private bool IsMoveValid()
{
foreach (var button in _buttons.Where(button => SudokuPuzzle.GetColumn(button) == SudokuPuzzle.GetColumn(SelectedButton)))
{
if (SudokuPuzzle.GetValue(button) == SelectedValue)
{
return(false);
}
}
foreach (var button in _buttons.Where(button => SudokuPuzzle.GetRow(button) == SudokuPuzzle.GetRow(SelectedButton)))
{
if (SudokuPuzzle.GetValue(button) == SelectedValue)
{
return(false);
}
}
foreach (var button in _buttons.Where(button => SudokuPuzzle.GetRegion(button) == SudokuPuzzle.GetRegion(SelectedButton)))
{
if (SudokuPuzzle.GetValue(button) == SelectedValue)
{
return(false);
}
}
TextBlock1.Text = string.Empty;
return(true);
}
private void SetCandidates(ref Button button)
{
var candidates = SudokuPuzzle.GetCandidates(button);
candidates = candidates.Replace(SelectedValue.ToString(), " ");
SudokuPuzzle.SetCandidates(button, candidates);
button.Content = Tools.FormatCandidates(candidates);
}
private void LoadSavedGame(bool isReload = false)
{
// LoadGameFromDisk loads the values for each cell from a filed saved on disk.
if (GameState == string.Empty)
{
GameState = Tools.RemoveNewLines(LoadGameFromDisk());
Trace.WriteLine(GameState);
if (GameState.Length != 81)
{
throw new Exception(@"Missing file or incorrect file format.");
}
}
// This reads in the file contents.
var counter = 0;
foreach (var row in Enumerable.Range(1, 9))
{
foreach (var col in Enumerable.Range(1, 9))
{
var value = int.Parse(GameState[counter++].ToString());
var button = (Button)FindName($"Cr{col}{row}");
if (button == null)
{
throw new Exception("Button control not found.");
}
if (!isReload && value > 0)
{
SudokuPuzzle.SetValue(button, value);
SudokuPuzzle.SetIsGiven(button, true);
button.Content = value.ToString();
button.IsEnabled = false;
SetAsGivenCell(ref button);
}
else if (!isReload && value == 0)
{
SudokuPuzzle.SetValue(button, value);
SudokuPuzzle.SetIsGiven(button, false);
button.ContextMenu = FindResource("ContextMenu1") as ContextMenu;
SetCandidates(ref button);
SetAsMarkupCell(ref button);
}
else if (isReload && value > 0 && button.IsEnabled)
{
button.Content = value.ToString();
SetAsUserCell(ref button);
SetCandidates(ref button);
}
}
}
}
private void Cell_Click(object sender, RoutedEventArgs e)
{
if (!(sender is MenuItem mi))
{
return;
}
if (!(mi.CommandParameter is ContextMenu cm))
{
return;
}
if (!(cm.PlacementTarget is Button button))
{
return;
}
if (mi.Header.ToString() == @"Erase")
{
button.Content = string.Empty;
return;
}
SelectedButton = button;
SelectedValue = int.Parse(mi.Header.ToString().Substring(5));
var col = SudokuPuzzle.GetColumn(button);
var row = SudokuPuzzle.GetRow(button);
if (GameState == string.Empty)
{
GameState = LoadGameFromDisk();
}
if (GameState.Length != 81)
{
throw new Exception("Input string format was not valid!");
}
var oldString = GameState;
Trace.WriteLine($"GameState = {oldString}");
var sb = new StringBuilder(oldString);
var startPosition = GetPositionInFileContents(col, row);
sb.Remove(startPosition, 1);
sb.Insert(startPosition, SelectedValue);
var newString = sb.ToString();
GameState = newString;
Trace.WriteLine($"GameState = {newString}");
OnPropertyRaised(GameState);
if (IsMoveValid())
{
button.Content = SelectedValue;
SetCandidates(ref button);
SetAsUserCell(ref button);
LoadSavedGame(true);
}
else
{
ShowMessage("Invalid move!");
}
}