增加loading状态

lib/NewMessageModel/page/AttentionModel.dart

@@ -15,7 +15,7 @@ class AttentionModel extends BaseModel {
 
   AttentionModel(this.page, this.fromPage);
 
-  init(BuildContext context) {
+  init(BuildContext context, {Function callback}) {
     // 初始化或者刷新的时候增加一项无用项，用来渲染列表title
     if (page == 1) {
       Data firstData = Data();
@@ -32,6 +32,9 @@ class AttentionModel extends BaseModel {
         _newList.addAll(value.data);
         value.data = _newList;
         zzgLive.notifyView(value);
+        if (callback is Function) {
+          callback();
+        }
       }
     }).onError((error) {
       Toast.show(context, "${error.toString()}");
@@ -45,9 +48,9 @@ class AttentionModel extends BaseModel {
     init(context);
   }
 
-  more(BuildContext context) {
+  more(BuildContext context, Function fun) {
     page++;
-    init(context);
+    init(context, callback: fun);
   }
 
   @override

lib/NewMessageModel/page/AttentionPage.dart

@@ -6,6 +6,15 @@ import 'package:gmalpha_flutter/NewMessageModel/service/remote/entity/AttentionE
 import 'package:gmalpha_flutter/commonModel/base/BasePage.dart';
 import 'package:gmalpha_flutter/commonModel/ui/ALColors.dart';
 
+enum LoadStatus {
+  // 正在加载
+  LOADING,
+  // 加载完成
+  COMPLETE,
+  // 初始状态
+  INITIAL
+}
+
 class AttentionPage extends StatefulWidget {
   final AttentionModel _model;
   AttentionPage(String fromPage) : _model = AttentionModel(1, fromPage);
@@ -14,6 +23,7 @@ class AttentionPage extends StatefulWidget {
 }
 
 class _AttentionPageState extends BasePage<AttentionPage> {
+  LoadStatus loadStatus = LoadStatus.INITIAL;
   List<Data> _noticeLists = [];
   bool noData = false;
   AttentionModel _model;
@@ -29,6 +39,7 @@ class _AttentionPageState extends BasePage<AttentionPage> {
     _noticeLists = [];
     _scrollController.jumpTo(0);
     _model.refresh(context);
+    loadStatus = LoadStatus.INITIAL;
   }
 
   @override
@@ -40,11 +51,20 @@ class _AttentionPageState extends BasePage<AttentionPage> {
       if (noData == false
                  && _scrollController.position.pixels
                  == _scrollController.position.maxScrollExtent) {
-        _model.more(context);
+        setState(() {
+          loadStatus = LoadStatus.LOADING;
+        });
+        _model.more(context, loadComplete);
       }
     });
   }
 
+  void loadComplete() {
+    setState(() {
+      loadStatus = LoadStatus.COMPLETE;
+    });
+  }
+
   @override
   String pageName() {
     return 'notice_list';
@@ -93,10 +113,10 @@ class _AttentionPageState extends BasePage<AttentionPage> {
   }
 
   Widget _buildProgressIndicator() {
-    return Container(
-      color: Color(0xFFF4F3F8),
-      child: Padding(
-        padding: const EdgeInsets.all(20.0),
+    return Opacity(
+      opacity: loadStatus == LoadStatus.LOADING ? 1.0 : 0.0,
+      child: Container(
+        color: Color(0xFFF4F3F8),
         child: Row(
           mainAxisAlignment: MainAxisAlignment.center,
           crossAxisAlignment: CrossAxisAlignment.center,
@@ -107,7 +127,7 @@ class _AttentionPageState extends BasePage<AttentionPage> {
               child: CircularProgressIndicator(strokeWidth: 2.0),
             ),
             Padding(
-              padding: const EdgeInsets.only(left: 6.0),
+              padding: const EdgeInsets.only(left: 6.0, top: 20.0, bottom: 20.0),
               child: Text(
                 '加载中...',
                 style: TextStyle(