Products Google for Education Blockly Reference Blockly Framework Reference LayoutDelegate public protocol LayoutDelegate: class Protocol for events that occur on a Layout. layoutDidChange(_:withFlags:animated:) Event that is called when a layout has changed. Declaration Swift func layoutDidChange(_ layout: Layout, withFlags flags: LayoutFlag, animated: Bool) Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see our Site Policies. Java is a registered trademark of Oracle and/or its affiliates. Last updated December 1, 2017.