Configuring the first and last element in the list

[meatloaf1024]

I'm currently running up against an issue trying to configure the first and last element of the scroller.

At first my thought was to do this in GetCellView with something like the following oc



       public EnhancedScrollerCellView GetCellView(EnhancedScroller scroller, int dataIndex, int cellIndex)

       {

           var friendUiItem = scroller.GetCellView(friendUiItemPrefab) as FriendUIItem;

           friendUiItem.name = "Friend UI Item " + dataIndex;



           var entry = friendListEntries[dataIndex];



           //convert the data index to a list position so we can configure our ui Item appropriately

           var listPosition = dataIndex switch

           {

               var x when x == scroller.StartDataIndex && x == scroller.EndDataIndex => FriendUIItem.ListPosition.Solo,

               var x when x == scroller.StartDataIndex => FriendUIItem.ListPosition.First,

               var x when x == scroller.EndDataIndex => FriendUIItem.ListPosition.Last,

               _ => FriendUIItem.ListPosition.Middle

           };

           

           friendUiItem.Configure(entry,playFabFriendsListService,friendsCanvasController,listPosition);

           

           friendUiItem.buttonGroupEventNotifier.OnButtonGroupSelectionEntered += (button) =>

           {

               OnRowSelectionAttempted?.Invoke(friendUiItem,button.gameObject,true);

           };



           return friendUiItem;

       }
But the list isn't fully created yet, so the EndDataIndex and StartDataIndex are incorrect as GetCellView is called initially. 

One way I've thought of fixing this is waiting one frame after ReloadData() is called and traversing the list. In general though I'm curious if there are any best practices for this?

Thanks in advance?

[echo17]

EnhancedScroller is an MVC solution (Model - View - Controller). What that means is that the controller doesn't need to know anything about the view. The controller interacts directly with the data (the model), which then drives the view. I'm not really sure what is going on in your code above, but it looks like you are trying to manage the view directly from the controller.

I would advise against this. Instead, you can update the data in your controller, and then the data can influence the view. I'm not sure what your overall goal is, but if you could explain that I might be able to offer a solution.

[meatloaf1024]

Yeah I do understand the principle of MVC however I wasn't quite sure how to approach the following scenario. The issue I am having is that I need to ensure focused / selected button elements in my list item are able to navigate down to other buttons in the list item below it.

Given that things are dynamically loaded I struggled to figure out the best way to configure this behavior.

[echo17]

Sorry, I'm still not understanding what the overall goal is. If you could lay out a complete interaction workflow, with the steps a user takes and what you expect to happen when they do, I might be able to advise on the best approach.