mirror of
https://github.com/Yubico/yubioath-flutter.git
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54 lines
2.0 KiB
Dart
Executable File
54 lines
2.0 KiB
Dart
Executable File
/*
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* Copyright (C) 2022 Yubico.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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import 'dart:convert';
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import 'package:flutter/material.dart';
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import 'package:flutter/services.dart';
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/// Get the number of bytes used by a String when encoded to UTF-8.
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int byteLength(String value) => utf8.encode(value).length;
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/// Builds a counter widget showing number of bytes used/available.
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///
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/// Set this as a [TextField.buildCounter] callback to show the number of bytes
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/// used rather than number of characters. [currentValue] should always match
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/// the input text value to measure.
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InputCounterWidgetBuilder buildByteCounterFor(String currentValue) =>
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(context, {required currentLength, required isFocused, maxLength}) {
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final theme = Theme.of(context);
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final caption = theme.textTheme.bodySmall;
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final style = (byteLength(currentValue) <= (maxLength ?? 0))
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? caption
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: caption?.copyWith(color: theme.colorScheme.error);
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return Text(
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maxLength != null ? '${byteLength(currentValue)}/$maxLength' : '',
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style: style,
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semanticsLabel: 'Character count',
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);
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};
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/// Limits the input in length based on the byte length when encoded.
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/// This is generally used together with [buildByteCounterFor].
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TextInputFormatter limitBytesLength(int maxByteLength) =>
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TextInputFormatter.withFunction((oldValue, newValue) {
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final newLength = byteLength(newValue.text);
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if (newLength <= maxByteLength) {
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return newValue;
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}
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return oldValue;
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});
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