public PagingViewModel Generate(string pagingId, PagingStatus pagingStatus, PageRequestWithSort request)
{
if (pagingStatus == null)
{
return new PagingViewModel {
NoItems = true
}
}
;
int itemCount = pagingStatus.TotalItems;
if (itemCount == 0)
{
return new PagingViewModel {
NoItems = true
}
}
;
int pageCount = itemCount / pagingStatus.PageSize;
if (itemCount % pagingStatus.PageSize > 0)
{
pageCount++;
}
int selectedPage = Math.Max(1, Math.Min(pagingStatus.PageNumber, pageCount));
int firstPageSelector;
if (selectedPage <= PagingConfiguration.PageSelectorCount / 2) //if the selected page is before the middle of the visible selectors
{
firstPageSelector = 1;
}
else if (pageCount - selectedPage <= PagingConfiguration.PageSelectorCount / 2) //if the selected page is after the middle of the visible selectors
{
firstPageSelector = Math.Max(1, pageCount - PagingConfiguration.PageSelectorCount + 1);
}
else
{
firstPageSelector = selectedPage - (PagingConfiguration.PageSelectorCount / 2); //else - the selected page is in the middle
}
int lastPageSelector = Math.Min(firstPageSelector + PagingConfiguration.PageSelectorCount - 1, pageCount);
//int firstItemIndex = pagingStatus.PageSize * (selectedPage - 1);
//int itemsOnSelectedPage = Math.Min(pagingStatus.PageSize, itemCount - firstItemIndex);
var ret = new PagingViewModel
{
PageSize = pagingStatus.PageSize,
AltPageSize = null,
CurrentPage = selectedPage,
LastPage = pageCount,
PageSelectors = Enumerable.Range(firstPageSelector, lastPageSelector - firstPageSelector + 1).Select(
i => new PageSelector
{
Current = i == selectedPage,
PageId = i,
PrependEllipsis = i == firstPageSelector && i > 2
}),
PagingId = pagingId,
FirstItem = pagingStatus.FirstItem,
LastItem = pagingStatus.LastItem,
TotalItems = pagingStatus.TotalItems,
PageSizes = PagingConfiguration.PageSizes.Select(size => new SelectListItem {
Selected = size == pagingStatus.PageSize, Text = size.ToString(), Value = size.ToString()
})
};
if (firstPageSelector > 1)
{
ret.PageSelectors = new[]
{
new PageSelector
{
Current = false,
PageId = 1,
PrependEllipsis = false
}
}.Union(ret.PageSelectors);
}
if (ret.LastPage > lastPageSelector)
{
ret.PageSelectors =
ret.PageSelectors.Union(new[]
{
new PageSelector
{
Current = pageCount == selectedPage,
PageId = pageCount,
PrependEllipsis = pageCount > lastPageSelector + 1
}
});
}
ExtraViewModelBuilding(ret, request);
return(ret);
}
protected virtual void ExtraViewModelBuilding(PagingViewModel paginationViewModel, PageRequestWithSort request)
{
}