How to know if user really clicked an option in a LISTVIEW_KIND gadget?

[Sim085]

The size of a LISTVIEW_KIND gadget can be more than the number of options this has. When clicking on a LISTVIEW_KIND area but not an option, the last option gets selected (highlighted).


In the screenshot above, when the mouse is clicked on the blank area of the LISTVIEW_KIND, the index of the last option is printed in the console in the background even though this option was not clicked.

At the moment I listen for click events on the LISTVIEW_KIND gadget as follows:

msg = (struct IntuiMessage *)GT_GetIMsg(window->UserPort);
msgClass = msg->Class;
if(msgClass == IDCMP_GADGETUP)
{
   case MY_LIST:
   {

      unsigned long selected;
      GT_GetGadgetAttrs(gad_mylist, window, NULL, 
         GTLV_Selected, &selected,
         TAG_END);
      printf("%lu\n", selected);

   }

}

Is there a way how I can listen for a mouse click only when an option is clicked?

[leeg]

I've noticed that issue on our stream https://dosamigans.com, but never done anything about it. I expect you could set the GACT_FOLLOWMOUSE flag for the gadget and peek the mouse coordinates to decide whether it's over an item.

[Minuous]

I could fix it for the next update of AmigaOS, if it has not been already. The desired behaviour in this case is for the gadget to intercept the click but ignore it, right?

[Sim085]

Originally Posted by leeg

I've noticed that issue on our stream https://dosamigans.com, but never done anything about it. I expect you could set the GACT_FOLLOWMOUSE flag for the gadget and peek the mouse coordinates to decide whether it's over an item.

Thank you, will try that out.

Originally Posted by Minuous

I could fix it for the next update of AmigaOS, if it has not been already. The desired behaviour in this case is for the gadget to intercept the click but ignore it, right?

My C programming / experience is very basic, so would not know what is best. However, when I was writing the code I was expecting GTLV_Selected would return null when clicking on a non-option.

[Minuous]

OK, fixed for BB1.

[leeg]

Presumably ~0, rather than null, otherwise you can't tell selected item 0 from clicked outside

[Minuous]

Yes, ~0.