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1 // Copyright 2015 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 import 'package:sky/services/keyboard/keyboard.mojom.dart'; | |
6 | |
7 typedef void StringUpdated(); | |
8 | |
9 class TextRange { | |
10 final int start; | |
11 final int end; | |
12 | |
13 TextRange({this.start, this.end}); | |
14 TextRange.collapsed(int position) : start = position, end = position; | |
15 const TextRange.empty() : start = -1, end = -1; | |
16 | |
17 bool get isValid => start >= 0 && end >= 0; | |
18 bool get isCollapsed => start == end; | |
19 } | |
20 | |
21 class EditableString implements KeyboardClient { | |
22 String text; | |
23 TextRange composing = const TextRange.empty(); | |
24 TextRange selection = const TextRange.empty(); | |
25 | |
26 final StringUpdated onUpdated; | |
27 | |
28 KeyboardClientStub stub; | |
29 | |
30 EditableString({this.text: '', this.onUpdated}) { | |
31 stub = new KeyboardClientStub.unbound()..impl = this; | |
32 } | |
33 | |
34 String textBefore(TextRange range) { | |
35 return text.substring(0, range.start); | |
36 } | |
37 | |
38 String textAfter(TextRange range) { | |
39 return text.substring(range.end); | |
40 } | |
41 | |
42 String textInside(TextRange range) { | |
43 return text.substring(range.start, range.end); | |
44 } | |
45 | |
46 void _delete(TextRange range) { | |
47 if (range.isCollapsed || !range.isValid) | |
48 return; | |
49 text = textBefore(range) + textAfter(range); | |
50 } | |
51 | |
52 TextRange _append(String newText) { | |
53 int start = text.length; | |
54 text += newText; | |
55 return new TextRange(start: start, end: start + newText.length); | |
56 } | |
57 | |
58 TextRange _replace(TextRange range, String newText) { | |
59 assert(range.isValid); | |
60 | |
61 String before = textBefore(range); | |
62 String after = textAfter(range); | |
63 | |
64 text = before + newText + after; | |
65 return new TextRange(start: before.length, | |
66 end: before.length + newText.length); | |
67 } | |
68 | |
69 TextRange _replaceOrAppend(TextRange range, String newText) { | |
70 if (!range.isValid) | |
71 return _append(newText); | |
72 return _replace(range, newText); | |
73 } | |
74 | |
75 void commitCompletion(CompletionData completion) { | |
76 // TODO(abarth): Not implemented. | |
77 } | |
78 | |
79 void commitCorrection(CorrectionData correction) { | |
80 // TODO(abarth): Not implemented. | |
81 } | |
82 | |
83 void commitText(String text, int newCursorPosition) { | |
84 // TODO(abarth): Why is |newCursorPosition| always 1? | |
85 TextRange committedRange = _replaceOrAppend(composing, text); | |
86 selection = new TextRange.collapsed(committedRange.end); | |
87 composing = const TextRange.empty(); | |
88 onUpdated(); | |
89 } | |
90 | |
91 void deleteSurroundingText(int beforeLength, int afterLength) { | |
92 TextRange beforeRange = new TextRange(start: selection.start - beforeLength, | |
93 end: selection.start); | |
94 TextRange afterRange = new TextRange(start: selection.end, | |
95 end: selection.end + afterLength); | |
96 _delete(afterRange); | |
97 _delete(beforeRange); | |
98 selection = new TextRange(start: selection.start - beforeLength, | |
99 end: selection.end - beforeLength); | |
100 onUpdated(); | |
101 } | |
102 | |
103 void setComposingRegion(int start, int end) { | |
104 composing = new TextRange(start: start, end: end); | |
105 onUpdated(); | |
106 } | |
107 | |
108 void setComposingText(String text, int newCursorPosition) { | |
109 // TODO(abarth): Why is |newCursorPosition| always 1? | |
110 composing = _replaceOrAppend(composing, text); | |
111 selection = new TextRange.collapsed(composing.end); | |
112 onUpdated(); | |
113 } | |
114 | |
115 void setSelection(int start, int end) { | |
116 selection = new TextRange(start: start, end: end); | |
117 onUpdated(); | |
118 } | |
119 } | |
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