update: 完成markdown动态更新

lib/components/loading.dart

@@ -0,0 +1,94 @@
+//
+// Created with Android Studio.
+// User: 三帆
+// Date: 07/08/2019
+// Time: 08:40
+// email: sanfan.hx@alibaba-inc.com
+// tartget: 代码获取自: https://blog.csdn.net/O_time/article/details/86496537
+//
+import 'dart:async';
+import 'package:flutter/material.dart';
+
+// ignore: must_be_immutable
+class NetLoadingDialog extends StatefulWidget {
+  String loadingText;
+  bool outsideDismiss;
+  bool loading;
+  Function dismissCallback;
+  Future<dynamic> requestCallBack;
+
+  NetLoadingDialog(
+      {Key key,
+        this.loadingText = "loading...",
+        this.outsideDismiss = true,
+        this.dismissCallback,
+        this.loading,
+        this.requestCallBack})
+      : super(key: key);
+
+  @override
+  State<NetLoadingDialog> createState() => _LoadingDialog();
+}
+
+class _LoadingDialog extends State<NetLoadingDialog> {
+  _dismissDialog() {
+    if (widget.dismissCallback != null) {
+      widget.dismissCallback();
+    }
+    Navigator.of(context).pop();
+  }
+
+  @override
+  void initState() {
+    super.initState();
+    if (widget.requestCallBack != null) {
+      widget.requestCallBack.then((_) {
+        Navigator.pop(context);
+      });
+    }
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    if (!widget.loading) {
+      return Container();
+    }
+    return new GestureDetector(
+      onTap: widget.outsideDismiss ? _dismissDialog : null,
+      child: Material(
+        type: MaterialType.transparency,
+        child: new Center(
+          child: new SizedBox(
+            width: 120.0,
+            height: 120.0,
+            child: new Container(
+              decoration: ShapeDecoration(
+                shape: RoundedRectangleBorder(
+                  borderRadius: BorderRadius.all(
+                    Radius.circular(8.0),
+                  ),
+                ),
+              ),
+              child: new Column(
+                mainAxisAlignment: MainAxisAlignment.center,
+                crossAxisAlignment: CrossAxisAlignment.center,
+                children: <Widget>[
+                  new CircularProgressIndicator(),
+                  new Padding(
+                    padding: const EdgeInsets.only(
+                      top: 20.0,
+                    ),
+                    child: new Text(
+                      widget.loadingText,
+                      style: new TextStyle(fontSize: 12.0),
+                    ),
+                  ),
+                ],
+              ),
+            ),
+          ),
+        ),
+      ),
+    );
+  }
+}