public static MvcHtmlString Pager(this HtmlHelper html, int currentPage, int pageSize, int totalRows, Func<int, string> url, PagerSettings settings)
{
int blockSize = settings.PagesRangeSize;
var pagesCount = (int)Math.Ceiling((double)totalRows / pageSize);
var blocksCount = (int)Math.Ceiling((double)pagesCount / blockSize);
var currentBlock = 0;
for (var i = 0; i < blocksCount; i++)
{
var floor = i * blockSize + 1;
var ceil = (i + 1) * blockSize;
if ((currentPage < floor) || (currentPage > ceil)) continue;
currentBlock = i;
break;
}
var startPage = currentBlock * blockSize + 1; //first visible page
var endPage = (startPage + blockSize - 1); //last visible page
if (endPage > pagesCount)
{
endPage = pagesCount;
}
StringBuilder sb = new StringBuilder(1024);
//sb.AppendFormat("<span class=\"text\">{0}: </span>", settings.Pages);
//first page, prev page)
if (currentPage > 1)
{
sb.Append(RenderLink(url(1), settings.FirstPage));
sb.Append(RenderLink(url(currentPage - 1), settings.PrevPage));
}
//previous dots
if (startPage > 1) //first page not visible
{
int prevPage = startPage - 1;
sb.Append(RenderLink(url(prevPage), "..."));
}
//pages links
for (int i = startPage; i <= endPage; i++)
{
//if (currentPage == i)
//{
// sb.AppendFormat("<span class=\"pager-item\">{0}</span>", i);
//}
//else
//{
// sb.Append(RenderLink(url(i), i.ToString()));
//}
sb.Append(RenderLink(url(i), i.ToString(), currentPage == i));
}
//final dots
if (endPage < pagesCount) //last page not visible
{
int nextPage = endPage + 1;
sb.Append(RenderLink(url(nextPage), "..."));
}
//next page, last page
if (currentPage < pagesCount)
{
sb.Append(RenderLink(url(currentPage + 1), settings.NextPage));
sb.Append(RenderLink(url(pagesCount), settings.LastPage));
}
return MvcHtmlString.Create("<ul class='pagination'>" + sb + "</ul>");
}
public static MvcHtmlString Pager(this HtmlHelper html, IPageableViewModel model, PagerSettings settings)
{
return Pager(html, model.Page, model.PageSize, model.TotalRows, x => GetDefaultPageUrl(x), settings);
}