Question TreeView in custom editor drag and drop to Inspector

Hello!

I'm working on an editor that list all assets from a certain type in my project.
It look like that:



I would like to be able to drag the asset in the left tree view to a corresponding variable exposed in the inspector, but I can't find a way to do that.. The thing is I don't really know if I'm using the tree view correctly.. when dragging in the tree view, should I be dragging rows? dragging a reference to the asset itself? What should I put in the DragAndDrop.SetGenericData?
It make a perfect transition to a second question, do you know a good ressource on tree view usage and best practice? I couldn't find any ='(


Thank you for your help!!

 

Hi,
I hope it is not to late, but have you seen the TreeView Example Project? For your specific case you can look for the TreeViewWithTreeModel class:

Code (CSharp):

1.         protected override void SetupDragAndDrop(SetupDragAndDropArgs args)
2.         {
3.             if (hasSearch)
4.                 return;
5.  
6.             DragAndDrop.PrepareStartDrag();
7.             var draggedRows = GetRows().Where(item => args.draggedItemIDs.Contains(item.id)).ToList();
8.             DragAndDrop.SetGenericData(k_GenericDragID, draggedRows);
9.             DragAndDrop.objectReferences = new UnityEngine.Object[] { }; // this IS required for dragging to work
10.             string title = draggedRows.Count == 1 ? draggedRows[0].displayName : "< Multiple >";
11.             DragAndDrop.StartDrag (title);
12.         }

 

geate. the answer above is what I need. well done

 

What did you use for k_GenericDragID? Anything special that needs to go there? Asking because the link no longer works.

 

k_GenericDragId is a string, and you can name it anything. For example, the tree control in the Timeline package has it set as:

Code (CSharp):

1. const string k_GenericDragId = "TimelineDragging";