MinMaxRangeDrawer.cs

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using UnityEngine;
using UnityEditor;

namespace HKI.Core.Variables.Editor
{
    [CustomPropertyDrawer(typeof(MinMaxRangeAttribute))]
    public class MinMaxRangeDrawer : PropertyDrawer
    {
        // OnGUI function
        public override void OnGUI(Rect position, SerializedProperty property, GUIContent label)
        {
            // Now draw the property as a Slider or an IntSlider based on whether it’s a float or integer.
            if (property.type != "MinMaxRange")
                Debug.LogWarning("Use only with MinMaxRange type");
            else
            {
                MinMaxRangeAttribute range = attribute as MinMaxRangeAttribute;
                SerializedProperty minValue = property.FindPropertyRelative("RangeStart");
                SerializedProperty maxValue = property.FindPropertyRelative("RangeEnd");
                float newMin = minValue.floatValue;
                float newMax = maxValue.floatValue;
                
                float widthLabel = label == null || string.IsNullOrEmpty(label.text) ? 0.0f : position.width * 0.425f;
                float widthLimit = 30.0f;
                float widthRange = 50.0f;

                EditorGUI.LabelField(new Rect(position.x, position.y, widthLabel, position.height), label);

                EditorGUI.LabelField(new Rect(position.x + widthLabel, position.y, widthLimit, position.height), range.MinLimit.ToString("0.##"));

                newMin = Mathf.Clamp(EditorGUI.FloatField(new Rect(position.x + widthLabel + widthLimit, position.y, widthRange, position.height), newMin), range.MinLimit, newMax);
                
                EditorGUI.MinMaxSlider(new Rect(position.x + widthLabel + widthLimit + widthRange, position.y, position.width - widthLabel - 2 * (widthLimit + widthRange), position.height), ref newMin, ref newMax, range.MinLimit, range.MaxLimit);
                
                newMax = Mathf.Clamp(EditorGUI.FloatField(new Rect(position.x + position.width - widthLimit - widthRange, position.y, widthRange, position.height), newMax), newMin, range.MaxLimit);

                EditorGUI.LabelField(new Rect(position.x + position.width - widthLimit, position.y, widthLimit, position.height), range.MaxLimit.ToString("0.##"));

                minValue.floatValue = newMin;
                maxValue.floatValue = newMax;
            }
        }
    }
}