pull_to_refresh 1.0.0

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

Pulltorefresh

Intro

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

Features

• pull up and pull down
• It's almost fit for all witgets,like GridView,ListView,Container,Text...
• High extensibility
• smart and flexible

How to use?

this is an example:

    new SmartRefresher(
            enablePulldownRefresh: true,
            enablePullUpLoad: true,
            headerBuilder: _buildHeader,
            refreshing: this.refreshing,
            headerHeight: 100.0,
            topVisibleRange: 100.0,
            loading: this.loading,
            child: new Container(
              //this is you content view
              child: new ListView(
                  physics: const NeverScrollableScrollPhysics(),
                  shrinkWrap: true,
                  itemExtent: 40.0,
                  children: _getDatas()
              ),
            ),
            onRefresh: _onRefresh,
            onLoadmore: _onLoadMore,
            onOffsetChange: _onOffsetCallback,
          )

You should set the indicator according to the different refresh mode. There are five refresh modes here:idel, startDrag, canRefresh, refreshing, complete, build footer is the same with that.

  Widget _buildHeader(context,mode){
    return new Image.asset("images/animate.gif",height: 100.0,fit: BoxFit.cover,);
  }

This refresh state requires you to update yourself in the logic code.

  void _onRefresh(){
    setState(() {
      refreshing = true;
    });
    //Simulation of a network request to obtain data
    new Future.delayed(const Duration(milliseconds: 2000),(){
      setState(() {
        refreshing = false;
      });
      print("Refreshed!!!");
    });

  }
  

• If your content view is a rolling component, such as ScrollView, ListView, GridView and so on, you assign these two attributes to the component.Because my parts are used in the ListView nested package

new ListView(){
    physics: const NeverScrollableScrollPhysics(),
    shrinkWrap: true,
    child:...
}

Attention point

• You should set the same indictor height for headerHeight and footerHeight.

/**

    the height is your headerContainer height
    Why do you want to set it this way?
    Look at the Exist problem.
*/


headerHeight:50.0,
footerHeight:50.0,

Existing problems

• I don't know how to calculate the height of the subcomponents ahead of time in the build method, for example: I want to get the height of the head indicator. I've been looking for a long time on the Google. I don't know how to solve this problem. If you have an idea, you can mention issue or pr. So I had better choose to pass in a value to the component, but increase the complexity.

• When the content View is less than the outside container, I don't know how to hide it when the View is loaded, because there is no construction complete callback method that can let me hide, or how I should get the height of the content View before the construction method.

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.