Profiles - Added system that displays when a layer is causing errors

src/Artemis.Core/Models/BreakableModel.cs

@@ -0,0 +1,92 @@
+using System;
+using System.Collections.Generic;
+
+namespace Artemis.Core
+{
+    /// <summary>
+    ///     Provides a default implementation for models that can have a broken state
+    /// </summary>
+    public abstract class BreakableModel : CorePropertyChanged, IBreakableModel
+    {
+        private string? _brokenState;
+        private Exception? _brokenStateException;
+        
+        /// <summary>
+        ///     Invokes the <see cref="BrokenStateChanged" /> event
+        /// </summary>
+        protected virtual void OnBrokenStateChanged()
+        {
+            BrokenStateChanged?.Invoke(this, EventArgs.Empty);
+        }
+
+        /// <inheritdoc />
+        public abstract string BrokenDisplayName { get; }
+
+        /// <summary>
+        ///     Gets or sets the broken state of this breakable model, if <see langword="null" /> this model is not broken.
+        ///     <para>Note: If setting this manually you are also responsible for invoking <see cref="BrokenStateChanged" /></para>
+        /// </summary>
+        public string? BrokenState
+        {
+            get => _brokenState;
+            set => SetAndNotify(ref _brokenState, value);
+        }
+
+        /// <summary>
+        ///     Gets or sets the exception that caused the broken state
+        ///     <para>Note: If setting this manually you are also responsible for invoking <see cref="BrokenStateChanged" /></para>
+        /// </summary>
+        public Exception? BrokenStateException
+        {
+            get => _brokenStateException;
+            set => SetAndNotify(ref _brokenStateException, value);
+        }
+
+        /// <inheritdoc />
+        public bool TryOrBreak(Action action, string breakMessage)
+        {
+            try
+            {
+                action();
+                ClearBrokenState(breakMessage);
+                return true;
+            }
+            catch (Exception e)
+            {
+                SetBrokenState(breakMessage, e);
+                return false;
+            }
+        }
+
+        /// <inheritdoc />
+        public void SetBrokenState(string state, Exception? exception)
+        {
+            BrokenState = state ?? throw new ArgumentNullException(nameof(state));
+            BrokenStateException = exception;
+            OnBrokenStateChanged();
+        }
+
+        /// <inheritdoc />
+        public void ClearBrokenState(string state)
+        {
+            if (state == null) throw new ArgumentNullException(nameof(state));
+            if (BrokenState == null)
+                return;
+
+            if (BrokenState != state) return;
+            BrokenState = null;
+            BrokenStateException = null;
+            OnBrokenStateChanged();
+        }
+
+        /// <inheritdoc />
+        public virtual IEnumerable<IBreakableModel> GetBrokenHierarchy()
+        {
+            if (BrokenState != null)
+                yield return this;
+        }
+
+        /// <inheritdoc />
+        public event EventHandler? BrokenStateChanged;
+    }
+}

src/Artemis.Core/Models/IBreakableModel.cs

@@ -0,0 +1,59 @@
+using System;
+using System.Collections.Generic;
+
+namespace Artemis.Core
+{
+    /// <summary>
+    ///     Represents a model that can have a broken state
+    /// </summary>
+    public interface IBreakableModel
+    {
+        /// <summary>
+        ///     Gets the display name of this breakable model
+        /// </summary>
+        string BrokenDisplayName { get; }
+
+        /// <summary>
+        ///     Gets or sets the broken state of this breakable model, if <see langword="null" /> this model is not broken.
+        /// </summary>
+        string? BrokenState { get; set; }
+
+        /// <summary>
+        ///     Gets or sets the exception that caused the broken state
+        /// </summary>
+        Exception? BrokenStateException { get; set; }
+
+        /// <summary>
+        ///     Try to execute the provided action. If the action succeeded the broken state is cleared if it matches
+        ///     <see paramref="breakMessage" />, if the action throws an exception <see cref="BrokenState" /> and
+        ///     <see cref="BrokenStateException" /> are set accordingly.
+        /// </summary>
+        /// <param name="action">The action to attempt to execute</param>
+        /// <param name="breakMessage">The message to clear on succeed or set on failure (exception)</param>
+        /// <returns><see langword="true" /> if the action succeeded; otherwise <see langword="false" />.</returns>
+        bool TryOrBreak(Action action, string breakMessage);
+
+        /// <summary>
+        ///     Sets the broken state to the provided state and optional exception.
+        /// </summary>
+        /// <param name="state">The state to set the broken state to</param>
+        /// <param name="exception">The exception that caused the broken state</param>
+        public void SetBrokenState(string state, Exception? exception);
+
+        /// <summary>
+        ///     Clears the broken state and exception if <see cref="BrokenState" /> equals <see paramref="state"></see>.
+        /// </summary>
+        /// <param name="state"></param>
+        public void ClearBrokenState(string state);
+        
+        /// <summary>
+        ///     Returns a list containing all broken models, including self and any children
+        /// </summary>
+        IEnumerable<IBreakableModel> GetBrokenHierarchy();
+
+        /// <summary>
+        ///     Occurs when the broken state of this model changes
+        /// </summary>
+        event EventHandler BrokenStateChanged;
+    }
+}

src/Artemis.Core/Models/Profile/Folder.cs

@@ -183,18 +183,15 @@ namespace Artemis.Core
 
             lock (Timeline)
             {
-                foreach (BaseLayerEffect baseLayerEffect in LayerEffects.Where(e => !e.Suspended))
-                {
-                    baseLayerEffect.BaseProperties?.Update(Timeline);
-                    baseLayerEffect.Update(Timeline.Delta.TotalSeconds);
-                }
+                foreach (BaseLayerEffect baseLayerEffect in LayerEffects.Where(e => !e.Suspended)) 
+                    baseLayerEffect.InternalUpdate(Timeline);
 
