Drag item from custom DockPane and Drop on a Map

[JaneDoe]

Hi

Can anyone provide a sample on how to handle the Drop event of a custom item (not a file) on a Map or Scene?

The Drag operation is initiated on the TreeView of a custom DockPane as specified in ProConcepts Framework · Esri/arcgis-pro-sdk Wiki · GitHub and seems to work just fine. That is, StartDrag() is called on dragging a TreeViewItem and the cursor receives the 'not droppable' effect, which is probably ok since the Drop target has not yet been defined.

public void StartDrag(DragInfo dragInfo)
{
    dragInfo.Data = "SELECTED LAYER...";
    dragInfo.Effects = DragDropEffects.Move;
}

Custom Drop handlers for files (with the specified extensions) can be defined in DAML (https://github.com/esri/arcgis-pro-sdk/wiki/ProConcepts-Framework#custom-drop-handlers-in-daml😞

<insertHandler id="DragDropExample_ExcelDropHandler" className="ExcelDropHandler" dataTypes=".XLSX|.xlsx|.XLS|.xls" />

I couldn't find a way though to employ them for the Drop of a custom item. Is there another way to make the Map a Drop target for my TreeViewItem?

Thanks!

[UmaHarano]

Hi Monika

To drag and drop a custom item, implement the IMappableItem interface  

You will have to implement the following 2 methods on your custom item:

1. CanAddToMap Method: Return true here to allow the items to be dropped on a Map or Scene.

2. OnAddToMap method: This is where you add your logic that allows you to display your item in the map. It could be where you load your plugin, or run a GP tool, etc.

The Custom item guide and samples will be updated with this info when Pro 2.5 is released next week.

Thanks!

Uma

[JaneDoe]

Thanks for your reply!

Didn't get the IMappableItem option to run (no sample found), but the following sample shows another option to achieve the same result (point 11. - drag from TreeView and drop to Map):

arcgis-pro-sdk-community-samples/Framework/DragAndDrop at master · Esri/arcgis-pro-sdk-community-sam... 

Populating the ItemInfoValue object with the Item information provided by ItemFactory.Instance.Create() makes the cursor receive the 'droppable' effect when over a Map or Scene.