LayoutView.on_selection_changed behavior

Comments

• Matthias

  January 2021

  Hi Eugene,

  thanks for reporting this. I'll verify that and create a ticket if necessary. I recall I have seen this issue myself, but I'm not sure. Maybe it's already fixed in master.

  Matthias
• EugeneZelenko

  January 2021

  Hi, Matthias!

  I tried 0.26.9 and I was not correct in original problem description. LayoutView.on_selection_changed is called when object(s) is/are unselected, but LayoutView.has_object_selection is still True

  Test code:

  import pya
  
  main_window = pya.Application.instance().main_window()
  current_view = main_window.current_view()
  
  def on_selection_changed(main_window, current_view):
     count = 0
     for selected_object in current_view.each_object_selected():
        count += 1
     if current_view.has_object_selection:
        main_window.message('Select {0}'.format(count), 2000)
     else:
        main_window.message('Unselect', 2000)
  
  current_view.on_selection_changed = \
     lambda __main_window=main_window, __current_view=current_view: \
     on_selection_changed(__main_window, __current_view)
  
• Matthias

  January 2021

  @EugeneZelenko thanks a lot for the code!

  The problem still persists on master. As a workaround I'd suggest to check for "view.each_object_selected().size == 0". But of course "has_object_selection" should work.

  I have created a ticket for this: https://github.com/KLayout/klayout/issues/703

  I hope it's easy to fix.

  Thanks,

  Matthias
• EugeneZelenko

  January 2021

  Hi, Matthias!

  Thank you for help!

  As workaround I use early return from current_view.each_object_selected() loop in on_selection_changed handler when object is selected, and code handling no objects selected situation is located after loop.

  Eugene.