pull to pulltorefreshnotification

flutter plugin for building pull to refresh effects with pulltorefreshnotification and pulltorefreshcontainer quickly.

sample 1 appbar

build appbar to pull to refresh with pulltorefreshcontainer

   widget build(buildcontext context) {
 return pulltorefreshnotification(
      color: colors.blue,
      pullbackonrefresh: true,
      onrefresh: onrefresh,
      child: customscrollview(
        slivers: <widget>[
          pulltorefreshcontainer(buildpulltorefreshappbar),
          sliverlist(
              delegate:
                  sliverchildbuilderdelegate((buildcontext context, int index) {
            return container(
                padding: edgeinsets.only(bottom: 4.0),
                child: column(
                  children: <widget>[
                    text(
                      "list item : ${listlength - index}",
                      style: textstyle(fontsize: 15.0, inherit: false),
                    ),
                    divider(
                      color: colors.grey,
                      height: 2.0,
                    )
                  ],
                ));
          }, childcount: listlength)),
        ],
      ),
    );
}
    
     widget buildpulltorefreshappbar(pulltorefreshscrollnotificationinfo info) {
        print(info?.mode);
        print(info?.dragoffset);
    //    print("------------");
        var action = padding(
          child: info?.refreshwiget ?? icon(icons.more_horiz),
          padding: edgeinsets.all(15.0),
        );
        var offset = info?.dragoffset ?? 0.0;
    //    var mode = info?.mode;
    //    if (mode != null && mode == refreshindicatormode.done) {
    //      //showtoast("refresh done");
    //    }
        return sliverappbar(
            pinned: true,
            title: text("pulltorefreshappbar"),
            centertitle: true,
            expandedheight: 200.0 + offset,
            actions: <widget>[action],
            flexiblespace: flexiblespacebar(
                //centertitle: true,
                title: text(
                  info?.mode?.tostring() ?? "",
                  style: textstyle(fontsize: 10.0),
                ),
                collapsemode: collapsemode.pin,
                background: image.asset(
                  "assets/467141054.jpg",
                  //fit: offset > 0.0 ? boxfit.cover : boxfit.fill,
                  fit: boxfit.cover,
                )));
      }

sample 2 header

build header to pull to refresh with pulltorefreshcontainer.
and you can easy to handle the status in pulling.

  widget build(buildcontext context) {
    return pulltorefreshnotification(
       color: colors.blue,
       onrefresh: onrefresh,
       maxdragoffset: 80.0,
       child: customscrollview(
         slivers: <widget>[
           sliverappbar(
             pinned: true,
             title: text("pulltorefreshheader"),
           ),
           pulltorefreshcontainer(buildpulltorefreshheader),
           sliverlist(
               delegate:
                   sliverchildbuilderdelegate((buildcontext context, int index) {
             return container(
                 padding: edgeinsets.only(bottom: 4.0),
                 child: column(
                   children: <widget>[
                     text(
                       "list item : ${listlength - index}",
                       style: textstyle(fontsize: 15.0, inherit: false),
                     ),
                     divider(
                       color: colors.grey,
                       height: 2.0,
                     )
                   ],
                 ));
           }, childcount: listlength)),
         ],
       ),
     );
   }
 
   widget buildpulltorefreshheader(pulltorefreshscrollnotificationinfo info) {
     //print(info?.mode);
     //print(info?.dragoffset);
 //    print("------------");
     var offset = info?.dragoffset ?? 0.0;
     var mode = info?.mode;
     widget refreshwiget = container();
     //it should more than 18, so that refreshprogressindicator can be shown fully
     if (info?.refreshwiget != null &&
         offset > 18.0 &&
         mode != refreshindicatormode.error) {
       refreshwiget = info.refreshwiget;
     }
 
