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PreventPageVisibilityAuto

10/4/2023, 5:07:06 PM

// ==UserScript==
// @name        PreventPageVisibilityAuto
// @namespace   PreventPageVisibilityAuto
// @match       *://*/*
// @run-at      document-start
// @grant       GM_getValue
// @grant       GM_setValue
// @grant       GM_addStyle
// @grant       GM_registerMenuCommand
// @version     1.1
// @author      -
// @description 10/4/2023, 5:07:06 PM
// ==/UserScript==

var defaultvalue = 'none';
var name = 'PreventPageVisibilityAuto';
var prefix = "autoinject" + name;
var value = GM_getValue("value" + name + document.domain, defaultvalue);
console.log(value);
var injectedStatus = false;
var hostarray = [];

function inject() {
    //if (window.self !== window.top) return; // Not in frames
    if (injectedStatus !== false) return; // Not if already injected
let events_to_block = [
  "visibilitychange",
  "webkitvisibilitychange",
  "mozvisibilitychange",
  "hasFocus",
  "blur",
  "focus",
  "mouseleave"
]
for (event_name of events_to_block) {
  document.addEventListener(event_name, function (event) {
      event.preventDefault();
      event.stopPropagation();
      event.stopImmediatePropagation();
  }, true);
}

for (event_name of events_to_block) {
  window.addEventListener(event_name, function (event) {
      event.preventDefault();
      event.stopPropagation();
      event.stopImmediatePropagation();
  }, true);
}

document.hasFocus = function () { return true; };
document["onvisibilitychange"] = null;
Object.defineProperty(document, "visibilityState", { value: "visible" });
Object.defineProperty(document, "hidden", { value: false });
Object.defineProperty(document, "mozHidden", { value: false });
Object.defineProperty(document, "webkitHidden", { value: false });
Object.defineProperty(document, "webkitVisibilityState", { value: "visible" });
    injectedStatus = true;
}

function addHost() {
    hostarray.push(location.hostname);
    GM_setValue(prefix, JSON.stringify(hostarray));
    if (injectedStatus == false) inject;
}

function set() {
    var val = window.prompt("Enter " + name + document.domain + " value", defaultvalue);
    val = parseInt(val);
    if (val == undefined) {
        return false;
    }
    GM_setValue("value" + name + document.domain, val);
}

function plus() {
    var value = GM_getValue("value" + name + document.domain, defaultvalue);
    GM_setValue("value" + name + document.domain, value + 1);
}

function minus() {
    var value = GM_getValue("value" + name + document.domain, defaultvalue);
    GM_setValue("value" + name + document.domain, value - 1);
}

function removeHost() {
    var index = hostarray.indexOf(location.hostname);
    if (index > -1) {
        hostarray.splice(index, 1);
        GM_setValue(prefix, JSON.stringify(hostarray));
    }
}
// This should work in Violentmonkey and Tampermonkey, but unfortunately not Greasemonkey.
try {
    hostarray = JSON.parse(GM_getValue(prefix, "[]"));
    if (typeof (value) == 'number') {
        GM_registerMenuCommand("+", plus);
        GM_registerMenuCommand("-", minus);
    }
    GM_registerMenuCommand("Set " + name, set);
    if (hostarray.includes(location.hostname)) {
        inject();
        injectedStatus = true;
        GM_registerMenuCommand("Stop Auto-Injecting " + name, removeHost);
    } else {
        GM_registerMenuCommand("Inject " + name, inject);
        GM_registerMenuCommand("Auto-Inject on " + location.hostname, addHost);
    }
} catch (err) {
    console.log("Error adding Inject menu items: " + name);
    console.log(err);
}