[Python] I am building a teleprompter. i want my macos screen overlay to be invisible to...

I am facing issue to make the screen invisible to screen sharing or while taking screenshot over the overlay. I am using python, Quartz, cocoa for accessing native MacOS API. I tried different methods but none seems working. PYQT and TKINTER are also very redundant in MACOS. I am not getting any error in displaying overlay but I am not able to make it invisible to screen sharing or screenshot. I am new to MacOS development and it seems it needs advance understanding of MacOS native API. Sample overlay code in python which I am working on to make invisible to share sharing.

How to test if screen is invisible: 1) join any meeting solo/group and do entire screen share. It shouldn’t be visible in screen share. 2) take screenshots using shift+command+3, it shouldn’t be appearing in screenshot.

```python
import objc
import threading
import sys
import os

import Quartz
import base64
from Cocoa import (
NSApplication, NSApp, NSWindow, NSView, NSTextField, NSFont,
NSColor, NSBackingStoreBuffered, NSBorderlessWindowMask,
NSScreen, NSApplicationActivationPolicyRegular, NSApplicationActivationPolicyAccessory,
NSEvent, NSEventMaskKeyDown, NSEventModifierFlagCommand, NSEventModifierFlagShift,
NSMakeRect, NSImage, NSImageView, NSData
)
from Foundation import NSObject


# Custom window level higher than screenshots
NSWindowLevelScreenSaverPlus = 1001

# Window collection behaviors
NSWindowCollectionBehaviorCanJoinAllSpaces = 1 << 0
NSWindowCollectionBehaviorStationary = 1 << 4
NSWindowCollectionBehaviorFullScreenAuxiliary = 1 << 8

class OverlayWindow(NSWindow):
def canBecomeKeyWindow(self):
return False

def canBecomeMainWindow(self):
return False

class AppDelegate(NSObject):
def applicationDidFinishLaunching_(self, notification):
screen = NSScreen.mainScreen()
screen_frame = screen.frame()
frame = NSMakeRect(
screen_frame.size.width * 0.25, # X: start 25% across
screen_frame.size.height * 0.25, # Y: start 25% up
screen_frame.size.width * 0.5, # Width: 50% of screen width
screen_frame.size.height * 0.5 # Height: 50% of screen height
)

self.window = OverlayWindow.alloc().initWithContentRect_styleMask_backing_defer_(
frame,
NSBorderlessWindowMask,
NSBackingStoreBuffered,
False
)

self.window.setBackgroundColor_(NSColor.colorWithCalibratedWhite_alpha_(0, 0.4)) # Semi-transparent black
self.window.setLevel_(NSWindowLevelScreenSaverPlus)
self.window.setOpaque_(False)
self.window.setIgnoresMouseEvents_(False)
self.window.setCollectionBehavior_(
NSWindowCollectionBehaviorCanJoinAllSpaces |
NSWindowCollectionBehaviorStationary |
NSWindowCollectionBehaviorFullScreenAuxiliary
)

# Add instructional text
self.label = NSTextField.alloc().initWithFrame_(NSMakeRect(10, frame.size.height/2 - 50, frame.size.width - 20, 100))

self.label.setStringValue_(
"Shortcuts:\n⌘+⌥+S: Take Screenshot\n⌘+⌥+N: Toggle Overlay\n⌘+⌥+Q: Quit"
)

self.label.setFont_(NSFont.systemFontOfSize_(28))
self.label.setTextColor_(NSColor.whiteColor())
self.label.setBezeled_(False)
self.label.setDrawsBackground_(False)
self.label.setEditable_(False)
self.label.setSelectable_(False)
self.label.setAlignment_(1) # Center
self.window.contentView().addSubview_(self.label)

self.overlay_visible = True
self.preview_image_view = None # Initialize preview field
self.window.orderFrontRegardless()

# Start local key listener
NSEvent.addLocalMonitorForEventsMatchingMask_handler_(
NSEventMaskKeyDown,
self.handleKeyEvent_
)

# Start global key listener
self.global_event_tap = Quartz.CGEventTapCreate(
Quartz.kCGSessionEventTap,
Quartz.kCGHeadInsertEventTap,
Quartz.kCGEventTapOptionDefault,
Quartz.CGEventMaskBit(Quartz.kCGEventKeyDown),
globalEventCallback,
None
)

self.run_loop_source = Quartz.CFMachPortCreateRunLoopSource(None, self.global_event_tap, 0)
Quartz.CFRunLoopAddSource(
Quartz.CFRunLoopGetCurrent(),
self.run_loop_source,
Quartz.kCFRunLoopCommonModes
)
Quartz.CGEventTapEnable(self.global_event_tap, True)

def globalEventCallback(proxy, type_, event, refcon):
# Look up the AppDelegate instance and call its handler
app_delegate = NSApp().delegate()
app_delegate.handleKeyEvent_(objc.lookUpClass('NSEvent').eventWithCGEvent_(event))
return event

def main():
app = NSApplication.sharedApplication()
delegate = AppDelegate.alloc().init()
NSApp().setDelegate_(delegate)
app.setActivationPolicy_(NSApplicationActivationPolicyAccessory)
app.run()

if __name__ == "__main__":
main()

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