+        }
+
         /// <summary>
         /// Called when showing a context menu. Can be used to add custom buttons with actions.
         /// </summary>
@@ -752,6 +874,17 @@ namespace FlaxEditor.GUI
             ShowCurve(false);
         }
 
+        /// <summary>
+        /// Applies a <see cref="CurvePreset"/> to the curve editor.
+        /// </summary>
+        /// <param name="preset">The preset.</param>
+        public virtual void ApplyPreset(CurvePreset preset)
+        {
+            // Remove existing keyframes
+            SelectAll();
+            RemoveKeyframes();
+        }
+
         /// <inheritdoc />
         public override void Evaluate(out object result, float time, bool loop = false)
         {
@@ -1028,6 +1161,31 @@ namespace FlaxEditor.GUI
                 return true;
             }
 
+            bool left = key == KeyboardKeys.ArrowLeft;
+            bool right = key == KeyboardKeys.ArrowRight;
+            bool up = key == KeyboardKeys.ArrowUp;
+            bool down = key == KeyboardKeys.ArrowDown;
+
+            if (left || right || up || down)
+            {
+                bool shift = Root.GetKey(KeyboardKeys.Shift);
+                bool alt = Root.GetKey(KeyboardKeys.Alt);
+                float deltaValue = 10f;
+                if (shift || alt)
+                    deltaValue = shift ? 2.5f : 5f;
+
+                Float2 moveDelta = Float2.Zero;
+                if (left || right)
+                    moveDelta.X = left ? -deltaValue : deltaValue;
+                if (up || down)
+                    moveDelta.Y = up ? -deltaValue : deltaValue;
+
+                _contents.OnMoveStart(Float2.Zero);
+                _contents.OnMove(moveDelta);
+                _contents.OnMoveEnd(Float2.Zero);
+                return true;
+            }
+
             return false;
         }
 
@@ -1526,6 +1684,22 @@ namespace FlaxEditor.GUI
                 _tangents[i].Visible = false;
         }
 
+        /// <inheritdoc />
+        public override void ApplyPreset(CurvePreset preset)
+        {
+            base.ApplyPreset(preset);
+
+            CurveEditorPreset data = Presets[preset];
+            foreach (var point in data.Points)
+            {
+                float time = point.Time;
+                object value = ConvertCurvePresetValueToCurveEditorType((float)point.Value);
+                AddKeyframe(time, value);
+            }
+
+            ShowWholeCurve();
+        }
+
         /// <inheritdoc />
         protected override void DrawCurve(ref Rectangle viewRect)
         {
@@ -2312,6 +2486,30 @@ namespace FlaxEditor.GUI
             }
         }
 
+        /// <inheritdoc />
+        public override void ApplyPreset(CurvePreset preset)
+        {
+            base.ApplyPreset(preset);
+
+            CurveEditorPreset data = Presets[preset];
+
+            foreach (var point in data.Points)
+            {
+                float time = point.Time;
+                object value = ConvertCurvePresetValueToCurveEditorType((float)point.Value);
+                object tangentIn = ConvertCurvePresetValueToCurveEditorType((float)point.TangentIn);
+                object tangentOut = ConvertCurvePresetValueToCurveEditorType((float)point.TangentOut);
+
+                AddKeyframe(time, value, tangentIn, tangentOut);
+            }
+
+            SelectAll();
+            if (data.LinearTangents)
+                SetTangentsLinear();
+
+            ShowWholeCurve();
+        }
+
         /// <inheritdoc />
         protected override void SetScaleInternal(ref Float2 scale)
         {

Source/Editor/GUI/Dialogs/ColorPickerDialog.cs

@@ -41,6 +41,7 @@ namespace FlaxEditor.GUI.Dialogs
         private bool _useDynamicEditing;
         private bool _activeEyedropper;
         private bool _canPassLastChangeEvent = true;
+        private bool _linear;
         private ColorValueBox.ColorPickerEvent _onChanged;
         private ColorValueBox.ColorPickerClosedEvent _onClosed;
 
@@ -56,6 +57,7 @@ namespace FlaxEditor.GUI.Dialogs
         private Button _cCancel;
         private Button _cOK;
         private Button _cEyedropper;
+        private Button _cLinearSRGB;
 
         private List<Color> _savedColors = new List<Color>();
         private List<Button> _savedColorButtons = new List<Button>();
@@ -118,6 +120,7 @@ namespace FlaxEditor.GUI.Dialogs
             _value = Color.Transparent;
             _onChanged = colorChanged;
             _onClosed = pickerClosed;
+            _linear = !Graphics.GammaColorSpace;
 
             // Get saved colors if they exist
             if (Editor.Instance.ProjectCache.TryGetCustomData("ColorPickerSavedColors", out string savedColors))
@@ -227,6 +230,25 @@ namespace FlaxEditor.GUI.Dialogs
             _cEyedropper.Width = _cEyedropper.Height;
             _cEyedropper.X -= _cEyedropper.Width;
 
+            // Linear/sRGB toggle button
+            _cLinearSRGB = new Button(_cOK.X - EyedropperMargin, _cHex.Bottom + PickerMargin)
+            {
+                TooltipText = "Toggles between color preview in Linear and sRGB",
+                BackgroundBrush = new SpriteBrush(Editor.Instance.Icons.SplineAligned64),
+                BackgroundColor = _cEyedropper.BackgroundColor,
+                BackgroundColorHighlighted = _cEyedropper.BackgroundColorHighlighted,
+                BorderColor = _linear ? Color.Transparent : style.Foreground,
+                BorderColorHighlighted = _cEyedropper.BorderColorHighlighted,
+                Size = _cEyedropper.Size,
+                Parent = this,
+                Location = _cEyedropper.BottomLeft + new Float2(0, 4),
+            };
+            _cLinearSRGB.Clicked += () =>
+            {
+                _linear = !_linear;
+                _cLinearSRGB.BorderColor = _linear ? Color.Transparent : style.Foreground;
+            };
+
             // Set initial color
             SelectedColor = initialValue;
         }
@@ -281,16 +303,22 @@ namespace FlaxEditor.GUI.Dialogs
             if (_activeEyedropper)
             {
                 _activeEyedropper = false;
-                SelectedColor = colorPicked;
+                if (colorPicked != Color.Transparent)
-                ScreenUtilities.PickColorDone -= OnColorPicked;
+                {
+                    Color color = colorPicked;
+                    if (_linear)
+                        color = color.ToLinear();
+                    SelectedColor = color;
+                }
+                Platform.PickScreenColorDone -= OnColorPicked;
             }
         }
 
         private void OnEyedropStart()
         {
             _activeEyedropper = true;
-            ScreenUtilities.PickColor();
+            Platform.PickScreenColor();
-            ScreenUtilities.PickColorDone += OnColorPicked;
+            Platform.PickScreenColorDone += OnColorPicked;
         }
 
         private void OnRGBAChanged()
@@ -326,8 +354,15 @@ namespace FlaxEditor.GUI.Dialogs
             // Update eye dropper tool
             if (_activeEyedropper)
             {
+                // Try reading the color under the cursor in realtime if supported by the platform
                 Float2 mousePosition = Platform.MousePosition;
-                SelectedColor = ScreenUtilities.GetColorAt(mousePosition);
+                Color color = Platform.GetScreenColorAt(mousePosition);
+                if (color != Color.Transparent)
+                {
+                    if (_linear)
+                        color = color.ToLinear();
+                    SelectedColor = color;
+                }
             }
         }
 
@@ -388,7 +423,7 @@ namespace FlaxEditor.GUI.Dialogs
                     }
                 }
             }
-            Render2D.FillRectangle(newRect, _value);
+            Render2D.FillRectangle(newRect, _linear ? _value.ToSRgb() : _value);
         }
 
         /// <inheritdoc />
@@ -409,7 +444,7 @@ namespace FlaxEditor.GUI.Dialogs
             {
                 // Cancel eye dropping
                 _activeEyedropper = false;
-                ScreenUtilities.PickColorDone -= OnColorPicked;
+                Platform.PickScreenColorDone -= OnColorPicked;
                 return true;
             }
 

Source/Editor/GUI/Dialogs/ColorSelector.cs

@@ -310,6 +310,26 @@ namespace FlaxEditor.GUI.Dialogs
             Render2D.DrawRectangle(_slider1Rect, _isMouseDownSlider1 ? style.BackgroundSelected : Color.Black);
             Render2D.DrawRectangle(valueR, _isMouseDownSlider1 ? Color.White : Color.Gray);
 
+            // Draw checkerboard pattern to part of the alpha slider background
+            var alphaRect = _slider2Rect;
+            Render2D.FillRectangle(alphaRect, Color.White);
+            var smallRectSize = alphaRect.Width * 0.5f;
+            var numHor = Mathf.CeilToInt(alphaRect.Width / smallRectSize);
+            var numVer = Mathf.CeilToInt(alphaRect.Height / smallRectSize);
+            for (int i = 0; i < numHor; i++)
+            {
+                for (int j = 0; j < numVer; j++)
+                {
+                    if ((i + j) % 2 == 0)
+                    {
+                        var rect = new Rectangle(alphaRect.X + smallRectSize * i, alphaRect.Y + smallRectSize * j, new Float2(smallRectSize));
+                        Render2D.PushClip(alphaRect);
+                        Render2D.FillRectangle(rect, Color.Gray);
+                        Render2D.PopClip();
+                    }
+                }
+            }
+
             // Alpha
             float alphaY = _slider2Rect.Height * (1 - _color.A);
             var alphaR = new Rectangle(_slider2Rect.X - slidersOffset, _slider2Rect.Y + alphaY - slidersThickness / 2, _slider2Rect.Width + slidersOffset * 2, slidersThickness);

