ScreenBlocker.py

import ScriptingBridge as sb
import numpy as np
import os
import cv2
import time


def drawCenteredText(img, text, font, scale, color, yPos):
    size = cv2.getTextSize(text, font, scale, 1)
    textWidth = size[0][0]
    textHeight = size[0][1]
    width = img.shape[1]
    cv2.putText(img, text, ((width - textWidth) / 2, yPos), font, scale, color, 1, cv2.CV_AA)

def blockScreen():

    os.system("/usr/bin/osascript -e 'tell application \"System Events\" to click (first button of (every window of (application process \"Google Chrome\")) whose role description is \"minimize button\")'")

    screenWidth, screenHeight = 1440, 900

    img = np.zeros((screenHeight, screenWidth), np.uint8) #Create black empty box

    cv2.rectangle(img, (0, 0), (screenWidth, screenHeight), (50, 50, 50), -1)

    drawCenteredText(img, "Julius", cv2.FONT_HERSHEY_SIMPLEX, 0.5, (255, 255, 255), 60);
    drawCenteredText(img, "Seizure Prevention Triggered", cv2.FONT_HERSHEY_SIMPLEX, 2, (255, 255, 255), screenHeight / 2)
    drawCenteredText(img, "Be Careful When Reopening Chrome", cv2.FONT_HERSHEY_SIMPLEX, .75, (255, 255, 255), screenHeight / 2 +50)
    drawCenteredText(img, "Protection Will Resume When This Window Closes", cv2.FONT_HERSHEY_SIMPLEX, .75, (255, 255, 255), screenHeight / 2 +75)

    cv2.imshow("Julius", img) #Show the screen
    cv2.moveWindow("Julius", 0, 0) #Move the window to the top left corner

    process = sb.SBApplication.applicationWithBundleIdentifier_('com.apple.systemevents').processes().objectWithName_("Python")
    process.setFrontmost_(True)

    cv2.waitKey(5000)
    cv2.destroyAllWindows()