     widget child = null;
     if (mode == refreshindicatormode.error) {
       child = gesturedetector(
           ontap: () {
             // refreshnotification;
             info?.pulltorefreshnotificationstate?.show();
           },
           child: container(
             color: colors.grey,
             alignment: alignment.bottomcenter,
             height: offset,
             width: double.infinity,
             //padding: edgeinsets.only(top: offset),
             child: container(
               padding: edgeinsets.only(left: 5.0),
               alignment: alignment.center,
               child: text(
                 mode?.tostring() + "  click to retry" ?? "",
                 style: textstyle(fontsize: 12.0, inherit: false),
               ),
             ),
           ));
     } else {
       child = container(
         color: colors.grey,
         alignment: alignment.bottomcenter,
         height: offset,
         width: double.infinity,
         //padding: edgeinsets.only(top: offset),
         child: row(
           mainaxisalignment: mainaxisalignment.center,
           children: <widget>[
             refreshwiget,
             container(
               padding: edgeinsets.only(left: 5.0),
               alignment: alignment.center,
               child: text(
                 mode?.tostring() ?? "",
                 style: textstyle(fontsize: 12.0, inherit: false),
               ),
             )
           ],
         ),
       );
     }
 
     return slivertoboxadapter(
       child: child,
     );
   }
 
   bool success = false;
   future<bool> onrefresh() {
     final completer<bool> completer = new completer<bool>();
     new timer(const duration(seconds: 2), () {
       completer.complete(success);
       success = true;
     });
     return completer.future.then((bool success) {
       if (success) {
         setstate(() {
           listlength += 10;
         });
       }
       return success;
     });
   }

sample 3 image

build zoom image to pull to refresh with using pulltorefreshcontainer.

 widget build(buildcontext context) {
     // todo: implement build
     return pulltorefreshnotification(
       color: colors.blue,
       pullbackonrefresh: true,
       onrefresh: onrefresh,
       child: customscrollview(
         slivers: <widget>[
           sliverappbar(
             title: text("pulltorefreshimage"),
           ),
           pulltorefreshcontainer(buildpulltorefreshimage),
           sliverlist(
               delegate:
                   sliverchildbuilderdelegate((buildcontext context, int index) {
             return container(
                 padding: edgeinsets.only(bottom: 4.0),
                 child: column(
                   children: <widget>[
                     text(
                       "list item : ${listlength - index}",
                       style: textstyle(fontsize: 15.0, inherit: false),
                     ),
                     divider(
                       color: colors.grey,
                       height: 2.0,
                     )
                   ],
                 ));
           }, childcount: listlength)),
         ],
       ),
     );
   }
   
   widget buildpulltorefreshimage(pulltorefreshscrollnotificationinfo info) {
     print(info?.mode);
     print(info?.dragoffset);
 //    print("------------");
     var offset = info?.dragoffset ?? 0.0;
     widget refreshwiget = container();
     if (info?.refreshwiget != null) {
       refreshwiget = material(
         type: materialtype.circle,
         color: theme.of(context).canvascolor,
         elevation: 2.0,
         child: padding(
           padding: edgeinsets.all(12),
           child: info.refreshwiget,
         ),
       );
     }
 
     return slivertoboxadapter(
       child: stack(
         alignment: alignment.center,
         children: <widget>[
           container(
               height: 200.0 + offset,
               width: double.infinity,
               child: image.asset(
                 "assets/467141054.jpg",
                 //fit: offset > 0.0 ? boxfit.cover : boxfit.fill,
                 fit: boxfit.cover,
               )),
           center(
             child: row(
               mainaxisalignment: mainaxisalignment.center,
               children: <widget>[
                 refreshwiget,
                 container(
                   padding: edgeinsets.only(left: 5.0),
                   alignment: alignment.center,
                   child: text(
                     info?.mode?.tostring() ?? "",
                     style: textstyle(fontsize: 12.0, inherit: false),
                   ),
                 )
               ],
             ),
           )
         ],
       ),
     );
   }

please see the example app of this for a full example.