                 SKPaint layerPaint = new() {FilterQuality = SKFilterQuality.Low};
                 try
                 {
                     SKRectI rendererBounds = SKRectI.Create(0, 0, Bounds.Width, Bounds.Height);
                     foreach (BaseLayerEffect baseLayerEffect in LayerEffects.Where(e => !e.Suspended))
-                        baseLayerEffect.PreProcess(canvas, rendererBounds, layerPaint);
+                        baseLayerEffect.InternalPreProcess(canvas, rendererBounds, layerPaint);
 
                     // No point rendering if the alpha was set to zero by one of the effects
                     if (layerPaint.Color.Alpha == 0)
@@ -208,7 +205,7 @@ namespace Artemis.Core
                         Children[index].Render(canvas, new SKPointI(Bounds.Left, Bounds.Top));
 
                     foreach (BaseLayerEffect baseLayerEffect in LayerEffects.Where(e => !e.Suspended))
-                        baseLayerEffect.PostProcess(canvas, rendererBounds, layerPaint);
+                        baseLayerEffect.InternalPostProcess(canvas, rendererBounds, layerPaint);
                 }
                 finally
                 {
@@ -228,8 +225,6 @@ namespace Artemis.Core
             if (Enabled)
                 return;
 
-            Debug.WriteLine($"Enabling {this}");
-
             foreach (BaseLayerEffect baseLayerEffect in LayerEffects)
                 baseLayerEffect.InternalEnable();
 
@@ -248,8 +243,6 @@ namespace Artemis.Core
             if (!Enabled)
                 return;
 
-            Debug.WriteLine($"Disabled {this}");
-
             foreach (BaseLayerEffect baseLayerEffect in LayerEffects)
                 baseLayerEffect.InternalDisable();
 
@@ -344,5 +337,15 @@ namespace Artemis.Core
         {
             RenderPropertiesUpdated?.Invoke(this, EventArgs.Empty);
         }
+
+        #region Overrides of BreakableModel
+
+        /// <inheritdoc />
+        public override IEnumerable<IBreakableModel> GetBrokenHierarchy()
+        {
+            return LayerEffects.Where(e => e.BrokenState != null);
+        }
+
+        #endregion
     }
 }

src/Artemis.Core/Models/Profile/Layer.cs

@@ -206,6 +206,7 @@ namespace Artemis.Core
                 GetType().GetProperty(nameof(Transform))!,
                 typeof(PropertyGroupDescriptionAttribute)
             )!;
+
             General.GroupDescription = (PropertyGroupDescriptionAttribute) generalAttribute;
             General.Initialize(this, "General.", Constants.CorePluginFeature);
             Transform.GroupDescription = (PropertyGroupDescriptionAttribute) transformAttribute;
@@ -288,7 +289,7 @@ namespace Artemis.Core
 
             // Adaption hints
             Adapter.Save();
-            
+
             SaveRenderElement();
         }
 
@@ -320,7 +321,7 @@ namespace Artemis.Core
         {
             if (Disposed)
                 throw new ObjectDisposedException("Layer");
-            
+
             UpdateDisplayCondition();
             UpdateTimeline(deltaTime);
 
@@ -366,9 +367,17 @@ namespace Artemis.Core
             if (Enabled)
                 return;
 
-            LayerBrush?.InternalEnable();
-            foreach (BaseLayerEffect baseLayerEffect in LayerEffects)
-                baseLayerEffect.InternalEnable();
+            bool tryOrBreak = TryOrBreak(() => LayerBrush?.InternalEnable(), "Failed to enable layer brush");
+            if (!tryOrBreak)
+                return;
+
+            tryOrBreak = TryOrBreak(() =>
+            {
+                foreach (BaseLayerEffect baseLayerEffect in LayerEffects)
+                    baseLayerEffect.InternalEnable();
+            }, "Failed to enable one or more effects");
+            if (!tryOrBreak)
+                return;
 
             Enabled = true;
         }
@@ -393,17 +402,10 @@ namespace Artemis.Core
 
             General.Update(timeline);
             Transform.Update(timeline);
-            if (LayerBrush != null)
-            {
-                LayerBrush.BaseProperties?.Update(timeline);
-                LayerBrush.Update(timeline.Delta.TotalSeconds);
-            }
+            LayerBrush?.InternalUpdate(timeline);
 
             foreach (BaseLayerEffect baseLayerEffect in LayerEffects.Where(e => !e.Suspended))
-            {
-                baseLayerEffect.BaseProperties?.Update(timeline);
-                baseLayerEffect.Update(timeline.Delta.TotalSeconds);
-            }
+                baseLayerEffect.InternalUpdate(timeline);
         }
 
