pull_to_refresh 1.1.6

a widget provided to the flutter scroll component drop-down refresh and pull up load.

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)

(Suspend maintenance until 12 months after the end of the postgraduate entrance examination.)

Features

• Android and iOS both spported
• pull up and pull down
• It's almost fit for all witgets,like GridView,ListView,Container...
• High extensibility,High degree of freedom
• powerful Bouncing

Screenshots

How to use?

1.the first declare following in your pubspec.yml

   dependencies:
     pull_to_refresh: ^1.1.6
     

2.and then,import that line,SmartRefresher is a component that is wrapped outside your content View

   import "package:pull_to_refresh/pull_to_refresh.dart";
   ....
   
   build() =>
   
    new SmartRefresher(
        enablePullDown: true,
        enablePullUp: true,
        onRefresh: _onRefresh,
        onOffsetChange: _onOffsetCallback,
        child: new ListView.builder(

                           itemExtent: 40.0,
                           itemCount: data.length,
                           itemBuilder: (context,index){
                             return data[index];
                           },

                         )
    )

3.You should set the indicator according to the different refresh mode.build footer is the same with that. Of course, I have built an indicator convenient to use, called ClassicIndicator. If I do not meet the requirements, I can choose to define an indicator myself.

  Widget _buildHeader(context,mode){
   return new ClassicIndicator(mode: mode);
  }
  
 
  Widget _buildFooter(context,mode){
    // the same with header
    ....
  }

  new SmartRefresher(
     ....
     footerBuilder: _buildFooter,
     headerBuilder: _buildHeader
  )

Whether at the top or bottom, the onRefresh will be callback when the indicator state is refreshed. But how can I tell the result to SmartRefresher? It's very simple. It provides a RefreshController inside, you can pass the construction of a controller to SmartRefresher, and then call.SendBack (int status) can change the state of success or failure.

    void _onRefresh(bool up){
		if(up){
		   //headerIndicator callback
		   new Future.delayed(const Duration(milliseconds: 2009))
                               .then((val) {
                                 _refreshController.sendBack(true, RefreshStatus.failed);
                           });
		   
		}
		else{
			//footerIndicator Callback
		}
    }

  

Props Table

SmartRefresher:

Attribute Name	Attribute Explain	Parameter Type	Default Value	requirement
child	your content View	? extends ScrollView	null	necessary
headerBuilder	the header indictor	(BuildContext,int) => Widget	null	if enablePullDown is necessary,else option
footerBuilder	the footer indictor	(BuildContext,int) => Widget	null	if enablePullUp is necessary,else option
enablePullDown	switch of the pull down	boolean	true	optional
enablePullUp	switch of the pull up	boolean	false	optional
onRefresh	will callback when the one indicator is getting refreshing	(bool) => Void	null	optional
onOffsetChange	callback while you dragging and outOfrange	(bool,double) => Void	null	optional
controller	controll inner some states	RefreshController	null	optional
headerConfig	This setting will affect which type of indicator you use and config contains a lot props,such as triigerDistance,completedurtion...	Config	RefreshConfig	optional
footerConfig	This setting will affect which type of indicator you use and config contains a lot props,such as triigerDistance,completedurtion...	Config	LoadConfig	optional
enableOverScroll	the switch of Overscroll,When you use RefreshIndicator(Material), you may have to shut down.	bool	true	optional

RefreshConfig:

Attribute Name	Attribute Explain	Default Value
triggerDistance	Drag distance to trigger refresh	100.0
completeDuration	Stay in time when you return to success and failure	800
visibleRange	The scope of the indicator can be seen(refresh state)	50.0

LoadConfig:

Attribute Name	Attribute Explain	Default Value
triggerDistance	Drag distance to trigger loading	5.0
autoLoad	enable open Auto Load,If false triggerDistance is invalid	true
bottomWhenBuild	Is it at the bottom of listView when it is loaded(When your header is LoadConfig)	true

FAQ

• Does it support simple RefreshIndicator (material) + pull up loading and no elastic refresh combination?
  

  Yes, as long as you set the node properties enableOverScroll = false, enablePullDown = false, it's OK to wrap a single RefreshIndicator outside, and [Example4](https://github.com/peng8350/flutter_pulltorefresh/blob/master/example/lib/ui/Example3.dart) has given an example in demo.

• Does it support an indicator that does not follow the list?
  

  This I did not package in the library, because even if I encapsulated, it would only make the logic complexity of the code increased, so you need yourself to use the onOffsetChange callback method to implement it. It is not difficult to use Stack to encapsulate it. It can refer to the idea of [Example3](https://github.com/peng8350/flutter_pulltorefresh/blob/master/example/lib/ui/Example3.dart) or my project [flutter_gank](https://github.com/peng8350/flutter_gank).

• Why does child attribute extend from original widget to scrollView?
  

  Because of my negligence, I didn't take into account the problem that child needed to cache the item, so the 1.1.3 version had corrected the problem of not caching.

• What impact does this library have on performance?
  

  No, although I did not actually use data to test performance problems, I did not appear to pull up or pull down the sliding carton situation in the process of another project development.

• Is there any way to achieve the maximum distance to limit springback?
  

  The answer is negative. I know that it must be done by modifying the ScrollPhysics, but I am not quite sure about the Api in it, but I failed. If you have a way to solve this problem, please come to a PR

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
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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
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.