/// <summary>
/// Constructor
/// </summary>
/// <param name="report">report document</param>
/// <param name="data">multiple report data</param>
/// <exception cref="ArgumentException">Need at least two ReportData objects</exception>
public MultipleReportPaginator(ReportDocument report, IEnumerable <ReportData> data)
{
if (data == null)
{
throw new ArgumentException("Need at least two ReportData objects");
}
// create a list of report paginators and compute page counts
_pageCount = 0;
int dataCount = 0;
foreach (ReportData rd in data)
{
if (rd == null)
{
continue;
}
ReportPaginator paginator = new ReportPaginator(report, rd);
_reportPaginators.Add(paginator);
DocumentPage dp = paginator.GetPage(0);
if ((dp != DocumentPage.Missing) && (dp.Size != Size.Empty))
{
_pageSize = paginator.PageSize;
}
_firstPages.Add(dp); // just cache the generated first page
_pageCount += paginator.PageCount;
dataCount++;
}
if ((_reportPaginators.Count <= 0) || (dataCount < 2))
{
throw new ArgumentException("Need at least two ReportData objects");
}
}
/// <summary>
/// Gets a document page of the appropriate generated report
/// </summary>
/// <param name="pageNumber">page number</param>
/// <returns>parsed DocumentPage</returns>
public override DocumentPage GetPage(int pageNumber)
{
// find the appropriate paginator for the page
int currentPage = 0;
int paginatorIndex = 0;
ReportPaginator pagePaginator = null;
foreach (ReportPaginator paginator in _reportPaginators)
{
int pageCount = paginator.PageCount;
if (pageNumber >= currentPage + pageCount)
{
currentPage += pageCount;
paginatorIndex++;
continue;
}
pagePaginator = paginator;
break;
}
if (pagePaginator == null)
{
return(DocumentPage.Missing);
}
DocumentPage dp;
if (pageNumber == 0)
{
dp = _firstPages[paginatorIndex];
}
else
{
dp = pagePaginator.GetPage(pageNumber - currentPage);
}
if (dp == DocumentPage.Missing)
{
return(DocumentPage.Missing);
}
_pageSize = dp.Size;
return(dp);
}