Not open NSWindow has isVisible property set to true - swift

Question

I'm trying to detect if NSWindow is open or closed using the isVisible property of NSWindow, but it is not working as I expected. For example I overrode the loadWindow method of my NSWindowController (I need to show a fullscreen web on the extended screen):
override func loadWindow() {
self.contentController = WKUserContentController();
guard let contentController = self.contentController else {
return
}
let config = WKWebViewConfiguration()
config.userContentController = contentController
let externalScreens = NSScreen.externalScreens()
let screen = externalScreens.count == 0 ? NSScreen.main()! : externalScreens[0]
window = KeyWindow(
contentRect: NSRect(x: 0, y: 0, width: screen.frame.width, height: screen.frame.height),
styleMask: NSBorderlessWindowMask,
backing: NSBackingStoreType.buffered,
defer: false,
screen: screen
)
if let w = window {
w.level = Int(CGShieldingWindowLevel())
w.backgroundColor = NSColor.black
w.makeKeyAndOrderFront(self)
w.makeFirstResponder(self)
webView = WKWebView(frame: w.frame, configuration: config)
w.contentView = webView!
debugPrint("Window is visible = \(w.isVisible)")
}
}
KeyWindow:
import Foundation
import AppKit
class KeyWindow : NSWindow {
override var canBecomeKey: Bool {
return true
}
}
but debugPrint shows that isVisible property is set to true, although the window was not opened yet (self.showWindow(self) method of controller was not called yet).
How can I reliably find out if window is open (displayed on screen) or not?

Answer 1

in your code
if let w = window {
w.level = Int(CGShieldingWindowLevel())
w.backgroundColor = NSColor.black
w.makeKeyAndOrderFront(self)
w.makeFirstResponder(self)
webView = WKWebView(frame: w.frame, configuration: config)
w.contentView = webView!
debugPrint("Window is visible = \(w.isVisible)")
}
you are calling w.makeKeyAndOrderFront(self) before the check
according to the Apple documentation:
func makeKeyAndOrderFront(Any?) Moves the window to the front of the
screen list, within its level, and makes it the key window; that is,
it shows the window.
So technically the isVisible works as advertised :)
isVisible
The value of this property is true when the window is onscreen (even
if it’s obscured by other windows); otherwise, false.
You window should be onscreen - despite the fact that you have set it's level as CGShieldingWindowLevel it maybe just invisible due to call of
w.makeKeyAndOrderFront(self) you can try to call func orderFrontRegardless()
Apple Doc
In this case it shall show the window immediately - but I think it is another SO Question