format id

Signed-off-by: 21pages <pages21@163.com>

flutter/lib/common/formatter/id_formatter.dart

@@ -1,4 +1,52 @@
 import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
 
-/// TODO: Divide every 3 number to display ID
-class IdFormController extends TextEditingController {}
+class IDTextEditingController extends TextEditingController {
+  IDTextEditingController({String? text}) : super(text: text);
+
+  String get id => trimID(value.text);
+
+  set id(String newID) => text = formatID(newID);
+}
+
+class IDTextInputFormatter extends TextInputFormatter {
+  @override
+  TextEditingValue formatEditUpdate(
+      TextEditingValue oldValue, TextEditingValue newValue) {
+    if (newValue.text.isEmpty) {
+      return newValue.copyWith(text: '');
+    } else if (newValue.text.compareTo(oldValue.text) == 0) {
+      return newValue;
+    } else {
+      int selectionIndexFromTheRight =
+          newValue.text.length - newValue.selection.extentOffset;
+      String newID = formatID(newValue.text);
+      return TextEditingValue(
+        text: newID,
+        selection: TextSelection.collapsed(
+          offset: newID.length - selectionIndexFromTheRight,
+        ),
+      );
+    }
+  }
+}
+
+String formatID(String id) {
+  String id2 = id.replaceAll(' ', '');
+  String newID = '';
+  if (id2.length <= 3) {
+    newID = id2;
+  } else {
+    var n = id2.length;
+    var a = n % 3 != 0 ? n % 3 : 3;
+    newID = id2.substring(0, a);
+    for (var i = a; i < n; i += 3) {
+      newID += " ${id2.substring(i, i + 3)}";
+    }
+  }
+  return newID;
+}
+
+String trimID(String id) {
+  return id.replaceAll(' ', '');
+}