Example usage for org.apache.wicket.extensions.markup.html.repeater.tree DefaultNestedTree DefaultNestedTree

Introduction

In this page you can find the example usage for org.apache.wicket.extensions.markup.html.repeater.tree DefaultNestedTree DefaultNestedTree.

Prototype

public DefaultNestedTree(String id, ITreeProvider<T> provider) 

Source Link

Document

Construct.

Usage

From source file:wicketdnd.examples.TreeExample.java

License:Apache License

public TreeExample(String id) {
    super(id);/*from  w  w  w  . j  ava  2  s  . c om*/

    final FooTreeProvider provider = new FooTreeProvider();
    final NestedTree<Foo> tree = new DefaultNestedTree<Foo>("tree", provider) {
        @Override
        protected Component newContentComponent(String arg0, IModel<Foo> arg1) {
            Component component = super.newContentComponent(arg0, arg1);
            component.setOutputMarkupId(true);
            return component;
        }
    };
    tree.add(new DragSource() {
        @Override
        public Set<Operation> getOperations() {
            return dragOperations();
        }

        @Override
        public String[] getTypes() {
            return types();
        }

        @Override
        public void onAfterDrop(AjaxRequestTarget target, Transfer transfer) {
            if (transfer.getOperation() == Operation.MOVE) {
                Foo foo = transfer.getData();

                provider.remove(foo);

                foo.remove();

                target.add(tree);
            }
        }
    }.drag("span.tree-content"));
    tree.add(new DropTarget() {
        @Override
        public Set<Operation> getOperations() {
            return dropOperations();
        }

        @Override
        public String[] getTypes() {
            return types();
        }

        @Override
        public void onDrag(AjaxRequestTarget target, Location location) {
            if (location.getComponent() != tree) {
                Foo foo = location.getModelObject();
                if (tree.getState(foo) == State.COLLAPSED) {
                    tree.expand(foo);
                }
            }
        }

        @Override
        public void onDrop(AjaxRequestTarget target, Transfer transfer, Location location) throws Reject {
            if (location.getComponent() == tree) {
                provider.add(operate(transfer));
            } else {
                Foo foo = location.getModelObject();
                if (foo.isAncestor(transfer.getData())) {
                    transfer.reject();
                }

                switch (location.getAnchor()) {
                case CENTER:
                    if (foo == transfer.getData()) {
                        transfer.reject();
                    }
                    provider.add(operate(transfer), foo);

                    tree.expand(foo);
                    break;
                case TOP:
                    provider.addBefore(operate(transfer), foo);
                    break;
                case BOTTOM:
                    provider.addAfter(operate(transfer), foo);
                    break;
                default:
                    transfer.reject();
                }
            }
            target.add(tree);
        }
    }.dropCenter("span.tree-content, div.treeContainer").dropTopAndBottom("div.tree-branch"));
    tree.setOutputMarkupId(true);
    content.add(tree);
}

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