CODEWITHSUNDEEP
gwtdrag-and-drop
Marat
Marat

Reputation: 35

drop widget beyond the AbsolutePanel gwt dnd

I'm trying to drop my draggable widgets out of the boundary panel (AbsolutePanel). In my case draggable widgets is an image. And I want to drop it, so that there will be visible only a part of the image, but when I drop it, and some parts of image beyond absolute panel, it drop automatically within absolute panel. I tried :

dragController.setBehaviorConstrainedToBoundaryPanel(false);

and thought it means that I can drop it where ever I want, but it doesn't work.

Upvotes: 0

Views: 265

Answers (1)

Dipak
Dipak

Reputation: 6950

And the working solution :) Here is my code:

public class myEntripointClass implement EntryPOint{
    AbsolutePanel droper;
    public void onModuleLoad() {
        Panel main = new AbsolutePanel();
        droper = new AbsolutePanel();
        droper.setHeight("300px");
        droper.setWidth("500px");
        main.add(droper);
        content=new AbsolutePanel();
        bt = new Button("Drag and drop it");
        content.add(bt);
        lb = new Label("Label drag and drop");
        content.add(lb);            
        main.add(content);
        manageDnD();
        RootPanel.get().add(main);
    }

    private void manageDnD() {
        PickupDragController dragController = new PickupDragController(
                (AbsolutePanel) content, true);
        dragController.makeDraggable(bt);
        dragController.makeDraggable(lb);
        dragController.addDragHandler(new DragHandler() {

            @Override
            public void onPreviewDragStart(DragStartEvent event)
                    throws VetoDragException {}

            @Override
            public void onPreviewDragEnd(DragEndEvent event) throws VetoDragException {}

            @Override
            public void onDragStart(DragStartEvent event) { 
            }
            @Override
            public void onDragEnd(DragEndEvent event) {
                // TODO Auto-generated method stub
                DragContext context = event.getContext();
                int x=context.mouseX;
                int y= context.mouseY;
                droper.add(context.selectedWidgets.get(0),x,y);
            }
        });
        NameDropController dropController = new NameDropController(droper);
        dragController.registerDropController(dropController);
        dragController.setBehaviorDragProxy(true);
    }

and my DropController class is:

public class NameDropController extends AbstractDropController{
    public NameDropController(Widget dropTarget) {
        super(dropTarget);
    }
    @Override
    public void onDrop(DragContext context) {
        int x=getDiff(getDropTarget().getAbsoluteLeft(), context.mouseX);
        int y=getDiff(getDropTarget().getAbsoluteTop(), context.mouseY);
        ((AbsolutePanel)getDropTarget()).add(context.selectedWidgets.get(0),x,y);
        System.out.print("("+context.mouseX+"::,::"+context.mouseY+")");
      }

    @Override
    public void onMove(DragContext context){
    }

    private int getDiff(int val1,int val2){
        return Math.abs(val1-val2);
    }
}

Upvotes: 1

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