bencripps / react-redux-grid

export const getCurrentRecords = (

    dataSource,

    pageIndex,

    pageSize,

    infinite,

    viewableIndex,

    viewableCount,

    bufferMultiplier

) => {

    if (!dataSource) {

        return {};

    }

    if (infinite) {

        const start = Math.max(

            viewableIndex - viewableCount * bufferMultiplier,

            0

        );

        const end = Math.min(

            viewableIndex + viewableCount * (bufferMultiplier + 1),

            dataSource.currentRecords.count()

        );

        return {

            data: dataSource.currentRecords.slice(start, end),

            startIndex: start,

            endIndex: end

        };

    }

    return {

        data: dataSource.data.slice(

            pageIndex * pageSize, (pageIndex + 1) * pageSize

        ),

        startIndex: null,

        endIndex: null

    };

};