调用此类时，我得到AttributeError：＆＃39; FixedLayout＆＃39;对象没有属性＆＃39; __ fit_to_window＆＃39;。 我试图弄清楚为什么会这样，但我找不到任何有帮助的东西。 我在运行python 2.7的系统上看到了完全相同的代码，这可能是问题吗？我真的不知道还有什么可说的，但如果您有任何疑问，请询问，如果可以，我会回答。
from kivy.uix.scatterlayout import ScatterLayout
from kivy.properties import ObjectProperty
from kivy.core.window import Window
class FixedLayout(ScatterLayout):
screensize = ObjectProperty((1920, 1080))
def __init__(self, **kw):
kw['size'] = (Window.width, Window.height)
kw['size_hint'] = (None, None)
kw['do_scale'] = False
kw['do_translation'] = False
kw['do_rotation'] = False
super(FixedLayout, self).__init__(**kw)
self.__fit_to_window()
Window.bind(system_size=self.__fit_to_window)
self.screensize = ObjectProperty((1920, 1080))
def __fit_to_window(self, *args):
screen_ratio = self.screensize[0]/float(self.screensize[1])
window_ratio = Window.width/float(Window.height)
if screen_ratio > window_ratio:
self.scale = Window.width/float(self.screensize[0])
else:
self.scale = Window.height/float(self.screensize[1])
print('self.scale ', self.scale)
print('screen_ratio, window_ratio', screen_ratio, window_ratio)
print('screensize', self.screensize)
print('window size', Window.width, Window.height)
输出：
[INFO ] [Kivy ] v1.10.0
[INFO ] [Python ] v3.6.4 (v3.6.4:d48eceb, Dec 19 2017, 06:04:45) [MSC v.1900 32 bit (Intel)]
[INFO ] [Factory ] 194 symbols loaded
[INFO ] [Image ] Providers: img_tex, img_dds, img_sdl2, img_pil, img_gif (img_ffpyplayer ignored)
[INFO ] [OSC ] using <thread> for socket
[INFO ] [Window ] Provider: sdl2
[INFO ] [GL ] Using the "OpenGL" graphics system
[INFO ] [GL ] GLEW initialization succeeded
[INFO ] [GL ] Backend used <glew>
[INFO ] [GL ] OpenGL version <b'4.6.0 NVIDIA 388.43'>
[INFO ] [GL ] OpenGL vendor <b'NVIDIA Corporation'>
[INFO ] [GL ] OpenGL renderer <b'GeForce GTX 980 Ti/PCIe/SSE2'>
[INFO ] [GL ] OpenGL parsed version: 4, 6
[INFO ] [GL ] Shading version <b'4.60 NVIDIA'>
[INFO ] [GL ] Texture max size <16384>
[INFO ] [GL ] Texture max units <32>
[INFO ] [Window ] auto add sdl2 input provider
[INFO ] [Window ] virtual keyboard not allowed, single mode, not docked
self.scale 0.4166666666666572
screen_ratio, window_ratio 1.7777777777777777 1.3333333333333333
screensize (1920, 1080)
window size 800 600
[INFO ] [GL ] NPOT texture support is available
self.scale 0.4166666666666572
screen_ratio, window_ratio 1.7777777777777777 1.3333333333333333
screensize (1920, 1080)
window size 800 600
Traceback (most recent call last):
File "c:/Users/DWL/Documents/Python_Projects/Kivy/TestMancala/MancalaTest.py", line 23, in <module>
presentation = Builder.load_file('mancala.kv')
File "C:\Python\lib\site-packages\kivy\lang\builder.py", line 301, in load_file
return self.load_string(data, **kwargs)
File "C:\Python\lib\site-packages\kivy\lang\builder.py", line 382, in load_string
self._apply_rule(widget, parser.root, parser.root)
File "C:\Python\lib\site-packages\kivy\lang\builder.py", line 566, in _apply_rule
self.apply(child)
File "C:\Python\lib\site-packages\kivy\lang\builder.py", line 451, in apply
self._apply_rule(widget, rule, rule, ignored_consts=ignored_consts)
File "C:\Python\lib\site-packages\kivy\lang\builder.py", line 564, in _apply_rule
child = cls(__no_builder=True)
File "c:\Users\DWL\Documents\Python_Projects\Kivy\TestMancala\fixedlayout.py", line 17, in __init__
Window.bind(system_size=self.__fit_to_window)
File "kivy\_event.pyx", line 439, in kivy._event.EventDispatcher.bind (kivy\_event.c:6558)
File "kivy\_event.pyx", line 951, in kivy._event.EventObservers.bind (kivy\_event.c:11000)
File "C:\Python\lib\site-packages\kivy\weakmethod.py", line 47, in __call__
return getattr(self.proxy, self.method_name)
AttributeError: 'FixedLayout' object has no attribute '__fit_to_window'