/// <inheritdoc/>
protected override void OnKeyDown(KeyEventArgs e)
{
base.OnKeyDown(e);
// Get all cases for being pressed keys.
switch (e.Key)
{
case var key when key.IsDigit():
{
var pt = Mouse.GetPosition(_imageGrid);
if (IsPointOutOfRange(_imageGrid, pt))
{
e.Handled = true;
return;
}
// Input or eliminate a digit.
if (Keyboard.Modifiers == ModifierKeys.Shift)
{
// Eliminate a digit.
_puzzle[
_pointConverter.GetCellOffset(pt.ToDPointF()),
e.Key.IsDigitUpsideAlphabets() ? e.Key - Key.D1 : e.Key - Key.NumPad1] = true;
}
else if (Keyboard.Modifiers == ModifierKeys.None)
{
// Input a digit.
_puzzle[_pointConverter.GetCellOffset(pt.ToDPointF())] =
e.Key.IsDigitUpsideAlphabets() ? e.Key - Key.D1 : e.Key - Key.NumPad1;
}
UpdateUndoRedoControls();
UpdateImageGrid();
break;
}
case var key when key.IsArrow() && _focusedCells.Count == 1:
{
// Move the focused cell.
int cell = _focusedCells.SetAt(0);
_focusedCells.Clear();
_focusedCells.Add(
e.Key switch
{
Key.Up => cell - 9 < 0 ? cell + 72 : cell - 9,
Key.Down => cell + 9 >= 81 ? cell - 72 : cell + 9,
Key.Left => cell - 1 < 0 ? cell + 8 : cell - 1,
Key.Right => (cell + 1) % 81,
_ => throw Throwings.ImpossibleCase
});
_layerCollection.Add(new FocusLayer(_pointConverter, _focusedCells, Settings.FocusedCellColor));
UpdateImageGrid();
break;
}
