TreePanel DND without removing node

[bjornj]

Hi, just started to play with ext gwt, quite fun.

I have a probably very simple question about dnd:
I'm trying to make a drag'n'drop work from a TreePanel (to a TreeGrid).
It works nice except that the nodes being dragged from the source
are removed (which is normal in most cases). However I'd like them
to stay since I use the tree as a 'palette' of actions.
I'm assuming there is som simple setting to perform this, but am unable
to find it. any tips?

Thanks a lot // Bjorn

[g1_]

Define the dropTarget like so:

        DropTarget target = new DropTarget(xxx) {  
            @Override  
            protected void onDragDrop(DNDEvent event) {  
                Info.display("MessageBox", "DND event occured");
            }  
        }; 
        target.setOperation(Operation.COPY) ;

ie. the setOperation method should be used.
note you'll have to import com.extjs.gxt.ui.client.dnd.DND.Operation ;

[bjornj]

Works perfectly! Thanks for the answer, I didn't see
this option before.

[The_Jackal]

You can also handle this at the source level if you want all targets not to remove items by overriding the TreePanelDragSource.onDragDrop

TreePanelDragSource source = new TreePanelDragSource(treePanel) {
    @Override
    protected void onDragDrop(DNDEvent event) {
        // Do nothing on drop - prevents removal of tree items
    }
}

[vinaysu]

Hi All,

I am new to GXT and in application i am using DragSource and DropTarget classes.

by default Operation.MOVE is set while DragNDrop but i have set Operation.COPY in DropTarget but its not working as COPY still its removing the source from DragSource

please find the code below:

DragSource source = new DragSource(html) {
@Override
protected void onDragStart(DNDEvent event) {
event.setData(html);
event.getStatus().update(El.fly(html.getElement()).cloneNode(true));
Info.display("DragSource", "Dragging kpis"+event.getOperation());
}
};
source.setGroup("Library");


******

DropTarget target = new DropTarget(center) {
@Override
protected void onDragDrop(DNDEvent event) {
super.onDragDrop(event);
Html html = event.getData();
Info.display("DropTarget", "Dropping kpis"+event.getOperation());
center.add(html);
}
};
target.setOperation(Operation.COPY);
target.setGroup("Library");
target.setOverStyle("drag-ok");

here "center" is ContentPanel

please reply................