Source/Editor/GUI/Docking/DockHintWindow.cs

@@ -1,545 +0,0 @@
-// Copyright (c) Wojciech Figat. All rights reserved.
-
-using System;
-using FlaxEngine;
-using FlaxEngine.GUI;
-
-namespace FlaxEditor.GUI.Docking
-{
-    /// <summary>
-    /// Helper class used to handle docking windows dragging and docking.
-    /// </summary>
-    public class DockHintWindow
-    {
-        private FloatWindowDockPanel _toMove;
-
-        private Float2 _dragOffset;
-        private Float2 _defaultWindowSize;
-        private Rectangle _rectDock;
-        private Rectangle _rectWindow;
-        private Float2 _mouse;
-        private DockState _toSet;
-        private DockPanel _toDock;
-        private bool _lateDragOffsetUpdate;
-
-        private Rectangle _rLeft, _rRight, _rBottom, _rUpper, _rCenter;
-
-        private DockHintWindow(FloatWindowDockPanel toMove)
-        {
-            _toMove = toMove;
-            _toSet = DockState.Float;
-            var window = toMove.Window.Window;
-
-            // Remove focus from drag target
-            _toMove.Focus();
-            _toMove.Defocus();
-
-            // Focus window
-            window.Focus();
-
-            // Check if window is maximized and restore window.
-            if (window.IsMaximized)
-            {
-                // Restore window and set position to mouse.
-                var mousePos = window.MousePosition;
-                var previousSize = window.Size;
-                window.Restore();
-                window.Position = Platform.MousePosition - mousePos * window.Size / previousSize;
-            }
-
-            // Calculate dragging offset and move window to the destination position
-            var mouseScreenPosition = Platform.MousePosition;
-
-            // If the _toMove window was not focused when initializing this window, the result vector only contains zeros
-            // and to prevent a failure, we need to perform an update for the drag offset at later time which will be done in the OnMouseMove event handler.
-            if (mouseScreenPosition != Float2.Zero)
-                CalculateDragOffset(mouseScreenPosition);
-            else
-                _lateDragOffsetUpdate = true;
-
-            // Get initial size
-            _defaultWindowSize = window.Size;
-
-            // Init proxy window
-            Proxy.Init(ref _defaultWindowSize);
-
-            // Bind events
-            Proxy.Window.MouseUp += OnMouseUp;
-            Proxy.Window.MouseMove += OnMouseMove;
-            Proxy.Window.LostFocus += OnLostFocus;
-
-            // Start tracking mouse
-            Proxy.Window.StartTrackingMouse(false);
-
-            // Update window GUI
-            Proxy.Window.GUI.PerformLayout();
-
-            // Update rectangles
-            UpdateRects();
-
-            // Hide base window
-            window.Hide();
-
-            // Enable hit window presentation
-            Proxy.Window.RenderingEnabled = true;
-            Proxy.Window.Show();
-            Proxy.Window.Focus();
-        }
-
-        /// <summary>
-        /// Releases unmanaged and - optionally - managed resources.
-        /// </summary>
-        public void Dispose()
-        {
-            // End tracking mouse
-            Proxy.Window.EndTrackingMouse();
-
-            // Disable rendering
-            Proxy.Window.RenderingEnabled = false;
-
-            // Unbind events
-            Proxy.Window.MouseUp -= OnMouseUp;
-            Proxy.Window.MouseMove -= OnMouseMove;
-            Proxy.Window.LostFocus -= OnLostFocus;
-
-            // Hide the proxy
-            Proxy.Hide();
-
-            if (_toMove == null)
-                return;
-
-            // Check if window won't be docked
-            if (_toSet == DockState.Float)
-            {
-                var window = _toMove.Window?.Window;
-                if (window == null)
-                    return;
-                var mouse = Platform.MousePosition;
-
-                // Move base window
-                window.Position = mouse - _dragOffset;
-
-                // Show base window
-                window.Show();
-            }
-            else
-            {
-                bool hasNoChildPanels = _toMove.ChildPanelsCount == 0;
-
-                // Check if window has only single tab
-                if (hasNoChildPanels && _toMove.TabsCount == 1)
-                {
-                    // Dock window
-                    _toMove.GetTab(0).Show(_toSet, _toDock);
-                }
-                // Check if dock as tab and has no child panels
-                else if (hasNoChildPanels && _toSet == DockState.DockFill)
-                {
-                    // Dock all tabs
-                    while (_toMove.TabsCount > 0)
-                    {
-                        _toMove.GetTab(0).Show(DockState.DockFill, _toDock);
-                    }
-                }
-                else
-                {
-                    var selectedTab = _toMove.SelectedTab;
-
-                    // Dock the first tab into the target location
-                    var firstTab = _toMove.GetTab(0);
-                    firstTab.Show(_toSet, _toDock);
-
-                    // Dock rest of the tabs
-                    while (_toMove.TabsCount > 0)
-                    {
-                        _toMove.GetTab(0).Show(DockState.DockFill, firstTab);
-                    }
-
-                    // Keep selected tab being selected
-                    selectedTab?.SelectTab();
-                }
-
-                // Focus target window
-                _toDock.Root.Focus();
-            }
-
-            _toMove = null;
-        }
-
-        /// <summary>
-        /// Creates the new dragging hit window.
-        /// </summary>
-        /// <param name="toMove">Floating dock panel to move.</param>
-        /// <returns>The dock hint window object.</returns>
-        public static DockHintWindow Create(FloatWindowDockPanel toMove)
-        {
-            if (toMove == null)
-                throw new ArgumentNullException();
-
-            return new DockHintWindow(toMove);
-        }
-
-        /// <summary>
-        /// Creates the new dragging hit window.
-        /// </summary>
-        /// <param name="toMove">Dock window to move.</param>
-        /// <returns>The dock hint window object.</returns>
-        public static DockHintWindow Create(DockWindow toMove)
-        {
-            if (toMove == null)
-                throw new ArgumentNullException();
-
-            // Show floating
-            toMove.ShowFloating();
-
-            // Move window to the mouse position (with some offset for caption bar)
-            var window = (WindowRootControl)toMove.Root;
-            var mouse = Platform.MousePosition;
-            window.Window.Position = mouse - new Float2(8, 8);
-
-            // Get floating panel
-            var floatingPanelToMove = window.GetChild(0) as FloatWindowDockPanel;
-
-            return new DockHintWindow(floatingPanelToMove);
-        }
-
-        /// <summary>
-        /// Calculates window rectangle in the dock window.
-        /// </summary>
-        /// <param name="state">Window dock state.</param>
-        /// <param name="rect">Dock panel rectangle.</param>
-        /// <returns>Calculated window rectangle.</returns>
-        public static Rectangle CalculateDockRect(DockState state, ref Rectangle rect)
-        {
-            Rectangle result = rect;
-            switch (state)
-            {
-            case DockState.DockFill:
-                result.Location.Y += Editor.Instance.Options.Options.Interface.TabHeight;
-                result.Size.Y -= Editor.Instance.Options.Options.Interface.TabHeight;
-                break;
-            case DockState.DockTop:
-                result.Size.Y *= DockPanel.DefaultSplitterValue;
-                break;
-            case DockState.DockLeft:
-                result.Size.X *= DockPanel.DefaultSplitterValue;
-                break;
-            case DockState.DockBottom:
-                result.Location.Y += result.Size.Y * (1 - DockPanel.DefaultSplitterValue);
-                result.Size.Y *= DockPanel.DefaultSplitterValue;
-                break;
-            case DockState.DockRight:
-                result.Location.X += result.Size.X * (1 - DockPanel.DefaultSplitterValue);
-                result.Size.X *= DockPanel.DefaultSplitterValue;
-                break;
-            }
-            return result;
-        }
-
-        private void CalculateDragOffset(Float2 mouseScreenPosition)
-        {
-            var baseWinPos = _toMove.Window.Window.Position;
-            _dragOffset = mouseScreenPosition - baseWinPos;
-        }
-
-        private void UpdateRects()
-        {
-            // Cache mouse position
-            _mouse = Platform.MousePosition;
-
-            // Check intersection with any dock panel
-            var uiMouse = _mouse;
-            _toDock = _toMove.MasterPanel.HitTest(ref uiMouse, _toMove);
-
-            // Check dock state to use
-            bool showProxyHints = _toDock != null;
-            bool showBorderHints = showProxyHints;
-            bool showCenterHint = showProxyHints;
-            if (showProxyHints)
-            {
-                // If moved window has not only tabs but also child panels disable docking as tab
-                if (_toMove.ChildPanelsCount > 0)
-                    showCenterHint = false;
-
-                // Disable docking windows with one or more dock panels inside
-                if (_toMove.ChildPanelsCount > 0)
-                    showBorderHints = false;
-
-                // Get dock area
-                _rectDock = _toDock.DockAreaBounds;
-
-                // Cache dock rectangles
-                var size = _rectDock.Size;
-                var offset = _rectDock.Location;
-                var borderMargin = 4.0f;
-                var hintWindowsSize = Proxy.HintWindowsSize * Platform.DpiScale;
-                var hintWindowsSize2 = hintWindowsSize * 0.5f;
-                var centerX = size.X * 0.5f;
-                var centerY = size.Y * 0.5f;
-                _rUpper = new Rectangle(centerX - hintWindowsSize2, borderMargin, hintWindowsSize, hintWindowsSize) + offset;
-                _rBottom = new Rectangle(centerX - hintWindowsSize2, size.Y - hintWindowsSize - borderMargin, hintWindowsSize, hintWindowsSize) + offset;
-                _rLeft = new Rectangle(borderMargin, centerY - hintWindowsSize2, hintWindowsSize, hintWindowsSize) + offset;
-                _rRight = new Rectangle(size.X - hintWindowsSize - borderMargin, centerY - hintWindowsSize2, hintWindowsSize, hintWindowsSize) + offset;
-                _rCenter = new Rectangle(centerX - hintWindowsSize2, centerY - hintWindowsSize2, hintWindowsSize, hintWindowsSize) + offset;
-
-                // Hit test
-                DockState toSet = DockState.Float;
-                if (showBorderHints)
-                {
-                    if (_rUpper.Contains(_mouse))
-                        toSet = DockState.DockTop;
-                    else if (_rBottom.Contains(_mouse))
-                        toSet = DockState.DockBottom;
-                    else if (_rLeft.Contains(_mouse))
-                        toSet = DockState.DockLeft;
-                    else if (_rRight.Contains(_mouse))
-                        toSet = DockState.DockRight;
-                }
-                if (showCenterHint && _rCenter.Contains(_mouse))
-                    toSet = DockState.DockFill;
-                _toSet = toSet;
-
-                // Show proxy hint windows
-                Proxy.Down.Position = _rBottom.Location;
-                Proxy.Left.Position = _rLeft.Location;
-                Proxy.Right.Position = _rRight.Location;
-                Proxy.Up.Position = _rUpper.Location;
-                Proxy.Center.Position = _rCenter.Location;
-            }
-            else
-            {
-                _toSet = DockState.Float;
-            }
-
-            // Update proxy hint windows visibility
-            Proxy.Down.IsVisible = showProxyHints & showBorderHints;
-            Proxy.Left.IsVisible = showProxyHints & showBorderHints;
-            Proxy.Right.IsVisible = showProxyHints & showBorderHints;
-            Proxy.Up.IsVisible = showProxyHints & showBorderHints;
-            Proxy.Center.IsVisible = showProxyHints & showCenterHint;
-
-            // Calculate proxy/dock/window rectangles
-            if (_toDock == null)
-            {
-                // Floating window over nothing
-                _rectWindow = new Rectangle(_mouse - _dragOffset, _defaultWindowSize);
-            }
-            else
-            {
-                if (_toSet == DockState.Float)
-                {
-                    // Floating window over dock panel
-                    _rectWindow = new Rectangle(_mouse - _dragOffset, _defaultWindowSize);
-                }
-                else
-                {
-                    // Use only part of the dock panel to show hint
-                    _rectWindow = CalculateDockRect(_toSet, ref _rectDock);
-                }
-            }
-
-            // Update proxy window
-            Proxy.Window.ClientBounds = _rectWindow;
-        }
-
-        private void OnMouseUp(ref Float2 location, MouseButton button, ref bool handled)
-        {
-            if (button == MouseButton.Left)
-            {
-                Dispose();
-            }
-        }
-
-        private void OnMouseMove(ref Float2 mousePos)
-        {
-            // Recalculate the drag offset because the current mouse screen position was invalid when we initialized the window
-            if (_lateDragOffsetUpdate)
-            {
-                // Calculate dragging offset and move window to the destination position
-                CalculateDragOffset(mousePos);
-
-                // Reset state
-                _lateDragOffsetUpdate = false;
-            }
-
-            UpdateRects();
-        }
-
-        private void OnLostFocus()
-        {
-            Dispose();
-        }
-
-        /// <summary>
-        /// Contains helper proxy windows shared across docking panels. They are used to visualize docking window locations.
-        /// </summary>
-        public static class Proxy
-        {
-            /// <summary>
-            /// The drag proxy window.
-            /// </summary>
-            public static Window Window;
-
-            /// <summary>
-            /// The left hint proxy window.
-            /// </summary>
-            public static Window Left;
-
-            /// <summary>
-            /// The right hint proxy window.
-            /// </summary>
-            public static Window Right;
-
-            /// <summary>
-            /// The up hint proxy window.
-            /// </summary>
-            public static Window Up;
-
-            /// <summary>
-            /// The down hint proxy window.
-            /// </summary>
-            public static Window Down;
-
-            /// <summary>
-            /// The center hint proxy window.
-            /// </summary>
-            public static Window Center;
-
-            /// <summary>
-            /// The hint windows size.
-            /// </summary>
-            public const float HintWindowsSize = 32.0f;
-
-            /// <summary>
-            /// Initializes the hit proxy windows. Those windows are used to indicate drag target areas (left, right, top, bottom, etc.).
-            /// </summary>
-            public static void InitHitProxy()
-            {
-                CreateProxy(ref Left, "DockHint.Left");
-                CreateProxy(ref Right, "DockHint.Right");
-                CreateProxy(ref Up, "DockHint.Up");
-                CreateProxy(ref Down, "DockHint.Down");
-                CreateProxy(ref Center, "DockHint.Center");
-            }
-
-            /// <summary>
-            /// Initializes the hint window.
-            /// </summary>
-            /// <param name="initSize">Initial size of the proxy window.</param>
-            public static void Init(ref Float2 initSize)
-            {
-                if (Window == null)
-                {
-                    var settings = CreateWindowSettings.Default;
-                    settings.Title = "DockHint.Window";
-                    settings.Size = initSize;
-                    settings.AllowInput = true;
-                    settings.AllowMaximize = false;
-                    settings.AllowMinimize = false;
-                    settings.HasBorder = false;
-                    settings.HasSizingFrame = false;
-                    settings.IsRegularWindow = false;
-                    settings.SupportsTransparency = true;
-                    settings.ShowInTaskbar = false;
-                    settings.ShowAfterFirstPaint = false;
-                    settings.IsTopmost = true;
-
-                    Window = Platform.CreateWindow(ref settings);
-                    Window.Opacity = 0.6f;
-                    Window.GUI.BackgroundColor = Style.Current.Selection;
-                    Window.GUI.AddChild<DragVisuals>();
-                }
-                else
-                {
-                    // Resize proxy
-                    Window.ClientSize = initSize;
-                }
-
-                InitHitProxy();
-            }
-
-            private sealed class DragVisuals : Control
-            {
-                public DragVisuals()
-                {
-                    AnchorPreset = AnchorPresets.StretchAll;
-                    Offsets = Margin.Zero;
-                }
-
-                public override void Draw()
-                {
-                    Render2D.DrawRectangle(new Rectangle(Float2.Zero, Size), Style.Current.SelectionBorder);
-                }
-            }
-
-            private static void CreateProxy(ref Window win, string name)
-            {
-                if (win != null)
-                    return;
-
-                var settings = CreateWindowSettings.Default;
-                settings.Title = name;
-                settings.Size = new Float2(HintWindowsSize * Platform.DpiScale);
-                settings.AllowInput = false;
-                settings.AllowMaximize = false;
-                settings.AllowMinimize = false;
-                settings.HasBorder = false;
-                settings.HasSizingFrame = false;
-                settings.IsRegularWindow = false;
-                settings.SupportsTransparency = true;
-                settings.ShowInTaskbar = false;
-                settings.ActivateWhenFirstShown = false;
-                settings.IsTopmost = true;
-                settings.ShowAfterFirstPaint = false;
-
-                win = Platform.CreateWindow(ref settings);
-                win.Opacity = 0.6f;
-                win.GUI.BackgroundColor = Style.Current.Selection;
-                win.GUI.AddChild<DragVisuals>();
-            }
-
-            /// <summary>
-            /// Hides proxy windows.
-            /// </summary>
-            public static void Hide()
-            {
-                HideProxy(ref Window);
-                HideProxy(ref Left);
-                HideProxy(ref Right);
-                HideProxy(ref Up);
-                HideProxy(ref Down);
-                HideProxy(ref Center);
-            }
-
-            private static void HideProxy(ref Window win)
-            {
-                if (win)
-                {
-                    win.Hide();
-                }
-            }
-
-            /// <summary>
-            /// Releases proxy data and windows.
-            /// </summary>
-            public static void Dispose()
-            {
-                DisposeProxy(ref Window);
-                DisposeProxy(ref Left);
-                DisposeProxy(ref Right);
-                DisposeProxy(ref Up);
-                DisposeProxy(ref Down);
-                DisposeProxy(ref Center);
-            }
-
-            private static void DisposeProxy(ref Window win)
-            {
-                if (win)
-                {
-                    win.Close(ClosingReason.User);
-                    win = null;
-                }
-            }
-        }
-    }
-}

Source/Editor/GUI/Docking/DockPanel.cs

@@ -469,7 +469,7 @@ namespace FlaxEditor.GUI.Docking
                     var childPanels = _childPanels.ToArray();
                     if (childPanels.Length != 0)
                     {
-                        // Move tabs from child panels into this one
+                        // Fallback: move tabs from child panels into this one.
                         DockWindow selectedTab = null;
                         foreach (var childPanel in childPanels)
                         {
@@ -490,7 +490,8 @@ namespace FlaxEditor.GUI.Docking
                     {
                         // Unlink splitter
                         var splitterParent = splitter.Parent;
-                        Assert.IsNotNull(splitterParent);
+                        if (splitterParent == null)
+                            return;
                         splitter.Parent = null;
 
                         // Move controls from second split panel to the split panel parent
@@ -507,17 +508,63 @@ namespace FlaxEditor.GUI.Docking
                         splitter.Dispose();
                     }
                 }
+                else if (IsMaster && _childPanels.Count != 0)
+                {
+                    if (TryCollapseSplitter(_tabsProxy?.Parent as Panel))
+                        return;
+                }
                 else if (!IsMaster)
                 {
                     throw new InvalidOperationException();
                 }
             }
+            else if (_childPanels.Count != 0)
+            {
+                if (TryCollapseSplitter(_tabsProxy?.Parent as Panel))
+                    return;
+            }
             else if (!IsMaster)
             {
                 throw new InvalidOperationException();
             }
         }
 
+        internal bool CollapseEmptyTabsProxy()
+        {
+            if (TabsCount == 0 && ChildPanelsCount > 0)
+            {
+                return TryCollapseSplitter(_tabsProxy?.Parent as Panel);
+            }
+            return false;
+        }
+
+        private bool TryCollapseSplitter(Panel removedPanelParent)
+        {
+            if (removedPanelParent == null)
+                return false;
+            if (!(removedPanelParent.Parent is SplitPanel tabsSplitter))
+                return false;
+
+            var splitterParent = tabsSplitter.Parent;
+            if (splitterParent == null)
+                return false;
+            tabsSplitter.Parent = null;
+
+            var scrPanel = removedPanelParent == tabsSplitter.Panel2 ? tabsSplitter.Panel1 : tabsSplitter.Panel2;
+            var srcPanelChildrenCount = scrPanel.ChildrenCount;
+            for (int i = srcPanelChildrenCount - 1; i >= 0 && scrPanel.ChildrenCount > 0; i--)
+            {
+                scrPanel.GetChild(i).Parent = splitterParent;
+            }
+            Assert.IsTrue(scrPanel.ChildrenCount == 0);
+            Assert.IsTrue(splitterParent.ChildrenCount == srcPanelChildrenCount);
+
+            tabsSplitter.Dispose();
+            if (_tabsProxy != null && _tabsProxy.Parent == removedPanelParent)
+                _tabsProxy = null;
+            return true;
+        }
+
         internal virtual void DockWindowInternal(DockState state, DockWindow window, bool autoSelect = true, float? splitterValue = null)
         {
             DockWindow(state, window, autoSelect, splitterValue);

