node_modules/@angular/cdk/esm2015/drag-drop/clone-node.js

/**
 * @license
 * Copyright Google LLC All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.io/license
 */
/** Creates a deep clone of an element. */
export function deepCloneNode(node) {
    const clone = node.cloneNode(true);
    const descendantsWithId = clone.querySelectorAll('[id]');
    const nodeName = node.nodeName.toLowerCase();
    // Remove the `id` to avoid having multiple elements with the same id on the page.
    clone.removeAttribute('id');
    for (let i = 0; i < descendantsWithId.length; i++) {
        descendantsWithId[i].removeAttribute('id');
    }
    if (nodeName === 'canvas') {
        transferCanvasData(node, clone);
    }
    else if (nodeName === 'input' || nodeName === 'select' || nodeName === 'textarea') {
        transferInputData(node, clone);
    }
    transferData('canvas', node, clone, transferCanvasData);
    transferData('input, textarea, select', node, clone, transferInputData);
    return clone;
}
/** Matches elements between an element and its clone and allows for their data to be cloned. */
function transferData(selector, node, clone, callback) {
    const descendantElements = node.querySelectorAll(selector);
    if (descendantElements.length) {
        const cloneElements = clone.querySelectorAll(selector);
        for (let i = 0; i < descendantElements.length; i++) {
            callback(descendantElements[i], cloneElements[i]);
        }
    }
}
// Counter for unique cloned radio button names.
let cloneUniqueId = 0;
/** Transfers the data of one input element to another. */
function transferInputData(source, clone) {
    // Browsers throw an error when assigning the value of a file input programmatically.
    if (clone.type !== 'file') {
        clone.value = source.value;
    }
    // Radio button `name` attributes must be unique for radio button groups
    // otherwise original radio buttons can lose their checked state
    // once the clone is inserted in the DOM.
    if (clone.type === 'radio' && clone.name) {
        clone.name = `mat-clone-${clone.name}-${cloneUniqueId++}`;
    }
}
/** Transfers the data of one canvas element to another. */
function transferCanvasData(source, clone) {
    const context = clone.getContext('2d');
    if (context) {
        // In some cases `drawImage` can throw (e.g. if the canvas size is 0x0).
        // We can't do much about it so just ignore the error.
        try {
            context.drawImage(source, 0, 0);
        }
        catch (_a) { }
    }
}
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