Add High DPI support

Try to find a way to support High DPI awareness out-of-the-box. The easiest way might be some kind of parameter added to the Tk widget that enables certain OS specific settings and possibly calculates the appropriate scaling by default while allowing for overides.

Without High DPI Awareness

The application is running on Windows 11 without high DPI awareness

• images and fonts are noticeably pixelated on a 4k screen, not quite so noticeable on 2k
• relative scaling of widgets appears ok

High DPI Awareness Enabled (No Tk Scaling)

The exhibit below illustrates the application on Windows 11 with DPI awareness turned on

• image-based layouts are too small as they are not scaled appropriately
• fonts are not consistently scaled, too big in some cases, too small in others

from ctypes import windll
windll.shcore.SetProcessDpiAwareness(1)

High DPI Awareness Enabled (Tk Scaling = 1.5)

The exhibit below illustrates the application on Windows 11 with DPI awareness turned on and additional scaling settings configured using tkinter.

• the widgets and fonts all appear crisp and scaled correctly
• the application window size is noticeably smaller
• the titlebar looks a bit too big relative to the window size

from ctypes import windll
windll.shcore.SetProcessDpiAwareness(1)

# after creating root
root.tk.call('tk', 'scaling', 1.5)

[daniilS]

Leaving a comment here to remind myself to respond properly in a few days - I’ve done a lot of playing around with tk scaling on Windows so will need to remember what exactly I’d found.

To scale the titlebar appropriately, I think one of the options of SetThreadDipAwareness (rather than Process) did the trick. However, I found that almost all of the options had some issues with them when a window is created on one monitor, and then dragged to another monitor with a different DPI (the joys of using a laptop + an external monitor). I ended up settling for DPI_AWARENESS_CONTEXT_UNAWARE_GDISCALED as a compromise myself.

[israel-dryer]

while documenting the library, I realized I needed to flatten the modules, and that let me to refactoring several items. The only thing that really changes from an api perspective was the utility module, which is now in the root.

So, this method is now in ttkbootrap.utility.enable_high_dpi_awareness