Example: Node.Selected, TreeList.GetSelections, OptionSelection.MultiSelect

• Jul 30, 2021
• 2 minutes to read

The following sample selects all the nodes within the control that have identical values within a column. The index of the column is passed via the AItemIndex parameter. You can pass the index of the focused column as a parameter (see FocusedColumn). Additionally, you can use the OnFocusedColumnChanged event to select the “same” nodes when the end-user selects columns within the control.

Note that the MultiSelect option should be enabled.

Delphi

procedure SelectIdenticalNodes(AItemIndex: Integer);
var
  I, J: Integer;
  AValue: String;
  ASelectedNodes: TList;
  AValueList: TStringList;
begin
  if not cxTreeList.OptionsSelection.MultiSelect then Exit;
  ASelectedNodes := TList.Create;
  AValueList := TStringList.Create;
  try
    cxTreeList.GetSelections(ASelectedNodes);
    for I := 0 to ASelectedNodes.Count - 1 do
    begin
      AValue := TcxTreeListNode(ASelectedNodes[I]).Texts[AItemIndex];
      if AValueList.IndexOf(AValue) = -1 then
        AValueList.Add(AValue);
    end;
    cxTreeList.BeginUpdate;
    try
      for I := 0 to cxTreeList.Nodes.Count - 1 do
      begin
        AValueList.Sort;
        AValue := cxTreeList.Nodes[I].Texts[AItemIndex];
        if AValueList.Find(AValue, J) then
          cxTreeList.Nodes[I].Selected := True;
      end;
      finally
        cxTreeList.EndUpdate;
      end;
  finally
    AValueList.Free;
    ASelectedNodes.Free;
  end;
end;

C++

void SelectIdenticalNodes(int AItemIndex){
  if (!cxTreeList->OptionsSelection->MultiSelect) return;
  TList *ASelectedNodes = new TList();
  TStringList *AValueList = new TStringList();
  String AValue;
  try {
    cxTreeList->GetSelections(ASelectedNodes);
    for (int I = 0; I < ASelectedNodes->Count; I++){
      AValue = ((TcxTreeListNode*)ASelectedNodes->Items[I])->Texts[AItemIndex];
      if (AValueList->IndexOf(AValue) == -1)
        AValueList->Add(AValue);
    }
    cxTreeList->BeginUpdate();
    try {
      int J;
      for (int I = 0; I < cxTreeList->Nodes->Count; I++){
        AValueList->Sort();
        AValue = cxTreeList->Nodes->Items[I]->Texts[AItemIndex];
        if (AValueList->Find(AValue, J))
          cxTreeList->Nodes->Items[I]->Selected = true;
      }
    }
    __finally{
      cxTreeList->EndUpdate();
    }
  }
  __finally{
    delete AValueList;
    delete ASelectedNodes;
  }
}