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  1. TAdvTreeView

Tips and Frequently Asked Questions

 How to change the images for the check boxes and radio buttons


You can change the default drawing by implementing the OnBeforeDrawNodeCheck and then set the allow parameter to False. The default checkbox drawing will be disable, and then you can manually draw a different image, or graphic with the ACanvas parameter, as demonstrated in the sample below: 

procedure TForm1.AdvCheckedTreeView1BeforeDrawNodeCheck(Sender: TObject;
  ACanvas: TCanvas; ARect: TRectF; AColumn: Integer;
  ANode: TAdvTreeViewVirtualNode; var AAllow: Boolean);
begin
  AAllow := False;
  if ANode.Node.Checked[0] then
    // draw checked checkbox
  else
    // draw unchecked checkbox
end;




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