public void TypeBackspace(CharacterView view)
{
var len = CurrentRowLength;
var viewOffsetX = 0;
var viewOffsetY = 0;
if (CursorX == 0 && CursorY > 0)
{
var prevRowLength = _rows[CursorY - 1].Length;
_rows[CursorY - 1] += _rows[CursorY];
_rows.RemoveAt(CursorY);
CursorX = prevRowLength;
CursorY--;
if (CursorY > 0)
{
viewOffsetY--;
}
}
else if (CursorX > 0 && CursorX > len)
{
MoveLeft(view, false);
if (CursorX > 0)
{
viewOffsetX--;
}
}
else if (CursorX == 1)
{
_rows[CursorY] = _rows[CursorY].Substring(1);
CursorX = 0;
}
else if (len > 0 && CursorX == len)
{
_rows[CursorY] = _rows[CursorY].Substring(0, len - 1);
CursorX--;
viewOffsetX--;
}
else if (CursorX > 0)
{
var left = _rows[CursorY].Substring(0, CursorX - 1);
var right = _rows[CursorY].Substring(CursorX);
_rows[CursorY] = left + right;
CursorX--;
viewOffsetX--;
}
if (_options.ScrollAhead)
{
view.EnsurePositionIsVisible(CursorX + viewOffsetX, CursorY + viewOffsetY);
}
else
{
view.EnsurePositionIsVisible(Cursor);
}
}
private void DeleteSelection(CharacterView view)
{
var selectionOperations = Selections.OrderByDescending(x => x.LineIndex).ToList();
foreach (var selectionOperation in selectionOperations)
{
switch (selectionOperation.SelectionType)
{
case SelectionType.NotSelected:
continue;
case SelectionType.FullRow:
_rows.RemoveAt(selectionOperation.LineIndex);
continue;
case SelectionType.Range:
break;
default:
throw new ArgumentOutOfRangeException();
}
}
if (_rows.Count < 1)
{
_rows.Add("");
}
while (CursorY >= _rows.Count)
{
CursorY--;
}
Selections.ClearSelection();
view.EnsurePositionIsVisible(Cursor);
}
public void Outdent(CharacterArea area, CharacterView view)
{
if (area.CurrentRowLength <= 0)
{
return;
}
for (var t = 0; t < 3; t++)
{
if (area.CurrentRow[0] != ' ')
{
continue;
}
area.DeleteAt(0, area.CursorY);
if (area.CursorX > 0)
{
area.CursorX--;
}
}
var offsetX = _options.ScrollAhead && area.CursorX > 0 ? -1 : 0;
view.EnsurePositionIsVisible(area.CursorX + offsetX, area.CursorY);
}