xfer

veilid-flutter/example/lib/history_wrapper.dart

@@ -0,0 +1,68 @@
+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,
+    );
+  }
+}