pull_to_refresh 1.3.5

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)

Features

• Android and iOS both supported
• pull up and pull down
• It's almost fit for all Scroll witgets,like GridView,ListView...
• High extensibility,High degree of freedom
• powerful Bouncing
• support reverse ScrollView
• provide more refreshStyle: Behind,Follow,UnFollow

ScreenShots

Four RefreshStyle

Style	Follow	nFollow
art	[]	[]

Style	Behind	Front
art	[]	[]

Indicator

Style	Classical(Follow,UnFollow)	QQ WaterDrop
art	[]	[]

Style	flutter RefreshIndicator	WaterDropMaterial(Front)
art	[]	[]

How to use?

   dependencies:
     pull_to_refresh: ^1.3.5

RefreshController _refreshController;

initState(){

    super.initState();
    _refreshController = RefreshController();
    // if you need refreshing when init
   // _refreshController.requestRefresh();
}

void _onRefresh(){

   /*.  after the data return,
        use _refreshController.refreshComplete() or refreshFailed() to end refreshing
   */
}

void _onLoading(){
   /*
        use _refreshController.loadComplete() or loadNoData() to end loading
   */
}

build(){
...
SmartRefresher(
      enablePullDown: true,
      enablePullUp: true,
      header: WaterDropHeader(),
      controller: _refreshController,
      onRefresh: _onRefresh,
      onLoading: _onLoading,
      child: "yourContentScrollView",
    )
....
}

// don't forget to dispose refreshController
void dispose(){
    _refreshController.dispose();
    super.dispose();
}

Custom

1.In the first way, assuming that the indicator function you want to implement is not too complex, you can use CustomHeader or CustomFooter. using onOffsetChange callback in SmartRefresher to implements some simple animation.

   Widget buildHeader(BuildContext context,RefreshStatus mode){
      .....
   }

   SmartRefresher(
      ...
      header: CustomHeader(builder:buildHeader)

      ...
   )

2.The second way is by integrating RefreshInditor or Load Indicator, for detailed reference ClassicIndicator

Props Table

SmartRefresher:

Attribute Name	Attribute Explain	Parameter Type	Default Value	requirement
controller	controll inner some states	RefreshController	null	necessary
child	your content View	? extends ScrollView	null	necessary
header	the header indictor	RefreshIndicator	ClassicHeader	optional
footer	the footer indictor	LoadIndicator	ClassicFooter	optional
enablePullDown	switch of the pull down	boolean	true	optional
enablePullUp	switch of the pull up	boolean	false	optional
onRefresh	will callback when the header indicator is getting refreshing	() => Void	null	optional
onLoad	will callback when the footer indicator is getting loading	() => Void	null	optional
onOffsetChange	callback while you dragging and outOfrange	(bool,double) => Void	null	optional
isNestWrapped	it will set true when SmartRefresher is wrapped by NestedScrollView	bool	false	optional

Frequent problems

• IOS Status Bar Double-click Why ListView does not automatically scroll to the top?

  This problem is not my encapsulation error after testing. When the controller in ListView is replaced, this problem will occur, probably because of the processing operation in Scaffold.,please issue flutter。

• How to use it with NestedScrollView?

  1.3.0 provides a new attribute isNestWrapped for compatibility. Note that when this attribute is opened, scollController depends on NestScrollView, internally via PrimaryScrollController. of (context) To get scrollController, scrollController is placed in NestedScrollView。

• Why is there a empty space in the top or tail indicator after using CuperNavigationBar (not just in this case)?

  the reason may be SafeArea,the solution: wrap SmartRefresher in SafeArea

• 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.

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.