How to stop app after `Recorder` playback?

[Carsten Fuchs]

Dear Kivy group,

I'm using the Recorder class to record and playback input events. The recording works well, but I cannot figure out how I can stop the app properly when the playback has reached its end: Whatever I do, the log always end with the these lines with errors:

[INFO   ] [Recorder    ] Playing finished.
[INFO   ] [Recorder    ] Stop playing 'tests/test_pause_buttons.events'
[ERROR  ] [Base        ] No event listeners have been created
[ERROR  ] [Base        ] Application will leave
[INFO   ] [WindowSDL   ] exiting mainloop and closing.

This is the code that I use to add playback to my app:

#!/usr/bin/env python3
from kivy.input.recorder import Recorder
from LoST import LoSTApp


class CustomPlayer(Recorder):
    def on_play(self, instance, value):
        super().on_play(instance, value)
        if not value:
            self.window.close()  # Close the window at the end of the playback.
            return


class PlayingLoSTApp(LoSTApp):
    """
    This class adds automatic playback of previously recorded input events to our LoST app.
    """

    def __init__(self, **kwargs):
        self.player = CustomPlayer(filename="tests/test_pause_buttons.events")
        super().__init__(**kwargs)

    def on_start(self):
        super().on_start()
        self.player.play = True

    def on_stop(self):
        super().on_stop()
        self.player.play = False
        print("on_stop()")


if __name__ == '__main__':
    PlayingLoSTApp().run()

But whatever I do (e.g. putting the `self.window.close()` into `CustomPlayer.on_stop()`), there are always the above ERROR lines in the log.

Any ideas how I can gracefully stop the app when the playback has finished?

Best regards,

Carsten

[ZenCODE]

Hmmm. That happens here, in the idle loop..

            https://github.com/kivy/kivy/blob/master/kivy/base.py#L408

It seems as if the stoping has removed the event listeners but the idle loop still expects them to be there,. You can:

1. ignore it

2. investigate further and report the bug if it's valid.

3. investigate further, fix the issue and submit a PR for the fix.

Thanks

[Carsten Fuchs]

Hello,

ok, I guess that I have to go with 1 (ignore problem) and 2 (file issue) at this time:

https://github.com/kivy/kivy/issues/7098

Note that delaying the call to `self.window.close()` triggers the error too, but if ESC is pressed before the delay has elapsed, the app exits cleanly.
The issue contains self-contained example code. I also copy it below for completeness.

Best regards,
Carsten


#!/usr/bin/env python3
import kivy
kivy.require('1.11.1')

from kivy.app import App
from kivy.clock import Clock
from kivy.input.recorder import Recorder
from kivy.uix.togglebutton import ToggleButton

class CustomPlayer(Recorder):
def on_play(self, instance, value):
super().on_play(instance, value)
if not value:

# The direct call triggers the error:
# self.window.close()
# The delayed call triggers the error, too. If however ESC is
# pressed before the delay has elapsed, the error does not occur.
Clock.schedule_once(lambda dt: self.window.close(), 3.0)


class MyApp(App):
"""An app with automatic playback of previously recorded input events."""

def __init__(self, **kwargs):
super().__init__(**kwargs)
self.player = CustomPlayer(filename="/tmp/test.events")

def build(self):
return ToggleButton(text='Hello')

def on_start(self):
super().on_start()
self.player.play = True

def on_stop(self):
super().on_stop()
self.player.play = False
print("on_stop()")


if __name__ == '__main__':

with open('/tmp/test.events', 'w') as f:
f.write("#RECORDER1.0\n")
f.write("(1.0, 'begin', 1, {'is_touch': True, 'sx': 0.22875, 'sy': 0.12, 'profile': ['pos']})\n")
f.write("(1.0, 'end', 1, {'is_touch': True, 'sx': 0.22875, 'sy': 0.12, 'profile': ['pos']})\n")

MyApp().run()


Am 19.09.20 um 14:19 schrieb ZenCODE:

> Hmmm. That happens here, in the idle loop..
>
>             https://github.com/kivy/kivy/blob/master/kivy/base.py#L408
>
> It seems as if the stoping has removed the event listeners but the idle loop still expects them to be there,. You can:
>
> 1. ignore it
> 2. investigate further and report the bug if it's valid.
> 3. investigate further, fix the issue and submit a PR for the fix.
>
> Thanks
>
> On Friday, September 18, 2020 at 2:18:22 PM UTC+2 carste...@cafu.de wrote:
>
> Dear Kivy group,
>

> I'm using the Recorder <https://kivy.org/doc/stable/api-kivy.input.recorder.html> class to record and playback input events. The recording works well, but I cannot figure out how I can stop the app properly when the playback has reached its end: Whatever I do, the log always end with the these lines with errors:

>
> |
> [INFO   ][Recorder   ]Playingfinished.
> [INFO   ][Recorder   ]Stopplaying 'tests/test_pause_buttons.events'

> [ERROR  ][Base       ]Noeventlisteners have been created
> [ERROR  ][Base       ]Applicationwill leave

> [INFO   ][WindowSDL  ]exiting mainloop andclosing.
> |
>
> This is the code that I use to add playback to my app:
>
> |
> #!/usr/bin/env python3
> fromkivy.input.recorder importRecorder
> fromLoSTimportLoSTApp
>
>
> classCustomPlayer(Recorder):
>     defon_play(self,instance,value):
>         super().on_play(instance,value)
>         ifnotvalue:
>             self.window.close() # Close the window at the end of the playback.
>             return
>
>
> classPlayingLoSTApp(LoSTApp):
>     """
>     This class adds automatic playback of previously recorded input events to our LoST app.
>     """
>
>     def__init__(self,**kwargs):
>         self.player =CustomPlayer(filename="tests/test_pause_buttons.events")
>         super().__init__(**kwargs)
>
>     defon_start(self):
>         super().on_start()
>         self.player.play =True
>
>     defon_stop(self):
>         super().on_stop()
>         self.player.play =False
>         print("on_stop()")
>
>

> if__name__ =='__main__':

>     PlayingLoSTApp().run()
> |
>
> But whatever I do (e.g. putting the `self.window.close()` into `CustomPlayer.on_stop()`), there are always the above ERROR lines in the log.
>
> Any ideas how I can gracefully stop the app when the playback has finished?
>
> Best regards,
> Carsten
>
>

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--
Dipl.-Inf. Carsten Fuchs
Industriegebiet 3 ℅ Rofu
55768 Hoppstädten-Weiersbach
https://www.cafu.de