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1 // Listen for shift-backspace or unmodified backspace and navigate if not in | 1 // Copyright 2016 Google Inc. All rights reserved. |
2 // an editable field. We capture the event at the Window to let any handlers | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // or listeners registered on the Document have a chance to handle it first. | 3 // found in the LICENSE file. |
4 window.addEventListener('keydown', function(e) { | 4 |
| 5 // Load the options, then register a keyboard listener. We capture the event |
| 6 // at the Window to let any handlers or listeners registered on the Document |
| 7 // have a chance to handle it first. |
| 8 var options; |
| 9 chrome.storage.sync.get({ |
| 10 blacklist: [], |
| 11 disableInApplets: true, |
| 12 whitelist: [] |
| 13 }, function(items) { |
| 14 options = items; |
| 15 window.addEventListener('keydown', function(e) { |
| 16 handleBackspace(e); |
| 17 }); |
| 18 }); |
| 19 |
| 20 // Update the local options when they're changed externally. |
| 21 chrome.storage.onChanged.addListener(function(changes, area) { |
| 22 if (area === 'sync') { |
| 23 if (changes.blacklist) |
| 24 options.blacklist = changes.blacklist.newValue; |
| 25 if (changes.disableInApplets) |
| 26 options.disableInApplets = changes.disableInApplets.newValue; |
| 27 if (changes.whitelist) |
| 28 options.whitelist = changes.whitelist.newValue; |
| 29 } |
| 30 }); |
| 31 |
| 32 // Check for shift-backspace or unmodified backspace and navigate if |
| 33 // applicable. |
| 34 function handleBackspace(e) { |
| 35 if (e.defaultPrevented || |
| 36 e.key !== 'Backspace' || |
| 37 e.altKey || |
| 38 e.ctrlKey || |
| 39 e.metaKey) |
| 40 return; |
| 41 |
| 42 // The blacklist overrides everything. |
| 43 var url = window.location.href; |
| 44 if (options.blacklist.includes(url)) |
| 45 return; |
| 46 |
| 47 // The whitelist overrides applet focus. |
5 // Listening on the Window means the event has no path (see | 48 // Listening on the Window means the event has no path (see |
6 // http://crbug.com/645527), so we'll have to look at the focused (active) | 49 // http://crbug.com/645527), so we'll have to look at the focused (active) |
7 // element. This means it will not work properly with shadow DOM. | 50 // element. This means it will not work properly with shadow DOM. |
8 // TODO: Fix behavior with shadow DOM when the above bug is resolved. | 51 // TODO: Fix behavior with shadow DOM when the above bug is resolved. |
9 if (e.key === 'Backspace' && | 52 if (!options.whitelist.includes(url) && |
10 !e.defaultPrevented && | 53 disabledInApplet(document.activeElement)) |
11 !e.altKey && | 54 return; |
12 !e.ctrlKey && | 55 if (isEditable(document.activeElement)) |
13 !e.metaKey && | 56 return; |
14 !isEditable(document.activeElement)) { | 57 |
15 e.shiftKey ? window.history.forward(): window.history.back(); | 58 e.shiftKey ? window.history.forward(): window.history.back(); |
16 e.preventDefault(); | 59 e.preventDefault(); |
| 60 } |
| 61 |
| 62 // Return true if the option to disable the extension in applets is enabled, |
| 63 // and focus is in an embedded Flash or Java applet. |
| 64 function disabledInApplet(target) { |
| 65 if (!options.disableInApplets) |
| 66 return false; |
| 67 |
| 68 var nodeName = target.nodeName.toUpperCase(); |
| 69 var nodeType = target.type || ''; |
| 70 nodeType = nodeType.toLowerCase(); |
| 71 if ((nodeName === 'EMBED' || nodeName === 'OBJECT') && |
| 72 (nodeType === 'application/x-shockwave-flash' || |
| 73 nodeType === 'application/java')) { |
| 74 return true; |
17 } | 75 } |
18 }); | 76 return false; |
| 77 } |
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