Examples of com.vaadin.ui.Tree$TreeDropCriterion

com.vaadin.ui.Tree
Lazy loading accept criterion for Tree. Accepted target nodes are loaded from server once per drag and drop operation. Developer must override one method that decides accepted tree nodes for the whole Tree.
Initially pretty much no data is sent to client. On first required criterion check (per drag request) the client side data structure is initialized from server and no subsequent requests requests are needed during that drag and drop operation.

    }


    @Override
    protected void setup() {
        setTheme("runo");
        Tree tree = new Tree();
        tree.setWidth("100px");


        tree.addItem("1");
        tree.setItemIcon("1", new ThemeResource("../runo/icons/16/ok.png"));


        String mainItem = "A very long item that should not wrap";
        String subItem = "Subitem - also long";


        tree.addItem(mainItem);
        tree.setItemIcon(mainItem, new ThemeResource(
                "../runo/icons/16/error.png"));


        tree.addItem(subItem);
        tree.setParent(subItem, mainItem);


        tree.expandItem("1");
        tree.expandItem(mainItem);
        tree.expandItem(subItem);


        addComponent(tree);
    }

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                "../runo/icons/64/folder.png?" + new Date().getTime());
        ThemeResource notCachedFolderIconLarge = new ThemeResource(
                "../runo/icons/32/folder.png?" + new Date().getTime());
        ThemeResource notCachedFolderIconLargeOther = new ThemeResource(
                "../runo/icons/32/ok.png?" + new Date().getTime());
        Tree t = new Tree();
        t.setImmediate(true);


        t.addItem("Root 1");
        t.addItem("Root 11");
        t.addItem("Root 111");
        t.addItem("Root 1111");
        t.addItem("Sub 1");
        t.setItemIcon("Sub 1", notCachedFolderIconLargeOther);
        t.setParent("Sub 1", "Root 1");
        String longItemId = LoremIpsum.get(50);
        t.addItem(longItemId);
        t.setItemIcon(longItemId, notCachedFolderIconHuge);
        t.setParent(longItemId, "Root 11");
        t.addItem("abcdefghijklmn");


        String first = "abcdefghijklmnop";
        String second = "abcdefghijklmnopqrst";
        t.addItem(first);
        t.addItem(second);
        t.setParent(second, first);
        t.setItemIcon(first, notCachedFolderIconLarge);


        HorizontalLayout hlay = new HorizontalLayout();
        hlay.setStyleName(Reindeer.LAYOUT_BLUE);
        hlay.addComponent(t);
        hlay.setWidth(-1, Sizeable.UNITS_PIXELS);

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        HorizontalLayout row = new HorizontalLayout();
        row.addStyleName("wrapping");
        row.setSpacing(true);
        addComponent(row);


        Tree tree = new Tree();
        tree.setSelectable(true);
        tree.setMultiSelect(true);
        Container generateContainer = ValoThemeUI.generateContainer(10, true);
        tree.setContainerDataSource(generateContainer);
        tree.setDragMode(TreeDragMode.NODE);
        row.addComponent(tree);
        tree.setItemCaptionPropertyId(ValoThemeUI.CAPTION_PROPERTY);
        tree.setItemIconPropertyId(ValoThemeUI.ICON_PROPERTY);
        tree.expandItem(generateContainer.getItemIds().iterator().next());


        tree.setDropHandler(new DropHandler() {
            @Override
            public AcceptCriterion getAcceptCriterion() {
                return AcceptAll.get();
            }


            @Override
            public void drop(DragAndDropEvent event) {
                Notification.show(event.getTransferable().toString());
            }
        });


        // Add actions (context menu)
        tree.addActionHandler(ValoThemeUI.getActionHandler());
    }

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        return c;
    }


    /** Create new Tree and add it to current component container. */
    public Tree tree() {
        Tree c = new Tree();
        c.setImmediate(true);
        add(c);
        return c;
    }

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    /**
     * Create new Tree with given caption and add it to current component
     * container.
     */
    public Tree tree(String caption) {
        Tree c = tree();
        c.setCaption(caption);
        return c;
    }

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        return c;
    }


    /** Create new Tree with given caption and listener. */
    public Tree tree(String caption, Property.ValueChangeListener changeListener) {
        Tree c = tree(caption);
        c.addListener(changeListener);
        return c;
    }

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  public Component getView(Application application) {
    if (view == null) {
      VerticalLayout verticalLayout = new VerticalLayout();
      verticalLayout.setMargin(true);


      tree = new Tree("Compamies and Employees");
      verticalLayout.addComponent(tree);
      synchronized (this) {
        if (personManager != null) {
          refreshTree();
        }

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  private static final long serialVersionUID = 1L;


  @Override
  protected AbstractSelect createSelectComponent() {
    Tree tree = createTree();
    tree.setSizeFull();
    return tree;
  }

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      String buttonId = QueuesPanelRefresherUtil.getSubstitutedRootNodeId(substitutedUser.getLogin());
      
      container.getItem(substAssignedTasks).getItemProperty("debugId").setValue(buttonId);
    }


    final Tree substitutionsTree = getSubstitutionsTree();
    substitutionsTree.setContainerDataSource(container);
    VerticalLayout vl = new VerticalLayout();
    vl.setMargin(false);
    vl.setSpacing(false);
    vl.addComponent(substitutionsTree);
    substitutionsPanel.setContent(vl);

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  {
    if(substitutionsTree != null)
    {
      return substitutionsTree;
    }
    substitutionsTree = new Tree();
    substitutionsTree.setItemCaptionPropertyId("name");
    substitutionsTree.setSelectable(false);
    substitutionsTree.setItemStyleGenerator(new ItemStyleGenerator()
    {
      @Override

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