How to select all root or all child nodes in VirtualStringTree?
I would like to select either all root nodes or all child nodes (not all nodes in a VirtualTreeView).
I've tried to use this code to select all root nodes:
procedure SelectAllRoots;
var
Node: PVirtualNode;
begin
Form1.VirtualStringTree1.BeginUpdate;
Node := Form1.VirtualStringTree1.GetFirst;
while True do
begin
if Node = nil then
Break;
if not (vsSelected in Node.States) then
Node.States := Node.States + [vsSelected];
Node := Form1.VirtualStringTree1.GetNext(Node);
end;
Form1.VirtualStringTree1.EndUpdate;
end;
I can tell there's a small glitch. The selection is either incomplete or gets stuck. What am I doing wrong ?
Edit:
I use MultiSelection.
1. Select all root nodes:
To select all root nodes, you can use the following procedure:
procedure SelectRootNodes(AVirtualTree: TBaseVirtualTree);
var
Node: PVirtualNode;
begin
AVirtualTree.BeginUpdate;
try
Node := AVirtualTree.GetFirst;
while Assigned(Node) do
begin
AVirtualTree.Selected[Node] := True;
Node := AVirtualTree.GetNextSibling(Node);
end;
finally
AVirtualTree.EndUpdate;
end;
end;
2. Select all child nodes:
To select all child nodes, level independent, you need to use recursive function like this:
procedure SelectChildNodes(AVirtualTree: TBaseVirtualTree);
var
Node: PVirtualNode;
procedure SelectSubNodes(ANode: PVirtualNode);
var
SubNode: PVirtualNode;
begin
SubNode := AVirtualTree.GetFirstChild(ANode);
while Assigned(SubNode) do
begin
SelectSubNodes(SubNode);
AVirtualTree.Selected[SubNode] := True;
SubNode := AVirtualTree.GetNextSibling(SubNode);
end;
end;
begin
AVirtualTree.BeginUpdate;
try
Node := AVirtualTree.GetFirst;
while Assigned(Node) do
begin
SelectSubNodes(Node);
Node := AVirtualTree.GetNextSibling(Node);
end;
finally
AVirtualTree.EndUpdate;
end;
end;