Source/Editor/GUI/Docking/DockPanelProxy.cs

@@ -19,11 +19,7 @@ namespace FlaxEditor.GUI.Docking
         private float _tabHeight = Editor.Instance.Options.Options.Interface.TabHeight;
         private bool _useMinimumTabWidth = Editor.Instance.Options.Options.Interface.UseMinimumTabWidth;
         private float _minimumTabWidth = Editor.Instance.Options.Options.Interface.MinimumTabWidth;
-#if PLATFORM_WINDOWS
+        private readonly bool _hideTabForSingleTab = Utilities.Utils.HideSingleTabWindowTabBars();
-        private readonly bool _hideTabForSingleTab = Editor.Instance.Options.Options.Interface.HideSingleTabWindowTabBars;
-#else
-        private readonly bool _hideTabForSingleTab = false;
-#endif
 
         /// <summary>
         /// The is mouse down flag (left button).
@@ -55,6 +51,11 @@ namespace FlaxEditor.GUI.Docking
         /// </summary>
         public Float2 MousePosition = Float2.Minimum;
 
+        /// <summary>
+        /// The mouse position.
+        /// </summary>
+        public Float2 MouseStartPosition = Float2.Minimum;
+
         /// <summary>
         /// The start drag asynchronous window.
         /// </summary>
@@ -196,7 +197,7 @@ namespace FlaxEditor.GUI.Docking
                 if (_panel.ChildPanelsCount == 0 && _panel.TabsCount == 1 && _panel.IsFloating)
                 {
                     // Create docking hint window but in an async manner
-                    DockHintWindow.Create(_panel as FloatWindowDockPanel);
+                    WindowDragHelper.StartDragging(_panel as FloatWindowDockPanel);
                 }
                 else
                 {
@@ -207,7 +208,7 @@ namespace FlaxEditor.GUI.Docking
                     _panel.SelectTab(index - 1);
 
                     // Create docking hint window
-                    DockHintWindow.Create(win);
+                    WindowDragHelper.StartDragging(win, _panel.RootWindow.Window);
                 }
             }
         }
@@ -393,6 +394,7 @@ namespace FlaxEditor.GUI.Docking
             if (IsSingleFloatingWindow)
                 return base.OnMouseDown(location, button);
             MouseDownWindow = GetTabAtPos(location, out IsMouseDownOverCross);
+            MouseStartPosition = location;
 
             // Check buttons
             if (button == MouseButton.Left)
@@ -479,6 +481,20 @@ namespace FlaxEditor.GUI.Docking
                         StartDrag(MouseDownWindow);
                     MouseDownWindow = null;
                 }
+                // Check if single tab is tried to be moved
+                else if (MouseDownWindow != null && _panel.TabsCount <= 1)
+                {
+                    if ((MousePosition - MouseStartPosition).Length > 3)
+                    {
+                        // Clear flag
+                        IsMouseLeftButtonDown = false;
+
+                        // Check tab under the mouse
+                        if (!IsMouseDownOverCross && MouseDownWindow != null)
+                            StartDrag(MouseDownWindow);
+                        MouseDownWindow = null;
+                    }
+                }
                 // Check if has more than one tab to change order
                 else if (MouseDownWindow != null && _panel.TabsCount > 1)
                 {

Source/Editor/GUI/Docking/DockWindow.cs

@@ -182,6 +182,26 @@ namespace FlaxEditor.GUI.Docking
         /// <param name="size">Window size, set <see cref="Float2.Zero"/> to use default.</param>
         /// <param name="position">Window location.</param>
         public void ShowFloating(Float2 location, Float2 size, WindowStartPosition position = WindowStartPosition.CenterParent)
+        {
+            CreateFloating(location, size, position, true);
+        }
+
+        /// <summary>
+        /// Creates the window in a floating state.
+        /// </summary>
+        public void CreateFloating()
+        {
+            CreateFloating(Float2.Zero, Float2.Zero);
+        }
+
+        /// <summary>
+        /// Creates the window in a floating state.
+        /// </summary>
+        /// <param name="location">Window location.</param>
+        /// <param name="size">Window size, set <see cref="Float2.Zero"/> to use default.</param>
+        /// <param name="position">Window location.</param>
+        /// <param name="showWindow">Window visibility.</param>
+        public void CreateFloating(Float2 location, Float2 size, WindowStartPosition position = WindowStartPosition.CenterParent, bool showWindow = false)
         {
             Undock();
 
@@ -199,14 +219,17 @@ namespace FlaxEditor.GUI.Docking
             windowGUI.UnlockChildrenRecursive();
             windowGUI.PerformLayout();
 
-            // Show
+            if (showWindow)
-            window.Show();
+            {
-            window.BringToFront();
+                // Show
-            window.Focus();
+                window.Show();
-            OnShow();
+                window.BringToFront();
+                window.Focus();
+                OnShow();
 
-            // Perform layout again
+                // Perform layout again
-            windowGUI.PerformLayout();
+                windowGUI.PerformLayout();
+            }
         }
 
         /// <summary>

Source/Editor/GUI/Docking/FloatWindowDockPanel.cs

@@ -11,6 +11,42 @@ namespace FlaxEditor.GUI.Docking
     /// <seealso cref="DockPanel" />
     public class FloatWindowDockPanel : DockPanel
     {
+        private class FloatWindowDecorations : WindowDecorations
+        {
+            private FloatWindowDockPanel _panel;
+
+            public FloatWindowDecorations(FloatWindowDockPanel panel)
+            : base(panel.RootWindow)
+            {
+                _panel = panel;
+            }
+
+            /// <inheritdoc />
+            public override bool OnMouseDown(Float2 location, MouseButton button)
+            {
+                if (Title.Bounds.Contains(location) && button == MouseButton.Left)
+                {
+                    _panel.BeginDrag();
+                    return true;
+                }
+                return base.OnMouseDown(location, button);
+            }
+
+#if !PLATFORM_WINDOWS
+            /// <inheritdoc />
+            protected override WindowHitCodes OnHitTest(ref Float2 mouse)
+            {
+                var hit = base.OnHitTest(ref mouse);
+                if (hit == WindowHitCodes.Caption)
+                {
+                    // Override the system behaviour when interacting with the caption area
+                    hit = WindowHitCodes.Client;
+                }
+                return hit;
+            }
+#endif
+        }
+
         private MasterDockPanel _masterPanel;
         private WindowRootControl _window;
 
@@ -40,6 +76,26 @@ namespace FlaxEditor.GUI.Docking
             Parent = window;
             _window.Window.Closing += OnClosing;
             _window.Window.LeftButtonHit += OnLeftButtonHit;
+
+            if (Utilities.Utils.UseCustomWindowDecorations())
+            {
+                var decorations = Parent.AddChild(new FloatWindowDecorations(this));
+                decorations.SetAnchorPreset(AnchorPresets.HorizontalStretchTop, false);
+            }
+        }
+
+        /// <inheritdoc />
+        protected override void PerformLayoutBeforeChildren()
+        {
+            base.PerformLayoutBeforeChildren();
+
+            var decorations = Parent.GetChild<FloatWindowDecorations>();
+            if (decorations != null)
+            {
+                // Apply offset for the title bar
+                foreach (var child in Children)
+                    child.Bounds = child.Bounds with { Y = decorations.Height, Height = Parent.Height - decorations.Height };
+            }
         }
 
         /// <summary>
@@ -52,7 +108,11 @@ namespace FlaxEditor.GUI.Docking
                 return;
 
             // Create docking hint window
-            DockHintWindow.Create(this);
+            Window dragSourceWindow = null;
+#if !PLATFORM_SDL
+            dragSourceWindow = _window?.Window;
+#endif
+            WindowDragHelper.StartDragging(this, dragSourceWindow);
         }
 
         /// <summary>
@@ -71,23 +131,33 @@ namespace FlaxEditor.GUI.Docking
             settings.Title = title;
             settings.Size = size;
             settings.Position = location;
-            settings.MinimumSize = new Float2(1);
+            settings.MinimumSize = new Float2(100, 100);
             settings.MaximumSize = Float2.Zero; // Unlimited size
             settings.Fullscreen = false;
             settings.HasBorder = true;
+#if PLATFORM_SDL
+            settings.SupportsTransparency = true;
+#else
             settings.SupportsTransparency = false;
+#endif
             settings.ActivateWhenFirstShown = true;
             settings.AllowInput = true;
             settings.AllowMinimize = true;
             settings.AllowMaximize = true;
             settings.AllowDragAndDrop = true;
             settings.IsTopmost = false;
-            settings.IsRegularWindow = true;
+            settings.Type = WindowType.Regular;
             settings.HasSizingFrame = true;
             settings.ShowAfterFirstPaint = false;
             settings.ShowInTaskbar = true;
             settings.StartPosition = startPosition;
 
+            if (Utilities.Utils.UseCustomWindowDecorations())
+            {
+                settings.HasBorder = false;
+                //settings.HasSizingFrame = false;
+            }
+
             // Create window
             return Platform.CreateWindow(ref settings);
         }
@@ -151,7 +221,12 @@ namespace FlaxEditor.GUI.Docking
             base.OnSelectedTabChanged();
 
             if (_window != null && SelectedTab != null)
+            {
                 _window.Title = SelectedTab.Title;
+                var decorations = Parent.GetChild<FloatWindowDecorations>();
+                if (decorations != null)
+                    decorations.PerformLayout();
+            }
         }
 
         /// <inheritdoc />

Source/Editor/GUI/Docking/MasterDockPanel.cs

@@ -81,7 +81,6 @@ namespace FlaxEditor.GUI.Docking
         public DockPanel HitTest(ref Float2 position, FloatWindowDockPanel excluded)
         {
             // Check all floating windows
-            // TODO: gather windows order and take it into account when performing test
             for (int i = 0; i < FloatingPanels.Count; i++)
             {
                 var win = FloatingPanels[i];
@@ -94,9 +93,44 @@ namespace FlaxEditor.GUI.Docking
             }
 
             // Base
+            //if (!Root?.RootWindow.Window.IsFocused ?? false)
+            //    return null;
             return base.HitTest(ref position);
         }
 
+        /// <summary>
+        /// Performs hit test over dock panel.
+        /// </summary>
+        /// <param name="position">Window space position to test.</param>
+        /// <param name="excluded">Floating window to omit during searching (and all docked to that one).</param>
+        /// <param name="hitResults">Results of the hit test</param>
+        /// <returns>True if any dock panels were hit, otherwise false.</returns>
+        public bool HitTest(ref Float2 position, FloatWindowDockPanel excluded, out DockPanel[] hitResults)
+        {
+            // Check all floating windows
+            List<DockPanel> results = new(FloatingPanels.Count);
+            for (int i = 0; i < FloatingPanels.Count; i++)
+            {
+                var win = FloatingPanels[i];
+                if (win.Visible && win != excluded)
+                {
+                    var result = win.HitTest(ref position);
+                    if (result != null)
+                        results.Add(result);
+                }
+            }
+
+            // Base
+            //if (!Root?.RootWindow.Window.IsFocused ?? false)
+            //    return null;
+            var baseResult = base.HitTest(ref position);
+            if (baseResult != null)
+                results.Add(baseResult);
+
+            hitResults = results.ToArray();
+            return hitResults.Length > 0;
+        }
+
         internal void LinkWindow(DockWindow window)
         {
             // Add to the windows list

