Drag & Drop treeview

[retorquere]

Can someone help me to get this: http://stackoverflow.com/questions/11242847/is-drag-and-drop-supported-by-treeitem implemented using jrubyFX? I've got the tree working, which was simple, but the drag and drop bits use a callback mechanism which I'm not sure how to translate into jrubyfx.

[enebo]

I would try something like this:

class MyTreeCell < TreeCell
  def updateItem(item, empty)
    super(item, empty)
    text = item unless item
  end
end

#...in scenebuilding part of your code.
tree_view do
  set_cell_factory do
    MyTreeCell.new.tap do |tree_cell|
      tree_cell.set_on_drag_detected do |mouse_event|
        # ...
      end
    end
  end
end

[retorquere]

I've tried this (https://gist.github.com/4678888), but that makes the textx not render, and I see no sign of dnd. I've found a more compicated (but more complete) sample of tree drag and drop in java. I'll see if I can make that work; do you want a pull request for a working sample if I do?

[retorquere]

I've tried to translate https://gist.github.com/4009620 to jrubyfx, but I keep tripping up on the event handler stuff. Any general pointers on how to approach this?

[enebo]

I made a couple of tweaks to get (https://gist.github.com/4678888) working. I am unclear why MyTreeCell's super does not render the contents directly. It still seems like you want the method for updateItem I provided though (reversed unless to if and did self.text so we used text= method and not local variable text).

You will also notice I changed how tree_view and tree_item setup. This only works on master. After you reported this issue I decided to play with tree_view + tree_items and made some changes to have them behave more like the rest of the DSL.

FWIW, I don't know if set_on_drag_detected is all you need to do or not but I can see that method firing when I try to drag something. It just doesn't actually show any graphics of something being dragged...

[enebo]

Look at this sample:

https://github.com/nahi/jrubyfx/blob/master/samples/javafx/tree_view.rb

It basically implements reasonable drag and drop support. The code you had used was partially dependent on other classes in a framework. This code is not quite the same since I changed some behavior and I think fixed several corner cases. This was surprisingly tedious but I wanted to include a more sophisticated example.

I am resolving this issue because this example should show more than enough examples of how to work with Java classes and define event handlers.

[retorquere]

Splendid! Still requires master, right? No probs, loving this!