public static int PageCount(this IPaginatedMenu menu)
{
Ensure.That(menu, nameof(menu)).IsNotNull();
var size = menu.PageSize;
return(size == 0 ? 0 : Math.Max(0, menu.ItemCount - 1) / menu.PageSize + 1);
}
public IMenu Execute(params string[] args)
{
IPaginatedMenu menu = (IPaginatedMenu)this.session.CurrentMenu;
menu.ChangePage(true);
return(menu);
}
public static void Next(this IPaginatedMenu menu)
{
Ensure.That(menu, nameof(menu)).IsNotNull();
var lastPage = menu.PageSize == 0
? 0
: (int)Math.Floor(Math.Abs(menu.ItemCount - 0.5f) / menu.PageSize);
menu.Page = Math.Min(lastPage, menu.Page + 1);
}
public IMenu Execute(params string[] args)
{
IPaginatedMenu currentMenu = (IPaginatedMenu)this.session.CurrentMenu;
if (currentMenu is IPaginatedMenu paginatedMenu)
{
paginatedMenu.ChangePage();
}
return(currentMenu);
}
public static void Previous(this IPaginatedMenu menu)
{
Ensure.That(menu, nameof(menu)).IsNotNull();
menu.Page = Math.Max(0, menu.Page - 1);
}
public static void First(this IPaginatedMenu menu)
{
Ensure.That(menu, nameof(menu)).IsNotNull();
menu.Page = 0;
}