Source/Editor/GUI/Docking/WindowDragHelper.cs

@@ -0,0 +1,514 @@
+// Copyright (c) Wojciech Figat. All rights reserved.
+
+using System;
+using FlaxEngine;
+using FlaxEngine.GUI;
+
+namespace FlaxEditor.GUI.Docking
+{
+    /// <summary>
+    /// Helper class used to handle docking windows dragging and docking.
+    /// </summary>
+    public class WindowDragHelper
+    {
+        private FloatWindowDockPanel _toMove;
+
+        private Float2 _dragOffset;
+        private Rectangle _rectDock;
+        private Float2 _mouse;
+        private DockState _toSet;
+        private DockPanel _toDock;
+        private Window _dragSourceWindow;
+
+        private Rectangle _rLeft, _rRight, _rBottom, _rUpper, _rCenter;
+        private Control _dockHintDown, _dockHintUp, _dockHintLeft, _dockHintRight, _dockHintCenter;
+
+        /// <summary>
+        /// The hint control size.
+        /// </summary>
+        public const float HintControlSize = 48.0f;
+
+        /// <summary>
+        /// The opacity of the dragged window when hint controls are shown.
+        /// </summary>
+        public const float DragWindowOpacity = 0.4f;
+        
+        /// <summary>
+        /// Returns true if any windows are being dragged.
+        /// </summary>
+        public static bool IsDragActive { get; private set; }
+
+        private WindowDragHelper(FloatWindowDockPanel toMove, Window dragSourceWindow)
+        {
+            IsDragActive = true;
+            _toMove = toMove;
+            _toSet = DockState.Float;
+            var window = toMove.Window.Window;
+            var mousePos = Platform.MousePosition;
+
+            // Check if window is maximized and restore window for correct dragging
+            if (window.IsMaximized)
+            {
+                var windowMousePos = mousePos - window.Position;
+                var previousSize = window.Size;
+                window.Restore();
+                window.Position = mousePos - windowMousePos * window.Size / previousSize;
+            }
+
+            // When drag starts from a tabs the window might not be shown yet
+            if (!window.IsVisible)
+            {
+                window.Show();
+                window.Position = mousePos - new Float2(40, 10);
+            }
+
+            // Bind events
+            FlaxEngine.Scripting.Update += OnUpdate;
+            window.MouseUp += OnMouseUp;
+#if !PLATFORM_SDL
+            window.StartTrackingMouse(false);
+#endif
+
+            // Update rectangles
+            UpdateRects(mousePos);
+            
+            // Ensure the dragged window stays on top of every other window
+            window.IsAlwaysOnTop = true;
+
+            _dragSourceWindow = dragSourceWindow;
+            if (_dragSourceWindow != null) // Detaching a tab from existing window
+            {
+#if PLATFORM_SDL
+                _dragOffset = new Float2(window.Size.X / 2, 10.0f);
+#else
+                _dragOffset = mousePos - window.Position;
+#endif
+
+                // The mouse up event is sent to the source window on Windows
+                _dragSourceWindow.MouseUp += OnMouseUp;
+
+                // TODO: when detaching tab in floating window (not main window), the drag source window is still main window?
+                var dragSourceWindowWayland = toMove.MasterPanel?.RootWindow.Window ?? Editor.Instance.Windows.MainWindow;
+                window.DoDragDrop(window.Title, _dragOffset, dragSourceWindowWayland);
+#if !PLATFORM_SDL
+                _dragSourceWindow.BringToFront();
+#endif
+            }
+            else
+            {
+                _dragOffset = window.MousePosition;
+                window.DoDragDrop(window.Title, _dragOffset, window);
+            }
+        }
+
+        /// <summary>
+        /// Releases unmanaged and - optionally - managed resources.
+        /// </summary>
+        public void Dispose()
+        {
+            IsDragActive = false;
+            var window = _toMove?.Window?.Window;
+
+            // Unbind events
+            FlaxEngine.Scripting.Update -= OnUpdate;
+            if (window != null)
+            {
+                window.MouseUp -= OnMouseUp;
+#if !PLATFORM_SDL
+                window.EndTrackingMouse();
+#endif
+            }
+            if (_dragSourceWindow != null)
+                _dragSourceWindow.MouseUp -= OnMouseUp;
+
+            RemoveDockHints();
+
+            if (_toMove == null)
+                return;
+
+            if (window != null)
+            {
+                window.Opacity = 1.0f;
+                window.IsAlwaysOnTop = false;
+                window.BringToFront();
+            }
+
+            // Check if window won't be docked
+            if (_toSet == DockState.Float)
+            {
+                if (window == null)
+                    return;
+
+                // Show base window
+                window.Show();
+            }
+            else
+            {
+                bool hasNoChildPanels = _toMove.ChildPanelsCount == 0;
+
+                // Check if window has only single tab
+                if (hasNoChildPanels && _toMove.TabsCount == 1)
+                {
+                    // Dock window
+                    _toMove.GetTab(0).Show(_toSet, _toDock);
+                }
+                // Check if dock as tab and has no child panels
+                else if (hasNoChildPanels && _toSet == DockState.DockFill)
+                {
+                    // Dock all tabs
+                    while (_toMove.TabsCount > 0)
+                    {
+                        _toMove.GetTab(0).Show(DockState.DockFill, _toDock);
+                    }
+                }
+                else
+                {
+                    var selectedTab = _toMove.SelectedTab;
+
+                    // Dock the first tab into the target location
+                    if (_toMove.TabsCount > 0)
+                    {
+                        var firstTab = _toMove.GetTab(0);
+                        firstTab.Show(_toSet, _toDock);
+
+                        // Dock rest of the tabs
+                        while (_toMove.TabsCount > 0)
+                        {
+                            _toMove.GetTab(0).Show(DockState.DockFill, firstTab);
+                        }
+                    }
+
+                    // Keep selected tab being selected
+                    selectedTab?.SelectTab();
+                }
+
+                // Focus target window
+                _toDock.Root.Focus();
+            }
+
+            _toMove = null;
+        }
+
+        /// <summary>
+        /// Start dragging a floating dock panel.
+        /// </summary>
+        /// <param name="toMove">Floating dock panel to move.</param>
+        /// <param name="dragSourceWindow">The window where dragging started from.</param>
+        /// <returns>The window drag helper object.</returns>
+        public static WindowDragHelper StartDragging(FloatWindowDockPanel toMove, Window dragSourceWindow = null)
+        {
+            if (toMove == null)
+                throw new ArgumentNullException();
+
+            return new WindowDragHelper(toMove, dragSourceWindow);
+        }
+
+        /// <summary>
+        /// Start dragging a docked panel into a floating window.
+        /// </summary>
+        /// <param name="toMove">Dock window to move.</param>
+        /// <param name="dragSourceWindow">The window where dragging started from.</param>
+        /// <returns>The window drag helper object.</returns>
+        public static WindowDragHelper StartDragging(DockWindow toMove, Window dragSourceWindow)
+        {
+            if (toMove == null)
+                throw new ArgumentNullException();
+
+            // Create floating window
+            toMove.CreateFloating();
+
+            // Get floating panel
+            var window = (WindowRootControl)toMove.Root;
+            var floatingPanelToMove = window.GetChild(0) as FloatWindowDockPanel;
+
+            return new WindowDragHelper(floatingPanelToMove, dragSourceWindow);
+        }
+
+        private sealed class DragVisuals : Control
+        {
+            public DragVisuals()
+            {
+                AnchorPreset = AnchorPresets.StretchAll;
+                Offsets = Margin.Zero;
+            }
+
+            public override void Draw()
+            {
+                base.Draw();
+                Render2D.DrawRectangle(new Rectangle(Float2.Zero, Size), Style.Current.SelectionBorder);
+            }
+        }
+
+        private void AddDockHints()
+        {
+            if (_toDock == null)
+                return;
+
+            if (_toDock.RootWindow.Window != _dragSourceWindow)
+                _toDock.RootWindow.Window.MouseUp += OnMouseUp;
+
+            _dockHintDown = AddHintControl(new Float2(0.5f, 1));
+            _dockHintUp = AddHintControl(new Float2(0.5f, 0));
+            _dockHintLeft = AddHintControl(new Float2(0, 0.5f));
+            _dockHintRight = AddHintControl(new Float2(1, 0.5f));
+            _dockHintCenter = AddHintControl(new Float2(0.5f, 0.5f));
+
+            Control AddHintControl(Float2 pivot)
+            {
+                DragVisuals hintControl = _toDock.AddChild<DragVisuals>();
+                hintControl.Size = new Float2(HintControlSize);
+                hintControl.BackgroundColor = Style.Current.Selection.AlphaMultiplied(0.6f);
+                hintControl.Pivot = pivot;
+                hintControl.PivotRelative = true;
+                return hintControl;
+            }
+        }
+        
+        private void RemoveDockHints()
+        {
+            if (_toDock == null)
+                return;
+
+            if (_toDock.RootWindow.Window != _dragSourceWindow)
+                _toDock.RootWindow.Window.MouseUp -= OnMouseUp;
+
+            _dockHintDown?.Parent.RemoveChild(_dockHintDown);
+            _dockHintUp?.Parent.RemoveChild(_dockHintUp);
+            _dockHintLeft?.Parent.RemoveChild(_dockHintLeft);
+            _dockHintRight?.Parent.RemoveChild(_dockHintRight);
+            _dockHintCenter?.Parent.RemoveChild(_dockHintCenter);
+            _dockHintDown = _dockHintUp = _dockHintLeft = _dockHintRight = _dockHintCenter = null;
+        }
+
+        private void UpdateRects(Float2 mousePos)
+        {
+            // Cache mouse position
+            _mouse = mousePos;
+
+            // Check intersection with any dock panel
+            DockPanel dockPanel = null;
+            if (_toMove.MasterPanel.HitTest(ref _mouse, _toMove, out var hitResults))
+            {
+                dockPanel = hitResults[0];
+
+                // Prefer panel which currently has focus
+                foreach (var hit in hitResults)
+                {
+                    if (hit.RootWindow.Window.IsFocused)
+                    {
+                        dockPanel = hit;
+                        break;
+                    }
+                }
+
+                // Prefer panel in the same window we hit earlier
+                // TODO: this doesn't allow docking window into another floating window over the main window
+                /*if (dockPanel?.RootWindow != _toDock?.RootWindow)
+                {
+                    foreach (var hit in hitResults)
+                    {
+                        if (hit.RootWindow == _toDock?.RootWindow)
+                        {
+                            dockPanel = _toDock;
+                            break;
+                        }
+                    }
+                }*/
+            }
+            
+            if (dockPanel != _toDock)
+            {
+                RemoveDockHints();
+                _toDock = dockPanel;
+                AddDockHints();
+
+                // Make sure the all the dock hint areas are not under other windows
+                if (_toDock != Editor.Instance.UI.MasterPanel)
+                    _toDock?.RootWindow.Window.BringToFront();
+                //_toDock?.RootWindow.Window.Focus();
+
+#if PLATFORM_SDL
+                // Make the dragged window transparent when dock hints are visible
+                _toMove.Window.Window.Opacity = _toDock == null ? 1.0f : DragWindowOpacity;
+#else
+                // Bring the drop source always to the top
+                if (_dragSourceWindow != null)
+                    _dragSourceWindow.BringToFront();
+#endif
+            }
+
+            // Check dock state to use
+            bool showProxyHints = _toDock != null;
+            bool showBorderHints = showProxyHints;
+            bool showCenterHint = showProxyHints;
+            Control hoveredHintControl = null;
+            Float2 hoveredLocationOffset = Float2.Zero;
+            Float2 hoveredSizeOverride = Float2.Zero;
+            DockState prevToSet = _toSet;
+            float hoveredMargin = 1.0f;
+            if (showProxyHints)
+            {
+                // If moved window has not only tabs but also child panels disable docking as tab
+                if (_toMove.ChildPanelsCount > 0)
+                    showCenterHint = false;
+
+                // Disable docking windows with one or more dock panels inside
+                if (_toMove.ChildPanelsCount > 0)
+                    showBorderHints = false;
+
+                // Get dock area
+                _rectDock = _toDock.DockAreaBounds;
+
+                // Cache dock rectangles
+                var size = _rectDock.Size / Platform.DpiScale;
+                var offset = _toDock.PointFromScreen(_rectDock.Location);
+                var borderMargin = 10.0f;
+                var hintWindowsSize = HintControlSize;
+                var hintWindowsSize2 = hintWindowsSize * 0.5f;
+                var hintPreviewSize = new Float2(Math.Max(HintControlSize * 2, size.X * 0.5f), Math.Max(HintControlSize * 2, size.Y * 0.5f));
+                var centerX = size.X * 0.5f;
+                var centerY = size.Y * 0.5f;
+                _rUpper = new Rectangle(centerX - hintWindowsSize2, borderMargin, hintWindowsSize, hintWindowsSize) + offset;
+                _rBottom = new Rectangle(centerX - hintWindowsSize2, size.Y - hintWindowsSize - borderMargin, hintWindowsSize, hintWindowsSize) + offset;
+                _rLeft = new Rectangle(borderMargin, centerY - hintWindowsSize2, hintWindowsSize, hintWindowsSize) + offset;
+                _rRight = new Rectangle(size.X - hintWindowsSize - borderMargin, centerY - hintWindowsSize2, hintWindowsSize, hintWindowsSize) + offset;
+                _rCenter = new Rectangle(centerX - hintWindowsSize2, centerY - hintWindowsSize2, hintWindowsSize, hintWindowsSize) + offset;
+
+                // Hit test, and calculate the approximation for filled area when hovered over the hint
+                var toSet = DockState.Float;
+                var hintTestPoint = _toDock.PointFromScreen(_mouse);
+                if (showBorderHints)
+                {
+                    if (_rUpper.Contains(ref hintTestPoint))
+                    {
+                        toSet = DockState.DockTop;
+                        hoveredHintControl = _dockHintUp;
+                        hoveredSizeOverride = new Float2(size.X, size.Y * DockPanel.DefaultSplitterValue);
+                        hoveredLocationOffset.Y -= borderMargin - hoveredMargin;
+                    }
+                    else if (_rBottom.Contains(ref hintTestPoint))
+                    {
+                        toSet = DockState.DockBottom;
+                        hoveredHintControl = _dockHintDown;
+                        hoveredSizeOverride = new Float2(size.X, size.Y * DockPanel.DefaultSplitterValue);
+                        hoveredLocationOffset.Y += borderMargin - hoveredMargin;
+                    }
+                    else if (_rLeft.Contains(ref hintTestPoint))
+                    {
+                        toSet = DockState.DockLeft;
+                        hoveredHintControl = _dockHintLeft;
+                        hoveredSizeOverride = new Float2(size.X * DockPanel.DefaultSplitterValue, size.Y);
+                        hoveredLocationOffset.X -= borderMargin - hoveredMargin;
+                    }
+                    else if (_rRight.Contains(ref hintTestPoint))
+                    {
+                        toSet = DockState.DockRight;
+                        hoveredHintControl = _dockHintRight;
+                        hoveredSizeOverride = new Float2(size.X * DockPanel.DefaultSplitterValue, size.Y);
+                        hoveredLocationOffset.X += borderMargin - hoveredMargin;
+                    }
+                }
+                if (showCenterHint && _rCenter.Contains(ref hintTestPoint))
+                {
+                    toSet = DockState.DockFill;
+                    hoveredHintControl = _dockHintCenter;
+                    hoveredSizeOverride = new Float2(size.X, size.Y);
+                }
+
+                _toSet = toSet;
+            }
+            else
+            {
+                _toSet = DockState.Float;
+            }
+            
+            // Update sizes and opacity of hint controls
+            if (_toDock != null)
+            {
+                var mainColor = Style.Current.Selection;
+                if (hoveredHintControl != _dockHintDown)
+                {
+                    _dockHintDown.Size = new Float2(HintControlSize);
+                    _dockHintDown.BackgroundColor = mainColor.AlphaMultiplied(0.6f);
+                }
+                if (hoveredHintControl != _dockHintLeft)
+                {
+                    _dockHintLeft.Size = new Float2(HintControlSize);
+                    _dockHintLeft.BackgroundColor = mainColor.AlphaMultiplied(0.6f);
+                }
+                if (hoveredHintControl != _dockHintRight)
+                {
+                    _dockHintRight.Size = new Float2(HintControlSize);
+                    _dockHintRight.BackgroundColor = mainColor.AlphaMultiplied(0.6f);
+                }
+                if (hoveredHintControl != _dockHintUp)
+                {
+                    _dockHintUp.Size = new Float2(HintControlSize);
+                    _dockHintUp.BackgroundColor = mainColor.AlphaMultiplied(0.6f);
+                }
+                if (hoveredHintControl != _dockHintCenter)
+                {
+                    _dockHintCenter.Size = new Float2(HintControlSize);
+                    _dockHintCenter.BackgroundColor = mainColor.AlphaMultiplied(0.6f);
+                }
+
+                if (_toSet != DockState.Float)
+                {
+                    if (hoveredHintControl != null)
+                    {
+                        hoveredHintControl.BackgroundColor = mainColor;
+                        if (_toSet != prevToSet)
+                            hoveredHintControl.Location += hoveredLocationOffset;
+                        hoveredHintControl.Size = hoveredSizeOverride - hoveredMargin;
+                    }
+                }
+            }
+
+            // Update hint controls visibility and location
+            if (showProxyHints)
+            {
+                if (hoveredHintControl != _dockHintDown)
+                    _dockHintDown.Location = _rBottom.Location;
+                if (hoveredHintControl != _dockHintLeft)
+                    _dockHintLeft.Location = _rLeft.Location;
+                if (hoveredHintControl != _dockHintRight)
+                    _dockHintRight.Location = _rRight.Location;
+                if (hoveredHintControl != _dockHintUp)
+                    _dockHintUp.Location = _rUpper.Location;
+                if (hoveredHintControl != _dockHintCenter)
+                    _dockHintCenter.Location = _rCenter.Location;
+                
+                _dockHintDown.Visible = showProxyHints & showBorderHints;
+                _dockHintLeft.Visible = showProxyHints & showBorderHints;
+                _dockHintRight.Visible = showProxyHints & showBorderHints;
+                _dockHintUp.Visible = showProxyHints & showBorderHints;
+                _dockHintCenter.Visible = showProxyHints & showCenterHint;
+            }
+        }
+
+        private void OnMouseUp(ref Float2 location, MouseButton button, ref bool handled)
+        {
+            if (button == MouseButton.Left)
+                Dispose();
+        }
+
+        private void OnUpdate()
+        {
+            // If the engine lost focus during dragging, end the action
+            if (!Engine.HasFocus)
+            {
+                Dispose();
+                return;
+            }
+
+            var mousePos = Platform.MousePosition;
+            if (_mouse != mousePos)
+            {
+                if (_dragSourceWindow != null)
+                    _toMove.Window.Window.Position = mousePos - _dragOffset;
+
+                UpdateRects(mousePos);
+            }
+        }
+    }
+}

