veilid/veilid-flutter/example/lib/history_wrapper.dart

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2.3 KiB
Dart
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2022-12-14 16:50:33 -05:00
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
// TextField History Wrapper
class HistoryWrapper {
final List<String> _history = [];
int _historyPosition = 0;
final _historyTextEditingController = TextEditingController();
String _historyCurrentEdit = "";
TextEditingController get controller {
return _historyTextEditingController;
}
void submit(String v) {
// add to history
if (_history.isEmpty || _history.last != v) {
_history.add(v);
if (_history.length > 100) {
_history.removeAt(0);
}
}
_historyPosition = _history.length;
_historyTextEditingController.text = "";
}
Widget wrap(
void Function(void Function())? stateSetter, TextField textField) {
void Function(void Function()) setState = stateSetter ?? (x) => x();
return KeyboardListener(
onKeyEvent: (KeyEvent event) {
setState(() {
if (event.runtimeType == KeyDownEvent &&
event.logicalKey == LogicalKeyboardKey.arrowUp) {
if (_historyPosition > 0) {
if (_historyPosition == _history.length) {
_historyCurrentEdit = _historyTextEditingController.text;
}
_historyPosition -= 1;
_historyTextEditingController.text = _history[_historyPosition];
}
} else if (event.runtimeType == KeyDownEvent &&
event.logicalKey == LogicalKeyboardKey.arrowDown) {
if (_historyPosition < _history.length) {
_historyPosition += 1;
if (_historyPosition == _history.length) {
_historyTextEditingController.text = _historyCurrentEdit;
} else {
_historyTextEditingController.text = _history[_historyPosition];
}
}
} else if (event.runtimeType == KeyDownEvent) {
_historyPosition = _history.length;
_historyCurrentEdit = _historyTextEditingController.text;
}
});
},
focusNode: FocusNode(onKey: (FocusNode node, RawKeyEvent event) {
if (event.logicalKey == LogicalKeyboardKey.arrowDown ||
event.logicalKey == LogicalKeyboardKey.arrowUp) {
return KeyEventResult.handled;
}
return KeyEventResult.ignored;
}),
child: textField,
);
}
}