Question Add/Remove items from Listview content (editor)

Hey !

I was wondering about the best solution to make a custom array/list field with a custom object selector.

For now i made a custom UIElement extending ListView. I then added a add button, displaying my custom selector. From my Add button, I have an object reference that I need to add to my array. Now I need to update my serializedproperty array with this new value, and propagate the change to my UIElement. How can I access the bound serialized array from inside my custom UIElement in order to modify it ?

 

Maybe I should explain my problem better !

I want to do a reusable UIElement which I can drag n drop using UI builder.

It's basically a ListView with few more buttons so I decided to inherit from ListView because why not :

Code (CSharp):

1. public class CustomListField : ListView
2. {
3.     public new class UxmlFactory : UxmlFactory<CustomListField , UxmlTraits> { }
4.     public CustomListField () : base(){
5.  
6.         ...
7.         var btn_add = new Button();
8.         btn_add.Add(new Label("Add ..."));
9.  
10.         btn_add.RegisterCallback<ClickEvent>(OpenPopup);
11.  
12.         hierarchy.Add(btn_add);
13.     }
14.  
15.     void OpenPopup(ClickEvent evt)
16.     {
17.         var e = (VisualElement)evt.currentTarget;
18.         // This popup show a list of elements and returns the selected element using a callback
19.         CustomDropdown.Open<CustomData>((VisualElement)evt.currentTarget, (data) => {
20.  
21.             // Dont know how I'm supposed to update the array collection from here.
22.             // I would like to be able to add/remove items
23.         }, false,null);
24.     }
25. }

I then use the bindingPath property in Uxml to bind it with my CustomData list

Here's the result visually
(a custom dropdown open when clicking add button)


It works but I have no clue on how I'm supposed to modify the serialized array collection size from inside my class if I want to insert a new element. I'm really stuck in this one !

 

Still stuck infortunately ! Should I make a propertydrawer for my list instead ?