| /** |
| * @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 |
| */ |
| /** |
| * A pending copy-to-clipboard operation. |
| * |
| * The implementation of copying text to the clipboard modifies the DOM and |
| * forces a relayout. This relayout can take too long if the string is large, |
| * causing the execCommand('copy') to happen too long after the user clicked. |
| * This results in the browser refusing to copy. This object lets the |
| * relayout happen in a separate tick from copying by providing a copy function |
| * that can be called later. |
| * |
| * Destroy must be called when no longer in use, regardless of whether `copy` is |
| * called. |
| */ |
| export class PendingCopy { |
| constructor(text, _document) { |
| this._document = _document; |
| const textarea = this._textarea = this._document.createElement('textarea'); |
| const styles = textarea.style; |
| // Hide the element for display and accessibility. Set a fixed position so the page layout |
| // isn't affected. We use `fixed` with `top: 0`, because focus is moved into the textarea |
| // for a split second and if it's off-screen, some browsers will attempt to scroll it into view. |
| styles.position = 'fixed'; |
| styles.top = styles.opacity = '0'; |
| styles.left = '-999em'; |
| textarea.setAttribute('aria-hidden', 'true'); |
| textarea.value = text; |
| this._document.body.appendChild(textarea); |
| } |
| /** Finishes copying the text. */ |
| copy() { |
| const textarea = this._textarea; |
| let successful = false; |
| try { // Older browsers could throw if copy is not supported. |
| if (textarea) { |
| const currentFocus = this._document.activeElement; |
| textarea.select(); |
| textarea.setSelectionRange(0, textarea.value.length); |
| successful = this._document.execCommand('copy'); |
| if (currentFocus) { |
| currentFocus.focus(); |
| } |
| } |
| } |
| catch (_a) { |
| // Discard error. |
| // Initial setting of {@code successful} will represent failure here. |
| } |
| return successful; |
| } |
| /** Cleans up DOM changes used to perform the copy operation. */ |
| destroy() { |
| const textarea = this._textarea; |
| if (textarea) { |
| if (textarea.parentNode) { |
| textarea.parentNode.removeChild(textarea); |
| } |
| this._textarea = undefined; |
| } |
| } |
| } |
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|
