Change itemsSource of listview in runtime

Unity Engine
,
1

Hi, I’ve been struggling with a bug in my code that i don’t understand. i have the following:

2 gameObjects, when i right click on a gameObject it will Display flex a VisualElement containing a ListView. This Listview is also populated with data like so:

    public void InitializeInteractionMenu(VisualElement root, VisualTreeAsset interactionButtonTemplate, List<InteractionMenuItem> items, Vector2 position)
    {
        // Store a reference to the template for the list entries
        InteractionButtonTemplate = interactionButtonTemplate;

        // Store a reference to the character list element
        interactionMenu = root.Q<ListView>("interaction-menu");
        VisualElement mainContainer = root.Q<VisualElement>("main-container");

        mainContainer.style.position = Position.Absolute;
        mainContainer.style.left = position.x + menuOffset;
        mainContainer.style.bottom = position.y + menuOffset;
        mainContainer.style.display = DisplayStyle.Flex;

        fillInteractionList(items);
    }
   
    void fillInteractionList(List<InteractionMenuItem> items)
    {
        // Set up a make item function for a list entry
        interactionMenu.makeItem = () =>
        {
            // Instantiate the UXML template for the entry
            var newListEntry = InteractionButtonTemplate.Instantiate();

            // Instantiate a controller for the data
            var newListEntryLogic = new InteractionMenuButtonController();

            // Assign the controller script to the visual element
            newListEntry.userData = newListEntryLogic;

            // Initialize the controller script
            newListEntryLogic.SetVisualElement(newListEntry);

            // Return the root of the instantiated visual tree
            return newListEntry;
        };

        // Set up bind function for a specific list entry
        interactionMenu.bindItem = (item, index) =>
        {
            (item.userData as InteractionMenuButtonController).SetInteractionMenuItem(items[index]);
        };

        // Set a fixed item height
        interactionMenu.fixedItemHeight = 45;

        // Set the actual item's source list/array
        interactionMenu.itemsSource = items;
    }

When clicking the other gameObject an entirely different set of options may be displayed. I figured calling the same logic with a different set of InteractionMenuItem would do the trick. However it seems like the bindItem logica is being called with the oldset of data. Which causes a index out of range error for items[index].

The part where im really lost is, with my current logic i display none the visual element again if no gameObject (or no interactable gameObject is selected). If i do that between switching from gameObject 1 to 2 all is fine. However triggering the same logic just before i repopulate the list does not have the same effect (and i would consider it a dirty workaround)

There must be something im not getting.

2

listview.itemSource = myItemSource;
then Rebuild after to propagate all items in that new itemSource

3

Thanks for answering, i’ve had toi make one additional change which was to clear the itemsSource first. otherwise it would still throw the index error

4

Can you show code?