// ================================================================================= Observer methods
protected override void OnNodeCreated(object sender, NodeEventArgs e)
{
base.OnNodeCreated(sender, e);
if (e.SourceNode.CopyInProgress)
{
return;
}
DocumentPreviewProvider.StartPreviewGeneration(e.SourceNode, GetPriority(e.SourceNode as File));
}
protected override void OnNodeModified(object sender, NodeEventArgs e)
{
base.OnNodeModified(sender, e);
// check: fire only when the relevant fields had been modified (binary, version, ...)
if (!e.ChangedData.Any(d => MONITORED_FIELDS.Contains(d.Name)))
{
return;
}
DocumentPreviewProvider.StartPreviewGeneration(e.SourceNode, GetPriority(e.SourceNode as File));
}
protected override void OnNodeModified(object sender, NodeEventArgs e)
{
base.OnNodeModified(sender, e);
// check: fire only when the relevant fields had been modified (binary, version, ...)
if (!e.ChangedData.Any(d => MONITORED_FIELDS.Contains(d.Name)))
{
return;
}
var versionData = e.ChangedData.FirstOrDefault(d => d.Name.Equals("Version", StringComparison.OrdinalIgnoreCase));
if (versionData != null)
{
var originalVersion = VersionNumber.Parse(versionData.Original.ToString());
// if the status changed from Locked to not locked, and the version number has been decreesed: undo or checkin
if (originalVersion.Status == VersionStatus.Locked &&
e.SourceNode.Version.Status != VersionStatus.Locked &&
originalVersion > e.SourceNode.Version &&
DocumentPreviewProvider.Current.IsContentSupported(e.SourceNode))
{
// Undo or Checkin: we will start to delete unnecessary images for the
// removed version (w/o waiting for the delete operations to complete).
DocumentPreviewProvider.Current.RemovePreviewImagesAsync(e.SourceNode.Id, originalVersion);
// This was an UNDO operation, it is unnecessary to start a preview generator process
if (string.Compare(NodeOperation.UndoCheckOut, e.SourceNode.NodeOperation, StringComparison.OrdinalIgnoreCase) == 0)
{
return;
}
}
}
DocumentPreviewProvider.StartPreviewGeneration(e.SourceNode, GetPriority(e.SourceNode as File));
}