如何在GWT中实现拖放

Question

I'm looking in this tutorial GWT DND

I want this Demo 5 to implement in my project, but I am confused as to how to implement it, as there are different classes for the source code:

Source code: InsertPanelExample.java, VerticalPanelDropController.java, VerticalPanelWithSpacer.java, HorizontalPanelDropController.java, PickupDragController.java)

Do we need to take all these around 5 source codes to implement this functionality, and how do we merge these different codes?

Answer 1

The source code of the demo can be found here
But if i were you I would write my own library elevating from it.