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