public void ChangeScan(int delta)
{
if (_msDataFileScanHelper.MsDataSpectra == null)
{
return;
}
if (_msDataFileScanHelper.ScanIndex + delta < 0 || _msDataFileScanHelper.ScanIndex + delta >= _msDataFileScanHelper.ScanProvider.Times.Count)
{
return;
}
var sourceScanIds = _msDataFileScanHelper.GetScanIndexes(_msDataFileScanHelper.Source);
int scanId = sourceScanIds[_msDataFileScanHelper.ScanIndex];
while ((delta < 0 && _msDataFileScanHelper.ScanIndex > 0) || (delta > 0 && _msDataFileScanHelper.ScanIndex < sourceScanIds.Count - 1))
{
_msDataFileScanHelper.ScanIndex += delta;
int newScanId = sourceScanIds[_msDataFileScanHelper.ScanIndex];
if (newScanId != scanId)
{
if (delta < 0)
{
// Choose first scan with a particular scanId by continuing backward until another
// change in scan ID is found.
while (_msDataFileScanHelper.ScanIndex > 0 && sourceScanIds[_msDataFileScanHelper.ScanIndex - 1] == sourceScanIds[_msDataFileScanHelper.ScanIndex])
{
_msDataFileScanHelper.ScanIndex--;
}
}
break;
}
}
LoadScan(false, false);
}