         private void RenderTimeline(Timeline timeline, SKCanvas canvas, SKPointI basePosition)
@@ -477,9 +479,9 @@ namespace Artemis.Core
         {
             if (LayerBrush == null)
                 throw new ArtemisCoreException("The layer is not yet ready for rendering");
-            
+
             foreach (BaseLayerEffect baseLayerEffect in LayerEffects.Where(e => !e.Suspended))
-                baseLayerEffect.PreProcess(canvas, bounds, layerPaint);
+                baseLayerEffect.InternalPreProcess(canvas, bounds, layerPaint);
 
             try
             {
@@ -492,7 +494,7 @@ namespace Artemis.Core
                 LayerBrush.InternalRender(canvas, bounds, layerPaint);
 
                 foreach (BaseLayerEffect baseLayerEffect in LayerEffects.Where(e => !e.Suspended))
-                    baseLayerEffect.PostProcess(canvas, bounds, layerPaint);
+                    baseLayerEffect.InternalPostProcess(canvas, bounds, layerPaint);
             }
 
             finally
@@ -722,16 +724,24 @@ namespace Artemis.Core
 
         internal void ActivateLayerBrush()
         {
-            LayerBrushReference? current = General.BrushReference.CurrentValue;
-            if (current == null)
-                return;
+            try
+            {
+                LayerBrushReference? current = General.BrushReference.CurrentValue;
+                if (current == null)
+                    return;
 
-            LayerBrushDescriptor? descriptor = current.LayerBrushProviderId != null && current.BrushType != null
-                ? LayerBrushStore.Get(current.LayerBrushProviderId, current.BrushType)?.LayerBrushDescriptor
-                : null;
-            descriptor?.CreateInstance(this);
+                LayerBrushDescriptor? descriptor = current.LayerBrushProviderId != null && current.BrushType != null
+                    ? LayerBrushStore.Get(current.LayerBrushProviderId, current.BrushType)?.LayerBrushDescriptor
+                    : null;
+                descriptor?.CreateInstance(this);
 
-            OnLayerBrushUpdated();
+                OnLayerBrushUpdated();
+                ClearBrokenState("Failed to initialize layer brush");
+            }
+            catch (Exception e)
+            {
+                SetBrokenState("Failed to initialize layer brush", e);
+            }
         }
 
         internal void DeactivateLayerBrush()
@@ -747,6 +757,19 @@ namespace Artemis.Core
         }
 
         #endregion
+
+        #region Overrides of BreakableModel
+
+        /// <inheritdoc />
+        public override IEnumerable<IBreakableModel> GetBrokenHierarchy()
+        {
+            if (LayerBrush?.BrokenState != null)
+                yield return LayerBrush;
+            foreach (BaseLayerEffect baseLayerEffect in LayerEffects.Where(e => e.BrokenState != null))
+                yield return baseLayerEffect;
+        }
+
+        #endregion
     }
 
     /// <summary>

src/Artemis.Core/Models/Profile/Profile.cs

@@ -27,6 +27,7 @@ namespace Artemis.Core
 
             UndoStack = new MaxStack<string>(20);
             RedoStack = new MaxStack<string>(20);
+            Exceptions = new List<Exception>();
 
             Load();
         }
@@ -77,6 +78,7 @@ namespace Artemis.Core
 
         internal MaxStack<string> UndoStack { get; set; }
         internal MaxStack<string> RedoStack { get; set; }
+        internal List<Exception> Exceptions { get; }
 
         /// <inheritdoc />
         public override void Update(double deltaTime)
@@ -113,6 +115,13 @@ namespace Artemis.Core
 
                 foreach (ProfileScript profileScript in Scripts)
                     profileScript.OnProfileRendered(canvas, canvas.LocalClipBounds);
+
+                if (!Exceptions.Any())
+                    return;
+
+                List<Exception> exceptions = new(Exceptions);
+                Exceptions.Clear();
+                throw new AggregateException($"One or more exceptions while rendering profile {Name}", exceptions);
             }
         }
 
@@ -238,5 +247,18 @@ namespace Artemis.Core
                 ProfileEntity.ScriptConfigurations.Add(scriptConfiguration.Entity);
             }
         }
+
+        #region Overrides of BreakableModel
+
+        /// <inheritdoc />
+        public override IEnumerable<IBreakableModel> GetBrokenHierarchy()
+        {
+            foreach (IBreakableModel breakableModel in GetAllFolders().SelectMany(folders => folders.GetBrokenHierarchy()))
+                yield return breakableModel;
+            foreach (IBreakableModel breakableModel in GetAllLayers().SelectMany(layer => layer.GetBrokenHierarchy()))
+                yield return breakableModel;
+        }
+
+        #endregion
     }
 }

src/Artemis.Core/Models/Profile/ProfileElement.cs

@@ -9,7 +9,7 @@ namespace Artemis.Core
     /// <summary>
     ///     Represents an element of a <see cref="Profile" />
     /// </summary>
-    public abstract class ProfileElement : CorePropertyChanged, IDisposable
+    public abstract class ProfileElement : BreakableModel, IDisposable
     {
         private Guid _entityId;
         private string? _name;
@@ -25,7 +25,7 @@ namespace Artemis.Core
             _profile = profile;
             ChildrenList = new List<ProfileElement>();
         }
-        
+
         /// <summary>
         ///     Gets the unique ID of this profile element
         /// </summary>
@@ -121,6 +121,13 @@ namespace Artemis.Core
             return $"{nameof(EntityId)}: {EntityId}, {nameof(Order)}: {Order}, {nameof(Name)}: {Name}";
         }
 
