gwt : drag n drop tree

I need a tree 开发者_JAVA百科drag n drop component...but this component does not appear in gwt samples...

I do not understand if Vaadin, under LGPL licence mean that I will need to pay for my 'commercial' application ?

Can I develop my own drag n drop tree component in GWT (is it complex) ?

Tkx

---

In GWT 2.4 there will be drag and drop support I think. With this new feature you can add drag and drop support to almost every widget. Right now 2.4 is in bèta. At Google I/O there was a sessions about GWT and drag and drop. You can watch it here: http://www.youtube.com/watch?v=KEkR1ox_K10

---

Take a look a the dnd plugin of gwtquery. http://code.google.com/p/gwtquery-plugins/wiki/DragAndDropPluginForGWTDeveloppers You will found a example with a dnd tree.

---

You can use gwt-dnd to implement drag-and-drop in ordinary gwt Tree. This should be easy, all you need is provided by gwt-dnd and gwt Tree, just wire things together and add some logic (what can be dragged, how should it look, where can it be dropped and what happens then and so on).