Check and Radio Buttons

Pyscripter unscaled alt theme	Spyder unscaled alt theme

Within an application these buttons are normally grouped together and superficially they should not cause any real problem. It is not until sizes have to be changed that we run into problems - the alt theme has no simple size adjustment.

At the end of this section a standalone module is created to make check and radiobuttons scaleable.

Finding the Factor for Scaling

Within the section on Monitor Resolution DPI a simplified method was used:

from ctypes import windll

# with Windows set the script to be dpi aware before calling Tk()
windll.shcore.SetProcessDpiAwareness(1)
.......
root = Tk()

# shcore gives the scaling factor directly
scaleFactor = windll.shcore.GetScaleFactorForDevice(0) / 100
root.tk.call('tk', 'scaling', scaleFactor)

An alternative method, valid for Linux and Windows was also shown:

from ctypes import windll

# with Windows set the script to be dpi aware before calling Tk()
windll.shcore.SetProcessDpiAwareness(1)
.......
root = Tk()

ORIGINAL_DPI = 96
current_dpi = root.winfo_fpixels('1i') # valid for Linux, Windows
SCALE = current_dpi / ORIGINAL_DPI

# when current_dpi is 192 SCALE becomes 2.0
root.tk.call('tk', 'scaling', SCALE)

Within this section a third variant is used, which includes Mac users:

............
root = Tk()
winsys = root.tk.call("tk", "windowingsystem")
BASELINE = 1.33398982438864281 if winsys != 'aqua' else 1.000492368291482
scaling = root.tk.call("tk", "scaling")
dpi_scaling = int(scaling / BASELINE + 0.5)

This last variant scales the widgets only if they have been created with a scaling factor, whereas the first two variants change the widgets through tk/tcl so can only affect the standard ttk widgets. Third party widgets are mostly image based so cannot be altered by any of these means, or else are already scaleable, sphinx-bootstrap widgets.

Check- Radiobuttons...

• Checkbutton Introduction
• Scaleable Checkbuttons
• Scaleable Radiobuttons