+        #region Overrides of BreakableModel
+
+        /// <inheritdoc />
+        public override string BrokenDisplayName => Name ?? GetType().Name;
+
+        #endregion
+
         #region Hierarchy
 
         /// <summary>
@@ -234,7 +241,7 @@ namespace Artemis.Core
         internal abstract void Save();
 
         #endregion
-
+        
         #region IDisposable
 
         /// <inheritdoc />

src/Artemis.Core/Plugins/LayerBrushes/Internal/BaseLayerBrush.cs

@@ -8,7 +8,7 @@ namespace Artemis.Core.LayerBrushes
     /// <summary>
     ///     For internal use only, please use <see cref="LayerBrush{T}" /> or <see cref="PerLedLayerBrush{T}" /> or instead
     /// </summary>
-    public abstract class BaseLayerBrush : CorePropertyChanged, IDisposable
+    public abstract class BaseLayerBrush : BreakableModel, IDisposable
     {
         private LayerBrushType _brushType;
         private ILayerBrushConfigurationDialog? _configurationDialog;
@@ -134,6 +134,12 @@ namespace Artemis.Core.LayerBrushes
             }
         }
 
+        internal void InternalUpdate(Timeline timeline)
+        {
+            BaseProperties?.Update(timeline);
+            TryOrBreak(() => Update(timeline.Delta.TotalSeconds), "Failed to update");
+        }
+
         /// <summary>
         ///     Enables the layer brush if it isn't already enabled
         /// </summary>
@@ -142,7 +148,9 @@ namespace Artemis.Core.LayerBrushes
             if (Enabled)
                 return;
 
-            EnableLayerBrush();
+            if (!TryOrBreak(EnableLayerBrush, "Failed to enable"))
+                return;
+
             Enabled = true;
         }
 
@@ -170,6 +178,13 @@ namespace Artemis.Core.LayerBrushes
             Dispose(true);
             GC.SuppressFinalize(this);
         }
+
+        #region Overrides of BreakableModel
+
+        /// <inheritdoc />
+        public override string BrokenDisplayName => Descriptor.DisplayName;
+
+        #endregion
     }
 
     /// <summary>

src/Artemis.Core/Plugins/LayerBrushes/LayerBrush.cs

@@ -28,12 +28,12 @@ namespace Artemis.Core.LayerBrushes
 
         internal override void InternalRender(SKCanvas canvas, SKRect bounds, SKPaint paint)
         {
-            Render(canvas, bounds, paint);
+            TryOrBreak(() => Render(canvas, bounds, paint), "Failed to render");
         }
 
         internal override void Initialize()
         {
-            InitializeProperties();
+            TryOrBreak(InitializeProperties, "Failed to initialize");
         }
     }
 }

src/Artemis.Core/Plugins/LayerBrushes/PerLedLayerBrush.cs

@@ -31,7 +31,7 @@ namespace Artemis.Core.LayerBrushes
         internal override void InternalRender(SKCanvas canvas, SKRect bounds, SKPaint paint)
         {
             // We don't want rotation on this canvas because that'll displace the LEDs, translations are applied to the points of each LED instead
-            if (Layer.General.TransformMode.CurrentValue == LayerTransformMode.Normal && SupportsTransformation) 
+            if (Layer.General.TransformMode.CurrentValue == LayerTransformMode.Normal && SupportsTransformation)
                 canvas.SetMatrix(canvas.TotalMatrix.PreConcat(Layer.GetTransformMatrix(true, false, false, true).Invert()));
 
             using SKPath pointsPath = new();
@@ -46,34 +46,38 @@ namespace Artemis.Core.LayerBrushes
             }
 
             // Apply the translation to the points of each LED instead
-            if (Layer.General.TransformMode.CurrentValue == LayerTransformMode.Normal && SupportsTransformation) 
+            if (Layer.General.TransformMode.CurrentValue == LayerTransformMode.Normal && SupportsTransformation)
                 pointsPath.Transform(Layer.GetTransformMatrix(true, true, true, true).Invert());
 
             SKPoint[] points = pointsPath.Points;
-            for (int index = 0; index < Layer.Leds.Count; index++)
+
+            TryOrBreak(() =>
             {
-                ArtemisLed artemisLed = Layer.Leds[index];
-                SKPoint renderPoint = points[index * 2 + 1];
-                if (!float.IsFinite(renderPoint.X) || !float.IsFinite(renderPoint.Y))
-                    continue;
+                for (int index = 0; index < Layer.Leds.Count; index++)
+                {
+                    ArtemisLed artemisLed = Layer.Leds[index];
+                    SKPoint renderPoint = points[index * 2 + 1];
+                    if (!float.IsFinite(renderPoint.X) || !float.IsFinite(renderPoint.Y))
+                        continue;
 
-                // Let the brush determine the color
-                ledPaint.Color = GetColor(artemisLed, renderPoint);
+                    // Let the brush determine the color
+                    ledPaint.Color = GetColor(artemisLed, renderPoint);
 
