Extend basic window with foldout and ability to add child elements to foldout

src/RollABall/Assets/Scripts/RenderSettings/Implementations/RenderSettingPreset.cs

@@ -5,6 +5,11 @@ using UnityEngine;
 public class RenderSettingPreset : IRenderSettingPreset {
 
 	private string name;
+	private HashSet<string> children;
+
+	public RenderSettingPreset() {
+			children = new HashSet<string>();
+	}
 
 	public string GetName() {
 		return name;
@@ -13,4 +18,12 @@ public class RenderSettingPreset : IRenderSettingPreset {
 	public void SetName(string name) {
 		this.name = name;
 	}
+
+	public void AddChild(string child) {
+		children.Add(child);
+	}
+
+	public HashSet<string> GetChildren() {
+		return children;
+	}
 }

src/RollABall/Assets/Scripts/RenderSettings/Interfaces/IRenderSettingPreset.cs

@@ -6,5 +6,6 @@ public interface IRenderSettingPreset {
 
 	string GetName();
 	void SetName(string name);
-
+	void AddChild(string child);
+	HashSet<string> GetChildren();
 }

src/RollABall/Assets/Scripts/RenderSettings/RenderSettingsWindow.cs

@@ -5,9 +5,13 @@ using UnityEditor;
 
 public class RenderSettingsWindow : EditorWindow {
 
-		static HashSet<IRenderSettingPreset> presets = new HashSet<IRenderSettingPreset>();
+		private static HashSet<IRenderSettingPreset> presets = new HashSet<IRenderSettingPreset>();
 
-		IRenderSettingPresetBuilder presetBuilder = new RenderSettingPresetBuilder();
+		private static Dictionary<IRenderSettingPreset, bool> presetCollapsedDict = new Dictionary<IRenderSettingPreset, bool>();
+
+		private IRenderSettingPresetBuilder presetBuilder = new RenderSettingPresetBuilder();
+
+		private const bool isNotCollapsed = true;
 
 		void OnGUI() {
 			if (presets.Count == 0) {
@@ -19,12 +23,34 @@ public class RenderSettingsWindow : EditorWindow {
 			}
 
 			if(GUILayout.Button("Create new preset")) {
-				presets.Add(presetBuilder.Build("Apple"));
+				IRenderSettingPreset preset = presetBuilder.Build("Preset_" + (presets.Count + 1));
+				presets.Add(preset);
+				presetCollapsedDict.Add(preset, isNotCollapsed);
 				Repaint();
 			}
 		}
 
 		private void DrawPreset(IRenderSettingPreset preset) {
-			EditorGUILayout.LabelField(preset.GetName());
+
+			bool foldoutOpen = EditorGUILayout.Foldout(presetCollapsedDict[preset],
+															preset.GetName(),
+															EditorStyles.foldout);
+
+			presetCollapsedDict[preset] = foldoutOpen;
+
+			if (foldoutOpen) {
+				DrawPresetSettings(preset);
+			}
+
+		}
+
+		private void DrawPresetSettings(IRenderSettingPreset preset) {
+			foreach (string child in preset.GetChildren()) {
+				EditorGUILayout.LabelField(child);
+			}
+
+			if (GUILayout.Button("Add Visual Blueprint")) {
+				preset.AddChild("Child_" + preset.GetChildren().Count);
+			}
 		}
 	}