https://docs.unity3d.com/6000.3/Documentation/ScriptReference/UIElements.CallbackEventHandler.RegisterCallback.html
Unity - Scripting API: UIElements.CallbackEventHandler.RegisterCallback
scripting apiunity
https://docs.unity3d.com/6000.3/Documentation/ScriptReference/UIElements.CallbackEventHandler.HandleEventTrickleDown.html
Unity - Scripting API: UIElements.CallbackEventHandler.HandleEventTrickleDown
scripting apiunity
https://docs.unity3d.com/6000.3/Documentation/ScriptReference/UIElements.CallbackEventHandler.HandleEventBubbleUp.html
Unity - Scripting API: UIElements.CallbackEventHandler.HandleEventBubbleUp
scripting apiunity
https://docs.unity3d.com/6000.3/Documentation/ScriptReference/UIElements.CallbackEventHandler.RegisterCallbackOnce.html
Unity - Scripting API: UIElements.CallbackEventHandler.RegisterCallbackOnce
scripting apiunity
https://docs.unity3d.com/6000.3/Documentation/ScriptReference/UIElements.CallbackEventHandler.UnregisterCallback.html
Unity - Scripting API: UIElements.CallbackEventHandler.UnregisterCallback
scripting apiunity