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Question TreeView in custom editor drag and drop to Inspector

Discussion in 'Immediate Mode GUI (IMGUI)' started by Monetai, Jun 2, 2020.

  1. Monetai

    Monetai

    Joined:
    Sep 18, 2015
    Posts:
    4
    Hello!

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

    Screenshot_1.png

    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!!
     
  2. DeepShade

    DeepShade

    Joined:
    Apr 10, 2018
    Posts:
    8
    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.         }
     
  3. avi8111

    avi8111

    Joined:
    Sep 2, 2019
    Posts:
    2
    geate. the answer above is what I need. well done
     
  4. Nexer8

    Nexer8

    Joined:
    Dec 10, 2017
    Posts:
    271
    What did you use for k_GenericDragID? Anything special that needs to go there? Asking because the link no longer works.
     
  5. masterton

    masterton

    Joined:
    Dec 11, 2012
    Posts:
    41
    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";