Source/Editor/GUI/EnumComboBox.cs

@@ -242,6 +242,15 @@ namespace FlaxEditor.GUI
         {
             FieldInfo[] fields = type.GetFields();
             entries.Capacity = Mathf.Max(fields.Length - 1, entries.Capacity);
+            if (formatMode == EnumDisplayAttribute.FormatMode.Default)
+            {
+                // Override display mode from enum itself
+                var attr = type.GetCustomAttribute<EnumDisplayAttribute>();
+                if (attr != null)
+                {
+                    formatMode = attr.Mode;
+                }
+            }
             for (int i = 0; i < fields.Length; i++)
             {
                 var field = fields[i];

Source/Editor/GUI/Input/ColorValueBox.cs

@@ -15,6 +15,7 @@ namespace FlaxEditor.GUI.Input
     public class ColorValueBox : Control
     {
         private bool _isMouseDown;
+        private bool _linear;
 
         /// <summary>
         /// Delegate function used for the color picker events handling.
@@ -101,6 +102,7 @@ namespace FlaxEditor.GUI.Input
         public ColorValueBox()
         : base(0, 0, 32, 18)
         {
+            _linear = !Graphics.GammaColorSpace;
         }
 
         /// <summary>
@@ -113,6 +115,7 @@ namespace FlaxEditor.GUI.Input
         : base(x, y, 32, 18)
         {
             _value = value;
+            _linear = !Graphics.GammaColorSpace;
         }
 
         /// <summary>
@@ -129,8 +132,10 @@ namespace FlaxEditor.GUI.Input
         {
             base.Draw();
 
-            bool isTransparent = _value.A < 1;
+            var value = _value;
-
+            if (_linear)
+                value = value.ToSRgb();
+            var isTransparent = value.A < 1;
             var style = Style.Current;
             var fullRect = new Rectangle(0, 0, Width, Height);
             var colorRect = new Rectangle(0, 0, isTransparent ? Width * 0.7f : Width, Height);
@@ -157,10 +162,10 @@ namespace FlaxEditor.GUI.Input
                         }
                     }
                 }
-                Render2D.FillRectangle(alphaRect, _value);
+                Render2D.FillRectangle(alphaRect, value);
             }
 
-            Render2D.FillRectangle(colorRect, _value with { A = 1 });
+            Render2D.FillRectangle(colorRect, value with { A = 1 });
             Render2D.DrawRectangle(fullRect, IsMouseOver || IsNavFocused ? style.BackgroundSelected : Color.Black);
         }
 

Source/Editor/GUI/Input/ValueBox.cs

@@ -99,6 +99,11 @@ namespace FlaxEditor.GUI.Input
         /// </summary>
         public event Action SlidingEnd;
 
+        /// <summary>
+        /// If enabled, pressing the arrow up or down key increments/ decrements the value.
+        /// </summary>
+        public bool ArrowKeysIncrement = true;
+
         /// <summary>
         /// Gets or sets the slider speed. Use value 0 to disable and hide slider UI.
         /// </summary>
@@ -239,6 +244,27 @@ namespace FlaxEditor.GUI.Input
             ResetViewOffset();
         }
 
+        /// <inheritdoc />
+        public override bool OnKeyDown(KeyboardKeys key)
+        {
+            if (ArrowKeysIncrement && (key == KeyboardKeys.ArrowUp || key == KeyboardKeys.ArrowDown))
+            {
+                bool altDown = Root.GetKey(KeyboardKeys.Alt);
+                bool shiftDown = Root.GetKey(KeyboardKeys.Shift);
+                bool controlDown = Root.GetKey(KeyboardKeys.Control);
+                float deltaValue = altDown ? 0.1f : (shiftDown ? 10f : (controlDown ? 100f : 1f));
+                float slideDelta = key == KeyboardKeys.ArrowUp ? deltaValue : -deltaValue;
+
+                _startSlideValue = Value;
+                ApplySliding(slideDelta);
+                EndSliding();
+                Focus();
+                return true;
+            }
+
+            return base.OnKeyDown(key);
+        }
+
         /// <inheritdoc />
         public override bool OnMouseDown(Float2 location, MouseButton button)
         {
@@ -266,6 +292,7 @@ namespace FlaxEditor.GUI.Input
             return base.OnMouseDown(location, button);
         }
 
+#if !PLATFORM_SDL
         /// <inheritdoc />
         public override void OnMouseMove(Float2 location)
         {
@@ -292,13 +319,45 @@ namespace FlaxEditor.GUI.Input
             base.OnMouseMove(location);
         }
 
+#else
+
+        /// <inheritdoc />
+        public override void OnMouseMoveRelative(Float2 motion)
+        {
+            var location = Root.TrackingMouseOffset;
+            if (_isSliding)
+            {
+                // Update sliding
+                ApplySliding(Root.TrackingMouseOffset.X * _slideSpeed);
+                return;
+            }
+
+            // Update cursor type so user knows they can slide value
+            if (CanUseSliding && SlideRect.Contains(location) && !_isSliding)
+            {
+                Cursor = CursorType.SizeWE;
+                _cursorChanged = true;
+            }
+            else if (_cursorChanged && !_isSliding)
+            {
+                Cursor = CursorType.Default;
+                _cursorChanged = false;
+            }
+
+            base.OnMouseMoveRelative(motion);
+        }
+
+#endif
+
         /// <inheritdoc />
         public override bool OnMouseUp(Float2 location, MouseButton button)
         {
             if (button == MouseButton.Left && _isSliding)
             {
+#if !PLATFORM_SDL
                 // End sliding and return mouse to original location
                 RootWindow.MousePosition = _mouseClickedPosition;
+#endif
                 EndSliding();
                 return true;
             }

Source/Editor/GUI/ItemsListContextMenu.cs

@@ -59,12 +59,12 @@ namespace FlaxEditor.GUI
             /// <summary>
             /// Occurs when items gets clicked by the user.
             /// </summary>
-            public event Action<Item> Clicked;
+            public event Action<Item> ItemClicked;
 
             /// <summary>
             /// Occurs when items gets focused.
             /// </summary>
-            public event Action<Item> Focused;
+            public event Action<Item> ItemFocused;
 
             /// <summary>
             /// The tint color of the text.
@@ -203,7 +203,7 @@ namespace FlaxEditor.GUI
                 if (button == MouseButton.Left && _isMouseDown)
                 {
                     _isMouseDown = false;
-                    Clicked?.Invoke(this);
+                    ItemClicked?.Invoke(this);
                 }
 
                 return base.OnMouseUp(location, button);
@@ -222,7 +222,7 @@ namespace FlaxEditor.GUI
             {
                 base.OnGotFocus();
 
-                Focused?.Invoke(this);
+                ItemFocused?.Invoke(this);
             }
 
             /// <inheritdoc />
@@ -434,7 +434,7 @@ namespace FlaxEditor.GUI
         /// <param name="item">The item.</param>
         public void AddItem(Item item)
         {
-            item.Clicked += OnClickItem;
+            item.ItemClicked += OnClickItem;
             ContainerControl parent = ItemsPanel;
             if (!string.IsNullOrEmpty(item.Category))
             {

Source/Editor/GUI/MainMenu.cs

@@ -12,16 +12,6 @@ namespace FlaxEditor.GUI
     /// <seealso cref="FlaxEngine.GUI.ContainerControl" />
     public sealed class MainMenu : ContainerControl
     {
-#if PLATFORM_WINDOWS
-        private bool _useCustomWindowSystem;
-        private Image _icon;
-        private Label _title;
-        private Button _closeButton;
-        private Button _minimizeButton;
-        private Button _maximizeButton;
-        private LocalizedString _charChromeRestore, _charChromeMaximize;
-        private Window _window;
-#endif
         private MainMenuButton _selected;
 
         /// <summary>
@@ -60,200 +50,12 @@ namespace FlaxEditor.GUI
         /// <summary>
         /// Initializes a new instance of the <see cref="MainMenu"/> class.
         /// </summary>
-        /// <param name="mainWindow">The main window.</param>
+        public MainMenu()
-        public MainMenu(RootControl mainWindow)
         : base(0, 0, 0, 20)
         {
             AutoFocus = false;
             AnchorPreset = AnchorPresets.HorizontalStretchTop;
-
+            BackgroundColor = Style.Current.LightBackground;
-#if PLATFORM_WINDOWS
-            _useCustomWindowSystem = !Editor.Instance.Options.Options.Interface.UseNativeWindowSystem;
-            if (_useCustomWindowSystem)
-            {
-                BackgroundColor = Style.Current.LightBackground;
-                Height = 28;
-
-                var windowIcon = FlaxEngine.Content.LoadAsyncInternal<Texture>(EditorAssets.WindowIcon);
-                FontAsset windowIconsFont = FlaxEngine.Content.LoadAsyncInternal<FontAsset>(EditorAssets.WindowIconsFont);
-                Font iconFont = windowIconsFont?.CreateFont(9);
-
-                _window = mainWindow.RootWindow.Window;
-                _window.HitTest += OnHitTest;
-                _window.Closed += OnWindowClosed;
-
-                ScriptsBuilder.GetBinariesConfiguration(out _, out _, out _, out var configuration);
-
-                _icon = new Image
-                {
-                    Margin = new Margin(6, 6, 6, 6),
-                    Brush = new TextureBrush(windowIcon),
-                    Color = Style.Current.Foreground,
-                    KeepAspectRatio = false,
-                    TooltipText = string.Format("{0}\nVersion {1}\nConfiguration {3}\nGraphics {2}", _window.Title, Globals.EngineVersion, GPUDevice.Instance.RendererType, configuration),
-                    Parent = this,
-                };
-
-                _title = new Label(0, 0, Width, Height)
-                {
-                    Text = _window.Title,
-                    HorizontalAlignment = TextAlignment.Center,
-                    VerticalAlignment = TextAlignment.Center,
-                    ClipText = true,
-                    TextColor = Style.Current.ForegroundGrey,
-                    TextColorHighlighted = Style.Current.ForegroundGrey,
-                    Parent = this,
-                };
-
-                _closeButton = new Button
-                {
-                    Text = ((char)EditorAssets.SegMDL2Icons.ChromeClose).ToString(),
-                    Font = new FontReference(iconFont),
-                    BackgroundColor = Color.Transparent,
-                    BorderColor = Color.Transparent,
-                    BorderColorHighlighted = Color.Transparent,
-                    BorderColorSelected = Color.Transparent,
-                    TextColor = Style.Current.Foreground,
-                    Width = 46,
-                    BackgroundColorHighlighted = Color.Red,
-                    BackgroundColorSelected = Color.Red.RGBMultiplied(1.3f),
-                    Parent = this,
-                };
-                _closeButton.Clicked += () => _window.Close(ClosingReason.User);
-
-                _minimizeButton = new Button
-                {
-                    Text = ((char)EditorAssets.SegMDL2Icons.ChromeMinimize).ToString(),
-                    Font = new FontReference(iconFont),
-                    BackgroundColor = Color.Transparent,
-                    BorderColor = Color.Transparent,
-                    BorderColorHighlighted = Color.Transparent,
-                    BorderColorSelected = Color.Transparent,
-                    TextColor = Style.Current.Foreground,
-                    Width = 46,
-                    BackgroundColorHighlighted = Style.Current.LightBackground.RGBMultiplied(1.3f),
-                    Parent = this,
-                };
-                _minimizeButton.Clicked += () => _window.Minimize();
-
-                _maximizeButton = new Button
-                {
-                    Text = ((char)(_window.IsMaximized ? EditorAssets.SegMDL2Icons.ChromeRestore : EditorAssets.SegMDL2Icons.ChromeMaximize)).ToString(),
-                    Font = new FontReference(iconFont),
-                    BackgroundColor = Color.Transparent,
-                    BorderColor = Color.Transparent,
-                    BorderColorHighlighted = Color.Transparent,
-                    BorderColorSelected = Color.Transparent,
-                    TextColor = Style.Current.Foreground,
-                    Width = 46,
-                    BackgroundColorHighlighted = Style.Current.LightBackground.RGBMultiplied(1.3f),
-                    Parent = this,
-                };
-                _maximizeButton.Clicked += () =>
-                {
-                    if (_window.IsMaximized)
-                        _window.Restore();
-                    else
-                        _window.Maximize();
-                };
-                _charChromeRestore = ((char)EditorAssets.SegMDL2Icons.ChromeRestore).ToString();
-                _charChromeMaximize = ((char)EditorAssets.SegMDL2Icons.ChromeMaximize).ToString();
-            }
-            else
-#endif
-            {
-                BackgroundColor = Style.Current.LightBackground;
-            }
-        }
-
-#if PLATFORM_WINDOWS
-        /// <inheritdoc />
-        public override void Update(float deltaTime)
-        {
-            base.Update(deltaTime);
-
-            if (_maximizeButton != null)
-            {
-                _maximizeButton.Text = _window.IsMaximized ? _charChromeRestore : _charChromeMaximize;
-            }
-        }
-
-        private void OnWindowClosed()
-        {
-            if (_window != null)
-            {
-                _window.HitTest = null;
-                _window = null;
-            }
-        }
-
-        private WindowHitCodes OnHitTest(ref Float2 mouse)
-        {
-            var dpiScale = _window.DpiScale;
-
-            if (_window.IsMinimized)
-                return WindowHitCodes.NoWhere;
-
-            if (!_window.IsMaximized)
-            {
-                var pos = _window.ScreenToClient(mouse * dpiScale); // pos is not DPI adjusted
-                var winSize = _window.Size;
-
-                // Distance from which the mouse is considered to be on the border/corner
-                float distance = 5.0f * dpiScale;
-
-                if (pos.Y > winSize.Y - distance && pos.X < distance)
-                    return WindowHitCodes.BottomLeft;
-
-                if (pos.X > winSize.X - distance && pos.Y > winSize.Y - distance)
-                    return WindowHitCodes.BottomRight;
-
-                if (pos.Y < distance && pos.X < distance)
-                    return WindowHitCodes.TopLeft;
-
-                if (pos.Y < distance && pos.X > winSize.X - distance)
-                    return WindowHitCodes.TopRight;
-
-                if (pos.X > winSize.X - distance)
-                    return WindowHitCodes.Right;
-
-                if (pos.X < distance)
-                    return WindowHitCodes.Left;
-
-                if (pos.Y < distance)
-                    return WindowHitCodes.Top;
-
-                if (pos.Y > winSize.Y - distance)
-                    return WindowHitCodes.Bottom;
-            }
-
-            var mousePos = PointFromScreen(mouse * dpiScale);
-            var controlUnderMouse = GetChildAt(mousePos);
-            var isMouseOverSth = controlUnderMouse != null && controlUnderMouse != _title;
-            var rb = GetRightButton();
-            if (rb != null && _minimizeButton != null && new Rectangle(rb.UpperRight, _minimizeButton.BottomLeft - rb.UpperRight).Contains(ref mousePos) && !isMouseOverSth)
-                return WindowHitCodes.Caption;
-
-            return WindowHitCodes.Client;
-        }
-#endif
-
-        /// <summary>
-        /// Return the rightmost button.
-        /// </summary>
-        /// <returns>Rightmost button, null if there is no <see cref="MainMenuButton"/></returns>
-        private MainMenuButton GetRightButton()
-        {
-            MainMenuButton b = null;
-            foreach (var control in Children)
-            {
-                if (b == null && control is MainMenuButton)
-                    b = (MainMenuButton)control;
-
-                if (control is MainMenuButton && control.Right > b.Right)
-                    b = (MainMenuButton)control;
-            }
-            return b;
         }
 
