[syncfusion_flutter_datagrid] SfDataPager is slow when we have many pages

[tjuyou]

SfDataPager is slow when we have many pages, for example 5000 pages, it may take 10 seconds.

[East333]

There is same problems in my project.
if the initial pageCount <= 5，after update widget，the pager will slow when the pagecount is many,
because it build every page button, the element is too many!
and it will happen when the initial pageCount <=5

[Tamilarasan-Paranthaman]

Hi @tjuyou,

Based on the provided information, we are unable to reproduce the reported issue. We have tested the following sample with the 5000 pages and it’s working fine on our end.

Sample Link: https://www.syncfusion.com/downloads/support/directtrac/general/ze/main1866088306

Please check the above sample. If you are still facing the same issue, please provide the following details to check further.

• Provide a sample that is reproducible or modify the above sample as reproducible.
• The platform (Web/Android/Windows/macOS/iOS) on which you faced the issue.
• Flutter version which you have used.

It will be helpful for us to check on it and provide you with the solution at the earliest.

Regards,
Tamilarasan

[East333]

        FutureBuilder<double>(
          future: () async {
            await Future<void>.delayed(Duration(seconds: 1));
            return 100000.0;
          }(),
          builder: (context, snapshot) {
            switch (snapshot.connectionState) {
              case ConnectionState.none:
                return const Text('Press button to start');
              case ConnectionState.waiting:
                  return SfDataPager(
                    itemHeight: hiPagerItemHeight(),
                    itemWidth: hiPagerItemHeight(),
                    navigationItemHeight: hiPagerItemHeight(),
                    navigationItemWidth: hiPagerItemHeight(),
                    itemPadding: const EdgeInsets.all(2),
                    controller: dataPagerController,
                    availableRowsPerPage: Constants.instance.availableRowsPerPage,
                    delegate: saleOrderSourceView,
                    pageCount: 1,
                    direction: Axis.horizontal,
                    onRowsPerPageChanged: onRowsPerPageChanged,
                  );
              default: 
                if (snapshot.hasError) {
                  return Text('Error: ${snapshot.error}');
                } else {
                  return SfDataPager(
                    itemHeight: hiPagerItemHeight(),
                    itemWidth: hiPagerItemHeight(),
                    navigationItemHeight: hiPagerItemHeight(),
                    navigationItemWidth: hiPagerItemHeight(),
                    itemPadding: const EdgeInsets.all(2),
                    controller: dataPagerController,
                    availableRowsPerPage: Constants.instance.availableRowsPerPage,
                    delegate: saleOrderSourceView,
                    pageCount: snapshot.data!,
                    direction: Axis.horizontal,
                    onRowsPerPageChanged: onRowsPerPageChanged,
                  );
                }
            }
          },
        ),

If I use FutureBuilder or StatefulBuilder to change the pageCount by async way, the pager will build every page button

My platform is windows

[tjuyou]

Fixed in the latest version， thanks