From fc7628e2ee22975f8e524f315efba6cf728454d3 Mon Sep 17 00:00:00 2001
From: Chandler Cox <mr.chandlercox@gmail.com>
Date: Fri, 10 May 2024 19:22:23 -0500
Subject: [PATCH] Add tree node guidlines

---
 Source/Editor/GUI/Tree/TreeNode.cs        | 32 +++++++++++++++++++++++
 Source/Editor/Options/InterfaceOptions.cs |  7 +++++
 2 files changed, 39 insertions(+)

diff --git a/Source/Editor/GUI/Tree/TreeNode.cs b/Source/Editor/GUI/Tree/TreeNode.cs
index f4ff33e8d3..7b94f7f302 100644
--- a/Source/Editor/GUI/Tree/TreeNode.cs
+++ b/Source/Editor/GUI/Tree/TreeNode.cs
@@ -698,6 +698,38 @@ public override void Draw()
                 }
             }
 
+            // Show tree guide lines
+            if (Editor.Instance.Options.Options.Interface.ShowTreeLines)
+            {
+                TreeNode parentNode = Parent as TreeNode;
+                bool thisNodeIsLast = false;
+                while (parentNode != null && parentNode != ParentTree.Children[0])
+                {
+                    float bottomOffset = 0;
+                    float topOffset = 0;
+
+                    if (Parent == parentNode && this == Parent.Children[0])
+                        topOffset = 2;
+
+                    if (thisNodeIsLast && parentNode.Children.Count == 1)
+                        bottomOffset = topOffset != 0 ? 4 : 2;
+
+                    if (Parent == parentNode && this == Parent.Children[Parent.Children.Count - 1] && !_opened)
+                    {
+                        thisNodeIsLast = true;
+                        bottomOffset = topOffset != 0 ? 4 : 2;
+                    }
+
+                    float leftOffset = 9;
+                    // Adjust offset for icon image
+                    if (_iconCollaped.IsValid)
+                        leftOffset += 18;
+                    var lineRect1 = new Rectangle(parentNode.TextRect.Left - leftOffset, parentNode.HeaderRect.Top + topOffset, 1, parentNode.HeaderRect.Height - bottomOffset);
+                    Render2D.FillRectangle(lineRect1, isSelected ? style.ForegroundGrey : style.LightBackground);
+                    parentNode = parentNode.Parent as TreeNode;
+                }
+            }
+
             // Base
             if (_opened)
             {
diff --git a/Source/Editor/Options/InterfaceOptions.cs b/Source/Editor/Options/InterfaceOptions.cs
index 4cf1fe0506..2234201913 100644
--- a/Source/Editor/Options/InterfaceOptions.cs
+++ b/Source/Editor/Options/InterfaceOptions.cs
@@ -210,6 +210,13 @@ public enum ValueFormattingType
         [EditorDisplay("Interface"), EditorOrder(310)]
         public bool SeparateValueAndUnit { get; set; }
 
+        /// <summary>
+        /// Gets or sets the option to put a space between numbers and units for unit formatting.
+        /// </summary>
+        [DefaultValue(true)]
+        [EditorDisplay("Interface"), EditorOrder(320)]
+        public bool ShowTreeLines { get; set; } = true;
+
         /// <summary>
         /// Gets or sets the timestamps prefix mode for output log messages.
         /// </summary>