refactor: settings page

ui/lib/settings/dialog.dart

@@ -0,0 +1,55 @@
+import 'package:flutter/material.dart';
+import 'package:ui/widgets/utils.dart';
+
+Future<void> showSettingDialog(BuildContext context,String title, bool showDelete, Widget body,
+    Future Function() onSubmit, Future Function() onDelete) {
+  return showDialog<void>(
+      context: context,
+      barrierDismissible: true,
+      builder: (BuildContext context) {
+        return AlertDialog(
+          title: Text(title),
+          content: SingleChildScrollView(
+            child: SizedBox(
+              width: 300,
+              child: body,
+            ),
+          ),
+          actions: <Widget>[
+            showDelete
+                ? TextButton(
+                    onPressed: () {
+                      final f = onDelete();
+                      f.then((v) {
+                        Utils.showSnakeBar("删除成功");
+                        Navigator.of(context).pop();
+                      }).onError((e, s) {
+                        Utils.showSnakeBar("删除失败：$e");
+                      });
+                    },
+                    child: const Text(
+                      '删除',
+                      style: TextStyle(color: Colors.red),
+                    ))
+                : const Text(""),
+            TextButton(
+                onPressed: () => Navigator.of(context).pop(),
+                child: const Text('取消')),
+            TextButton(
+              child: const Text('确定'),
+              onPressed: () {
+                final f = onSubmit();
+                f.then((v) {
+                  Utils.showSnakeBar("操作成功");
+                  Navigator.of(context).pop();
+                }).onError((e, s) {
+                  if (e.toString() != "validation_error") {
+                    Utils.showSnakeBar("操作失败：$e");
+                  }
+                });
+              },
+            ),
+          ],
+        );
+      });
+}