-                SKRect ledRectangle = SKRect.Create(
-                    artemisLed.AbsoluteRectangle.Left - Layer.Bounds.Left,
-                    artemisLed.AbsoluteRectangle.Top - Layer.Bounds.Top,
-                    artemisLed.AbsoluteRectangle.Width,
-                    artemisLed.AbsoluteRectangle.Height
-                );
+                    SKRect ledRectangle = SKRect.Create(
+                        artemisLed.AbsoluteRectangle.Left - Layer.Bounds.Left,
+                        artemisLed.AbsoluteRectangle.Top - Layer.Bounds.Top,
+                        artemisLed.AbsoluteRectangle.Width,
+                        artemisLed.AbsoluteRectangle.Height
+                    );
 
-                canvas.DrawRect(ledRectangle, ledPaint);
-            }
+                    canvas.DrawRect(ledRectangle, ledPaint);
+                }
+            }, "Failed to render");
         }
 
         internal override void Initialize()
         {
-            InitializeProperties();
+            TryOrBreak(InitializeProperties, "Failed to initialize");
         }
     }
 }

src/Artemis.Core/Plugins/LayerEffects/Internal/BaseLayerEffect.cs

@@ -1,5 +1,4 @@
 using System;
-using Artemis.Core.Services;
 using SkiaSharp;
 
 namespace Artemis.Core.LayerEffects
@@ -7,7 +6,7 @@ namespace Artemis.Core.LayerEffects
     /// <summary>
     ///     For internal use only, please use <see cref="LayerEffect{T}" /> instead
     /// </summary>
-    public abstract class BaseLayerEffect : CorePropertyChanged, IDisposable
+    public abstract class BaseLayerEffect : BreakableModel, IDisposable
     {
         private ILayerEffectConfigurationDialog? _configurationDialog;
         private LayerEffectDescriptor _descriptor;
@@ -182,6 +181,22 @@ namespace Artemis.Core.LayerEffects
 
         internal virtual string GetEffectTypeName() => GetType().Name;
 
+        internal void InternalUpdate(Timeline timeline)
+        {
+            BaseProperties?.Update(timeline);
+            TryOrBreak(() => Update(timeline.Delta.TotalSeconds), "Failed to update");
+        }
+
+        internal void InternalPreProcess(SKCanvas canvas, SKRect renderBounds, SKPaint paint)
+        {
+            TryOrBreak(() => PreProcess(canvas, renderBounds, paint), "Failed to pre-process");
+        }
+
+        internal void InternalPostProcess(SKCanvas canvas, SKRect renderBounds, SKPaint paint)
+        {
+            TryOrBreak(() => PostProcess(canvas, renderBounds, paint), "Failed to post-process");
+        }
+
         /// <summary>
         ///     Enables the layer effect if it isn't already enabled
         /// </summary>
@@ -205,5 +220,12 @@ namespace Artemis.Core.LayerEffects
             DisableLayerEffect();
             Enabled = false;
         }
+
+        #region Overrides of BreakableModel
+
+        /// <inheritdoc />
+        public override string BrokenDisplayName => Name;
+
+        #endregion
     }
 }

src/Artemis.UI.Shared/Screens/Exceptions/ExceptionView.xaml

@@ -10,7 +10,7 @@
                          xmlns:avalonedit="http://icsharpcode.net/sharpdevelop/avalonedit"
                          xmlns:s="https://github.com/canton7/Stylet"
                          mc:Ignorable="d"
-                         Title="Unhandled exception"
+                         Title="Exception | Artemis"
                          Background="{DynamicResource MaterialDesignPaper}"
                          FontFamily="pack://application:,,,/MaterialDesignThemes.Wpf;component/Resources/Roboto/#Roboto"
                          UseLayoutRounding="True"

src/Artemis.UI/Screens/ProfileEditor/LayerProperties/LayerPropertiesViewModel.cs

@@ -501,11 +501,17 @@ namespace Artemis.UI.Screens.ProfileEditor.LayerProperties
 
         public void GoToEnd()
         {
+            if (SelectedProfileElement == null)
+                return;
+
             ProfileEditorService.CurrentTime = SelectedProfileElement.Timeline.EndSegmentEndPosition;
         }
 
         public void GoToPreviousFrame()
         {
+            if (SelectedProfileElement == null)
+                return;
+
             double frameTime = 1000.0 / SettingsService.GetSetting("Core.TargetFrameRate", 25).Value;
             double newTime = Math.Max(0, Math.Round((ProfileEditorService.CurrentTime.TotalMilliseconds - frameTime) / frameTime) * frameTime);
             ProfileEditorService.CurrentTime = TimeSpan.FromMilliseconds(newTime);
@@ -513,6 +519,9 @@ namespace Artemis.UI.Screens.ProfileEditor.LayerProperties
 
         public void GoToNextFrame()
         {
+            if (SelectedProfileElement == null)
+                return;
+
             double frameTime = 1000.0 / SettingsService.GetSetting("Core.TargetFrameRate", 25).Value;
             double newTime = Math.Round((ProfileEditorService.CurrentTime.TotalMilliseconds + frameTime) / frameTime) * frameTime;
             newTime = Math.Min(newTime, SelectedProfileElement.Timeline.EndSegmentEndPosition.TotalMilliseconds);

src/Artemis.UI/Screens/ProfileEditor/ProfileTree/ProfileTreeViewModel.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Linq;
 using System.Threading.Tasks;
+using System.Timers;
 using System.Windows;
 using System.Windows.Input;
 using Artemis.Core;
@@ -20,11 +21,13 @@ namespace Artemis.UI.Screens.ProfileEditor.ProfileTree
         private bool _draggingTreeView;
         private TreeItemViewModel _selectedTreeItem;
         private bool _updatingTree;
+        private readonly Timer _timer;
 
