Clamped AnimationCurve GUI - constrains the curve to a range, typically 0-1

ClampedCurveAttribute.cs

using System;
using UnityEngine;

/// <summary>Constrains an AnimationCurve to a specific range. Use the default constructor for the typical 0-1 range. Use Mathf.Infinity to unconstrain specific values.</summary>
[AttributeUsage(AttributeTargets.Field | AttributeTargets.Property, AllowMultiple = false, Inherited = true)]
public class ClampedCurveAttribute : PropertyAttribute
{
    public Rect ranges;
 
    public ClampedCurveAttribute()
    { 
        ranges = new Rect(0, 0, 1, 1);
    }
    
    public ClampedCurveAttribute(float minX, float minY,float maxX, float maxY)
    { 
        ranges = new Rect(minX, minY, maxX - minX, maxY - minY);
    }
}

ClampedCurveDrawer.cs

using UnityEngine;
using UnityEditor;

[CustomPropertyDrawer(typeof(ClampedCurveAttribute))]
public class ClampedCurveDrawer : PropertyDrawer
{
    private const float ClampToggleWidth = 60;
        
    private bool showClamped = true;

    public override void OnGUI(Rect position, SerializedProperty property, GUIContent label)
    {
        ClampedCurveAttribute attr = attribute as ClampedCurveAttribute;
        
        if (property.propertyType == SerializedPropertyType.AnimationCurve)
        {
            var curveRect = new Rect(position.x, position.y, position.width - ClampToggleWidth, position.height);
            var toggleRect = new Rect(curveRect.xMax, position.y, ClampToggleWidth, position.height);
                
            if (showClamped)
            {
                EditorGUI.CurveField(curveRect, property, Color.cyan, attr!.ranges, label);
            }
            else
            {
                EditorGUI.PropertyField(curveRect, property, label);
            }

            EditorGUIUtility.labelWidth = 40;
            showClamped = EditorGUI.Toggle(toggleRect, "Clamp", showClamped);
        }
        else
        {
            Debug.LogError("ClampedCurveAttribute must only be used on AnimationCurve fields.", property.serializedObject.targetObject);
            EditorGUI.PropertyField(position, property, label);
        }
    }
}

UsageExample.cs

// ...

[SerializeField, ClampedCurve(0, 0, 1, 1)]
private AnimationCurve curve = AnimationCurve.Linear(0, 0, 1, 1);

// ...