/// <summary>
/// Removes the specific area.
/// </summary>
/// <param name="area">The area to remove.</param>
public void Clear(RelativeAreas area)
{
Flush();
var h = Handler;
if (h != null)
{
h.Remove(area, context);
Cleared?.Invoke(this, new DataEventArgs<RelativeAreas>(area));
return;
}
switch (Mode)
{
case Modes.Cmd:
try
{
ClearInCmd(area);
break;
}
catch (IOException)
{
}
catch (InvalidOperationException)
{
}
catch (NotSupportedException)
{
}
WriteImmediately(AnsiCodeGenerator.Clear(area));
break;
case Modes.Text:
switch (area)
{
case RelativeAreas.ToEndOfScreen:
case RelativeAreas.ToEndOfLine:
col.Add(new ConsoleText(" \b"));
break;
case RelativeAreas.None:
break;
default:
Write("\b \b");
break;
}
break;
default:
WriteImmediately(AnsiCodeGenerator.Clear(area));
break;
}
Cleared?.Invoke(this, new DataEventArgs<RelativeAreas>(area));
}
private void ClearInCmd(RelativeAreas area)
{
switch (area)
{
case RelativeAreas.Line:
try
{
var l = CursorLeft;
BackspaceInternal(l, 1);
if (BufferWidth < 8) break;
Console.CursorLeft = BufferWidth - 1;
BackspaceInternal(BufferWidth, 1);
Console.SetCursorPosition(l, CursorTop - 1);
}
catch (SecurityException)
{
BackspaceInternal(2, 1);
throw;
}
break;
case RelativeAreas.ToBeginningOfLine:
try
{
BackspaceInternal(CursorLeft, 1);
}
catch (SecurityException)
{
BackspaceInternal(2, 1);
throw;
}
break;
case RelativeAreas.ToEndOfLine:
{
var w = BufferWidth - CursorLeft - 1;
Console.CursorLeft = BufferWidth - 1;
BackspaceInternal(w);
break;
}
case RelativeAreas.EntireScreen:
try
{
var l = CursorLeft;
var t = CursorTop;
Console.SetCursorPosition(BufferWidth - 1, Math.Max(0, CursorTop - 30));
for (; CursorTop <= t;)
{
Console.CursorLeft = BufferWidth - 1;
BackspaceInternal(BufferWidth, 1);
}
var i = 0;
for (; i < 12; i++)
{
Console.CursorLeft = BufferWidth - 1;
BackspaceInternal(BufferWidth, 1);
}
Console.SetCursorPosition(l, Math.Max(0, CursorTop - i - 1));
}
catch (ArgumentException)
{
}
catch (SecurityException)
{
BackspaceInternal(2, 1);
throw;
}
break;
case RelativeAreas.ToBeginningOfScreen:
try
{
var l = CursorLeft;
var t = CursorTop;
Console.SetCursorPosition(BufferWidth - 1, Math.Max(0, CursorTop - 30));
for (; CursorTop < t;)
{
Console.CursorLeft = BufferWidth - 1;
BackspaceInternal(BufferWidth, 1);
}
Console.CursorLeft = l;
BackspaceInternal(CursorLeft, 1);
}
catch (ArgumentException)
{
}
catch (SecurityException)
{
BackspaceInternal(2, 1);
throw;
}
break;
case RelativeAreas.ToEndOfScreen:
{
var l = CursorLeft;
var w = BufferWidth - CursorLeft - 1;
Console.CursorLeft = BufferWidth - 1;
BackspaceInternal(w, 1);
Console.CursorTop++;
var i = 0;
for (; i < 12; i++)
{
Console.CursorLeft = BufferWidth - 1;
BackspaceInternal(BufferWidth, 1);
}
Console.SetCursorPosition(l, Math.Max(0, CursorTop - i - 1));
break;
}
case RelativeAreas.EntireBuffer:
Console.Clear();
break;
}
}