         public ProfileTreeViewModel(IProfileEditorService profileEditorService, IProfileTreeVmFactory profileTreeVmFactory)
         {
             _profileEditorService = profileEditorService;
             _profileTreeVmFactory = profileTreeVmFactory;
+            _timer = new Timer(500);
         }
 
         public TreeItemViewModel SelectedTreeItem
@@ -54,12 +57,15 @@ namespace Artemis.UI.Screens.ProfileEditor.ProfileTree
         {
             Subscribe();
             CreateRootFolderViewModel();
+            _timer.Start();
             base.OnInitialActivate();
         }
 
         protected override void OnClose()
         {
             Unsubscribe();
+            _timer.Stop();
+            _timer.Dispose();
             base.OnClose();
         }
 
@@ -203,12 +209,14 @@ namespace Artemis.UI.Screens.ProfileEditor.ProfileTree
         {
             _profileEditorService.SelectedProfileChanged += OnSelectedProfileChanged;
             _profileEditorService.SelectedProfileElementChanged += OnSelectedProfileElementChanged;
+            _timer.Elapsed += TimerOnElapsed;
         }
 
         private void Unsubscribe()
         {
             _profileEditorService.SelectedProfileChanged -= OnSelectedProfileChanged;
             _profileEditorService.SelectedProfileElementChanged -= OnSelectedProfileElementChanged;
+            _timer.Elapsed -= TimerOnElapsed;
         }
 
         private void OnSelectedProfileElementChanged(object sender, RenderProfileElementEventArgs e)
@@ -242,6 +250,11 @@ namespace Artemis.UI.Screens.ProfileEditor.ProfileTree
             CreateRootFolderViewModel();
         }
 
+        private void TimerOnElapsed(object sender, ElapsedEventArgs e)
+        {
+            ActiveItem?.UpdateBrokenState();
+        }
+
         #endregion
     }
 

src/Artemis.UI/Screens/ProfileEditor/ProfileTree/TreeItem/FolderView.xaml

@@ -1,17 +1,20 @@
 <UserControl
-             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
-             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
-             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
-             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
-             xmlns:s="https://github.com/canton7/Stylet"
-             xmlns:materialDesign="http://materialdesigninxaml.net/winfx/xaml/themes"
-             xmlns:treeItem1="clr-namespace:Artemis.UI.Screens.ProfileEditor.ProfileTree.TreeItem"
-             xmlns:Converters="clr-namespace:Artemis.UI.Converters" x:Class="Artemis.UI.Screens.ProfileEditor.ProfileTree.TreeItem.FolderView"
-             mc:Ignorable="d"
-             d:DesignHeight="450" d:DesignWidth="800"
-             d:DataContext="{d:DesignInstance {x:Type treeItem1:FolderViewModel}}">
+    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+    xmlns:s="https://github.com/canton7/Stylet"
+    xmlns:materialDesign="http://materialdesigninxaml.net/winfx/xaml/themes"
+    xmlns:treeItem1="clr-namespace:Artemis.UI.Screens.ProfileEditor.ProfileTree.TreeItem"
+    xmlns:converters="clr-namespace:Artemis.UI.Converters"
+    xmlns:shared="clr-namespace:Artemis.UI.Shared;assembly=Artemis.UI.Shared"
+    x:Class="Artemis.UI.Screens.ProfileEditor.ProfileTree.TreeItem.FolderView"
+    mc:Ignorable="d"
+    d:DesignHeight="450" d:DesignWidth="800"
+    d:DataContext="{d:DesignInstance {x:Type treeItem1:FolderViewModel}}">
     <UserControl.Resources>
-        <Converters:InverseBooleanConverter x:Key="InverseBooleanConverter"/>
+        <converters:InverseBooleanConverter x:Key="InverseBooleanConverter" />
+        <shared:NullToVisibilityConverter x:Key="NullToVisibilityConverter" />
     </UserControl.Resources>
     <!-- Capture clicks on full tree view item -->
     <StackPanel Margin="-10" Background="Transparent" ContextMenuOpening="{s:Action ContextMenuOpening}">
@@ -58,18 +61,32 @@
         </StackPanel.ContextMenu>
         <Grid Margin="10">
             <Grid.ColumnDefinitions>
+                <ColumnDefinition Width="Auto" />
                 <ColumnDefinition Width="Auto" />
                 <ColumnDefinition Width="*" />
                 <ColumnDefinition Width="Auto" />
             </Grid.ColumnDefinitions>
-            <materialDesign:PackIcon Grid.Column="0"
+            <Button Grid.Column="0"
+                    Style="{StaticResource MaterialDesignFloatingActionMiniDarkButton}"
+                    ToolTip="{Binding BrokenState}"
+                    Visibility="{Binding BrokenState, Converter={StaticResource NullToVisibilityConverter}}"
+                    Foreground="White"
+                    Background="#E74C4C"
+                    BorderBrush="#E74C4C"
+                    Width="18"
+                    Height="18"
+                    Margin="0 0 5 0"
+                    Command="{s:Action ShowBrokenStateExceptions}">
+                <materialDesign:PackIcon Kind="AlertCircle" Height="12" Width="12" />
+            </Button>
+            <materialDesign:PackIcon Grid.Column="1"
                                      Kind="Folder"
                                      Visibility="{Binding IsExpanded, Converter={x:Static s:BoolToVisibilityConverter.InverseInstance}, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type TreeViewItem}}}" />
-            <materialDesign:PackIcon Grid.Column="0"
+            <materialDesign:PackIcon Grid.Column="1"
                                      Kind="FolderOpen"
                                      Visibility="{Binding IsExpanded, Converter={x:Static s:BoolToVisibilityConverter.Instance}, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type TreeViewItem}}}" />
-            <TextBlock Grid.Column="1" Text="{Binding ProfileElement.Name}" Margin="10 0 0 0" VerticalAlignment="Center" />
-            <ToggleButton Grid.Column="2"
+            <TextBlock Grid.Column="2" Text="{Binding ProfileElement.Name}" Margin="10 0 0 0" VerticalAlignment="Center" />
+            <ToggleButton Grid.Column="3"
                           Style="{StaticResource MaterialDesignFlatToggleButton}"
                           ToolTip="Toggle suspended state"
                           Width="18"

