How to select nothing by clicking the empty background?

Question

I have a Virtual Treeview (e.g. TVirtualStringTree). The user can select a row but it would be nice if they could also do the intuitiave thing of clicking "nowhere" to select no row Note: Of course multiselect is off; because they can only select zero or one items MCRE: procedure TForm6.FormCreate(Sender: TObject); var vst: TVirtualStringTree; begin vst := VirtualStringTree1; vst.RootNodeCount := 5; vst.TreeOptions.SelectionOptions := vst.TreeOptions.SelectionOptions + [toFullRowSelect]; vst.Header.Options := vst.Header.Options + [hoVisible]; vst.Header.Columns.Add; vst.Header.Columns.Add; vst.Header.Columns.Add; vst.Header.Columns.Add; vst.Header.Columns.Add; end; JavaScript questions and answers, JavaScript questions pdf, JavaScript question bank, JavaScript questions and answers pdf, mcq on JavaScript pdf, JavaScript questions and solutions, JavaScript mcq Test , Interview JavaScript questions, JavaScript Questions for Interview, JavaScript MCQ (Multiple Choice Questions)

Answer 1

This should work out-of-the-box if toAlwaysSelectNode is not set and toMultiSelect is set in TreeOption.SelectionOptions. Tested wit latest source. In other cases simply call ClearSelection(): procedure TVisibilityForm.VST2MouseUp(Sender: TObject; Button: TMouseButton; Shift: TShiftState; X, Y: Integer); begin if TBaseVirtualTree(Sender).GetNodeAt(Point(X, Y)) = nil then TBaseVirtualTree(Sender).ClearSelection(); end;