Use gwt-dnd with StackLayoutPanel

[Anna Wałach]

Hello,

Lately, I started playing with dnd and new GWT layout panels 2.0. I wanted to use StackLayoutPanel(http://www.gwtproject.org/doc/latest/DevGuideUiPanels.html) to display headers and some child widgets(HTML text).

I want to use dnd to change the header order (similar functionality like in Demo 6 with FlexTable). I tried to follow advices from the Demo 6 and I designed my own drag and drop controllers, but I'm stuck with the drop controller. I wanted to extend AbsolutePositionDropController, but in constructor:

public StackLayoutHeaderDropController(StackLayoutPanel stackPanel) {

    super(stackPanel);

    this.stackPanel = stackPanel;

}

It says I cant call the super constructor with a Layout Panel. 

I want to ask what is the proper schema for dealing with Layout Panels drag-and-drop for inner widgets' order changes?

Cheers,

Anna