Extension to copy the text from the screen

gistfile1.txt

// ==UserScript==
// @name         Enhanced Page Summary (Revised) 1.0
// @namespace    http://tampermonkey.net/
// @version      0.4
// @description  Capture existing and new text content from the DOM and copy to clipboard
// @author       You
// @match        *://*/*
// @grant        GM_setClipboard
// ==/UserScript==

(function() {
    'use strict';

    const TextCollector = {
    textSet: new Set(),

    isVisible: function(element) {
        return !!(element.offsetWidth || element.offsetHeight || element.getClientRects().length);
    },

    collectTextFromNode: function(node) {
        if (node.nodeType === Node.TEXT_NODE && node.parentElement && this.isVisibale(node.parentElement)) {
            const text = node.textContent.trim();
            if (text) this.textSet.add(text);
        } else if (node.nodeType === Node.ELEMENT_NODE && node.tagName !== 'SCRIPT' && node.tagName !== 'STYLE') {
            if (this.isVisible(node)) {
                node.childNodes.forEach(child => this.collectTextFromNode(child));
            }
        }
    },

    collectAllText: function() {
        this.collectTextFromNode(document.body);
    },

    getCollectedText: function() {
        return Array.from(this.textSet).join('\n');
    },

    clear: function() {
        this.textSet.clear();
    }
};

    const DOMObserver = {
        observer: null,
        observing: false,

        init: function() {
            this.observer = new MutationObserver(mutations => {
                mutations.forEach(mutation => {
                    if (mutation.type === 'childList') {
                        mutation.addedNodes.forEach(node => TextCollector.collectTextFromNode(node));
                    }
                });
            });
        },

        start: function() {
            if (!this.observing) {
                this.observer.observe(document.body, { childList: true, subtree: true });
                this.observing = true;
            }
        },

        stop: function() {
            if (this.observing) {
                this.observer.disconnect();
                this.observing = false;
            }
        }
    };

    const UIManager = {
        button: null,

        createButton: function() {
            const shadowHost = document.createElement('div');
            shadowHost.attachShadow({ mode: 'open' });
            shadowHost.style.cssText = 'position: fixed; right: 20px; top: 50%; z-index: 10000;';
            document.body.appendChild(shadowHost);

            this.button = document.createElement('button');
            this.button.textContent = 'Start Listening';
            this.button.style.cssText = `
                all: initial;
                font-family: Arial, sans-serif;
                padding: 10px;
                background-color: #4CAF50;
                color: white;
                border: none;
                border-radius: 5px;
                cursor: pointer;
            `;

            shadowHost.shadowRoot.appendChild(this.button);
        },

        setButtonState: function(isListening) {
            this.button.textContent = isListening ? 'Stop Listening' : 'Start Listening';
        }
    };

    const App = {
        init: function() {
            DOMObserver.init();
            UIManager.createButton();
            this.attachEventListeners();
        },

        attachEventListeners: function() {
            UIManager.button.onclick = this.toggleListening.bind(this);
        },

        toggleListening: function() {
            if (!DOMObserver.observing) {
                TextCollector.clear();
                TextCollector.collectAllText(); // Collect existing text
                DOMObserver.start();
                UIManager.setButtonState(true);
                this.copyToClipboard("Existing text copied to clipboard. Now listening for changes...");
            } else {
                DOMObserver.stop();
                UIManager.setButtonState(false);
                this.copyToClipboard("All collected text copied to clipboard.");
            }
        },

        copyToClipboard: function(message) {
            const allText = TextCollector.getCollectedText();
            GM_setClipboard(allText);
            alert(message);
        }
    };

    App.init();
})();