✨ Option to use macOS center instead of screen center

[Zabriskije]

Feature Request Description

Press return to center a window uses the actual screen center, but I found more ergonomic to have windows in the default macOS center by using func center(). I'd like to propose it as an alternative, making the user select the preferred one.

Screenshots

macOS center:

Screen center:

Additional Context

No response

Final Checks

• My issue title is descriptive
• This is a single feature request (multiple feature requests should be reported individually)

[MrKai77]

Definitely interested in implementing this! Unfortunately, Loop doesn't have access to any other app's window's NSWindow, which means that we can't call NSWindow.center() on a target window. This is why Loop uses the window's AXUIElement to resize the window.
I can't seem to find any resources which explain how MacOS calculates a window's "center" position on the screen, but do you have any insight on this? I'm guessing that MacOS does it by moving the window a certain percentage up the screen and calling that the center position?

[Zabriskije]

Unfortunately, I can't help with that :(
I came up with func center() by a quick Google search. I don't know Swift, so the best I can do is guess.
Center window in screen – Stack Overflow, would this be helpful? I only found examples with NSWindowController but none with AXUIElement.

[MrKai77]

Unfortunately not :(
But thanks for your effort!

macOS center:

Out of curiosity, how were you able to "MacOS center" the Safari window in the screenshot? Is there a built-in command to center a window? Or was it a different window manager?
This might hint a way to calculate the MacOS's center position for a window.

[Zabriskije]

Out of curiosity, how were you able to "MacOS center" the Safari window in the screenshot? Is there a built-in command to center a window? Or was it a different window manager? This might hint a way to calculate the MacOS's center position for a window.

Still Moom

[MrKai77]

Alright, I found the formula to center a window on a screen (I spent way too much time on this 😂), and it places windows in the equivalent position of NSWindow.center()!

let halfScreenHeight = screenFrame.height / 2
let windowHeightPercent = windowFrame.height / screenFrame.height
let yOffset: CGFloat = (0.5 * windowHeightPercent - 0.5) * halfScreenHeight

newWindowFrame = CGRect(
        x: screenFrame.midX - windowFrame.width / 2,
        y: screenFrame.midY - windowFrame.height / 2 + yOffset,
        width: windowFrame.width,
        height: windowFrame.height
)

Now I guess all that's left is to actually put it in Loop!

[MrKai77]

Alright, sorry for the wait!
Here's a working build: Loop.zip
Happy new year!

[Zabriskije]

Happy New Year too!
Seems working 🚀