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Merge pull request #116 from peercoin/0.7.4_1
0.7.4
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,56 @@ | ||
| import 'dart:convert'; | ||
| import 'dart:math'; | ||
|
|
||
| import 'package:characters/src/extensions.dart'; | ||
| import 'package:flutter/services.dart'; | ||
|
|
||
| class Utf8LengthLimitingTextInputFormatter extends TextInputFormatter { | ||
| Utf8LengthLimitingTextInputFormatter(this.maxLength) | ||
| : assert(maxLength == -1 || maxLength > 0); | ||
|
|
||
| final int maxLength; | ||
|
|
||
| @override | ||
| TextEditingValue formatEditUpdate( | ||
| TextEditingValue oldValue, | ||
| TextEditingValue newValue, | ||
| ) { | ||
| if (maxLength > 0 && bytesLength(newValue.text) > maxLength) { | ||
| // If already at the maximum and tried to enter even more, keep the old value. | ||
| if (bytesLength(oldValue.text) == maxLength) { | ||
| return oldValue; | ||
| } | ||
| return truncate(newValue, maxLength); | ||
| } | ||
| return newValue; | ||
| } | ||
|
|
||
| static TextEditingValue truncate(TextEditingValue value, int maxLength) { | ||
| var newValue = ''; | ||
| if (bytesLength(value.text) > maxLength) { | ||
| var length = 0; | ||
|
|
||
| value.text.characters.takeWhile((char) { | ||
| var nbBytes = bytesLength(char); | ||
| if (length + nbBytes <= maxLength) { | ||
| newValue += char; | ||
| length += nbBytes; | ||
| return true; | ||
| } | ||
| return false; | ||
| }); | ||
| } | ||
| return TextEditingValue( | ||
| text: newValue, | ||
| selection: value.selection.copyWith( | ||
| baseOffset: min(value.selection.start, newValue.length), | ||
| extentOffset: min(value.selection.end, newValue.length), | ||
| ), | ||
| composing: TextRange.empty, | ||
| ); | ||
| } | ||
|
|
||
| static int bytesLength(String value) { | ||
| return utf8.encode(value).length; | ||
| } | ||
| } |
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