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

    All Methods Instance Methods Abstract Methods
    Modifier and Type | Method and Description
    --- | ---
    `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