Use system colors as defaults (dark mode fix)

[spyoungtech]

By default, Gooey chooses the default color scheme for apps.

In dark mode, this can make apps a bit difficult to use, particularly on MacOS. For example, when dark mode is in use, I notice the header text is not visible, fields are difficult to see, and the button text is not readable:

I would suggest that, by default, Gooey should use the system colors, which will account for dark mode and other user-configured OS options. I.E. using wx.SystemSettings.GetColour. This way, applications use color schemes according to user system preferences.

[spyoungtech]

Using system colors, dark mode might look something like this:

(or colors might inverse)

[enorms]

I noticed that too! From the Widget Example on Mac:

In Light Mode

In Dark Mode

On Mac, the state can be determined by a subprocess output:

>>> # in dark mode
>>> wx.SystemSettings.GetAppearance().IsDark()
False
>>> import subprocess
>>> subprocess.Popen(cmd, stdout=subprocess.PIPE,stderr=subprocess.PIPE, shell=True).communicate()
(b'Dark\n', b'')
>>> # in light mode
>>> wx.SystemSettings.GetAppearance().IsDark()
False
>>> subprocess.Popen(cmd, stdout=subprocess.PIPE,stderr=subprocess.PIPE, shell=True).communicate()
(b'', b'2021-06-16 21:25:45.850 defaults[40272:12750955] \nThe domain/default pair of (kCFPreferencesAnyApplication, AppleInterfaceStyle) does not exist\n')

[ustun]

@enxyz

wx.SystemSettings.GetAppearance().IsDark()

seems buggy, but

wx.SystemSettings.GetAppearance().IsUsingDarkBackground()

seems to work fine for me on MacOS 12.3.1.

The docs seem to suggest otherwise though: https://wxpython.org/Phoenix/docs/html/wx.SystemAppearance.html