void ExplorerTreeView_BeforeExpand(object sender, TreeViewCancelEventArgs e)
{
Cursor oldCursor = this.Cursor;
ShellItem item = (ShellItem)e.Node.Tag;
ShellItem shRoot = (ShellItem)root.Tag;
Cursor = Cursors.WaitCursor;
Enabled = false;
if (!item.Equals(shRoot))
{
if (e.Node.Nodes.Count == 1 && e.Node.Nodes[0].Text.Equals(" : "))
{
e.Node.Nodes.Clear();
List <ShellItem> subDirs = item.GetFolders(true);
TreeNode[] nodes = new TreeNode[subDirs.Count];
for (int i = 0; i < subDirs.Count; i++)
{
nodes[i] = MakeNode(subDirs[i]);
}
e.Node.Nodes.AddRange(nodes);
}
else
{
RefreshNode(e.Node);
}
}
Enabled = true;
Cursor = oldCursor;
}
private void LoadRoot()
{
ShellItem desktop = new ShellItem();
List <ShellItem> subDirs;
root = new TreeNode(desktop.Text);
root.ImageIndex = imageList.GetIconIndex(desktop, false);
root.SelectedImageIndex = imageList.GetIconIndex(desktop, true);
root.Tag = desktop;
subDirs = desktop.GetFolders(true);
foreach (ShellItem sh in subDirs)
{
root.Nodes.Add(MakeNode(sh));
}
Nodes.Clear();
Nodes.Add(root);
root.Expand();
}
public void RefreshNode(TreeNode node)
{
ShellItem nodeItem = (ShellItem)node.Tag;
if (!(node.Nodes.Count == 1 && node.Nodes[0].Text.Equals(" : ")))
{
if (nodeItem.RefreshFolders())
{
List <ShellItem> curDirs = new List <ShellItem>();
curDirs.AddRange(nodeItem.GetFolders(false));
List <TreeNode> invalidNodes = new List <TreeNode>();
bool match;
foreach (TreeNode tn in node.Nodes)
{
match = false;
for (int i = 0; i < curDirs.Count; i++)
{
if (curDirs[i].Equals(tn.Tag))
{
curDirs.RemoveAt(i);
match = true;
break;
}
}
if (!match)
{
invalidNodes.Add(tn);
}
}
if (invalidNodes.Count + curDirs.Count > 0)
{
try
{
BeginUpdate();
TreeViewNodeSorter = null;
TreeNode[] nodes = new TreeNode[curDirs.Count];
int i = 0;
foreach (TreeNode tn in invalidNodes)
{
node.Nodes.Remove(tn);
}
foreach (ShellItem sh in curDirs)
{
nodes[i] = MakeNode(sh);
i++;
}
node.Nodes.AddRange(nodes);
TreeViewNodeSorter = sorter;
}
catch (Exception e)
{
Debug.WriteLine(e.Message);
}
finally
{
EndUpdate();
}
}
}
}
}
private void GetListViewItems(object sender, DoWorkEventArgs e)
{
BackgroundWorker worker = (BackgroundWorker)sender;
Stopwatch watch = new Stopwatch();
ShellItem parent = e.Argument as ShellItem;
watch.Reset();
watch.Start();
List <ShellItem> subFolders = parent.GetFolders(false);
List <ShellItem> subFiles = parent.GetFiles();
watch.Stop();
int foldersCount = subFolders.Count;
int filesCount = subFiles.Count;
ListViewItem[] files = new ListViewItem[filesCount];
ListViewItem[] folders = new ListViewItem[foldersCount];
if (foldersCount + filesCount > 0)
{
mre.WaitOne();
Thread t1 = null;
Thread t2 = null;
Thread t3 = null;
Thread t4 = null;
bool slow = watch.ElapsedMilliseconds > 800;
if (slow)
{
int quarter = filesCount >> 2;
int half = filesCount >> 1;
t1 = new Thread(delegate() { LoadListViewItems(files, subFiles, 0, quarter); });
t2 = new Thread(delegate() { LoadListViewItems(files, subFiles, quarter, half); });
t3 = new Thread(delegate() { LoadListViewItems(files, subFiles, half, half + quarter); });
t4 = new Thread(delegate() { LoadListViewItems(files, subFiles, half + quarter, filesCount); });
t1.SetApartmentState(ApartmentState.MTA);
t2.SetApartmentState(ApartmentState.MTA);
t3.SetApartmentState(ApartmentState.MTA);
t4.SetApartmentState(ApartmentState.MTA);
t1.Start();
t2.Start();
t3.Start();
t4.Start();
LoadListViewItems(folders, subFolders, 0, foldersCount);
}
else
{
t1 = new Thread(delegate() { LoadListViewItems(files, subFiles, 0, filesCount); });
t1.Start();
LoadListViewItems(folders, subFolders, 0, foldersCount);
}
Array.Sort(folders, sorter);
Items.AddRange(folders);
if (slow)
{
t1.Join();
t2.Join();
t3.Join();
t4.Join();
}
else
{
t1.Join();
}
}
worker.ReportProgress(100, files);
}