public bool TouchCell(SquareDataViewModel cell)
{
if (cell == null)
{
return(false);
}
int x, y;
FindXY(cell, out x, out y);
int cellIndex = Definition.GetCellIndex(x, y);
int lastCellIndex = SelectedCells.Count == 0 ? -1 : SelectedCells.Last();
Debug.WriteLine($"TouchCell: {x}, {y}: {cell}");
if (IsGameOver)
{
return(false);
}
if (SelectedLine == null)
{
return(false);
}
if (lastCellIndex == cellIndex)
{
return(false); // Ain't moved
}
if (cell.TouchState == TouchState.Touched)
{
return(false);
}
// Touching another line start/end
if (cell.Fixed && cell.GameLine != SelectedLine)
{
return(false);
}
// If selected cell is already in the list. This is when the user goes backwards
if (SelectedCells.Contains(cellIndex))
{
// The user has back tracked
var index = SelectedCells.LastIndexOf(cellIndex);
while (SelectedCells.Count > index)
{
var last = SelectedCells.Last();
SelectedCells.RemoveAt(SelectedCells.Count() - 1);
int lastX, lastY;
Definition.GetCellXY(last, out lastX, out lastY);
var lastCell = Grid[lastX, lastY];
lastCell.TouchState = TouchState.UnTouched;
}
if (index < SelectedCells.Count)
{
SelectedCells.RemoveRange(index + 1, SelectedCells.Count - index);
}
return(true);
}
if (lastCellIndex >= 0)
{
if (!AreCellsNextToEachOther(lastCellIndex, cellIndex))
{
return(false);
}
}
cell.TouchState = TouchState.Touching;
cell.GameLine = SelectedLine;
SelectedCells.Add(cellIndex);
return(true);
}