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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:mojom/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) | |
15 : start = position, | |
16 end = position; | |
17 const TextRange.empty() | |
18 : start = -1, | |
19 end = -1; | |
20 | |
21 bool get isValid => start >= 0 && end >= 0; | |
22 bool get isCollapsed => start == end; | |
23 } | |
24 | |
25 class EditableString implements KeyboardClient { | |
26 String text; | |
27 TextRange composing = const TextRange.empty(); | |
28 TextRange selection = const TextRange.empty(); | |
29 | |
30 final StringUpdated onUpdated; | |
31 | |
32 KeyboardClientStub stub; | |
33 | |
34 EditableString({this.text: '', this.onUpdated}) { | |
35 stub = new KeyboardClientStub.unbound()..impl = this; | |
36 } | |
37 | |
38 String textBefore(TextRange range) { | |
39 return text.substring(0, range.start); | |
40 } | |
41 | |
42 String textAfter(TextRange range) { | |
43 return text.substring(range.end); | |
44 } | |
45 | |
46 String textInside(TextRange range) { | |
47 return text.substring(range.start, range.end); | |
48 } | |
49 | |
50 void _delete(TextRange range) { | |
51 if (range.isCollapsed || !range.isValid) return; | |
52 text = textBefore(range) + textAfter(range); | |
53 } | |
54 | |
55 TextRange _append(String newText) { | |
56 int start = text.length; | |
57 text += newText; | |
58 return new TextRange(start: start, end: start + newText.length); | |
59 } | |
60 | |
61 TextRange _replace(TextRange range, String newText) { | |
62 assert(range.isValid); | |
63 | |
64 String before = textBefore(range); | |
65 String after = textAfter(range); | |
66 | |
67 text = before + newText + after; | |
68 return new TextRange( | |
69 start: before.length, end: before.length + newText.length); | |
70 } | |
71 | |
72 TextRange _replaceOrAppend(TextRange range, String newText) { | |
73 if (!range.isValid) return _append(newText); | |
74 return _replace(range, newText); | |
75 } | |
76 | |
77 void commitCompletion(CompletionData completion) { | |
78 // TODO(abarth): Not implemented. | |
79 } | |
80 | |
81 void commitCorrection(CorrectionData correction) { | |
82 // TODO(abarth): Not implemented. | |
83 } | |
84 | |
85 void commitText(String text, int newCursorPosition) { | |
86 // TODO(abarth): Why is |newCursorPosition| always 1? | |
87 TextRange committedRange = _replaceOrAppend(composing, text); | |
88 selection = new TextRange.collapsed(committedRange.end); | |
89 composing = const TextRange.empty(); | |
90 onUpdated(); | |
91 } | |
92 | |
93 void deleteSurroundingText(int beforeLength, int afterLength) { | |
94 TextRange beforeRange = new TextRange( | |
95 start: selection.start - beforeLength, end: selection.start); | |
96 TextRange afterRange = | |
97 new TextRange(start: selection.end, end: selection.end + afterLength); | |
98 _delete(afterRange); | |
99 _delete(beforeRange); | |
100 selection = new TextRange( | |
101 start: selection.start - beforeLength, | |
102 end: selection.end - beforeLength); | |
103 onUpdated(); | |
104 } | |
105 | |
106 void setComposingRegion(int start, int end) { | |
107 composing = new TextRange(start: start, end: end); | |
108 onUpdated(); | |
109 } | |
110 | |
111 void setComposingText(String text, int newCursorPosition) { | |
112 // TODO(abarth): Why is |newCursorPosition| always 1? | |
113 composing = _replaceOrAppend(composing, text); | |
114 selection = new TextRange.collapsed(composing.end); | |
115 onUpdated(); | |
116 } | |
117 | |
118 void setSelection(int start, int end) { | |
119 selection = new TextRange(start: start, end: end); | |
120 onUpdated(); | |
121 } | |
122 } | |
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