How can I synchronize the scan status of multiple Virtual Tree View nodes?

Question

There are two levels of nodes in my tree - this is the <Contact list> styles tree.

My problem is that I would like every contact to be checked in all "contact categories". Here is a screenshot of my contact list, which now looks (and yes, I have permission to publish it)

As you can see, Todd Hirsch is marked in the Testing Category category , but not in All Contacts . What I'm trying to achieve is to have contact with the same verified status in each category.

Example: I check Todd Hirsch in the test category - Todd Hirsch is automatically checked in all contacts (and every other category). If I check Todd Hirsch in All Contacts, he will also be checked in the Test category. If I uncheck Todd Hirsch in all contacts, he will also not be deleted in the test category.

I tried to do this through VirtualStringtree OnChecking events, going through the whole tree for each node in the tree, however, when the contact list is large (2000 +), it is very slow, and when there, like 5000 +, it can even crash my program (application stopped working)

What are you offering?

Here is the code that I use to make sure that the contact is checked only once. (This is not what I want now, but it is what I use now.)

////////////////////////////////////////////////////////////////////////////////
/// HasDuplicateChecked
////////////////////////////////////////////////////////////////////////////////
Function HasDuplicateChecked(Node: PVirtualNode): PVirtualNode;
Var
  ParentNode, ChildNode: PVirtualNode;
  I, J: Integer;
Begin

  // IHCW
  Result := Nil;

  // Get the first node of the tree..
  ParentNode := VT.GetFirst;

  // Loop thru the parent nodes.
  for I := 0 to VT.RootNodeCount - 1 do
  begin
    // Get the first child node.
    ChildNode := ParentNode.FirstChild;
    // Loop thru the children..
    for J := 0 to ParentNode.ChildCount - 1 do
    begin
      // If the ChildNode is checked...
      if NodeIsChecked(ChildNode) then
        // And it is NOT the passed node..
        if ChildNode <> Node then
          // but the data matches..
          if GetData(ChildNode).SkypeID = GetData(Node).SkypeID then
          begin
            // Then pass the Childnode as a result, and EXIT!
            Result := ChildNode;
            Exit;
          end;
      // Next child..
      ChildNode := ChildNode.NextSibling;
    end;
    // Next parent...
    ParentNode := ParentNode.NextSibling;
  end;

End;


////////////////////////////////////////////////////////////////////////////////
/// vtSkypeChecking
////////////////////////////////////////////////////////////////////////////////
procedure TSkypeListEventHandler.vtSkypeChecking(Sender: TBaseVirtualTree;
  Node: PVirtualNode; var NewState: TCheckState; var Allowed: Boolean);
Var
  Level: Integer;
  I: Integer;
  Child: PVirtualNode;
begin
  // Allow the checking..
  Allowed := True;
  // Get the Level..
  Level := Sender.GetNodeLevel(Node);

  // If the level is 0 (Category Level)
  if Level = 0 then
  begin
    // And if the Node Childcount is more than 0
    if Node.ChildCount > 0 then
    Begin
      // Get the first child..
      Child := Node.FirstChild;
      // Loop thru the children..
      for I := 0 to Node.ChildCount - 1 do
      begin
        // Set the checkstate, and go next..
        Child.CheckState := NewState;
        Child := Child.NextSibling;
      end;
    End;
  end;


  // If the level is 1 (User Level)
  if Level = 1 then
  begin
    // and if the Node parent is not Nil..
    if Node.Parent <> nil then
    begin
      // aaand, if the new state is Unchecked...
      if (NewState = csUncheckedNormal) or (NewState = csUncheckedPressed) then
      begin
        // .. and if the node checkstate is checked..
        if NodeIsChecked(Node) then
        Begin
          // Set the PARENT node checkstate to Unchecked!
          Node.Parent.CheckState := csUncheckedNormal;
        End;

      end;
      // BUT, if there is a DUPLICATE of the node, screw the above, and
      // forbid the checking!
      if HasDuplicateChecked(Node) <> nil then
        Allowed := False;

    end;
  end;

  // Uncheck all the duplicates.
  UncheckDuplicates;

  // Refresh the Tree
  Sender.Refresh;

end;

Answer 1

-, OnChecking - . OnChecked. OnChecking : " node ?"? , . OnChecked .

