Unity scraps

UnityScraps.cs

// show the field as a read only label (runtime script)
[AttributeUsage(AttributeTargets.Field)]
public class ReadOnlyAttribute : PropertyAttribute { }

// read only drawer (editor script)
[CustomPropertyDrawer(typeof (ReadOnlyAttribute))]
public class ReadOnlyAttributeDrawer : PropertyDrawer
{
    private static readonly GUIStyle Style = EditorStyles.label;

    public override void OnGUI(Rect position, SerializedProperty property, GUIContent label)
    {
        switch (property.propertyType)
        {
            case SerializedPropertyType.Integer:
                EditorGUI.IntField(position, label, property.intValue, Style);
                break;
            case SerializedPropertyType.Float:
                EditorGUI.FloatField(position, label, property.floatValue, Style);
                break;
            case SerializedPropertyType.String:
                EditorGUI.TextField(position, label, property.stringValue, Style);
                break;
            default:
                EditorGUI.LabelField(position, "The property type is not valid " + property.propertyType + " for ReadOnlyAttribute to work!");
                break;
        }
    }
}



// render layer dropdown (runtime script)
[AttributeUsage(AttributeTargets.Field)]
public class LayerAttribute : PropertyAttribute { }

// layer drawer (editor script)
[CustomPropertyDrawer(typeof (LayerAttribute))]
public class LayerAttributeDrawer : PropertyDrawer
{
    private const SerializedPropertyType ValidPropertyType = SerializedPropertyType.Integer;

    public override void OnGUI(Rect position, SerializedProperty property, GUIContent label)
    {
        if (property.propertyType != ValidPropertyType)
        {
            EditorGUI.LabelField(position, "The property has to be a " + ValidPropertyType + " for LayerAttribute to work!");
            return;
        }
        property.intValue = EditorGUI.LayerField(position, label, property.intValue);
    }
}



public class Example : MonoBehaviour
{
    [Range(1f, 10f)]
    public float CamreaScale = 2f;

    [Layer]
    public int RenderLayer = 10; // see project settings, tags & layers

    [ReadOnly]
    public float TraceDistance; // the value is still saved by unity so not optimal
}