Add option to set fixed sizes for horizontal group columns

Author: vanifatovvlad

Editor.Extras/GroupDrawers/TriHorizontalGroupDrawer.cs

@@ -11,7 +11,7 @@ public class TriHorizontalGroupDrawer : TriGroupDrawer<DeclareHorizontalGroupAtt
     {
         public override TriPropertyCollectionBaseElement CreateElement(DeclareHorizontalGroupAttribute attribute)
         {
-            return new TriHorizontalGroupElement();
+            return new TriHorizontalGroupElement(attribute.Sizes);
         }
     }
 }

Editor/Elements/TriHorizontalGroupElement.cs

@@ -1,26 +1,46 @@
-using TriInspector.Utilities;
+using System;
+using TriInspector.Utilities;
 using UnityEditor;
 using UnityEngine;
 
 namespace TriInspector.Elements
 {
     public class TriHorizontalGroupElement : TriPropertyCollectionBaseElement
     {
+        private readonly float[] _sizes;
+        private readonly float _totalFixedSize;
+
+        public TriHorizontalGroupElement(float[] sizes = null)
+        {
+            _sizes = sizes ?? Array.Empty<float>();
+            _totalFixedSize = 0f;
+
+            for (var index = 0; index < _sizes.Length; index++)
+            {
+                if (TryGetFixedSizeByIndex(index, out var fixedSize))
+                {
+                    _totalFixedSize += fixedSize;
+                }
+            }
+        }
+
         public override float GetHeight(float width)
         {
             if (ChildrenCount == 0)
             {
                 return 0f;
             }
 
-            var height = 0f;
-
             var spacing = EditorGUIUtility.standardVerticalSpacing;
-            var totalWidth = width - spacing * (ChildrenCount - 1);
-            var childWidth = totalWidth / ChildrenCount;
+            var totalSpacing = spacing * (ChildrenCount - 1);
+            var totalDynamic = width - totalSpacing - _totalFixedSize;
+            var dynamicChildCount = GetDynamicChildCount();
+
+            var height = 0f;
 
             for (var i = 0; i < ChildrenCount; i++)
             {
+                var childWidth = GetChildWidth(i, totalDynamic, dynamicChildCount);
                 var child = GetChild(i);
                 var childHeight = child.GetHeight(childWidth);
 
@@ -38,24 +58,68 @@ public override void OnGUI(Rect position)
             }
 
             var spacing = EditorGUIUtility.standardVerticalSpacing;
-            var totalWidth = position.width - spacing * (ChildrenCount - 1);
-            var childWidth = totalWidth / ChildrenCount;
+            var totalSpacing = spacing * (ChildrenCount - 1);
+            var totalDynamic = position.width - totalSpacing - _totalFixedSize;
+            var dynamicChildCount = GetDynamicChildCount();
 
+            var xOffset = 0f;
             for (var i = 0; i < ChildrenCount; i++)
             {
+                var childWidth = GetChildWidth(i, totalDynamic, dynamicChildCount);
                 var child = GetChild(i);
                 var childRect = new Rect(position)
                 {
                     width = childWidth,
                     height = child.GetHeight(childWidth),
-                    x = position.x + i * (childWidth + spacing),
+                    x = position.xMin + xOffset,
                 };
 
                 using (TriGuiHelper.PushLabelWidth(EditorGUIUtility.labelWidth / ChildrenCount))
                 {
                     child.OnGUI(childRect);
                 }
+
+                xOffset += childWidth + spacing;
             }
         }
+
+        private float GetDynamicChildCount()
+        {
+            var count = 0f;
+
+            for (var i = 0; i < ChildrenCount; i++)
+            {
+                if (TryGetFixedSizeByIndex(i, out _))
+                {
+                    continue;
+                }
+
+                count++;
+            }
+
+            return count;
+        }
+
+        private float GetChildWidth(int i, float totalDynamic, float dynamicChildCount)
+        {
+            if (TryGetFixedSizeByIndex(i, out var fixedSize))
+            {
+                return fixedSize;
+            }
+
+            return totalDynamic / dynamicChildCount;
+        }
+
+        private bool TryGetFixedSizeByIndex(int index, out float fixedSize)
+        {
+            if (index < _sizes.Length && _sizes[index] > 0f)
+            {
+                fixedSize = _sizes[index];
+                return true;
+            }
+
+            fixedSize = 0f;
+            return false;
+        }
     }
 }

Runtime/Attributes/DeclareHorizontalGroupAttribute.cs

@@ -10,5 +10,7 @@ public class DeclareHorizontalGroupAttribute : DeclareGroupBaseAttribute
         public DeclareHorizontalGroupAttribute(string path) : base(path)
         {
         }
+
+        public float[] Sizes { get; set; }
     }
 }