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 Android, the back button is used to quit when on the main screen (and
to go back otherwise).

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.

On Android, ``NOTIFICATION_WM_GO_BACK_REQUEST`` is sent instead.
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).

.. note::

    ``NOTIFICATION_WM_GO_BACK_REQUEST`` isn't supported on iOS, as
    iOS devices don't have a physical Back button.

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
    }

When developing mobile apps, quitting is not desired unless the user is
on the main screen, so the behavior can be changed.

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;

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.