         /// <summary>
@@ -298,26 +100,6 @@ namespace FlaxEditor.GUI
             return result;
         }
 
-        /// <inheritdoc />
-        public override bool OnMouseDoubleClick(Float2 location, MouseButton button)
-        {
-            if (base.OnMouseDoubleClick(location, button))
-                return true;
-
-#if PLATFORM_WINDOWS
-            var child = GetChildAtRecursive(location);
-            if (_useCustomWindowSystem && child is not Button && child is not MainMenuButton)
-            {
-                if (_window.IsMaximized)
-                    _window.Restore();
-                else
-                    _window.Maximize();
-            }
-#endif
-
-            return true;
-        }
-
         /// <inheritdoc />
         public override bool OnKeyDown(KeyboardKeys key)
         {
@@ -333,16 +115,8 @@ namespace FlaxEditor.GUI
         protected override void PerformLayoutAfterChildren()
         {
             float x = 0;
-
+            WindowDecorations decorations = Parent.GetChild<WindowDecorations>();
-#if PLATFORM_WINDOWS
+            x += decorations?.Icon?.Width ?? 0;
-            if (_useCustomWindowSystem)
-            {
-                // Icon
-                _icon.X = x;
-                _icon.Size = new Float2(Height);
-                x += _icon.Width;
-            }
-#endif
 
             // Arrange controls
             MainMenuButton rightMostButton = null;
@@ -362,36 +136,20 @@ namespace FlaxEditor.GUI
                 }
             }
             
-#if PLATFORM_WINDOWS
+            // Fill the right side if title and buttons are not present
-            if (_useCustomWindowSystem)
+            if (decorations?.Title == null)
-            {
+                Width = Parent.Width;
-                // Buttons
+            else
-                _closeButton.Height = Height;
+                Width = x;
-                _closeButton.X = Width - _closeButton.Width;
-                _maximizeButton.Height = Height;
-                _maximizeButton.X = _closeButton.X - _maximizeButton.Width;
-                _minimizeButton.Height = Height;
-                _minimizeButton.X = _maximizeButton.X - _minimizeButton.Width;
-
-                // Title
-                _title.Bounds = new Rectangle(x + 2, 0, _minimizeButton.Left - x - 4, Height);
-                //_title.Text = _title.Width < 300.0f ? Editor.Instance.ProjectInfo.Name : _window.Title;
-            }
-#endif
         }
 
-#if PLATFORM_WINDOWS
         /// <inheritdoc />
         public override void OnDestroy()
         {
             base.OnDestroy();
             
-            if (_window != null)
+            if (_selected != null)
-            {
+                Selected = null;
-                _window.Closed -= OnWindowClosed;
-                OnWindowClosed();
-            }
         }
-#endif
     }
 }

Source/Editor/GUI/MainMenuButton.cs

@@ -42,14 +42,12 @@ namespace FlaxEditor.GUI
             Text = text;
 
             var style = Style.Current;
-#if PLATFORM_WINDOWS
+            if (!Utilities.Utils.UseCustomWindowDecorations())
-            if (Editor.Instance.Options.Options.Interface.UseNativeWindowSystem)
             {
                 BackgroundColorMouseOver = style.BackgroundHighlighted;
                 BackgroundColorMouseOverOpened = style.Background;
             }
             else
-#endif
             {
                 BackgroundColorMouseOver = BackgroundColorMouseOverOpened = style.LightBackground * 1.3f;
             }

Source/Editor/GUI/Tree/TreeNode.cs

@@ -1140,8 +1140,11 @@ namespace FlaxEditor.GUI.Tree
                         ParentTree.DraggedOverNode = this;
 
                     // Expand node if mouse goes over arrow
-                    if (ArrowRect.Contains(location) && HasAnyVisibleChild)
+                    if (ArrowRect.Contains(location) && HasAnyVisibleChild && IsCollapsed)
+                    {
                         Expand(true);
+                        ParentTree?.FlushPendingPerformLayout();
+                    }
 
                     result = OnDragEnterHeader(data);
                 }
@@ -1172,8 +1175,11 @@ namespace FlaxEditor.GUI.Tree
                         ParentTree.DraggedOverNode = this;
 
                     // Expand node if mouse goes over arrow
-                    if (ArrowRect.Contains(location) && HasAnyVisibleChild)
+                    if (ArrowRect.Contains(location) && HasAnyVisibleChild && IsCollapsed)
+                    {
                         Expand(true);
+                        ParentTree?.FlushPendingPerformLayout();
+                    }
 
                     if (!_isDragOverHeader)
                         result = OnDragEnterHeader(data);

Source/Editor/GUI/WindowDecorations.cs

@@ -0,0 +1,339 @@
+// Copyright (c) Wojciech Figat. All rights reserved.
+
+using FlaxEngine;
+using FlaxEngine.GUI;
+
+namespace FlaxEditor.GUI;
+
+/// <summary>
+/// Represents the title bar of the window with buttons.
+/// </summary>
+/// <seealso cref="FlaxEngine.GUI.ContainerControl" />
+public class WindowDecorations : ContainerControl
+{
+    private Image _icon;
+    private Label _title;
+    private Button _closeButton;
+    private Button _minimizeButton;
+    private Button _maximizeButton;
+    private LocalizedString _charChromeRestore, _charChromeMaximize;
+    private Window _window;
+
+    /// <summary>
+    /// The title label in the title bar.
+    /// </summary>
+    public Label Title => _title;
+
+    /// <summary>
+    /// The icon used in the title bar.
+    /// </summary>
+    public Image Icon => _icon;
+
+    /// <summary>
+    /// The tooltip shown when hovering over the icon.
+    /// </summary>
+    public string IconTooltipText
+    {
+        get => _icon?.TooltipText ?? null;
+        set
+        {
+            if (_icon != null)
+                _icon.TooltipText = value;
+        }
+    }
+
+    /// <summary>
+    /// Initializes a new instance of the <see cref="WindowDecorations"/> class.
+    /// </summary>
+    /// <param name="window">The window.</param>
+    /// <param name="iconOnly">When set, omit drawing title and buttons.</param>
+    public WindowDecorations(RootControl window, bool iconOnly = false)
+    : base(0, 0, 0, 20)
+    {
+        _window = window.RootWindow.Window;
+
+        AutoFocus = false;
+        AnchorPreset = AnchorPresets.HorizontalStretchTop;
+        BackgroundColor = Color.Transparent;
+
+        var windowIcon = FlaxEngine.Content.LoadAsyncInternal<Texture>(EditorAssets.WindowIcon);
+
+        _icon = new Image
+        {
+            Margin = new Margin(4, 4, 4, 4),
+            Brush = new TextureBrush(windowIcon),
+            Color = Style.Current.Foreground,
+            BackgroundColor = Style.Current.LightBackground,
+            KeepAspectRatio = false,
+            Parent = this,
+        };
+
+        if (!iconOnly)
+        {
+            _icon.Margin = new Margin(6, 6, 6, 6);
+            Height = 28;
+
+            _window.HitTest += OnHitTest;
+            _window.Closed += OnWindowClosed;
+
+            FontAsset windowIconsFont = FlaxEngine.Content.LoadAsyncInternal<FontAsset>(EditorAssets.WindowIconsFont);
+            Font iconFont = windowIconsFont?.CreateFont(9);
+
+            _title = new Label(0, 0, Width, Height)
+            {
+                Text = _window.Title,
+                HorizontalAlignment = TextAlignment.Center,
+                VerticalAlignment = TextAlignment.Center,
+                ClipText = true,
+                TextColor = Style.Current.ForegroundGrey,
+                TextColorHighlighted = Style.Current.ForegroundGrey,
+                BackgroundColor = Style.Current.LightBackground,
+                Parent = this,
+            };
+
+            _closeButton = new Button
+            {
+                Text = ((char)EditorAssets.SegMDL2Icons.ChromeClose).ToString(),
+                Font = new FontReference(iconFont),
+                BackgroundColor = Style.Current.LightBackground,
+                BorderColor = Color.Transparent,
+                BorderColorHighlighted = Color.Transparent,
+                BorderColorSelected = Color.Transparent,
+                TextColor = Style.Current.Foreground,
+                Width = 46,
+                BackgroundColorHighlighted = Color.Red,
+                BackgroundColorSelected = Color.Red.RGBMultiplied(1.3f),
+                Parent = this,
+            };
+            _closeButton.Clicked += () => _window.Close(ClosingReason.User);
+
+            _minimizeButton = new Button
+            {
+                Text = ((char)EditorAssets.SegMDL2Icons.ChromeMinimize).ToString(),
+                Font = new FontReference(iconFont),
+                BackgroundColor = Style.Current.LightBackground,
+                BorderColor = Color.Transparent,
+                BorderColorHighlighted = Color.Transparent,
+                BorderColorSelected = Color.Transparent,
+                TextColor = Style.Current.Foreground,
+                Width = 46,
+                BackgroundColorHighlighted = Style.Current.LightBackground.RGBMultiplied(1.3f),
+                Parent = this,
+            };
+            _minimizeButton.Clicked += () => _window.Minimize();
+
+            _maximizeButton = new Button
+            {
+                Text = ((char)(_window.IsMaximized ? EditorAssets.SegMDL2Icons.ChromeRestore : EditorAssets.SegMDL2Icons.ChromeMaximize)).ToString(),
+                Font = new FontReference(iconFont),
+                BackgroundColor = Style.Current.LightBackground,
+                BorderColor = Color.Transparent,
+                BorderColorHighlighted = Color.Transparent,
+                BorderColorSelected = Color.Transparent,
+                TextColor = Style.Current.Foreground,
+                Width = 46,
+                BackgroundColorHighlighted = Style.Current.LightBackground.RGBMultiplied(1.3f),
+                Parent = this,
+            };
+            _maximizeButton.Clicked += () =>
+            {
+                if (_window.IsMaximized)
+                    _window.Restore();
+                else
+                    _window.Maximize();
+            };
+
+            _charChromeRestore = ((char)EditorAssets.SegMDL2Icons.ChromeRestore).ToString();
+            _charChromeMaximize = ((char)EditorAssets.SegMDL2Icons.ChromeMaximize).ToString();
+        }
+    }
+
+    /// <inheritdoc />
+    public override void Update(float deltaTime)
+    {
+        base.Update(deltaTime);
+
+        if (_maximizeButton != null)
+        {
+            var maximizeText = _window.IsMaximized ? _charChromeRestore : _charChromeMaximize;
+            if (_maximizeButton.Text != maximizeText)
+                _maximizeButton.Text = maximizeText;
+        }
+    }
+
+    private void OnWindowClosed()
+    {
+        if (_window != null)
+        {
+            _window.HitTest -= OnHitTest;
+            _window = null;
+        }
+    }
+
+    /// <summary>
+    /// Perform hit test on the window.
+    /// </summary>
+    /// <param name="mouse">The mouse position</param>
+    /// <returns>The hit code for given position.</returns>
+    protected virtual WindowHitCodes OnHitTest(ref Float2 mouse)
+    {
+        if (_window.IsMinimized)
+            return WindowHitCodes.NoWhere;
+
+        var dpiScale = _window.DpiScale;
+        var pos = _window.ScreenToClient(mouse * dpiScale); // pos is not DPI adjusted
+        if (!_window.IsMaximized)
+        {
+            var winSize = _window.Size;
+
+            // Distance from which the mouse is considered to be on the border/corner
+            float distance = 5.0f * dpiScale;
+
+            if (pos.Y > winSize.Y - distance && pos.X < distance)
+                return WindowHitCodes.BottomLeft;
+
+            if (pos.X > winSize.X - distance && pos.Y > winSize.Y - distance)
+                return WindowHitCodes.BottomRight;
+
+            if (pos.Y < distance && pos.X < distance)
+                return WindowHitCodes.TopLeft;
+
+            if (pos.Y < distance && pos.X > winSize.X - distance)
+                return WindowHitCodes.TopRight;
+
+            if (pos.X > winSize.X - distance)
+                return WindowHitCodes.Right;
+
+            if (pos.X < distance)
+                return WindowHitCodes.Left;
+
+            if (pos.Y < distance)
+                return WindowHitCodes.Top;
+
+            if (pos.Y > winSize.Y - distance)
+                return WindowHitCodes.Bottom;
+        }
+
+        var controlUnderMouse = GetChildAt(pos, control => control != _title);
+        if (_title.Bounds.Contains(pos) && controlUnderMouse == null)
+            return WindowHitCodes.Caption;
+
+        return WindowHitCodes.Client;
+    }
+
+    /// <inheritdoc />
+    public override bool OnMouseDoubleClick(Float2 location, MouseButton button)
+    {
+        // These may not work with main window due to SDL not passing mouse events
+        // when interacting with hit tests on caption area...
+
+        if (Title.Bounds.Contains(location) && button == MouseButton.Left)
+        {
+            if (_window.IsMaximized)
+                _window.Restore();
+            else
+                _window.Maximize();
+            return true;
+        }
+        else if (Icon.Bounds.Contains(location) && button == MouseButton.Left)
+        {
+            _window.Close(ClosingReason.User);
+            return true;
+        }
+        return base.OnMouseDoubleClick(location, button);
+    }
+
+    /// <inheritdoc />
+    protected override void PerformLayoutAfterChildren()
+    {
+        // Calculate extents for title bounds area excluding the icon and main menu area
+        float x = 0;
+
+        // Icon
+        if (_icon != null)
+        {
+            _icon.X = x;
+            _icon.Size = new Float2(Height);
+            x += _icon.Width;
+        }
+
+        // Main menu if present
+        if (Parent.GetChild<MainMenu>() is MainMenu mainMenu)
+        {
+            for (int i = 0; i < mainMenu.Children.Count; i++)
+            {
+                var c = mainMenu.Children[i];
+                if (c is MainMenuButton b && c.Visible)
+                {
+                    b.Bounds = new Rectangle(x, 0, b.Width, Height);
+                    x += b.Width;
+                }
+            }
+        }
+
+        // Buttons
+        float rightMostButtonX = Width;
+        if (_closeButton != null)
+        {
+            _closeButton.Height = Height;
+            _closeButton.X = rightMostButtonX - _closeButton.Width;
+            rightMostButtonX = _closeButton.X;
+        }
+        if (_maximizeButton != null)
+        {
+            _maximizeButton.Height = Height;
+            _maximizeButton.X = rightMostButtonX - _maximizeButton.Width;
+            rightMostButtonX = _maximizeButton.X;
+        }
+        if (_minimizeButton != null)
+        {
+            _minimizeButton.Height = Height;
+            _minimizeButton.X = rightMostButtonX - _minimizeButton.Width;
+            rightMostButtonX = _minimizeButton.X;
+        }
+
+        // Title
+        if (_title != null)
+        {
+            _title.Text = _window.Title;
+            _title.Bounds = new Rectangle(x, 0, rightMostButtonX - x, Height);
+        }
+    }
+
+    /// <inheritdoc />
+    public override void Draw()
+    {
+        base.Draw();
+        DrawBorders();
+    }
+
+    /// <summary>
+    /// Draw borders around the window.
+    /// </summary>
+    public virtual void DrawBorders()
+    {
+        var win = RootWindow.Window;
+        if (win.IsMaximized)
+            return;
+
+        if (Editor.Instance.UI.StatusBar == null)
+            return;
+
+        const float thickness = 1.0f;
+        Color color = Editor.Instance.UI.StatusBar.StatusColor;
+        Rectangle rect = new Rectangle(thickness * 0.5f, thickness * 0.5f, Parent.Width - thickness, Parent.Height - thickness);
+        Render2D.DrawRectangle(rect, color);
+    }
+
+    /// <inheritdoc />
+    public override void OnDestroy()
+    {
+        base.OnDestroy();
+
+        if (_window != null)
+        {
+            _window.Closed -= OnWindowClosed;
+            OnWindowClosed();
+        }
+    }
+}

