I'm trying to import from kivy.core.window import Window in order to enable texture support to display an image from a numpy array (see https://groups.google.com/forum/#!topic/kivy-users/2Hvarxhz6lU).
However, when I run the import, Kivy attempts to open another window which is blank and unresponsive. When I remove the import statement, the app launches as normal.
Can anyone point me in the right direction to import Window to allow Texture support without this behaviour?
Thanks,
Oliver.
That is highly expected because Kivy is built on this importing behavior. On a simple Window import e.g. in a console:
>>> from kivy.core.window import Window
a blank OpenGL window is created and it waits for further instructions such as first drawing and other initialization stuff.
Let's look at the code from the mailing list:
class MainConsole():
def build(self):
texture = Texture.create() # no window, boom
if __name__ == '__main__':
MainApp().run() # except other stuff also creates a window
To make this actually work you will have to create the texture after the Window is created i.e. this:
class MainConsole():
def build(self):
from kivy.core.window import Window
texture = Texture.create() # window, no boom
The struggle might happen if you try to do that in a Thread(not sure) or with multiprocessing(most likely) if you try to do something like:
def blob():
from kivy.core.window import Window
texture = Texture.create()
if you run this function in a separate process, the separate process won't have the same Window, therefore it creates a new one with the Window import and here you are.
To fix it you can do two things:
Config and move the Window somewhere out of the viewing area with top and leftWindow