wails/mkdocs-website/docs/en/API/application_events.md

On

API: On(eventType events.ApplicationEventType, callback func(event *Event)) func()

On() registers an event listener for specific application events. The callback function provided will be triggered when the corresponding event occurs. The function returns a function that can be called to remove the listener.

RegisterHook

API: RegisterHook(eventType events.ApplicationEventType, callback func(event *Event)) func()

RegisterHook() registers a callback to be run as a hook during specific events. These hooks are run before listeners attached with On(). The function returns a function that can be called to remove the hook.