/// <summary>
/// Ensures that all real nodes are up-to-date with the virtual ones.
/// </summary>
private void Devirtualise(VirtualTreeNodeCollection nodes)
{
if (NodeCollectionRequiresUpdate(nodes.Owner))
{
nodes.Owner.RealNodes.Clear();
nodes.Owner.RealNodes.AddRange(new List <VirtualTreeNode>(nodes).ToArray());
}
}
private void UpdateNodes(VirtualTreeNodeCollection oldNodes, IList <VirtualTreeNode> newNodes, ref bool doneBeginUpdate)
{
for (int i = 0; i < Math.Max(oldNodes.Count, newNodes.Count);)
{
if (oldNodes.Count > i && newNodes.Count > i)
{
if (oldNodes[i].Nodes.Count > 0 && newNodes[i].Nodes.Count == 0 && oldNodes[i].IsExpanded)
{
// fix for issues CA-34486 and CA-36409
// see VirtualTreeViewTests.TestUpdateWhenRemoveAllChildNodesOfExandedParent
// When merging sets of tree-nodes using UpdateRootNodes, if you remove all of
// the child-nodes from a node, the node still remembers its IsExpanded state
// from before the nodes were removed regardless of whether you call Collapse()
// or Expand() after the nodes were removed.
// This causes problems for the Virtual treeview as it
// relies the BeforeExpanded event to convert DummyTreeNodes into VirtualTreeNodes
// on population.
oldNodes[i].Collapse();
}
UpdateNode(newNodes[i], oldNodes[i], ref doneBeginUpdate);
UpdateNodes(oldNodes[i].Nodes, newNodes[i].Nodes, ref doneBeginUpdate);
i++;
}
else if (oldNodes.Count <= i && newNodes.Count > i)
{
LogTreeView("Adding node " + newNodes[i].Text);
DoBeginUpdateIfRequired(ref doneBeginUpdate);
oldNodes.Add(newNodes[i]);
UpdateNodes(oldNodes[i].Nodes, newNodes[i].Nodes, ref doneBeginUpdate);
i++;
}
else
{
LogTreeView("Removing node " + oldNodes[i].Text);
DoBeginUpdateIfRequired(ref doneBeginUpdate);
oldNodes.RemoveAt(i);
}
}
}
/// <summary>
/// Initializes a new instance of the <see cref="VirtualTreeView"/> class.
/// </summary>
public VirtualTreeView()
{
_nodes = new VirtualTreeNodeCollection(this);
_selectedNodes = new VirtualTreeSelectedNodeCollection(this);
}
/// <summary>
/// Initializes a new instance of the <see cref="VirtualTreeView"/> class.
/// </summary>
public VirtualTreeView()
{
_nodes = new VirtualTreeNodeCollection(this);
_selectedNodes = new VirtualTreeSelectedNodeCollection(this);
}
private void UpdateNodes(VirtualTreeNodeCollection oldNodes, IList<VirtualTreeNode> newNodes, ref bool doneBeginUpdate)
{
for (int i = 0; i < Math.Max(oldNodes.Count, newNodes.Count); )
{
if (oldNodes.Count > i && newNodes.Count > i)
{
if (oldNodes[i].Nodes.Count > 0 && newNodes[i].Nodes.Count == 0 && oldNodes[i].IsExpanded)
{
// fix for issues CA-34486 and CA-36409
// see VirtualTreeViewTests.TestUpdateWhenRemoveAllChildNodesOfExandedParent
// When merging sets of tree-nodes using UpdateRootNodes, if you remove all of
// the child-nodes from a node, the node still remembers its IsExpanded state
// from before the nodes were removed regardless of whether you call Collapse()
// or Expand() after the nodes were removed.
// This causes problems for the Virtual treeview as it
// relies the BeforeExpanded event to convert DummyTreeNodes into VirtualTreeNodes
// on population.
oldNodes[i].Collapse();
}
UpdateNode(newNodes[i], oldNodes[i], ref doneBeginUpdate);
UpdateNodes(oldNodes[i].Nodes, newNodes[i].Nodes, ref doneBeginUpdate);
i++;
}
else if (oldNodes.Count <= i && newNodes.Count > i)
{
LogTreeView("Adding node " + newNodes[i].Text);
DoBeginUpdateIfRequired(ref doneBeginUpdate);
oldNodes.Add(newNodes[i]);
UpdateNodes(oldNodes[i].Nodes, newNodes[i].Nodes, ref doneBeginUpdate);
i++;
}
else
{
LogTreeView("Removing node " + oldNodes[i].Text);
DoBeginUpdateIfRequired(ref doneBeginUpdate);
oldNodes.RemoveAt(i);
}
}
}
/// <summary>
/// Ensures that all real nodes are up-to-date with the virtual ones.
/// </summary>
private void Devirtualise(VirtualTreeNodeCollection nodes)
{
if (NodeCollectionRequiresUpdate(nodes.Owner))
{
nodes.Owner.RealNodes.Clear();
nodes.Owner.RealNodes.AddRange(new List<VirtualTreeNode>(nodes).ToArray());
}
}
