@angular/cdk
Version:
Angular Material Component Development Kit
100 lines • 8.35 kB
JavaScript
/**
* @fileoverview added by tsickle
* Generated from: src/cdk/clipboard/pending-copy.ts
* @suppress {checkTypes,constantProperty,extraRequire,missingOverride,missingReturn,unusedPrivateMembers,uselessCode} checked by tsc
*/
/**
* @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 {
/**
* @param {?} text
* @param {?} _document
*/
constructor(text, _document) {
this._document = _document;
/** @type {?} */
const textarea = this._textarea = this._document.createElement('textarea');
/** @type {?} */
const styles = textarea.style;
// Hide the element for display and accessibility. Set an
// absolute position so the page layout isn't affected.
styles.opacity = '0';
styles.position = 'absolute';
styles.left = styles.top = '-999em';
textarea.setAttribute('aria-hidden', 'true');
textarea.value = text;
this._document.body.appendChild(textarea);
}
/**
* Finishes copying the text.
* @return {?}
*/
copy() {
/** @type {?} */
const textarea = this._textarea;
/** @type {?} */
let successful = false;
try { // Older browsers could throw if copy is not supported.
if (textarea) {
/** @type {?} */
const currentFocus = this._document.activeElement;
textarea.select();
textarea.setSelectionRange(0, textarea.value.length);
successful = this._document.execCommand('copy');
if (currentFocus && currentFocus instanceof HTMLElement) {
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.
* @return {?}
*/
destroy() {
/** @type {?} */
const textarea = this._textarea;
if (textarea) {
if (textarea.parentNode) {
textarea.parentNode.removeChild(textarea);
}
this._textarea = undefined;
}
}
}
if (false) {
/**
* @type {?}
* @private
*/
PendingCopy.prototype._textarea;
/**
* @type {?}
* @private
*/
PendingCopy.prototype._document;
}
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