godot-docs/tutorials/inputs/handling_quit_requests.rst

.. _doc_handling_quit_requests:

Handling quit requests
======================

Quitting
--------

Most platforms have the option to request the application to quit. On
desktops, this is usually done with the "x" icon on the window title bar.
On mobile devices, the app can quit at any time while it is suspended
to the background.

Handling the notification
-------------------------

On desktop and web platforms, :ref:`Node <class_Node>` receives a special
``NOTIFICATION_WM_CLOSE_REQUEST`` notification when quitting is requested from
the window manager.

Handling the notification is done as follows (on any node):

.. tabs::
 .. code-tab:: gdscript GDScript

    func _notification(what):
        if what == NOTIFICATION_WM_CLOSE_REQUEST:
            get_tree().quit() # default behavior

 .. code-tab:: csharp

    public override void _Notification(int what)
    {
        if (what == NotificationWMCloseRequest)
            GetTree().Quit(); // default behavior
    }

It is important to note that by default, Godot apps have the built-in
behavior to quit when quit is requested from the window manager. This
can be changed, so that the user can take care of the complete quitting
procedure:

.. tabs::
 .. code-tab:: gdscript GDScript

    get_tree().set_auto_accept_quit(false)

 .. code-tab:: csharp

    GetTree().AutoAcceptQuit = false;

On mobile devices
-----------------

There is no direct equivalent to ``NOTIFICATION_WM_CLOSE_REQUEST`` on mobile 
platforms. Due to the nature of mobile operating systems, the only place 
that you can run code prior to quitting is when the app is being suspended to 
the background. On both Android and iOS, the app can be killed while suspended 
at any time by either the user or the OS. A way to plan ahead for this 
possibility is to utilize ``NOTIFICATION_APPLICATION_PAUSED`` in order to 
perform any needed actions as the app is being suspended.

On Android, pressing the Back button will exit the application if 
**Application > Config > Quit** On Go Back is checked in the Project Settings 
(which is the default). This will fire ``NOTIFICATION_WM_GO_BACK_REQUEST``.


Sending your own quit notification
----------------------------------

While forcing the application to close can be done by calling
:ref:`SceneTree.quit <class_SceneTree_method_quit>`, doing so will not send
the ``NOTIFICATION_WM_CLOSE_REQUEST`` to the nodes in the scene tree.
Quitting by calling :ref:`SceneTree.quit <class_SceneTree_method_quit>` will
not allow custom actions to complete (such as saving, confirming the quit,
or debugging), even if you try to delay the line that forces the quit.

Instead, if you want to notify the nodes in the scene tree about the upcoming
program termination, you should send the notification yourself:

.. tabs::
 .. code-tab:: gdscript GDScript

    get_tree().root.propagate_notification(NOTIFICATION_WM_CLOSE_REQUEST)

 .. code-tab:: csharp

    GetTree().Root.PropagateNotification((int)NotificationWMCloseRequest);

Sending this notification will inform all nodes about the program termination,
but will not terminate the program itself *unlike in 3.X*. In order to achieve
the previous behavior, :ref:`SceneTree.quit <class_SceneTree_method_quit>` should
be called after the notification.