-, . toAutoTristateTracking, . ( , . , "undefined".)

, , . node , node , node. , , - , . . , , . , .

. OnChecked, , , . , , , .

procedure PropagateCheckState(Tree: TVirtualStringTree; Node: PVirtualNode);
var
  Data: PNodeData;
  TargetID: string;
  Parent: PVirtualNode;
  FoundOne: Boolean;
begin
  Data := Tree.GetNodeData(Node);
  TargetID := Data.SkypeID;

  Parent := Tree.GetFirst;
  while Assigned(Parent) do begin
    // Assume no user appears twice in the same category
    if Parent <> Tree.NodeParent[Node] then begin
      FoundOne := False;
      Child := Tree.GetFirstChild(Parent);
      while Assigned(Child) and not FoundOne do begin
        Data := Tree.GetNodeData(Child);
        if Data.SkypeID = TargetID then begin
          // Found a duplicate. Sync it with Node.
          Tree.CheckState[Child] := Tree.CheckState[Node];
          FoundOne := True;
        end;
        Child := Tree.GetNextSibling(Child);
      end;
    end;
    Parent := Tree.GetNextSibling(Parent);
  end;
end;

procedure TSkypeListEventHandler.vtSkypeChecked(Sender: TBaseVirtualTree; Node: PVirtualNode);
var
  CheckedEvent: TVTChangeEvent;
begin
  if Sender.GetNodeLevel(Node) = 0 then
    exit; // The tree cascades changes automatically

  Assert(Sender.GetNodeLevel(Node) = 1, 'Unexpected node level');
  // We'll be accessing members that are protected in TBaseVirtualTree, but
  // they're public in TVirtualStringTree, so make sure we're still operating
  // on the same tree.
  Assert(Sender = vtSkype);

  CheckedEvent := vtSkype.OnChecked;
  vtSkype.OnChecked := nil;
  try
    PropagateCheckState(vtSkype, Node);
  finally
    vtSkype.OnChecked := CheckedEvent;
  end;
end;

, , :

procedure PropagateCheckState(Tree: TVirtualStringTree; Node: PVirtualNode);
var
  Data: PNodeData;
  i: Integer;
begin
  Data := Tree.GetNodeData(Node);

  for i := 0 to Pred(Data.User.Nodes.Count) do
    Tree.CheckState[Data.User.Nodes[i]] := Tree.CheckState[Node];
end;

( , ), , , . Delphi, TDictionary<string, TList<PVirtualNode>>. PropagateCheckState :

uses Generics.Collections;

var
  UserNodes: TDictionary<string, TList<PVirtualNode>>;

procedure PropagateCheckState(Tree: TVirtualStringTree; Node: PVirtualNode);
var
  Data: PNodeData;
  Nodes: TList<PVirtualNode>;
  i: Integer;
begin
  Data := Tree.GetNodeData(Node);

  if not UserNodes.TryGetValue(Data.SkypeID, Nodes) then
    exit; // Weird. The node ID isn't in the index at all.

  for i := 0 to Pred(Nodes.Count) do
    Tree.CheckState[Nodes[i]] := Tree.CheckState[Node];
end;

UserNodes , .

Answer 2

, "Todd" , TreeView, . TreeView , , .
, .

, VirtualTreeView , .

Answer 3

GetNext (PVirtualNode, bool childs) ( ++)

TVirtualNode* parent=NULL;
TVirtualNode* node=VST->GetFirst();
 while (node)
    {
    data=static_cast<TreeItemData*>(VST->GetNodeData(node));
    //doo something with node, data
    node=VST->GetNext(node, true);
    }