Examples of com.vaadin.event.dd.acceptcriteria.AcceptCriterion

com.vaadin.event.dd.acceptcriteria.AcceptCriterion

Criterion that can be used create policy to accept/discard dragged content (presented by {@link Transferable}). The drag and drop mechanism will verify the criteria returned by {@link DropHandler#getAcceptCriterion()} before calling{@link DropHandler#drop(DragAndDropEvent)}. The criteria can be evaluated either on the client (browser - see {@link ClientSideCriterion}) or on the server (see {@link ServerSideCriterion}). If no constraints are needed, an {@link AcceptAll} can be used.In addition to accepting or rejecting a possible drop, criteria can provide additional hints for client side painting. @see DropHandler @see ClientSideCriterion @see ServerSideCriterion @since 6.3

        label.setSizeUndefined();
        pane1.addComponent(label);


        DragDropPane pane2 = new DragDropPane();
        pane2.setCaption("Pane2 (accept needs server side visit, check for \"Bar\")");
        final AcceptCriterion crit = new ServerSideCriterion() {
            /**
             * 
             */
            private static final long serialVersionUID = 1L;

         * 
         * Example is pretty stupid (accepts drop on all nodes, but by
         * explicitly defining them here), but demonstrates lazy initialization
         * option if rules are heavy.
         */
        final AcceptCriterion crit = new Tree.TreeDropCriterion() {


            @Override
            protected Set<Object> getAllowedItemIds(DragAndDropEvent dragEvent,
                    Tree tree) {
                return new HashSet<Object>(tree.getItemIds());

Examples of com.vaadin.event.dd.acceptcriteria.AcceptCriterion

Related Classes of com.vaadin.event.dd.acceptcriteria.AcceptCriterion