Save/restore size and position of app

[John Anderson]

I have a kivy app that is not fullscreen. I would like to save the geometry (size and position of the app on the device screen) of the app when the user quits, and restore the app to the same size and position when it is next started. I know about the .ini file, but there is no mention in the documentation about size and position. Is this possible in a Kivy app?

     Thanks,

         John

[ZenCODE]

Size is covered here: https://kivy.org/docs/api-kivy.config.html. You could save the size on closing and restore it on startup. 

As for the position, the Window (kivy.core.window.Window) has a position, so you could try saving and restoring that if needs be.

If you don't come right, please try posting a minimal code example that we can help you with...

Thanks

[John Anderson]

I have attached a minimal example. The size part works using Window.size, stumbled across that, but cannot find any actual documentation for it.

Cannot figure out the position part. Trying to use "self.root_window.top" causes an Exception:

File "/home/jra/PycharmProjects/SizeAndLocationPlay/main.py", line 62, in on_stop

     print('top = ' + str(self.root_window.top) + '\n')

   File "kivy/properties.pyx", line 483, in kivy.properties.Property.__get__ (/tmp/pip-build-vf10dxpy/kivy/kivy/properties.c:5670)

   File "kivy/properties.pyx", line 1467, in kivy.properties.AliasProperty.get (/tmp/pip-build-vf10dxpy/kivy/kivy/properties.c:23970)

   File "/usr/local/lib/python3.6/site-packages/kivy/core/window/__init__.py", line 752, in _get_top

     return self._get_window_pos()[1]

 TypeError: 'NoneType' object is not subscriptable

The ini file contains a "top" and "left" in the "graphics" section, but they seem to just be copies from the systemwide kivy Config. Changing those values in the ini file seems to have no effect.

Any suggestions?

[John Anderson]

Finally figured it out. There is a bug in the Ubuntu Kivy.  The attached code does exactly what I want under Windows, but throws exceptions under Ubuntu. When I try to access the 'left' property of the apps 'root_window', I get the following under Ubuntu:

   File "main.py", line 48, in on_stop

     print('setting left and top to ' + str(window.left) + ', ' + str(window.top) + '\n')

   File "kivy/properties.pyx", line 483, in kivy.properties.Property.__get__ (/tmp/pip-build-vf10dxpy/kivy/kivy/properties.c:5670)

   File "kivy/properties.pyx", line 1467, in kivy.properties.AliasProperty.get (/tmp/pip-build-vf10dxpy/kivy/kivy/properties.c:23970)

   File "/usr/local/lib/python3.6/site-packages/kivy/core/window/__init__.py", line 743, in _get_left

     return self._get_window_pos()[0]

 TypeError: 'NoneType' object is not subscriptable

Will report this to Kivy issues.