| 1 | /**
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| 2 | * @license
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| 3 | * Copyright Google LLC All Rights Reserved.
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| 4 | *
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| 5 | * Use of this source code is governed by an MIT-style license that can be
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| 6 | * found in the LICENSE file at https://angular.io/license
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| 7 | */
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| 8 | /**
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| 9 | * A pending copy-to-clipboard operation.
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| 10 | *
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| 11 | * The implementation of copying text to the clipboard modifies the DOM and
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| 12 | * forces a relayout. This relayout can take too long if the string is large,
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| 13 | * causing the execCommand('copy') to happen too long after the user clicked.
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| 14 | * This results in the browser refusing to copy. This object lets the
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| 15 | * relayout happen in a separate tick from copying by providing a copy function
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| 16 | * that can be called later.
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| 17 | *
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| 18 | * Destroy must be called when no longer in use, regardless of whether `copy` is
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| 19 | * called.
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| 20 | */
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| 21 | export class PendingCopy {
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| 22 | constructor(text, _document) {
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| 23 | this._document = _document;
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| 24 | const textarea = this._textarea = this._document.createElement('textarea');
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| 25 | const styles = textarea.style;
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| 26 | // Hide the element for display and accessibility. Set a fixed position so the page layout
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| 27 | // isn't affected. We use `fixed` with `top: 0`, because focus is moved into the textarea
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| 28 | // for a split second and if it's off-screen, some browsers will attempt to scroll it into view.
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| 29 | styles.position = 'fixed';
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| 30 | styles.top = styles.opacity = '0';
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| 31 | styles.left = '-999em';
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| 32 | textarea.setAttribute('aria-hidden', 'true');
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| 33 | textarea.value = text;
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| 34 | this._document.body.appendChild(textarea);
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| 35 | }
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| 36 | /** Finishes copying the text. */
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| 37 | copy() {
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| 38 | const textarea = this._textarea;
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| 39 | let successful = false;
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| 40 | try { // Older browsers could throw if copy is not supported.
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| 41 | if (textarea) {
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| 42 | const currentFocus = this._document.activeElement;
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| 43 | textarea.select();
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| 44 | textarea.setSelectionRange(0, textarea.value.length);
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| 45 | successful = this._document.execCommand('copy');
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| 46 | if (currentFocus) {
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| 47 | currentFocus.focus();
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| 48 | }
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| 49 | }
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| 50 | }
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| 51 | catch (_a) {
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| 52 | // Discard error.
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| 53 | // Initial setting of {@code successful} will represent failure here.
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| 54 | }
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| 55 | return successful;
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| 56 | }
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| 57 | /** Cleans up DOM changes used to perform the copy operation. */
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| 58 | destroy() {
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| 59 | const textarea = this._textarea;
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| 60 | if (textarea) {
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| 61 | if (textarea.parentNode) {
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| 62 | textarea.parentNode.removeChild(textarea);
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| 63 | }
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| 64 | this._textarea = undefined;
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| 65 | }
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| 66 | }
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| 67 | }
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| 68 | //# 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