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.

    private NavigationPanelListener listener;


    private final Tree tree;


    public NavigationPanelView() {
        tree = new Tree();
    }

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        VerticalLayout pl = new VerticalLayout();
        pl.setMargin(true);
        Panel p = new Panel("Tree test", pl);
        p.setSizeFull();


        Tree t = new Tree();


        t.addItem("Foo");
        t.addItem("Bar");


        final VerticalLayout events = new VerticalLayout();


        t.addListener(new ItemClickEvent.ItemClickListener() {
            @Override
            public void itemClick(ItemClickEvent event) {
                events.addComponent(new Label(new Label("Click:"
                        + (event.isDoubleClick() ? "double" : "single")
                        + " button:" + event.getButtonName() + " propertyId:"

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        return new Label("<b>Components without a test:</B><br/>"
                + missingTests, ContentMode.HTML);
    }


    private Component createMenu() {
        naviTree = new Tree();
        naviTree.setItemStyleGenerator(new ItemStyleGenerator() {


            @Override
            public String getStyle(Tree source, Object itemId) {
                Class<?> cls = (Class<?>) itemId;

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        smi = mi.addItem("Item", icon, null);
        smi = smi.addItem("Item", icon, null);
        gl.addComponent(menu);


        // Tree, caption + item + subitem + action icons
        Tree tree = new Tree("Tree");
        tree.addItem("Root");
        tree.setItemIcon("Root", icon);
        tree.addItem("Leaf");
        tree.setItemIcon("Leaf", icon);
        tree.setParent("Leaf", "Root");
        tree.expandItemsRecursively("Root");
        tree.addActionHandler(actionHandler);
        gl.addComponent(tree);


        // All of FontAwesome
        String allIcons = "";
        for (FontIcon ic : FontAwesome.values()) {

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        main.addComponent(new Label(
                "Some test cases for trees. Events panel logs events that happen server side."));


        main.addComponent(new Button("commit"));


        Tree t;


        t = createTestTree();
        t.setCaption("Default settings");
        main.addComponent(createTestBench(t));


        t = createTestTree();
        t.setCaption("Multiselect settings");
        t.setMultiSelect(true);
        main.addComponent(createTestBench(t));


        t = createTestTree();
        t.setCaption("Multiselect and immediate");
        t.setImmediate(true);
        t.setMultiSelect(true);
        main.addComponent(createTestBench(t));


        t = createTestTree();
        t.setCaption("immediate");
        t.setImmediate(true);
        main.addComponent(createTestBench(t));


        t = createTestTree();
        t.setCaption("with actions");
        t.setImmediate(true);
        t.addActionHandler(this);
        final AbstractOrderedLayout ol = (AbstractOrderedLayout) createTestBench(t);
        al = new VerticalLayout();
        al.setMargin(true);
        ol.addComponent(new Panel("action log", al));
        main.addComponent(ol);

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        main.addComponent(b);


    }


    public Tree createTestTree() {
        Tree t = new Tree("Tree");
        final String[] names = new String[100];
        for (int i = 0; i < names.length; i++) {
            names[i] = firstnames[(int) (Math.random() * (firstnames.length - 1))]
                    + " "
                    + lastnames[(int) (Math.random() * (lastnames.length - 1))];
        }


        // Create tree
        t = new Tree("Organization Structure");
        for (int i = 0; i < 100; i++) {
            t.addItem(names[i]);
            final String parent = names[(int) (Math.random() * (names.length - 1))];
            if (t.containsId(parent)) {
                t.setParent(names[i], parent);
            }
        }


        // Forbid childless people to have children (makes them leaves)
        for (int i = 0; i < 100; i++) {
            if (!t.hasChildren(names[i])) {
                t.setChildrenAllowed(names[i], false);
            }
        }
        return t;
    }

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        // setting either width or height fixes the issue
        // p.setWidth(500);
        // p.setHeight(800);


        // Tree with a few items
        tree = new Tree();
        tree.setImmediate(true);
        // we'll use a property for caption instead of the item id ("value"),
        // so that multiple items can have the same caption
        tree.addContainerProperty(CAPTION_PROPERTY, String.class, "");
        tree.setItemCaptionMode(AbstractSelect.ITEM_CAPTION_MODE_PROPERTY);

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        populateContainer(hier);


        // sort(indexedContainer);


        tree1 = new Tree("Tree with wrapped IndexedContainer");
        tree1.setContainerDataSource(hier);
        tree1.setItemCaptionPropertyId("name");
        for (Object id : hier.rootItemIds()) {
            tree1.expandItemsRecursively(id);
        }

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            s.addItem(name);
        }
    }


    public Tree createTestTree() {
        Tree t = new Tree("Tree");
        final String[] names = new String[100];
        for (int i = 0; i < names.length; i++) {
            names[i] = firstnames[(int) (Math.random() * (firstnames.length - 1))]
                    + " "
                    + lastnames[(int) (Math.random() * (lastnames.length - 1))];
        }


        // Create tree
        t = new Tree("Organization Structure");
        for (int i = 0; i < 100; i++) {
            t.addItem(names[i]);
            final String parent = names[(int) (Math.random() * (names.length - 1))];
            if (t.containsId(parent)) {
                t.setParent(names[i], parent);
            }
        }


        // Forbid childless people to have children (makes them leaves)
        for (int i = 0; i < 100; i++) {
            if (!t.hasChildren(names[i])) {
                t.setChildrenAllowed(names[i], false);
            }
        }
        return t;
    }

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        tt.setSelectable(true);
        tt.addContainerProperty("foo", String.class, "bar");
        tt.addItem();


        fields.add(tt);
        Tree tree = new Tree();
        tree.addItem("Item 1");
        fields.add(tree);
        fields.add(new TwinColSelect());
        fields.add(new PasswordField());
        fields.add(new TextField());
        fields.add(new TextArea());

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