Source/Editor/Gizmo/GizmoBase.cs

@@ -13,6 +13,7 @@ namespace FlaxEditor.Gizmo
     public abstract class GizmoBase
     {
         private IGizmoOwner _owner;
+        private bool _visible = true;
 
         /// <summary>
         /// Gets the gizmo owner.
@@ -34,6 +35,11 @@ namespace FlaxEditor.Gizmo
         /// </summary>
         public virtual BoundingSphere FocusBounds => BoundingSphere.Empty;
 
+        /// <summary>
+        /// Gets or sets a value indicating whether this gizmo is visible.
+        /// </summary>
+        public bool Visible { get { return _visible; } set { _visible = value; } }
+
         /// <summary>
         /// Initializes a new instance of the <see cref="GizmoBase"/> class.
         /// </summary>

Source/Editor/Gizmo/ViewportRubberBandSelector.cs

@@ -36,11 +36,12 @@ public sealed class ViewportRubberBandSelector
     /// Triggers the start of a rubber band selection.
     /// </summary>
     /// <returns>True if selection started, otherwise false.</returns>
-    public bool TryStartingRubberBandSelection()
+    public bool TryStartingRubberBandSelection(Float2 mousePosition)
     {
         if (!_isRubberBandSpanning && _owner.Gizmos.Active != null && !_owner.Gizmos.Active.IsControllingMouse && !_owner.IsRightMouseButtonDown)
         {
             _tryStartRubberBand = true;
+            _cachedStartingMousePosition = mousePosition;
             return true;
         }
         return false;
@@ -82,12 +83,15 @@ public sealed class ViewportRubberBandSelector
             return;
         }
 
-        if (_tryStartRubberBand && (Mathf.Abs(_owner.MouseDelta.X) > 0.1f || Mathf.Abs(_owner.MouseDelta.Y) > 0.1f) && canStart)
+        if (_tryStartRubberBand && canStart)
         {
-            _isRubberBandSpanning = true;
+            var delta = mousePosition - _cachedStartingMousePosition;
-            _cachedStartingMousePosition = mousePosition;
+            if (Mathf.Abs(delta.X) > 0.1f || Mathf.Abs(delta.Y) > 0.1f)
-            _rubberBandRect = new Rectangle(_cachedStartingMousePosition, Float2.Zero);
+            {
-            _tryStartRubberBand = false;
+                _isRubberBandSpanning = true;
+                _rubberBandRect = new Rectangle(_cachedStartingMousePosition, Float2.Zero);
+                _tryStartRubberBand = false;
+            }
         }
         else if (_isRubberBandSpanning && _owner.Gizmos.Active != null && !_owner.Gizmos.Active.IsControllingMouse && !_owner.IsRightMouseButtonDown)
         {

Source/Editor/Managed/ManagedEditor.Internal.cpp

@@ -402,10 +402,11 @@ DEFINE_INTERNAL_CALL(void) EditorInternal_RunVisualScriptBreakpointLoopTick(floa
                 break;
             }
         }
+        WindowsManager::WindowsLocker.Unlock();
         for (const auto& e : inputEvents)
         {
             auto window = e.Target ? e.Target : defaultWindow;
-            if (!window)
+            if (!window || window->IsClosed())
                 continue;
             switch (e.Type)
             {
@@ -435,12 +436,14 @@ DEFINE_INTERNAL_CALL(void) EditorInternal_RunVisualScriptBreakpointLoopTick(floa
             case InputDevice::EventType::MouseMove:
                 window->OnMouseMove(window->ScreenToClient(e.MouseData.Position));
                 break;
+            case InputDevice::EventType::MouseMoveRelative:
+                window->OnMouseMoveRelative(e.MouseMovementData.PositionRelative);
+                break;
             case InputDevice::EventType::MouseLeave:
                 window->OnMouseLeave();
                 break;
             }
         }
-        WindowsManager::WindowsLocker.Unlock();
     }
     WindowsManager::WindowsLocker.Lock();
     Array<Window*, InlinedAllocation<32>> windows;

Source/Editor/Modules/ContentDatabaseModule.cs

@@ -1013,7 +1013,7 @@ namespace FlaxEditor.Modules
                     ContentItem item;
                     if (path.EndsWith(".cs"))
                         item = new CSharpScriptItem(path);
-                    else if (path.EndsWith(".cpp") || path.EndsWith(".h"))
+                    else if (path.EndsWith(".cpp") || path.EndsWith(".h") || path.EndsWith(".c") || path.EndsWith(".hpp"))
                         item = new CppScriptItem(path);
                     else if (path.EndsWith(".shader") || path.EndsWith(".hlsl"))
                         item = new ShaderSourceItem(path);

Source/Editor/Modules/ContentImportingModule.cs

@@ -222,7 +222,7 @@ namespace FlaxEditor.Modules
                 outputExtension = extension;
 
                 // Check if can place source files here
-                if (!targetLocation.CanHaveScripts && (extension == ".cs" || extension == ".cpp" || extension == ".h"))
+                if (!targetLocation.CanHaveScripts && (extension == ".cs" || extension == ".cpp" || extension == ".h" || extension == ".c" || extension == ".hpp"))
                 {
                     // Error
                     Editor.LogWarning(string.Format("Cannot import \'{0}\' to \'{1}\'. The target directory cannot have scripts.", inputPath, targetLocation.Node.Path));

Source/Editor/Modules/SceneEditingModule.cs

@@ -16,6 +16,8 @@ namespace FlaxEditor.Modules
     /// <seealso cref="FlaxEditor.Modules.EditorModule" />
     public sealed class SceneEditingModule : EditorModule
     {
+        private int _lastSelectionStatus = 0;
+
         /// <summary>
         /// The selected objects.
         /// </summary>
@@ -193,6 +195,20 @@ namespace FlaxEditor.Modules
             Undo.AddAction(new SelectionChangeAction(before, Selection.ToArray(), OnSelectionUndo));
 
             OnSelectionChanged();
+
+            // Display amount of selected actors on the status bar
+            Editor.UI.RemoveStatusMessage(_lastSelectionStatus);
+            var objects = Selection.Count;
+            var actors = CountActors(Selection);
+            _lastSelectionStatus = Editor.UI.AddStatusMessage($"Selected {objects} {(objects > 1 ? "objects" : "object")} (total {actors} {(actors > 1 ? "actors" : "actor")})");
+        }
+
+        private int CountActors(List<SceneGraphNode> nodes)
+        {
+            int result = 0;
+            foreach (var node in nodes)
+                result += 1 + CountActors(node.ChildNodes);
+            return result;
         }
 
         private void OnSelectionUndo(SceneGraphNode[] toSelect)
@@ -229,7 +245,7 @@ namespace FlaxEditor.Modules
             if (!isPlayMode && options.General.AutoRebuildNavMesh && actor.Scene && node.AffectsNavigationWithChildren)
             {
                 var bounds = actor.BoxWithChildren;
-                Navigation.BuildNavMesh(actor.Scene, bounds, options.General.AutoRebuildNavMeshTimeoutMs);
+                Navigation.BuildNavMesh(bounds, options.General.AutoRebuildNavMeshTimeoutMs);
             }
         }
 

Source/Editor/Modules/SimulationModule.cs

@@ -267,7 +267,7 @@ namespace FlaxEditor.Modules
         }
 
         /// <inheritdoc />
-        public override void OnPlayBegin()
+        public override void OnPlayBeginning()
         {
             Editor.Windows.FlashMainWindow();
 

Source/Editor/Modules/UIModule.cs

@@ -16,7 +16,6 @@ using FlaxEditor.Windows;
 using FlaxEngine;
 using FlaxEngine.GUI;
 using FlaxEngine.Json;
-using DockHintWindow = FlaxEditor.GUI.Docking.DockHintWindow;
 using MasterDockPanel = FlaxEditor.GUI.Docking.MasterDockPanel;
 using FlaxEditor.Content.Settings;
 using FlaxEditor.Options;
@@ -29,10 +28,52 @@ namespace FlaxEditor.Modules
     /// <seealso cref="FlaxEditor.Modules.EditorModule" />
     public sealed class UIModule : EditorModule
     {
+        private class MainWindowDecorations : WindowDecorations
+        {
+            public MainWindowDecorations(RootControl window, bool iconOnly)
+            : base(window, iconOnly)
+            {
+            }
+
+            /// <inheritdoc />
+            public override bool OnKeyDown(KeyboardKeys key)
+            {
+                if (base.OnKeyDown(key))
+                    return true;
+
+                // Fallback to the edit window for shortcuts
+                var editor = Editor.Instance;
+                return editor.Windows.EditWin.InputActions.Process(editor, this, key);
+            }
+
+            /// <inheritdoc />
+            public override void DrawBorders()
+            {
+                // Draw main window borders if using a custom style
+                var win = RootWindow.Window;
+                if (win.IsMaximized)
+                    return;
+
+                var color = Editor.Instance.UI.StatusBar.StatusColor;
+                var rect = new Rectangle(0.5f, 0.5f, Parent.Width - 1.0f, Parent.Height - 1.0f - StatusBar.DefaultHeight);
+                Render2D.DrawLine(rect.UpperLeft, rect.UpperRight, color);
+                Render2D.DrawLine(rect.UpperLeft, rect.BottomLeft, color);
+                Render2D.DrawLine(rect.UpperRight, rect.BottomRight, color);
+            }
+        }
+
+        private struct Status
+        {
+            public int ID;
+            public string Text;
+            public DateTime EndTime;
+        }
+
         private Label _progressLabel;
         private ProgressBar _progressBar;
         private Button _outputLogButton;
-        private List<KeyValuePair<string, DateTime>> _statusMessages;
+        private List<Status> _statusMessages;
+        private int _statusID = 1;
         private ContentStats _contentStats;
         private bool _progressFailed;
 
@@ -125,6 +166,7 @@ namespace FlaxEditor.Modules
         private ContextMenuButton _menuToolsProfilerWindow;
         private ContextMenuButton _menuToolsSetTheCurrentSceneViewAsDefault;
         private ContextMenuButton _menuToolsTakeScreenshot;
+        private ContextMenuButton _menuToolsOpenLocalFolder;
         private ContextMenuChildMenu _menuWindowApplyWindowLayout;
 
         private ToolStripButton _toolStripSaveAll;
@@ -144,6 +186,11 @@ namespace FlaxEditor.Modules
         /// </summary>
         public MainMenu MainMenu;
 
+        /// <summary>
+        /// The window decorations (title bar with buttons)
+        /// </summary>
+        public WindowDecorations WindowDecorations;
+
         /// <summary>
         /// The tool strip control.
         /// </summary>
@@ -340,7 +387,7 @@ namespace FlaxEditor.Modules
 
             string text;
             if (_statusMessages != null && _statusMessages.Count != 0)
-                text = _statusMessages[0].Key;
+                text = _statusMessages[0].Text;
             else if (Editor.StateMachine.CurrentState.Status != null)
                 text = Editor.StateMachine.CurrentState.Status;
             else if (contentStats.LoadingAssetsCount != 0)
@@ -362,13 +409,34 @@ namespace FlaxEditor.Modules
         /// Adds the status bar message text to be displayed as a notification.
         /// </summary>
         /// <param name="message">The message to display.</param>
-        public void AddStatusMessage(string message)
+        /// <returns>The ID of that status message (unique). Can be used to hide it manually.</returns>
+        public int AddStatusMessage(string message)
         {
             if (_statusMessages == null)
-                _statusMessages = new List<KeyValuePair<string, DateTime>>();
+                _statusMessages = new List<Status>();
-            _statusMessages.Add(new KeyValuePair<string, DateTime>(message, DateTime.Now + TimeSpan.FromSeconds(3.0f)));
+            var status = new Status { ID = _statusID++, Text = message, EndTime = DateTime.Now + TimeSpan.FromSeconds(3.0f) };
+            _statusMessages.Add(status);
             if (_statusMessages.Count == 1)
                 UpdateStatusBar();
+            return status.ID;
+        }
+
+        /// <summary>
+        /// Removes a specific status message once it's not needed anymore,
+        /// </summary>
+        /// <param name="id">The ID of the message returned by <see cref="AddStatusMessage"/>.</param>
+        public void RemoveStatusMessage(int id)
+        {
+            if (_statusMessages == null || id == 0)
+                return;
+            for (var i = 0; i < _statusMessages.Count; i++)
+            {
+                if (_statusMessages[i].ID == id)
+                {
+                    _statusMessages.RemoveAt(i);
+                    return;
+                }
+            }
         }
 
         internal bool ProgressVisible
@@ -426,19 +494,11 @@ namespace FlaxEditor.Modules
             InitToolstrip(mainWindow);
             InitStatusBar(mainWindow);
             InitDockPanel(mainWindow);
+            InitWindowDecorations(mainWindow);
 
