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1 // Copyright 2017 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 /** | |
6 * @fileoverview Manages a sequence of braille key events. | |
7 */ | |
8 | |
9 goog.provide('BrailleKeyEventSequenceReducer'); | |
10 | |
11 goog.require('Output'); | |
12 goog.require('cvox.BrailleKeyEvent'); | |
13 | |
14 /** | |
15 * A class that transforms a sequence of braille key events into a standard key | |
16 * event. | |
17 * @constructor | |
18 */ | |
19 BrailleKeyEventSequenceReducer = function() { | |
20 /** @private {Object} */ | |
dmazzoni
2017/04/17 04:53:25
Use a more specific type. Looks like a nullable re
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21 this.incrementalKey_ = null; | |
22 }; | |
23 | |
24 BrailleKeyEventSequenceReducer.prototype = { | |
25 /** | |
26 * Accumulates and optionally modifies in-coming braille key events. | |
27 * @param {cvox.BrailleKeyEvent} evt | |
28 * @return {boolean} False to continue event propagation. | |
29 */ | |
30 onBrailleKeyEvent: function(evt) { | |
31 var standardKeyCode; | |
32 var dots = evt.brailleDots; | |
33 if (!dots) { | |
34 this.incrementalKey_ = {}; | |
35 return false; | |
36 } | |
37 | |
38 if (evt.command == cvox.BrailleKeyCommand.CHORD) { | |
39 Output.forceModeForNextSpeechUtterance(cvox.QueueMode.CATEGORY_FLUSH); | |
40 var modifiers = cvox.BrailleKeyEvent.brailleDotsToModifiers[dots]; | |
41 | |
42 // Check for a modifier mapping. | |
43 if (modifiers) { | |
44 this.incrementalKey_ = this.incrementalKey_ || {}; | |
45 for (var key in modifiers) { | |
46 this.incrementalKey_[key] = true; | |
47 } | |
48 | |
49 return true; | |
50 } | |
51 | |
52 // Check for a chord to standard key mapping. | |
53 standardKeyCode = | |
54 cvox.BrailleKeyEvent.brailleChordsToStandardKeyCode[dots]; | |
55 } | |
56 | |
57 // Check for a 'dots' command, which is typed on the keyboard with a | |
58 // previous incremental key press. | |
59 if (evt.command == cvox.BrailleKeyCommand.DOTS && this.incrementalKey_) { | |
60 // Check if this braille pattern has a standard key mapping. | |
61 standardKeyCode = | |
62 cvox.BrailleKeyEvent.brailleDotsToStandardKeyCode[dots]; | |
63 } | |
64 | |
65 if (standardKeyCode) { | |
66 evt.command = cvox.BrailleKeyCommand.STANDARD_KEY; | |
67 evt.standardKeyCode = standardKeyCode; | |
68 if (this.incrementalKey_) { | |
69 // Apply all modifiers seen so far to the outgoing event as a standard | |
70 // keyboard command. | |
71 evt.altKey = this.incrementalKey_.altKey; | |
72 evt.ctrlKey = this.incrementalKey_.ctrlKey; | |
73 evt.shiftKey = this.incrementalKey_.shiftKey; | |
dmazzoni
2017/04/17 04:53:24
Would be nice to support Search too in a future ch
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74 this.incrementalKey_ = null; | |
dmazzoni
2017/04/17 04:53:25
Why not just set it to {} here and then you don't
David Tseng
2017/04/17 16:10:51
Actually, the null state is important.
I've:
- re
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75 } | |
76 return false; | |
77 } | |
78 | |
79 this.incrementalKey_ = null; | |
80 return false; | |
81 } | |
82 }; | |
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