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Description:

pull to refresh plus

flutter_pulltorefresh #

Intro #
a widget provided to the flutter scroll component drop-down refresh and pull up load.support android and ios.
If you are Chinese,click here(中文文档)
Features #

pull up load and pull down refresh
It's almost fit for all Scroll witgets,like GridView,ListView...
provide global setting of default indicator and property
provide some most common indicators
Support Android and iOS default ScrollPhysics,the overScroll distance can be controlled,custom spring animate,damping,speed.
horizontal and vertical refresh,support reverse ScrollView also(four direction)
provide more refreshStyle: Behind,Follow,UnFollow,Front,provide more loadmore style
Support twoLevel refresh,implments just like TaoBao twoLevel,Wechat TwoLevel
enable link indicator which placing other place,just like Wechat FriendCircle refresh effect

Usage #
add this line to pubspec.yaml

dependencies:

pull_to_refresh_plus: ^2.0.2

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import package

import 'package: pull_to_refresh_plus/pull_to_refresh_plus.dart';

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simple example,It must be noted here that ListView must be the child of SmartRefresher and cannot be separated from it. For detailed reasons, see here

List<String> items = ["1", "2", "3", "4", "5", "6", "7", "8"];
RefreshController _refreshController =
RefreshController(initialRefresh: false);

void _onRefresh() async{
// monitor network fetch
await Future.delayed(Duration(milliseconds: 1000));
// if failed,use refreshFailed()
_refreshController.refreshCompleted();
}

void _onLoading() async{
// monitor network fetch
await Future.delayed(Duration(milliseconds: 1000));
// if failed,use loadFailed(),if no data return,use LoadNodata()
items.add((items.length+1).toString());
if(mounted)
setState(() {

});
_refreshController.loadComplete();
}

@override
Widget build(BuildContext context) {
return Scaffold(
body: SmartRefresher(
enablePullDown: true,
enablePullUp: true,
header: WaterDropHeader(),
footer: CustomFooter(
builder: (BuildContext context,LoadStatus mode){
Widget body ;
if(mode==LoadStatus.idle){
body = Text("pull up load");
}
else if(mode==LoadStatus.loading){
body = CupertinoActivityIndicator();
}
else if(mode == LoadStatus.failed){
body = Text("Load Failed!Click retry!");
}
else if(mode == LoadStatus.canLoading){
body = Text("release to load more");
}
else{
body = Text("No more Data");
}
return Container(
height: 55.0,
child: Center(child:body),
);
},
),
controller: _refreshController,
onRefresh: _onRefresh,
onLoading: _onLoading,
child: ListView.builder(
itemBuilder: (c, i) => Card(child: Center(child: Text(items[i]))),
itemExtent: 100.0,
itemCount: items.length,
),
),
);
}

// from 1.5.0, it is not necessary to add this line
//@override
// void dispose() {
// TODO: implement dispose
// _refreshController.dispose();
// super.dispose();
// }

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The global configuration RefreshConfiguration, which configures all Smart Refresher representations under the subtree, is generally stored at the root of MaterialApp and is similar in usage to ScrollConfiguration.
In addition, if one of your SmartRefresher behaves differently from the rest of the world, you can use RefreshConfiguration.copyAncestor() to copy attributes from your ancestor RefreshConfiguration and replace
attributes that are not empty.
// Smart Refresher under the global configuration subtree, here are a few particularly important attributes
RefreshConfiguration(
headerBuilder: () => WaterDropHeader(), // Configure the default header indicator. If you have the same header indicator for each page, you need to set this
footerBuilder: () => ClassicFooter(), // Configure default bottom indicator
headerTriggerDistance: 80.0, // header trigger refresh trigger distance
springDescription:SpringDescription(stiffness: 170, damping: 16, mass: 1.9), // custom spring back animate,the props meaning see the flutter api
maxOverScrollExtent :100, //The maximum dragging range of the head. Set this property if a rush out of the view area occurs
maxUnderScrollExtent:0, // Maximum dragging range at the bottom
enableScrollWhenRefreshCompleted: true, //This property is incompatible with PageView and TabBarView. If you need TabBarView to slide left and right, you need to set it to true.
enableLoadingWhenFailed : true, //In the case of load failure, users can still trigger more loads by gesture pull-up.
hideFooterWhenNotFull: false, // Disable pull-up to load more functionality when Viewport is less than one screen
enableBallisticLoad: true, // trigger load more by BallisticScrollActivity
child: MaterialApp(
........
)
);

