56 lines
1.5 KiB
Dart
56 lines
1.5 KiB
Dart
import 'package:flutter/material.dart';
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import 'package:flutter/services.dart';
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class IDTextEditingController extends TextEditingController {
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IDTextEditingController({String? text}) : super(text: text);
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String get id => trimID(value.text);
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set id(String newID) => text = formatID(newID);
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}
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class IDTextInputFormatter extends TextInputFormatter {
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@override
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TextEditingValue formatEditUpdate(
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TextEditingValue oldValue, TextEditingValue newValue) {
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if (newValue.text.isEmpty) {
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return newValue.copyWith(text: '');
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} else if (newValue.text.compareTo(oldValue.text) == 0) {
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return newValue;
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} else {
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int selectionIndexFromTheRight =
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newValue.text.length - newValue.selection.extentOffset;
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String newID = formatID(newValue.text);
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return TextEditingValue(
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text: newID,
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selection: TextSelection.collapsed(
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offset: newID.length - selectionIndexFromTheRight,
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),
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// https://github.com/flutter/flutter/issues/78066#issuecomment-797869906
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composing: newValue.composing,
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);
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}
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}
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}
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String formatID(String id) {
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String id2 = id.replaceAll(' ', '');
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if (int.tryParse(id2) == null) return id;
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String newID = '';
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if (id2.length <= 3) {
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newID = id2;
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} else {
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var n = id2.length;
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var a = n % 3 != 0 ? n % 3 : 3;
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newID = id2.substring(0, a);
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for (var i = a; i < n; i += 3) {
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newID += " ${id2.substring(i, i + 3)}";
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}
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}
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return newID;
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}
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String trimID(String id) {
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return id.replaceAll(' ', '');
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}
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