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can't remove widget from parent after parent's detach/attach operation

It's an inventory system. The inventory bar is draggable.

The layout is like this:

 main_panel(hud)
     inventory_bar(user widget)
         (some wraps)
             grid_panel
                 inventory_slot(user widget)

goal: to remove inventory_slot from parent(grid_panel)

It works without dragging, but after inventory_bar being dragged, it fails. I have tried "remove from parent" and "remove child", both failed.

dragging process:

  1. drag inventory_bar detected

  2. create drag

  3. remove inventory_bar from parent(main_panel)

  4. drop to main_panel

  5. main_panel add_child_to_canvas(inventory_bar)


The whole inventory_bar is dragged and dropped perfectly, but inventory_slot can't be removed after dragging.

The parent-child relationship is maintained well. I can print out inventory_slot's parent(grid_panel) but can't remove the slot from it.

I think the culprit is #3/#5. but why?

Thanks!

Product Version: UE 4.12 Preview
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asked May 19 '16 at 03:56 PM in Blueprint Scripting

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raidercodebear
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