src/Artemis.UI/Screens/ProfileEditor/ProfileTree/TreeItem/FolderViewModel.cs

@@ -1,5 +1,9 @@
-using System.ComponentModel;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Linq;
+using System.Threading.Tasks;
 using Artemis.Core;
+using Artemis.Core.LayerEffects;
 using Artemis.Core.Services;
 using Artemis.UI.Ninject.Factories;
 using Artemis.UI.Shared.Services;
@@ -27,12 +31,28 @@ namespace Artemis.UI.Screens.ProfileEditor.ProfileTree.TreeItem
             set => ((Folder) ProfileElement).IsExpanded = value;
         }
 
+        public override void UpdateBrokenState()
+        {
+            List<IBreakableModel> brokenModels = ProfileElement.GetBrokenHierarchy().ToList();
+            if (!brokenModels.Any())
+                BrokenState = null;
+            else
+            {
+                BrokenState = "Folder is in a broken state, click to view exception(s).\r\n" +
+                              $"{string.Join("\r\n", brokenModels.Select(e => $" • {e.BrokenDisplayName} - {e.BrokenState}"))}";
+            }
+
+            foreach (TreeItemViewModel treeItemViewModel in GetChildren())
+                treeItemViewModel.UpdateBrokenState();
+        }
+
         private void ProfileElementOnPropertyChanged(object sender, PropertyChangedEventArgs e)
         {
             if (e.PropertyName == nameof(Folder.IsExpanded))
                 NotifyOfPropertyChange(nameof(IsExpanded));
         }
-        
+
+
         #region Overrides of Screen
 
         /// <inheritdoc />

src/Artemis.UI/Screens/ProfileEditor/ProfileTree/TreeItem/LayerView.xaml

@@ -6,14 +6,15 @@
     xmlns:s="https://github.com/canton7/Stylet"
     xmlns:materialDesign="http://materialdesigninxaml.net/winfx/xaml/themes"
     xmlns:treeItem1="clr-namespace:Artemis.UI.Screens.ProfileEditor.ProfileTree.TreeItem"
-    xmlns:Converters="clr-namespace:Artemis.UI.Converters"
+    xmlns:converters="clr-namespace:Artemis.UI.Converters"
     xmlns:shared="clr-namespace:Artemis.UI.Shared;assembly=Artemis.UI.Shared"
     x:Class="Artemis.UI.Screens.ProfileEditor.ProfileTree.TreeItem.LayerView"
     mc:Ignorable="d"
     d:DesignHeight="450" d:DesignWidth="800"
     d:DataContext="{d:DesignInstance {x:Type treeItem1:LayerViewModel}}">
     <UserControl.Resources>
-        <Converters:InverseBooleanConverter x:Key="InverseBooleanConverter" />
+        <converters:InverseBooleanConverter x:Key="InverseBooleanConverter" />
+        <shared:NullToVisibilityConverter x:Key="NullToVisibilityConverter" />
     </UserControl.Resources>
     <!-- Capture clicks on full tree view item -->
     <StackPanel Margin="-10" Background="Transparent" ContextMenuOpening="{s:Action ContextMenuOpening}">
@@ -55,13 +56,27 @@
         </StackPanel.ContextMenu>
         <Grid Margin="10">
             <Grid.ColumnDefinitions>
+                <ColumnDefinition Width="Auto" />
                 <ColumnDefinition Width="Auto" />
                 <ColumnDefinition Width="Auto" />
                 <ColumnDefinition Width="*" />
                 <ColumnDefinition Width="Auto" />
             </Grid.ColumnDefinitions>
-            <materialDesign:PackIcon Grid.Column="0" Kind="Layers" Width="16" VerticalAlignment="Center" />
-            <shared:ArtemisIcon Grid.Column="1"
+            <Button Grid.Column="0"
+                    Style="{StaticResource MaterialDesignFloatingActionMiniDarkButton}"
+                    ToolTip="{Binding BrokenState}"
+                    Visibility="{Binding BrokenState, Converter={StaticResource NullToVisibilityConverter}}"
+                    Foreground="White"
+                    Background="#E74C4C"
+                    BorderBrush="#E74C4C"
+                    Width="18"
+                    Height="18"
+                    Margin="0 0 5 0"
+                    Command="{s:Action ShowBrokenStateExceptions}">
+                <materialDesign:PackIcon Kind="AlertCircle" Height="12" Width="12" />
+            </Button>
+            <materialDesign:PackIcon Grid.Column="1" Kind="Layers" Width="16" VerticalAlignment="Center" />
+            <shared:ArtemisIcon Grid.Column="2"
                                 VerticalAlignment="Center"
                                 Icon="{Binding Layer.LayerBrush.Descriptor.Icon}"
                                 Width="16"
@@ -69,8 +84,8 @@
                                 ToolTip="{Binding Layer.LayerBrush.Descriptor.DisplayName, Mode=OneWay}"
                                 Visibility="{Binding ShowIcons, Converter={x:Static s:BoolToVisibilityConverter.Instance}, Mode=OneWay}"
                                 Background="Transparent" />
-            <TextBlock Grid.Column="2" Text="{Binding Layer.Name}" VerticalAlignment="Center" Margin="5 0 0 0" />
-            <ToggleButton Grid.Column="3"
+            <TextBlock Grid.Column="3" Text="{Binding Layer.Name}" VerticalAlignment="Center" Margin="5 0 0 0" />
+            <ToggleButton Grid.Column="4"
                           Style="{StaticResource MaterialDesignFlatToggleButton}"
                           Width="18"
                           Height="18"

