commit

Author: zhujian1989

.idea/workspace.xml

@@ -1,9 +1,16 @@
-import 'package:redux/redux.dart';
+import 'package:flutter/material.dart';
 import 'package:flutter_study/widget/demo_simple_redux/count_redux.dart';
+import 'package:redux/redux.dart';
 
 class CountMiddleware extends MiddlewareClass<int> {
+
+  final GlobalKey<ScaffoldState> key;
+
+  CountMiddleware(this.key);
+
          call(Store<int> store, action, NextDispatcher next) {
            if(store.state == 0 && action == Actions.Reduce){
+             key.currentState.showSnackBar(new SnackBar(content: new Text('数字不能为负'))) ;
              return;
            }
            next(action);

lib/widget/demo_simple_redux/count_middleware.dart

@@ -7,14 +7,21 @@ import 'package:flutter_study/widget/demo_simple_redux/redux_w_test_b.dart';
 import 'package:flutter_study/widget/demo_simple_redux/redux_w_test_c.dart';
 import 'package:redux/redux.dart';
 
-final store = new Store<int>(counterReducer,  middleware: [new CountMiddleware()] ,initialState: 0);
+
 
 class CountReduxPage extends StatelessWidget {
+
+  static GlobalKey countKey = new GlobalKey<ScaffoldState>();
+
+  final store = new Store<int>(counterReducer,  middleware: [new CountMiddleware(countKey)] ,initialState: 0);
+
   @override
   Widget build(BuildContext context) {
+
     return new StoreProvider<int>(
       store: store,
       child: new Scaffold(
+        key: countKey,
         appBar: new AppBar(
           title: new Text('Simple Redux'),
         ),