jupyterlab-emrys/lib/clipboard/index.js

A computational environment for Jupyter. Powered by Emrys

// Copyright (c) Jupyter Development Team.
// Distributed under the terms of the Modified BSD License.
"use strict";
/**
 * Copy text to the system clipboard.
 *
 * #### Notes
 * This can only be called in response to a user input event.
 */
function copyToClipboard(text) {
    var node = document.body;
    var handler = function (event) {
        var data = event.clipboardData || window.clipboardData;
        data.setData('text', text);
        event.preventDefault();
        node.removeEventListener('copy', handler);
    };
    node.addEventListener('copy', handler);
    generateClipboardEvent(node);
}
exports.copyToClipboard = copyToClipboard;
/**
 * Generate a clipboard event on a node.
 *
 * @param node - The element on which to generate the event.
 *
 * @param type - The type of event to generate: `'copy'` or `'cut'`.
 *   `'paste'` events cannot be programmatically generated.
 *
 * #### Notes
 * This can only be called in response to a user input event.
 */
function generateClipboardEvent(node, type) {
    // http://stackoverflow.com/a/5210367
    if (type === void 0) { type = 'copy'; }
    // Identify selected text.
    var sel = window.getSelection();
    // Save the current selection.
    var savedRanges = [];
    for (var i = 0, len = sel.rangeCount; i < len; ++i) {
        savedRanges[i] = sel.getRangeAt(i).cloneRange();
    }
    // Select the node content.
    var range = document.createRange();
    range.selectNodeContents(node);
    sel.removeAllRanges();
    sel.addRange(range);
    // Execute the command.
    document.execCommand(type);
    // Restore the previous selection.
    sel = window.getSelection();
    sel.removeAllRanges();
    for (var i = 0, len = savedRanges.length; i < len; ++i) {
        sel.addRange(savedRanges[i]);
    }
}
exports.generateClipboardEvent = generateClipboardEvent;