/// <summary>
/// Проверить возможность сменить выбранный элемент с элементом выбранного направления.
/// </summary>
/// <param name="direction">Направление проверки</param>
/// <returns>Смена возможна</returns>
public bool CheckSwap(MovementDirection direction)
{
if (_field.SelectedCell == null || _field.SelectedCell.Element == null)
{
return(false);
}
CellModel swipeElement = null;
switch (direction)
{
case MovementDirection.Up:
if (_field.SelectedCell.Y + 1 < _field.Height)
{
swipeElement = _field.GetCell(_field.SelectedCell.X, _field.SelectedCell.Y + 1);
}
break;
case MovementDirection.Right:
if (_field.SelectedCell.X + 1 < _field.Width)
{
swipeElement = _field.GetCell(_field.SelectedCell.X + 1, _field.SelectedCell.Y);
}
break;
case MovementDirection.Down:
if (_field.SelectedCell.Y - 1 >= 0)
{
swipeElement = _field.GetCell(_field.SelectedCell.X, _field.SelectedCell.Y - 1);
}
break;
case MovementDirection.Left:
if (_field.SelectedCell.X - 1 >= 0)
{
swipeElement = _field.GetCell(_field.SelectedCell.X - 1, _field.SelectedCell.Y);
}
break;
default:
throw new ArgumentOutOfRangeException("direction", direction, null);
}
if (swipeElement == null || swipeElement.Element == null)
{
return(false);
}
if (!AvailableSwap(_field.SelectedCell.X, _field.SelectedCell.Y,
swipeElement.Element.Type, direction) &&
!AvailableSwap(swipeElement.X, swipeElement.Y,
_field.SelectedCell.Element.Type, direction.InvertDirection()))
{
return(false);
}
return(true);
}
/// <summary>
/// Поменять местами элементы.
/// </summary>
/// <param name="cell">Ячейка с элементом для замены</param>
/// <param name="direction">Направление замены</param>
public void SwapElements(CellModel cell, MovementDirection direction)
{
if (WaitFinishMovementElements > 0)
{
return;
}
ElementModel firstElement;
ElementModel secondElement;
switch (direction)
{
case MovementDirection.Up:
if (!_exchange.CheckSwap(MovementDirection.Up))
{
return;
}
if (cell.Y + 1 >= _field.Height)
{
return;
}
firstElement = cell.Element;
secondElement = _field.GetCell(cell.X, cell.Y + 1).Element;
cell.SetElement(secondElement);
_field.GetCell(cell.X, cell.Y + 1).SetElement(firstElement);
break;
case MovementDirection.Right:
if (!_exchange.CheckSwap(MovementDirection.Right))
{
return;
}
if (cell.X + 1 >= _field.Width)
{
return;
}
firstElement = cell.Element;
secondElement = _field.GetCell(cell.X + 1, cell.Y).Element;
cell.SetElement(secondElement);
_field.GetCell(cell.X + 1, cell.Y).SetElement(firstElement);
break;
case MovementDirection.Down:
if (!_exchange.CheckSwap(MovementDirection.Down))
{
return;
}
if (cell.Y - 1 < 0)
{
return;
}
firstElement = cell.Element;
secondElement = _field.GetCell(cell.X, cell.Y - 1).Element;
cell.SetElement(secondElement);
_field.GetCell(cell.X, cell.Y - 1).SetElement(firstElement);
break;
case MovementDirection.Left:
if (!_exchange.CheckSwap(MovementDirection.Left))
{
return;
}
if (cell.X - 1 < 0)
{
return;
}
firstElement = cell.Element;
secondElement = _field.GetCell(cell.X - 1, cell.Y).Element;
cell.SetElement(secondElement);
_field.GetCell(cell.X - 1, cell.Y).SetElement(firstElement);
break;
default:
throw new ArgumentOutOfRangeException("direction", direction, null);
}
if (firstElement != null && secondElement != null)
{
WaitFinishMovementElements = 2;
firstElement.Swap(direction);
secondElement.Swap(direction.InvertDirection());
}
}
