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.

See also.