public PageOfResults(List <T> items, int pageNum, int numPages)
{
if (items == null)
{
items = new List <T>();
}
this.AddRange(items);
Stats = new PageResultStats(pageNum, numPages);
}
/// <summary>
/// Builds a generic list of Page selection options based on current page, total number of pages,
/// and pageBloom, which is the number of pages on each side of current page to generate.
/// For example, if you are on page 3 with a bloom of 2, 5 page options will be generated like such: 1 2 current 4 5
/// </summary>
/// <param name="stats">the current stats (page number and total pages)</param>
/// <param name="pageBloom">the number of pages to buffer on each side of the current page. (must be 1 or more)</param>
/// <returns>IEnumerable<PageSelectOption> of generic page selection options</returns>
public static IEnumerable <PageSelectOption> BuildOpts(PageResultStats stats, int pageBloom, Func <int, string> pageLinkBuilder)
{
string link;
if (pageBloom < 0) // handle negative bloom as no bloom
{
pageBloom = 0;
}
// add first page entry, but only if first page isn't current or in pre-bloom
if (stats.CurrPageNumber > 1 && stats.CurrPageNumber - pageBloom > 1)
{
link = (pageLinkBuilder == null) ? string.Empty : pageLinkBuilder(1);
yield return(new PageSelectOption(1.ToString(), link, 1, false));
}
// add pre-bloom options (pages prior to current page)
for (int z = stats.CurrPageNumber - pageBloom; z < stats.CurrPageNumber; z++)
{
if (z >= 1) // pages must be 1 or more
{
link = (pageLinkBuilder == null) ? string.Empty : pageLinkBuilder(z);
yield return(new PageSelectOption(z.ToString(), link, z, false));
}
}
// add current page
link = (pageLinkBuilder == null) ? string.Empty : pageLinkBuilder(stats.CurrPageNumber);
yield return(new PageSelectOption(stats.CurrPageNumber.ToString(), link, stats.CurrPageNumber, true));
// process post bloom options (pages after current page)
for (int z = stats.CurrPageNumber + 1; z <= stats.CurrPageNumber + pageBloom; z++)
{
if (z <= stats.NumPages) // pages must in a valid range
{
link = (pageLinkBuilder == null) ? string.Empty : pageLinkBuilder(z);
yield return(new PageSelectOption(z.ToString(), link, z, false));
}
}
// add last page, but only if last page isn't current or in post-bloom
if (stats.NumPages > stats.CurrPageNumber && stats.NumPages > stats.CurrPageNumber + pageBloom)
{
link = (pageLinkBuilder == null) ? string.Empty : pageLinkBuilder(stats.NumPages);
yield return(new PageSelectOption(stats.NumPages.ToString(), link, stats.NumPages, false));
}
}