Second commit

Assets/Tremble/Editor/EditorUI/Utils/EditorGUILayoutUtil.cs

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+//
+// This file is part of the Tremble package by Tiny Goose.
+// Copyright (c) 2024-2026 TinyGoose Ltd., All Rights Reserved.
+//
+
+using System;
+using UnityEngine;
+using System.Collections.Generic;
+using UnityEditor;
+
+namespace TinyGoose.Tremble.Editor
+{
+	internal static class EditorGUILayoutUtil
+	{
+		internal static void Pad(float pad, Action content) => Pad(pad, pad, content);
+		internal static void Pad(float hPad, float vPad, Action content)
+		{
+			GUILayout.BeginHorizontal();
+			{
+				GUILayout.Space(hPad);
+				GUILayout.BeginVertical();
+				{
+					GUILayout.Space(vPad);
+
+					try
+					{
+						content();
+					}
+					catch (ExitGUIException)
+					{
+						// ignore
+					}
+					catch (Exception ex)
+					{
+						Debug.LogException(ex);
+					}
+
+					GUILayout.Space(vPad);
+				}
+				GUILayout.EndVertical();
+				GUILayout.Space(hPad);
+			}
+			GUILayout.EndHorizontal();
+		}
+
+		private static readonly Dictionary<string, bool> s_CollapsibleHeaderStates = new();
+
+		internal static void Indent(Action inside)
+		{
+			EditorGUI.indentLevel++;
+			inside();
+			EditorGUI.indentLevel--;
+		}
+
+
+		internal static bool FoldoutArrow(bool isOpen)
+		{
+			bool toggle = GUILayout.Button(GUIContent.none, EditorStyles.label, GUILayout.Width(20f));
+
+			Rect buttonRect = GUILayoutUtility.GetLastRect();
+			buttonRect.x += 5f;
+
+			if (Event.current.type == EventType.Repaint)
+			{
+				EditorStyles.foldout.Draw(buttonRect, false, false, isOpen, false);
+			}
+
+			return toggle;
+		}
+
+		internal static bool CollapsibleHeader(string header, bool isOpen, Action inside)
+		{
+			GUILayout.BeginHorizontal();
+			{
+				bool toggle = FoldoutArrow(isOpen);
+				toggle |= GUILayout.Button(header, EditorStyles.label);
+
+				if (toggle)
+				{
+					isOpen = !isOpen;
+				}
+			}
+			GUILayout.EndHorizontal();
+
+			if (isOpen)
+			{
+				GUILayout.BeginHorizontal();
+				{
+					GUILayout.Space(20f);
+					GUILayout.BeginVertical();
+					{
+						inside();
+					}
+					GUILayout.EndVertical();
+				}
+				GUILayout.EndHorizontal();
+			}
+
+			return isOpen;
+		}
+
+		internal static void CollapsibleHeader(string header, string id, bool defaultOpen, Action inside)
+		{
+			bool wasOpen = s_CollapsibleHeaderStates.GetValueOrDefault(id, defaultOpen);
+			s_CollapsibleHeaderStates[id] = CollapsibleHeader(header, wasOpen, inside);
+		}
+
+		internal static void CollapsibleHeader(string header, string id, Action inside)
+			=> CollapsibleHeader(header, id, defaultOpen: false, inside);
+
+		internal static void SetHeaderOpen(string id, bool isOpened)
+		{
+			s_CollapsibleHeaderStates[id] = isOpened;
+		}
+		internal static bool IsHeaderOpen(string id) => s_CollapsibleHeaderStates.GetValueOrDefault(id, false);
+	}
+}