             Editor.Options.OptionsChanged += OnOptionsChanged;
 
-            // Add dummy control for drawing the main window borders if using a custom style
+            mainWindow.PerformLayout(true);
-#if PLATFORM_WINDOWS
-            if (!Editor.Options.Options.Interface.UseNativeWindowSystem)
-#endif
-            {
-                mainWindow.AddChild(new CustomWindowBorderControl
-                {
-                    Size = Float2.Zero,
-                });
-            }
         }
 
         private void InitViewportScaleOptions()
@@ -489,13 +549,13 @@ namespace FlaxEditor.Modules
         public void SaveCustomViewportScalingOptions()
         {
             var customOptions = JsonSerializer.Serialize(CustomViewportScaleOptions);
-            Editor.Instance.ProjectCache.SetCustomData("CustomViewportScalingOptions",  customOptions);
+            Editor.Instance.ProjectCache.SetCustomData("CustomViewportScalingOptions", customOptions);
         }
 
         /// <inheritdoc />
         public override void OnUpdate()
         {
-            if (_statusMessages != null && _statusMessages.Count > 0 && _statusMessages[0].Value - DateTime.Now < TimeSpan.Zero)
+            if (_statusMessages != null && _statusMessages.Count > 0 && _statusMessages[0].EndTime - DateTime.Now < TimeSpan.Zero)
             {
                 _statusMessages.RemoveAt(0);
                 UpdateStatusBar();
@@ -510,23 +570,6 @@ namespace FlaxEditor.Modules
             }
         }
 
-        private class CustomWindowBorderControl : Control
-        {
-            /// <inheritdoc />
-            public override void Draw()
-            {
-                var win = RootWindow.Window;
-                if (win.IsMaximized)
-                    return;
-
-                var color = Editor.Instance.UI.StatusBar.StatusColor;
-                var rect = new Rectangle(0.5f, 0.5f, Parent.Width - 1.0f, Parent.Height - 1.0f - StatusBar.DefaultHeight);
-                Render2D.DrawLine(rect.UpperLeft, rect.UpperRight, color);
-                Render2D.DrawLine(rect.UpperLeft, rect.BottomLeft, color);
-                Render2D.DrawLine(rect.UpperRight, rect.BottomRight, color);
-            }
-        }
-
         /// <inheritdoc />
         public override void OnEndInit()
         {
@@ -558,13 +601,6 @@ namespace FlaxEditor.Modules
             UpdateToolstrip();
         }
 
-        /// <inheritdoc />
-        public override void OnExit()
-        {
-            // Cleanup dock panel hint proxy windows (Flax will destroy them by var but it's better to clear them earlier)
-            DockHintWindow.Proxy.Dispose();
-        }
-
         private IColorPickerDialog ShowPickColorDialog(Control targetControl, Color initialValue, ColorValueBox.ColorPickerEvent colorChanged, ColorValueBox.ColorPickerClosedEvent pickerClosed, bool useDynamicEditing)
         {
             var dialog = new ColorPickerDialog(initialValue, colorChanged, pickerClosed, useDynamicEditing);
@@ -618,10 +654,12 @@ namespace FlaxEditor.Modules
 
         private void InitMainMenu(RootControl mainWindow)
         {
-            MainMenu = new MainMenu(mainWindow)
+            MainMenu = new MainMenu()
             {
                 Parent = mainWindow
             };
+            if (Utilities.Utils.UseCustomWindowDecorations(isMainWindow: true))
+                MainMenu.Height = 28;
 
             var inputOptions = Editor.Options.Options.Input;
 
@@ -725,12 +763,22 @@ namespace FlaxEditor.Modules
             _menuToolsTakeScreenshot = cm.AddButton("Take screenshot", inputOptions.TakeScreenshot, Editor.Windows.TakeScreenshot);
             cm.AddSeparator();
             cm.AddButton("Plugins", () => Editor.Windows.PluginsWin.Show());
+            cm.AddSeparator();
+            var childMenu = cm.AddChildMenu("Open Product Local folder");
+            childMenu.ContextMenu.AddButton("Editor", () => FileSystem.ShowFileExplorer(Globals.ProductLocalFolder));
+            _menuToolsOpenLocalFolder = childMenu.ContextMenu.AddButton("Game", () =>
+            {
+                string localAppData = Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData);
+                GameSettings settings = GameSettings.Load<GameSettings>();
+                string path = Path.Combine(localAppData, settings.CompanyName, settings.ProductName);
+                FileSystem.ShowFileExplorer(path);
+            });
 
             // Window
             MenuWindow = MainMenu.AddButton("Window");
             cm = MenuWindow.ContextMenu;
             cm.VisibleChanged += OnMenuWindowVisibleChanged;
-            cm.AddButton("Content", inputOptions.ContentWindow,Editor.Windows.ContentWin.FocusOrShow);
+            cm.AddButton("Content", inputOptions.ContentWindow, Editor.Windows.ContentWin.FocusOrShow);
             cm.AddButton("Scene", inputOptions.SceneWindow, Editor.Windows.SceneWin.FocusOrShow);
             cm.AddButton("Toolbox", inputOptions.ToolboxWindow, Editor.Windows.ToolboxWin.FocusOrShow);
             cm.AddButton("Properties", inputOptions.PropertiesWindow, Editor.Windows.PropertiesWin.FocusOrShow);
@@ -763,6 +811,23 @@ namespace FlaxEditor.Modules
             cm.AddButton("Information about Flax", () => new AboutDialog().Show());
         }
 
+        private void InitWindowDecorations(RootControl mainWindow)
+        {
+            ScriptsBuilder.GetBinariesConfiguration(out _, out _, out _, out var configuration);
+            string driver = string.Empty;
+#if PLATFORM_LINUX
+            driver = LinuxPlatform.DisplayServer;
+            if (!string.IsNullOrEmpty(driver))
+                driver = $" ({driver})";
+#endif
+
+            WindowDecorations = new MainWindowDecorations(mainWindow, !Utilities.Utils.UseCustomWindowDecorations(isMainWindow: true))
+            {
+                Parent = mainWindow,
+                IconTooltipText = $"{mainWindow.RootWindow.Title}\nVersion {Globals.EngineVersion}\nConfiguration {configuration}\nGraphics {GPUDevice.Instance.RendererType}{driver}",
+            };
+        }
+
         private void OnOptionsChanged(EditorOptions options)
         {
             var inputOptions = options.Input;
@@ -1062,6 +1127,10 @@ namespace FlaxEditor.Modules
             _menuToolsBuildNavMesh.Enabled = canEdit;
             _menuToolsCancelBuilding.Enabled = GameCooker.IsRunning;
             _menuToolsSetTheCurrentSceneViewAsDefault.Enabled = Level.ScenesCount > 0;
+            string localAppData = Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData);
+            GameSettings settings = GameSettings.Load<GameSettings>();
+            string path = Path.Combine(localAppData, settings.CompanyName, settings.ProductName);
+            _menuToolsOpenLocalFolder.Enabled = Directory.Exists(path);
 
             c.PerformLayout();
         }
@@ -1183,6 +1252,7 @@ namespace FlaxEditor.Modules
         {
             // Clear UI references (GUI cannot be used after window closing)
             MainMenu = null;
+            WindowDecorations = null;
             ToolStrip = null;
             MasterPanel = null;
             StatusBar = null;

Source/Editor/Modules/WindowsModule.cs

@@ -10,7 +10,6 @@ using System.Text;
 using System.Xml;
 using FlaxEditor.Content;
 using FlaxEditor.GUI.Dialogs;
-using FlaxEditor.GUI.Docking;
 using FlaxEditor.Windows;
 using FlaxEditor.Windows.Assets;
 using FlaxEditor.Windows.Profiler;
@@ -491,10 +490,15 @@ namespace FlaxEditor.Modules
                         Editor.LogWarning("Empty panel inside layout.");
                         p.RemoveIt();
                     }
+                    else
+                    {
+                        p.CollapseEmptyTabsProxy();
+                    }
                 }
             }
 
             panel.SelectTab(selectedTab);
+            panel.CollapseEmptyTabsProxy();
         }
 
         private static void SaveBounds(XmlWriter writer, Window win)
@@ -758,17 +762,19 @@ namespace FlaxEditor.Modules
             var settings = CreateWindowSettings.Default;
             settings.Title = "Flax Editor";
             settings.Size = Platform.DesktopSize * 0.75f;
+            settings.MinimumSize = new Float2(200, 150);
             settings.StartPosition = WindowStartPosition.CenterScreen;
             settings.ShowAfterFirstPaint = true;
-#if PLATFORM_WINDOWS
+            
-            if (!Editor.Instance.Options.Options.Interface.UseNativeWindowSystem)
+            if (Utilities.Utils.UseCustomWindowDecorations(isMainWindow: true))
             {
                 settings.HasBorder = false;
-
+#if PLATFORM_WINDOWS && !PLATFORM_SDL
                 // Skip OS sizing frame and implement it using LeftButtonHit
                 settings.HasSizingFrame = false;
+#endif
             }
-#elif PLATFORM_LINUX
+#if PLATFORM_LINUX && !PLATFORM_SDL
             settings.HasBorder = false;
 #endif
             MainWindow = Platform.CreateWindow(ref settings);

Source/Editor/Options/InputOptions.cs

@@ -387,6 +387,14 @@ namespace FlaxEditor.Options
         [EditorDisplay("Viewport"), EditorOrder(1760)]
         public InputBinding ToggleOrthographic = new InputBinding(KeyboardKeys.NumpadDecimal);
 
+        [DefaultValue(typeof(InputBinding), "G")]
+        [EditorDisplay("Viewport"), EditorOrder(1770)]
+        public InputBinding ToggleGameView = new InputBinding(KeyboardKeys.G);
+
+        [DefaultValue(typeof(InputBinding), "P")]
+        [EditorDisplay("Viewport"), EditorOrder(1770)]
+        public InputBinding ToggleNavMeshVisibility = new InputBinding(KeyboardKeys.P);
+
         #endregion
 
         #region Debug Views
@@ -571,6 +579,10 @@ namespace FlaxEditor.Options
         [EditorDisplay("View Flags"), EditorOrder(3260)]
         public InputBinding DebugDraw = new InputBinding(KeyboardKeys.Alpha4, KeyboardKeys.Control, KeyboardKeys.Shift);
 
+        [DefaultValue(typeof(InputBinding), "None")]
+        [EditorDisplay("View Flags"), EditorOrder(3270)]
+        public InputBinding Particles = new InputBinding(KeyboardKeys.None);
+
         #endregion
 
         #region Interface

Source/Editor/Options/InterfaceOptions.cs

@@ -85,10 +85,12 @@ namespace FlaxEditor.Options
             /// Never show the close button.
             /// </summary>
             Never,
+
             /// <summary>
             /// Show the close button on tabs that are currently selected.
             /// </summary>
             SelectedTab,
+
             /// <summary>
             /// Show the close button on all tabs that can be closed.
             /// </summary>
@@ -179,6 +181,34 @@ namespace FlaxEditor.Options
             GameWindowThenRestore,
         }
 
+        /// <summary>
+        /// Options for type of window decorations to use.
+        /// </summary>
+        public enum WindowDecorationsType
+        {
+            /// <summary>
+            /// Determined automatically based on the system and any known compatibility issues with native decorations.
+            /// </summary>
+            Auto,
+
+            /// <summary>
+            /// Automatically choose most compatible window decorations for child windows, prefer custom decorations on main window.
+            /// </summary>
+            [EditorDisplay(Name = "Auto (Child Only)")]
+            AutoChildOnly,
+
+            /// <summary>
+            /// Use native system window decorations on all windows.
+            /// </summary>
+            Native,
+
+            /// <summary>
+            /// Use custom client-side window decorations on all windows.
+            /// </summary>
+            [EditorDisplay(Name = "Client-side")]
+            ClientSide,
+        }
+
         /// <summary>
         /// Gets or sets the Editor User Interface scale. Applied to all UI elements, windows and text. Can be used to scale the interface up on a bigger display. Editor restart required.
         /// </summary>
@@ -268,7 +298,14 @@ namespace FlaxEditor.Options
         [EditorDisplay("Interface"), EditorOrder(322)]
         public bool ScrollToScriptOnAdd { get; set; } = true;
 
-#if PLATFORM_WINDOWS
+#if PLATFORM_SDL
+        /// <summary>
+        /// Gets or sets a value indicating whether use native window title bar decorations in child windows. Editor restart required.
+        /// </summary>
+        [DefaultValue(WindowDecorationsType.AutoChildOnly)]
+        [EditorDisplay("Interface"), EditorOrder(70), Tooltip("Determines whether use native window title bar decorations. Editor restart required.")]
+        public WindowDecorationsType WindowDecorations { get; set; } = WindowDecorationsType.AutoChildOnly;
+#elif PLATFORM_WINDOWS
         /// <summary>
         /// Gets or sets a value indicating whether use native window title bar. Editor restart required.
         /// </summary>
@@ -277,7 +314,7 @@ namespace FlaxEditor.Options
         public bool UseNativeWindowSystem { get; set; } = false;
 #endif
 
-#if PLATFORM_WINDOWS
+#if PLATFORM_SDL || PLATFORM_WINDOWS
         /// <summary>
         /// Gets or sets a value indicating whether a window containing a single tabs hides the tab bar. Editor restart recommended.
         /// </summary>
@@ -287,7 +324,7 @@ namespace FlaxEditor.Options
 #endif
 
         /// <summary>
-        /// Gets or sets a value indicating wether the minum tab width should be used. Editor restart required.
+        /// Gets or sets a value indicating whether the minimum tab width should be used. Editor restart required.
         /// </summary>
         [DefaultValue(false)]
         [EditorDisplay("Tabs & Windows"), EditorOrder(99)]
@@ -498,7 +535,7 @@ namespace FlaxEditor.Options
         public float ConnectionCurvature { get; set; } = 1.0f;
 
         /// <summary>
-        /// Gets or sets a value that indicates wether the context menu description panel is shown or not.
+        /// Gets or sets a value that indicates whether the context menu description panel is shown or not.
         /// </summary>
         [DefaultValue(true)]
         [EditorDisplay("Visject"), EditorOrder(550), Tooltip("Shows/hides the description panel in visual scripting context menu.")]