Start to update general settings

lib/ui/widgets/settings/text_settings_edit_tile.dart

@@ -0,0 +1,60 @@
+import 'package:comunic/ui/dialogs/single_input_dialog.dart';
+import 'package:comunic/utils/intl_utils.dart';
+import 'package:flutter/material.dart';
+import 'package:settings_ui/settings_ui.dart';
+
+/// Text edit settings tile
+///
+/// @author Pierre HUBERT
+
+bool _defaultCheck(String s) => s.isNotEmpty;
+
+class TextEditSettingsTile extends SettingsTile {
+  final String title;
+  final String currValue;
+  final void Function(String) onChanged;
+  final bool Function(String) checkInput;
+  final bool allowEmptyValues;
+
+  bool get readOnly => onChanged == null;
+
+  const TextEditSettingsTile({
+    Key key,
+    @required this.title,
+    @required this.currValue,
+    @required this.onChanged,
+    this.checkInput = _defaultCheck,
+    this.allowEmptyValues = false,
+  })  : assert(title != null),
+        assert(currValue != null),
+        assert(checkInput != null),
+        assert(allowEmptyValues != null);
+
+  @override
+  Widget build(BuildContext context) {
+    return SettingsTile(
+      title: title,
+      subtitle: currValue,
+      onTap: readOnly ? null : () => _changeValue(context),
+    );
+  }
+
+  void _changeValue(BuildContext context) async {
+    final value = await showDialog<String>(
+      context: context,
+      builder: (b) => SingleInputDialog(
+        title: title,
+        icon: null,
+        initialValue: currValue,
+        label: title,
+        checkInput: checkInput,
+        errorMessage: tr("Invalid value!"),
+        canBeEmpty: allowEmptyValues,
+      ),
+    );
+
+    if (value == null) return;
+
+    onChanged(value);
+  }
+}