src/Artemis.UI/Screens/ProfileEditor/ProfileTree/TreeItem/LayerViewModel.cs

@@ -1,4 +1,9 @@
-using Artemis.Core;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using Artemis.Core;
+using Artemis.Core.LayerEffects;
 using Artemis.Core.Services;
 using Artemis.UI.Ninject.Factories;
 using Artemis.UI.Shared.Services;
@@ -9,7 +14,7 @@ namespace Artemis.UI.Screens.ProfileEditor.ProfileTree.TreeItem
     public class LayerViewModel : TreeItemViewModel
     {
         private readonly IWindowManager _windowManager;
-        private ILayerHintVmFactory _vmFactory;
+        private readonly ILayerHintVmFactory _vmFactory;
 
         public LayerViewModel(ProfileElement layer,
             IRgbService rgbService,
@@ -25,15 +30,27 @@ namespace Artemis.UI.Screens.ProfileEditor.ProfileTree.TreeItem
             _vmFactory = vmFactory;
         }
 
-        public void OpenAdaptionHints()
-        {
-            _windowManager.ShowDialog(_vmFactory.LayerHintsDialogViewModel(Layer));
-        }
-
         public Layer Layer => ProfileElement as Layer;
         public bool ShowIcons => Layer?.LayerBrush != null;
         public override bool SupportsChildren => false;
 
         public override bool IsExpanded { get; set; }
+
+        public void OpenAdaptionHints()
+        {
+            _windowManager.ShowDialog(_vmFactory.LayerHintsDialogViewModel(Layer));
+        }
+
+        public override void UpdateBrokenState()
+        {
+            List<IBreakableModel> brokenModels = ProfileElement.GetBrokenHierarchy().ToList();
+            if (!brokenModels.Any())
+                BrokenState = null;
+            else
+            {
+                BrokenState = "Layer is in a broken state, click to view exception(s).\r\n" +
+                              $"{string.Join("\r\n", brokenModels.Select(e => $" • {e.BrokenDisplayName} - {e.BrokenState}"))}";
+            }
+        }
     }
 }

src/Artemis.UI/Screens/ProfileEditor/ProfileTree/TreeItem/TreeItemViewModel.cs

@@ -23,6 +23,7 @@ namespace Artemis.UI.Screens.ProfileEditor.ProfileTree.TreeItem
         private readonly IProfileTreeVmFactory _profileTreeVmFactory;
         private readonly IRgbService _rgbService;
         private ProfileElement _profileElement;
+        private string _brokenState;
 
         protected TreeItemViewModel(ProfileElement profileElement,
             IRgbService rgbService,
@@ -49,6 +50,12 @@ namespace Artemis.UI.Screens.ProfileEditor.ProfileTree.TreeItem
             set => SetAndNotify(ref _profileElement, value);
         }
 
+        public string BrokenState
+        {
+            get => _brokenState;
+            set => SetAndNotify(ref _brokenState, value);
+        }
+
         public bool CanPasteElement => _profileEditorService.GetCanPasteProfileElement();
 
         public abstract bool SupportsChildren { get; }
@@ -286,6 +293,23 @@ namespace Artemis.UI.Screens.ProfileEditor.ProfileTree.TreeItem
             NotifyOfPropertyChange(nameof(CanPasteElement));
         }
 
+        public abstract void UpdateBrokenState();
+
+        public async Task ShowBrokenStateExceptions()
+        {
+            List<IBreakableModel> broken = ProfileElement.GetBrokenHierarchy().Where(b => b.BrokenStateException != null).ToList();
+
+            foreach (IBreakableModel current in broken)
+            {
+                _dialogService.ShowExceptionDialog($"{current.BrokenDisplayName} - {current.BrokenState}", current.BrokenStateException!);
+                if (broken.Last() != current)
+                {
+                    if (!await _dialogService.ShowConfirmDialog("Broken state", "Do you want to view the next exception?"))
+                        return;
+                }
+            }
+        }
+
         private void Subscribe()
         {
             ProfileElement.ChildAdded += ProfileElementOnChildAdded;