protected virtual async Task Run(IMenu menu, IEnumerable <IMenu> path)
{
if (menu == null)
{
throw new ArgumentNullException("menu");
}
var pageNumber = 0;
await menu.Enter(new Context(this, path));
var pages = new PaginatedAsyncSequence <IMenuItem>(menu.Items);
async Task ExecuteMenuItemAndRefresh(IMenuItem item)
{
var context = new Context(this, path);
await ExecuteItem(item, context);
if (context.MenuInvalidated)
{
await pages.DisposeAsync();
pages = new PaginatedAsyncSequence <IMenuItem>(menu.Items);
}
}
try
{
do
{
options = CreateOptions();
var progressCancellation = new CancellationTokenSource();
var loaderCancellation = new CancellationTokenSource();
var progressTask = Task.Run(async() =>
{
try
{
await Task.Delay(100, progressCancellation.Token);
if (!progressCancellation.Token.IsCancellationRequested)
{
using (var progress = ((IMenuUserInterface)this).StartProgress("Loading... Press [Esc] to cancel"))
{
progress.SetIndeterminate();
var result = await((IMenuUserInterface)this).Select(null, r => (r.Type == PromptType.Cancel, r.Type), progressCancellation.Token);
if (result == PromptType.Cancel)
{
loaderCancellation.Cancel();
}
}
}
}
catch (TaskCanceledException) { }
});
Page <IMenuItem> page;
try
{
page = await pages.GetPage(pageNumber, options.Count, loaderCancellation.Token);
}
finally
{
progressCancellation.Cancel();
await progressTask;
}
if (menu.ExecuteIfSingleItem && page.IsFirstPage && page.Count == 1)
{
await ExecuteMenuItemAndRefresh(page[0]);
break;
}
Render(menu, page, null, path);
var(choice, item) = await Prompt(page);
if (choice == MenuChoice.Cancel)
{
if (await menu.CanExit(new Context(this, path)))
{
break;
}
else
{
continue;
}
}
if (choice == MenuChoice.PreviousPage)
{
--pageNumber;
continue;
}
if (choice == MenuChoice.NextPage)
{
++pageNumber;
continue;
}
if (choice == MenuChoice.Item)
{
Render(menu, page, item, path);
Cons.WriteLine();
Cons.WriteLine("Running...");
Cons.WriteLine();
await ExecuteMenuItemAndRefresh(item);
}
}while (!menu.ShouldExit);
}
finally
{
await pages.DisposeAsync();
}
}
