private void DataGrid_OnPreviewKeyDown(object sender, KeyEventArgs e)
{
var hex = KeyUtils.GetHexDigit(e.Key);
if (!hex.HasValue && e.Key != Key.Space && e.Key != Key.Delete && e.Key != Key.Back)
{
return;
}
var direction = e.Key != Key.Back ? 1 : -1;
var grid = sender as DataGrid;
if (grid == null)
{
return;
}
var board = Board;
if (board == null)
{
return;
}
var cellInfo = grid.CurrentCell;
if (cellInfo.Item == null)
{
return;
}
var cell = cellInfo.Column.GetCellContent(cellInfo.Item);
if (cell == null)
{
return;
}
var line = cell.DataContext as HexBoardLine;
if (line == null)
{
return;
}
var col = cellInfo.Column;
var byteIndex = col.DisplayIndex - 1;
if (byteIndex < 0 || byteIndex > 15)
{
return;
}
var bt = line.Bytes[byteIndex];
if (bt != _focusedByte)
{
_high = true;
}
_focusedByte = bt;
var nextAdr = line.Address + byteIndex + direction;
if (hex.HasValue)
{
if (_high)
{
_focusedByte.SetHigh((byte)hex.Value);
}
else
{
_focusedByte.SetLow((byte)hex.Value);
SelectByAddress(nextAdr);
}
_high = !_high;
}
else
{
_focusedByte.Value = null;
SelectByAddress(nextAdr);
}
}