private void LoadDirectoryNodeChildren(DirectoryNodeViewModel directoryNode)
{
if (directoryNode.ChildrenLoaded)
{
return;
}
var directoryEntry = _nodeViewModelLoader.LoadChildren(directoryNode);
if (directoryEntry == null)
{
return;
}
var children = directoryEntry.Entries
.Select(childEntry => {
var node = IncrementalHierarchyBuilder.CreateNodeViewModel(_nodeTemplateFactory, childEntry, directoryNode);
// Initialize template icon if needed
if (node is FileNodeViewModel)
{
if (node.Template.Icon == null)
{
var extension = PathHelpers.GetExtension(childEntry.Name);
Invariants.Assert(extension != null);
node.Template.Icon = _imageSourceFactory.GetFileExtensionIcon(extension);
}
}
return(node);
})
.ToList();
foreach (var child in children)
{
child.ItemId = _nodes.MaxItemId + 1;
_nodes.AddNode(child);
}
directoryNode.SetChildren(children);
}
private ApplyChangesResult ApplyChanges(IncrementalBuildResult buildResult, int hierarchyVersion,
int latestFileSystemTreeVersion)
{
// We need to load these images on the main UI thread
buildResult.FileTemplatesToInitialize.ForAll(item => {
item.Value.Icon = _imageSourceFactory.GetFileExtensionIcon(item.Key);
});
// Apply if nobody beat us to is.
if (_hierarchy.Version == hierarchyVersion)
{
Logger.LogInfo(
"Updating VsHierarchy nodes for version {0} and file system tree version {1}",
hierarchyVersion,
_treeVersion);
_hierarchy.SetNodes(buildResult.NewNodes, buildResult.Changes);
return(ApplyChangesResult.Done);
}
Logger.LogInfo(
"VsHierarchy nodes have been updated concurrently, re-run or skip operation." +
" Node verions={0}-{1}, Tree versions:{2}-{3}.",
hierarchyVersion, _hierarchy.Version,
_treeVersion, latestFileSystemTreeVersion);
// If the version of the hieararchy has changed since when we started,
// another thread has passed us. This means the decisions we made
// about the changes to apply are incorrect at this point. So, we run
// again if we are processing the latest known version of the file
// system tree, as we should be the winner (eventually)
if (_treeVersion == latestFileSystemTreeVersion)
{
// Termination notes: We make this call only when the VsHierarchy
// version changes between the time we capture it and this point.
return(ApplyChangesResult.Retry);
}
return(ApplyChangesResult.Bail);
}