FloatingPointWidthHeightDrawer.cs

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using UnityEngine;
using UnityEditor;

namespace HKI.Core.Variables.Editor
{
    [CustomPropertyDrawer(typeof(FloatingPointWidthHeight))]
    public class FloatWidthHeightDrawer : PropertyDrawer
    {
        // Private variables
        const string widthSPName = "Width";
        const string heightSPName = "Height";

        const float labelWidth = 120.0f;
        const float widthLabelWidth = 40.0f;
        const float heightLabelWidth = 45.0f;

        // OnGUI function
        public override void OnGUI(Rect position, SerializedProperty property, GUIContent label)
        {
            SerializedProperty widthSP = property.FindPropertyRelative(widthSPName);
            SerializedProperty heightSP = property.FindPropertyRelative(heightSPName);

            float inputFieldWidth = (position.width - labelWidth - widthLabelWidth - heightLabelWidth) / 2.0f;

            position.width = labelWidth;
            EditorGUI.LabelField(position, label);

            position.x += labelWidth;
            position.width = widthLabelWidth;
            EditorGUI.LabelField(position, widthSPName);

            position.x += widthLabelWidth;
            position.width = inputFieldWidth;
            EditorGUI.PropertyField(position, widthSP, GUIContent.none);

            position.x += inputFieldWidth;
            position.width = heightLabelWidth;
            EditorGUI.LabelField(position, heightSPName);
            
            position.x += heightLabelWidth;
            position.width = inputFieldWidth;
            EditorGUI.PropertyField(position, heightSP, GUIContent.none);
        }
    }
}