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 void AddNodeForChildren(FileSystemEntry entry, NodeViewModel oldParent, NodeViewModel newParent)
{
Invariants.Assert(entry != null);
Invariants.Assert(newParent != null);
Invariants.Assert(newParent.Children.Count == 0);
// Create children nodes
var directoryEntry = entry as DirectoryEntry;
if (directoryEntry != null)
{
foreach (var childEntry in directoryEntry.Entries.ToForeachEnum())
{
var child = CreateNodeViewModel(childEntry, newParent);
newParent.AddChild(child);
}
}
// Note: It is correct to compare the "Name" property only for computing
// diffs, as we are guaranteed that both nodes have the same parent, hence
// are located in the same directory. We also use the
// System.Reflection.Type to handle the fact a directory can be deleted
// and then a name with the same name can be added. We need to consider
// that as a pair of "delete/add" instead of a "no-op".
var diffs = ArrayUtilities.BuildArrayDiffs(
oldParent == null ? ArrayUtilities.EmptyList <NodeViewModel> .Instance : oldParent.Children,
newParent.Children,
NodeTypeAndNameComparer.Instance);
foreach (var item in diffs.LeftOnlyItems.ToForeachEnum())
{
_changes.DeletedItems.Add(item.ItemId);
}
foreach (var newChild in diffs.RightOnlyItems.ToForeachEnum())
{
newChild.ItemId = _newNodeNextItemId;
_newNodeNextItemId++;
newChild.IsExpanded = newParent.IsRoot;
_newNodes.AddNode(newChild);
if (oldParent != null)
{
_changes.AddedItems.Add(newChild.ItemId);
}
}
foreach (var pair in diffs.CommonItems.ToForeachEnum())
{
pair.RigthtItem.ItemId = pair.LeftItem.ItemId;
pair.RigthtItem.IsExpanded = pair.LeftItem.IsExpanded;
_newNodes.AddNode(pair.RigthtItem);
}
// Call recursively on all children
if (directoryEntry != null)
{
Invariants.Assert(directoryEntry.Entries.Count == newParent.Children.Count);
for (var i = 0; i < newParent.Children.Count; i++)
{
var childEntry = directoryEntry.Entries[i];
var newChildNode = newParent.Children[i];
var oldChildNode = GetCommonOldNode(newParent, i, diffs, newChildNode);
AddNodeForChildren(childEntry, oldChildNode, newChildNode);
}
}
}
private void AddNodeForChildren(IDictionary <RelativePath, DirectoryEntry> previouslyLoadedChildren,
NodeViewModel oldParent, NodeViewModel newParent)
{
Invariants.Assert(oldParent != null);
Invariants.Assert(newParent != null);
Invariants.Assert(newParent.Children.Count == 0);
var oldParentDirectory = oldParent as DirectoryNodeViewModel;
if (oldParentDirectory == null)
{
return;
}
var newParentDirectory = newParent as DirectoryNodeViewModel;
if (newParentDirectory == null)
{
return;
}
var oldParentChildrenList = oldParentDirectory.CopyChildren();
// Note: The "IsRoot" test is to ensure we always load children of the root node
// so that the returned hierarchy is not empty.
if (oldParentChildrenList.Count == 0 && !oldParent.IsRoot)
{
return;
}
// Create children nodes
var directoryEntry = LoadNewNodeChildren(previouslyLoadedChildren, newParentDirectory);
if (directoryEntry != null)
{
foreach (var childEntry in directoryEntry.Entries.ToForeachEnum())
{
var child = CreateNodeViewModel(childEntry, newParent);
newParent.AddChild(child);
}
}
// Note: It is correct to compare the "Name" property only for computing
// diffs, as we are guaranteed that both nodes have the same parent, hence
// are located in the same directory. We also use the
// System.Reflection.Type to handle the fact a directory can be deleted
// and then a name with the same name can be added. We need to consider
// that as a pair of "delete/add" instead of a "no-op".
var diffs = ArrayUtilities.BuildArrayDiffs(oldParentChildrenList, newParent.Children,
NodeTypeAndNameComparer.Instance);
// Mark deleted items
foreach (var item in diffs.LeftOnlyItems.ToForeachEnum())
{
_changes.DeletedItems.Add(item.ItemId);
}
// Mark added items
foreach (var newChild in diffs.RightOnlyItems.ToForeachEnum())
{
newChild.ItemId = _newNodeNextItemId;
_newNodeNextItemId++;
newChild.IsExpanded = newParent.IsRoot;
_newNodes.AddNode(newChild);
_changes.AddedItems.Add(newChild.ItemId);
}
// Commons items don't need updating, just adding to the new parent
foreach (var pair in diffs.CommonItems.ToForeachEnum())
{
pair.RigthtItem.ItemId = pair.LeftItem.ItemId;
pair.RigthtItem.IsExpanded = pair.LeftItem.IsExpanded;
_newNodes.AddNode(pair.RigthtItem);
}
// Call recursively on all children
if (directoryEntry != null)
{
Invariants.Assert(directoryEntry.Entries.Count == newParent.Children.Count);
for (var i = 0; i < newParent.Children.Count; i++)
{
var newChildNode = newParent.Children[i];
var oldChildNode = GetCommonOldNode(newParent, i, diffs, newChildNode);
if (oldChildNode != null)
{
AddNodeForChildren(previouslyLoadedChildren, oldChildNode, newChildNode);
}
}
}
}