How to prevent a NSCursor from change?

问题

I have a problem while I try to prevent a cursor from changing. I try to put an overlay View over entire window, but, if under that overlay exist an NSTextView, this will force cursor to change. I want to prevent that, and keep the arrow cursor until my overlay view will be removed.

Overriding the cursorUpdate method does not work...

override func cursorUpdate(with event: NSEvent) {
    return

}

Thanks!

Even this (question 32447739) answer does not help. This solution is valid only if the overlay view is smaller than TextView.

回答1:

If the NSTextView is yours, you can get the behaviour you want by subclassing and overriding mouseMoved: there. There are several examples available, if you search.

If subclassing the text view is not an option, the best thing would be to use an NSWindow for your overlay.

Create the window with the NSWindowStyleMaskBorderless style mask.
Make the window opaque, set the alpha, background color
Use addChildWindow:ordered to position your overlay

This answer explains it quite well.

Something like this:

var rect = NSRect(x: self.window.frame.origin.x, y: self.window.frame.origin.y, width: self.window.contentView.frame.size.width, height: self.window.contentView.frame.size.height)
var overlay = NSWindow.init(contentRect: rect, styleMask: .borderless, backing: .buffered, defer: false)
overlay.backgroundColor = .red
overlay.isOpaque = false
overlay.alphaValue = 0.5
self.window.addChildWindow(overlay, ordered: .above)

Now you can add your overlay view as the window's contentView. The cursor will not change in response to the views below.