private void TreeNode_SelectChanged(object sender, TreeViewEventArgs e)
{
DirectoryDiffEntry?entry = DirectoryDiffTreeView.GetEntryForNode(e.Node);
if (entry != null)
{
GetNodes(entry, out TreeNode? nodeA, out TreeNode? nodeB);
if (nodeA != null && nodeB != null)
{
this.TreeA.SelectedNode = nodeA;
this.TreeB.SelectedNode = nodeB;
}
}
this.UpdateButtons();
}
private void SyncTreeViewScrollPositions(DirectoryDiffTreeView source)
{
DirectoryDiffEntry?entry = DirectoryDiffTreeView.GetEntryForNode(source.TopNode);
if (entry != null)
{
GetNodes(entry, out TreeNode? nodeA, out TreeNode? nodeB);
if (nodeA != null && nodeB != null)
{
this.TreeA.TopNode = nodeA;
this.TreeB.TopNode = nodeB;
}
}
// An alternate but VERY flickery way to do this is:
// int sourcePos = Windows.GetScrollPos(source, false);
// target.BeginUpdate();
// Windows.SetScrollPos(target, false, sourcePos);
// target.EndUpdate();
}
private void TreeNode_StateChange(object sender, TreeViewEventArgs e)
{
DirectoryDiffEntry?entry = DirectoryDiffTreeView.GetEntryForNode(e.Node);
if (entry != null)
{
GetNodes(entry, out TreeNode? nodeA, out TreeNode? nodeB);
if (nodeA != null && nodeB != null)
{
if (e.Action == TreeViewAction.Collapse)
{
// Although the Docs say that Collapse() isn't recursive,
// it actually is. Since clicking the +/- isn't recursive
// we have to simulate that by calling Collapse even on the
// node that fired the event.
if (nodeA.IsExpanded || e.Node == nodeA)
{
nodeA.Collapse();
}
if (nodeB.IsExpanded || e.Node == nodeB)
{
nodeB.Collapse();
}
}
else if (e.Action == TreeViewAction.Expand)
{
if (!nodeA.IsExpanded || e.Node == nodeA)
{
nodeA.Expand();
}
if (!nodeB.IsExpanded || e.Node == nodeB)
{
nodeB.Expand();
}
}
}
}
}