2ad79c88d3
Based on https://developers.google.com/web/updates/2015/04/cut-and-copy-commands FF and Safari are currently not supported. OTOH see the following: * http://www.kb.cert.org/vuls/id/338736 * http://occupyflash.org Closes #631 and #947.
114 lines
3.3 KiB
JavaScript
114 lines
3.3 KiB
JavaScript
/**
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* Copyright 2015 Google Inc. All Rights Reserved.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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function MaterialComponentsSnippets() {
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'use strict';
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// Find all code snippets.
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this.snippets = document.querySelectorAll('code.language-markup');
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this.init();
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}
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/**
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* Initializes the MaterialComponentsSnippets components.
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*/
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MaterialComponentsSnippets.prototype.init = function() {
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'use strict';
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[].slice.call(this.snippets).forEach(function(snippet) {
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snippet.addEventListener('click', this.onMouseClickHandler(snippet));
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snippet.addEventListener('mouseout', this.onMouseOutHandler(snippet));
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}, this);
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};
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/**
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* Store strings for class names defined by this component that are used in
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* JavaScript. This allows us to simply change it in one place should we
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* decide to modify at a later date.
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* @enum {string}
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* @private
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*/
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MaterialComponentsSnippets.prototype.CssClasses_ = {
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COPIED: 'copied'
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};
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/**
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* Copies content of a <code> element into the system clipboard.
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* Not all browsers may be supported. See the following for details:
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* http://caniuse.com/clipboard
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* https://developers.google.com/web/updates/2015/04/cut-and-copy-commands
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* @param {HTMLElement} snippet The <code> element containing the snippet code
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* @return {bool} whether the copy operation is succeeded
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*/
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MaterialComponentsSnippets.prototype.copyToClipboard = function(snippet) {
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'use strict';
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var snipRange = document.createRange();
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snipRange.selectNodeContents(snippet);
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window.getSelection().addRange(snipRange);
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var res = false;
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try {
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res = document.execCommand('copy');
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} catch (err) {
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// copy command is not available
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console.error(err);
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}
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try {
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window.getSelection().removeRange(snipRange)
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} catch (err) {
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// removeRange is not available
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// use AllRanges
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window.getSelection().removeAllRanges();
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}
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return res;
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};
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/**
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* Returns a mouseClickHandler for a snippet <code> element.
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* @param {HTMLElement} snippet The <code> element containing the snippet code
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* @return {function} the click handler
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*/
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MaterialComponentsSnippets.prototype.onMouseClickHandler = function(snippet) {
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'use strict';
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var ctx = this;
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return function() {
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if (ctx.copyToClipboard(snippet)) {
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snippet.classList.add(ctx.CssClasses_.COPIED);
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}
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};
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};
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/**
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* Returns a mouseOutHandler for a snippet <code> element.
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* @param {HTMLElement} snippet The <code> element containing the snippet code
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* @return {function} the click handler
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*/
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MaterialComponentsSnippets.prototype.onMouseOutHandler = function(snippet) {
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'use strict';
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var ctx = this;
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return function() {
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snippet.classList.remove(ctx.CssClasses_.COPIED);
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};
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};
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window.addEventListener('load', function() {
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'use strict';
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new MaterialComponentsSnippets();
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});
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