Added tooltip to nodes to better explain their functionality.

Readded node deletion.

Scripts/Core/ResourceLoader.cs

@@ -151,4 +151,9 @@ public static class ResourceLoader
 
 		return result;
 	}
+
+	public static Texture2D LoadDSLTooltip(string title)
+	{
+		return GD.Load<Texture2D>($"res://Assets/Images/Nodes/{title.ToLower()}.png");
+	}
 }

Scripts/DSL/Nodes/IfNode.cs

@@ -19,6 +19,12 @@ public class IfNode : ProgramNode
 			return NodeResult.FAILURE;
 		}
 
+		if (comparator == null)
+		{
+			lastExecutionMessage = "No comparator selected";
+			return NodeResult.FAILURE;
+		}
+
 		bool isConditionFulfilled = DetermineCondition();
 		return isConditionFulfilled ? NodeResult.SUCCESS : NodeResult.CONDITIONFALSE;
 	}

Scripts/DSL/Nodes/WhileNode.cs

@@ -19,6 +19,12 @@ public class WhileNode : ProgramNode
 			return NodeResult.FAILURE;
 		}
 
+		if (comparator == null)
+		{
+			lastExecutionMessage = "No comparator selected";
+			return NodeResult.FAILURE;
+		}
+
 		bool isConditionFulfilled = DetermineCondition();
 		return isConditionFulfilled ? NodeResult.SUCCESS : NodeResult.CONDITIONFALSE;
 	}

Scripts/UI/DSL/CodingWindow.cs

@@ -11,8 +11,10 @@ public partial class CodingWindow : PanelContainer
 	[Export] OptionButton availableScripts;
 	[Export] LineEdit scriptName;
 	[Export] LineEdit nameInput;
+	[Export] NodeTooltip nodeTooltip;
 
 	public System.Collections.Generic.Dictionary<ProgramNode, PackedScene> DSLNodes;
+	public NodeDisplay selectedNode;
 
 	public override void _Ready()
 	{
@@ -28,6 +30,29 @@ public partial class CodingWindow : PanelContainer
 		}
 	}
 
+    public override void _Process(double delta)
+	{
+		if (Input.IsActionJustPressed("delete_node"))
+		{
+			Control focused = GetViewport().GuiGetFocusOwner();
+
+			if (focused is LineEdit || focused is TextEdit) return;
+			if (selectedNode == null) return;
+			editorWindow.RemoveChild(selectedNode);
+			selectedNode.QueueFree();
+		}
+	}
+
+	public void OnNodeSelect(NodeDisplay node)
+	{
+		selectedNode = node;
+	}
+
+	public void OnNodeDeselect(NodeDisplay node)
+	{
+		selectedNode = null;
+	}
+
 	private void LoadWindow()
 	{
 		if (robot == null) return;
@@ -76,6 +101,14 @@ public partial class CodingWindow : PanelContainer
 			{
 				AddEditorNode(nodeTemplate);
 			};
+			nodeListButton.MouseEntered += () =>
+			{
+				nodeTooltip.ShowTooltip(nodeTemplate.DisplayText, nodeTemplate.DisplayText, nodeListButton);
+			};
+			nodeListButton.MouseExited += () =>
+			{
+				nodeTooltip.HideTooltip();
+			};
 			codeBlocks.AddChild(nodeListButton);
 		}
 	}
@@ -85,7 +118,6 @@ public partial class CodingWindow : PanelContainer
 		NodeDisplay editorDisplay = DSLNodes[node].Instantiate<NodeDisplay>();
 		editorDisplay.PositionOffset = GetVisibleGraphCenter() - editorDisplay.Size / 2f;
 		editorWindow.AddChild(editorDisplay);
-		RegisterEditorNode(editorDisplay);
 	}
 
 	private Vector2 GetVisibleGraphCenter()
@@ -93,15 +125,6 @@ public partial class CodingWindow : PanelContainer
 		return (editorWindow.ScrollOffset + editorWindow.Size / 2f) / editorWindow.Zoom;
 	}
 
-	private void RegisterEditorNode(NodeDisplay editorDisplay)
-	{
-		editorDisplay.OnDeleteNode += () =>
-		{
-			editorWindow.RemoveChild(editorDisplay);
-			editorDisplay.QueueFree();
-		};
-	}
-
 	public void ClearWindow()
 	{
 		DisconnectAllNodes();
@@ -176,7 +199,6 @@ public partial class CodingWindow : PanelContainer
 	private void AddLoadedNode(NodeDisplay nodeDisplay)
 	{
 		editorWindow.AddChild(nodeDisplay);
-		RegisterEditorNode(nodeDisplay);
 	}
 
 	public void LoadTemporaryProgram()

Scripts/UI/DSL/NodeDisplay.cs

@@ -5,9 +5,6 @@ public partial class NodeDisplay : GraphNode
 {
 	public ProgramNode node;
 
-	[Signal]
-	public delegate void OnDeleteNodeEventHandler();
-
 	public override void _Ready()
 	{
 		if (node == null)
@@ -20,11 +17,6 @@ public partial class NodeDisplay : GraphNode
 		SetupDisplay();
 	}
 
-	public void DeleteNodePressed()
-	{
-		EmitSignal(SignalName.OnDeleteNode);
-	}
-
 	public static NodeDisplay Load(
 		string nodeName,
 		string content,

Scripts/UI/DSL/NodeDisplays/IfNodeDisplay.cs

@@ -41,6 +41,7 @@ public partial class IfNodeDisplay : NodeDisplay
 		ifNode.amount = (int)valueContainer.GetNode<SpinBox>("./Amount").Value;
 
 		OptionButton comparators = valueContainer.GetNode<OptionButton>("./Comparator");
+		if(comparators.GetSelectedId() == -1) return;
 		ifNode.comparator = comparators.GetItemText(comparators.GetSelectedId());
 	}
 

Scripts/UI/DSL/NodeDisplays/WhileNodeDisplay.cs

@@ -41,6 +41,7 @@ public partial class WhileNodeDisplay : NodeDisplay
 		whileNode.amount = (int)valueContainer.GetNode<SpinBox>("./Amount").Value;
 
 		OptionButton comparators = valueContainer.GetNode<OptionButton>("./Comparator");
+		if(comparators.GetSelectedId() == -1) return;
 		whileNode.comparator = comparators.GetItemText(comparators.GetSelectedId());
 	}
 

Scripts/UI/DSL/NodeTooltip.cs

@@ -0,0 +1,24 @@
+using Godot;
+
+public partial class NodeTooltip : PanelContainer
+{
+	[Export] RichTextLabel title;
+	[Export] TextureRect image;
+	[Export] RichTextLabel description;
+
+	private static Vector2 spacing = new Vector2(5, 0);
+
+	public void ShowTooltip(string titleText, string descriptionText, Button button)
+	{
+		title.Text = titleText;
+		image.Texture = ResourceLoader.LoadDSLTooltip(titleText);
+		description.Text = descriptionText;
+		Show();
+		Position = button.GlobalPosition - spacing - new Vector2(Size.X, Size.Y/2);
+	}
+
+	public void HideTooltip()
+	{
+		Hide();
+	}
+}

Scripts/UI/DSL/NodeTooltip.cs.uid

@@ -0,0 +1 @@
+uid://dx5oy38ochrw2