/// <summary>
/// Writes a collection of item for selecting.
/// </summary>
/// <typeparam name="T">The type of data.</typeparam>
/// <param name="cli">The command line interface proxy.</param>
/// <param name="collection">The collection data.</param>
/// <param name="options">The selection display options.</param>
/// <param name="select">The index of item selected.</param>
/// <returns>The result of selection.</returns>
private static SelectionResult <T> Select <T>(StyleConsole cli, SelectionData <T> collection, SelectionConsoleOptions options, int select)
{
var temp = (0, 0, 0, 0, false, false, 0, 0);
var oldSelect = select;
while (true)
{
var list = collection.ToList();
void resetSelect()
{
if (oldSelect < 0 || oldSelect >= list.Count)
{
return;
}
var h = temp.Item3 + (temp.Item5 ? 2 : 1) + (temp.Item6 ? 1 : 0);
var oldItem = list[oldSelect];
var y2 = Math.DivRem(oldSelect % temp.Item7, temp.Item4, out var x2) - h;
x2 *= temp.Item8;
cli.MoveCursorBy(x2, y2);
RenderData(cli, oldItem, options, false, temp.Item8);
cli.MoveCursorBy(-x2 - temp.Item8, -y2);
};
if (temp.Item3 > 0 && select >= temp.Item1 && select < (temp.Item1 + temp.Item2))
{
cli.BackspaceToBeginning();
var h = temp.Item3 + (temp.Item5 ? 2 : 1) + (temp.Item6 ? 1 : 0);
if (oldSelect != select)
{
resetSelect();
}
if (select < 0 || select >= list.Count)
{
select = 0;
}
var item = list[select];
var y = Math.DivRem(select % temp.Item7, temp.Item4, out var x) - h;
x *= temp.Item8;
cli.MoveCursorBy(x, y);
RenderData(cli, item, options, true, temp.Item8);
cli.MoveCursorBy(-x - temp.Item8, -y);
RenderSelectResult(cli, item?.Title, options);
}
else
{
if (temp.Item3 > 0)
{
cli.BackspaceToBeginning();
var h = temp.Item3 + (temp.Item5 ? 2 : 1) + (temp.Item6 ? 1 : 0);
for (var i = 0; i < h; i++)
{
cli.MoveCursorBy(0, -1);
cli.Clear(StyleConsole.RelativeAreas.Line);
}
}
temp = RenderData(cli, list, options, select);
}
oldSelect = select;
ConsoleKeyInfo key;
try
{
key = cli.ReadKey();
}
catch (InvalidOperationException)
{
return(SelectByManualTyping(cli, collection, options));
}
catch (IOException)
{
return(SelectByManualTyping(cli, collection, options));
}
catch (SecurityException)
{
return(SelectByManualTyping(cli, collection, options));
}
catch (NotSupportedException)
{
return(SelectByManualTyping(cli, collection, options));
}
switch (key.Key)
{
case ConsoleKey.Enter:
case ConsoleKey.Select:
case ConsoleKey.Spacebar:
if (select < 0 || select >= list.Count)
{
select = temp.Item1;
if (select < 0 || select >= list.Count)
{
select = 0;
}
break;
}
var sel = list[select];
RenderSelectResult(cli, sel?.Title, options);
cli.WriteLine();
return(new SelectionResult <T>(sel.Title, select, sel.Data, sel.Title));
case ConsoleKey.Backspace:
case ConsoleKey.Delete:
case ConsoleKey.Clear:
cli.WriteImmediately(' ');
cli.BackspaceToBeginning();
resetSelect();
return(SelectByManualTyping(cli, collection, options));
case ConsoleKey.Escape:
case ConsoleKey.Pause:
cli.WriteImmediately(' ');
cli.BackspaceToBeginning();
resetSelect();
RenderSelectResult(cli, null, options);
cli.WriteLine();
return(new SelectionResult <T>(string.Empty, SelectionResultTypes.Canceled));
case ConsoleKey.Help:
case ConsoleKey.F1:
{
cli.BackspaceToBeginning();
resetSelect();
RenderSelectResult(cli, "?", options);
cli.WriteLine();
var item = collection.Get('?', out select);
return(item == null
? new SelectionResult <T>("?", SelectionResultTypes.Selected)
: new SelectionResult <T>("?", select, item.Data, item.Title));
}
case ConsoleKey.F4:
if (temp.Item3 > 0)
{
cli.BackspaceToBeginning();
var h = temp.Item3 + (temp.Item5 ? 2 : 1) + (temp.Item6 ? 1 : 0);
for (var i = 0; i < h; i++)
{
cli.MoveCursorBy(0, -1);
cli.Clear(StyleConsole.RelativeAreas.Line);
}
}
return(SelectByManualTyping(cli, collection, options, true));
case ConsoleKey.F5:
if (key.Modifiers.HasFlag(ConsoleModifiers.Control))
{
select = 0;
}
break;
case ConsoleKey.F6:
cli.BackspaceToBeginning();
resetSelect();
RenderSelectResult(cli, null, options);
cli.WriteLine();
if (key.Modifiers.HasFlag(ConsoleModifiers.Control))
{
select = 0;
}
temp = RenderData(cli, list, options, select);
break;
case ConsoleKey.F12:
{
cli.BackspaceToBeginning();
resetSelect();
RenderSelectResult(cli, "?", options);
cli.WriteLine();
var item = collection.Get('?', out select);
return(item == null
? new SelectionResult <T>("?", SelectionResultTypes.Canceled)
: new SelectionResult <T>("?", select, item.Data, item.Title));
}
case ConsoleKey.PageUp:
if (key.Modifiers.HasFlag(ConsoleModifiers.Control))
{
select = 0;
}
else
{
select = Math.Max(0, temp.Item1 - temp.Item7);
}
break;
case ConsoleKey.PageDown:
if (key.Modifiers.HasFlag(ConsoleModifiers.Control))
{
select = list.Count - 1;
}
else
{
select = Math.Min(list.Count - 1, temp.Item1 + temp.Item7);
}
break;
case ConsoleKey.UpArrow:
if (select < temp.Item4)
{
select += list.Count - (list.Count % temp.Item4);
if (select >= list.Count)
{
select -= temp.Item4;
}
if (select >= list.Count)
{
select = list.Count - 1;
}
else if (select < 0)
{
select = 0;
}
}
else
{
select -= temp.Item4;
}
break;
case ConsoleKey.DownArrow:
select += temp.Item4;
if (select >= list.Count)
{
select %= temp.Item4;
if (select >= list.Count)
{
select = list.Count - 1;
}
}
break;
case ConsoleKey.LeftArrow:
select--;
if (select < 0)
{
select = list.Count - 1;
}
break;
case ConsoleKey.RightArrow:
select++;
if (select >= list.Count)
{
select = 0;
}
break;
case ConsoleKey.Home:
if (key.Modifiers.HasFlag(ConsoleModifiers.Control))
{
select = 0;
}
else
{
select = temp.Item1;
}
break;
case ConsoleKey.End:
if (key.Modifiers.HasFlag(ConsoleModifiers.Control))
{
select = list.Count - 1;
}
else
{
select = temp.Item1 + temp.Item2 - 1;
}
break;
default:
{
var item = collection.Get(key.KeyChar, out select);
if (item == null)
{
select = oldSelect;
continue;
}
cli.WriteImmediately(' ');
cli.BackspaceToBeginning();
resetSelect();
RenderSelectResult(cli, item.Title, options);
cli.WriteLine();
return(new SelectionResult <T>(item.Title, select, item.Data, item.Title));
}
}
}
}
