private MultiSelectTreeViewDoEvents _substituteTreeView(MultiSelectTreeViewDoEvents oldTreeView)
{
var newTreeView = _createTreeViewClone(oldTreeView);
Controls.Add(newTreeView);
return(newTreeView);
}
public FastMultiSelectTreeViewsControl()
{
var treeView = new MultiSelectTreeViewDoEvents {
Dock = DockStyle.Fill
};
Controls.Add(treeView);
Font = new Font("Arial", 9F);
}
private void _switchTreeViews(MultiSelectTreeViewDoEvents oldTreeView, MultiSelectTreeViewDoEvents newTreeView)
{
if (oldTreeView != null && newTreeView != null)
{
Controls.SetChildIndex(oldTreeView, Controls.Count - 1);
oldTreeView.Visible = false;
_AsyncRemoveTreeView(oldTreeView);
}
}
private MultiSelectTreeViewDoEvents _createTreeViewClone(MultiSelectTreeView treeView)
{
var treeViewClone = new MultiSelectTreeViewDoEvents
{
Name = treeView.Name,
Location = treeView.Location,
Size = treeView.Size,
TabIndex = treeView.TabIndex,
BackColor = treeView.BackColor,
Visible = treeView.Visible,
Enabled = treeView.Enabled,
ForeColor = treeView.ForeColor,
ContextMenuStrip = treeView.ContextMenuStrip,
Dock = treeView.Dock,
ImageIndex = treeView.ImageIndex,
ImageList = treeView.ImageList,
SelectedImageIndex = treeView.SelectedImageIndex,
Font = treeView.Font,
IsMultiSelectSameParent = treeView.IsMultiSelectSameParent,
StateImageList = treeView.StateImageList,
ShowRootLines = treeView.ShowRootLines,
ShowPlusMinus = treeView.ShowPlusMinus,
ShowNodeToolTips = treeView.ShowNodeToolTips,
ShowLines = treeView.ShowLines,
Scrollable = treeView.Scrollable,
AutoScrollOffset = treeView.AutoScrollOffset,
PathSeparator = treeView.PathSeparator,
Margin = treeView.Margin,
LineColor = treeView.LineColor,
LabelEdit = treeView.LabelEdit,
ItemHeight = treeView.ItemHeight,
HotTracking = treeView.HotTracking,
HideSelection = treeView.HideSelection,
FullRowSelect = treeView.FullRowSelect,
Cursor = treeView.Cursor,
CheckBoxes = treeView.CheckBoxes,
BorderStyle = treeView.BorderStyle,
AllowDrop = treeView.AllowDrop,
AccessibleDescription = treeView.AccessibleDescription,
AccessibleName = treeView.AccessibleName
};
_onCreateTreeView(treeViewClone, treeView);
return(treeViewClone);
}
//-----------------------------------------------------------------------
private MultiSelectTreeView _fastClearNodes(MultiSelectTreeViewDoEvents treeView)
{
var tmpTreeView = treeView;
if (tmpTreeView != null)
{
if (_availableSubstitute(tmpTreeView.Nodes.Count))
{
var newTreeView = _substituteTreeView(tmpTreeView);
_switchTreeViews(tmpTreeView, newTreeView);
return(newTreeView);
}
tmpTreeView.ClearSelectedNodes();
tmpTreeView.Nodes.Clear();
}
return(tmpTreeView);
}
private TreeNode _fastRemoveNodes(MultiSelectTreeViewDoEvents treeView, int removeNodesCount, IEnumerable <TreeNode> removeNodes)
{
TreeNode nextNode = null;
if (treeView.Nodes.Count == removeNodesCount)
{
_fastClearNodes(treeView);
}
else
{
var removeNodesIndexes = _createSortNodeIndexs(removeNodes);
var lastRemoveNodeIndex = removeNodesIndexes.Count == 0 ? -1 : removeNodesIndexes[0];
nextNode = _getNextTreeNode((lastRemoveNodeIndex > -1 && lastRemoveNodeIndex < treeView.Nodes.Count) ? treeView.Nodes[lastRemoveNodeIndex] : null);
if (_availableSubstitute(removeNodesCount))
{
var nodes = _createTreeNodeArray(treeView, removeNodesIndexes, nextNode?.Index ?? -1, out nextNode);
var newTreeView = _substituteTreeView(treeView);
newTreeView.Nodes.AddRange(nodes);
_switchTreeViews(treeView, newTreeView);
}
else
{
treeView.BeginUpdate();
foreach (var removeNodesIndex in removeNodesIndexes.Where(removeNodesIndex => (removeNodesIndex > -1) && (removeNodesIndex < treeView.Nodes.Count)))
{
treeView.Nodes.RemoveAt(removeNodesIndex);
}
treeView.EndUpdate();
}
}
return(nextNode);
}
private static void _RemoveTreeView(MultiSelectTreeViewDoEvents treeView)
{
if (!treeView.IsDisposed)
{
var action = new Action(() =>
{
treeView.Parent = null;
treeView.Size = new Size(1, 1);
treeView.BeginUpdate();
while (treeView.Nodes.Count != 0)
{
treeView.RemoveAt(treeView.Nodes.Count - 1);
}
treeView.EndUpdate();
treeView.Dispose();
GC.Collect();
});
try
{
if (treeView.InvokeRequired)
{
treeView.Invoke(() => action());
}
else
{
action();
}
}
catch (Exception)
{ }
}
}
//-----------------------------------------------------------------------
private static void _AsyncRemoveTreeView(MultiSelectTreeViewDoEvents treeView)
{
var thread = new Thread(() => _RemoveTreeView(treeView));
thread.Start();
}