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1.5.6 add new feather: localization ,you can add following code in MaterialApp or CupertinoApp:

MaterialApp(
localizationsDelegates: [
// this line is important
RefreshLocalizations.delegate,
GlobalWidgetsLocalizations.delegate,
GlobalMaterialLocalizations.delegate
],
supportedLocales: [
const Locale('en'),
const Locale('zh'),
],
localeResolutionCallback:
(Locale locale, Iterable<Locale> supportedLocales) {
//print("change language");
return locale;
},
)

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ScreenShots #
Examples #

Style
basic
header in other place
reverse + horizontal

Style
twoLevel
use with other widgets
chat

Style
simple custom header(使用SpinKit)
dragableScrollSheet+LoadMore
Gif Indicator

Indicator #
各种指示器 #

refresh style

pull up load style

RefreshStyle.Follow
RefreshStyle.UnFollow
LoadStyle.ShowAlways
LoadStyle.HideAlways

RefreshStyle.Behind
RefreshStyle.Front
LoadStyle.ShowWhenLoading

Style
ClassicIndicator
WaterDropHeader
MaterialClassicHeader

Style
WaterDropMaterialHeader
Shimmer Indicator
Bezier+Circle

about SmartRefresher's child explain #
Since 1.4.3, the child attribute has changed from ScrollView to Widget, but this does not mean that all widgets are processed the same. SmartRefresher's internal implementation mechanism is not like NestedScrollView
There are two main types of processing mechanisms here, the first categoryis the component inherited from ScrollView. At present, there are only three types,
ListView, GridView, CustomScrollView. The second category is components that are not inherited from ScrollView, which generally put empty views,
NoScrollable views (NoScrollable convert Scrollable), PageView, and you don't need to estimate height by LayoutBuilder yourself.

For the first type of mechanism, slivers are taken out of the system "illegally". The second is to put children directly into classes such as `SliverToBox Adapter'. By splicing headers and footers back and forth to form slivers, and then putting slivers inside Smart Refresher into CustomScrollView, you can understand Smart Refresher as CustomScrollView,
because the inside is to return to CustomScrollView. So, there's a big difference between a child node and a ScrollView.

Now, guess you have a requirement: you need to add background, scrollbars or something outside ScrollView. Here's a demonstration of errors and correct practices

//error
SmartRefresher(
child: ScrollBar(
child: ListView(
....
)
)
)

// right
ScrollBar(
child: SmartRefresher(
child: ListView(
....
)
)
)

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Demonstrate another wrong doing,put ScrollView in another widget

//error
SmartRefresher(
child:MainView()
)

class MainView extends StatelessWidget{
Widget build(){
return ListView(
....
);
}

}

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The above mistake led to scrollable nesting another scrollable, causing you to not see the header and footer no matter how slippery you are.
Similarly, you may need to work with components like NotificationListener, ScrollConfiguration..., remember, don't store them outside ScrollView (you want to add refresh parts) and Smart Refresher memory.。
More #

Property Document or Api/Doc
Custom Indicator
Inner Attribute Of Indicators
Update Log
Notice
FAQ

Exist Problems #

about NestedScrollView,When you slide down and then slide up quickly, it will return back. The main reason is that
NestedScrollView does not consider the problem of cross-border elasticity under
bouncingScrollPhysics. Relevant flutter issues: 34316, 33367, 29264. This problem
can only wait for flutter to fix this.
SmartRefresher does not have refresh injection into ScrollView under the subtree, that is, if you put AnimatedList or RecordableListView in the child
is impossible. I have tried many ways to solve this problem and failed. Because of the
principle of implementation, I have to append it to the head and tail of slivers. In fact, the problem is not that much of my
Component issues, such as AnimatedList, can't be used with AnimatedList and GridView unless
I convert AnimatedList to SliverAnimatedList is the solution. At the moment,
I have a temporary solution to this problem, but it's a bit cumbersome to rewrite the code inside it and then outside ScrollView.
Add SmartRefresher, see my two examples Example 1和Example 2

Thanks #
SmartRefreshLayout
LICENSE #

MIT License

Copyright (c) 2018 Jpeng

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

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