User:Arthurfragoso/ResizingDragBar.js

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This user script seems to have a documentation page at User:Arthurfragoso/ResizingDragBar.

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// ==UserScript==
// @name         ResizingDragBar
// @namespace    https://en.wikipedia.org/wiki/User:Arthurfragoso/ResizingDragBar.js
// @version      1.0
// @description  Add a draggable resizing bar to Wikipedia text areas.
// @author       Arthurfragoso
// @match        https://*.wikipedia.org/w/index.php?*action=*
// @icon         https://en.wikipedia.org/static/favicon/wikipedia.ico
// @grant        none
// @run-at       document-end
// ==/UserScript==

/*
 * Inspired by WikiEditor.
 * written with the help of ChatGPT
 *
 * */


(async function () {
    'use strict';

    // Adds the WpExtnSideBySideEnabled CSS class to the HTML tag,
    // This allows for external scripts to check if it is enabled.
    // It also prevents two versions of the script to be run at the same time,
    // In case it is activated in Wikipedia and as a browser user script
    if (document.documentElement.classList.contains("WpExtnResizingDragBar")) {
        return;
    }
    document.documentElement.classList.add("WpExtnResizingDragBar");

    // Function to add a draggable resizing bar
    function addResizingBar(textArea) {
        const dragBar = document.createElement('div');
        dragBar.id = 'ext-ResizingDragBar';
        dragBar.style.width = '100%';
        dragBar.style.height = '10px';
        dragBar.style.cursor = 'row-resize';
        dragBar.style.backgroundColor = '#ccc';

        // Insert the drag bar below the text area
        textArea.parentNode.insertBefore(dragBar, textArea.nextSibling);

        let isDragging = false;

        // Mouse events
        dragBar.addEventListener('mousedown', (e) => {
            e.preventDefault();
            isDragging = true;
            document.body.style.userSelect = 'none'; // Prevent text selection during drag
        });

        document.addEventListener('mousemove', (e) => {
            if (!isDragging) return;

            const newHeight = e.clientY - textArea.getBoundingClientRect().top;
            textArea.style.height = `${Math.max(newHeight, 100)}px`; // Set a minimum height
        });

        document.addEventListener('mouseup', () => {
            isDragging = false;
            document.body.style.userSelect = ''; // Restore text selection
        });
    }

    // Wait to check if WikiEditor is available
    setTimeout(() => {
        // Only load if WikiEditor is not available, as it already has a RisizingBar.
        if (document.querySelector('.ext-WikiEditor-ResizingDragBar')){
            return false;
        }
        const textArea = document.querySelector('#wpTextbox1'); // Wikipedia's editing textarea
        if (textArea) {
            textArea.style.resize = 'none'; // Disable default resizing
            textArea.style.overflow = 'auto';
            addResizingBar(textArea);
        }
    },1000);
})();