How to monitor the movement of the window? I hope to receive event alerts when the window is moved

[木瓜太香]

I'm writing a code to highlight the current focused window. I will draw some lines on the edge of the window to serve as a reminder, but I don't know how to monitor the window's movement event. What should I do?

[M N]

here is my solution:

Draw a red border around the current active app.
https://github.com/muescha/dot_hammerspoon/blob/master/Functions/AppBorders.lua

[木瓜太香]

Thank you for your help. I have already implemented similar code myself. What I want to resolve is the issue where the window does not follow the border during movement. This problem still persists.