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## com.google.gwt.user.client
Interface Window.ClosingHandler

All Superinterfaces:
  EventHandler

All Known Implementing Classes:
  BaseListenerWrapper.WrapWindowClose

Enclosing class:
  Window

    public static interface Window.ClosingHandler

extends EventHandler

Handler for `Window.ClosingEvent` events.

Method Summary
`void` | `onWindowClosing(Window.ClosingEvent event)` Fired just before the browser window closes or navigates to a different site.

Method Detail

### onWindowClosing

    void onWindowClosing(Window.ClosingEvent event)

  Fired just before the browser window closes or navigates to a different site. No user-interface may be displayed during shutdown.

  Parameters:
    `event` - the event

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