How to move the cursor to the center of an NSView? - swift

Question

On macOS, I have an application that should move the cursor to the center of the NSView when the window is loaded.
class ViewController: NSViewController {
override func viewDidLayout() {
super.viewDidLayout()
let view = super.view
let point = NSPoint(x: view.frame.midX, y:view.frame.midY)
let pointInWindow = view.convert(point, to: nil)
let pointOnScreen = view.window?.convertToScreen(NSRect(origin: pointInWindow, size: .zero)).origin ?? .zero
CGWarpMouseCursorPosition(NSPoint(x:pointOnScreen.x, y:pointOnScreen.y))
}
}
(The code was taken from: Mac OS X: Convert between NSView coordinates and global screen coordinates)
But it seems to be placing the cursor above the window instead of inside it— x-position looks correct but the y-position is off. Thank you for any help.

Answer 1

I found a usage example on GitHub by searching for CGWarpMousePosition:
https://github.com/chockenberry/Notchmeister/blob/9e9308f0803a4e0faf27790c02081689545a989d/Notchmeister/Notchmeister/PortalEffect.swift#L162-L171
This ended up working. The y-position needed to be subtracted from the bottom screen coordinate:
class ViewController: NSViewController {
override func viewDidLayout() {
super.viewDidLayout()
let view = super.view
let window = view.window
let screen = window!.screen
let viewPoint = NSPoint(x: view.frame.midX, y:view.frame.midY)
let windowPoint = view.convert(viewPoint, to: nil)
let screenPoint = window!.convertPoint(toScreen: windowPoint)
let globalPoint = CGPoint(
x: screen!.frame.origin.x + screenPoint.x,
y: screen!.frame.origin.y + screen!.frame.height - screenPoint.y
)
CGWarpMouseCursorPosition(globalPoint)
}
}