How to detect when my application is not visible?

Question

How do I detect when my html5 exported game is not visible?
Like:
- when the user changes to another tab
- when the user has minimized the browser
- when the user alt+tab to another app

I already tried to print all events in _notification (what). however it appears that no notification is sent in these cases *sigh*

thanks in advance

Answer 1

All those cases can be handled with MainLoop's NOTIFICATION_WM_FOCUS_OUT.

func _notification(what):
    match what:
        MainLoop.NOTIFICATION_WM_FOCUS_OUT:
           #Pause however you want here
        MainLoop.NOTIFICATION_WM_FOCUS_IN:
           #Unpause

Comments

This works great in the editor, but nothing happens on the HTML5 exported version

my code:

func _notification(what):
    match what:
        MainLoop.NOTIFICATION_WM_FOCUS_OUT:
            if $background.playing:
                print('pausing background')
                $background.stream_paused = true
        MainLoop.NOTIFICATION_WM_FOCUS_IN:
            if play_background and Settings.is_music_on():
                if $background.stream_paused:
                    $background.stream_paused = false
                    print('resuming background')

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Well... this sucks. I discovered that this notification is only emitted on the Release version and not in the Debug version of the HTML5 exported version for some obscure reason, which is a pain to test

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That's not the case either. Something else is interfering with this notification.
Sometimes this works, sometimes don't.