Sample Control: Dropdown - Add ItemVisualStateChanged event.

[najak3d]

I've modified your code to do this for me, and occurred to me that this should probably be the built-in behavior. It's a little tedious (for someone not familiar with your code), but not a complex thing to do, so I won't paste my own solution here.

As the user hovers over the various Entities on the map in the DropDown list, I want them to highlight ALSO on the map, which requires that I be able to register for the "ItemVisualStateChanged" event, and look for it to change to "Hovered".

Here's the event I added to DropdownVisuals (was the easiest place for me to insert it):

    /// <summary>Fires when VisualState changes.  Args:  Source, NewState, OldState.</summary>
    public event Action<ToggleVisuals, VisualState, VisualState> OptionVisualStateChanged;

[najak3d]

To make this even better, today, I just moved this event (OnItemVisualStateChanged) up to "Dropdown.cs" instead, right alongside "OnItemClicked", and then implemented in a similar fashion, as I should have in the first place.

NOTE - this new event should send BOTH the NewState and PrevState, in the arguments, so that you know the full details of the transition.

A BETTER APPROACH, IMO, is to just add one event:
public UnityEvent<GestureEventTypes, {more}> ItemGestureEvent;
public GestureEventTypes GestureEventsMonitored; // Default to only "Clicked"?

where:
[FLAGS] enum GestureEventTypes { _None = 0, Hover = 1, UnHover = 2, Press = 4, .... }

Then it becomes obvious/butt-simple to register for Item Gesture Events.

If you'd like to save yourself some time, I'd be happy to code this up for you and submit it.